update version for new release

All frameworks are maintained by the KDE community

.gitlab-ci.yml

@@ -2,7 +2,9 @@
 # SPDX-License-Identifier: CC0-1.0
 
 include:
-  - 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/freebsd-qt6.yml
-  - https://invent.kde.org/sysadmin/ci-utilities/raw/master/gitlab-templates/windows-qt6.yml
+  - project: sysadmin/ci-utilities
+    file:
+      - /gitlab-templates/linux-qt6.yml
+      - /gitlab-templates/android-qt6.yml
+      - /gitlab-templates/freebsd-qt6.yml
+      - /gitlab-templates/windows-qt6.yml

.kde-ci.yml

@@ -1,5 +1,5 @@
 Dependencies:
-- 'on': ['Linux', 'FreeBSD', 'macOS', 'Windows']
+- 'on': ['Linux', 'FreeBSD', 'macOS', 'Windows', 'Android']
   'require':
     'frameworks/extra-cmake-modules': '@same'
     'frameworks/karchive' : '@same'

CMakeLists.txt

@@ -1,9 +1,11 @@
 cmake_minimum_required(VERSION 3.16)
 
-project(KImageFormats)
+set(KF_VERSION "6.3.0") # handled by release scripts
+set(KF_DEP_VERSION "6.3.0") # handled by release scripts
+project(KImageFormats VERSION ${KF_VERSION})
 
 include(FeatureSummary)
-find_package(ECM 5.240.0  NO_MODULE)
+find_package(ECM 6.3.0  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)
 
@@ -22,7 +24,7 @@ include(FindPkgConfig)
 set(REQUIRED_QT_VERSION 6.5.0)
 find_package(Qt6Gui ${REQUIRED_QT_VERSION} REQUIRED NO_MODULE)
 
-find_package(KF6Archive)
+find_package(KF6Archive ${KF_DEP_VERSION})
 set_package_properties(KF6Archive PROPERTIES
     TYPE OPTIONAL
     PURPOSE "Required for the QImage plugin for Krita and OpenRaster images"
@@ -81,7 +83,7 @@ set_package_properties(LibRaw PROPERTIES
 )
 
 ecm_set_disabled_deprecation_versions(
-    QT 6.4
+    QT 6.5
     KF 5.102
 )
 
@@ -91,6 +93,7 @@ if (BUILD_TESTING)
     add_subdirectory(tests)
 endif()
 
-feature_summary(WHAT ALL FATAL_ON_MISSING_REQUIRED_PACKAGES)
+include(ECMFeatureSummary)
+ecm_feature_summary(WHAT ALL FATAL_ON_MISSING_REQUIRED_PACKAGES)
 
 kde_configure_git_pre_commit_hook(CHECKS CLANG_FORMAT)

LICENSES/BSD-2-Clause.txt

@@ -0,0 +1,9 @@
+Copyright (c) <year> <owner> 
+
+Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

LICENSES/BSD-3-Clause.txt

@@ -0,0 +1,11 @@
+Copyright (c) <year> <owner>. 
+
+Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

README.md

@@ -17,7 +17,6 @@ The following image formats have read-only support:
 - Camera RAW images (arw, cr2, cr3, dcs, dng, ...)
 - Gimp (xcf)
 - Krita (kra)
-- OpenEXR (exr)
 - OpenRaster (ora)
 - Photoshop documents (psd, psb, pdd, psdt)
 - Radiance HDR (hdr)
@@ -29,6 +28,7 @@ The following image formats have read and write support:
 - Encapsulated PostScript (eps)
 - High Efficiency Image File Format (heif). Can be enabled with the KIMAGEFORMATS_HEIF build option.
 - JPEG XL (jxl)
+- OpenEXR (exr)
 - Personal Computer Exchange (pcx)
 - Quite OK Image format (qoi)
 - SGI images (rgb, rgba, sgi, bw)
@@ -45,10 +45,6 @@ of Qt is the license.  As such, if you write an imageformat plugin and
 you are willing to sign the Qt Project contributor agreement, it may be
 better to submit the plugin directly to the Qt Project.
 
-Note that the imageformat plugins provided by this module also provide a
-desktop file.  This is for the benefit of KImageIO in the KDE4 Support
-framework.
-
 ## Duplicated Plugins
 
 The TGA plugin supports more formats than Qt's own TGA plugin;

autotests/CMakeLists.txt

@@ -97,6 +97,12 @@ if (LibHeif_FOUND)
     kimageformats_write_tests(FUZZ 1
         heif-nodatacheck-lossless
     )
+
+    if (LibHeif_VERSION VERSION_GREATER_EQUAL "1.17.0")
+        kimageformats_read_tests(FUZZ 1
+            hej2
+        )
+    endif()
 endif()
 
 if (LibJXL_FOUND AND LibJXLThreads_FOUND)
@@ -138,6 +144,11 @@ if (OpenEXR_FOUND)
     kimageformats_read_tests(
         exr
     )
+    # Color space conversions from sRGB to linear on saving and
+    # from linear to sRGB on loading result in some rounding errors.
+    kimageformats_write_tests(FUZZ 5
+        exr-nodatacheck-lossless
+    )
 endif()
 
 if (LibRaw_FOUND)

autotests/writetest.cpp

@@ -7,6 +7,7 @@
 #include <stdio.h>
 
 #include <QBuffer>
+#include <QColorSpace>
 #include <QCommandLineParser>
 #include <QCoreApplication>
 #include <QDir>
@@ -23,8 +24,8 @@ int main(int argc, char **argv)
     QCoreApplication app(argc, argv);
     QCoreApplication::removeLibraryPath(QStringLiteral(PLUGIN_DIR));
     QCoreApplication::addLibraryPath(QStringLiteral(PLUGIN_DIR));
-    QCoreApplication::setApplicationName(QStringLiteral("readtest"));
-    QCoreApplication::setApplicationVersion(QStringLiteral("1.0.0"));
+    QCoreApplication::setApplicationName(QStringLiteral("writetest"));
+    QCoreApplication::setApplicationVersion(QStringLiteral("1.1.0"));
 
     QCommandLineParser parser;
     parser.setApplicationDescription(QStringLiteral("Performs basic image conversion checking."));
@@ -148,6 +149,14 @@ int main(int argc, char **argv)
                 ++failed;
                 continue;
             }
+            if (reReadImage.colorSpace().isValid()) {
+                QColorSpace toColorSpace;
+                if (pngImage.colorSpace().isValid()) {
+                    reReadImage.convertToColorSpace(pngImage.colorSpace());
+                } else {
+                    reReadImage.convertToColorSpace(QColorSpace(QColorSpace::SRgb));
+                }
+            }
             reReadImage = reReadImage.convertToFormat(pngImage.format());
         }
 

metainfo.yaml

@@ -1,4 +1,3 @@
-maintainer: alexmerry
 description: Image format plugins for Qt
 tier: 2
 type: functional

src/imageformats/CMakeLists.txt

@@ -41,7 +41,7 @@ endif()
 ##################################
 
 if(OpenEXR_FOUND)
-    kimageformats_add_plugin(kimg_exr SOURCES exr.cpp)
+    kimageformats_add_plugin(kimg_exr SOURCES exr.cpp scanlineconverter.cpp)
     if(TARGET OpenEXR::OpenEXR)
         target_link_libraries(kimg_exr PRIVATE OpenEXR::OpenEXR)
     else()

src/imageformats/ani.cpp

@@ -383,7 +383,7 @@ bool ANIHandler::ensureScanned() const
 
             // TODO should we check that the number of rate entries matches nSteps?
             auto *dataPtr = data.data();
-            QVector<int> list;
+            QList<int> list;
             for (int i = 0; i < data.size(); i += sizeof(quint32_le)) {
                 const auto entry = *(reinterpret_cast<const quint32_le *>(dataPtr + i));
                 list.append(entry);

src/imageformats/ani_p.h

@@ -41,14 +41,14 @@ private:
     int m_frameCount = 0; // "physical" frames
     int m_imageCount = 0; // logical images
     // Stores a custom sequence of images
-    QVector<int> m_imageSequence;
+    QList<int> m_imageSequence;
     // and the corresponding offsets where they are
     // since we can't read the image data sequentally in this case then
-    QVector<qint64> m_frameOffsets;
+    QList<qint64> m_frameOffsets;
     qint64 m_firstFrameOffset = 0;
 
     int m_displayRate = 0;
-    QVector<int> m_displayRates;
+    QList<int> m_displayRates;
 
     QString m_name;
     QString m_artist;

src/imageformats/avif.cpp

@@ -16,9 +16,34 @@
 
 #include <cfloat>
 
+/*
+Quality range - compression/subsampling
+100 - lossless RGB compression
+< KIMG_AVIF_QUALITY_BEST, 100 ) - YUV444 color subsampling
+< KIMG_AVIF_QUALITY_HIGH, KIMG_AVIF_QUALITY_BEST ) - YUV422 color subsampling
+< 0, KIMG_AVIF_QUALITY_HIGH ) - YUV420 color subsampling
+< 0, KIMG_AVIF_QUALITY_LOW ) - lossy compression of alpha channel
+*/
+
+#ifndef KIMG_AVIF_DEFAULT_QUALITY
+#define KIMG_AVIF_DEFAULT_QUALITY 68
+#endif
+
+#ifndef KIMG_AVIF_QUALITY_BEST
+#define KIMG_AVIF_QUALITY_BEST 90
+#endif
+
+#ifndef KIMG_AVIF_QUALITY_HIGH
+#define KIMG_AVIF_QUALITY_HIGH 80
+#endif
+
+#ifndef KIMG_AVIF_QUALITY_LOW
+#define KIMG_AVIF_QUALITY_LOW 51
+#endif
+
 QAVIFHandler::QAVIFHandler()
     : m_parseState(ParseAvifNotParsed)
-    , m_quality(52)
+    , m_quality(KIMG_AVIF_DEFAULT_QUALITY)
     , m_container_width(0)
     , m_container_height(0)
     , m_rawAvifData(AVIF_DATA_EMPTY)
@@ -330,6 +355,10 @@ bool QAVIFHandler::decode_one_frame()
     avifRGBImage rgb;
     avifRGBImageSetDefaults(&rgb, m_decoder->image);
 
+#if AVIF_VERSION >= 1000000
+    rgb.maxThreads = m_decoder->maxThreads;
+#endif
+
     if (m_decoder->image->depth > 8) {
         rgb.depth = 16;
         rgb.format = AVIF_RGB_FORMAT_RGBA;
@@ -515,9 +544,17 @@ bool QAVIFHandler::write(const QImage &image)
         }
     }
 
