GIT_SILENT Upgrade ECM and KF version requirements for 5.115.0 release.

Backported from master

.gitlab-ci.yml

@@ -2,9 +2,11 @@
 # SPDX-License-Identifier: CC0-1.0
 
 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/windows.yml
-  - https://invent.kde.org/sysadmin/ci-utilities/raw/master/gitlab-templates/windows-static.yml
+  - project: sysadmin/ci-utilities
+    file:
+      - /gitlab-templates/linux.yml
+      - /gitlab-templates/linux-static.yml
+      - /gitlab-templates/android.yml
+      - /gitlab-templates/freebsd.yml
+      - /gitlab-templates/windows.yml
+      - /gitlab-templates/windows-static.yml

CMakeLists.txt

@@ -3,7 +3,7 @@ cmake_minimum_required(VERSION 3.16)
 project(KImageFormats)
 
 include(FeatureSummary)
-find_package(ECM 5.109.0  NO_MODULE)
+find_package(ECM 5.115.0  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)
 
@@ -51,7 +51,10 @@ set_package_properties(OpenEXR PROPERTIES
     PURPOSE "Required for the QImage plugin for OpenEXR images"
 )
 
-find_package(libavif 0.8.2 CONFIG)
+find_package(libavif 0.8.2 CONFIG QUIET)
+if(NOT libavif_FOUND)
+    find_package(libavif 1 CONFIG)
+endif()
 set_package_properties(libavif PROPERTIES
     TYPE OPTIONAL
     PURPOSE "Required for the QImage plugin for AVIF images"

README.md

@@ -14,11 +14,12 @@ image formats.
 The following image formats have read-only support:
 
 - Animated Windows cursors (ani)
+- Camera RAW images (arw, cr2, cr3, dcs, dng, ...)
 - Gimp (xcf)
 - OpenEXR (exr)
 - Photoshop documents (psd, psb, pdd, psdt)
+- Radiance HDR (hdr)
 - Sun Raster (ras)
-- Camera RAW images (arw, cr2, cr3, dcs, dng, ...)
 
 The following image formats have read and write support:
 
@@ -26,6 +27,7 @@ The following image formats have read and write support:
 - Encapsulated PostScript (eps)
 - JPEG XL (jxl)
 - Personal Computer Exchange (pcx)
+- Quite OK Image format (qoi)
 - SGI images (rgb, rgba, sgi, bw)
 - Softimage PIC (pic)
 - Targa (tga): supports more formats than Qt's version

autotests/CMakeLists.txt

@@ -1,7 +1,6 @@
 #find_package(Qt5Test ${REQUIRED_QT_VERSION} NO_MODULE)
 
 include(ECMMarkAsTest)
-include(CMakeParseArguments)
 
 add_definitions(-DPLUGIN_DIR="${CMAKE_CURRENT_BINARY_DIR}/../bin")
 remove_definitions(-DQT_NO_CAST_FROM_ASCII)
@@ -70,6 +69,7 @@ kimageformats_read_tests(
     hdr
     pcx
     psd
+    qoi
     ras
     rgb
     tga
@@ -99,6 +99,12 @@ 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)
@@ -125,6 +131,7 @@ kimageformats_read_tests(FUZZ 1
 kimageformats_write_tests(
     pcx-lossless
     pic-lossless
+    qoi-lossless
     rgb-lossless
     tga # fixme: the alpha images appear not to be written properly
 )

src/imageformats/AUTHORS

@@ -12,3 +12,4 @@ Ignacio Castaño <castano@ludicon.com> -- DDS and PDS format reader.
 Christoph Hormann <chris_hormann@gmx.de> -- HDR format read support.
 Michael Ritzert <kde@ritzert.de> -- JPEG 2000 format read/write support
 Troy Unrau <troy@kde.org> -- Sun RASter read support
+Ernest Gupik <ernestgupik@wp.pl> -- QOI format read support

src/imageformats/CMakeLists.txt

@@ -133,6 +133,13 @@ endif()
 
 ##################################
 
+kimageformats_add_plugin(kimg_qoi SOURCES qoi.cpp scanlineconverter.cpp)
+if (QT_MAJOR_VERSION STREQUAL "5")
+    install(FILES qoi.desktop DESTINATION ${KDE_INSTALL_KSERVICESDIR}/qimageioplugins/)
+endif()
+
+##################################
+
 kimageformats_add_plugin(kimg_ras SOURCES ras.cpp)
 if (QT_MAJOR_VERSION STREQUAL "5")
     install(FILES ras.desktop DESTINATION ${KDE_INSTALL_KSERVICESDIR}/qimageioplugins/)

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;
@@ -424,7 +453,7 @@ bool QAVIFHandler::decode_one_frame()
     }
 
     if (m_decoder->image->transformFlags & AVIF_TRANSFORM_IMIR) {
-#if AVIF_VERSION > 90100
+#if AVIF_VERSION > 90100 && AVIF_VERSION < 1000000
         switch (m_decoder->image->imir.mode) {
 #else
         switch (m_decoder->image->imir.axis) {
@@ -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

@@ -3,10 +3,27 @@
     in the high dynamic range EXR format.
 
