GIT_SILENT Upgrade ECM and KF version requirements for 5.107.0 release.

- 1-bit writer: checks where is black and use NOT operator only if needed
- Fix images with witdh == 65536(*)
- Checks result of disk writes and reads on all formats

(*) PCX formats support images with with of 65536 but only if the header field bytesPerLine is valid (no overflow). This means that the width 65536 is supported on 1bpp images only.
The previous version of the plugins wrote an image with width of 65536px in the wrong way and it was unable to read it (wrong image returned). I verified that Photoshop and Gimp weren't able to read the image either.

(cherry picked from commit d57ff91f8b)

.gitattributes

@@ -0,0 +1 @@
+autotests/read/raw/RAW_KODAK_C330_FORMAT_NONE_YRGB.raw binary

.gitlab-ci.yml

@@ -3,9 +3,12 @@
 
 include:
   - https://invent.kde.org/sysadmin/ci-utilities/raw/master/gitlab-templates/linux.yml
+  - https://invent.kde.org/sysadmin/ci-utilities/raw/master/gitlab-templates/linux-static.yml
   - https://invent.kde.org/sysadmin/ci-utilities/raw/master/gitlab-templates/android.yml
   - https://invent.kde.org/sysadmin/ci-utilities/raw/master/gitlab-templates/freebsd.yml
   - https://invent.kde.org/sysadmin/ci-utilities/raw/master/gitlab-templates/linux-qt6.yml
   - https://invent.kde.org/sysadmin/ci-utilities/raw/master/gitlab-templates/android-qt6.yml
   - https://invent.kde.org/sysadmin/ci-utilities/raw/master/gitlab-templates/windows.yml
+  - https://invent.kde.org/sysadmin/ci-utilities/raw/master/gitlab-templates/windows-static.yml
   - https://invent.kde.org/sysadmin/ci-utilities/raw/master/gitlab-templates/freebsd-qt6.yml
+  - https://invent.kde.org/sysadmin/ci-utilities/raw/master/gitlab-templates/windows-qt6.yml

CMakeLists.txt

@@ -3,12 +3,12 @@ cmake_minimum_required(VERSION 3.16)
 project(KImageFormats)
 
 include(FeatureSummary)
-find_package(ECM 5.98.0  NO_MODULE)
+find_package(ECM 5.107.0  NO_MODULE)
 set_package_properties(ECM PROPERTIES TYPE REQUIRED DESCRIPTION "Extra CMake Modules." URL "https://commits.kde.org/extra-cmake-modules")
 feature_summary(WHAT REQUIRED_PACKAGES_NOT_FOUND FATAL_ON_MISSING_REQUIRED_PACKAGES)
 
 
-set(CMAKE_MODULE_PATH ${ECM_MODULE_PATH})
+set(CMAKE_MODULE_PATH ${KImageFormats_SOURCE_DIR}/cmake/find-modules ${ECM_MODULE_PATH})
 
 include(KDEInstallDirs)
 include(KDEFrameworkCompilerSettings NO_POLICY_SCOPE)
@@ -70,6 +70,13 @@ if(KIMAGEFORMATS_JXL)
 endif()
 add_feature_info(LibJXL LibJXL_FOUND "required for the QImage plugin for JPEG XL images")
 
+# note: module FindLibRaw missing from https://invent.kde.org/frameworks/extra-cmake-modules
+find_package(LibRaw 0.20.2)
+set_package_properties(LibRaw PROPERTIES
+    TYPE OPTIONAL
+    PURPOSE "Required for the QImage plugin for RAW images"
+)
+
 ecm_set_disabled_deprecation_versions(
     QT 5.15.2
     KF 5.95

README.md

@@ -18,6 +18,7 @@ The following image formats have read-only support:
 - OpenEXR (exr)
 - Photoshop documents (psd, psb, pdd, psdt)
 - Sun Raster (ras)
+- Camera RAW images (arw, cr2, cr3, dcs, dng, ...)
 
 The following image formats have read and write support:
 

autotests/CMakeLists.txt

@@ -136,7 +136,15 @@ kimageformats_write_tests(
 #    kimageformats_write_tests(eps)
 #endif()
 if (OpenEXR_FOUND)
-    # FIXME: OpenEXR tests
+    kimageformats_read_tests(
+        exr
+    )
+endif()
+
+if (LibRaw_FOUND)
+    kimageformats_read_tests(
+        raw
+    )
 endif()
 
 find_package(Qt${QT_MAJOR_VERSION}Test ${REQUIRED_QT_VERSION} CONFIG QUIET)

autotests/readtest.cpp

@@ -9,6 +9,7 @@
 #include <QCommandLineParser>
 #include <QCoreApplication>
 #include <QDir>
+#include <QFile>
 #include <QFileInfo>
 #include <QImage>
 #include <QImageReader>
@@ -18,6 +19,44 @@
 
 #include "fuzzyeq.cpp"
 
+/**
+ * @brief The SequentialFile class
+ * Class to make a file a sequential access device. This class is used to check if the plugins could works
+ * on a sequential device such as a socket.
+ */
+class SequentialFile : public QFile
+{
+public:
+    SequentialFile()
+        : QFile()
+    {
+    }
+    explicit SequentialFile(const QString &name)
+        : QFile(name)
+    {
+    }
+#ifndef QT_NO_QOBJECT
+    explicit SequentialFile(QObject *parent)
+        : QFile(parent)
+    {
+    }
+    SequentialFile(const QString &name, QObject *parent)
+        : QFile(name, parent)
+    {
+    }
+#endif
+
+    bool isSequential() const override
+    {
+        return true;
+    }
+
+    qint64 size() const override
+    {
+        return bytesAvailable();
+    }
+};
+
 static void writeImageData(const char *name, const QString &filename, const QImage &image)
 {
     QFile file(filename);
@@ -56,7 +95,7 @@ int main(int argc, char **argv)
     QCoreApplication::removeLibraryPath(QStringLiteral(PLUGIN_DIR));
     QCoreApplication::addLibraryPath(QStringLiteral(PLUGIN_DIR));
     QCoreApplication::setApplicationName(QStringLiteral("readtest"));
-    QCoreApplication::setApplicationVersion(QStringLiteral("1.0.0"));
+    QCoreApplication::setApplicationVersion(QStringLiteral("1.1.0"));
 
     QCommandLineParser parser;
     parser.setApplicationDescription(QStringLiteral("Performs basic image conversion checking."));
@@ -94,11 +133,11 @@ int main(int argc, char **argv)
     QByteArray format = suffix.toLatin1();
 
     QDir imgdir(QLatin1String(IMAGEDIR "/") + suffix);
-    imgdir.setNameFilters(QStringList(QLatin1String("*.") + suffix));
     imgdir.setFilter(QDir::Files);
 
     int passed = 0;
     int failed = 0;
+    int skipped = 0;
 
     QTextStream(stdout) << "********* "
                         << "Starting basic read tests for " << suffix << " images *********\n";
@@ -112,69 +151,96 @@ int main(int argc, char **argv)
     QTextStream(stdout) << "QImageReader::supportedImageFormats: " << formatStrings.join(", ") << "\n";
 
     const QFileInfoList lstImgDir = imgdir.entryInfoList();
-    for (const QFileInfo &fi : lstImgDir) {
-        int suffixPos = fi.filePath().count() - suffix.count();
-        QString inputfile = fi.filePath();
-        QString expfile = fi.filePath().replace(suffixPos, suffix.count(), QStringLiteral("png"));
-        QString expfilename = QFileInfo(expfile).fileName();
-
-        QImageReader inputReader(inputfile, format);
-        QImageReader expReader(expfile, "png");
-
-        QImage inputImage;
-        QImage expImage;
-
-        if (!expReader.read(&expImage)) {
-            QTextStream(stdout) << "ERROR: " << fi.fileName() << ": could not load " << expfilename << ": " << expReader.errorString() << "\n";
-            ++failed;
-            continue;
-        }
-        if (!inputReader.canRead()) {
-            QTextStream(stdout) << "FAIL : " << fi.fileName() << ": failed can read: " << inputReader.errorString() << "\n";
-            ++failed;
-            continue;
-        }
-        if (!inputReader.read(&inputImage)) {
-            QTextStream(stdout) << "FAIL : " << fi.fileName() << ": failed to load: " << inputReader.errorString() << "\n";
-            ++failed;
-            continue;
-        }
-        if (expImage.width() != inputImage.width()) {
-            QTextStream(stdout) << "FAIL : " << fi.fileName() << ": width was " << inputImage.width() << " but " << expfilename << " width was "
-                                << expImage.width() << "\n";
-            ++failed;
-        } else if (expImage.height() != inputImage.height()) {
-            QTextStream(stdout) << "FAIL : " << fi.fileName() << ": height was " << inputImage.height() << " but " << expfilename << " height was "
-                                << expImage.height() << "\n";
-            ++failed;
+    // Launch 2 runs for each test: first run on a random access device, second run on a sequential access device
+    for (int seq = 0; seq < 2; ++seq) {
+        if (seq) {
+            QTextStream(stdout) << "* Run on SEQUENTIAL ACCESS device\n";
         } else {
-            QImage::Format inputFormat = preferredFormat(inputImage.format());
-            QImage::Format expFormat = preferredFormat(expImage.format());
-            QImage::Format cmpFormat = inputFormat == expFormat ? inputFormat : QImage::Format_ARGB32;
+            QTextStream(stdout) << "* Run on RANDOM ACCESS device\n";
+        }
+        for (const QFileInfo &fi : lstImgDir) {
+            if (!fi.suffix().compare("png", Qt::CaseInsensitive) || !fi.suffix().compare("tif", Qt::CaseInsensitive)) {
+                continue;
+            }
+            int suffixPos = fi.filePath().count() - suffix.count();
+            QString inputfile = fi.filePath();
+            QString fmt = QStringLiteral("png");
+            QString expfile = fi.filePath().replace(suffixPos, suffix.count(), fmt);
+            if (!QFile::exists(expfile)) { // try with tiff
+                fmt = QStringLiteral("tif");
+                expfile = fi.filePath().replace(suffixPos, suffix.count(), fmt);
+            }
+            QString expfilename = QFileInfo(expfile).fileName();
 
-            if (inputImage.format() != cmpFormat) {
-                QTextStream(stdout) << "INFO : " << fi.fileName() << ": converting " << fi.fileName() << " from " << formatToString(inputImage.format())
-                                    << " to " << formatToString(cmpFormat) << '\n';
-                inputImage = inputImage.convertToFormat(cmpFormat);
-            }
-            if (expImage.format() != cmpFormat) {
-                QTextStream(stdout) << "INFO : " << fi.fileName() << ": converting " << expfilename << " from " << formatToString(expImage.format()) << " to "
-                                    << formatToString(cmpFormat) << '\n';
-                expImage = expImage.convertToFormat(cmpFormat);
-            }
-            if (fuzzyeq(inputImage, expImage, fuzziness)) {
-                QTextStream(stdout) << "PASS : " << fi.fileName() << "\n";
-                ++passed;
-            } else {
-                QTextStream(stdout) << "FAIL : " << fi.fileName() << ": differs from " << expfilename << "\n";
-                writeImageData("expected data", fi.fileName() + QLatin1String("-expected.data"), expImage);
-                writeImageData("actual data", fi.fileName() + QLatin1String("-actual.data"), inputImage);
+            std::unique_ptr<QIODevice> inputDevice(seq ? new SequentialFile(inputfile) : new QFile(inputfile));
+            QImageReader inputReader(inputDevice.get(), format);
+            QImageReader expReader(expfile, fmt.toLatin1());
+
+            QImage inputImage;
+            QImage expImage;
+
+            // inputImage is auto-rotated to final orientation
+            inputReader.setAutoTransform(true);
+
+            if (!expReader.read(&expImage)) {
+                QTextStream(stdout) << "ERROR: " << fi.fileName() << ": could not load " << expfilename << ": " << expReader.errorString() << "\n";
                 ++failed;
+                continue;
+            }
+            if (!inputReader.canRead()) {
+                // All plugins must pass the test on a random device.
+                // canRead() must also return false if the plugin is unable to run on a sequential device.
+                if (inputDevice->isSequential()) {
+                    QTextStream(stdout) << "SKIP : " << fi.fileName() << ": cannot read on a sequential device (don't worry, it's ok)\n";
+                    ++skipped;
+                } else {
+                    QTextStream(stdout) << "FAIL : " << fi.fileName() << ": failed can read: " << inputReader.errorString() << "\n";
+                    ++failed;
+                }
+                continue;
+            }
+            if (!inputReader.read(&inputImage)) {
+                QTextStream(stdout) << "FAIL : " << fi.fileName() << ": failed to load: " << inputReader.errorString() << "\n";
+                ++failed;
+                continue;
+            }
+            if (expImage.width() != inputImage.width()) {
+                QTextStream(stdout) << "FAIL : " << fi.fileName() << ": width was " << inputImage.width() << " but " << expfilename << " width was "
+                                    << expImage.width() << "\n";
+                ++failed;
+            } else if (expImage.height() != inputImage.height()) {
+                QTextStream(stdout) << "FAIL : " << fi.fileName() << ": height was " << inputImage.height() << " but " << expfilename << " height was "
+                                    << expImage.height() << "\n";
+                ++failed;
+            } else {
+                QImage::Format inputFormat = preferredFormat(inputImage.format());
+                QImage::Format expFormat = preferredFormat(expImage.format());
+                QImage::Format cmpFormat = inputFormat == expFormat ? inputFormat : QImage::Format_ARGB32;
+
+                if (inputImage.format() != cmpFormat) {
+                    QTextStream(stdout) << "INFO : " << fi.fileName() << ": converting " << fi.fileName() << " from " << formatToString(inputImage.format())
+                                        << " to " << formatToString(cmpFormat) << '\n';
+                    inputImage = inputImage.convertToFormat(cmpFormat);
+                }
+                if (expImage.format() != cmpFormat) {
+                    QTextStream(stdout) << "INFO : " << fi.fileName() << ": converting " << expfilename << " from " << formatToString(expImage.format())
+                                        << " to " << formatToString(cmpFormat) << '\n';
+                    expImage = expImage.convertToFormat(cmpFormat);
+                }
+                if (fuzzyeq(inputImage, expImage, fuzziness)) {
+                    QTextStream(stdout) << "PASS : " << fi.fileName() << "\n";
+                    ++passed;
+                } else {
+                    QTextStream(stdout) << "FAIL : " << fi.fileName() << ": differs from " << expfilename << "\n";
+                    writeImageData("expected data", fi.fileName() + QLatin1String("-expected.data"), expImage);
+                    writeImageData("actual data", fi.fileName() + QLatin1String("-actual.data"), inputImage);
+                    ++failed;
+                }
             }
         }
     }
 
-    QTextStream(stdout) << "Totals: " << passed << " passed, " << failed << " failed\n";
+    QTextStream(stdout) << "Totals: " << passed << " passed, " << skipped << " skipped, " << failed << " failed\n";
     QTextStream(stdout) << "********* "
                         << "Finished basic read tests for " << suffix << " images *********\n";
 

cmake/find-modules/FindLibRaw.cmake

@@ -0,0 +1,86 @@
+# - Find LibRaw
+# Find the LibRaw library <https://www.libraw.org>
+# This module defines
+#  LibRaw_VERSION, the version string of LibRaw
+#  LibRaw_INCLUDE_DIR, where to find libraw/libraw.h
+#  LibRaw_LIBRARIES, the libraries needed to use LibRaw (non-thread-safe)
+#  LibRaw_r_LIBRARIES, the libraries needed to use LibRaw (thread-safe)
+#  LibRaw_DEFINITIONS, the definitions needed to use LibRaw (non-thread-safe)
+#  LibRaw_r_DEFINITIONS, the definitions needed to use LibRaw (thread-safe)
+#
+# SPDX-FileCopyrightText: 2013 Pino Toscano <pino at kde dot org>
+# SPDX-FileCopyrightText: 2013 Gilles Caulier <caulier dot gilles at gmail dot com>
+#
+# SPDX-License-Identifier: BSD-3-Clause
+
+FIND_PACKAGE(PkgConfig)
+
+IF(PKG_CONFIG_FOUND)
+   PKG_CHECK_MODULES(PC_LIBRAW libraw)
+   SET(LibRaw_DEFINITIONS ${PC_LIBRAW_CFLAGS_OTHER})
+
+   PKG_CHECK_MODULES(PC_LIBRAW_R libraw_r)
+   SET(LibRaw_r_DEFINITIONS ${PC_LIBRAW_R_CFLAGS_OTHER})   
+ENDIF()
+
+FIND_PATH(LibRaw_INCLUDE_DIR libraw/libraw.h
+          HINTS
+          ${PC_LIBRAW_INCLUDEDIR}
+          ${PC_LibRaw_INCLUDE_DIRS}
+         )
+
+FIND_LIBRARY(LibRaw_LIBRARIES NAMES raw
+             HINTS
+             ${PC_LIBRAW_LIBDIR}
+             ${PC_LIBRAW_LIBRARY_DIRS}
+            )
+
+FIND_LIBRARY(LibRaw_r_LIBRARIES NAMES raw_r
+             HINTS
+             ${PC_LIBRAW_R_LIBDIR}
+             ${PC_LIBRAW_R_LIBRARY_DIRS}
+            )
+
+IF(LibRaw_INCLUDE_DIR)
+   FILE(READ ${LibRaw_INCLUDE_DIR}/libraw/libraw_version.h _libraw_version_content)
+   
+   STRING(REGEX MATCH "#define LIBRAW_MAJOR_VERSION[ \t]*([0-9]*)\n" _version_major_match ${_libraw_version_content})
+   SET(_libraw_version_major "${CMAKE_MATCH_1}")
+   
+   STRING(REGEX MATCH "#define LIBRAW_MINOR_VERSION[ \t]*([0-9]*)\n" _version_minor_match ${_libraw_version_content})
+   SET(_libraw_version_minor "${CMAKE_MATCH_1}")
+   
+   STRING(REGEX MATCH "#define LIBRAW_PATCH_VERSION[ \t]*([0-9]*)\n" _version_patch_match ${_libraw_version_content})
+   SET(_libraw_version_patch "${CMAKE_MATCH_1}")
+   
+   IF(_version_major_match AND _version_minor_match AND _version_patch_match)
+      SET(LibRaw_VERSION "${_libraw_version_major}.${_libraw_version_minor}.${_libraw_version_patch}")
+   ELSE()
+      IF(NOT LibRaw_FIND_QUIETLY)
+         MESSAGE(STATUS "Failed to get version information from ${LibRaw_INCLUDE_DIR}/libraw/libraw_version.h")
+      ENDIF()
+   ENDIF()
+ENDIF()
+
+INCLUDE(FindPackageHandleStandardArgs)
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(LibRaw
+                                  REQUIRED_VARS LibRaw_LIBRARIES LibRaw_INCLUDE_DIR
+                                  VERSION_VAR LibRaw_VERSION
+                                 )
+
+MARK_AS_ADVANCED(LibRaw_VERSION
+                 LibRaw_INCLUDE_DIR
+                 LibRaw_LIBRARIES
+                 LibRaw_r_LIBRARIES
+                 LibRaw_DEFINITIONS
+                 LibRaw_r_DEFINITIONS
+                 )
+
+if(LibRaw_FOUND AND NOT TARGET LibRaw::LibRaw)
+    add_library(LibRaw::LibRaw UNKNOWN IMPORTED)
+    set_target_properties(LibRaw::LibRaw PROPERTIES
+        IMPORTED_LOCATION "${LibRaw_LIBRARIES}"
+        INTERFACE_COMPILE_OPTIONS "${LibRaw_DEFINITIONS}"
+        INTERFACE_INCLUDE_DIRECTORIES "${LibRaw_INCLUDE_DIR}"
+    )
+endif()

src/imageformats/CMakeLists.txt

@@ -20,19 +20,26 @@ endfunction()
 ##################################
 
 kimageformats_add_plugin(kimg_ani SOURCES ani.cpp)
-install(FILES ani.desktop DESTINATION ${KDE_INSTALL_KSERVICESDIR}/qimageioplugins/)
+
+if (QT_MAJOR_VERSION STREQUAL "5")
+    install(FILES ani.desktop DESTINATION ${KDE_INSTALL_KSERVICESDIR}/qimageioplugins/)
+endif()
 