+    if (m_quality > 100) {
+        m_quality = 100;
+    } else if (m_quality < 0) {
+        m_quality = KIMG_AVIF_DEFAULT_QUALITY;
+    }
+
+#if AVIF_VERSION < 1000000
     int maxQuantizer = AVIF_QUANTIZER_WORST_QUALITY * (100 - qBound(0, m_quality, 100)) / 100;
     int minQuantizer = 0;
     int maxQuantizerAlpha = 0;
+#endif
     avifResult res;
 
     bool save_grayscale; // true - monochrome, false - colors
@@ -563,13 +600,15 @@ bool QAVIFHandler::write(const QImage &image)
         break;
     }
 
-    // quality settings
+#if AVIF_VERSION < 1000000
+    // deprecated quality settings
     if (maxQuantizer > 20) {
         minQuantizer = maxQuantizer - 20;
         if (maxQuantizer > 40) { // we decrease quality of alpha channel here
             maxQuantizerAlpha = maxQuantizer - 40;
         }
     }
+#endif
 
     if (save_grayscale && !image.hasAlphaChannel()) { // we are going to save grayscale image without alpha channel
         if (save_depth > 8) {
@@ -642,8 +681,8 @@ bool QAVIFHandler::write(const QImage &image)
         QImage tmpcolorimage = image.convertToFormat(tmpformat);
 
         avifPixelFormat pixel_format = AVIF_PIXEL_FORMAT_YUV420;
-        if (maxQuantizer < 20) {
-            if (maxQuantizer < 10) {
+        if (m_quality >= KIMG_AVIF_QUALITY_HIGH) {
+            if (m_quality >= KIMG_AVIF_QUALITY_BEST) {
                 pixel_format = AVIF_PIXEL_FORMAT_YUV444; // best quality
             } else {
                 pixel_format = AVIF_PIXEL_FORMAT_YUV422; // high quality
@@ -714,9 +753,9 @@ bool QAVIFHandler::write(const QImage &image)
                     if (save_depth == 8) {
                         save_depth = 10;
                         if (tmpcolorimage.hasAlphaChannel()) {
-                            tmpcolorimage = tmpcolorimage.convertToFormat(QImage::Format_RGBA64);
+                            tmpcolorimage.convertTo(QImage::Format_RGBA64);
                         } else {
-                            tmpcolorimage = tmpcolorimage.convertToFormat(QImage::Format_RGBX64);
+                            tmpcolorimage.convertTo(QImage::Format_RGBX64);
                         }
                     }
 
@@ -803,6 +842,8 @@ bool QAVIFHandler::write(const QImage &image)
     avifRWData raw = AVIF_DATA_EMPTY;
     avifEncoder *encoder = avifEncoderCreate();
     encoder->maxThreads = qBound(1, QThread::idealThreadCount(), 64);
+
+#if AVIF_VERSION < 1000000
     encoder->minQuantizer = minQuantizer;
     encoder->maxQuantizer = maxQuantizer;
 
@@ -810,6 +851,17 @@ bool QAVIFHandler::write(const QImage &image)
         encoder->minQuantizerAlpha = AVIF_QUANTIZER_LOSSLESS;
         encoder->maxQuantizerAlpha = maxQuantizerAlpha;
     }
+#else
+    encoder->quality = m_quality;
+
+    if (image.hasAlphaChannel()) {
+        if (m_quality >= KIMG_AVIF_QUALITY_LOW) {
+            encoder->qualityAlpha = 100;
+        } else {
+            encoder->qualityAlpha = 100 - (KIMG_AVIF_QUALITY_LOW - m_quality) / 2;
+        }
+    }
+#endif
 
     encoder->speed = 6;
 
@@ -866,7 +918,7 @@ void QAVIFHandler::setOption(ImageOption option, const QVariant &value)
         if (m_quality > 100) {
             m_quality = 100;
         } else if (m_quality < 0) {
-            m_quality = 52;
+            m_quality = KIMG_AVIF_DEFAULT_QUALITY;
         }
         return;
     default:
@@ -1039,6 +1091,11 @@ int QAVIFHandler::loopCount() const
         return 0;
     }
 
+#if AVIF_VERSION >= 1000000
+    if (m_decoder->repetitionCount >= 0) {
+        return m_decoder->repetitionCount;
+    }
+#endif
     // Endless loop to work around https://github.com/AOMediaCodec/libavif/issues/347
     return -1;
 }

src/imageformats/exr.cpp

@@ -1,6 +1,5 @@
 /*
-    KImageIO Routines to read (and perhaps in the future, write) images
-    in the high dynamic range EXR format.
+    The high dynamic range EXR format support for QImage.
 
     SPDX-FileCopyrightText: 2003 Brad Hards <bradh@frogmouth.net>
     SPDX-FileCopyrightText: 2023 Mirco Miranda <mircomir@outlook.com>
@@ -16,15 +15,52 @@
  */
 //#define EXR_USE_LEGACY_CONVERSIONS // default commented -> you should define it in your cmake file
 
-/* *** EXR_ALLOW_LINEAR_COLORSPACE ***
- * If defined, the linear data is kept and it is the display program that
- * must convert to the monitor profile. Otherwise the data is converted to sRGB
- * to accommodate programs that do not support color profiles.
+/* *** EXR_CONVERT_TO_SRGB ***
+ * If defined, the linear data is converted to sRGB on read to accommodate
+ * programs that do not support color profiles.
+ * Otherwise the data are kept as is and it is the display program that
+ * must convert to the monitor profile.
  * NOTE: If EXR_USE_LEGACY_CONVERSIONS is active, this is ignored.
  */
-//#define EXR_ALLOW_LINEAR_COLORSPACE // default: commented -> you should define it in your cmake file
+//#define EXR_CONVERT_TO_SRGB // default: commented -> you should define it in your cmake file
+
+/* *** EXR_STORE_XMP_ATTRIBUTE ***
+ * If defined, disables the stores XMP values in a non-standard attribute named "xmp".
+ * The QImage metadata used is "XML:com.adobe.xmp".
+ * NOTE: The use of non-standard attributes is possible but discouraged by the specification. However,
+ *       metadata is essential for good image management and programs like darktable also set this
+ *       attribute. Gimp reads the "xmp" attribute and Darktable writes it as well.
+ */
+//#define EXR_DISABLE_XMP_ATTRIBUTE // default: commented -> you should define it in your cmake file
+
+/* *** EXR_MAX_IMAGE_WIDTH and EXR_MAX_IMAGE_HEIGHT ***
+ * The maximum size in pixel allowed by the plugin.
+ */
+#ifndef EXR_MAX_IMAGE_WIDTH
+#define EXR_MAX_IMAGE_WIDTH 300000
+#endif
+#ifndef EXR_MAX_IMAGE_HEIGHT
+#define EXR_MAX_IMAGE_HEIGHT EXR_MAX_IMAGE_WIDTH
+#endif
+
+/* *** EXR_LINES_PER_BLOCK ***
+ * Allows certain compression schemes to work in multithreading
+ * Requires up to "LINES_PER_BLOCK * MAX_IMAGE_WIDTH * 8"
+ * additional RAM (e.g. if 128, up to 307MiB of RAM).
+ * There is a performance gain with the following parameters (based on empirical tests):
+ * - PIZ compression needs 64+ lines
+ * - ZIPS compression needs 8+ lines
+ * - ZIP compression needs 32+ lines
+ * - Others not tested
+ *
+ * NOTE: The OpenEXR documentation states that the higher the better :)
+ */
+#ifndef EXR_LINES_PER_BLOCK
+#define EXR_LINES_PER_BLOCK 128
+#endif
 
 #include "exr_p.h"
+#include "scanlineconverter_p.h"
 #include "util_p.h"
 
 #include <IexThrowErrnoExc.h>
@@ -39,10 +75,9 @@
 #include <ImfInt64.h>
 #include <ImfIntAttribute.h>
 #include <ImfLineOrderAttribute.h>
+#include <ImfPreviewImage.h>
 #include <ImfRgbaFile.h>
 #include <ImfStandardAttributes.h>
-#include <ImfStringAttribute.h>
-#include <ImfVecAttribute.h>
 #include <ImfVersion.h>
 
 #include <iostream>
@@ -53,12 +88,13 @@
 #include <QFloat16>
 #include <QImage>
 #include <QImageIOPlugin>
-
+#include <QLocale>
+#include <QThread>
 #include <QTimeZone>
 
 // Allow the code to works on all QT versions supported by KDE
 // project (Qt 5.15 and Qt 6.x) to easy backports fixes.
-#if (QT_VERSION_MAJOR >= 6) && !defined(EXR_USE_LEGACY_CONVERSIONS)
+#if !defined(EXR_USE_LEGACY_CONVERSIONS)
 // If uncommented, the image is rendered in a float16 format, the result is very precise
 #define EXR_USE_QT6_FLOAT_IMAGE // default uncommented
 #endif
@@ -122,6 +158,57 @@ void K_IStream::clear()
     // TODO
 }
 
+class K_OStream : public Imf::OStream
+{
+public:
+    K_OStream(QIODevice *dev, const QByteArray &fileName)
+        : OStream(fileName.data())
+        , m_dev(dev)
+    {
+    }
+
+    void write(const char c[/*n*/], int n) override;
+#if OPENEXR_VERSION_MAJOR > 2
+    uint64_t tellp() override;
+    void seekp(uint64_t pos) override;
+#else
+    Imf::Int64 tellp() override;
+    void seekp(Imf::Int64 pos) override;
+#endif
+
+private:
+    QIODevice *m_dev;
+};
+
+void K_OStream::write(const char c[], int n)
+{
+    qint64 result = m_dev->write(c, n);
+    if (result > 0) {
+        return;
+    } else { // negative value {
+        Iex::throwErrnoExc("Error in write", result);
+    }
+    return;
+}
+
+#if OPENEXR_VERSION_MAJOR > 2
+uint64_t K_OStream::tellp()
+#else
+Imf::Int64 K_OStream::tellg()
+#endif
+{
+    return m_dev->pos();
+}
+
+#if OPENEXR_VERSION_MAJOR > 2
+void K_OStream::seekp(uint64_t pos)
+#else
+void K_OStream::seekg(Imf::Int64 pos)
+#endif
+{
+    m_dev->seek(pos);
+}
+
 #ifdef EXR_USE_LEGACY_CONVERSIONS
 // source: https://openexr.com/en/latest/ReadingAndWritingImageFiles.html
 inline unsigned char gamma(float x)
@@ -139,7 +226,14 @@ inline QRgb RgbaToQrgba(struct Imf::Rgba &imagePixel)
 #endif
 
 EXRHandler::EXRHandler()
+    : m_compressionRatio(-1)
+    , m_quality(-1)
+    , m_imageNumber(0)
+    , m_imageCount(0)
+    , m_startPos(-1)
 {
+    // Set the number of threads to use (0 is allowed)
+    Imf::setGlobalThreadCount(QThread::idealThreadCount() / 2);
 }
 
 bool EXRHandler::canRead() const
@@ -151,113 +245,574 @@ bool EXRHandler::canRead() const
     return false;
 }
 