     SPDX-FileCopyrightText: 2003 Brad Hards <bradh@frogmouth.net>
+    SPDX-FileCopyrightText: 2023 Mirco Miranda <mircomir@outlook.com>
 
     SPDX-License-Identifier: LGPL-2.0-or-later
 */
 
+/* *** EXR_USE_LEGACY_CONVERSIONS ***
+ * If defined, the result image is an 8-bit RGB(A) converted
+ * without icc profiles. Otherwise, a 16-bit images is generated.
+ * NOTE: The use of legacy conversions are discouraged due to
+ *       imprecise image result.
+ */
+//#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.
+ * 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
+
 #include "exr_p.h"
 #include "util_p.h"
 
@@ -30,11 +47,24 @@
 
 #include <iostream>
 
+#include <QColorSpace>
 #include <QDataStream>
 #include <QDebug>
+#include <QFloat16>
 #include <QImage>
 #include <QImageIOPlugin>
 
+#if QT_VERSION >= QT_VERSION_CHECK(6, 5, 0)
+#include <QTimeZone>
+#endif
+
+// 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 uncommented, the image is rendered in a float16 format, the result is very precise
+#define EXR_USE_QT6_FLOAT_IMAGE // default uncommented
+#endif
+
 class K_IStream : public Imf::IStream
 {
 public:
@@ -94,77 +124,21 @@ void K_IStream::clear()
     // TODO
 }
 
-/* this does a conversion from the ILM Half (equal to Nvidia Half)
- * format into the normal 32 bit pixel format. Process is from the
- * ILM code.
- */
-QRgb RgbaToQrgba(struct Imf::Rgba &imagePixel)
+#ifdef EXR_USE_LEGACY_CONVERSIONS
+// source: https://openexr.com/en/latest/ReadingAndWritingImageFiles.html
+inline unsigned char gamma(float x)
 {
-    float r;
-    float g;
-    float b;
-    float a;
-
-    //  1) Compensate for fogging by subtracting defog
-    //     from the raw pixel values.
-    // Response: We work with defog of 0.0, so this is a no-op
-
-    //  2) Multiply the defogged pixel values by
-    //     2^(exposure + 2.47393).
-    // Response: We work with exposure of 0.0.
-    // (2^2.47393) is 5.55555
-    r = imagePixel.r * 5.55555;
-    g = imagePixel.g * 5.55555;
-    b = imagePixel.b * 5.55555;
-    a = imagePixel.a * 5.55555;
-
-    //  3) Values, which are now 1.0, are called "middle gray".
-    //     If defog and exposure are both set to 0.0, then
-    //     middle gray corresponds to a raw pixel value of 0.18.
-    //     In step 6, middle gray values will be mapped to an
-    //     intensity 3.5 f-stops below the display's maximum
-    //     intensity.
-    // Response: no apparent content.
-
-    //  4) Apply a knee function.  The knee function has two
-    //     parameters, kneeLow and kneeHigh.  Pixel values
-    //     below 2^kneeLow are not changed by the knee
-    //     function.  Pixel values above kneeLow are lowered
-    //     according to a logarithmic curve, such that the
-    //     value 2^kneeHigh is mapped to 2^3.5 (in step 6,
-    //     this value will be mapped to the display's
-    //     maximum intensity).
-    // Response: kneeLow = 0.0 (2^0.0 => 1); kneeHigh = 5.0 (2^5 =>32)
-    if (r > 1.0) {
-        r = 1.0 + std::log((r - 1.0) * 0.184874 + 1) / 0.184874;
-    }
-    if (g > 1.0) {
-        g = 1.0 + std::log((g - 1.0) * 0.184874 + 1) / 0.184874;
-    }
-    if (b > 1.0) {
-        b = 1.0 + std::log((b - 1.0) * 0.184874 + 1) / 0.184874;
-    }
-    if (a > 1.0) {
-        a = 1.0 + std::log((a - 1.0) * 0.184874 + 1) / 0.184874;
-    }
-    //
-    //  5) Gamma-correct the pixel values, assuming that the
-    //     screen's gamma is 0.4545 (or 1/2.2).
-    r = std::pow(r, 0.4545);
-    g = std::pow(g, 0.4545);
-    b = std::pow(b, 0.4545);
-    a = std::pow(a, 0.4545);
-
-    //  6) Scale the values such that pixels middle gray
-    //     pixels are mapped to 84.66 (or 3.5 f-stops below
-    //     the display's maximum intensity).
-    //
-    //  7) Clamp the values to [0, 255].
-    return qRgba((unsigned char)(Imath::clamp(r * 84.66f, 0.f, 255.f)),
-                 (unsigned char)(Imath::clamp(g * 84.66f, 0.f, 255.f)),
-                 (unsigned char)(Imath::clamp(b * 84.66f, 0.f, 255.f)),
-                 (unsigned char)(Imath::clamp(a * 84.66f, 0.f, 255.f)));
+    x = std::pow(5.5555f * std::max(0.f, x), 0.4545f) * 84.66f;
+    return (unsigned char)qBound(0.f, x, 255.f);
 }
+inline QRgb RgbaToQrgba(struct Imf::Rgba &imagePixel)
+{
+    return qRgba(gamma(float(imagePixel.r)),
+                 gamma(float(imagePixel.g)),
+                 gamma(float(imagePixel.b)),
+                 (unsigned char)(qBound(0.f, imagePixel.a * 255.f, 255.f) + 0.5f));
+}
+#endif
 