 ##################################
 
 if (TARGET avif)
     kimageformats_add_plugin(kimg_avif SOURCES "avif.cpp")
     target_link_libraries(kimg_avif "avif")
-    install(FILES avif.desktop DESTINATION ${KDE_INSTALL_KSERVICESDIR}/qimageioplugins/)
+    if (QT_MAJOR_VERSION STREQUAL "5")
+        install(FILES avif.desktop DESTINATION ${KDE_INSTALL_KSERVICESDIR}/qimageioplugins/)
+    endif()
 endif()
 
 ##################################
 
-install(FILES dds-qt.desktop RENAME dds.desktop DESTINATION ${KDE_INSTALL_KSERVICESDIR}/qimageioplugins/)
+if (QT_MAJOR_VERSION STREQUAL "5")
+    install(FILES dds-qt.desktop RENAME dds.desktop DESTINATION ${KDE_INSTALL_KSERVICESDIR}/qimageioplugins/)
+endif()
 
 ##################################
 
@@ -40,14 +47,18 @@ if (BUILD_EPS_PLUGIN)
     if (TARGET Qt${QT_MAJOR_VERSION}::PrintSupport)
         kimageformats_add_plugin(kimg_eps SOURCES eps.cpp)
         target_link_libraries(kimg_eps Qt${QT_MAJOR_VERSION}::PrintSupport)
-        install(FILES eps.desktop DESTINATION ${KDE_INSTALL_KSERVICESDIR}/qimageioplugins/)
+        if (QT_MAJOR_VERSION STREQUAL "5")
+            install(FILES eps.desktop DESTINATION ${KDE_INSTALL_KSERVICESDIR}/qimageioplugins/)
+        endif()
     endif()
 endif()
 
 ##################################
 
-# need this for Qt's version of the plugin
-install(FILES jp2.desktop DESTINATION ${KDE_INSTALL_KSERVICESDIR}/qimageioplugins/)
+if (QT_MAJOR_VERSION STREQUAL "5")
+    # need this for Qt's version of the plugin
+    install(FILES jp2.desktop DESTINATION ${KDE_INSTALL_KSERVICESDIR}/qimageioplugins/)
+endif()
 
 ##################################
 
@@ -65,21 +76,27 @@ if(OpenEXR_FOUND)
     endif()
     kde_target_enable_exceptions(kimg_exr PRIVATE)
 
-    install(FILES exr.desktop DESTINATION ${KDE_INSTALL_KSERVICESDIR}/qimageioplugins/)
+    if (QT_MAJOR_VERSION STREQUAL "5")
+        install(FILES exr.desktop DESTINATION ${KDE_INSTALL_KSERVICESDIR}/qimageioplugins/)
+    endif()
 endif()
 
 ##################################
 
 kimageformats_add_plugin(kimg_hdr SOURCES hdr.cpp)
-install(FILES hdr.desktop DESTINATION ${KDE_INSTALL_KSERVICESDIR}/qimageioplugins/)
+if (QT_MAJOR_VERSION STREQUAL "5")
+    install(FILES hdr.desktop DESTINATION ${KDE_INSTALL_KSERVICESDIR}/qimageioplugins/)
+endif()
 
 ##################################
 
 if (LibHeif_FOUND)
     kimageformats_add_plugin(kimg_heif SOURCES heif.cpp)
     target_link_libraries(kimg_heif PkgConfig::LibHeif)
-    kde_target_enable_exceptions(kimg_heif PRIVATE)
-    install(FILES heif.desktop DESTINATION ${KDE_INSTALL_KSERVICESDIR}/qimageioplugins/)
+
+    if (QT_MAJOR_VERSION STREQUAL "5")
+        install(FILES heif.desktop DESTINATION ${KDE_INSTALL_KSERVICESDIR}/qimageioplugins/)
+    endif()
 endif()
 
 ##################################
@@ -90,43 +107,71 @@ if (LibJXL_FOUND AND LibJXLThreads_FOUND)
     if (LibJXL_VERSION VERSION_GREATER_EQUAL "0.7.0")
         target_compile_definitions(kimg_jxl PRIVATE KIMG_JXL_API_VERSION=70)
     endif()
-    install(FILES jxl.desktop DESTINATION ${KDE_INSTALL_KSERVICESDIR}/qimageioplugins/)
+
+    if (QT_MAJOR_VERSION STREQUAL "5")
+        install(FILES jxl.desktop DESTINATION ${KDE_INSTALL_KSERVICESDIR}/qimageioplugins/)
+    endif()
 endif()
 
 ##################################
 
 kimageformats_add_plugin(kimg_pcx SOURCES pcx.cpp)
-install(FILES pcx.desktop DESTINATION ${KDE_INSTALL_KSERVICESDIR}/qimageioplugins/)
+if (QT_MAJOR_VERSION STREQUAL "5")
+    install(FILES pcx.desktop DESTINATION ${KDE_INSTALL_KSERVICESDIR}/qimageioplugins/)
+endif()
 
 ##################################
 
 kimageformats_add_plugin(kimg_pic SOURCES pic.cpp)
-install(FILES pic.desktop DESTINATION ${KDE_INSTALL_KSERVICESDIR}/qimageioplugins/)
+if (QT_MAJOR_VERSION STREQUAL "5")
+    install(FILES pic.desktop DESTINATION ${KDE_INSTALL_KSERVICESDIR}/qimageioplugins/)
+endif()
 
 ##################################
 
 kimageformats_add_plugin(kimg_psd SOURCES psd.cpp)
-install(FILES psd.desktop DESTINATION ${KDE_INSTALL_KSERVICESDIR}/qimageioplugins/)
+if (QT_MAJOR_VERSION STREQUAL "5")
+    install(FILES psd.desktop DESTINATION ${KDE_INSTALL_KSERVICESDIR}/qimageioplugins/)
+endif()
 
 ##################################
 
 kimageformats_add_plugin(kimg_ras SOURCES ras.cpp)
-install(FILES ras.desktop DESTINATION ${KDE_INSTALL_KSERVICESDIR}/qimageioplugins/)
+if (QT_MAJOR_VERSION STREQUAL "5")
+    install(FILES ras.desktop DESTINATION ${KDE_INSTALL_KSERVICESDIR}/qimageioplugins/)
+endif()
 
 ##################################
 
 kimageformats_add_plugin(kimg_rgb SOURCES rgb.cpp)
-install(FILES rgb.desktop DESTINATION ${KDE_INSTALL_KSERVICESDIR}/qimageioplugins/)
+if (QT_MAJOR_VERSION STREQUAL "5")
+    install(FILES rgb.desktop DESTINATION ${KDE_INSTALL_KSERVICESDIR}/qimageioplugins/)
+endif()
 
 ##################################
 
 kimageformats_add_plugin(kimg_tga SOURCES tga.cpp)
-install(FILES tga.desktop DESTINATION ${KDE_INSTALL_KSERVICESDIR}/qimageioplugins/)
+if (QT_MAJOR_VERSION STREQUAL "5")
+    install(FILES tga.desktop DESTINATION ${KDE_INSTALL_KSERVICESDIR}/qimageioplugins/)
+endif()
 
 ##################################
 
 kimageformats_add_plugin(kimg_xcf SOURCES xcf.cpp)
-install(FILES xcf.desktop DESTINATION ${KDE_INSTALL_KSERVICESDIR}/qimageioplugins/)
+if (QT_MAJOR_VERSION STREQUAL "5")
+    install(FILES xcf.desktop DESTINATION ${KDE_INSTALL_KSERVICESDIR}/qimageioplugins/)
+endif()
+
+##################################
+
+if (LibRaw_FOUND)
+    kimageformats_add_plugin(kimg_raw SOURCES raw.cpp)
+    kde_enable_exceptions()
+    target_link_libraries(kimg_raw LibRaw::LibRaw)
+    if (QT_MAJOR_VERSION STREQUAL "5")
+        install(FILES raw.desktop DESTINATION ${KDE_INSTALL_KSERVICESDIR}/qimageioplugins/)
+    endif()
+endif()
 
 ##################################
 
@@ -134,10 +179,14 @@ if (KF5Archive_FOUND)
 
     kimageformats_add_plugin(kimg_kra SOURCES kra.cpp)
     target_link_libraries(kimg_kra KF5::Archive)
-    install(FILES kra.desktop DESTINATION ${KDE_INSTALL_KSERVICESDIR}/qimageioplugins/)
+    if (QT_MAJOR_VERSION STREQUAL "5")
+        install(FILES kra.desktop DESTINATION ${KDE_INSTALL_KSERVICESDIR}/qimageioplugins/)
+    endif()
 
     kimageformats_add_plugin(kimg_ora SOURCES ora.cpp)
     target_link_libraries(kimg_ora KF5::Archive)
-    install(FILES ora.desktop DESTINATION ${KDE_INSTALL_KSERVICESDIR}/qimageioplugins/)
+    if (QT_MAJOR_VERSION STREQUAL "5")
+        install(FILES ora.desktop DESTINATION ${KDE_INSTALL_KSERVICESDIR}/qimageioplugins/)
+    endif()
 
 endif()

src/imageformats/ani.cpp

@@ -521,6 +521,9 @@ bool ANIHandler::canRead(QIODevice *device)
         qWarning("ANIHandler::canRead() called with no device");
         return false;
     }
+    if (device->isSequential()) {
+        return false;
+    }
 
     const QByteArray riffIntro = device->peek(12);
 

src/imageformats/avif.cpp

@@ -12,6 +12,8 @@
 #include <QColorSpace>
 
 #include "avif_p.h"
+#include "util_p.h"
+
 #include <cfloat>
 
 QAVIFHandler::QAVIFHandler()
@@ -40,6 +42,11 @@ bool QAVIFHandler::canRead() const
 
     if (m_parseState != ParseAvifError) {
         setFormat("avif");
+
+        if (m_parseState == ParseAvifFinished) {
+            return false;
+        }
+
         return true;
     }
     return false;
@@ -56,7 +63,7 @@ bool QAVIFHandler::canRead(QIODevice *device)
     }
 
     avifROData input;
-    input.data = (const uint8_t *)header.constData();
+    input.data = reinterpret_cast<const uint8_t *>(header.constData());
     input.size = header.size();
 
     if (avifPeekCompatibleFileType(&input)) {
@@ -67,7 +74,7 @@ bool QAVIFHandler::canRead(QIODevice *device)
 
 bool QAVIFHandler::ensureParsed() const
 {
-    if (m_parseState == ParseAvifSuccess || m_parseState == ParseAvifMetadata) {
+    if (m_parseState == ParseAvifSuccess || m_parseState == ParseAvifMetadata || m_parseState == ParseAvifFinished) {
         return true;
     }
     if (m_parseState == ParseAvifError) {
@@ -81,7 +88,7 @@ bool QAVIFHandler::ensureParsed() const
 
 bool QAVIFHandler::ensureOpened() const
 {
-    if (m_parseState == ParseAvifSuccess) {
+    if (m_parseState == ParseAvifSuccess || m_parseState == ParseAvifFinished) {
         return true;
     }
     if (m_parseState == ParseAvifError) {
@@ -109,7 +116,7 @@ bool QAVIFHandler::ensureDecoder()
 
     m_rawData = device()->readAll();
 
-    m_rawAvifData.data = (const uint8_t *)m_rawData.constData();
+    m_rawAvifData.data = reinterpret_cast<const uint8_t *>(m_rawData.constData());
     m_rawAvifData.size = m_rawData.size();
 
     if (avifPeekCompatibleFileType(&m_rawAvifData) == AVIF_FALSE) {
@@ -130,6 +137,10 @@ bool QAVIFHandler::ensureDecoder()
     m_decoder->strictFlags = AVIF_STRICT_DISABLED;
 #endif
 
+#if AVIF_VERSION >= 110000
+    m_decoder->imageDimensionLimit = 65535;
+#endif
+
     avifResult decodeResult;
 
     decodeResult = avifDecoderSetIOMemory(m_decoder, m_rawAvifData.data, m_rawAvifData.size);
@@ -235,8 +246,8 @@ bool QAVIFHandler::decode_one_frame()
             resultformat = QImage::Format_RGB32;
         }
     }
-    QImage result(m_decoder->image->width, m_decoder->image->height, resultformat);
 
+    QImage result = imageAlloc(m_decoder->image->width, m_decoder->image->height, resultformat);
     if (result.isNull()) {
         qWarning("Memory cannot be allocated");
         return false;
@@ -244,7 +255,7 @@ bool QAVIFHandler::decode_one_frame()
 
     QColorSpace colorspace;
     if (m_decoder->image->icc.data && (m_decoder->image->icc.size > 0)) {
-        const QByteArray icc_data((const char *)m_decoder->image->icc.data, (int)m_decoder->image->icc.size);
+        const QByteArray icc_data(reinterpret_cast<const char *>(m_decoder->image->icc.data), m_decoder->image->icc.size);
         colorspace = QColorSpace::fromIccProfile(icc_data);
         if (!colorspace.isValid()) {
             qWarning("AVIF image has Qt-unsupported or invalid ICC profile!");
@@ -452,6 +463,13 @@ bool QAVIFHandler::read(QImage *image)
     *image = m_current_image;
     if (imageCount() >= 2) {
         m_must_jump_to_next_image = true;
+        if (m_decoder->imageIndex >= m_decoder->imageCount - 1) {
+            // all frames in animation have been read
+            m_parseState = ParseAvifFinished;
+        }
+    } else {
+        // the static image has been read
+        m_parseState = ParseAvifFinished;
     }
     return true;
 }
@@ -749,7 +767,7 @@ bool QAVIFHandler::write(const QImage &image)
         avif->transferCharacteristics = transfer_to_save;
 
         if (iccprofile.size() > 0) {
-            avifImageSetProfileICC(avif, (const uint8_t *)iccprofile.constData(), iccprofile.size());
+            avifImageSetProfileICC(avif, reinterpret_cast<const uint8_t *>(iccprofile.constData()), iccprofile.size());
         }
 
         avifRGBImage rgb;
@@ -800,7 +818,7 @@ bool QAVIFHandler::write(const QImage &image)
     avifImageDestroy(avif);
 
     if (res == AVIF_RESULT_OK) {
-        qint64 status = device()->write((const char *)raw.data, raw.size);
+        qint64 status = device()->write(reinterpret_cast<const char *>(raw.data), raw.size);
         avifRWDataFree(&raw);
 
         if (status > 0) {
@@ -903,6 +921,7 @@ bool QAVIFHandler::jumpToNextImage()
 
     if (m_decoder->imageIndex >= 0) {
         if (m_decoder->imageCount < 2) {
+            m_parseState = ParseAvifSuccess;
             return true;
         }
 
@@ -947,10 +966,12 @@ bool QAVIFHandler::jumpToImage(int imageNumber)
 
     if (m_decoder->imageCount < 2) { // not an animation
         if (imageNumber == 0) {
-            return ensureOpened();
-        } else {
-            return false;
+            if (ensureOpened()) {
+                m_parseState = ParseAvifSuccess;
+                return true;
+            }
         }
+        return false;
     }
 
     if (imageNumber < 0 || imageNumber >= m_decoder->imageCount) { // wrong index
@@ -959,6 +980,7 @@ bool QAVIFHandler::jumpToImage(int imageNumber)
 
     if (imageNumber == m_decoder->imageIndex) { // we are here already
         m_must_jump_to_next_image = false;
+        m_parseState = ParseAvifSuccess;
         return true;
     }
 
@@ -1017,7 +1039,8 @@ int QAVIFHandler::loopCount() const
         return 0;
     }
 
-    return 1;
+    // Endless loop to work around https://github.com/AOMediaCodec/libavif/issues/347
+    return -1;
 }
 
 QPointF QAVIFHandler::CompatibleChromacity(qreal chrX, qreal chrY)
@@ -1034,12 +1057,26 @@ QPointF QAVIFHandler::CompatibleChromacity(qreal chrX, qreal chrY)
 
 QImageIOPlugin::Capabilities QAVIFPlugin::capabilities(QIODevice *device, const QByteArray &format) const
 {
+    static const bool isAvifDecoderAvailable(avifCodecName(AVIF_CODEC_CHOICE_AUTO, AVIF_CODEC_FLAG_CAN_DECODE) != nullptr);
+    static const bool isAvifEncoderAvailable(avifCodecName(AVIF_CODEC_CHOICE_AUTO, AVIF_CODEC_FLAG_CAN_ENCODE) != nullptr);
+
     if (format == "avif") {
-        return Capabilities(CanRead | CanWrite);
+        Capabilities format_cap;
+        if (isAvifDecoderAvailable) {
+            format_cap |= CanRead;
+        }
+        if (isAvifEncoderAvailable) {
+            format_cap |= CanWrite;
+        }
+        return format_cap;
     }
 
     if (format == "avifs") {
-        return Capabilities(CanRead);
+        Capabilities format_cap;
+        if (isAvifDecoderAvailable) {
+            format_cap |= CanRead;
+        }
+        return format_cap;
     }
 
     if (!format.isEmpty()) {
@@ -1050,10 +1087,10 @@ QImageIOPlugin::Capabilities QAVIFPlugin::capabilities(QIODevice *device, const
     }
 
     Capabilities cap;
-    if (device->isReadable() && QAVIFHandler::canRead(device)) {
+    if (device->isReadable() && QAVIFHandler::canRead(device) && isAvifDecoderAvailable) {
         cap |= CanRead;
     }
-    if (device->isWritable()) {
+    if (device->isWritable() && isAvifEncoderAvailable) {
         cap |= CanWrite;
     }
     return cap;

src/imageformats/avif_p.h

@@ -55,6 +55,7 @@ private:
         ParseAvifNotParsed = 0,
         ParseAvifSuccess = 1,
         ParseAvifMetadata = 2,
+        ParseAvifFinished = 3,
     };
 