+static QImage::Format imageFormat(const Imf::RgbaInputFile &file)
+{
+    auto isRgba = file.channels() & Imf::RgbaChannels::WRITE_A;
+#if defined(EXR_USE_LEGACY_CONVERSIONS)
+    return (isRgba ? QImage::Format_ARGB32 : QImage::Format_RGB32);
+#elif defined(EXR_USE_QT6_FLOAT_IMAGE)
+    return (isRgba ? QImage::Format_RGBA16FPx4 : QImage::Format_RGBX16FPx4);
+#else
+    return (isRgba ? QImage::Format_RGBA64 : QImage::Format_RGBX64);
+#endif
+}
+
+/*!
+ * \brief viewList
+ * \param header
+ * \return The list of available views.
+ */
+static QStringList viewList(const Imf::Header &h)
+{
+    QStringList l;
+    if (auto views = h.findTypedAttribute<Imf::StringVectorAttribute>("multiView")) {
+        for (auto &&v : views->value()) {
+            l << QString::fromStdString(v);
+        }
+    }
+    return l;
+}
+
+#ifdef QT_DEBUG
+void printAttributes(const Imf::Header &h)
+{
+    for (auto i = h.begin(); i != h.end(); ++i) {
+        qDebug() << i.name();
+    }
+}
+#endif
+
+/*!
+ * \brief readMetadata
+ * Reads EXR attributes from the \a header and set its as metadata in the \a image.
+ */
+static void readMetadata(const Imf::Header &header, QImage &image)
+{
+    // set some useful metadata
+    if (auto comments = header.findTypedAttribute<Imf::StringAttribute>("comments")) {
+        image.setText(QStringLiteral("Comment"), QString::fromStdString(comments->value()));
+    }
+
+    if (auto owner = header.findTypedAttribute<Imf::StringAttribute>("owner")) {
+        image.setText(QStringLiteral("Owner"), QString::fromStdString(owner->value()));
+    }
+
+    if (auto lat = header.findTypedAttribute<Imf::FloatAttribute>("latitude")) {
+        image.setText(QStringLiteral("Latitude"), QLocale::c().toString(lat->value()));
+    }
+
+    if (auto lon = header.findTypedAttribute<Imf::FloatAttribute>("longitude")) {
+        image.setText(QStringLiteral("Longitude"), QLocale::c().toString(lon->value()));
+    }
+
+    if (auto alt = header.findTypedAttribute<Imf::FloatAttribute>("altitude")) {
+        image.setText(QStringLiteral("Altitude"), QLocale::c().toString(alt->value()));
+    }
+
+    if (auto capDate = header.findTypedAttribute<Imf::StringAttribute>("capDate")) {
+        float off = 0;
+        if (auto utcOffset = header.findTypedAttribute<Imf::FloatAttribute>("utcOffset")) {
+            off = utcOffset->value();
+        }
+        auto dateTime = QDateTime::fromString(QString::fromStdString(capDate->value()), QStringLiteral("yyyy:MM:dd HH:mm:ss"));
+        if (dateTime.isValid()) {
+            dateTime.setTimeZone(QTimeZone::fromSecondsAheadOfUtc(off));
+            image.setText(QStringLiteral("CreationDate"), dateTime.toString(Qt::ISODate));
+        }
+    }
+
+    if (auto xDensity = header.findTypedAttribute<Imf::FloatAttribute>("xDensity")) {
+        float par = 1;
+        if (auto pixelAspectRatio = header.findTypedAttribute<Imf::FloatAttribute>("pixelAspectRatio")) {
+            par = pixelAspectRatio->value();
+        }
+        image.setDotsPerMeterX(qRound(xDensity->value() * 100.0 / 2.54));
+        image.setDotsPerMeterY(qRound(xDensity->value() * par * 100.0 / 2.54));
+    }
+
+    // Non-standard attribute
+    if (auto xmp = header.findTypedAttribute<Imf::StringAttribute>("xmp")) {
+        image.setText(QStringLiteral("XML:com.adobe.xmp"), QString::fromStdString(xmp->value()));
+    }
+
+    /* TODO: OpenEXR 3.2 metadata
+     *
+     * New Optional Standard Attributes:
+     * - Support automated editorial workflow:
+     *   reelName, imageCounter, ascFramingDecisionList
+     *
+     * - Support forensics (“which other shots used that camera and lens before the camera firmware was updated?”):
+     *   cameraMake, cameraModel, cameraSerialNumber, cameraFirmware, cameraUuid, cameraLabel, lensMake, lensModel,
+     *   lensSerialNumber, lensFirmware, cameraColorBalance
+     *
+     * -Support pickup shots (reproduce critical camera settings):
+     *   shutterAngle, cameraCCTSetting, cameraTintSetting
+     *
+     * - Support metadata-driven match move:
+     *   sensorCenterOffset, sensorOverallDimensions, sensorPhotositePitch, sensorAcquisitionRectanglenominalFocalLength,
+     *   effectiveFocalLength, pinholeFocalLength, entrancePupilOffset, tStop(complementing existing 'aperture')
+     */
+}
+
+/*!
+ * \brief readColorSpace
+ * Reads EXR chromaticities from the \a header and set its as color profile in the \a image.
+ */
+static void readColorSpace(const Imf::Header &header, QImage &image)
+{
+    // final color operations
+#ifndef EXR_USE_LEGACY_CONVERSIONS
+
+    QColorSpace cs;
+    if (auto chroma = header.findTypedAttribute<Imf::ChromaticitiesAttribute>("chromaticities")) {
+        auto &&v = chroma->value();
+        cs = QColorSpace(QPointF(v.white.x, v.white.y),
+                         QPointF(v.red.x, v.red.y),
+                         QPointF(v.green.x, v.green.y),
+                         QPointF(v.blue.x, v.blue.y),
+                         QColorSpace::TransferFunction::Linear);
+    }
+    if (!cs.isValid()) {
+        cs = QColorSpace(QColorSpace::SRgbLinear);
+    }
+    image.setColorSpace(cs);
+
+#ifdef EXR_CONVERT_TO_SRGB
+    image.convertToColorSpace(QColorSpace(QColorSpace::SRgb));
+#endif
+
+#endif // !EXR_USE_LEGACY_CONVERSIONS
+}
+
 bool EXRHandler::read(QImage *outImage)
 {
     try {
-        int width;
-        int height;
+        auto d = device();
 
-        K_IStream istr(device(), QByteArray());
+        // set the image position after the first run.
+        if (!d->isSequential()) {
+            if (m_startPos < 0) {
+                m_startPos = d->pos();
+            } else {
+                d->seek(m_startPos);
+            }
+        }
+
+        K_IStream istr(d, QByteArray());
         Imf::RgbaInputFile file(istr);
+        auto &&header = file.header();
+
+        // set the image to load
+        if (m_imageNumber > -1) {
+            auto views = viewList(header);
+            if (m_imageNumber < views.count()) {
+                file.setLayerName(views.at(m_imageNumber).toStdString());
+            }
+        }
+
+        // get image info
         Imath::Box2i dw = file.dataWindow();
-        bool isRgba = file.channels() & Imf::RgbaChannels::WRITE_A;
+        qint32 width = dw.max.x - dw.min.x + 1;
+        qint32 height = dw.max.y - dw.min.y + 1;
 
-        width = dw.max.x - dw.min.x + 1;
-        height = dw.max.y - dw.min.y + 1;
+        // limiting the maximum image size on a reasonable size (as done in other plugins)
+        if (width > EXR_MAX_IMAGE_WIDTH || height > EXR_MAX_IMAGE_HEIGHT) {
+            qWarning() << "The maximum image size is limited to" << EXR_MAX_IMAGE_WIDTH << "x" << EXR_MAX_IMAGE_HEIGHT << "px";
+            return false;
+        }
 
-#if defined(EXR_USE_LEGACY_CONVERSIONS)
-        QImage image = imageAlloc(width, height, isRgba ? QImage::Format_ARGB32 : QImage::Format_RGB32);
-#elif defined(EXR_USE_QT6_FLOAT_IMAGE)
-        QImage image = imageAlloc(width, height, isRgba ? QImage::Format_RGBA16FPx4 : QImage::Format_RGBX16FPx4);
-#else
-        QImage image = imageAlloc(width, height, isRgba ? QImage::Format_RGBA64 : QImage::Format_RGBX64);
-#endif
+        // creating the image
+        QImage image = imageAlloc(width, height, imageFormat(file));
         if (image.isNull()) {
             qWarning() << "Failed to allocate image, invalid size?" << QSize(width, height);
             return false;
         }
 
-        // set some useful metadata
-        auto &&h = file.header();
-        if (auto comments = h.findTypedAttribute<Imf::StringAttribute>("comments")) {
-            image.setText(QStringLiteral("Comment"), QString::fromStdString(comments->value()));
-        }
-        if (auto owner = h.findTypedAttribute<Imf::StringAttribute>("owner")) {
-            image.setText(QStringLiteral("Owner"), QString::fromStdString(owner->value()));
-        }
-        if (auto capDate = h.findTypedAttribute<Imf::StringAttribute>("capDate")) {
-            float off = 0;
-            if (auto utcOffset = h.findTypedAttribute<Imf::FloatAttribute>("utcOffset")) {
-                off = utcOffset->value();
-            }
-            auto dateTime = QDateTime::fromString(QString::fromStdString(capDate->value()), QStringLiteral("yyyy:MM:dd HH:mm:ss"));
-            if (dateTime.isValid()) {
-                dateTime.setTimeZone(QTimeZone::fromSecondsAheadOfUtc(off));
-                image.setText(QStringLiteral("Date"), dateTime.toString(Qt::ISODate));
-            }
-        }
-        if (auto xDensity = h.findTypedAttribute<Imf::FloatAttribute>("xDensity")) {
-            float par = 1;
-            if (auto pixelAspectRatio = h.findTypedAttribute<Imf::FloatAttribute>("pixelAspectRatio")) {
-                par = pixelAspectRatio->value();
-            }
-            image.setDotsPerMeterX(qRound(xDensity->value() * 100.0 / 2.54));
-            image.setDotsPerMeterY(qRound(xDensity->value() * par * 100.0 / 2.54));
-        }
-
-        Imf::Array<Imf::Rgba> pixels;
-        pixels.resizeErase(width);
+        Imf::Array2D<Imf::Rgba> pixels;
+        pixels.resizeErase(EXR_LINES_PER_BLOCK, width);
+        bool isRgba = image.hasAlphaChannel();
 
         // somehow copy pixels into image
-        for (int y = 0; y < height; ++y) {
+        for (int y = 0, n = 0; y < height; y += n) {
             auto my = dw.min.y + y;
-            if (my <= dw.max.y) { // paranoia check
-                file.setFrameBuffer(&pixels[0] - dw.min.x - qint64(my) * width, 1, width);
-                file.readPixels(my, my);
+            if (my > dw.max.y) { // paranoia check
+                break;
+            }
 