 EXRHandler::EXRHandler()
 {
@@ -188,29 +162,98 @@ bool EXRHandler::read(QImage *outImage)
         K_IStream istr(device(), QByteArray());
         Imf::RgbaInputFile file(istr);
         Imath::Box2i dw = file.dataWindow();
+        bool isRgba = file.channels() & Imf::RgbaChannels::WRITE_A;
 
         width = dw.max.x - dw.min.x + 1;
         height = dw.max.y - dw.min.y + 1;
 
-        QImage image = imageAlloc(width, height, QImage::Format_RGB32);
+#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
         if (image.isNull()) {
             qWarning() << "Failed to allocate image, invalid size?" << QSize(width, height);
             return false;
         }
 
-        Imf::Array2D<Imf::Rgba> pixels;
-        pixels.resizeErase(height, width);
-
-        file.setFrameBuffer(&pixels[0][0] - dw.min.x - dw.min.y * width, 1, width);
-        file.readPixels(dw.min.y, dw.max.y);
-
-        // somehow copy pixels into image
-        for (int y = 0; y < height; y++) {
-            for (int x = 0; x < width; x++) {
-                // copy pixels(x,y) into image(x,y)
-                image.setPixel(x, y, RgbaToQrgba(pixels[y][x]));
+        // 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()) {
+#if QT_VERSION >= QT_VERSION_CHECK(6, 5, 0)
+                dateTime.setTimeZone(QTimeZone::fromSecondsAheadOfUtc(off));
+#else
+                dateTime.setOffsetFromUtc(off);
+#endif
+                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);
+
+        // somehow copy pixels into image
+        for (int y = 0; y < height; ++y) {
+            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 defined(EXR_USE_LEGACY_CONVERSIONS)
+                auto scanLine = reinterpret_cast<QRgb *>(image.scanLine(y));
+                for (int x = 0; x < width; ++x) {
+                    *(scanLine + x) = RgbaToQrgba(pixels[x]);
+                }
+#elif defined(EXR_USE_QT6_FLOAT_IMAGE)
+                auto scanLine = reinterpret_cast<qfloat16 *>(image.scanLine(y));
+                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);
+                }
+#else
+                auto scanLine = reinterpret_cast<QRgba64 *>(image.scanLine(y));
+                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));
+                }
+#endif
+            }
+        }
+
+        // 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
 
         *outImage = image;
 

src/imageformats/gimp_p.h

@@ -46,33 +46,6 @@ typedef enum {
 
 // From GIMP "libgimp/gimpenums.h" v2.4
 
-//! Effect to apply when layers are merged together.
-
-typedef enum {
-    NORMAL_MODE,
-    DISSOLVE_MODE,
-    BEHIND_MODE,
-    MULTIPLY_MODE,
-    SCREEN_MODE,
-    OVERLAY_MODE,
-    DIFFERENCE_MODE,
-    ADDITION_MODE,
-    SUBTRACT_MODE,
-    DARKEN_ONLY_MODE,
-    LIGHTEN_ONLY_MODE,
-    HUE_MODE,
-    SATURATION_MODE,
-    COLOR_MODE,
-    VALUE_MODE,
-    DIVIDE_MODE,
-    DODGE_MODE,
-    BURN_MODE,
-    HARDLIGHT_MODE,
-    SOFTLIGHT_MODE,
-    GRAIN_EXTRACT_MODE,
-    GRAIN_MERGE_MODE
-} LayerModeEffects;
-
 // From GIMP "paint_funcs.c" v1.2
 
 /*!

src/imageformats/hdr.cpp

@@ -9,6 +9,7 @@
 #include "hdr_p.h"
 #include "util_p.h"
 
+#include <QColorSpace>
 #include <QDataStream>
 #include <QImage>
 #include <QLoggingCategory>
@@ -28,11 +29,8 @@ namespace // Private.
 
 static inline uchar ClipToByte(float value)
 {
-    if (value > 255.0f) {
-        return 255;
-    }
-    // else if (value < 0.0f) return 0;  // we know value is positive.
-    return uchar(value);
+    // we know value is positive.
+    return uchar(std::min(value + 0.5f, 255.0f));
 }
 
 // read an old style line from the hdr image file
@@ -42,6 +40,7 @@ static bool Read_Old_Line(uchar *image, int width, QDataStream &s)
     int rshift = 0;
     int i;
 
+    uchar *start = image;
     while (width > 0) {
         s >> image[0];
         s >> image[1];
@@ -53,7 +52,14 @@ static bool Read_Old_Line(uchar *image, int width, QDataStream &s)
         }
 
         if ((image[0] == 1) && (image[1] == 1) && (image[2] == 1)) {
-            for (i = image[3] << rshift; i > 0; i--) {
+            // NOTE: we don't have an image sample that cover this code
+            if (rshift > 31) {
+                return false;
+            }
+            for (i = image[3] << rshift; i > 0 && width > 0; i--) {
+                if (image == start) {
+                    return false; // you cannot be here at the first run
+                }
                 // memcpy(image, image-4, 4);
                 (uint &)image[0] = (uint &)image[0 - 4];
                 image += 4;
@@ -74,7 +80,7 @@ static void RGBE_To_QRgbLine(uchar *image, QRgb *scanline, int width)
     for (int j = 0; j < width; j++) {
         // v = ldexp(1.0, int(image[3]) - 128);
         float v;
-        int e = int(image[3]) - 128;
+        int e = qBound(-31, int(image[3]) - 128, 31);
         if (e > 0) {
             v = float(1 << e);
         } else {
@@ -148,7 +154,7 @@ static bool LoadHDR(QDataStream &s, const int width, const int height, QImage &i
         }
 
