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kimageformats/src/imageformats/avif.cpp
Daniel Novomeský da8ed31aec avif: new quality settings 
Prior libavif 1.0, quality was set using two numbers
(minQuantizer and maxQuantizer).
New versions of libavif recommend using
new/single quality parameter instead.
Compression using the new settings is different
compared to the old.
For example, new quality 68 gives similar compression
like old default 52.
2023-12-13 17:40:21 +01:00

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/*
AV1 Image File Format (AVIF) support for QImage.
SPDX-FileCopyrightText: 2020 Daniel Novomesky <dnovomesky@gmail.com>
SPDX-License-Identifier: BSD-2-Clause
*/
#include <QThread>
#include <QtGlobal>
#include <QColorSpace>
#include "avif_p.h"
#include "util_p.h"
#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(KIMG_AVIF_DEFAULT_QUALITY)
, m_container_width(0)
, m_container_height(0)
, m_rawAvifData(AVIF_DATA_EMPTY)
, m_decoder(nullptr)
, m_must_jump_to_next_image(false)
{
}
QAVIFHandler::~QAVIFHandler()
{
if (m_decoder) {
avifDecoderDestroy(m_decoder);
}
}
bool QAVIFHandler::canRead() const
{
if (m_parseState == ParseAvifNotParsed && !canRead(device())) {
return false;
}
if (m_parseState != ParseAvifError) {
setFormat("avif");
if (m_parseState == ParseAvifFinished) {
return false;
}
return true;
}
return false;
}
bool QAVIFHandler::canRead(QIODevice *device)
{
if (!device) {
return false;
}
QByteArray header = device->peek(144);
if (header.size() < 12) {
return false;
}
avifROData input;
input.data = reinterpret_cast<const uint8_t *>(header.constData());
input.size = header.size();
if (avifPeekCompatibleFileType(&input)) {
return true;
}
return false;
}
bool QAVIFHandler::ensureParsed() const
{
if (m_parseState == ParseAvifSuccess || m_parseState == ParseAvifMetadata || m_parseState == ParseAvifFinished) {
return true;
}
if (m_parseState == ParseAvifError) {
return false;
}
QAVIFHandler *that = const_cast<QAVIFHandler *>(this);
return that->ensureDecoder();
}
bool QAVIFHandler::ensureOpened() const
{
if (m_parseState == ParseAvifSuccess || m_parseState == ParseAvifFinished) {
return true;
}
if (m_parseState == ParseAvifError) {
return false;
}
QAVIFHandler *that = const_cast<QAVIFHandler *>(this);
if (ensureParsed()) {
if (m_parseState == ParseAvifMetadata) {
bool success = that->jumpToNextImage();
that->m_parseState = success ? ParseAvifSuccess : ParseAvifError;
return success;
}
}
that->m_parseState = ParseAvifError;
return false;
}
bool QAVIFHandler::ensureDecoder()
{
if (m_decoder) {
return true;
}
m_rawData = device()->readAll();
m_rawAvifData.data = reinterpret_cast<const uint8_t *>(m_rawData.constData());
m_rawAvifData.size = m_rawData.size();
if (avifPeekCompatibleFileType(&m_rawAvifData) == AVIF_FALSE) {
m_parseState = ParseAvifError;
return false;
}
m_decoder = avifDecoderCreate();
m_decoder->ignoreExif = AVIF_TRUE;
m_decoder->ignoreXMP = AVIF_TRUE;
#if AVIF_VERSION >= 80400
m_decoder->maxThreads = qBound(1, QThread::idealThreadCount(), 64);
#endif
#if AVIF_VERSION >= 90100
m_decoder->strictFlags = AVIF_STRICT_DISABLED;
#endif
#if AVIF_VERSION >= 110000
m_decoder->imageDimensionLimit = 65535;
#endif
avifResult decodeResult;
decodeResult = avifDecoderSetIOMemory(m_decoder, m_rawAvifData.data, m_rawAvifData.size);
if (decodeResult != AVIF_RESULT_OK) {
qWarning("ERROR: avifDecoderSetIOMemory failed: %s", avifResultToString(decodeResult));
avifDecoderDestroy(m_decoder);
m_decoder = nullptr;
m_parseState = ParseAvifError;