     ParseAvifState m_parseState;

src/imageformats/exr.cpp

@@ -8,6 +8,7 @@
 */
 
 #include "exr_p.h"
+#include "util_p.h"
 
 #include <IexThrowErrnoExc.h>
 #include <ImathBox.h>
@@ -191,7 +192,7 @@ bool EXRHandler::read(QImage *outImage)
         width = dw.max.x - dw.min.x + 1;
         height = dw.max.y - dw.min.y + 1;
 
-        QImage image(width, height, QImage::Format_RGB32);
+        QImage image = imageAlloc(width, height, QImage::Format_RGB32);
         if (image.isNull()) {
             qWarning() << "Failed to allocate image, invalid size?" << QSize(width, height);
             return false;

src/imageformats/fastmath_p.h

@@ -0,0 +1,35 @@
+/*
+    Approximated math functions used into conversions.
+
+    SPDX-FileCopyrightText: Edward Kmett
+    SPDX-FileCopyrightText: 2023 Mirco Miranda <mircomir@outlook.com>
+
+    SPDX-License-Identifier: BSD-3-Clause
+*/
+#ifndef FASTMATH_P_H
+#define FASTMATH_P_H
+
+#include <QtGlobal>
+
+/*!
+ * \brief fastPow
+ * Based on Edward Kmett code released into the public domain.
+ * See also: https://github.com/ekmett/approximate
+ */
+inline double fastPow(double x, double y)
+{
+    union {
+        double d;
+        qint32 i[2];
+    } u = {x};
+#if Q_BYTE_ORDER == Q_LITTLE_ENDIAN
+    u.i[1] = qint32(y * (u.i[1] - 1072632447) + 1072632447);
+    u.i[0] = 0;
+#else // never tested
+    u.i[0] = qint32(y * (u.i[0] - 1072632447) + 1072632447);
+    u.i[1] = 0;
+#endif
+    return u.d;
+}
+
+#endif // FASTMATH_P_H

src/imageformats/hdr.cpp

@@ -7,6 +7,7 @@
 */
 
 #include "hdr_p.h"
+#include "util_p.h"
 
 #include <QDataStream>
 #include <QImage>
@@ -93,7 +94,7 @@ static bool LoadHDR(QDataStream &s, const int width, const int height, QImage &i
     uchar code;
 
     // Create dst image.
-    img = QImage(width, height, QImage::Format_RGB32);
+    img = imageAlloc(width, height, QImage::Format_RGB32);
     if (img.isNull()) {
         qCDebug(HDRPLUGIN) << "Couldn't create image with size" << width << height << "and format RGB32";
         return false;

src/imageformats/heif_p.h

@@ -13,6 +13,7 @@
 #include <QByteArray>
 #include <QImage>
 #include <QImageIOPlugin>
+#include <QMutex>
 
 class HEIFHandler : public QImageIOHandler
 {
@@ -29,6 +30,9 @@ public:
     void setOption(ImageOption option, const QVariant &value) override;
     bool supportsOption(ImageOption option) const override;
 
+    static bool isHeifDecoderAvailable();
+    static bool isHeifEncoderAvailable();
+
 private:
     static bool isSupportedBMFFType(const QByteArray &header);
     bool ensureParsed() const;
@@ -43,6 +47,18 @@ private:
     ParseHeicState m_parseState;
     int m_quality;
     QImage m_current_image;
+
+    bool write_helper(const QImage &image);
+
+    static void startHeifLib();
+    static void finishHeifLib();
+    static size_t m_initialized_count;
+
+    static bool m_plugins_queried;
+    static bool m_heif_decoder_available;
+    static bool m_heif_encoder_available;
+
+    static QMutex &getHEIFHandlerMutex();
 };
 
 class HEIFPlugin : public QImageIOPlugin

src/imageformats/jxl.cpp

@@ -10,6 +10,8 @@
 #include <QtGlobal>
 
 #include "jxl_p.h"
+#include "util_p.h"
+
 #include <jxl/encode.h>
 #include <jxl/thread_parallel_runner.h>
 #include <string.h>
@@ -46,6 +48,11 @@ bool QJpegXLHandler::canRead() const
 
     if (m_parseState != ParseJpegXLError) {
         setFormat("jxl");
+
+        if (m_parseState == ParseJpegXLFinished) {
+            return false;
+        }
+
         return true;
     }
     return false;
@@ -61,7 +68,7 @@ bool QJpegXLHandler::canRead(QIODevice *device)
         return false;
     }
 
-    JxlSignature signature = JxlSignatureCheck((const uint8_t *)header.constData(), header.size());
+    JxlSignature signature = JxlSignatureCheck(reinterpret_cast<const uint8_t *>(header.constData()), header.size());
     if (signature == JXL_SIG_CODESTREAM || signature == JXL_SIG_CONTAINER) {
         return true;
     }
@@ -70,7 +77,7 @@ bool QJpegXLHandler::canRead(QIODevice *device)
 
 bool QJpegXLHandler::ensureParsed() const
 {
-    if (m_parseState == ParseJpegXLSuccess || m_parseState == ParseJpegXLBasicInfoParsed) {
+    if (m_parseState == ParseJpegXLSuccess || m_parseState == ParseJpegXLBasicInfoParsed || m_parseState == ParseJpegXLFinished) {
         return true;
     }
     if (m_parseState == ParseJpegXLError) {
@@ -88,7 +95,7 @@ bool QJpegXLHandler::ensureALLCounted() const
         return false;
     }
 
-    if (m_parseState == ParseJpegXLSuccess) {
+    if (m_parseState == ParseJpegXLSuccess || m_parseState == ParseJpegXLFinished) {
         return true;
     }
 
@@ -109,7 +116,7 @@ bool QJpegXLHandler::ensureDecoder()
         return false;
     }
 
-    JxlSignature signature = JxlSignatureCheck((const uint8_t *)m_rawData.constData(), m_rawData.size());
+    JxlSignature signature = JxlSignatureCheck(reinterpret_cast<const uint8_t *>(m_rawData.constData()), m_rawData.size());
     if (signature != JXL_SIG_CODESTREAM && signature != JXL_SIG_CONTAINER) {
         m_parseState = ParseJpegXLError;
         return false;
@@ -137,7 +144,7 @@ bool QJpegXLHandler::ensureDecoder()
         }
     }
 
-    if (JxlDecoderSetInput(m_decoder, (const uint8_t *)m_rawData.constData(), m_rawData.size()) != JXL_DEC_SUCCESS) {
+    if (JxlDecoderSetInput(m_decoder, reinterpret_cast<const uint8_t *>(m_rawData.constData()), m_rawData.size()) != JXL_DEC_SUCCESS) {
         qWarning("ERROR: JxlDecoderSetInput failed");
         m_parseState = ParseJpegXLError;
         return false;
@@ -271,8 +278,12 @@ bool QJpegXLHandler::countALLFrames()
         size_t icc_size = 0;
         if (JxlDecoderGetICCProfileSize(m_decoder, &m_input_pixel_format, JXL_COLOR_PROFILE_TARGET_DATA, &icc_size) == JXL_DEC_SUCCESS) {
             if (icc_size > 0) {
-                QByteArray icc_data((int)icc_size, 0);
-                if (JxlDecoderGetColorAsICCProfile(m_decoder, &m_input_pixel_format, JXL_COLOR_PROFILE_TARGET_DATA, (uint8_t *)icc_data.data(), icc_data.size())
+                QByteArray icc_data(icc_size, 0);
+                if (JxlDecoderGetColorAsICCProfile(m_decoder,
+                                                   &m_input_pixel_format,
+                                                   JXL_COLOR_PROFILE_TARGET_DATA,
+                                                   reinterpret_cast<uint8_t *>(icc_data.data()),
+                                                   icc_data.size())
                     == JXL_DEC_SUCCESS) {
                     m_colorspace = QColorSpace::fromIccProfile(icc_data);
 
@@ -359,7 +370,7 @@ bool QJpegXLHandler::decode_one_frame()
         return false;
     }
 
-    m_current_image = QImage(m_basicinfo.xsize, m_basicinfo.ysize, m_input_image_format);
+    m_current_image = imageAlloc(m_basicinfo.xsize, m_basicinfo.ysize, m_input_image_format);
     if (m_current_image.isNull()) {
         qWarning("Memory cannot be allocated");
         m_parseState = ParseJpegXLError;
@@ -395,7 +406,15 @@ bool QJpegXLHandler::decode_one_frame()
             if (!rewind()) {
                 return false;
             }
+
+            // all frames in animation have been read
+            m_parseState = ParseJpegXLFinished;
+        } else {
+            m_parseState = ParseJpegXLSuccess;
         }
+    } else {
+        // the static image has been read
+        m_parseState = ParseJpegXLFinished;
     }
 
     return true;
@@ -607,7 +626,7 @@ bool QJpegXLHandler::write(const QImage &image)
     }
 
     if (!convert_color_profile && iccprofile.size() > 0) {
-        status = JxlEncoderSetICCProfile(encoder, (const uint8_t *)iccprofile.constData(), iccprofile.size());
+        status = JxlEncoderSetICCProfile(encoder, reinterpret_cast<const uint8_t *>(iccprofile.constData()), iccprofile.size());
         if (status != JXL_ENC_SUCCESS) {
             qWarning("JxlEncoderSetICCProfile failed!");
             if (runner) {
@@ -646,7 +665,7 @@ bool QJpegXLHandler::write(const QImage &image)
 #endif
 
     if (image.hasAlphaChannel() || ((save_depth == 8) && (xsize % 4 == 0))) {
-        status = JxlEncoderAddImageFrame(encoder_options, &pixel_format, (void *)tmpimage.constBits(), buffer_size);
+        status = JxlEncoderAddImageFrame(encoder_options, &pixel_format, static_cast<const void *>(tmpimage.constBits()), buffer_size);
     } else {
         if (save_depth > 8) { // 16bit depth without alpha channel
             uint16_t *tmp_buffer = new (std::nothrow) uint16_t[3 * xsize * ysize];
@@ -677,7 +696,7 @@ bool QJpegXLHandler::write(const QImage &image)
                     src_pixels += 2; // skipalpha
                 }
             }
-            status = JxlEncoderAddImageFrame(encoder_options, &pixel_format, (void *)tmp_buffer, buffer_size);
+            status = JxlEncoderAddImageFrame(encoder_options, &pixel_format, static_cast<const void *>(tmp_buffer), buffer_size);
             delete[] tmp_buffer;
         } else { // 8bit depth without alpha channel
             uchar *tmp_buffer8 = new (std::nothrow) uchar[3 * xsize * ysize];
@@ -696,7 +715,7 @@ bool QJpegXLHandler::write(const QImage &image)
                 memcpy(dest_pixels8, tmpimage.constScanLine(y), rowbytes);
                 dest_pixels8 += rowbytes;
             }
-            status = JxlEncoderAddImageFrame(encoder_options, &pixel_format, (void *)tmp_buffer8, buffer_size);
+            status = JxlEncoderAddImageFrame(encoder_options, &pixel_format, static_cast<const void *>(tmp_buffer8), buffer_size);
             delete[] tmp_buffer8;
         }
     }
@@ -743,7 +762,7 @@ bool QJpegXLHandler::write(const QImage &image)
     compressed.resize(next_out - compressed.data());
 
     if (compressed.size() > 0) {
-        qint64 write_status = device()->write((const char *)compressed.data(), compressed.size());
+        qint64 write_status = device()->write(reinterpret_cast<const char *>(compressed.data()), compressed.size());
 
         if (write_status > 0) {
             return true;
@@ -854,6 +873,7 @@ bool QJpegXLHandler::jumpToNextImage()
         }
     }
 
+    m_parseState = ParseJpegXLSuccess;
     return true;
 }
 
@@ -868,12 +888,14 @@ bool QJpegXLHandler::jumpToImage(int imageNumber)
     }
 
     if (imageNumber == m_currentimage_index) {
+        m_parseState = ParseJpegXLSuccess;
         return true;
     }
 
     if (imageNumber > m_currentimage_index) {
         JxlDecoderSkipFrames(m_decoder, imageNumber - m_currentimage_index);
         m_currentimage_index = imageNumber;
+        m_parseState = ParseJpegXLSuccess;
         return true;
     }
 
@@ -885,6 +907,7 @@ bool QJpegXLHandler::jumpToImage(int imageNumber)
         JxlDecoderSkipFrames(m_decoder, imageNumber);
     }
     m_currentimage_index = imageNumber;
+    m_parseState = ParseJpegXLSuccess;
     return true;
 }
 
@@ -908,7 +931,7 @@ int QJpegXLHandler::loopCount() const
     }
 
     if (m_basicinfo.have_animation) {
-        return 1;
+        return (m_basicinfo.animation.num_loops > 0) ? m_basicinfo.animation.num_loops - 1 : -1;
     } else {
         return 0;
     }
@@ -928,7 +951,7 @@ bool QJpegXLHandler::rewind()
         }
     }
 
-    if (JxlDecoderSetInput(m_decoder, (const uint8_t *)m_rawData.constData(), m_rawData.size()) != JXL_DEC_SUCCESS) {
+    if (JxlDecoderSetInput(m_decoder, reinterpret_cast<const uint8_t *>(m_rawData.constData()), m_rawData.size()) != JXL_DEC_SUCCESS) {
         qWarning("ERROR: JxlDecoderSetInput failed");
         m_parseState = ParseJpegXLError;
         return false;

src/imageformats/jxl_p.h

@@ -57,6 +57,7 @@ private:
         ParseJpegXLNotParsed = 0,
         ParseJpegXLSuccess = 1,
         ParseJpegXLBasicInfoParsed = 2,
+        ParseJpegXLFinished = 3,
     };
 
     ParseJpegXLState m_parseState;

src/imageformats/kra.cpp

@@ -57,6 +57,9 @@ bool KraHandler::canRead(QIODevice *device)
         qWarning("KraHandler::canRead() called with no device");
         return false;
     }
+    if (device->isSequential()) {
+        return false;
+    }
 
     char buff[57];
     if (device->peek(buff, sizeof(buff)) == sizeof(buff)) {

src/imageformats/ora.cpp

@@ -56,6 +56,9 @@ bool OraHandler::canRead(QIODevice *device)
         qWarning("OraHandler::canRead() called with no device");
         return false;
     }
+    if (device->isSequential()) {
+        return false;
+    }
 
     char buff[54];
     if (device->peek(buff, sizeof(buff)) == sizeof(buff)) {

src/imageformats/pcx.cpp

@@ -6,6 +6,7 @@
 */
 
 #include "pcx_p.h"
+#include "util_p.h"
 
 #include <QColor>
 #include <QDataStream>
@@ -173,7 +174,7 @@ static QDataStream &operator>>(QDataStream &s, PCXHEADER &ph)
 
     // Skip the rest of the header
     quint8 byte;
-    while (s.device()->pos() < 128) {
+    for (auto i = 0; i < 54; ++i) {
         s >> byte;
     }
 
@@ -229,7 +230,7 @@ PCXHEADER::PCXHEADER()
     s >> *this;
 }
 
-static void readLine(QDataStream &s, QByteArray &buf, const PCXHEADER &header)
+static bool readLine(QDataStream &s, QByteArray &buf, const PCXHEADER &header)
 {
     quint32 i = 0;
     quint32 size = buf.size();
@@ -256,27 +257,31 @@ static void readLine(QDataStream &s, QByteArray &buf, const PCXHEADER &header)
             buf[i++] = byte;
         }
     }
+
+    return (s.status() == QDataStream::Ok);
 }
 
-static void readImage1(QImage &img, QDataStream &s, const PCXHEADER &header)
+static bool readImage1(QImage &img, QDataStream &s, const PCXHEADER &header)
 {
     QByteArray buf(header.BytesPerLine, 0);
 
-    img = QImage(header.width(), header.height(), QImage::Format_Mono);
+    img = imageAlloc(header.width(), header.height(), QImage::Format_Mono);
     img.setColorCount(2);
 
     if (img.isNull()) {
         qWarning() << "Failed to allocate image, invalid dimensions?" << QSize(header.width(), header.height());
-        return;
+        return false;
     }
 
     for (int y = 0; y < header.height(); ++y) {
         if (s.atEnd()) {
-            img = QImage();
-            return;
+            return false;
+        }
+
+        if (!readLine(s, buf, header)) {
+            return false;
         }
 
-        readLine(s, buf, header);
         uchar *p = img.scanLine(y);
         unsigned int bpl = qMin((quint16)((header.width() + 7) / 8), header.BytesPerLine);
         for (unsigned int x = 0; x < bpl; ++x) {
@@ -287,28 +292,31 @@ static void readImage1(QImage &img, QDataStream &s, const PCXHEADER &header)
     // Set the color palette
     img.setColor(0, qRgb(0, 0, 0));
     img.setColor(1, qRgb(255, 255, 255));
+
+    return true;
 }
 
-static void readImage4(QImage &img, QDataStream &s, const PCXHEADER &header)
+static bool readImage4(QImage &img, QDataStream &s, const PCXHEADER &header)
 {
     QByteArray buf(header.BytesPerLine * 4, 0);
     QByteArray pixbuf(header.width(), 0);
 
-    img = QImage(header.width(), header.height(), QImage::Format_Indexed8);
+    img = imageAlloc(header.width(), header.height(), QImage::Format_Indexed8);
     img.setColorCount(16);
     if (img.isNull()) {
         qWarning() << "Failed to allocate image, invalid dimensions?" << QSize(header.width(), header.height());
-        return;
+        return false;
     }
 
     for (int y = 0; y < header.height(); ++y) {
         if (s.atEnd()) {
-            img = QImage();
-            return;
+            return false;
         }
 
         pixbuf.fill(0);
-        readLine(s, buf, header);
+        if (!readLine(s, buf, header)) {
+            return false;
+        }
 
         for (int i = 0; i < 4; i++) {
             quint32 offset = i * header.BytesPerLine;
@@ -332,32 +340,34 @@ static void readImage4(QImage &img, QDataStream &s, const PCXHEADER &header)
     for (int i = 0; i < 16; ++i) {
         img.setColor(i, header.ColorMap.color(i));
     }
+
+    return true;
 }
 
-static void readImage8(QImage &img, QDataStream &s, const PCXHEADER &header)
+static bool readImage8(QImage &img, QDataStream &s, const PCXHEADER &header)
 {
     QByteArray buf(header.BytesPerLine, 0);
 
-    img = QImage(header.width(), header.height(), QImage::Format_Indexed8);
+    img = imageAlloc(header.width(), header.height(), QImage::Format_Indexed8);
     img.setColorCount(256);
 
     if (img.isNull()) {
         qWarning() << "Failed to allocate image, invalid dimensions?" << QSize(header.width(), header.height());
-        return;
+        return false;
     }
 
     for (int y = 0; y < header.height(); ++y) {
         if (s.atEnd()) {
-            img = QImage();
-            return;
+            return false;
         }
 