         // read each component
-        for (int i = 0; i < 4; i++) {
+        for (int i = 0, len = int(lineArray.size()); i < 4; i++) {
             for (int j = 0; j < width;) {
                 s >> code;
                 if (s.atEnd()) {
@@ -160,14 +166,20 @@ static bool LoadHDR(QDataStream &s, const int width, const int height, QImage &i
                     code &= 127;
                     s >> val;
                     while (code != 0) {
-                        image[i + j * 4] = val;
+                        auto idx = i + j * 4;
+                        if (idx < len) {
+                            image[idx] = val;
+                        }
                         j++;
                         code--;
                     }
                 } else {
                     // non-run
                     while (code != 0) {
-                        s >> image[i + j * 4];
+                        auto idx = i + j * 4;
+                        if (idx < len) {
+                            s >> image[idx];
+                        }
                         j++;
                         code--;
                     }
@@ -242,6 +254,9 @@ bool HDRHandler::read(QImage *outImage)
         // qDebug() << "Error loading HDR file.";
         return false;
     }
+    // The images read by Gimp and Photoshop (including those of the tests) are interpreted with linear color space.
+    // By setting the linear color space, programs that support profiles display HDR files as in GIMP and Photoshop.
+    img.setColorSpace(QColorSpace(QColorSpace::SRgbLinear));
 
     *outImage = img;
     return true;