return false;
}
decodeResult = avifDecoderParse(m_decoder);
if (decodeResult != AVIF_RESULT_OK) {
qWarning("ERROR: Failed to parse input: %s", avifResultToString(decodeResult));
avifDecoderDestroy(m_decoder);
m_decoder = nullptr;
m_parseState = ParseAvifError;
return false;
}
m_container_width = m_decoder->image->width;
m_container_height = m_decoder->image->height;
if ((m_container_width > 65535) || (m_container_height > 65535)) {
qWarning("AVIF image (%dx%d) is too large!", m_container_width, m_container_height);
m_parseState = ParseAvifError;
return false;
}
if ((m_container_width == 0) || (m_container_height == 0)) {
qWarning("Empty image, nothing to decode");
m_parseState = ParseAvifError;
return false;
}
if (m_container_width > ((16384 * 16384) / m_container_height)) {
qWarning("AVIF image (%dx%d) has more than 256 megapixels!", m_container_width, m_container_height);
m_parseState = ParseAvifError;
return false;
}
// calculate final dimensions with crop and rotate operations applied
int new_width = m_container_width;
int new_height = m_container_height;
if (m_decoder->image->transformFlags & AVIF_TRANSFORM_CLAP) {
if ((m_decoder->image->clap.widthD > 0) && (m_decoder->image->clap.heightD > 0) && (m_decoder->image->clap.horizOffD > 0)
&& (m_decoder->image->clap.vertOffD > 0)) {
int crop_width = (int)((double)(m_decoder->image->clap.widthN) / (m_decoder->image->clap.widthD) + 0.5);
if (crop_width < new_width && crop_width > 0) {
new_width = crop_width;
}
int crop_height = (int)((double)(m_decoder->image->clap.heightN) / (m_decoder->image->clap.heightD) + 0.5);
if (crop_height < new_height && crop_height > 0) {
new_height = crop_height;
}
}
}
if (m_decoder->image->transformFlags & AVIF_TRANSFORM_IROT) {
if (m_decoder->image->irot.angle == 1 || m_decoder->image->irot.angle == 3) {
int tmp = new_width;
new_width = new_height;
new_height = tmp;
}
}
m_estimated_dimensions.setWidth(new_width);
m_estimated_dimensions.setHeight(new_height);
m_parseState = ParseAvifMetadata;
return true;
}
bool QAVIFHandler::decode_one_frame()
{
if (!ensureParsed()) {
return false;
}
bool loadalpha;
if (m_decoder->image->alphaPlane) {
loadalpha = true;
} else {
loadalpha = false;
}
QImage::Format resultformat;
if (m_decoder->image->depth > 8) {
if (loadalpha) {
resultformat = QImage::Format_RGBA64;
} else {
resultformat = QImage::Format_RGBX64;
}
} else {
if (loadalpha) {
resultformat = QImage::Format_ARGB32;
} else {
resultformat = QImage::Format_RGB32;
}
}
QImage result = imageAlloc(m_decoder->image->width, m_decoder->image->height, resultformat);
if (result.isNull()) {
qWarning("Memory cannot be allocated");
return false;
}
QColorSpace colorspace;
if (m_decoder->image->icc.data && (m_decoder->image->icc.size > 0)) {
const QByteArray icc_data(reinterpret_cast<const char *>(m_decoder->image->icc.data), m_decoder->image->icc.size);
colorspace = QColorSpace::fromIccProfile(icc_data);
if (!colorspace.isValid()) {
qWarning("AVIF image has Qt-unsupported or invalid ICC profile!");
}
} else {
float prim[8] = {0.64f, 0.33f, 0.3f, 0.6f, 0.15f, 0.06f, 0.3127f, 0.329f};
// outPrimaries: rX, rY, gX, gY, bX, bY, wX, wY
avifColorPrimariesGetValues(m_decoder->image->colorPrimaries, prim);
const QPointF redPoint(QAVIFHandler::CompatibleChromacity(prim[0], prim[1]));
const QPointF greenPoint(QAVIFHandler::CompatibleChromacity(prim[2], prim[3]));
const QPointF bluePoint(QAVIFHandler::CompatibleChromacity(prim[4], prim[5]));
const QPointF whitePoint(QAVIFHandler::CompatibleChromacity(prim[6], prim[7]));