-        readLine(s, buf, header);
+        if (!readLine(s, buf, header)) {
+            return false;
+        }
 
         uchar *p = img.scanLine(y);
-
         if (!p) {
-            return;
+            return false;
         }
 
         unsigned int bpl = qMin(header.BytesPerLine, (quint16)header.width());
@@ -366,10 +376,21 @@ static void readImage8(QImage &img, QDataStream &s, const PCXHEADER &header)
         }
     }
 
-    quint8 flag;
-    s >> flag;
-    //   qDebug() << "Palette Flag: " << flag;
+    // by specification, the extended palette starts at file.size() - 769
+    quint8 flag = 0;
+    if (auto device = s.device()) {
+        if (device->isSequential()) {
+            while (flag != 12 && s.status() == QDataStream::Ok) {
+                s >> flag;
+            }
+        }
+        else {
+            device->seek(device->size() - 769);
+            s >> flag;
+        }
+    }
 
+    //   qDebug() << "Palette Flag: " << flag;
     if (flag == 12 && (header.Version == 5 || header.Version == 2)) {
         // Read the palette
         quint8 r;
@@ -380,39 +401,48 @@ static void readImage8(QImage &img, QDataStream &s, const PCXHEADER &header)
             img.setColor(i, qRgb(r, g, b));
         }
     }
+
+    return (s.status() == QDataStream::Ok);
 }
 
-static void readImage24(QImage &img, QDataStream &s, const PCXHEADER &header)
+static bool readImage24(QImage &img, QDataStream &s, const PCXHEADER &header)
 {
     QByteArray r_buf(header.BytesPerLine, 0);
     QByteArray g_buf(header.BytesPerLine, 0);
     QByteArray b_buf(header.BytesPerLine, 0);
 
-    img = QImage(header.width(), header.height(), QImage::Format_RGB32);
+    img = imageAlloc(header.width(), header.height(), QImage::Format_RGB32);
 
     if (img.isNull()) {
         qWarning() << "Failed to allocate image, invalid dimensions?" << QSize(header.width(), header.height());
-        return;
+        return false;
     }
 
     for (int y = 0; y < header.height(); ++y) {
         if (s.atEnd()) {
-            img = QImage();
-            return;
+            return false;
         }
 
-        readLine(s, r_buf, header);
-        readLine(s, g_buf, header);
-        readLine(s, b_buf, header);
+        if (!readLine(s, r_buf, header)) {
+            return false;
+        }
+        if (!readLine(s, g_buf, header)) {
+            return false;
+        }
+        if (!readLine(s, b_buf, header)) {
+            return false;
+        }
 
         uint *p = (uint *)img.scanLine(y);
         for (int x = 0; x < header.width(); ++x) {
             p[x] = qRgb(r_buf[x], g_buf[x], b_buf[x]);
         }
     }
+
+    return true;
 }
 
-static void writeLine(QDataStream &s, QByteArray &buf)
+static bool writeLine(QDataStream &s, QByteArray &buf)
 {
     quint32 i = 0;
     quint32 size = buf.size();
@@ -438,15 +468,26 @@ static void writeLine(QDataStream &s, QByteArray &buf)
 
         s << data;
     }
+    return (s.status() == QDataStream::Ok);
 }
 
-static void writeImage1(QImage &img, QDataStream &s, PCXHEADER &header)
+static bool writeImage1(QImage &img, QDataStream &s, PCXHEADER &header)
 {
-    img = img.convertToFormat(QImage::Format_Mono);
+    if (img.format() != QImage::Format_Mono) {
+        img = img.convertToFormat(QImage::Format_Mono);
+    }
+    if (img.isNull() || img.colorCount() < 1) {
+        return false;
+    }
+    auto rgb = img.color(0);
+    auto minIsBlack = (qRed(rgb) + qGreen(rgb) + qBlue(rgb)) / 3 < 127;
 
     header.Bpp = 1;
     header.NPlanes = 1;
     header.BytesPerLine = img.bytesPerLine();
+    if (header.BytesPerLine == 0) {
+        return false;
+    }
 
     s << header;
 
@@ -457,18 +498,24 @@ static void writeImage1(QImage &img, QDataStream &s, PCXHEADER &header)
 
         // Invert as QImage uses reverse palette for monochrome images?
         for (int i = 0; i < header.BytesPerLine; ++i) {
-            buf[i] = ~p[i];
+            buf[i] = minIsBlack ? p[i] : ~p[i];
         }
 
-        writeLine(s, buf);
+        if (!writeLine(s, buf)) {
+            return false;
+        }
     }
+    return true;
 }
 
-static void writeImage4(QImage &img, QDataStream &s, PCXHEADER &header)
+static bool writeImage4(QImage &img, QDataStream &s, PCXHEADER &header)
 {
     header.Bpp = 1;
     header.NPlanes = 4;
     header.BytesPerLine = header.width() / 8;
+    if (header.BytesPerLine == 0) {
+        return false;
+    }
 
     for (int i = 0; i < 16; ++i) {
         header.ColorMap.setColor(i, img.color(i));
@@ -498,16 +545,22 @@ static void writeImage4(QImage &img, QDataStream &s, PCXHEADER &header)
         }
 
         for (int i = 0; i < 4; ++i) {
-            writeLine(s, buf[i]);
+            if (!writeLine(s, buf[i])) {
+                return false;
+            }
         }
     }
+    return true;
 }
 
-static void writeImage8(QImage &img, QDataStream &s, PCXHEADER &header)
+static bool writeImage8(QImage &img, QDataStream &s, PCXHEADER &header)
 {
     header.Bpp = 8;
     header.NPlanes = 1;
     header.BytesPerLine = img.bytesPerLine();
+    if (header.BytesPerLine == 0) {
+        return false;
+    }
 
     s << header;
 
@@ -520,7 +573,9 @@ static void writeImage8(QImage &img, QDataStream &s, PCXHEADER &header)
             buf[i] = p[i];
         }
 
-        writeLine(s, buf);
+        if (!writeLine(s, buf)) {
+            return false;
+        }
     }
 
     // Write palette flag
@@ -531,13 +586,25 @@ static void writeImage8(QImage &img, QDataStream &s, PCXHEADER &header)
     for (int i = 0; i < 256; ++i) {
         s << RGB::from(img.color(i));
     }
+
+    return (s.status() == QDataStream::Ok);
 }
 
-static void writeImage24(QImage &img, QDataStream &s, PCXHEADER &header)
+static bool writeImage24(QImage &img, QDataStream &s, PCXHEADER &header)
 {
     header.Bpp = 8;
     header.NPlanes = 3;
     header.BytesPerLine = header.width();
+    if (header.BytesPerLine == 0) {
+        return false;
+    }
+
+    if (img.format() != QImage::Format_ARGB32 && img.format() != QImage::Format_RGB32) {
+        img = img.convertToFormat(QImage::Format_RGB32);
+    }
+    if (img.isNull()) {
+        return false;
+    }
 
     s << header;
 
@@ -546,7 +613,7 @@ static void writeImage24(QImage &img, QDataStream &s, PCXHEADER &header)
     QByteArray b_buf(header.width(), 0);
 
     for (int y = 0; y < header.height(); ++y) {
-        uint *p = (uint *)img.scanLine(y);
+        auto p = (QRgb*)img.scanLine(y);
 
         for (int x = 0; x < header.width(); ++x) {
             QRgb rgb = *p++;
@@ -555,10 +622,18 @@ static void writeImage24(QImage &img, QDataStream &s, PCXHEADER &header)
             b_buf[x] = qBlue(rgb);
         }
 
-        writeLine(s, r_buf);
-        writeLine(s, g_buf);
-        writeLine(s, b_buf);
+        if (!writeLine(s, r_buf)) {
+            return false;
+        }
+        if (!writeLine(s, g_buf)) {
+            return false;
+        }
+        if (!writeLine(s, b_buf)) {
+            return false;
+        }
     }
+
+    return true;
 }
 
 PCXHandler::PCXHandler()
@@ -587,46 +662,30 @@ bool PCXHandler::read(QImage *outImage)
 
     s >> header;
 
-    if (header.Manufacturer != 10 || s.atEnd()) {
+    if (header.Manufacturer != 10 || header.BytesPerLine == 0 || s.atEnd()) {
         return false;
     }
 
-    //   int w = header.width();
-    //   int h = header.height();
-
-    //   qDebug() << "Manufacturer: " << header.Manufacturer;
-    //   qDebug() << "Version: " << header.Version;
-    //   qDebug() << "Encoding: " << header.Encoding;
-    //   qDebug() << "Bpp: " << header.Bpp;
-    //   qDebug() << "Width: " << w;
-    //   qDebug() << "Height: " << h;
-    //   qDebug() << "Window: " << header.XMin << "," << header.XMax << ","
-    //                  << header.YMin << "," << header.YMax << endl;
-    //   qDebug() << "BytesPerLine: " << header.BytesPerLine;
-    //   qDebug() << "NPlanes: " << header.NPlanes;
-
+    auto ok = false;
     QImage img;
-
     if (header.Bpp == 1 && header.NPlanes == 1) {
-        readImage1(img, s, header);
+        ok = readImage1(img, s, header);
     } else if (header.Bpp == 1 && header.NPlanes == 4) {
-        readImage4(img, s, header);
+        ok = readImage4(img, s, header);
     } else if (header.Bpp == 8 && header.NPlanes == 1) {
-        readImage8(img, s, header);
+        ok = readImage8(img, s, header);
     } else if (header.Bpp == 8 && header.NPlanes == 3) {
-        readImage24(img, s, header);
+        ok = readImage24(img, s, header);
     }
 
-    //   qDebug() << "Image Bytes: " << img.numBytes();
-    //   qDebug() << "Image Bytes Per Line: " << img.bytesPerLine();
-    //   qDebug() << "Image Depth: " << img.depth();
-
-    if (!img.isNull()) {
-        *outImage = img;
-        return true;
-    } else {
+    if (img.isNull() || !ok) {
         return false;
     }
+
+    img.setDotsPerMeterX(qRound(header.HDpi / 25.4 * 1000));
+    img.setDotsPerMeterY(qRound(header.YDpi / 25.4 * 1000));
+    *outImage = img;
+    return true;
 }
 
 bool PCXHandler::write(const QImage &image)
@@ -643,12 +702,6 @@ bool PCXHandler::write(const QImage &image)
         return false;
     }
 
-    //   qDebug() << "Width: " << w;
-    //   qDebug() << "Height: " << h;
-    //   qDebug() << "Depth: " << img.depth();
-    //   qDebug() << "BytesPerLine: " << img.bytesPerLine();
-    //   qDebug() << "Color Count: " << img.colorCount();
-
     PCXHEADER header;
 
     header.Manufacturer = 10;
@@ -658,22 +711,23 @@ bool PCXHandler::write(const QImage &image)
     header.YMin = 0;
     header.XMax = w - 1;
     header.YMax = h - 1;
-    header.HDpi = 300;
-    header.YDpi = 300;
+    header.HDpi = qRound(image.dotsPerMeterX() * 25.4 / 1000);
+    header.YDpi = qRound(image.dotsPerMeterY() * 25.4 / 1000);
     header.Reserved = 0;
     header.PaletteInfo = 1;
 
+    auto ok = false;
     if (img.depth() == 1) {
-        writeImage1(img, s, header);
+        ok = writeImage1(img, s, header);
     } else if (img.depth() == 8 && img.colorCount() <= 16) {
-        writeImage4(img, s, header);
+        ok = writeImage4(img, s, header);
     } else if (img.depth() == 8) {
-        writeImage8(img, s, header);
-    } else if (img.depth() == 32) {
-        writeImage24(img, s, header);
+        ok = writeImage8(img, s, header);
+    } else if (img.depth() >= 24) {
+        ok = writeImage24(img, s, header);
     }
 
-    return true;
+    return ok;
 }
 
 bool PCXHandler::canRead(QIODevice *device)

src/imageformats/pic.cpp

@@ -14,8 +14,8 @@
  */
 
 #include "pic_p.h"
-
 #include "rle_p.h"
+#include "util_p.h"
 
 #include <QDataStream>
 #include <QDebug>
@@ -238,7 +238,7 @@ bool SoftimagePICHandler::read(QImage *image)
         }
     }
 
-    QImage img(m_header.width, m_header.height, fmt);
+    QImage img = imageAlloc(m_header.width, m_header.height, fmt);
     if (img.isNull()) {
         qDebug() << "Failed to allocate image, invalid dimensions?" << QSize(m_header.width, m_header.height) << fmt;
         return false;

src/imageformats/psd.cpp

@@ -3,14 +3,14 @@
 
     SPDX-FileCopyrightText: 2003 Ignacio Castaño <castano@ludicon.com>
     SPDX-FileCopyrightText: 2015 Alex Merry <alex.merry@kde.org>
-    SPDX-FileCopyrightText: 2022 Mirco Miranda <mircomir@outlook.com>
+    SPDX-FileCopyrightText: 2022-2023 Mirco Miranda <mircomir@outlook.com>
 
     SPDX-License-Identifier: LGPL-2.0-or-later
 */
 
 /*
- * This code is based on Thacher Ulrich PSD loading code released
- * into the public domain. See: http://tulrich.com/geekstuff/
+ * The early version of this code was based on Thacher Ulrich PSD loading code
+ * released into the public domain. See: http://tulrich.com/geekstuff/
  */
 
 /*
@@ -21,7 +21,6 @@
 /*
  * Limitations of the current code:
  * - 32-bit float image are converted to 16-bit integer image.
- *   NOTE: Qt 6.2 allow 32-bit float images (RGB only)
  * - Other color spaces cannot directly be read due to lack of QImage support for
  *   color spaces other than RGB (and Grayscale). Where possible, a conversion
  *   to RGB is done:
@@ -33,8 +32,8 @@
  *   color management engine (e.g. LittleCMS).
  */
 
+#include "fastmath_p.h"
 #include "psd_p.h"
-
 #include "util_p.h"
 
 #include <QDataStream>
@@ -52,7 +51,7 @@ typedef quint8 uchar;
  * This should not be a problem because the Qt's QColorSpace supports the linear
  * sRgb colorspace.
  *
- * Using linear conversion, the loading speed is improved by 4x. Anyway, if you are using
+ * Using linear conversion, the loading speed is slightly improved. Anyway, if you are using
  * an software that discard color info, you should comment it.
  *
  * At the time I'm writing (07/2022), Gwenview and Krita supports linear sRgb but KDE
@@ -173,7 +172,8 @@ struct PSDLayerAndMaskSection {
         if (globalLayerMaskInfo.size > -1) {
             currentSize += globalLayerMaskInfo.size + 4;
         }
-        for (auto && v : additionalLayerInfo.values()) {
+        auto aliv = additionalLayerInfo.values();
+        for (auto &&v : aliv) {
             currentSize += (12 + v.size);
             if (v.signature == S_8B64)
                 currentSize += 4;
@@ -287,12 +287,6 @@ static PSDImageResourceSection readImageResourceSection(QDataStream &s, bool *ok
     qint32 sectioSize;
     s >> sectioSize;
 
-#ifdef QT_DEBUG
-    auto pos = qint64();
-    if (auto dev = s.device())
-        pos = dev->pos();
-#endif
-
     // Reading Image resource block
     for (auto size = sectioSize; size > 0;) {
         // Length      Description
@@ -357,14 +351,6 @@ static PSDImageResourceSection readImageResourceSection(QDataStream &s, bool *ok
         irs.insert(id, irb);
     }
 
-#ifdef QT_DEBUG
-    if (auto dev = s.device()) {
-        if ((dev->pos() - pos) != sectioSize) {
-            *ok = false;
-        }
-    }
-#endif
-
     return irs;
 }
 
@@ -644,7 +630,9 @@ static bool IsValid(const PSDHeader &header)
         qDebug() << "PSD header: invalid color mode" << header.color_mode;
         return false;
     }
-    if (header.channel_count < 1 || header.channel_count > 56) {
+    // Specs tells: "Supported range is 1 to 56" but the limit is 57:
+    // Photoshop does not make you add more (see also 53alphas.psd test case).
+    if (header.channel_count < 1 || header.channel_count > 57) {
         qDebug() << "PSD header: invalid number of channels" << header.channel_count;
         return false;
     }
@@ -658,6 +646,9 @@ static bool IsValid(const PSDHeader &header)
 // Check that the header is supported by this plugin.
 static bool IsSupported(const PSDHeader &header)
 {
+    if (!IsValid(header)) {
+        return false;
+    }
     if (header.version != 1 && header.version != 2) {
         return false;
     }
@@ -672,10 +663,15 @@ static bool IsSupported(const PSDHeader &header)
         header.color_mode != CM_INDEXED &&
         header.color_mode != CM_DUOTONE &&
         header.color_mode != CM_CMYK &&
+        header.color_mode != CM_MULTICHANNEL &&
         header.color_mode != CM_LABCOLOR &&
         header.color_mode != CM_BITMAP) {
         return false;
     }
+    if (header.color_mode == CM_MULTICHANNEL &&
+        header.channel_count < 4) {
+        return false;
+    }
     return true;
 }
 
@@ -737,17 +733,18 @@ static QImage::Format imageFormat(const PSDHeader &header, bool alpha)
     switch(header.color_mode) {
     case CM_RGB:
         if (header.depth == 16 || header.depth == 32)
-            format = header.channel_count < 4 || !alpha ? QImage::Format_RGBX64 : QImage::Format_RGBA64;
+            format = header.channel_count < 4 || !alpha ? QImage::Format_RGBX64 : QImage::Format_RGBA64_Premultiplied;
         else
-            format = header.channel_count < 4 || !alpha ? QImage::Format_RGB888 : QImage::Format_RGBA8888;
+            format = header.channel_count < 4 || !alpha ? QImage::Format_RGB888 : QImage::Format_RGBA8888_Premultiplied;
         break;
-    case CM_CMYK:       // Photoshop supports CMYK 8-bits and 16-bits only
+    case CM_MULTICHANNEL:       // Treat MCH as CMYK (number of channel check is done in IsSupported())
+    case CM_CMYK:               // Photoshop supports CMYK/MCH 8-bits and 16-bits only
         if (header.depth == 16)
             format = header.channel_count < 5 || !alpha ? QImage::Format_RGBX64 : QImage::Format_RGBA64;
         else if (header.depth == 8)
             format = header.channel_count < 5 || !alpha ? QImage::Format_RGB888 : QImage::Format_RGBA8888;
         break;
-    case CM_LABCOLOR:   // Photoshop supports LAB 8-bits and 16-bits only
+    case CM_LABCOLOR:           // Photoshop supports LAB 8-bits and 16-bits only
         if (header.depth == 16)
             format = header.channel_count < 4 || !alpha ? QImage::Format_RGBX64 : QImage::Format_RGBA64;
         else if (header.depth == 8)
@@ -817,7 +814,7 @@ inline void planarToChunchy(uchar *target, const char *source, qint32 width, qin
     auto s = reinterpret_cast<const T*>(source);
     auto t = reinterpret_cast<T*>(target);
     for (qint32 x = 0; x < width; ++x) {
-        t[x*cn+c] = xchg(s[x]);
+        t[x * cn + c] = xchg(s[x]);
     }
 }
 