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/qoi.cpp

@@ -0,0 +1,475 @@
+/*
+    This file is part of the KDE project
+    SPDX-FileCopyrightText: 2023 Ernest Gupik <ernestgupik@wp.pl>
+    SPDX-FileCopyrightText: 2023 Mirco Miranda <mircomir@outlook.com>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
+
+#include "qoi_p.h"
+#include "scanlineconverter_p.h"
+#include "util_p.h"
+
+#include <QColorSpace>
+#include <QFile>
+#include <QIODevice>
+#include <QImage>
+
+namespace // Private
+{
+
+#define QOI_OP_INDEX 0x00 /* 00xxxxxx */
+#define QOI_OP_DIFF 0x40 /* 01xxxxxx */
+#define QOI_OP_LUMA 0x80 /* 10xxxxxx */
+#define QOI_OP_RUN 0xc0 /* 11xxxxxx */
+#define QOI_OP_RGB 0xfe /* 11111110 */
+#define QOI_OP_RGBA 0xff /* 11111111 */
+#define QOI_MASK_2 0xc0 /* 11000000 */
+
+#define QOI_MAGIC (((unsigned int)'q') << 24 | ((unsigned int)'o') << 16 | ((unsigned int)'i') << 8 | ((unsigned int)'f'))
+#define QOI_HEADER_SIZE 14
+#define QOI_END_STREAM_PAD 8
+
+struct QoiHeader {
+    quint32 MagicNumber;
+    quint32 Width;
+    quint32 Height;
+    quint8 Channels;
+    quint8 Colorspace;
+};
+
+struct Px {
+    bool operator==(const Px &other) const
+    {
+        return r == other.r && g == other.g && b == other.b && a == other.a;
+    }
+    quint8 r;
+    quint8 g;
+    quint8 b;
+    quint8 a;
+};
+
+static QDataStream &operator>>(QDataStream &s, QoiHeader &head)
+{
+    s >> head.MagicNumber;
+    s >> head.Width;
+    s >> head.Height;
+    s >> head.Channels;
+    s >> head.Colorspace;
+    return s;
+}
+
+static QDataStream &operator<<(QDataStream &s, const QoiHeader &head)
+{
+    s << head.MagicNumber;
+    s << head.Width;
+    s << head.Height;
+    s << head.Channels;
+    s << head.Colorspace;
+    return s;
+}
+
+static bool IsSupported(const QoiHeader &head)
+{
+    // Check magic number
+    if (head.MagicNumber != QOI_MAGIC) {
+        return false;
+    }
+    // Check if the header is a valid QOI header
+    if (head.Width == 0 || head.Height == 0 || head.Channels < 3 || head.Colorspace > 1) {
+        return false;
+    }
+    // Set a reasonable upper limit
+    if (head.Width > 300000 || head.Height > 300000) {
+        return false;
+    }
+    return true;
+}
+
+static int QoiHash(const Px &px)
+{
+    return px.r * 3 + px.g * 5 + px.b * 7 + px.a * 11;
+}
+
+static QImage::Format imageFormat(const QoiHeader &head)
+{
+    if (IsSupported(head)) {
+        return (head.Channels == 3 ? QImage::Format_RGB32 : QImage::Format_ARGB32);
+    }
+    return QImage::Format_Invalid;
+}
+
+static bool LoadQOI(QIODevice *device, const QoiHeader &qoi, QImage &img)
+{
+    Px index[64] = {Px{0, 0, 0, 0}};
+    Px px = Px{0, 0, 0, 255};
+
+    // The px_len should be enough to read a complete "compressed" row: an uncompressible row can become
+    // larger than the row itself. It should never be more than 1/3 (RGB) or 1/4 (RGBA) the length of the
+    // row itself (see test bnm_rgb*.qoi) so I set the extra data to 1/2.
+    // The minimum value is to ensure that enough bytes are read when the image is very small (e.g. 1x1px):
+    // it can be set as large as you like.
+    quint64 px_len = std::max(quint64(1024), quint64(qoi.Width) * qoi.Channels * 3 / 2);
+    if (px_len > kMaxQVectorSize) {
+        return false;
+    }
+
+    // Allocate image
+    img = imageAlloc(qoi.Width, qoi.Height, imageFormat(qoi));
+    if (img.isNull()) {
+        return false;
+    }
+
+    // Set the image colorspace based on the qoi.Colorspace value
+    // As per specification: 0 = sRGB with linear alpha, 1 = all channels linear
+    if (qoi.Colorspace) {
+        img.setColorSpace(QColorSpace(QColorSpace::SRgbLinear));
+    } else {
+        img.setColorSpace(QColorSpace(QColorSpace::SRgb));
+    }
+
+    // Handle the byte stream
+    QByteArray ba;
+    for (quint32 y = 0, run = 0; y < qoi.Height; ++y) {
+        if (quint64(ba.size()) < px_len) {
+            ba.append(device->read(px_len));
+        }
+
+        if (ba.size() < QOI_END_STREAM_PAD) {
+            return false;
+        }
+
+        quint64 chunks_len = ba.size() - QOI_END_STREAM_PAD;
+        quint64 p = 0;
+        QRgb *scanline = reinterpret_cast<QRgb *>(img.scanLine(y));
+        const quint8 *input = reinterpret_cast<const quint8 *>(ba.constData());
+        for (quint32 x = 0; x < qoi.Width; ++x) {
+            if (run > 0) {
+                run--;
+            } else if (p < chunks_len) {
+                quint32 b1 = input[p++];
+
+                if (b1 == QOI_OP_RGB) {
+                    px.r = input[p++];
+                    px.g = input[p++];
+                    px.b = input[p++];
+                } else if (b1 == QOI_OP_RGBA) {
+                    px.r = input[p++];
+                    px.g = input[p++];
+                    px.b = input[p++];
+                    px.a = input[p++];
+                } else if ((b1 & QOI_MASK_2) == QOI_OP_INDEX) {
+                    px = index[b1];
+                } else if ((b1 & QOI_MASK_2) == QOI_OP_DIFF) {
+                    px.r += ((b1 >> 4) & 0x03) - 2;
+                    px.g += ((b1 >> 2) & 0x03) - 2;
+                    px.b += (b1 & 0x03) - 2;
+                } else if ((b1 & QOI_MASK_2) == QOI_OP_LUMA) {
+                    quint32 b2 = input[p++];
+                    quint32 vg = (b1 & 0x3f) - 32;
+                    px.r += vg - 8 + ((b2 >> 4) & 0x0f);
+                    px.g += vg;
+                    px.b += vg - 8 + (b2 & 0x0f);
+                } else if ((b1 & QOI_MASK_2) == QOI_OP_RUN) {
+                    run = (b1 & 0x3f);
+                }
+                index[QoiHash(px) & 0x3F] = px;
+            }
+            // Set the values for the pixel at (x, y)
+            scanline[x] = qRgba(px.r, px.g, px.b, px.a);
+        }
+
+        if (p) {
+            ba.remove(0, p);
+        }
+    }
+
+    // From specs the byte stream's end is marked with 7 0x00 bytes followed by a single 0x01 byte.
+    // NOTE: Instead of using "ba == QByteArray::fromRawData("\x00\x00\x00\x00\x00\x00\x00\x01", 8)"
+    //       we preferred a generic check that allows data to exist after the end of the file.
+    return (ba.startsWith(QByteArray::fromRawData("\x00\x00\x00\x00\x00\x00\x00\x01", 8)));
+}
+
+static bool SaveQOI(QIODevice *device, const QoiHeader &qoi, const QImage &img)
+{
+    Px index[64] = {Px{0, 0, 0, 0}};
+    Px px = Px{0, 0, 0, 255};
+    Px px_prev = px;
+
+    auto run = 0;
+    auto channels = qoi.Channels;
+
+    QByteArray ba;
+    ba.reserve(img.width() * channels * 3 / 2);
+
+    ScanLineConverter converter(channels == 3 ? QImage::Format_RGB888 : QImage::Format_RGBA8888);
+    converter.setTargetColorSpace(QColorSpace(qoi.Colorspace == 1 ? QColorSpace::SRgbLinear : QColorSpace::SRgb));
+
+    for (auto h = img.height(), y = 0; y < h; ++y) {
+        auto pixels = converter.convertedScanLine(img, y);
+        if (pixels == nullptr) {
+            return false;
+        }
+
+        for (auto w = img.width() * channels, px_pos = 0; px_pos < w; px_pos += channels) {
+            px.r = pixels[px_pos + 0];