+            file.setFrameBuffer(&pixels[0][0] - dw.min.x - qint64(my) * width, 1, width);
+            file.readPixels(my, std::min(my + EXR_LINES_PER_BLOCK - 1, dw.max.y));
+
+            for (n = 0; n < std::min(EXR_LINES_PER_BLOCK, height - y); ++n) {
 #if defined(EXR_USE_LEGACY_CONVERSIONS)
-                auto scanLine = reinterpret_cast<QRgb *>(image.scanLine(y));
+                Q_UNUSED(isRgba)
+                auto scanLine = reinterpret_cast<QRgb *>(image.scanLine(y + n));
                 for (int x = 0; x < width; ++x) {
-                    *(scanLine + x) = RgbaToQrgba(pixels[x]);
+                    *(scanLine + x) = RgbaToQrgba(pixels[n][x]);
                 }
 #elif defined(EXR_USE_QT6_FLOAT_IMAGE)
-                auto scanLine = reinterpret_cast<qfloat16 *>(image.scanLine(y));
+                auto scanLine = reinterpret_cast<qfloat16 *>(image.scanLine(y + n));
                 for (int x = 0; x < width; ++x) {
                     auto xcs = x * 4;
-                    *(scanLine + xcs) = qfloat16(qBound(0.f, float(pixels[x].r), 1.f));
-                    *(scanLine + xcs + 1) = qfloat16(qBound(0.f, float(pixels[x].g), 1.f));
-                    *(scanLine + xcs + 2) = qfloat16(qBound(0.f, float(pixels[x].b), 1.f));
-                    *(scanLine + xcs + 3) = qfloat16(isRgba ? qBound(0.f, float(pixels[x].a), 1.f) : 1.f);
+                    *(scanLine + xcs) = qfloat16(qBound(0.f, float(pixels[n][x].r), 1.f));
+                    *(scanLine + xcs + 1) = qfloat16(qBound(0.f, float(pixels[n][x].g), 1.f));
+                    *(scanLine + xcs + 2) = qfloat16(qBound(0.f, float(pixels[n][x].b), 1.f));
+                    *(scanLine + xcs + 3) = qfloat16(isRgba ? qBound(0.f, float(pixels[n][x].a), 1.f) : 1.f);
                 }
 #else
-                auto scanLine = reinterpret_cast<QRgba64 *>(image.scanLine(y));
+                auto scanLine = reinterpret_cast<QRgba64 *>(image.scanLine(y + n));
                 for (int x = 0; x < width; ++x) {
-                    *(scanLine + x) = QRgba64::fromRgba64(quint16(qBound(0.f, float(pixels[x].r) * 65535.f + 0.5f, 65535.f)),
-                                                          quint16(qBound(0.f, float(pixels[x].g) * 65535.f + 0.5f, 65535.f)),
-                                                          quint16(qBound(0.f, float(pixels[x].b) * 65535.f + 0.5f, 65535.f)),
-                                                          isRgba ? quint16(qBound(0.f, float(pixels[x].a) * 65535.f + 0.5f, 65535.f)) : quint16(65535));
+                    *(scanLine + x) = QRgba64::fromRgba64(quint16(qBound(0.f, float(pixels[n][x].r) * 65535.f + 0.5f, 65535.f)),
+                                                          quint16(qBound(0.f, float(pixels[n][x].g) * 65535.f + 0.5f, 65535.f)),
+                                                          quint16(qBound(0.f, float(pixels[n][x].b) * 65535.f + 0.5f, 65535.f)),
+                                                          isRgba ? quint16(qBound(0.f, float(pixels[n][x].a) * 65535.f + 0.5f, 65535.f)) : quint16(65535));
                 }
 #endif
             }
         }
 
+        // set some useful metadata
+        readMetadata(header, image);
         // final color operations
-#ifndef EXR_USE_LEGACY_CONVERSIONS
-        image.setColorSpace(QColorSpace(QColorSpace::SRgbLinear));
-#ifndef EXR_ALLOW_LINEAR_COLORSPACE
-        image.convertToColorSpace(QColorSpace(QColorSpace::SRgb));
-#endif // !EXR_ALLOW_LINEAR_COLORSPACE
-#endif // !EXR_USE_LEGACY_CONVERSIONS
+        readColorSpace(header, image);
 
         *outImage = image;
 
         return true;
-    } catch (const std::exception &exc) {
-        //      qDebug() << exc.what();
+    } catch (const std::exception &) {
         return false;
     }
 }
 
