jxl: Disable color conversion for animations

Partial backport from master

.gitlab-ci.yml

@@ -2,9 +2,10 @@
 # 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/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 5.113.0  NO_MODULE)
+find_package(ECM 5.116.0  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)
 

autotests/CMakeLists.txt

@@ -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)

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)
@@ -519,9 +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
@@ -567,13 +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) {
@@ -584,7 +619,15 @@ bool QAVIFHandler::write(const QImage &image)
         QImage tmpgrayimage = image.convertToFormat(tmpformat);
 
         avif = avifImageCreate(tmpgrayimage.width(), tmpgrayimage.height(), save_depth, AVIF_PIXEL_FORMAT_YUV400);
+#if AVIF_VERSION >= 110000
+        res = avifImageAllocatePlanes(avif, AVIF_PLANES_YUV);
+        if (res != AVIF_RESULT_OK) {
+            qWarning("ERROR in avifImageAllocatePlanes: %s", avifResultToString(res));
+            return false;
+        }
+#else
         avifImageAllocatePlanes(avif, AVIF_PLANES_YUV);
+#endif
 
         if (tmpgrayimage.colorSpace().isValid()) {
             avif->colorPrimaries = (avifColorPrimaries)1;
@@ -646,8 +689,8 @@ 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
@@ -771,7 +814,15 @@ bool QAVIFHandler::write(const QImage &image)
         avif->transferCharacteristics = transfer_to_save;
 
         if (iccprofile.size() > 0) {
+#if AVIF_VERSION >= 1000000
+            res = avifImageSetProfileICC(avif, reinterpret_cast<const uint8_t *>(iccprofile.constData()), iccprofile.size());
+            if (res != AVIF_RESULT_OK) {
+                qWarning("ERROR in avifImageSetProfileICC: %s", avifResultToString(res));
+                return false;
+            }
+#else
             avifImageSetProfileICC(avif, reinterpret_cast<const uint8_t *>(iccprofile.constData()), iccprofile.size());
+#endif
         }
 
         avifRGBImage rgb;
@@ -807,6 +858,8 @@ 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;
 
@@ -814,6 +867,17 @@ 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;
 
@@ -870,7 +934,7 @@ 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:
@@ -923,6 +987,8 @@ bool QAVIFHandler::jumpToNextImage()
         return false;
     }
 
+    avifResult decodeResult;
+
     if (m_decoder->imageIndex >= 0) {
         if (m_decoder->imageCount < 2) {
             m_parseState = ParseAvifSuccess;
@@ -930,11 +996,16 @@ bool QAVIFHandler::jumpToNextImage()
         }
 
         if (m_decoder->imageIndex >= m_decoder->imageCount - 1) { // start from beginning
-            avifDecoderReset(m_decoder);
+            decodeResult = avifDecoderReset(m_decoder);
+            if (decodeResult != AVIF_RESULT_OK) {
+                qWarning("ERROR in avifDecoderReset: %s", avifResultToString(decodeResult));
+                m_parseState = ParseAvifError;
+                return false;
+            }
         }
     }
 
-    avifResult decodeResult = avifDecoderNextImage(m_decoder);
+    decodeResult = avifDecoderNextImage(m_decoder);
 
     if (decodeResult != AVIF_RESULT_OK) {
         qWarning("ERROR: Failed to decode Next image in sequence: %s", avifResultToString(decodeResult));

src/imageformats/exr.cpp

@@ -68,8 +68,8 @@
 class K_IStream : public Imf::IStream
 {
 public:
-    K_IStream(QIODevice *dev, const QByteArray &fileName)
-        : IStream(fileName.data())
+    K_IStream(QIODevice *dev)
+        : IStream("K_IStream")
         , m_dev(dev)
     {
     }
@@ -159,7 +159,7 @@ bool EXRHandler::read(QImage *outImage)
         int width;
         int height;
 
-        K_IStream istr(device(), QByteArray());
+        K_IStream istr(device());
         Imf::RgbaInputFile file(istr);
         Imath::Box2i dw = file.dataWindow();
         bool isRgba = file.channels() & Imf::RgbaChannels::WRITE_A;
@@ -271,6 +271,13 @@ bool EXRHandler::canRead(QIODevice *device)
         return false;
     }
 
+#if OPENEXR_VERSION_MAJOR == 3 && OPENEXR_VERSION_MINOR > 2
+    // openexpr >= 3.3 uses seek and tell extensively
+    if (device->isSequential()) {
+        return false;
+    }
+#endif
+
     const QByteArray head = device->peek(4);
 
     return Imf::isImfMagic(head.data());