@@ -829,7 +826,44 @@ inline void planarToChunchyFloat(uchar *target, const char *source, qint32 width
     for (qint32 x = 0; x < width; ++x) {
         auto tmp = xchg(s[x]);
         auto ftmp = (*reinterpret_cast<float*>(&tmp) - double(min)) / (double(max) - double(min));
-        t[x*cn+c] = quint16(std::min(ftmp * std::numeric_limits<quint16>::max() + 0.5, double(std::numeric_limits<quint16>::max())));
+        t[x * cn + c] = quint16(std::min(ftmp * std::numeric_limits<quint16>::max() + 0.5, double(std::numeric_limits<quint16>::max())));
+    }
+}
+
+enum class PremulConversion {
+    PS2P, // Photoshop premul to qimage premul (required by RGB)
+    PS2A, // Photoshop premul to unassociated alpha (required by RGB, CMYK and L* components of LAB)
+    PSLab2A // Photoshop premul to unassociated alpha (required by a* and b* components of LAB)
+};
+
+template<class T>
+inline void premulConversion(char *stride, qint32 width, qint32 ac, qint32 cn, const PremulConversion &conv)
+{
+    auto s = reinterpret_cast<T *>(stride);
+    auto max = qint64(std::numeric_limits<T>::max());
+
+    for (qint32 c = 0; c < ac; ++c) {
+        if (conv == PremulConversion::PS2P) {
+            for (qint32 x = 0; x < width; ++x) {
+                auto xcn = x * cn;
+                auto alpha = *(s + xcn + ac);
+                *(s + xcn + c) = *(s + xcn + c) + alpha - max;
+            }
+        } else if (conv == PremulConversion::PS2A || (conv == PremulConversion::PSLab2A && c == 0)) {
+            for (qint32 x = 0; x < width; ++x) {
+                auto xcn = x * cn;
+                auto alpha = *(s + xcn + ac);
+                if (alpha > 0)
+                    *(s + xcn + c) = ((*(s + xcn + c) + alpha - max) * max + alpha / 2) / alpha;
+            }
+        } else if (conv == PremulConversion::PSLab2A) {
+            for (qint32 x = 0; x < width; ++x) {
+                auto xcn = x * cn;
+                auto alpha = *(s + xcn + ac);
+                if (alpha > 0)
+                    *(s + xcn + c) = ((*(s + xcn + c) + (alpha - max + 1) / 2) * max + alpha / 2) / alpha;
+            }
+        }
     }
 }
 
@@ -842,12 +876,25 @@ inline void monoInvert(uchar *target, const char* source, qint32 bytes)
     }
 }
 
+template<class T>
+inline void rawChannelsCopy(uchar *target, qint32 targetChannels, const char *source, qint32 sourceChannels, qint32 width)
+{
+    auto s = reinterpret_cast<const T *>(source);
+    auto t = reinterpret_cast<T *>(target);
+    for (qint32 c = 0, cs = std::min(targetChannels, sourceChannels); c < cs; ++c) {
+        for (qint32 x = 0; x < width; ++x) {
+            t[x * targetChannels + c] = s[x * sourceChannels + c];
+        }
+    }
+}
+
 template<class T>
 inline void cmykToRgb(uchar *target, qint32 targetChannels, const char *source, qint32 sourceChannels, qint32 width, bool alpha = false)
 {
     auto s = reinterpret_cast<const T*>(source);
     auto t = reinterpret_cast<T*>(target);
     auto max = double(std::numeric_limits<T>::max());
+    auto invmax = 1.0 / max; // speed improvements by ~10%
 
     if (sourceChannels < 4) {
         qDebug() << "cmykToRgb: image is not a valid CMYK!";
@@ -856,10 +903,10 @@ inline void cmykToRgb(uchar *target, qint32 targetChannels, const char *source,
 
     for (qint32 w = 0; w < width; ++w) {
         auto ps = s + sourceChannels * w;
-        auto C = 1 - *(ps + 0) / max;
-        auto M = 1 - *(ps + 1) / max;
-        auto Y = 1 - *(ps + 2) / max;
-        auto K = 1 - *(ps + 3) / max;
+        auto C = 1 - *(ps + 0) * invmax;
+        auto M = 1 - *(ps + 1) * invmax;
+        auto Y = 1 - *(ps + 2) * invmax;
+        auto K = 1 - *(ps + 3) * invmax;
 
         auto pt = t + targetChannels * w;
         *(pt + 0) = T(std::min(max - (C * (1 - K) + K) * max + 0.5, max));
@@ -884,8 +931,9 @@ inline double gammaCorrection(double linear)
 #ifdef PSD_FAST_LAB_CONVERSION
     return linear;
 #else
-    // NOTE: pow() slow down the performance by a 4 factor :(
-    return (linear > 0.0031308 ? 1.055 * std::pow(linear, 1.0 / 2.4) - 0.055 : 12.92 * linear);
+    // Replacing fastPow with std::pow the conversion time is 2/3 times longer: using fastPow
+    // there are minimal differences in the conversion that are not visually noticeable.
+    return (linear > 0.0031308 ? 1.055 * fastPow(linear, 1.0 / 2.4) - 0.055 : 12.92 * linear);
 #endif
 }
 
@@ -895,6 +943,7 @@ inline void labToRgb(uchar *target, qint32 targetChannels, const char *source, q
     auto s = reinterpret_cast<const T*>(source);
     auto t = reinterpret_cast<T*>(target);
     auto max = double(std::numeric_limits<T>::max());
+    auto invmax = 1.0 / max;
 
     if (sourceChannels < 3) {
         qDebug() << "labToRgb: image is not a valid LAB!";
@@ -903,14 +952,14 @@ inline void labToRgb(uchar *target, qint32 targetChannels, const char *source, q
 
     for (qint32 w = 0; w < width; ++w) {
         auto ps = s + sourceChannels * w;
-        auto L = (*(ps + 0) / max) * 100.0;
-        auto A = (*(ps + 1) / max) * 255.0 - 128.0;
-        auto B = (*(ps + 2) / max) * 255.0 - 128.0;
+        auto L = (*(ps + 0) * invmax) * 100.0;
+        auto A = (*(ps + 1) * invmax) * 255.0 - 128.0;
+        auto B = (*(ps + 2) * invmax) * 255.0 - 128.0;
 
         // converting LAB to XYZ (D65 illuminant)
-        auto Y = (L + 16.0) / 116.0;
-        auto X = A / 500.0 + Y;
-        auto Z = Y - B / 200.0;
+        auto Y = (L + 16.0) * (1.0 / 116.0);
+        auto X = A * (1.0 / 500.0) + Y;
+        auto Z = Y - B * (1.0 / 200.0);
 
         // NOTE: use the constants of the illuminant of the target RGB color space
         X = finv(X) * 0.9504;   // D50: * 0.9642
@@ -1013,7 +1062,7 @@ static bool LoadPSD(QDataStream &stream, const PSDHeader &header, QImage &img)
         return false;
     }
 
-    img = QImage(header.width, header.height, format);
+    img = imageAlloc(header.width, header.height, format);
     if (img.isNull()) {
         qWarning() << "Failed to allocate image, invalid dimensions?" << QSize(header.width, header.height);
         return false;
@@ -1060,7 +1109,15 @@ static bool LoadPSD(QDataStream &stream, const PSDHeader &header, QImage &img)
     QByteArray rawStride;
     rawStride.resize(raw_count);
 
-    if (header.color_mode == CM_CMYK || header.color_mode == CM_LABCOLOR || header.color_mode == CM_MULTICHANNEL) {
+    // clang-format off
+    // checks the need of color conversion (that requires random access to the image)
+    auto randomAccess = (header.color_mode == CM_CMYK) ||
+        (header.color_mode == CM_LABCOLOR) ||
+        (header.color_mode == CM_MULTICHANNEL) ||
+        (header.color_mode != CM_INDEXED && img.hasAlphaChannel());
+    // clang-format on
+
+    if (randomAccess) {
         // In order to make a colorspace transformation, we need all channels of a scanline
         QByteArray psdScanline;
         psdScanline.resize(qsizetype(header.width * std::min(header.depth, quint16(16)) * header.channel_count + 7) / 8);
@@ -1080,31 +1137,56 @@ static bool LoadPSD(QDataStream &stream, const PSDHeader &header, QImage &img)
                 auto scanLine = reinterpret_cast<unsigned char*>(psdScanline.data());
                 if (header.depth == 8) {
                     planarToChunchy<quint8>(scanLine, rawStride.data(), header.width, c, header.channel_count);
-                }
-                else if (header.depth == 16) {
+                } else if (header.depth == 16) {
                     planarToChunchy<quint16>(scanLine, rawStride.data(), header.width, c, header.channel_count);
-                }
-                else if (header.depth == 32) { // Not currently used
+                } else if (header.depth == 32) {
                     planarToChunchyFloat<quint32>(scanLine, rawStride.data(), header.width, c, header.channel_count);
                 }
             }
 
+            // Convert premultiplied data to unassociated data
+            if (img.hasAlphaChannel()) {
+                if (header.color_mode == CM_CMYK) {
+                    if (header.depth == 8)
+                        premulConversion<quint8>(psdScanline.data(), header.width, 4, header.channel_count, PremulConversion::PS2A);
+                    else if (header.depth == 16)
+                        premulConversion<quint16>(psdScanline.data(), header.width, 4, header.channel_count, PremulConversion::PS2A);
+                }
+                if (header.color_mode == CM_LABCOLOR) {
+                    if (header.depth == 8)
+                        premulConversion<quint8>(psdScanline.data(), header.width, 3, header.channel_count, PremulConversion::PSLab2A);
+                    else if (header.depth == 16)
+                        premulConversion<quint16>(psdScanline.data(), header.width, 3, header.channel_count, PremulConversion::PSLab2A);
+                }
+                if (header.color_mode == CM_RGB) {
+                    if (header.depth == 8)
+                        premulConversion<quint8>(psdScanline.data(), header.width, 3, header.channel_count, PremulConversion::PS2P);
+                    else if (header.depth == 16 || header.depth == 32)
+                        premulConversion<quint16>(psdScanline.data(), header.width, 3, header.channel_count, PremulConversion::PS2P);
+                }
+            }
+
             // Conversion to RGB
-            if (header.color_mode == CM_CMYK) {
+            if (header.color_mode == CM_CMYK || header.color_mode == CM_MULTICHANNEL) {
                 if (header.depth == 8)
                     cmykToRgb<quint8>(img.scanLine(y), imgChannels, psdScanline.data(), header.channel_count, header.width, alpha);
-                else
+                else if (header.depth == 16)
                     cmykToRgb<quint16>(img.scanLine(y), imgChannels, psdScanline.data(), header.channel_count, header.width, alpha);
             }
             if (header.color_mode == CM_LABCOLOR) {
                 if (header.depth == 8)
                     labToRgb<quint8>(img.scanLine(y), imgChannels, psdScanline.data(), header.channel_count, header.width, alpha);
-                else
+                else if (header.depth == 16)
                     labToRgb<quint16>(img.scanLine(y), imgChannels, psdScanline.data(), header.channel_count, header.width, alpha);
             }
+            if (header.color_mode == CM_RGB) {
+                if (header.depth == 8)
+                    rawChannelsCopy<quint8>(img.scanLine(y), imgChannels, psdScanline.data(), header.channel_count, header.width);
+                else if (header.depth == 16 || header.depth == 32)
+                    rawChannelsCopy<quint16>(img.scanLine(y), imgChannels, psdScanline.data(), header.channel_count, header.width);
+            }
         }
-    }
-    else {
+    } else {
         // Linear read (no position jumps): optimized code usable only for the colorspaces supported by QImage
         for (qint32 c = 0; c < channel_num; ++c) {
             for (qint32 y = 0, h = header.height; y < h; ++y) {
@@ -1115,16 +1197,13 @@ static bool LoadPSD(QDataStream &stream, const PSDHeader &header, QImage &img)
                 }
 
                 auto scanLine = img.scanLine(y);
-                if (header.depth == 1) {        // Bitmap
+                if (header.depth == 1) { // Bitmap
                     monoInvert(scanLine, rawStride.data(), std::min(rawStride.size(), img.bytesPerLine()));
-                }
-                else if (header.depth == 8) {   // 8-bits images: Indexed, Grayscale, RGB/RGBA
+                } else if (header.depth == 8) { // 8-bits images: Indexed, Grayscale, RGB/RGBA
                     planarToChunchy<quint8>(scanLine, rawStride.data(), header.width, c, imgChannels);
-                }
-                else if (header.depth == 16) {  // 16-bits integer images: Grayscale, RGB/RGBA
+                } else if (header.depth == 16) { // 16-bits integer images: Grayscale, RGB/RGBA
                     planarToChunchy<quint16>(scanLine, rawStride.data(), header.width, c, imgChannels);
-                }
-                else if (header.depth == 32) {  // 32-bits float images: Grayscale, RGB/RGBA (coverted to equivalent integer 16-bits)
+                } else if (header.depth == 32) { // 32-bits float images: Grayscale, RGB/RGBA (coverted to equivalent integer 16-bits)
                     planarToChunchyFloat<quint32>(scanLine, rawStride.data(), header.width, c, imgChannels);
                 }
             }
@@ -1249,35 +1328,30 @@ bool PSDHandler::canRead(QIODevice *device)
         return false;
     }
 
-    qint64 oldPos = device->pos();
+    device->startTransaction();
 
-    char head[4];
-    qint64 readBytes = device->read(head, sizeof(head));
-    if (readBytes < 0) {
-        qWarning() << "Read failed" << device->errorString();
-        return false;
-    }
+    QDataStream s(device);
+    s.setByteOrder(QDataStream::BigEndian);
 
-    if (readBytes != sizeof(head)) {
-        if (device->isSequential()) {
-            while (readBytes > 0) {
-                device->ungetChar(head[readBytes-- - 1]);
-            }
-        } else {
-            device->seek(oldPos);
-        }
+    PSDHeader header;
+    s >> header;
+
+    device->rollbackTransaction();
+
+    if (s.status() != QDataStream::Ok) {
         return false;
     }
 
     if (device->isSequential()) {
-        while (readBytes > 0) {
-            device->ungetChar(head[readBytes-- - 1]);
+        if (header.color_mode == CM_CMYK || header.color_mode == CM_LABCOLOR || header.color_mode == CM_MULTICHANNEL) {
+            return false;
+        }
+        if (header.color_mode == CM_RGB && header.channel_count > 3) {
+            return false; // supposing extra channel as alpha
         }
-    } else {
-        device->seek(oldPos);
     }
 
-    return qstrncmp(head, "8BPS", 4) == 0;
+    return IsSupported(header);
 }
 
 QImageIOPlugin::Capabilities PSDPlugin::capabilities(QIODevice *device, const QByteArray &format) const

src/imageformats/ras.cpp

@@ -8,7 +8,6 @@
 */
 
 #include "ras_p.h"
-
 #include "util_p.h"
 
 #include <QDataStream>
@@ -152,8 +151,7 @@ static bool LoadRAS(QDataStream &s, const RasHeader &ras, QImage &img)
     }
 
     // Allocate image
-    img = QImage(ras.Width, ras.Height, QImage::Format_ARGB32);
-
+    img = imageAlloc(ras.Width, ras.Height, QImage::Format_ARGB32);
     if (img.isNull()) {
         return false;
     }