+            px.g = pixels[px_pos + 1];
+            px.b = pixels[px_pos + 2];
+
+            if (channels == 4) {
+                px.a = pixels[px_pos + 3];
+            }
+
+            if (px == px_prev) {
+                run++;
+                if (run == 62 || (px_pos == w - channels && y == h - 1)) {
+                    ba.append(QOI_OP_RUN | (run - 1));
+                    run = 0;
+                }
+            } else {
+                int index_pos;
+
+                if (run > 0) {
+                    ba.append(QOI_OP_RUN | (run - 1));
+                    run = 0;
+                }
+
+                index_pos = QoiHash(px) & 0x3F;
+
+                if (index[index_pos] == px) {
+                    ba.append(QOI_OP_INDEX | index_pos);
+                } else {
+                    index[index_pos] = px;
+
+                    if (px.a == px_prev.a) {
+                        signed char vr = px.r - px_prev.r;
+                        signed char vg = px.g - px_prev.g;
+                        signed char vb = px.b - px_prev.b;
+
+                        signed char vg_r = vr - vg;
+                        signed char vg_b = vb - vg;
+
+                        if (vr > -3 && vr < 2 && vg > -3 && vg < 2 && vb > -3 && vb < 2) {
+                            ba.append(QOI_OP_DIFF | (vr + 2) << 4 | (vg + 2) << 2 | (vb + 2));
+                        } else if (vg_r > -9 && vg_r < 8 && vg > -33 && vg < 32 && vg_b > -9 && vg_b < 8) {
+                            ba.append(QOI_OP_LUMA | (vg + 32));
+                            ba.append((vg_r + 8) << 4 | (vg_b + 8));
+                        } else {
+                            ba.append(char(QOI_OP_RGB));
+                            ba.append(px.r);
+                            ba.append(px.g);
+                            ba.append(px.b);
+                        }
+                    } else {
+                        ba.append(char(QOI_OP_RGBA));
+                        ba.append(px.r);
+                        ba.append(px.g);
+                        ba.append(px.b);
+                        ba.append(px.a);
+                    }
+                }
+            }
+            px_prev = px;
+        }
+
+        auto written = device->write(ba);
+        if (written < 0) {
+            return false;
+        }
+        if (written) {
+            ba.remove(0, written);
+        }
+    }
+
+    // QOI end of stream
+    ba.append(QByteArray::fromRawData("\x00\x00\x00\x00\x00\x00\x00\x01", 8));
+
+    // write remaining data
+    for (qint64 w = 0, write = 0, size = ba.size(); write < size; write += w) {
+        w = device->write(ba.constData() + write, size - write);
+        if (w < 0) {
+            return false;
+        }
+    }
+
+    return true;
+}
+
+} // namespace
+
+QOIHandler::QOIHandler()
+{
+}
+
+bool QOIHandler::canRead() const
+{
+    if (canRead(device())) {
+        setFormat("qoi");
+        return true;
+    }
+    return false;
+}
+
+bool QOIHandler::canRead(QIODevice *device)
+{
+    if (!device) {
+        qWarning("QOIHandler::canRead() called with no device");
+        return false;
+    }
+
+    device->startTransaction();
+    QByteArray head = device->read(QOI_HEADER_SIZE);
+    qsizetype readBytes = head.size();
+    device->rollbackTransaction();
+
+    if (readBytes < QOI_HEADER_SIZE) {
+        return false;
+    }
+
+    QDataStream stream(head);
+    stream.setByteOrder(QDataStream::BigEndian);
+    QoiHeader qoi = {0, 0, 0, 0, 2};
+    stream >> qoi;
+
+    return IsSupported(qoi);
+}
+
+bool QOIHandler::read(QImage *image)
+{
+    QDataStream s(device());
+    s.setByteOrder(QDataStream::BigEndian);
+
+    // Read image header
+    QoiHeader qoi = {0, 0, 0, 0, 2};
+    s >> qoi;
+
+    // Check if file is supported
+    if (!IsSupported(qoi)) {
+        return false;
+    }
+
+    QImage img;
+    bool result = LoadQOI(s.device(), qoi, img);
+
+    if (result == false) {
+        return false;
+    }
+
+    *image = img;
+    return true;
+}
+
+bool QOIHandler::write(const QImage &image)
+{
+    if (image.isNull()) {
+        return false;
+    }
+
+    QoiHeader qoi;
+    qoi.MagicNumber = QOI_MAGIC;
+    qoi.Width = image.width();
+    qoi.Height = image.height();
+    qoi.Channels = image.hasAlphaChannel() ? 4 : 3;
+    qoi.Colorspace = image.colorSpace().transferFunction() == QColorSpace::TransferFunction::Linear ? 1 : 0;
+
+    if (!IsSupported(qoi)) {
+        return false;
+    }
+
+    QDataStream s(device());
+    s.setByteOrder(QDataStream::BigEndian);
+    s << qoi;
+    if (s.status() != QDataStream::Ok) {
+        return false;
+    }
+
+    return SaveQOI(s.device(), qoi, image);
+}
+
+bool QOIHandler::supportsOption(ImageOption option) const
+{
+    if (option == QImageIOHandler::Size) {
+        return true;
+    }
+    if (option == QImageIOHandler::ImageFormat) {
+        return true;
+    }
+    return false;
+}
+
+QVariant QOIHandler::option(ImageOption option) const
+{
+    QVariant v;
+
+    if (option == QImageIOHandler::Size) {
+        if (auto d = device()) {
+            // transactions works on both random and sequential devices
+            d->startTransaction();
+            auto ba = d->read(sizeof(QoiHeader));
+            d->rollbackTransaction();
+
+            QDataStream s(ba);
+            s.setByteOrder(QDataStream::BigEndian);
+
+            QoiHeader header = {0, 0, 0, 0, 2};
+            s >> header;
+
+            if (s.status() == QDataStream::Ok && IsSupported(header)) {
+                v = QVariant::fromValue(QSize(header.Width, header.Height));
+            }
+        }
+    }
+
+    if (option == QImageIOHandler::ImageFormat) {
+        if (auto d = device()) {
+            // transactions works on both random and sequential devices
+            d->startTransaction();
+            auto ba = d->read(sizeof(QoiHeader));
+            d->rollbackTransaction();
+
+            QDataStream s(ba);
+            s.setByteOrder(QDataStream::BigEndian);
+
+            QoiHeader header = {0, 0, 0, 0, 2};
+            s >> header;
+
+            if (s.status() == QDataStream::Ok && IsSupported(header)) {
+                v = QVariant::fromValue(imageFormat(header));
+            }
+        }
+    }
+
+    return v;
+}
+
+QImageIOPlugin::Capabilities QOIPlugin::capabilities(QIODevice *device, const QByteArray &format) const
+{
+    if (format == "qoi" || format == "QOI") {
+        return Capabilities(CanRead | CanWrite);
+    }
+    if (!format.isEmpty()) {
+        return {};
+    }
+    if (!device->isOpen()) {
+        return {};
+    }
+
+    Capabilities cap;
+    if (device->isReadable() && QOIHandler::canRead(device)) {
+        cap |= CanRead;
+    }
+    if (device->isWritable()) {
+        cap |= CanWrite;
+    }
+    return cap;
+}
+
+QImageIOHandler *QOIPlugin::create(QIODevice *device, const QByteArray &format) const
+{
+    QImageIOHandler *handler = new QOIHandler;
+    handler->setDevice(device);
+    handler->setFormat(format);
+    return handler;
+}
+
+#include "moc_qoi_p.cpp"