+/*!
+ * \brief makePreview
+ * Creates a preview of maximum 256 x 256 pixels from the \a image.
+ */
+bool makePreview(const QImage &image, Imf::Array2D<Imf::PreviewRgba> &pixels)
+{
+    auto w = image.width();
+    auto h = image.height();
+
+    QImage preview;
+    if (w > h) {
+        preview = image.scaledToWidth(256).convertToFormat(QImage::Format_ARGB32);
+    } else {
+        preview = image.scaledToHeight(256).convertToFormat(QImage::Format_ARGB32);
+    }
+    if (preview.isNull()) {
+        return false;
+    }
+
+    w = preview.width();
+    h = preview.height();
+    pixels.resizeErase(h, w);
+    preview.convertToColorSpace(QColorSpace(QColorSpace::SRgb));
+
+    for (int y = 0; y < h; ++y) {
+        auto scanLine = reinterpret_cast<const QRgb *>(preview.constScanLine(y));
+        for (int x = 0; x < w; ++x) {
+            auto &&out = pixels[y][x];
+            out.r = qRed(*(scanLine + x));
+            out.g = qGreen(*(scanLine + x));
+            out.b = qBlue(*(scanLine + x));
+            out.a = qAlpha(*(scanLine + x));
+        }
+    }
+
+    return true;
+}
+
+/*!
+ * \brief setMetadata
+ * Reades the metadata from \a image and set its as attributes in the \a header.
+ */
+static void setMetadata(const QImage &image, Imf::Header &header)
+{
+    auto dateTime = QDateTime::currentDateTime();
+    for (auto &&key : image.textKeys()) {
+        auto text = image.text(key);
+        if (!key.compare(QStringLiteral("Comment"), Qt::CaseInsensitive)) {
+            header.insert("comments", Imf::StringAttribute(text.toStdString()));
+        }
+
+        if (!key.compare(QStringLiteral("Owner"), Qt::CaseInsensitive)) {
+            header.insert("owner", Imf::StringAttribute(text.toStdString()));
+        }
+
+        // clang-format off
+        if (!key.compare(QStringLiteral("Latitude"), Qt::CaseInsensitive) ||
+            !key.compare(QStringLiteral("Longitude"), Qt::CaseInsensitive) ||
+            !key.compare(QStringLiteral("Altitude"), Qt::CaseInsensitive)) {
+            // clang-format on
+            auto ok = false;
+            auto value = QLocale::c().toFloat(text, &ok);
+            if (ok) {
+                header.insert(qPrintable(key.toLower()), Imf::FloatAttribute(value));
+            }
+        }
+
+        if (!key.compare(QStringLiteral("CreationDate"), Qt::CaseInsensitive)) {
+            auto dt = QDateTime::fromString(text, Qt::ISODate);
+            if (dt.isValid()) {
+                dateTime = dt;
+            }
+        }
+
+#ifndef EXR_DISABLE_XMP_ATTRIBUTE // warning: Non-standard attribute!
+        if (!key.compare(QStringLiteral("XML:com.adobe.xmp"), Qt::CaseInsensitive)) {
+            header.insert("xmp", Imf::StringAttribute(text.toStdString()));
+        }
+#endif
+    }
+    if (dateTime.isValid()) {
+        header.insert("capDate", Imf::StringAttribute(dateTime.toString(QStringLiteral("yyyy:MM:dd HH:mm:ss")).toStdString()));
+        header.insert("utcOffset", Imf::FloatAttribute(dateTime.offsetFromUtc()));
+    }
+
+    if (image.dotsPerMeterX() && image.dotsPerMeterY()) {
+        header.insert("xDensity", Imf::FloatAttribute(image.dotsPerMeterX() * 2.54f / 100.f));
+        header.insert("pixelAspectRatio", Imf::FloatAttribute(float(image.dotsPerMeterX()) / float(image.dotsPerMeterY())));
+    }
+
+    // set default chroma (default constructor ITU-R BT.709-3 -> sRGB)
+    // The image is converted to Linear sRGB so, the chroma is the default EXR value.
+    // If a file doesn’t have a chromaticities attribute, display software should assume that the
+    // file’s primaries and the white point match Rec. ITU-R BT.709-3.
+    // header.insert("chromaticities", Imf::ChromaticitiesAttribute(Imf::Chromaticities()));
+
+    // TODO: EXR 3.2 attributes (see readMetadata())
+}
+
+bool EXRHandler::write(const QImage &image)
+{
+    try {
+        // create EXR header
+        qint32 width = image.width();
+        qint32 height = image.height();
+
+        // limiting the maximum image size on a reasonable size (as done in other plugins)
+        if (width > EXR_MAX_IMAGE_WIDTH || height > EXR_MAX_IMAGE_HEIGHT) {
+            qWarning() << "The maximum image size is limited to" << EXR_MAX_IMAGE_WIDTH << "x" << EXR_MAX_IMAGE_HEIGHT << "px";
+            return false;
+        }
+
+        Imf::Header header(width, height);
+        // set compression scheme (forcing PIZ as default)
+        header.compression() = Imf::Compression::PIZ_COMPRESSION;
+        if (m_compressionRatio >= qint32(Imf::Compression::NO_COMPRESSION) && m_compressionRatio < qint32(Imf::Compression::NUM_COMPRESSION_METHODS)) {
+            header.compression() = Imf::Compression(m_compressionRatio);
+        }
+        // set the DCT quality (used by DCT compressions only)
+        if (m_quality > -1 && m_quality <= 100) {
+            header.dwaCompressionLevel() = float(m_quality);
+        }
+        // make ZIP compression fast (used by ZIP compressions)
+        header.zipCompressionLevel() = 1;
+
+        // set preview (don't set it for small images)
+        if (width > 1024 || height > 1024) {
+            Imf::Array2D<Imf::PreviewRgba> previewPixels;
+            if (makePreview(image, previewPixels)) {
+                header.setPreviewImage(Imf::PreviewImage(previewPixels.width(), previewPixels.height(), &previewPixels[0][0]));
+            }
+        }
+
+        // set metadata (EXR attributes)
+        setMetadata(image, header);
+
+        // write the EXR
+        K_OStream ostr(device(), QByteArray());
+        auto channelsType = image.hasAlphaChannel() ? Imf::RgbaChannels::WRITE_RGBA : Imf::RgbaChannels::WRITE_RGB;
+        if (image.format() == QImage::Format_Mono ||
+            image.format() == QImage::Format_MonoLSB ||
+            image.format() == QImage::Format_Grayscale16 ||
+            image.format() == QImage::Format_Grayscale8) {
+            channelsType = Imf::RgbaChannels::WRITE_Y;
+        }
+        Imf::RgbaOutputFile file(ostr, header, channelsType);
+        Imf::Array2D<Imf::Rgba> pixels;
+        pixels.resizeErase(EXR_LINES_PER_BLOCK, width);
+
+        // convert the image and write into the stream
+#if defined(EXR_USE_QT6_FLOAT_IMAGE)
+        auto convFormat = image.hasAlphaChannel() ? QImage::Format_RGBA16FPx4 : QImage::Format_RGBX16FPx4;
+#else
+        auto convFormat = image.hasAlphaChannel() ? QImage::Format_RGBA64 : QImage::Format_RGBX64;
+#endif
+        ScanLineConverter slc(convFormat);
+        slc.setDefaultSourceColorSpace(QColorSpace(QColorSpace::SRgb));
+        slc.setTargetColorSpace(QColorSpace(QColorSpace::SRgbLinear));
+        for (int y = 0, n = 0; y < height; y += n) {
+            for (n = 0; n < std::min(EXR_LINES_PER_BLOCK, height - y); ++n) {
+#if defined(EXR_USE_QT6_FLOAT_IMAGE)
+                auto scanLine = reinterpret_cast<const qfloat16 *>(slc.convertedScanLine(image, y + n));
+                if (scanLine == nullptr) {
+                    return false;
+                }
+                for (int x = 0; x < width; ++x) {
+                    auto xcs = x * 4;
+                    pixels[n][x].r = float(*(scanLine + xcs));
+                    pixels[n][x].g = float(*(scanLine + xcs + 1));
+                    pixels[n][x].b = float(*(scanLine + xcs + 2));
+                    pixels[n][x].a = float(*(scanLine + xcs + 3));
+                }
+#else
+                auto scanLine = reinterpret_cast<const QRgba64 *>(slc.convertedScanLine(image, y + n));
+                if (scanLine == nullptr) {
+                    return false;
+                }
+                for (int x = 0; x < width; ++x) {
+                    pixels[n][x].r = float((scanLine + x)->red() / 65535.f);
+                    pixels[n][x].g = float((scanLine + x)->green() / 65535.f);
+                    pixels[n][x].b = float((scanLine + x)->blue() / 65535.f);
+                    pixels[n][x].a = float((scanLine + x)->alpha() / 65535.f);
+                }
+#endif
+            }
+            file.setFrameBuffer(&pixels[0][0] - qint64(y) * width, 1, width);
+            file.writePixels(n);
+        }
+    } catch (const std::exception &) {
+        return false;
+    }
+
+    return true;
+}
+
+void EXRHandler::setOption(ImageOption option, const QVariant &value)
+{
+    if (option == QImageIOHandler::CompressionRatio) {
+        auto ok = false;
+        auto cr = value.toInt(&ok);
+        if (ok) {
+            m_compressionRatio = cr;
+        }
+    }
+    if (option == QImageIOHandler::Quality) {
+        auto ok = false;
+        auto q = value.toInt(&ok);
+        if (ok) {
+            m_quality = q;
+        }
+    }
+}
+
+bool EXRHandler::supportsOption(ImageOption option) const
+{
+    if (option == QImageIOHandler::Size) {
+        return true;
+    }
+    if (option == QImageIOHandler::ImageFormat) {
+        return true;
+    }
+    if (option == QImageIOHandler::CompressionRatio) {
+        return true;
+    }
+    if (option == QImageIOHandler::Quality) {
+        return true;
+    }
+    return false;
+}
+
+QVariant EXRHandler::option(ImageOption option) const
+{
+    QVariant v;
+
+    if (option == QImageIOHandler::Size) {
+        if (auto d = device()) {
+            // transactions works on both random and sequential devices
+            d->startTransaction();
+            try {
+                K_IStream istr(d, QByteArray());
+                Imf::RgbaInputFile file(istr);
+                if (m_imageNumber > -1) { // set the image to read
+                    auto views = viewList(file.header());
+                    if (m_imageNumber < views.count()) {
+                        file.setLayerName(views.at(m_imageNumber).toStdString());
+                    }
+                }
+                Imath::Box2i dw = file.dataWindow();
+                v = QVariant(QSize(dw.max.x - dw.min.x + 1, dw.max.y - dw.min.y + 1));
+            } catch (const std::exception &) {
+                // broken file or unsupported version
+            }
+            d->rollbackTransaction();
+        }
+    }
+
+    if (option == QImageIOHandler::ImageFormat) {
+        if (auto d = device()) {
+            // transactions works on both random and sequential devices
+            d->startTransaction();
+            try {
+                K_IStream istr(d, QByteArray());
+                Imf::RgbaInputFile file(istr);
+                v = QVariant::fromValue(imageFormat(file));
+            } catch (const std::exception &) {
+                // broken file or unsupported version
+            }
+            d->rollbackTransaction();
+        }
+    }
+
+    if (option == QImageIOHandler::CompressionRatio) {
+        v = QVariant(m_compressionRatio);
+    }
+
+    if (option == QImageIOHandler::Quality) {
+        v = QVariant(m_quality);
+    }
+
+    return v;
+}
+
+bool EXRHandler::jumpToNextImage()
+{
+    return jumpToImage(m_imageNumber + 1);
+}
+
+bool EXRHandler::jumpToImage(int imageNumber)
+{
+    if (imageNumber < 0 || imageNumber >= imageCount()) {
+        return false;
+    }
+    m_imageNumber = imageNumber;
+    return true;
+}
+
+int EXRHandler::imageCount() const
+{
+    // NOTE: image count is cached for performance reason
+    auto &&count = m_imageCount;
+    if (count > 0) {
+        return count;
+    }
+
+    count = QImageIOHandler::imageCount();
+
+    auto d = device();
+    d->startTransaction();
+
+    try {
+        K_IStream istr(d, QByteArray());
+        Imf::RgbaInputFile file(istr);
+        auto views = viewList(file.header());
+        if (!views.isEmpty()) {
+            count = views.size();
+        }
+    } catch (const std::exception &) {
+        // do nothing
+    }
+
+    d->rollbackTransaction();
+
+    return count;
+}
+
+int EXRHandler::currentImageNumber() const
+{
+    return m_imageNumber;
+}
+
 bool EXRHandler::canRead(QIODevice *device)
 {
     if (!device) {
@@ -273,7 +828,7 @@ bool EXRHandler::canRead(QIODevice *device)
 QImageIOPlugin::Capabilities EXRPlugin::capabilities(QIODevice *device, const QByteArray &format) const
 {
     if (format == "exr") {
-        return Capabilities(CanRead);
+        return Capabilities(CanRead | CanWrite);
     }
     if (!format.isEmpty()) {
         return {};
@@ -286,6 +841,9 @@ QImageIOPlugin::Capabilities EXRPlugin::capabilities(QIODevice *device, const QB
     if (device->isReadable() && EXRHandler::canRead(device)) {
         cap |= CanRead;
     }
+    if (device->isWritable()) {
+        cap |= CanWrite;
+    }
     return cap;
 }
 

src/imageformats/exr_p.h

@@ -1,8 +1,8 @@
 /*
-    QImageIO Routines to read (and perhaps in the future, write) images
-    in the high definition EXR format.
+    The high dynamic range EXR format support for QImage.
 
     SPDX-FileCopyrightText: 2003 Brad Hards <bradh@frogmouth.net>
+    SPDX-FileCopyrightText: 2023 Mirco Miranda <mircomir@outlook.com>
 
     SPDX-License-Identifier: LGPL-2.0-or-later
 */
@@ -12,6 +12,44 @@
 
 #include <QImageIOPlugin>
 
+/*!
+ * \brief The EXRHandler class
+ * The handler uses the OpenEXR reference implementation of the EXR file format.
+ *
+ * The purpose of EXR format is to accurately and efficiently represent high-dynamic-range scene-linear
+ * image data and associated metadata.
+ *
+ * Both reading and writing of EXR files is supported. When saving, the image is converted to 16-bit
+ * and sRGB Linear color space (if not already so). If no color space is set in the image, sRGB is assumed.
+ * When the handler is compiled with the default compile options, the loaded image is a 16-bit image
+ * with linear color space.
+ * Multiview images are also supported (read only) via imageCount(), jumpToImage(), etc....
+ *
+ * The following QImageIOHandler options are supported:
+ * - ImageFormat: The image's data format returned by the handler.
+ * - Size: The size of the image.
+ * - CompressionRatio: The compression ratio of the image data (see OpenEXR compression schemes).
+ * - Quality: The quality level of the image (see OpenEXR compression level of lossy codecs).
+ *
+ * The following metadata are set/get via QImage::setText()/QImage::text() in both read/write (if any):
+ * - Latitude, Longitude, Altitude: Geographic coordinates (Float converted to string).
+ * - CreationDate: Date the image was captured/created (QDateTime converted to string using Qt::ISODate).
+ * - Comment: Additional image information in human-readable form, for example a verbal description of the image (QString).
+ * - Owner: Name of the owner of the image (QString).
+ *
+ * In addition, information about image resolution is preserved and the preview is written for images larger
+ * than 1024px.
+ *
+ * The following compile options are supported (defines):
+ * - EXR_MAX_IMAGE_WIDTH: Maximum image width supported (read/write, default: 300000 px).
+ * - EXR_MAX_IMAGE_HEIGHT: Maximum image height supported (read/write, default: 300000 px).
+ * - EXR_LINES_PER_BLOCK: The number of scanlines buffered on both read and write operations.\n
+ *                        The higher the value, the greater the parallelization but the RAM consumption increases (default: 128)
+ * - EXR_USE_LEGACY_CONVERSIONS: The result image is an 8-bit RGB(A) converted without icc profiles (read, default: undefined).
+ * - EXR_CONVERT_TO_SRGB: The resulting image is convertef in the sRGB color space (read, default: undefined).
+ * - EXR_DISABLE_XMP_ATTRIBUTE: Disable the stores of XMP values in a non-standard attribute named "xmp".\n
+ *                              The QImage metadata used is "XML:com.adobe.xmp" (write, default: undefined).
+ */
 class EXRHandler : public QImageIOHandler
 {
 public:
@@ -19,8 +57,65 @@ public:
 