src/imageformats/raw.cpp

@@ -0,0 +1,912 @@
+/*
+    RAW support for QImage.
+
+    SPDX-FileCopyrightText: 2022 Mirco Miranda <mircomir@outlook.com>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
+
+#include "raw_p.h"
+#include "util_p.h"
+
+#include <QColorSpace>
+#include <QDateTime>
+#include <QDebug>
+#include <QImage>
+#include <QSet>
+
+#if defined(Q_OS_WINDOWS) && !defined(NOMINMAX)
+#define NOMINMAX
+#endif
+
+#include <libraw/libraw.h>
+
+#ifdef QT_DEBUG
+// This should be used to exclude the local QIODevice wrapper of the LibRaw_abstract_datastream interface.
+// If the result changes then the problem is in the local wrapper and must be corrected.
+// WARNING: using the LibRaw's streams instead of the local wrapper from a Qt program falls in the LOCALE
+//          bug when the RAW file needs the scanf_one() function (e.g. *.MOS files). See also raw_scanf_one().
+//#define EXCLUDE_LibRaw_QIODevice // Uncomment this code if you think that the problem is LibRaw_QIODevice (default commented)
+#endif
+
+namespace // Private.
+{
+
+// smart pointer for processed image
+using pi_unique_ptr = std::unique_ptr<libraw_processed_image_t, std::function<void(libraw_processed_image_t *)>>;
+
+// clang-format off
+// Known formats supported by LibRaw (in alphabetical order and lower case)
+const auto supported_formats = QSet<QByteArray>{
+    "3fr",
+    "arw", "arq",
+    "bay", "bmq",
+    "cr2", "cr3", "cap", "cine", "cs1", "crw",
+    "dcs", "dc2", "dcr", "dng", "drf", "dxo",
+    "eip", "erf",
+    "fff",
+    "iiq",
+    "k25", "kc2", "kdc",
+    "mdc", "mef", "mfw", "mos", "mrw",
+    "nef", "nrw",
+    "obm", "orf", "ori",
+    "pef", "ptx", "pxn",
+    "qtk",
+    "r3d", "raf", "raw", "rdc", "rw2", "rwl", "rwz",
+    "sr2", "srf", "srw", "sti",
+    "x3f"
+};
+// clang-format on
+
+inline int raw_scanf_one(const QByteArray &ba, const char *fmt, void *val)
+{
+    // WARNING: Here it would be nice to use sscanf like LibRaw does but there
+    //          is a Big Trouble: THE LOCALE! LibRaw is also affected by the
+    //          issue if used in a Qt program:
+    //          If you use sscanf here the conversion is wrong when performed
+    //          with Italian locale (where the decimal separator is the comma).
+    // The solution should be to use std::locale::global() but it's global!
+    // I don't want to do it. So, don't use code like that:
+    // return sscanf(QByteArray(ba).append('\0').data(), fmt, val);
+
+    // LibRaw is asking only "%d" and "%f" for now. This code is not affected
+    // by the LOCALE bug.
+    auto s = QString::fromLatin1(ba);
+    if (strcmp(fmt, "%d") == 0) {
+        auto ok = false;
+        auto d = QLocale::c().toInt(s, &ok);
+        if (!ok) {
+            return EOF;
+        }
+        *(static_cast<int *>(val)) = d;
+    } else {
+        auto ok = false;
+        auto f = QLocale::c().toFloat(s, &ok);
+        if (!ok) {
+            return EOF;
+        }
+        *(static_cast<float *>(val)) = f;
+    }
+    return 1;
+}
+
+/**
+ * @brief The LibRaw_QIODevice class
+ * Implementation of the LibRaw stream interface over a QIODevice.
+ */
+class LibRaw_QIODevice : public LibRaw_abstract_datastream
+{
+public:
+    explicit LibRaw_QIODevice(QIODevice *device)
+    {
+        m_device = device;
+    }
+    virtual ~LibRaw_QIODevice() override
+    {
+    }
+    virtual int valid() override
+    {
+        return m_device != nullptr;
+    }
+    virtual int read(void *ptr, size_t sz, size_t nmemb) override
+    {
+        qint64 read = 0;
+        if (sz == 0) {
+            return 0;
+        }
+        auto data = reinterpret_cast<char*>(ptr);
+        for (qint64 r = 0, size = sz * nmemb; read < size; read += r) {
+            if (m_device->atEnd()) {
+                break;
+            }
+            r = m_device->read(data + read, size - read);
+            if (r < 1) {
+                break;
+            }
+        }
+        return read / sz;
+    }
+    virtual int eof() override
+    {
+        return m_device->atEnd() ? 1 : 0;
+    }
+    virtual int seek(INT64 o, int whence) override
+    {
+        auto pos = o;
+        auto size = m_device->size();
+        if (whence == SEEK_CUR) {
+            pos = m_device->pos() + o;
+        }
+        if (whence == SEEK_END) {
+            pos = size + o;
+        }
+        if (pos < 0 || m_device->isSequential()) {
+            return -1;
+        }
+        return m_device->seek(pos) ? 0 : -1;
+    }
+    virtual INT64 tell() override
+    {
+        return m_device->pos();
+    }
+    virtual INT64 size() override
+    {
+        return m_device->size();
+    }
+    virtual char *gets(char *s, int sz) override
+    {
+        if (m_device->readLine(s, sz) > 0) {
+            return s;
+        }
+        return nullptr;
+    }
+    virtual int scanf_one(const char *fmt, void *val) override
+    {
+        QByteArray ba;
+        for (int xcnt = 0; xcnt < 24 && !m_device->atEnd(); ++xcnt) {
+            char c;
+            if (!m_device->getChar(&c)) {
+                return EOF;
+            }
+            if (ba.isEmpty() && (c == ' ' || c == '\t')) {
+                continue;
+            }
+            if (c == '\0' || c == ' ' || c == '\t' || c == '\n') {
+                break;
+            }
+            ba.append(c);
+        }
+        return raw_scanf_one(ba, fmt, val);
+    }
+    virtual int get_char() override
+    {
+        unsigned char c;
+        if (!m_device->getChar(reinterpret_cast<char *>(&c))) {
+            return EOF;
+        }
+        return int(c);
+    }
+#if (LIBRAW_VERSION < LIBRAW_MAKE_VERSION(0, 21, 0)) || defined(LIBRAW_OLD_VIDEO_SUPPORT)
+    virtual void *make_jas_stream() override
+    {
+        return nullptr;
+    }
+#endif
+
+private:
+    QIODevice *m_device;
+};
+
+bool addTag(const QString &tag, QStringList &lines)
+{
+    auto ok = !tag.isEmpty();
+    if (ok) {
+        lines << tag;
+    }
+    return ok;
+}
+
+QString createTag(QString value, const char *tag)
+{
+    if (!value.isEmpty()) {
+        value = QStringLiteral("<%1>%2</%1>").arg(QString::fromLatin1(tag), value);
+    }
+    return value;
+}
+
+QString createTag(char *asciiz, const char *tag)
+{
+    auto value = QString::fromUtf8(asciiz);
+    return createTag(value, tag);
+}
+
+QString createTimeTag(time_t time, const char *tag)
+{
+    auto value = QDateTime::fromSecsSinceEpoch(time, Qt::UTC);
+    if (value.isValid() && time > 0) {
+        return createTag(value.toString(Qt::ISODate), tag);
+    }
+    return QString();
+}
+
+QString createFlashTag(short flash, const char *tag)
+{
+    QStringList l;
+    auto lc = QLocale::c();
+    // EXIF specifications
+    auto t = QStringLiteral("true");
+    auto f = QStringLiteral("false");
+    l << QStringLiteral("<exif:Fired>%1</exif:Fired>").arg((flash & 1) ? t : f);
+    l << QStringLiteral("<exif:Function>%1</exif:Function>").arg((flash & (1 << 5)) ? t : f);
+    l << QStringLiteral("<exif:RedEyeMode>%1</exif:RedEyeMode>").arg((flash & (1 << 6)) ? t : f);
+    l << QStringLiteral("<exif:Mode>%1</exif:Mode>").arg(lc.toString((int(flash) >> 3) & 3));
+    l << QStringLiteral("<exif:Return>%1</exif:Return>").arg(lc.toString((int(flash) >> 1) & 3));
+    return createTag(l.join(QChar()), tag);
+}
+
+QString createTag(quint64 n, const char *tag, quint64 invalid = 0)
+{
+    if (n != invalid) {
+        return createTag(QLocale::c().toString(n), tag);
+    }
+    return QString();
+}
+
+QString createTag(qint16 n, const char *tag, qint16 invalid = 0)
+{
+    if (n != invalid) {
+        return createTag(QLocale::c().toString(n), tag);
+    }
+    return QString();
+}
+
+QString createTag(quint16 n, const char *tag, quint16 invalid = 0)
+{
+    if (n != invalid) {
+        return createTag(QLocale::c().toString(n), tag);
+    }
+    return QString();
+}
+
+QString createTag(float f, const char *tag, qint32 mul = 1)
+{
+    if (f != 0) {
+        if (mul > 1)
+            return QStringLiteral("<%1>%2/%3</%1>").arg(QString::fromLatin1(tag), QLocale::c().toString(int(f * mul))).arg(mul);
+        return QStringLiteral("<%1>%2</%1>").arg(QString::fromLatin1(tag), QLocale::c().toString(f));
+    }
+    return QString();
+}
+
+QString createTag(libraw_gps_info_t gps, const char *tag)
+{
+    auto tmp = QString::fromLatin1(tag);
+    if (tmp.contains(QStringLiteral("Latitude"), Qt::CaseInsensitive)) {
+        if (gps.latref != '\0') {
+            auto lc = QLocale::c();
+            auto value = QStringLiteral("%1,%2%3")
+                             .arg(lc.toString(gps.latitude[0], 'f', 0))
+                             .arg(lc.toString(gps.latitude[1] + gps.latitude[2] / 60, 'f', 4))
+                             .arg(QChar::fromLatin1(gps.latref));
+            return createTag(value, tag);
+        }
+    }
+    if (tmp.contains(QStringLiteral("Longitude"), Qt::CaseInsensitive)) {
+        if (gps.longref != '\0') {
+            auto lc = QLocale::c();
+            auto value = QStringLiteral("%1,%2%3")
+                             .arg(lc.toString(gps.longitude[0], 'f', 0))
+                             .arg(lc.toString(gps.longitude[1] + gps.longitude[2] / 60, 'f', 4))
+                             .arg(QChar::fromLatin1(gps.longref));
+            return createTag(value, tag);
+        }
+    }
+    if (tmp.contains(QStringLiteral("Altitude"), Qt::CaseInsensitive)) {
+        if (gps.altitude != 0) {
+            return createTag(gps.altitude, tag, 1000);
+        }
+    }
+    return QString();
+}
+
+QString createXmpPacket()
+{
+    QStringList lines;
+    lines << QStringLiteral("<?xpacket begin=\"\" id=\"W5M0MpCehiHzreSzNTczkc9d\"?>");
+    lines << QStringLiteral("<x:xmpmeta xmlns:x=\"adobe:ns:meta/\" x:xmptk=\"KIMG RAW Plugin\">");
+    lines << QStringLiteral("<rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\">");
+    lines << QStringLiteral("</rdf:RDF>");
+    lines << QStringLiteral("</x:xmpmeta>");
+    for (auto i = 30; i > 0; --i)
+        lines << QString::fromLatin1(QByteArray(80, ' '));
+    lines << QStringLiteral("<?xpacket end=\"w\"?>");
+    return lines.join(QChar::fromLatin1('\n'));
+}
+
+QString updateXmpPacket(const QString &xmpPacket, LibRaw *rawProcessor)
+{
+    auto rdfEnd = xmpPacket.indexOf(QStringLiteral("</rdf:RDF>"), Qt::CaseInsensitive);
+    if (rdfEnd < 0) {
+        return updateXmpPacket(createXmpPacket(), rawProcessor);
+    }
+
+    auto lines = QStringList() << xmpPacket.left(rdfEnd);
+    lines << QStringLiteral("<rdf:Description rdf:about=\"\"");
+    lines << QStringLiteral("      xmlns:xmp=\"http://ns.adobe.com/xap/1.0/\"");
+    lines << QStringLiteral("      xmlns:dc=\"http://purl.org/dc/elements/1.1/\"");
+    lines << QStringLiteral("      xmlns:aux=\"http://ns.adobe.com/exif/1.0/aux/\"");
+    lines << QStringLiteral("      xmlns:xmpMM=\"http://ns.adobe.com/xap/1.0/mm/\"");
+    lines << QStringLiteral("      xmlns:stEvt=\"http://ns.adobe.com/xap/1.0/sType/ResourceEvent#\"");
+    lines << QStringLiteral("      xmlns:stRef=\"http://ns.adobe.com/xap/1.0/sType/ResourceRef#\"");
+    lines << QStringLiteral("      xmlns:tiff=\"http://ns.adobe.com/tiff/1.0/\"");
+    lines << QStringLiteral("      xmlns:exif=\"http://ns.adobe.com/exif/1.0/\"");
+    lines << QStringLiteral("      xmlns:xmpRights=\"http://ns.adobe.com/xap/1.0/rights/\">");
+    lines << QStringLiteral("<xmpMM:History>");
+    lines << QStringLiteral("<rdf:Seq>");
+    lines << QStringLiteral("<rdf:li rdf:parseType=\"Resource\">");
+    lines << QStringLiteral("<stEvt:action>converted</stEvt:action>");
+    lines << QStringLiteral("<stEvt:parameters>Converted from RAW to Qt Image using KIMG RAW plugin</stEvt:parameters>");
+    lines << QStringLiteral("<stEvt:softwareAgent>LibRaw %1</stEvt:softwareAgent>").arg(QString::fromLatin1(LibRaw::version()));
+    lines << QStringLiteral("<stEvt:when>%1</stEvt:when>").arg(QDateTime::currentDateTimeUtc().toString(Qt::ISODate));
+    lines << QStringLiteral("</rdf:li>");
+    lines << QStringLiteral("</rdf:Seq>");
+    lines << QStringLiteral("</xmpMM:History>");
+
+    auto &&iparams = rawProcessor->imgdata.idata;
+    addTag(createTag(iparams.normalized_model, "tiff:Model"), lines);
+    addTag(createTag(iparams.normalized_make, "tiff:Make"), lines);
+    addTag(createTag(iparams.software, "xmp:CreatorTool"), lines);
+
+    auto &&iother = rawProcessor->imgdata.other;
+    addTag(createTag(createTag(createTag(iother.desc, "rdf:li"), "rdf:Alt"), "dc:description"), lines);
+    addTag(createTag(createTag(createTag(iother.artist, "rdf:li"), "rdf:Seq"), "dc:creator"), lines);
+    addTag(createTag(createTag(createTag(iother.iso_speed, "rdf:li"), "rdf:Seq"), "exif:ISOSpeedRatings"), lines);
+    addTag(createTag(iother.shutter, "exif:ExposureTime", 1000), lines);
+    addTag(createTag(iother.aperture, "exif:ApertureValue", 1000), lines);
+    addTag(createTag(iother.focal_len, "exif:FocalLength", 1000), lines);
+    addTag(createTimeTag(iother.timestamp, "xmp:CreateDate"), lines);
+    addTag(createTag(iother.parsed_gps, "exif:GPSLatitude"), lines);
+    addTag(createTag(iother.parsed_gps, "exif:GPSLongitude"), lines);
+    addTag(createTag(iother.parsed_gps, "exif:GPSAltitude"), lines);
+
+    auto &&shotinfo = rawProcessor->imgdata.shootinginfo;
+    addTag(createTag(shotinfo.ExposureMode, "exif:ExposureMode", short(-1)), lines);
+    addTag(createTag(shotinfo.MeteringMode, "exif:MeteringMode", short(-1)), lines);
+    addTag(createTag(shotinfo.BodySerial, "aux:SerialNumber"), lines);
+
+    auto &&color = rawProcessor->imgdata.color;
+    addTag(createFlashTag(color.flash_used, "exif:Flash"), lines);
+
+    auto &&lens = rawProcessor->imgdata.lens;
+    addTag(createTag(lens.FocalLengthIn35mmFormat, "exif:FocalLengthIn35mmFilm"), lines);
+    addTag(createTag(lens.Lens, "aux:Lens"), lines);
+    addTag(createTag(lens.LensSerial, "aux:LensSerialNumber"), lines);
+    addTag(createTag(lens.nikon.LensIDNumber ? quint64(lens.nikon.LensIDNumber) : lens.makernotes.LensID, "aux:LensID"), lines);
+
+    auto &&makernotes = rawProcessor->imgdata.makernotes;
+    addTag(createTag(makernotes.common.firmware, "aux:Firmware"), lines);
+
+    lines << QStringLiteral("</rdf:Description>");
+    lines << xmpPacket.mid(rdfEnd);
+
+    return lines.join(QChar::fromLatin1('\n'));
+}
+
+template<class T>
+inline void rgbToRgbX(uchar *target, const uchar *source, qint32 targetSize, qint32 sourceSize)
+{
+    auto s = reinterpret_cast<const T *>(source);
+    auto t = reinterpret_cast<T *>(target);
+    auto width = std::min(targetSize / 4, sourceSize / 3) / qint32(sizeof(T));
+    for (qint32 x = 0; x < width; ++x) {
+        t[x * 4 + 0] = s[x * 3 + 0];
+        t[x * 4 + 1] = s[x * 3 + 1];
+        t[x * 4 + 2] = s[x * 3 + 2];
+        t[x * 4 + 3] = std::numeric_limits<T>::max();
+    }
+}
+
+// clang-format off
+#define C_IQ(a) (((a) & 0xF) << 4)
+#define C_OC(a) (((a) & 0xF) << 8)
+#define C_CW(a) (((a) & 0x1) << 12)
+#define C_AW(a) (((a) & 0x1) << 13)
+#define C_BT(a) (((a) & 0x1) << 14)
+#define C_HS(a) (((a) & 0x1) << 15)
+#define C_CE(a) (((a) & 0x1) << 16)
+#define C_NR(a) (((a) & 0x3) << 17)
+#define C_FC(a) (((a) & 0x1) << 19)
+#define C_SR(a) (((a) & 0x1) << 20)
+#define C_PRESET(a) ((a) & 0xF)
+
+#define T_IQ(a) (((a) >> 4) & 0xF)
+#define T_OC(a) (((a) >> 8) & 0xF)
+#define T_CW(a) (((a) >> 12) & 0x1)
+#define T_AW(a) (((a) >> 13) & 0x1)
+#define T_BT(a) (((a) >> 14) & 0x1)
+#define T_HS(a) (((a) >> 15) & 0x1)
+#define T_CE(a) (((a) >> 16) & 0x1)
+#define T_NR(a) (((a) >> 17) & 0x3)
+#define T_FC(a) (((a) >> 19) & 0x1)
+#define T_SR(a) (((a) >> 20) & 0x1)
+#define T_PRESET(a) ((a) & 0xF)
+// clang-format on
+
+#define DEFAULT_QUALITY (C_IQ(3) | C_OC(1) | C_CW(1) | C_AW(1) | C_BT(1) | C_HS(0))
+
+void setParams(QImageIOHandler *handler, LibRaw *rawProcessor)
+{
+    // *** Set raw params
+#if (LIBRAW_VERSION < LIBRAW_MAKE_VERSION(0, 21, 0))
+    auto &&rawparams = rawProcessor->imgdata.params;
+#else
+    auto &&rawparams = rawProcessor->imgdata.rawparams;
+#endif
+    // Select one raw image from input file (0 - first, ...)
+    rawparams.shot_select = handler->currentImageNumber();
+
+    // *** Set processing parameters
+
+    // NOTE: The default value set below are the ones that gave the best results
+    // on a large sample of images (https://raw.pixls.us/data/)
+
+    /**
+     * @brief quality
+     * Plugin quality option.
+     */
+    qint32 quality = -1;
+    if (handler->supportsOption(QImageIOHandler::Quality)) {
+        quality = handler->option(QImageIOHandler::Quality).toInt();
+    }
+    if (quality < 0) {
+        quality = DEFAULT_QUALITY;
+    }
+
+    switch (T_PRESET(quality)) {
+    case 0:
+        break;
+    case 1:
+        quality = C_IQ(0) | C_OC(1) | C_CW(1) | C_AW(1) | C_BT(0) | C_HS(1);
+        break;
+    case 2:
+        quality = C_IQ(0) | C_OC(1) | C_CW(1) | C_AW(1) | C_BT(0) | C_HS(0);
+        break;
+    case 3:
+        quality = C_IQ(3) | C_OC(1) | C_CW(1) | C_AW(1) | C_BT(0) | C_HS(0);
+        break;
+    case 4:
+        quality = C_IQ(3) | C_OC(1) | C_CW(1) | C_AW(1) | C_BT(1) | C_HS(0);
+        break;
+    case 5:
+        quality = C_IQ(3) | C_OC(2) | C_CW(1) | C_AW(1) | C_BT(1) | C_HS(0);
+        break;
+    case 6:
+        quality = C_IQ(3) | C_OC(4) | C_CW(1) | C_AW(1) | C_BT(1) | C_HS(0);
+        break;
+    case 7:
+        quality = C_IQ(11) | C_OC(1) | C_CW(1) | C_AW(1) | C_BT(0) | C_HS(0);
+        break;
+    case 8:
+        quality = C_IQ(11) | C_OC(1) | C_CW(1) | C_AW(1) | C_BT(1) | C_HS(0);
+        break;
+    case 9:
+        quality = C_IQ(11) | C_OC(2) | C_CW(1) | C_AW(1) | C_BT(1) | C_HS(0);
+        break;
+    case 10:
+        quality = C_IQ(11) | C_OC(4) | C_CW(1) | C_AW(1) | C_BT(1) | C_HS(0);
+        break;
+    default:
+        quality = DEFAULT_QUALITY;
+        break;
+    }
+
+    auto &&params = rawProcessor->imgdata.params;
+
+    /**
+     * @brief use_camera_wb
+     * Use camera white balance, if possible (0 - off, 1 - on)
+     *
+     * This should to be set. Alternatively, a calibrated white balance should be set on each camera.
+     */
+    params.use_camera_wb = T_CW(quality);
+
+    /*!
+     * \brief use_auto_wb
+     * Average the whole image for white balance (0 - off, 1 - on)
+     *
+     * This is usefull if no camera white balance is available.
+     */
+    params.use_auto_wb = T_AW(quality);
+
+    /**
+     * @brief output_bps
+     * Bits per pixel (8 or 16)
+     *
+     * Professional cameras (and even some smartphones) generate images at 10 or more bits per sample.
+     * When using 16-bit images, the highest quality should be maintained.
+     */
+    params.output_bps = T_BT(quality) ? 16 : 8;
+
+    /**
+     * @brief output_color
+     * Output colorspace (0 - raw, 1 - sRGB, 2 - Adobe, 3 - Wide, 4 - ProPhoto, 5 - XYZ, 6 - ACES, 7 - DCI-P3, 8 - Rec2020)
+     *
+     * sRGB allows you to view images correctly on programs that do not support ICC profiles. When most
+     * Programs will support icc profiles, ProPhoto may be a better choice.
+     * @note sRgb is the LibRaw default: if grayscale image is loaded, LibRaw switches to 0 (Raw) automatically.
+     */
+    params.output_color = T_OC(quality);
+
+    /**
+     * @brief user_qual
+     * Interpolation quality (0 - linear, 1 - VNG, 2 - PPG, 3 - AHD, 4 - DCB, 11 - DHT, 12 - AAHD)
+     *
+     * DHT seems the best option - See In-Depth Demosaicing Algorithm Analysis (https://www.libraw.org/node/2306)
+     * but, when used, some FUJI RAF files of my library are poorly rendered (e.g. completely green). This is the
+     * why I used AHD: a good compromise between quality and performance with no rendering errors.
+     */
+    params.user_qual = T_IQ(quality);
+
+    /**
+     * @brief half_size
+     * Generate an half-size image (0 - off, 1 - on)
+     *
+     * Very fast and useful for generating previews.
+     */
+    params.half_size = T_HS(quality);
+
+    /**
+     * @dcb_enhance_fl
+     * DCB color enhance filter (0 - off, 1 - on)
+     */
+    params.dcb_enhance_fl = T_CE(quality);
+
+    /**
+     * @fbdd_noiserd
+     * FBDD noise reduction (0 - off, 1 - light, 2 - full)
+     */
+    params.fbdd_noiserd = std::min(2, T_NR(quality));
+
+    /**
+     * @four_color_rgb
+     * Interpolate RGGB as four colors (0 - off, 1 - on)
+     */
+    params.four_color_rgb = T_FC(quality);
+
+    /**
+     * @use_fuji_rotate
+     * Don't stretch or rotate raw pixels (0 - off, 1 - on)
+     */
+    params.use_fuji_rotate = T_SR(quality) ? 0 : 1;
+}
+
+bool LoadRAW(QImageIOHandler *handler, QImage &img)
+{
+    std::unique_ptr<LibRaw> rawProcessor(new LibRaw);
+
+    // *** Set parameters
+    setParams(handler, rawProcessor.get());
+
+    // *** Open the stream
+    auto device = handler->device();
+#ifndef EXCLUDE_LibRaw_QIODevice
+    LibRaw_QIODevice stream(device);
+    if (rawProcessor->open_datastream(&stream) != LIBRAW_SUCCESS) {
+        return false;
+    }
+#else
+    auto ba = device->readAll();
+    if (rawProcessor->open_buffer(ba.data(), ba.size()) != LIBRAW_SUCCESS) {
+        return false;
+    }
+#endif
+
+    // *** Unpacking selected image
+    if (rawProcessor->unpack() != LIBRAW_SUCCESS) {
+        return false;
+    }
+
+    // *** Process selected image
+    if (rawProcessor->dcraw_process() != LIBRAW_SUCCESS) {
+        return false;
+    }
+
+    // *** Convert to QImage
+    pi_unique_ptr processedImage(rawProcessor->dcraw_make_mem_image(), LibRaw::dcraw_clear_mem);
+    if (processedImage == nullptr) {
+        return false;
+    }
+
+    // clang-format off
+    if ((processedImage->type != LIBRAW_IMAGE_BITMAP) ||
+        (processedImage->colors != 1 && processedImage->colors != 3 && processedImage->colors != 4) ||
+        (processedImage->bits != 8 && processedImage->bits != 16)) {
+        return false;
+    }
+    // clang-format on
+
+    auto format = QImage::Format_Invalid;
+    switch (processedImage->colors) {
+    case 1: // Gray images (tested with image attached on https://bugs.kde.org/show_bug.cgi?id=401371)
+        format = processedImage->bits == 8 ? QImage::Format_Grayscale8 : QImage::Format_Grayscale16;
+        break;
+    case 3: // Images with R G B components
+        format = processedImage->bits == 8 ? QImage::Format_RGB888 : QImage::Format_RGBX64;
+        break;
+    case 4: // Images with R G B components + Alpha (never seen)
+        format = processedImage->bits == 8 ? QImage::Format_RGBA8888 : QImage::Format_RGBA64;
+        break;
+    }
+
+    if (format == QImage::Format_Invalid) {
+        return false;
+    }
+
+    img = imageAlloc(processedImage->width, processedImage->height, format);
+    if (img.isNull()) {
+        return false;
+    }
+
+    auto rawBytesPerLine = qint32(processedImage->width * processedImage->bits * processedImage->colors + 7) / 8;
+    auto lineSize = std::min(qint32(img.bytesPerLine()), rawBytesPerLine);
+    for (int y = 0, h = img.height(); y < h; ++y) {
+        auto scanline = img.scanLine(y);
+        if (format == QImage::Format_RGBX64)
+            rgbToRgbX<quint16>(scanline, processedImage->data + rawBytesPerLine * y, img.bytesPerLine(), rawBytesPerLine);
+        else
+            memcpy(scanline, processedImage->data + rawBytesPerLine * y, lineSize);
+    }
+
+    // *** Set the color space
+    auto &&params = rawProcessor->imgdata.params;
+    if (params.output_color == 0) {
+        auto &&color = rawProcessor->imgdata.color;
+        if (auto profile = reinterpret_cast<char *>(color.profile)) {
+            img.setColorSpace(QColorSpace::fromIccProfile(QByteArray(profile, color.profile_length)));
+        }
+    }
+    if (processedImage->colors >= 3) {
+        if (params.output_color == 1) {
+            img.setColorSpace(QColorSpace(QColorSpace::SRgb));
+        }
+        if (params.output_color == 2) {
+            img.setColorSpace(QColorSpace(QColorSpace::AdobeRgb));
+        }
+        if (params.output_color == 4) {
+            img.setColorSpace(QColorSpace(QColorSpace::ProPhotoRgb));
+        }
+        if (params.output_color == 7) {
+            img.setColorSpace(QColorSpace(QColorSpace::DisplayP3));
+        }
+    }
+
+    // *** Set the metadata
+    auto &&iparams = rawProcessor->imgdata.idata;
+
+    auto xmpPacket = QString();
+    if (auto xmpdata = iparams.xmpdata) {
+        if (auto xmplen = iparams.xmplen)
+            xmpPacket = QString::fromUtf8(xmpdata, xmplen);
+    }
+    // Add info from LibRAW structs (e.g. GPS position, info about lens, info about shot and flash, etc...)
+    img.setText(QStringLiteral("XML:com.adobe.xmp"), updateXmpPacket(xmpPacket, rawProcessor.get()));
+
+    auto model = QString::fromUtf8(iparams.normalized_model);
+    if (!model.isEmpty()) {
+        img.setText(QStringLiteral("Model"), model);
+    }
+    auto manufacturer = QString::fromUtf8(iparams.normalized_make);
+    if (!manufacturer.isEmpty()) {
+        img.setText(QStringLiteral("Manufacturer"), manufacturer);
+    }
+    auto software = QString::fromUtf8(iparams.software);
+    if (!software.isEmpty()) {
+        img.setText(QStringLiteral("Software"), software);
+    }
+
+    auto &&iother = rawProcessor->imgdata.other;
+    auto description = QString::fromUtf8(iother.desc);
+    if (!description.isEmpty()) {
+        img.setText(QStringLiteral("Description"), description);
+    }
+    auto artist = QString::fromUtf8(iother.artist);
+    if (!artist.isEmpty()) {
+        img.setText(QStringLiteral("Author"), artist);
+    }
+
+    return true;
+}
+
+} // Private
+
+RAWHandler::RAWHandler()
+    : m_imageNumber(0)
+    , m_imageCount(0)
+    , m_quality(-1)
+{
+}
+
+bool RAWHandler::canRead() const
+{
+    if (canRead(device())) {
+        setFormat("raw");
+        return true;
+    }
+    return false;
+}
+
+bool RAWHandler::read(QImage *image)
+{
+    auto dev = device();
+
+    // Check image file format.
+    if (dev->atEnd()) {
+        return false;
+    }
+
+    QImage img;
+    if (!LoadRAW(this, img)) {
+        return false;
+    }
+
+    *image = img;
+    return true;
+}
+
+void RAWHandler::setOption(ImageOption option, const QVariant &value)
+{
+    if (option == QImageIOHandler::Quality) {
+        bool ok = false;
+        auto q = value.toInt(&ok);
+        if (ok) {
+            m_quality = q;
+        }
+    }
+}
+
+bool RAWHandler::supportsOption(ImageOption option) const
+{
+#ifndef EXCLUDE_LibRaw_QIODevice
+    if (option == QImageIOHandler::Size) {
+        return true;
+    }
+#endif
+
+    if (option == QImageIOHandler::Quality) {
+        return true;
+    }
+
+    return false;
+}
+
+QVariant RAWHandler::option(ImageOption option) const
+{
+    QVariant v;
+
+#ifndef EXCLUDE_LibRaw_QIODevice
+    if (option == QImageIOHandler::Size) {
+        auto d = device();
+        d->startTransaction();
+        std::unique_ptr<LibRaw> rawProcessor(new LibRaw);
+        LibRaw_QIODevice stream(d);
+#if (LIBRAW_VERSION < LIBRAW_MAKE_VERSION(0, 21, 0))
+        rawProcessor->imgdata.params.shot_select = currentImageNumber();
+#else
+        rawProcessor->imgdata.rawparams.shot_select = currentImageNumber();
+#endif
+        if (rawProcessor->open_datastream(&stream) == LIBRAW_SUCCESS) {
+            if (rawProcessor->unpack() == LIBRAW_SUCCESS) {
+                auto w = libraw_get_iwidth(&rawProcessor->imgdata);
+                auto h = libraw_get_iheight(&rawProcessor->imgdata);
+                // flip & 4: taken from LibRaw code
+                v = (rawProcessor->imgdata.sizes.flip & 4) ? QSize(h, w) : QSize(w, h);
+            }
+        }
+        d->rollbackTransaction();
+    }
+#endif
+
+    if (option == QImageIOHandler::Quality) {
+        v = m_quality;
+    }
+
+    return v;
+}
+
+bool RAWHandler::jumpToNextImage()
+{
+    return jumpToImage(m_imageNumber + 1);
+}
+
+bool RAWHandler::jumpToImage(int imageNumber)
+{
+    if (imageNumber >= imageCount()) {
+        return false;
+    }
+    m_imageNumber = imageNumber;
+    return true;
+}
+
+int RAWHandler::imageCount() const
+{
+    // NOTE: image count is cached for performance reason
+    auto &&count = m_imageCount;
+    if (count > 0) {
+        return count;
+    }
+
+    count = QImageIOHandler::imageCount();
+
+#ifndef EXCLUDE_LibRaw_QIODevice
+    auto d = device();
+    d->startTransaction();
+
+    std::unique_ptr<LibRaw> rawProcessor(new LibRaw);
+    LibRaw_QIODevice stream(d);
+    if (rawProcessor->open_datastream(&stream) == LIBRAW_SUCCESS) {
+        count = rawProcessor->imgdata.rawdata.iparams.raw_count;
+    }
+
+    d->rollbackTransaction();
+#endif
+
+    return count;
+}
+
+int RAWHandler::currentImageNumber() const
+{
+    return m_imageNumber;
+}
+
+bool RAWHandler::canRead(QIODevice *device)
+{
+    if (!device) {
+        qWarning("RAWHandler::canRead() called with no device");
+        return false;
+    }
+    if (device->isSequential()) {
+        return false;
+    }
+
+    device->startTransaction();
+
+    std::unique_ptr<LibRaw> rawProcessor(new LibRaw);
+
+#ifndef EXCLUDE_LibRaw_QIODevice
+    LibRaw_QIODevice stream(device);
+    auto ok = rawProcessor->open_datastream(&stream) == LIBRAW_SUCCESS;
+#else
+    auto ba = device->readAll();
+    auto ok = rawProcessor->open_buffer(ba.data(), ba.size()) == LIBRAW_SUCCESS;
+#endif
+
+    device->rollbackTransaction();
+    return ok;
+}
+
+QImageIOPlugin::Capabilities RAWPlugin::capabilities(QIODevice *device, const QByteArray &format) const
+{
+    if (supported_formats.contains(QByteArray(format).toLower())) {
+        return Capabilities(CanRead);
+    }
+    if (!format.isEmpty()) {
+        return {};
+    }
+    if (!device->isOpen()) {
+        return {};
+    }
+
+    Capabilities cap;
+    if (device->isReadable() && RAWHandler::canRead(device)) {
+        cap |= CanRead;
+    }
+    return cap;
+}
+
+QImageIOHandler *RAWPlugin::create(QIODevice *device, const QByteArray &format) const
+{
+    QImageIOHandler *handler = new RAWHandler;
+    handler->setDevice(device);
+    handler->setFormat(format);
+    return handler;
+}