src/imageformats/qoi.desktop

@@ -0,0 +1,7 @@
+[Desktop Entry]
+Type=Service
+X-KDE-ServiceTypes=QImageIOPlugins
+X-KDE-ImageFormat=qoi
+X-KDE-MimeType=image/qoi
+X-KDE-Read=true
+X-KDE-Write=true

src/imageformats/qoi.json

@@ -0,0 +1,4 @@
+{
+    "Keys": [ "qoi" ],
+    "MimeTypes": [ "image/qoi" ]
+}

src/imageformats/qoi_p.h

@@ -0,0 +1,38 @@
+/*
+    This file is part of the KDE project
+    SPDX-FileCopyrightText: 2023 Ernest Gupik <ernestgupik@wp.pl>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
+
+#ifndef KIMG_QOI_P_H
+#define KIMG_QOI_P_H
+
+#include <QImageIOPlugin>
+
+class QOIHandler : public QImageIOHandler
+{
+public:
+    QOIHandler();
+
+    bool canRead() const override;
+    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);
+};
+
+class QOIPlugin : public QImageIOPlugin
+{
+    Q_OBJECT
+    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QImageIOHandlerFactoryInterface" FILE "qoi.json")
+
+public:
+    Capabilities capabilities(QIODevice *device, const QByteArray &format) const override;
+    QImageIOHandler *create(QIODevice *device, const QByteArray &format = QByteArray()) const override;
+};
+
+#endif // KIMG_QOI_P_H

src/imageformats/raw.cpp

@@ -443,7 +443,9 @@ 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
 
@@ -723,6 +725,7 @@ RAWHandler::RAWHandler()
     : m_imageNumber(0)
     , m_imageCount(0)
     , m_quality(-1)
+    , m_startPos(-1)
 {
 }
 
@@ -739,6 +742,15 @@ 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;
@@ -820,7 +832,7 @@ 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

@@ -78,6 +78,12 @@ private:
      * @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;
+
+    /*!
+     * \brief m_startPos
+     * The initial device position to allow multi image load (cache value).
+     */
+    qint64 m_startPos;
 };
 