     bool canRead() const override;
     bool read(QImage *outImage) override;
+    bool write(const 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:
+    /*!
+     * \brief m_compressionRatio
+     * Value set by QImageWriter::setCompression().
+     *
+     * The compression scheme is the same as defined by OpenEXR library:
+     * - 0: no compression
+     * - 1: run length encoding
+     * - 2: zlib compression, one scan line at a time
+     * - 3: zlib compression, in blocks of 16 scan lines
+     * - 4: piz-based wavelet compression (default)
+     * - 5: lossy 24-bit float compression
+     * - 6: lossy 4-by-4 pixel block compression, fixed compression rate
+     * - 7: lossy 4-by-4 pixel block compression, fields are compressed more
+     * - 8: lossy DCT based compression, in blocks of 32 scanlines. More efficient for partial buffer access.
+     * - 9: lossy DCT based compression, in blocks of 256 scanlines. More efficient space wise and faster to decode full frames than DWAA_COMPRESSION.
+     */
+    qint32 m_compressionRatio;
+
+    /*!
+     * \brief m_quality
+     * Value set by QImageWriter::setQuality().
+     *
+     * The quality is used on DCT compression schemes only with a
+     * supposed value between 0 and 100 (default: 45).
+     */
+    qint32 m_quality;
+
+    /*!
+     * \brief m_imageNumber
+     * Value set by QImageReader::jumpToImage() or QImageReader::jumpToNextImage().
+     * The number of view selected in a multiview image.
+     */
+    qint32 m_imageNumber;
+
+    /*!
+     * \brief m_imageCount
+     * The total number of views (cache value)
+     */
+    mutable qint32 m_imageCount;
+
+    /*!
+     * \brief m_startPos
+     * The initial device position to allow multi image load (cache value).
+     */
+    qint64 m_startPos;
 };
 
 class EXRPlugin : public QImageIOPlugin

src/imageformats/heif.cpp

@@ -22,6 +22,7 @@ size_t HEIFHandler::m_initialized_count = 0;
 bool HEIFHandler::m_plugins_queried = false;
 bool HEIFHandler::m_heif_decoder_available = false;
 bool HEIFHandler::m_heif_encoder_available = false;
+bool HEIFHandler::m_hej2_decoder_available = false;
 
 extern "C" {
 static struct heif_error heifhandler_write_callback(struct heif_context * /* ctx */, const void *data, size_t size, void *userdata)
@@ -59,12 +60,25 @@ HEIFHandler::HEIFHandler()
 
 bool HEIFHandler::canRead() const
 {
-    if (m_parseState == ParseHeicNotParsed && !canRead(device())) {
+    if (m_parseState == ParseHeicNotParsed) {
+        QIODevice *dev = device();
+        if (dev) {
+            const QByteArray header = dev->peek(28);
+
+            if (HEIFHandler::isSupportedBMFFType(header)) {
+                setFormat("heif");
+                return true;
+            }
+
+            if (HEIFHandler::isSupportedHEJ2(header)) {
+                setFormat("hej2");
+                return true;
+            }
+        }
         return false;
     }
 
     if (m_parseState != ParseHeicError) {
-        setFormat("heif");
         return true;
     }
     return false;
@@ -300,17 +314,6 @@ bool HEIFHandler::write_helper(const QImage &image)
     return true;
 }
 
-bool HEIFHandler::canRead(QIODevice *device)
-{
-    if (!device) {
-        qWarning("HEIFHandler::canRead() called with no device");
-        return false;
-    }
-
-    const QByteArray header = device->peek(28);
-    return HEIFHandler::isSupportedBMFFType(header);
-}
-
 bool HEIFHandler::isSupportedBMFFType(const QByteArray &header)
 {
     if (header.size() < 28) {
@@ -350,6 +353,22 @@ bool HEIFHandler::isSupportedBMFFType(const QByteArray &header)
     return false;
 }
 
+bool HEIFHandler::isSupportedHEJ2(const QByteArray &header)
+{
+    if (header.size() < 28) {
+        return false;
+    }
+
+    const char *buffer = header.constData();
+    if (qstrncmp(buffer + 4, "ftyp", 4) == 0) {
+        if (qstrncmp(buffer + 8, "j2ki", 4) == 0) {
+            return true;
+        }
+    }
+
+    return false;
+}
+
 QVariant HEIFHandler::option(ImageOption option) const
 {
     if (option == Quality) {
@@ -425,7 +444,7 @@ bool HEIFHandler::ensureDecoder()
     }
 
     const QByteArray buffer = device()->readAll();
-    if (!HEIFHandler::isSupportedBMFFType(buffer)) {
+    if (!HEIFHandler::isSupportedBMFFType(buffer) && !HEIFHandler::isSupportedHEJ2(buffer)) {
         m_parseState = ParseHeicError;
         return false;
     }
@@ -814,6 +833,9 @@ bool HEIFHandler::isHeifDecoderAvailable()
         }
 #endif
 
+#if LIBHEIF_HAVE_VERSION(1, 13, 0)
+        m_hej2_decoder_available = heif_have_decoder_for_format(heif_compression_JPEG2000);
+#endif
         m_heif_encoder_available = heif_have_encoder_for_format(heif_compression_HEVC);
         m_heif_decoder_available = heif_have_decoder_for_format(heif_compression_HEVC);
         m_plugins_queried = true;
@@ -839,6 +861,9 @@ bool HEIFHandler::isHeifEncoderAvailable()
         }
 #endif
 
+#if LIBHEIF_HAVE_VERSION(1, 13, 0)
+        m_hej2_decoder_available = heif_have_decoder_for_format(heif_compression_JPEG2000);
+#endif
         m_heif_decoder_available = heif_have_decoder_for_format(heif_compression_HEVC);
         m_heif_encoder_available = heif_have_encoder_for_format(heif_compression_HEVC);
         m_plugins_queried = true;
@@ -853,6 +878,34 @@ bool HEIFHandler::isHeifEncoderAvailable()
     return m_heif_encoder_available;
 }
 
+bool HEIFHandler::isHej2DecoderAvailable()
+{
+    QMutexLocker locker(&getHEIFHandlerMutex());
+
+    if (!m_plugins_queried) {
+#if LIBHEIF_HAVE_VERSION(1, 13, 0)
+        if (m_initialized_count == 0) {
+            heif_init(nullptr);
+        }
+#endif
+
+        m_heif_encoder_available = heif_have_encoder_for_format(heif_compression_HEVC);
+        m_heif_decoder_available = heif_have_decoder_for_format(heif_compression_HEVC);
+#if LIBHEIF_HAVE_VERSION(1, 13, 0)
+        m_hej2_decoder_available = heif_have_decoder_for_format(heif_compression_JPEG2000);
+#endif
+        m_plugins_queried = true;
+
+#if LIBHEIF_HAVE_VERSION(1, 13, 0)
+        if (m_initialized_count == 0) {
+            heif_deinit();
+        }
+#endif
+    }
+
+    return m_hej2_decoder_available;
+}
+
 void HEIFHandler::startHeifLib()
 {
 #if LIBHEIF_HAVE_VERSION(1, 13, 0)
@@ -901,6 +954,15 @@ QImageIOPlugin::Capabilities HEIFPlugin::capabilities(QIODevice *device, const Q
         }
         return format_cap;
     }
+
+    if (format == "hej2") {
+        Capabilities format_cap;
+        if (HEIFHandler::isHej2DecoderAvailable()) {
+            format_cap |= CanRead;
+        }
+        return format_cap;
+    }
+
     if (!format.isEmpty()) {
         return {};
     }
@@ -909,8 +971,16 @@ QImageIOPlugin::Capabilities HEIFPlugin::capabilities(QIODevice *device, const Q
     }
 
     Capabilities cap;
-    if (device->isReadable() && HEIFHandler::canRead(device) && HEIFHandler::isHeifDecoderAvailable()) {
-        cap |= CanRead;
+    if (device->isReadable()) {
+        const QByteArray header = device->peek(28);
+
+        if (HEIFHandler::isSupportedBMFFType(header) && HEIFHandler::isHeifDecoderAvailable()) {
+            cap |= CanRead;
+        }
+
+        if (HEIFHandler::isSupportedHEJ2(header) && HEIFHandler::isHej2DecoderAvailable()) {
+            cap |= CanRead;
+        }
     }
 
     if (device->isWritable() && HEIFHandler::isHeifEncoderAvailable()) {

src/imageformats/heif.json

@@ -1,4 +1,4 @@
 {
-    "Keys": [ "heif", "heic" ],
-    "MimeTypes": [ "image/heif", "image/heif" ]
+    "Keys": [ "heif", "heic", "hej2" ],
+    "MimeTypes": [ "image/heif", "image/heif", "image/hej2k" ]
 }

src/imageformats/heif_p.h

@@ -24,17 +24,18 @@ public:
     bool read(QImage *image) override;
     bool write(const QImage &image) override;
 
-    static bool canRead(QIODevice *device);
-
     QVariant option(ImageOption option) const override;
     void setOption(ImageOption option, const QVariant &value) override;
     bool supportsOption(ImageOption option) const override;
 
     static bool isHeifDecoderAvailable();
     static bool isHeifEncoderAvailable();
+    static bool isHej2DecoderAvailable();
+
+    static bool isSupportedBMFFType(const QByteArray &header);
+    static bool isSupportedHEJ2(const QByteArray &header);
 
 private:
-    static bool isSupportedBMFFType(const QByteArray &header);
     bool ensureParsed() const;
     bool ensureDecoder();
 
@@ -57,6 +58,7 @@ private:
     static bool m_plugins_queried;
     static bool m_heif_decoder_available;
     static bool m_heif_encoder_available;
+    static bool m_hej2_decoder_available;
 
     static QMutex &getHEIFHandlerMutex();
 };

src/imageformats/jxl_p.h

@@ -14,8 +14,8 @@
 #include <QImage>
 #include <QImageIOHandler>
 #include <QImageIOPlugin>
+#include <QList>
 #include <QVariant>
-#include <QVector>
 
 #include <jxl/decode.h>
 
@@ -71,7 +71,7 @@ private:
     void *m_runner;
     JxlBasicInfo m_basicinfo;
 
-    QVector<int> m_framedelays;
+    QList<int> m_framedelays;
     int m_next_image_delay;
 
     QImage m_current_image;

src/imageformats/psd.cpp

@@ -126,7 +126,7 @@ struct PSDDuotoneOptions {
  */
 struct PSDColorModeDataSection {
     PSDDuotoneOptions duotone;
-    QVector<QRgb> palette;
+    QList<QRgb> palette;
 };
 
 using PSDImageResourceSection = QHash<quint16, PSDImageResourceBlock>;
@@ -458,7 +458,7 @@ PSDColorModeDataSection readColorModeDataSection(QDataStream &s, bool *ok = null
     }
     else {              // read the palette (768 bytes)
         auto&& palette = cms.palette;
-        QVector<quint8> vect(size);
+        QList<quint8> vect(size);
         for (auto&& v : vect)
             s >> v;
         for (qsizetype i = 0, n = vect.size()/3; i < n; ++i)
@@ -631,7 +631,7 @@ static bool IsValid(const PSDHeader &header)
         qDebug() << "PSD header: invalid color mode" << header.color_mode;
         return false;
     }
-    // Specs tells: "Supported range is 1 to 56" but the limit is 57:
+    // Specs tells: "Supported range is 1 to 56" but when the alpha channel is present 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;
@@ -1109,7 +1109,7 @@ static bool LoadPSD(QDataStream &stream, const PSDHeader &header, QImage &img)
         return false;
     }
 