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;
     }
@@ -457,8 +476,17 @@ bool HEIFHandler::ensureDecoder()
         return false;
     }
 
-    const bool hasAlphaChannel = heif_image_handle_has_alpha_channel(handle);
     const int bit_depth = heif_image_handle_get_luma_bits_per_pixel(handle);
+
+    if (bit_depth < 8) {
+        m_parseState = ParseHeicError;
+        heif_image_handle_release(handle);
+        heif_context_free(ctx);
+        qWarning() << "HEIF image with undefined or unsupported bit depth.";
+        return false;
+    }
+
+    const bool hasAlphaChannel = heif_image_handle_has_alpha_channel(handle);
     heif_chroma chroma;
 
     QImage::Format target_image_format;
@@ -483,11 +511,7 @@ bool HEIFHandler::ensureDecoder()
         m_parseState = ParseHeicError;
         heif_image_handle_release(handle);
         heif_context_free(ctx);
-        if (bit_depth > 0) {
-            qWarning() << "Unsupported bit depth:" << bit_depth;
-        } else {
-            qWarning() << "Undefined bit depth.";
-        }
+        qWarning() << "Unsupported bit depth:" << bit_depth;
         return false;
     }
 
@@ -500,6 +524,16 @@ bool HEIFHandler::ensureDecoder()
     struct heif_image *img = nullptr;
     err = heif_decode_image(handle, &img, heif_colorspace_RGB, chroma, decoder_option);
 
+#if LIBHEIF_HAVE_VERSION(1, 13, 0)
+    if (err.code == heif_error_Invalid_input && err.subcode == heif_suberror_Unknown_NCLX_matrix_coefficients && img == nullptr && buffer.contains("Xiaomi")) {
+        qWarning() << "Non-standard HEIF image with invalid matrix_coefficients, probably made by a Xiaomi device!";
+
+        // second try to decode with strict decoding disabled
+        decoder_option->strict_decoding = 0;
+        err = heif_decode_image(handle, &img, heif_colorspace_RGB, chroma, decoder_option);
+    }
+#endif
+
     if (decoder_option) {
         heif_decoding_options_free(decoder_option);
     }
@@ -814,6 +848,9 @@ 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 +876,9 @@ 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 +893,34 @@ 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 +969,15 @@ 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 +986,16 @@ 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.cpp

@@ -228,7 +228,7 @@ bool QJpegXLHandler::countALLFrames()
     }
 
     JxlColorEncoding color_encoding;
-    if (m_basicinfo.uses_original_profile == JXL_FALSE) {
+    if (m_basicinfo.uses_original_profile == JXL_FALSE && m_basicinfo.have_animation == JXL_FALSE) {
         JxlColorEncodingSetToSRGB(&color_encoding, JXL_FALSE);
         JxlDecoderSetPreferredColorProfile(m_decoder, &color_encoding);
     }
@@ -960,13 +960,7 @@ bool QJpegXLHandler::rewind()
 
     JxlDecoderCloseInput(m_decoder);
 
-    if (m_basicinfo.uses_original_profile) {
-        if (JxlDecoderSubscribeEvents(m_decoder, JXL_DEC_FULL_IMAGE) != JXL_DEC_SUCCESS) {
-            qWarning("ERROR: JxlDecoderSubscribeEvents failed");
-            m_parseState = ParseJpegXLError;
-            return false;
-        }
-    } else {
+    if (m_basicinfo.uses_original_profile == JXL_FALSE && m_basicinfo.have_animation == JXL_FALSE) {
         if (JxlDecoderSubscribeEvents(m_decoder, JXL_DEC_COLOR_ENCODING | JXL_DEC_FULL_IMAGE) != JXL_DEC_SUCCESS) {
             qWarning("ERROR: JxlDecoderSubscribeEvents failed");
             m_parseState = ParseJpegXLError;
@@ -983,6 +977,12 @@ bool QJpegXLHandler::rewind()
         JxlColorEncoding color_encoding;
         JxlColorEncodingSetToSRGB(&color_encoding, JXL_FALSE);
         JxlDecoderSetPreferredColorProfile(m_decoder, &color_encoding);
+    } else {
+        if (JxlDecoderSubscribeEvents(m_decoder, JXL_DEC_FULL_IMAGE) != JXL_DEC_SUCCESS) {
+            qWarning("ERROR: JxlDecoderSubscribeEvents failed");
+            m_parseState = ParseJpegXLError;
+            return false;
+        }
     }
 
     return true;

src/imageformats/pcx.cpp

@@ -308,6 +308,11 @@ static bool readImage4(QImage &img, QDataStream &s, const PCXHEADER &header)
         return false;
     }
 