src/imageformats/raw.desktop

@@ -0,0 +1,7 @@
+[Desktop Entry]
+Type=Service
+X-KDE-ServiceTypes=QImageIOPlugins
+X-KDE-ImageFormat=3fr,arw,arq,bay,bmq,crw,cr2,cr3,cap,cine,cs1,dcs,dc2,dcr,dng,drf,dxo,eip,erf,fff,hdr,iiq,k25,kdc,kc2,mdc,mef,mfw,mos,mrw,nef,nrw,obm,orf,ori,pef,ptx,pxn,qtk,r3d,raf,raw,rdc,rwl,rw2,rwz,sr2,srf,srw,sti,x3f
+X-KDE-MimeType=image/x-hasselblad-3fr,image/x-sony-arw,image/x-arq,image/x-bay,image/x-bmq,image/x-canon-crw,image/x-canon-cr2,image/x-canon-cr3,image/x-cap,image/x-cine,image/x-cs1,image/x-kodak-dcs,image/x-dc2,image/x-kodak-dcr,image/x-adobe-dng,image/x-drf,image/x-dxo,image/x-epson-eip,image/x-epson-erf,image/x-fff,image/x-hdr,image/x-iiq,image/x-kodak-k25,image/x-kodak-kdc,image/x-kodak-kc2,image/x-minolta-mdc,image/x-mamiya-mef,image/x-mfw,image/x-aptus-mos,image/x-minolta-mrw,image/x-nikon-nef,image/x-nikon-nrw,image/x-obm,image/x-olympus-orf,image/x-ori,image/x-pentax-pef,image/x-ptx,image/x-pxn,image/x-qtk,image/x-r3d,image/x-fuji-raf,image/x-raw,image/x-rdc,image/x-rwl,image/x-panasonic-rw2,image/x-rwz,image/x-sony-sr2,image/x-sony-srf,image/x-samsung-srw,image/x-sti,image/x-sigma-x3f
+X-KDE-Read=true
+X-KDE-Write=false

src/imageformats/raw.json

@@ -0,0 +1,40 @@
+{
+    "Keys": [
+        "3fr",
+        "arw", "arq",
+        "bay", "bmq",
+        "crw", "cr2", "cr3", "cap", "cine", "cs1",
+        "dcs", "dc2", "dcr", "dng", "drf", "dxo",
+        "eip", "erf",
+        "fff",
+        "iiq",
+        "k25", "kdc", "kc2",
+        "mdc", "mef", "mfw", "mos", "mrw",
+        "nef", "nrw",
+        "obm", "orf", "ori",
+        "pef", "ptx", "pxn",
+        "qtk",
+        "r3d", "raf", "raw", "rdc", "rwl", "rw2", "rwz",
+        "sr2", "srf", "srw", "sti",
+        "x3f"
+    ],
+    "MimeTypes": [
+        "image/x-hasselblad-3fr",
+        "image/x-sony-arw", "image/x-arq",
+        "image/x-bay", "image/x-bmq",
+        "image/x-canon-crw", "image/x-canon-cr2", "image/x-canon-cr3", "image/x-cap", "image/x-cine", "image/x-cs1",
+        "image/x-kodak-dcs", "image/x-dc2", "image/x-kodak-dcr", "image/x-adobe-dng", "image/x-drf", "image/x-dxo",
+        "image/x-epson-eip", "image/x-epson-erf",
+        "image/x-fff",
+        "image/x-iiq",
+        "image/x-kodak-k25", "image/x-kodak-kdc", "image/x-kodak-kc2",
+        "image/x-minolta-mdc", "image/x-mamiya-mef", "image/x-mfw", "image/x-aptus-mos", "image/x-minolta-mrw",
+        "image/x-nikon-nef", "image/x-nikon-nrw",
+        "image/x-obm", "image/x-olympus-orf", "image/x-ori",
+        "image/x-pentax-pef", "image/x-ptx", "image/x-pxn",
+        "image/x-qtk",
+        "image/x-r3d", "image/x-fuji-raf", "image/x-raw", "image/x-rdc", "image/x-rwl", "image/x-panasonic-rw2", "image/x-rwz",
+        "image/x-sony-sr2", "image/x-sony-srf", "image/x-samsung-srw", "image/x-sti",
+        "image/x-sigma-x3f"
+    ]
+}