-    QVector<quint32> strides(header.height * header.channel_count, raw_count);
+    QList<quint32> strides(header.height * header.channel_count, raw_count);
     // Read the compressed stride sizes
     if (compression) {
         for (auto&& v : strides) {
@@ -1124,7 +1124,7 @@ static bool LoadPSD(QDataStream &stream, const PSDHeader &header, QImage &img)
     }
     // calculate the absolute file positions of each stride (required when a colorspace conversion should be done)
     auto device = stream.device();
-    QVector<quint64> stridePositions(strides.size());
+    QList<quint64> stridePositions(strides.size());
     if (!stridePositions.isEmpty()) {
         stridePositions[0] = device->pos();
     }

src/imageformats/ras.cpp

@@ -221,7 +221,7 @@ static bool LoadRAS(QDataStream &s, const RasHeader &ras, QImage &img)
 
     // Read palette if needed.
     if (ras.ColorMapType == RAS_COLOR_MAP_TYPE_RGB) {
-        QVector<quint8> palette(ras.ColorMapLength);
+        QList<quint8> palette(ras.ColorMapLength);
         for (quint32 i = 0; i < ras.ColorMapLength; ++i) {
             s >> palette[i];
         }

src/imageformats/raw.cpp

@@ -444,7 +444,9 @@ void setParams(QImageIOHandler *handler, LibRaw *rawProcessor)
     auto &&rawparams = rawProcessor->imgdata.rawparams;
 #endif
     // Select one raw image from input file (0 - first, ...)
-    rawparams.shot_select = handler->currentImageNumber();
+    if (handler->currentImageNumber() > -1) {
+        rawparams.shot_select = handler->currentImageNumber();
+    }
 
     // *** Set processing parameters
 
@@ -722,6 +724,7 @@ RAWHandler::RAWHandler()
     : m_imageNumber(0)
     , m_imageCount(0)
     , m_quality(-1)
+    , m_startPos(-1)
 {
 }
 
@@ -738,6 +741,15 @@ bool RAWHandler::read(QImage *image)
 {
     auto dev = device();
 
+    // set the image position after the first run.
+    if (!dev->isSequential()) {
+        if (m_startPos < 0) {
+            m_startPos = dev->pos();
+        } else {
+            dev->seek(m_startPos);
+        }
+    }
+
     // Check image file format.
     if (dev->atEnd()) {
         return false;
@@ -819,7 +831,7 @@ bool RAWHandler::jumpToNextImage()
 
 bool RAWHandler::jumpToImage(int imageNumber)
 {
-    if (imageNumber >= imageCount()) {
+    if (imageNumber < 0 || imageNumber >= imageCount()) {
         return false;
     }
     m_imageNumber = imageNumber;

src/imageformats/raw_p.h

@@ -74,6 +74,12 @@ private:
      * When the quality is -1, default quality is used.
      */
     qint32 m_quality;
+
+    /*!
+     * \brief m_startPos
+     * The initial device position to allow multi image load (cache value).
+     */
+    qint64 m_startPos;
 };
 
 class RAWPlugin : public QImageIOPlugin

src/imageformats/rgb.cpp

@@ -22,13 +22,13 @@
 #include "rgb_p.h"
 #include "util_p.h"
 
+#include <QList>
 #include <QMap>
-#include <QVector>
 
 #include <QDebug>
 #include <QImage>
 
-class RLEData : public QVector<uchar>
+class RLEData : public QList<uchar>
 {
 public:
     RLEData()
@@ -61,7 +61,7 @@ public:
     {
     }
     uint insert(const uchar *d, uint l);
-    QVector<const RLEData *> vector();
+    QList<const RLEData *> vector();
     void setBaseOffset(uint o)
     {
         _offset = o;
@@ -107,7 +107,7 @@ private:
     QByteArray _data;
     QByteArray::Iterator _pos;
     RLEMap _rlemap;
-    QVector<const RLEData *> _rlevector;
+    QList<const RLEData *> _rlevector;
     uint _numrows;
 
     bool readData(QImage &);
@@ -421,9 +421,9 @@ uint RLEMap::insert(const uchar *d, uint l)
     return QMap<RLEData, uint>::insert(data, _counter++).value();
 }
 
-QVector<const RLEData *> RLEMap::vector()
+QList<const RLEData *> RLEMap::vector()
 {
-    QVector<const RLEData *> v(size());
+    QList<const RLEData *> v(size());
     for (Iterator it = begin(); it != end(); ++it) {
         v.replace(it.value(), &it.key());
     }

src/imageformats/scanlineconverter.cpp

@@ -15,13 +15,15 @@ ScanLineConverter::ScanLineConverter(const QImage::Format &targetFormat)
 ScanLineConverter::ScanLineConverter(const ScanLineConverter &other)
     : _targetFormat(other._targetFormat)
     , _colorSpace(other._colorSpace)
+    , _defaultColorSpace(other._defaultColorSpace)
 {
 }
 
 ScanLineConverter &ScanLineConverter::operator=(const ScanLineConverter &other)
 {
-    this->_targetFormat = other._targetFormat;
-    this->_colorSpace = other._colorSpace;
+    _targetFormat = other._targetFormat;
+    _colorSpace = other._colorSpace;
+    _defaultColorSpace = other._defaultColorSpace;
     return (*this);
 }
 
@@ -40,24 +42,51 @@ QColorSpace ScanLineConverter::targetColorSpace() const
     return _colorSpace;
 }
 
+void ScanLineConverter::setDefaultSourceColorSpace(const QColorSpace &colorSpace)
+{
+    _defaultColorSpace = colorSpace;
+}
+
+QColorSpace ScanLineConverter::defaultSourceColorSpace() const
+{
+    return _defaultColorSpace;
+}
+
 const uchar *ScanLineConverter::convertedScanLine(const QImage &image, qint32 y)
 {
-    auto colorSpaceConversion = isColorSpaceConversionNeeded(image, _colorSpace);
+    auto colorSpaceConversion = isColorSpaceConversionNeeded(image);
     if (image.format() == _targetFormat && !colorSpaceConversion) {
         return image.constScanLine(y);
     }
     if (image.width() != _tmpBuffer.width() || image.format() != _tmpBuffer.format()) {
         _tmpBuffer = QImage(image.width(), 1, image.format());
+        _tmpBuffer.setColorTable(image.colorTable());
     }
     if (_tmpBuffer.isNull()) {
         return nullptr;
     }
     std::memcpy(_tmpBuffer.bits(), image.constScanLine(y), std::min(_tmpBuffer.bytesPerLine(), image.bytesPerLine()));
+    auto tmp = _tmpBuffer;
     if (colorSpaceConversion) {
-        _tmpBuffer.setColorSpace(image.colorSpace());
-        _tmpBuffer.convertToColorSpace(_colorSpace);
+        auto cs = image.colorSpace();
+        if (!cs.isValid()) {
+            cs = _defaultColorSpace;
+        }
+        if (tmp.depth() < 24) {
+            tmp.convertTo(tmp.hasAlphaChannel() ? QImage::Format_ARGB32 : QImage::Format_RGB32);
+        }
+        tmp.setColorSpace(cs);
+        tmp.convertToColorSpace(_colorSpace);
     }
-    _convBuffer = _tmpBuffer.convertToFormat(_targetFormat);
+
+    /*
+     * Work Around for wrong RGBA64 -> 16FPx4/32FPx4 conversion on Intel architecture.
+     * Luckily convertTo() works fine with 16FPx4 images so I can use it instead convertToFormat().
+     * See also: https://bugreports.qt.io/browse/QTBUG-120614
+     */
+    tmp.convertTo(_targetFormat);
+    _convBuffer = tmp;
+
     if (_convBuffer.isNull()) {
         return nullptr;
     }
@@ -72,12 +101,12 @@ qsizetype ScanLineConverter::bytesPerLine() const
     return _convBuffer.bytesPerLine();
 }
 
-bool ScanLineConverter::isColorSpaceConversionNeeded(const QImage &image, const QColorSpace &targetColorSpace) const
+bool ScanLineConverter::isColorSpaceConversionNeeded(const QImage &image, const QColorSpace &targetColorSpace, const QColorSpace &defaultColorSpace)
 {
-    if (image.depth() < 24) { // RGB 8 bit or grater only
-        return false;
-    }
     auto sourceColorSpace = image.colorSpace();
+    if (!sourceColorSpace.isValid()) {
+        sourceColorSpace = defaultColorSpace;
+    }
     if (!sourceColorSpace.isValid() || !targetColorSpace.isValid()) {
         return false;
     }

src/imageformats/scanlineconverter_p.h

@@ -42,6 +42,14 @@ public:
     void setTargetColorSpace(const QColorSpace &colorSpace);
     QColorSpace targetColorSpace() const;
 
+    /*!
+     * \brief setDefaultSourceColorSpace
+     * Set the source color space to use when the image does not have a color space.
+     * \param colorSpace
+     */
+    void setDefaultSourceColorSpace(const QColorSpace &colorSpace);
+    QColorSpace defaultSourceColorSpace() const;
+
     /*!
      * \brief convertedScanLine
      * Convert the scanline \a y.
@@ -62,14 +70,24 @@ public:
      * \note Only 24 bit or grater images.
      * \param image The source image.
      * \param targetColorSpace The target color space.
+     * \param defaultColorSpace The default color space to use it image does not contains one.
      * \return True if the conversion should be done otherwise false.
      */
-    bool isColorSpaceConversionNeeded(const QImage &image, const QColorSpace &targetColorSpace) const;
+    static bool isColorSpaceConversionNeeded(const QImage &image, const QColorSpace &targetColorSpace, const QColorSpace &defaultColorSpace = QColorSpace());
+
+    /*!
+     * \brief isColorSpaceConversionNeeded
+     */
+    inline bool isColorSpaceConversionNeeded(const QImage &image) const
+    {
+        return isColorSpaceConversionNeeded(image, _colorSpace, _defaultColorSpace);
+    }
 
 private:
     // data
     QImage::Format _targetFormat;
     QColorSpace _colorSpace;
+    QColorSpace _defaultColorSpace;
 