+    if (header.BytesPerLine < (header.width() + 7) / 8) {
+        qWarning() << "PCX image has invalid BytesPerLine value";
+        return false;
+    }
+
     for (int y = 0; y < header.height(); ++y) {
         if (s.atEnd()) {
             return false;
@@ -418,6 +423,8 @@ static bool readImage24(QImage &img, QDataStream &s, const PCXHEADER &header)
         return false;
     }
 
+    const unsigned int bpl = std::min(header.BytesPerLine, static_cast<quint16>(header.width()));
+
     for (int y = 0; y < header.height(); ++y) {
         if (s.atEnd()) {
             return false;
@@ -434,7 +441,8 @@ static bool readImage24(QImage &img, QDataStream &s, const PCXHEADER &header)
         }
 
         uint *p = (uint *)img.scanLine(y);
-        for (int x = 0; x < header.width(); ++x) {
+
+        for (unsigned int x = 0; x < bpl; ++x) {
             p[x] = qRgb(r_buf[x], g_buf[x], b_buf[x]);
         }
     }

src/imageformats/raw.cpp

@@ -807,12 +807,10 @@ QVariant RAWHandler::option(ImageOption option) const
         rawProcessor->imgdata.rawparams.shot_select = currentImageNumber();
 #endif
         if (rawProcessor->open_datastream(&stream) == LIBRAW_SUCCESS) {
-            if (rawProcessor->unpack() == LIBRAW_SUCCESS) {
-                auto w = libraw_get_iwidth(&rawProcessor->imgdata);
-                auto h = libraw_get_iheight(&rawProcessor->imgdata);
-                // flip & 4: taken from LibRaw code
-                v = (rawProcessor->imgdata.sizes.flip & 4) ? QSize(h, w) : QSize(w, h);
-            }
+            auto w = libraw_get_iwidth(&rawProcessor->imgdata);
+            auto h = libraw_get_iheight(&rawProcessor->imgdata);
+            // flip & 4: taken from LibRaw code
+            v = (rawProcessor->imgdata.sizes.flip & 4) ? QSize(h, w) : QSize(w, h);
         }
         d->rollbackTransaction();
     }

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/xcf.cpp

@@ -1093,7 +1093,9 @@ bool XCFImageFormat::loadProperty(QDataStream &xcf_io, PropType &type, QByteArra
         size = 0;
     } else {
         xcf_io >> size;
-        if (size > 256000) {
+        if (size > 256000 * 4) {
+            // NOTE: I didn't find any reference to maximum property dimensions in the specs, so I assume it's just a sanity check.
+            qCDebug(XCFPLUGIN) << "XCF: loadProperty skips" << type << "due to size being too large";
             return false;
         }
         data = new char[size];
@@ -1672,8 +1674,12 @@ bool XCFImageFormat::assignImageBytes(Layer &layer, uint i, uint j, const GimpPr
         for (int y = 0; y < height; y++) {
             uchar *dataPtr = bits + y * bytesPerLine;
             uchar *alphaPtr = nullptr;
-            if (!layer.alpha_tiles.isEmpty())
-                alphaPtr = layer.alpha_tiles[j][i].scanLine(y);
+            if (layer.alpha_tiles.size() > j && layer.alpha_tiles.at(j).size() > i) {
+                QImage &alphaTile = layer.alpha_tiles[j][i];
+                if (alphaTile.width() >= width && alphaTile.height() > y) {
+                    alphaPtr = alphaTile.scanLine(y);
+                }
+            }
             if (bpc == 4) {
 #ifdef USE_FLOAT_IMAGES
                 if (precision < GimpPrecision::GIMP_PRECISION_HALF_LINEAR) {
@@ -1970,6 +1976,12 @@ static bool convertFloatTo16Bit(uchar *output, quint64 outputSize, uchar *input)
  */
 bool XCFImageFormat::loadLevel(QDataStream &xcf_io, Layer &layer, qint32 bpp, const GimpPrecision precision)
 {
+    auto bpc = bytesPerChannel(precision);
+    if ((bpc == 0) || (bpp % bpc)) {
+        qCDebug(XCFPLUGIN) << "XCF: the stream seems corrupted";
+        return false;
+    }
+
     qint32 width;
     qint32 height;
 