src/imageformats/raw_p.h

@@ -0,0 +1,93 @@
+/*
+    This file is part of the KDE project
+
+    SPDX-FileCopyrightText: 2022 Mirco Miranda <mircomir@outlook.com>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
+
+#ifndef KIMG_RAW_P_H
+#define KIMG_RAW_P_H
+
+#include <QImageIOPlugin>
+
+class RAWHandler : public QImageIOHandler
+{
+public:
+    RAWHandler();
+
+    bool canRead() const override;
+    bool read(QImage *image) override;
+
+    void setOption(ImageOption option, const QVariant &value) override;
+    bool supportsOption(QImageIOHandler::ImageOption option) const override;
+    QVariant option(QImageIOHandler::ImageOption option) const override;
+
+    bool jumpToNextImage() override;
+    bool jumpToImage(int imageNumber) override;
+    int imageCount() const override;
+    int currentImageNumber() const override;
+
+    static bool canRead(QIODevice *device);
+
+private:
+    qint32 m_imageNumber;
+
+    mutable qint32 m_imageCount;
+
+    /**
+     * @brief m_quality
+     * Change the quality of the conversion. If -1, default quality is used.
+     * @note Verify that the quality change support has been compiled with supportsOption()
+     *
+     *   3                   2                 1           0
+     * 1 0 9 8 7 6 5 4 3 2 1 0 9 87 6 5 4 3 2 1098 7654 3210
+     * _ _ _ _ _ _ _ _ _ _ _ S F NN E H B A W CCCC IIII PPPP
+     *
+     * Where:
+     *
+     * _: reserved
+     * P: preset values: *** if set, other flags are ignored! ***
+     * -  0: Use other flags (no preset)
+     * -  1: I =  0, C = 1, B = 0, W = 1, A = 1, H = 1 (Linear, sRGB, 8-bits, Camera White, Auto White, Half-size)
+     * -  2: I =  0, C = 1, B = 0, W = 1, A = 1, H = 0 (Linear, sRGB, 8-bits, Camera White, Auto White)
+     * -  3: I =  3, C = 1, B = 0, W = 1, A = 1, H = 0 (AHD, sRGB, 8-bits, Camera White, Auto White)
+     * -  4: I =  3, C = 1, B = 1, W = 1, A = 1, H = 0 (AHD, sRGB, 16-bits, Camera White, Auto White)
+     * -  5: I =  3, C = 2, B = 1, W = 1, A = 1, H = 0 (AHD, Adobe, 16-bits, Camera White, Auto White)
+     * -  6: I =  3, C = 4, B = 1, W = 1, A = 1, H = 0 (AHD, ProPhoto, 16-bits, Camera White, Auto White)
+     * -  7: I = 11, C = 1, B = 0, W = 1, A = 1, H = 0 (DHT, sRGB, 8-bits, Camera White, Auto White)
+     * -  8: I = 11, C = 1, B = 1, W = 1, A = 1, H = 0 (DHT, sRGB, 16-bits, Camera White, Auto White)
+     * -  9: I = 11, C = 2, B = 1, W = 1, A = 1, H = 0 (DHT, Adobe, 16-bits, Camera White, Auto White)
+     * - 10: I = 11, C = 4, B = 1, W = 1, A = 1, H = 0 (DHT, ProPhoto, 16-bits, Camera White, Auto White)
+     * - 11: reserved
+     * - 12: reserved
+     * - 13: reserved
+     * - 14: reserved
+     * - 15: reserved
+     * I: interpolation quality (0 - linear, 1 - VNG, 2 - PPG, 3 - AHD, 4 - DCB, 11 - DHT, 12 - AAHD)
+     * C: output colorspace (0 - raw, 1 - sRGB, 2 - Adobe, 3 - Wide, 4 - ProPhoto, 5 - XYZ, 6 - ACES, 7 - DCI-P3, 8 - Rec2020)
+     * W: use camera white balace (0 - off, 1 - on)
+     * A: use auto white balance (0 - off, 1 - on)
+     * B: output bit per sample (0 - 8-bits, 1 - 16-bits)
+     * H: half size image (0 - off, 1 - on)
+     * E: DCB color enhance (0 - off, 1 - on)
+     * N: FBDD noise reduction (0 - off, 1 - light, 2 - full)
+     * F: Interpolate RGGB as four colors (0 - off, 1 - on)
+     * S: Don't stretch or rotate raw pixels (0 - rotate and stretch, 1 - don't rotate and stretch)
+     *
+     * @note It is safe to set both W and A: W is used if camera white balance is found, otherwise A is used.
+     */
+    qint32 m_quality;
+};
+
+class RAWPlugin : public QImageIOPlugin
+{
+    Q_OBJECT
+    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QImageIOHandlerFactoryInterface" FILE "raw.json")
+
+public:
+    Capabilities capabilities(QIODevice *device, const QByteArray &format) const override;
+    QImageIOHandler *create(QIODevice *device, const QByteArray &format = QByteArray()) const override;
+};
+
+#endif // KIMG_RAW_P_H

src/imageformats/rgb.cpp

@@ -20,6 +20,7 @@
  */
 
 #include "rgb_p.h"
+#include "util_p.h"
 
 #include <QMap>
 #include <QVector>
@@ -324,7 +325,7 @@ bool SGIImage::readImage(QImage &img)
         return false;
     }
 
-    img = QImage(_xsize, _ysize, QImage::Format_RGB32);
+    img = imageAlloc(_xsize, _ysize, QImage::Format_RGB32);
     if (img.isNull()) {
         qWarning() << "Failed to allocate image, invalid dimensions?" << QSize(_xsize, _ysize);
         return false;
@@ -671,11 +672,16 @@ bool SGIImage::writeImage(const QImage &image)
         _dim = 3, _zsize = 3;
     }
 
-    if (img.format() == QImage::Format_ARGB32) {
+    auto hasAlpha = img.hasAlphaChannel();
+    if (hasAlpha) {
         _dim = 3, _zsize++;
     }
 
-    img = img.convertToFormat(QImage::Format_RGB32);
+    if (hasAlpha && img.format() != QImage::Format_ARGB32) {
+        img = img.convertToFormat(QImage::Format_ARGB32);
+    } else if (!hasAlpha && img.format() != QImage::Format_RGB32) {
+        img = img.convertToFormat(QImage::Format_RGB32);
+    }
     if (img.isNull()) {
         //         qDebug() << "can't convert image to depth 32";
         return false;
@@ -684,7 +690,7 @@ bool SGIImage::writeImage(const QImage &image)
     const int w = img.width();
     const int h = img.height();
 
-    if (w > 65536 || h > 65536) {
+    if (w > 65535 || h > 65535) {
         return false;
     }
 
@@ -711,12 +717,6 @@ bool SGIImage::writeImage(const QImage &image)
         rle_size += _rlevector[i]->size();
     }
 
-    //     qDebug() << "minimum intensity: " << _pixmin;
-    //     qDebug() << "maximum intensity: " << _pixmax;
-    //     qDebug() << "saved scanlines: " << _numrows - _rlemap.size();
-    //     qDebug() << "total savings: " << (verbatim_size - rle_size) << " bytes";
-    //     qDebug() << "compression: " << (rle_size * 100.0 / verbatim_size) << '%';
-
     if (verbatim_size <= rle_size) {
         writeVerbatim(img);
     } else {

src/imageformats/tga.cpp

@@ -17,6 +17,7 @@
  */
 
 #include "tga_p.h"
+#include "util_p.h"
 
 #include <assert.h>
 
@@ -172,7 +173,7 @@ struct TgaHeaderInfo {
 static bool LoadTGA(QDataStream &s, const TgaHeader &tga, QImage &img)
 {
     // Create image.
-    img = QImage(tga.width, tga.height, QImage::Format_RGB32);
+    img = imageAlloc(tga.width, tga.height, QImage::Format_RGB32);
     if (img.isNull()) {
         qWarning() << "Failed to allocate image, invalid dimensions?" << QSize(tga.width, tga.height);
         return false;
@@ -184,7 +185,7 @@ static bool LoadTGA(QDataStream &s, const TgaHeader &tga, QImage &img)
     const int numAlphaBits = tga.flags & 0xf;
     // However alpha exists only in the 32 bit format.
     if ((tga.pixel_size == 32) && (tga.flags & 0xf)) {
-        img = QImage(tga.width, tga.height, QImage::Format_ARGB32);
+        img = imageAlloc(tga.width, tga.height, QImage::Format_ARGB32);
         if (img.isNull()) {
             qWarning() << "Failed to allocate image, invalid dimensions?" << QSize(tga.width, tga.height);
             return false;
@@ -427,8 +428,20 @@ bool TGAHandler::write(const QImage &image)
     QDataStream s(device());
     s.setByteOrder(QDataStream::LittleEndian);
 
-    const QImage &img = image;
-    const bool hasAlpha = (img.format() == QImage::Format_ARGB32);
+    QImage img(image);
+    const bool hasAlpha = img.hasAlphaChannel();
+    if (hasAlpha && img.format() != QImage::Format_ARGB32) {
+        img = img.convertToFormat(QImage::Format_ARGB32);
+    } else if (!hasAlpha && img.format() != QImage::Format_RGB32) {
+        img = img.convertToFormat(QImage::Format_RGB32);
+    }
+    if (img.isNull()) {
+        qDebug() << "TGAHandler::write: image conversion to 32 bits failed!";
+        return false;
+    }
+    static constexpr quint8 originTopLeft = TGA_ORIGIN_UPPER + TGA_ORIGIN_LEFT; // 0x20
+    static constexpr quint8 alphaChannel8Bits = 0x08;
+
     for (int i = 0; i < 12; i++) {
         s << targaMagic[i];
     }
@@ -437,11 +450,12 @@ bool TGAHandler::write(const QImage &image)
     s << quint16(img.width()); // width
     s << quint16(img.height()); // height
     s << quint8(hasAlpha ? 32 : 24); // depth (24 bit RGB + 8 bit alpha)
-    s << quint8(hasAlpha ? 0x24 : 0x20); // top left image (0x20) + 8 bit alpha (0x4)
+    s << quint8(hasAlpha ? originTopLeft + alphaChannel8Bits : originTopLeft);   // top left image (0x20) + 8 bit alpha (0x8)
 
     for (int y = 0; y < img.height(); y++) {
+        auto ptr = reinterpret_cast<QRgb *>(img.scanLine(y));
         for (int x = 0; x < img.width(); x++) {
-            const QRgb color = img.pixel(x, y);
+            auto color = *(ptr + x);
             s << quint8(qBlue(color));
             s << quint8(qGreen(color));
             s << quint8(qRed(color));

src/imageformats/util_p.h

@@ -1,10 +1,42 @@
 /*
     SPDX-FileCopyrightText: 2022 Albert Astals Cid <aacid@kde.org>
+    SPDX-FileCopyrightText: 2022 Mirco Miranda <mircomir@outlook.com>
 
     SPDX-License-Identifier: LGPL-2.0-or-later
 */
 
+#ifndef UTIL_P_H
+#define UTIL_P_H
+
 #include <limits>
 
+#include <QImage>
+
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+#include <QImageIOHandler>
+#endif
+
 // QVector uses some extra space for stuff, hence the 32 here suggested by Thiago Macieira
 static constexpr int kMaxQVectorSize = std::numeric_limits<int>::max() - 32;
+
+// On Qt 6 to make the plugins fail to allocate if the image size is greater than QImageReader::allocationLimit()
+// it is necessary to allocate the image with QImageIOHandler::allocateImage().
+inline QImage imageAlloc(const QSize &size, const QImage::Format &format)
+{
+    QImage img;
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
+    img = QImage(size, format);
+#else
+    if (!QImageIOHandler::allocateImage(size, format, &img)) {
+        img = QImage(); // paranoia
+    }
+#endif
+    return img;
+}
+
+inline QImage imageAlloc(qint32 width, qint32 height, const QImage::Format &format)
+{
+    return imageAlloc(QSize(width, height), format);
+}
+
+#endif // UTIL_P_H

src/imageformats/xcf.cpp

@@ -6,6 +6,7 @@
     SPDX-License-Identifier: LGPL-2.1-or-later
 */
 
+#include "util_p.h"
 #include "xcf_p.h"
 
 #include <QDebug>
@@ -17,6 +18,9 @@
 #include <QVector>
 #include <QtEndian>
 #include <QColorSpace>
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+#include <QImageReader>
+#endif
 
 #include <stdlib.h>
 #include <string.h>
@@ -1093,12 +1097,27 @@ bool XCFImageFormat::composeTiles(XCFImage &xcf_image)
     qCDebug(XCFPLUGIN) << "LAYER: height=" << layer.height << ", width=" << layer.width;
     qCDebug(XCFPLUGIN) << "LAYER: rows=" << layer.nrows << ", columns=" << layer.ncols;
 
+    // NOTE: starting from GIMP 2.10, images can be very large. The 32K limit for width and height is obsolete
+    //       and it was changed to 300000 (the same as Photoshop Big image). This plugin was able to open an RGB
+    //       image of 108000x40000 pixels saved with GIMP 2.10
     // SANITY CHECK: Catch corrupted XCF image file where the width or height
     // of a tile is reported are bogus. See Bug# 234030.
-    if (layer.width > 32767 || layer.height > 32767 || (sizeof(void *) == 4 && layer.width * layer.height > 16384 * 16384)) {
+    if (layer.width > 300000 || layer.height > 300000 || (sizeof(void *) == 4 && layer.width * layer.height > 16384 * 16384)) {
         return false;
     }
 
+    // Qt 6 image allocation limit calculation: we have to check the limit here because the image is splitted in
+    // tiles of 64x64 pixels. The required memory to build the image is at least doubled because tiles are loaded
+    // and then the final image is created by copying the tiles inside it.
+    // NOTE: on Windows to open a 10GiB image the plugin uses 28GiB of RAM
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+    qint64 channels = 1 + (layer.type == RGB_GIMAGE ? 2 : 0) + (layer.type == RGBA_GIMAGE ? 3 : 0);
+    if (qint64(layer.width) * qint64(layer.height) * channels * 2ll / 1024ll / 1024ll > QImageReader::allocationLimit()) {
+        qCDebug(XCFPLUGIN) << "Rejecting image as it exceeds the current allocation limit of" << QImageReader::allocationLimit() << "megabytes";
+        return false;
+    }
+#endif
+
     layer.image_tiles.resize(layer.nrows);
 
     if (layer.type == GRAYA_GIMAGE || layer.type == INDEXEDA_GIMAGE) {
@@ -1251,7 +1270,7 @@ void XCFImageFormat::setImageParasites(const XCFImage &xcf_image, QImage &image)
 {
     auto&& p = xcf_image.parasites;
     auto keys = p.keys();
-    for (auto&& key : qAsConst(keys)) {
+    for (auto &&key : std::as_const(keys)) {
         auto value = p.value(key);
         if(value.isEmpty())
             continue;
@@ -1917,7 +1936,7 @@ bool XCFImageFormat::initializeImage(XCFImage &xcf_image)
     switch (layer.type) {
     case RGB_GIMAGE:
         if (layer.opacity == OPAQUE_OPACITY) {
-            image = QImage(xcf_image.width, xcf_image.height, QImage::Format_RGB32);
+            image = imageAlloc(xcf_image.width, xcf_image.height, QImage::Format_RGB32);
             if (image.isNull()) {
                 return false;
             }
@@ -1926,7 +1945,7 @@ bool XCFImageFormat::initializeImage(XCFImage &xcf_image)
         } // else, fall through to 32-bit representation
         Q_FALLTHROUGH();
     case RGBA_GIMAGE:
-        image = QImage(xcf_image.width, xcf_image.height, QImage::Format_ARGB32);
+        image = imageAlloc(xcf_image.width, xcf_image.height, QImage::Format_ARGB32);
         if (image.isNull()) {
             return false;
         }
@@ -1935,7 +1954,7 @@ bool XCFImageFormat::initializeImage(XCFImage &xcf_image)
 
     case GRAY_GIMAGE:
         if (layer.opacity == OPAQUE_OPACITY) {
-            image = QImage(xcf_image.width, xcf_image.height, QImage::Format_Indexed8);
+            image = imageAlloc(xcf_image.width, xcf_image.height, QImage::Format_Indexed8);
             image.setColorCount(256);
             if (image.isNull()) {
                 return false;
@@ -1946,7 +1965,7 @@ bool XCFImageFormat::initializeImage(XCFImage &xcf_image)
         } // else, fall through to 32-bit representation
         Q_FALLTHROUGH();
     case GRAYA_GIMAGE:
-        image = QImage(xcf_image.width, xcf_image.height, QImage::Format_ARGB32);
+        image = imageAlloc(xcf_image.width, xcf_image.height, QImage::Format_ARGB32);
         if (image.isNull()) {
             return false;
         }
@@ -1967,7 +1986,7 @@ bool XCFImageFormat::initializeImage(XCFImage &xcf_image)
         // or two-color palette. Have to ask about this...
 
         if (xcf_image.num_colors <= 2) {
-            image = QImage(xcf_image.width, xcf_image.height, QImage::Format_MonoLSB);
+            image = imageAlloc(xcf_image.width, xcf_image.height, QImage::Format_MonoLSB);
             image.setColorCount(xcf_image.num_colors);
             if (image.isNull()) {
                 return false;
@@ -1975,7 +1994,7 @@ bool XCFImageFormat::initializeImage(XCFImage &xcf_image)
             image.fill(0);
             setPalette(xcf_image, image);
         } else if (xcf_image.num_colors <= 256) {
-            image = QImage(xcf_image.width, xcf_image.height, QImage::Format_Indexed8);
+            image = imageAlloc(xcf_image.width, xcf_image.height, QImage::Format_Indexed8);
             image.setColorCount(xcf_image.num_colors);
             if (image.isNull()) {
                 return false;
@@ -1993,7 +2012,7 @@ bool XCFImageFormat::initializeImage(XCFImage &xcf_image)
             xcf_image.palette[1] = xcf_image.palette[0];
             xcf_image.palette[0] = qRgba(255, 255, 255, 0);
 
-            image = QImage(xcf_image.width, xcf_image.height, QImage::Format_MonoLSB);
+            image = imageAlloc(xcf_image.width, xcf_image.height, QImage::Format_MonoLSB);
             image.setColorCount(xcf_image.num_colors);
             if (image.isNull()) {
                 return false;
@@ -2009,7 +2028,7 @@ bool XCFImageFormat::initializeImage(XCFImage &xcf_image)
             }
 
             xcf_image.palette[0] = qRgba(255, 255, 255, 0);
-            image = QImage(xcf_image.width, xcf_image.height, QImage::Format_Indexed8);
+            image = imageAlloc(xcf_image.width, xcf_image.height, QImage::Format_Indexed8);
             image.setColorCount(xcf_image.num_colors);
             if (image.isNull()) {
                 return false;
@@ -2020,7 +2039,7 @@ bool XCFImageFormat::initializeImage(XCFImage &xcf_image)
             // No room for a transparent color, so this has to be promoted to
             // true color. (There is no equivalent PNG representation output
             // from The GIMP as of v1.2.)
-            image = QImage(xcf_image.width, xcf_image.height, QImage::Format_ARGB32);
+            image = imageAlloc(xcf_image.width, xcf_image.height, QImage::Format_ARGB32);
             if (image.isNull()) {
                 return false;
             }
@@ -2031,11 +2050,11 @@ bool XCFImageFormat::initializeImage(XCFImage &xcf_image)
 
     if (xcf_image.x_resolution > 0 && xcf_image.y_resolution > 0) {
         const float dpmx = xcf_image.x_resolution * INCHESPERMETER;
-        if (dpmx > std::numeric_limits<int>::max()) {
+        if (dpmx > float(std::numeric_limits<int>::max())) {
             return false;
         }
         const float dpmy = xcf_image.y_resolution * INCHESPERMETER;
-        if (dpmy > std::numeric_limits<int>::max()) {
+        if (dpmy > float(std::numeric_limits<int>::max())) {
             return false;
         }
         image.setDotsPerMeterX((int)dpmx);
@@ -3322,6 +3341,9 @@ bool XCFHandler::canRead(QIODevice *device)
         qCDebug(XCFPLUGIN) << "XCFHandler::canRead() called with no device";
         return false;
     }
+    if (device->isSequential()) {
+        return false;
+    }
 
     qint64 oldPos = device->pos();