     // internal buffers
     QImage _tmpBuffer;

src/imageformats/tga.cpp

@@ -88,10 +88,6 @@ static QDataStream &operator>>(QDataStream &s, TgaHeader &head)
     s >> head.height;
     s >> head.pixel_size;
     s >> head.flags;
-    /*qDebug() << "id_length: " << head.id_length << " - colormap_type: " << head.colormap_type << " - image_type: " << head.image_type;
-    qDebug() << "colormap_index: " << head.colormap_index << " - colormap_length: " << head.colormap_length << " - colormap_size: " << head.colormap_size;
-    qDebug() << "x_origin: " << head.x_origin << " - y_origin: " << head.y_origin << " - width:" << head.width << " - height:" << head.height << " - pixelsize:
-    " << head.pixel_size << " - flags: " << head.flags;*/
     return s;
 }
 
@@ -117,6 +113,10 @@ static bool IsSupported(const TgaHeader &head)
     if (head.pixel_size != 8 && head.pixel_size != 16 && head.pixel_size != 24 && head.pixel_size != 32) {
         return false;
     }
+    // If the colormap_type field is set to zero, indicating that no color map exists, then colormap_size, colormap_index and colormap_length should be set to zero.
+    if (head.colormap_type == 0 && (head.colormap_size != 0 || head.colormap_index != 0 || head.colormap_length != 0)) {
+        return false;
+    }
     return true;
 }
 
@@ -170,10 +170,57 @@ struct TgaHeaderInfo {
     }
 };
 
+static QImage::Format imageFormat(const TgaHeader &head)
+{
+    auto format = QImage::Format_Invalid;
+    if (IsSupported(head)) {
+        // Bits 0-3 are the numbers of alpha bits (can be zero!)
+        const int numAlphaBits = head.flags & 0xf;
+        // However alpha exists only in the 32 bit format.
+        if ((head.pixel_size == 32) && (head.flags & 0xf)) {
+            if (numAlphaBits <= 8) {
+                format = QImage::Format_ARGB32;
+            }
+        }
+        else {
+            format = QImage::Format_RGB32;
+        }
+    }
+    return format;
+}
+
+/*!
+ * \brief peekHeader
+ * Reads the header but does not change the position in the device.
+ */
+static bool peekHeader(QIODevice *device, TgaHeader &header)
+{
+    qint64 oldPos = device->pos();
+    QByteArray head = device->read(TgaHeader::SIZE);
+    int readBytes = head.size();
+
+    if (device->isSequential()) {
+        for (int pos = readBytes - 1; pos >= 0; --pos) {
+            device->ungetChar(head[pos]);
+        }
+    } else {
+        device->seek(oldPos);
+    }
+
+    if (readBytes < TgaHeader::SIZE) {
+        return false;
+    }
+
+    QDataStream stream(head);
+    stream.setByteOrder(QDataStream::LittleEndian);
+    stream >> header;
+
+    return true;
+}
+
 static bool LoadTGA(QDataStream &s, const TgaHeader &tga, QImage &img)
 {
-    // Create image.
-    img = imageAlloc(tga.width, tga.height, QImage::Format_RGB32);
+    img = imageAlloc(tga.width, tga.height, imageFormat(tga));
     if (img.isNull()) {
         qWarning() << "Failed to allocate image, invalid dimensions?" << QSize(tga.width, tga.height);
         return false;
@@ -181,21 +228,7 @@ static bool LoadTGA(QDataStream &s, const TgaHeader &tga, QImage &img)
 
     TgaHeaderInfo info(tga);
 
-    // Bits 0-3 are the numbers of alpha bits (can be zero!)
     const int numAlphaBits = tga.flags & 0xf;
-    // However alpha exists only in the 32 bit format.
-    if ((tga.pixel_size == 32) && (tga.flags & 0xf)) {
-        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;
-        }
-
-        if (numAlphaBits > 8) {
-            return false;
-        }
-    }
-
     uint pixel_size = (tga.pixel_size / 8);
     qint64 size = qint64(tga.width) * qint64(tga.height) * pixel_size;
 
@@ -391,23 +424,25 @@ bool TGAHandler::read(QImage *outImage)
 {
     // qDebug() << "Loading TGA file!";
 
-    QDataStream s(device());
-    s.setByteOrder(QDataStream::LittleEndian);
-
-    // Read image header.
+    auto d = device();
     TgaHeader tga;
-    s >> tga;
-    s.device()->seek(TgaHeader::SIZE + tga.id_length);
-
-    // Check image file format.
-    if (s.atEnd()) {
+    if (!peekHeader(d, tga) || !IsSupported(tga)) {
         //         qDebug() << "This TGA file is not valid.";
         return false;
     }
 
-    // Check supported file types.
-    if (!IsSupported(tga)) {
-        //         qDebug() << "This TGA file is not supported.";
+    if (d->isSequential()) {
+        d->read(TgaHeader::SIZE + tga.id_length);
+    } else {
+        d->seek(TgaHeader::SIZE + tga.id_length);
+    }
+
+    QDataStream s(d);
+    s.setByteOrder(QDataStream::LittleEndian);
+
+    // Check image file format.
+    if (s.atEnd()) {
+        //         qDebug() << "This TGA file is not valid.";
         return false;
     }
 
@@ -468,6 +503,42 @@ bool TGAHandler::write(const QImage &image)
     return true;
 }
 
+bool TGAHandler::supportsOption(ImageOption option) const
+{
+    if (option == QImageIOHandler::Size) {
+        return true;
+    }
+    if (option == QImageIOHandler::ImageFormat) {
+        return true;
+    }
+    return false;
+}
+
+QVariant TGAHandler::option(ImageOption option) const
+{
+    QVariant v;
+
+    if (option == QImageIOHandler::Size) {
+        if (auto d = device()) {
+            TgaHeader header;
+            if (peekHeader(d, header) && IsSupported(header)) {
+                v = QVariant::fromValue(QSize(header.width, header.height));
+            }
+        }
+    }
+
+    if (option == QImageIOHandler::ImageFormat) {
+        if (auto d = device()) {
+            TgaHeader header;
+            if (peekHeader(d, header) && IsSupported(header)) {
+                v = QVariant::fromValue(imageFormat(header));
+            }
+        }
+    }
+
+    return v;
+}
+
 bool TGAHandler::canRead(QIODevice *device)
 {
     if (!device) {
@@ -491,10 +562,12 @@ bool TGAHandler::canRead(QIODevice *device)
         return false;
     }
 
-    QDataStream stream(head);
-    stream.setByteOrder(QDataStream::LittleEndian);
     TgaHeader tga;
-    stream >> tga;
+    if (!peekHeader(device, tga)) {
+        qWarning("TGAHandler::canRead() error while reading the header");
+        return false;
+    }
+
     return IsSupported(tga);
 }
 

src/imageformats/tga_p.h

@@ -19,6 +19,9 @@ public:
     bool read(QImage *image) override;
     bool write(const QImage &image) override;
 
+    bool supportsOption(QImageIOHandler::ImageOption option) const override;
+    QVariant option(QImageIOHandler::ImageOption option) const override;
+
     static bool canRead(QIODevice *device);
 };
 

src/imageformats/util_p.h

@@ -13,7 +13,7 @@
 #include <QImage>
 #include <QImageIOHandler>
 
-// QVector uses some extra space for stuff, hence the 32 here suggested by Thiago Macieira
+// QList 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()

src/imageformats/xcf.cpp

@@ -14,18 +14,12 @@
 #include <QIODevice>
 #include <QImage>
 #include <QImageReader>
+#include <QList>
 #include <QLoggingCategory>
 #include <QPainter>
 #include <QStack>
-#include <QVector>
 #include <QtEndian>
 
-#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
-// To test the plugin with OSS FUZZ (in 2023) you need to make it compatible with Qt 5.
-// The plugin has been made compatible with all Qt (5 and 6) versions supported by the KDE project.
-#define XCF_QT5_SUPPORT
-#endif
-
 #ifndef XCF_QT5_SUPPORT
 // Float images are not supported by Qt 5 and can be disabled in QT 6 to reduce memory usage.
 // Unfortunately enabling/disabling this define results in slightly different images, so leave the default if possible.
@@ -116,7 +110,7 @@ struct RandomTable {
  * parallel processing on a tile-by-tile basis. Here, though,
  * we just read them in en-masse and store them in a matrix.
  */
-typedef QVector<QVector<QImage>> Tiles;
+typedef QList<QList<QImage>> Tiles;
 
 class XCFImageFormat
 {
@@ -498,7 +492,7 @@ public:
         qint32 tattoo; //!< (unique identifier?)
         quint32 unit; //!< Units of The GIMP (inch, mm, pica, etc...)
         qint32 num_colors = 0; //!< number of colors in an indexed image
-        QVector<QRgb> palette; //!< indexed image color palette
+        QList<QRgb> palette; //!< indexed image color palette
 
         int num_layers; //!< number of layers
         Layer layer; //!< most recently read layer
@@ -551,7 +545,7 @@ private:
     //! This table is used as a shared grayscale ramp to be set on grayscale
     //! images. This is because Qt does not differentiate between indexed and
     //! grayscale images.
-    static QVector<QRgb> grayTable;
+    static QList<QRgb> grayTable;
 
     //! This table provides the add_pixel saturation values (i.e. 250 + 250 = 255).
     // static int add_lut[256][256]; - this is so lame waste of 256k of memory
@@ -652,7 +646,7 @@ bool XCFImageFormat::random_table_initialized;
 
 constexpr RandomTable XCFImageFormat::randomTable;
 
-QVector<QRgb> XCFImageFormat::grayTable;
+QList<QRgb> XCFImageFormat::grayTable;
 
 bool XCFImageFormat::modeAffectsSourceAlpha(const quint32 type)
 {
@@ -966,7 +960,11 @@ bool XCFImageFormat::loadImageProperties(QDataStream &xcf_io, XCFImage &xcf_imag
         case PROP_PARASITES:
             while (!property.atEnd()) {
                 char *tag;
+#if QT_VERSION < QT_VERSION_CHECK(6, 7, 0)
                 quint32 size;
+#else
+                qint64 size;
+#endif
 
                 property.readBytes(tag, size);
 
@@ -999,7 +997,7 @@ bool XCFImageFormat::loadImageProperties(QDataStream &xcf_io, XCFImage &xcf_imag
                 return false;
             }
 
-            xcf_image.palette = QVector<QRgb>();
+            xcf_image.palette = QList<QRgb>();
             xcf_image.palette.reserve(xcf_image.num_colors);
 
             for (int i = 0; i < xcf_image.num_colors; i++) {
@@ -2019,7 +2017,7 @@ bool XCFImageFormat::loadLevel(QDataStream &xcf_io, Layer &layer, qint32 bpp, co
 
     const uint blockSize = TILE_WIDTH * TILE_HEIGHT * bpp * 1.5;
 
-    QVector<uchar> buffer;
+    QList<uchar> buffer;
     if (needConvert) {
         buffer.resize(blockSize * (bpp == 2 ? 2 : 1));
     }