 class RAWPlugin : public QImageIOPlugin

src/imageformats/scanlineconverter.cpp

@@ -0,0 +1,101 @@
+/*
+    SPDX-FileCopyrightText: 2023 Mirco Miranda <mircomir@outlook.com>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
+
+#include "scanlineconverter_p.h"
+#include <cstring>
+
+ScanLineConverter::ScanLineConverter(const QImage::Format &targetFormat)
+    : _targetFormat(targetFormat)
+{
+}
+
+ScanLineConverter::ScanLineConverter(const ScanLineConverter &other)
+    : _targetFormat(other._targetFormat)
+    , _colorSpace(other._colorSpace)
+{
+}
+
+ScanLineConverter &ScanLineConverter::operator=(const ScanLineConverter &other)
+{
+    this->_targetFormat = other._targetFormat;
+    this->_colorSpace = other._colorSpace;
+    return (*this);
+}
+
+QImage::Format ScanLineConverter::targetFormat() const
+{
+    return _targetFormat;
+}
+
+void ScanLineConverter::setTargetColorSpace(const QColorSpace &colorSpace)
+{
+    _colorSpace = colorSpace;
+}
+
+QColorSpace ScanLineConverter::targetColorSpace() const
+{
+    return _colorSpace;
+}
+
+const uchar *ScanLineConverter::convertedScanLine(const QImage &image, qint32 y)
+{
+    auto colorSpaceConversion = isColorSpaceConversionNeeded(image, _colorSpace);
+    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());
+    }
+    if (_tmpBuffer.isNull()) {
+        return nullptr;
+    }
+    std::memcpy(_tmpBuffer.bits(), image.constScanLine(y), std::min(_tmpBuffer.bytesPerLine(), image.bytesPerLine()));
+    if (colorSpaceConversion) {
+        _tmpBuffer.setColorSpace(image.colorSpace());
+        _tmpBuffer.convertToColorSpace(_colorSpace);
+    }
+    _convBuffer = _tmpBuffer.convertToFormat(_targetFormat);
+    if (_convBuffer.isNull()) {
+        return nullptr;
+    }
+    return _convBuffer.constBits();
+}
+
+qsizetype ScanLineConverter::bytesPerLine() const
+{
+    if (_convBuffer.isNull()) {
+        return 0;
+    }
+    return _convBuffer.bytesPerLine();
+}
+
+bool ScanLineConverter::isColorSpaceConversionNeeded(const QImage &image, const QColorSpace &targetColorSpace) const
+{
+    if (image.depth() < 24) { // RGB 8 bit or grater only
+        return false;
+    }
+    auto sourceColorSpace = image.colorSpace();
+    if (!sourceColorSpace.isValid() || !targetColorSpace.isValid()) {
+        return false;
+    }
+
+    auto stf = sourceColorSpace.transferFunction();
+    auto spr = sourceColorSpace.primaries();
+    auto ttf = targetColorSpace.transferFunction();
+    auto tpr = targetColorSpace.primaries();
+    // clang-format off
+    if (stf == QColorSpace::TransferFunction::Custom ||
+        ttf == QColorSpace::TransferFunction::Custom ||
+        spr == QColorSpace::Primaries::Custom ||
+        tpr == QColorSpace::Primaries::Custom) {
+        return true;
+    }
+    // clang-format on
+    if (stf == ttf && spr == tpr) {
+        return false;
+    }
+    return true;
+}

src/imageformats/scanlineconverter_p.h

@@ -0,0 +1,79 @@
+/*
+    SPDX-FileCopyrightText: 2023 Mirco Miranda <mircomir@outlook.com>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
+
+#ifndef SCANLINECONVERTER_P_H
+#define SCANLINECONVERTER_P_H
+
+#include <QColorSpace>
+#include <QImage>
+
+/*!
+ * \brief The scanlineFormatConversion class
+ * A class to convert an image scan line. It introduces some overhead on small images
+ * but performs better on large images. :)
+ */
+class ScanLineConverter
+{
+public:
+    ScanLineConverter(const QImage::Format &targetFormat);
+    ScanLineConverter(const ScanLineConverter &other);
+    ScanLineConverter &operator=(const ScanLineConverter &other);
+
+    /*!
+     * \brief targetFormat
+     * \return The target format set in the constructor.
+     */
+    QImage::Format targetFormat() const;
+
+    /*!
+     * \brief setTargetColorSpace
+     * Set the colorspace conversion.
+     *
+     * In addition to format conversion, it is also possible to convert the color
+     * space if the source image has a different one set.
+     * The conversion is done on the source format if and only if the image
+     * has a color depth greater than 24 bit and the color profile set is different
+     * from that of the image itself.
+     * \param colorSpace
+     */
+    void setTargetColorSpace(const QColorSpace &colorSpace);
+    QColorSpace targetColorSpace() const;
+
+    /*!
+     * \brief convertedScanLine
+     * Convert the scanline \a y.
+     * \note If the image format (and color space) is the same of converted format, it returns the image scan line.
+     * \return The scan line converted.
+     */
+    const uchar *convertedScanLine(const QImage &image, qint32 y);
+
+    /*!
+     * \brief bytesPerLine
+     * \return The size of the last converted scanline.
+     */
+    qsizetype bytesPerLine() const;
+
+    /*!
+     * \brief isColorSpaceConversionNeeded
+     * Calculates if a color space conversion is needed.
+     * \note Only 24 bit or grater images.
+     * \param image The source image.
+     * \param targetColorSpace The target color space.
+     * \return True if the conversion should be done otherwise false.
+     */
+    bool isColorSpaceConversionNeeded(const QImage &image, const QColorSpace &targetColorSpace) const;
+
+private:
+    // data
+    QImage::Format _targetFormat;
+    QColorSpace _colorSpace;
+
+    // internal buffers
+    QImage _tmpBuffer;
+    QImage _convBuffer;
+};
+
+#endif // SCANLINECONVERTER_P_H