@@ -2755,10 +2767,10 @@ void XCFImageFormat::copyLayerToImage(XCFImage &xcf_image)
     // For each tile...
 
     for (uint j = 0; j < layer.nrows; j++) {
-        uint y = j * TILE_HEIGHT;
+        qint32 y = qint32(j * TILE_HEIGHT);
 
         for (uint i = 0; i < layer.ncols; i++) {
-            uint x = i * TILE_WIDTH;
+            qint32 x = qint32(i * TILE_WIDTH);
 
             // This seems the best place to apply the dissolve because it
             // depends on the global position of each tile's
@@ -3045,7 +3057,7 @@ void XCFImageFormat::mergeLayerIntoImage(XCFImage &xcf_image)
         merge = mergeRGBToRGB;
         break;
     case GRAY_GIMAGE:
-        if (layer.opacity == OPAQUE_OPACITY) {
+        if (layer.opacity == OPAQUE_OPACITY && xcf_image.image.depth() <= 8) {
             merge = mergeGrayToGray;
         } else {
             merge = mergeGrayToRGB;
@@ -3181,10 +3193,10 @@ void XCFImageFormat::mergeLayerIntoImage(XCFImage &xcf_image)
             qCDebug(XCFPLUGIN) << "Using QPainter for mode" << layer.mode;
 
             for (uint j = 0; j < layer.nrows; j++) {
-                uint y = j * TILE_HEIGHT;
+                qint32 y = qint32(j * TILE_HEIGHT);
 
                 for (uint i = 0; i < layer.ncols; i++) {
-                    uint x = i * TILE_WIDTH;
+                    qint32 x = qint32(i * TILE_WIDTH);
 
                     QImage &tile = layer.image_tiles[j][i];
                     if (x + layer.x_offset < MAX_IMAGE_WIDTH &&
@@ -3210,10 +3222,10 @@ void XCFImageFormat::mergeLayerIntoImage(XCFImage &xcf_image)
 #endif
 
     for (uint j = 0; j < layer.nrows; j++) {
-        uint y = j * TILE_HEIGHT;
+        qint32 y = qint32(j * TILE_HEIGHT);
 
         for (uint i = 0; i < layer.ncols; i++) {
-            uint x = i * TILE_WIDTH;
+            qint32 x = qint32(i * TILE_WIDTH);
 
             // This seems the best place to apply the dissolve because it
             // depends on the global position of each tile's
@@ -3853,6 +3865,9 @@ bool XCFImageFormat::mergeGrayAToRGB(const Layer &layer, uint i, uint j, int k,
     }
 
     switch (layer.mode) {
+    case GIMP_LAYER_MODE_NORMAL:
+    case GIMP_LAYER_MODE_NORMAL_LEGACY:
+        break;
     case GIMP_LAYER_MODE_MULTIPLY:
     case GIMP_LAYER_MODE_MULTIPLY_LEGACY: {
         src = INT_MULT(src, dst);
@@ -4146,7 +4161,9 @@ bool XCFHandler::canRead() const
 bool XCFHandler::read(QImage *image)
 {
     XCFImageFormat xcfif;
-    return xcfif.readXCF(device(), image);
+    auto ok = xcfif.readXCF(device(), image);
+    m_imageSize = image->size();
+    return ok;
 }
 
 bool XCFHandler::write(const QImage &)
@@ -4166,6 +4183,9 @@ QVariant XCFHandler::option(ImageOption option) const
     QVariant v;
 
     if (option == QImageIOHandler::Size) {
+        if (!m_imageSize.isEmpty()) {
+            return m_imageSize;
+        }
         /*
          * The image structure always starts at offset 0 in the XCF file.
          * byte[9]     "gimp xcf " File type identification
@@ -4178,7 +4198,7 @@ QVariant XCFHandler::option(ImageOption option) const
          * uint32      width        Width of canvas
          * uint32      height       Height of canvas
          */
-        if (auto d = device()) {
+        else if (auto d = device()) {
             // transactions works on both random and sequential devices
             d->startTransaction();
             auto ba9 = d->read(9);      // "gimp xcf "

src/imageformats/xcf_p.h

@@ -24,6 +24,13 @@ public:
     QVariant option(QImageIOHandler::ImageOption option) const override;
 
     static bool canRead(QIODevice *device);
+
+private:
+    /*!
+     * \brief m_imageSize
+     * Image size cache used by option()
+     */
+    QSize m_imageSize;
 };
 
 class XCFPlugin : public QImageIOPlugin