QColorSpace::TransferFunction q_trc = QColorSpace::TransferFunction::Custom;
float q_trc_gamma = 0.0f;
switch (m_decoder->image->transferCharacteristics) {
/* AVIF_TRANSFER_CHARACTERISTICS_BT470M */
case 4:
q_trc = QColorSpace::TransferFunction::Gamma;
q_trc_gamma = 2.2f;
break;
/* AVIF_TRANSFER_CHARACTERISTICS_BT470BG */
case 5:
q_trc = QColorSpace::TransferFunction::Gamma;
q_trc_gamma = 2.8f;
break;
/* AVIF_TRANSFER_CHARACTERISTICS_LINEAR */
case 8:
q_trc = QColorSpace::TransferFunction::Linear;
break;
/* AVIF_TRANSFER_CHARACTERISTICS_SRGB */
case 0:
case 2: /* AVIF_TRANSFER_CHARACTERISTICS_UNSPECIFIED */
case 13:
q_trc = QColorSpace::TransferFunction::SRgb;
break;
default:
qWarning("CICP colorPrimaries: %d, transferCharacteristics: %d\nThe colorspace is unsupported by this plug-in yet.",
m_decoder->image->colorPrimaries,
m_decoder->image->transferCharacteristics);
q_trc = QColorSpace::TransferFunction::SRgb;
break;
}
if (q_trc != QColorSpace::TransferFunction::Custom) { // we create new colorspace using Qt
switch (m_decoder->image->colorPrimaries) {
/* AVIF_COLOR_PRIMARIES_BT709 */
case 0:
case 1:
case 2: /* AVIF_COLOR_PRIMARIES_UNSPECIFIED */
colorspace = QColorSpace(QColorSpace::Primaries::SRgb, q_trc, q_trc_gamma);
break;
/* AVIF_COLOR_PRIMARIES_SMPTE432 */
case 12:
colorspace = QColorSpace(QColorSpace::Primaries::DciP3D65, q_trc, q_trc_gamma);
break;
default:
colorspace = QColorSpace(whitePoint, redPoint, greenPoint, bluePoint, q_trc, q_trc_gamma);
break;
}
}
if (!colorspace.isValid()) {
qWarning("AVIF plugin created invalid QColorSpace from NCLX/CICP!");
}
}
result.setColorSpace(colorspace);
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;
if (!loadalpha && (m_decoder->image->yuvFormat == AVIF_PIXEL_FORMAT_YUV400)) {
resultformat = QImage::Format_Grayscale16;
}
} else {
rgb.depth = 8;
#if Q_BYTE_ORDER == Q_LITTLE_ENDIAN
rgb.format = AVIF_RGB_FORMAT_BGRA;
#else
rgb.format = AVIF_RGB_FORMAT_ARGB;
#endif
#if AVIF_VERSION >= 80400
if (m_decoder->imageCount > 1) {
/* accelerate animated AVIF */
rgb.chromaUpsampling = AVIF_CHROMA_UPSAMPLING_FASTEST;
}
#endif
if (!loadalpha && (m_decoder->image->yuvFormat == AVIF_PIXEL_FORMAT_YUV400)) {
resultformat = QImage::Format_Grayscale8;
}
}
rgb.rowBytes = result.bytesPerLine();
rgb.pixels = result.bits();
avifResult res = avifImageYUVToRGB(m_decoder->image, &rgb);
if (res != AVIF_RESULT_OK) {
qWarning("ERROR in avifImageYUVToRGB: %s", avifResultToString(res));
return false;
}
if (m_decoder->image->transformFlags & AVIF_TRANSFORM_CLAP) {
if ((m_decoder->image->clap.widthD > 0) && (m_decoder->image->clap.heightD > 0) && (m_decoder->image->clap.horizOffD > 0)
&& (m_decoder->image->clap.vertOffD > 0)) {
int new_width = (int)((double)(m_decoder->image->clap.widthN) / (m_decoder->image->clap.widthD) + 0.5);
if (new_width > result.width()) {
new_width = result.width();
}
int new_height = (int)((double)(m_decoder->image->clap.heightN) / (m_decoder->image->clap.heightD) + 0.5);
if (new_height > result.height()) {
new_height = result.height();
}
if (new_width > 0 && new_height > 0) {
int offx =
((double)((int32_t)m_decoder->image->clap.horizOffN)) / (m_decoder->image->clap.horizOffD) + (result.width() - new_width) / 2.0 + 0.5;
if (offx < 0) {
offx = 0;
} else if (offx > (result.width() - new_width)) {
offx = result.width() - new_width;
}
int offy =
((double)((int32_t)m_decoder->image->clap.vertOffN)) / (m_decoder->image->clap.vertOffD) + (result.height() - new_height) / 2.0 + 0.5;
if (offy < 0) {
offy = 0;
} else if (offy > (result.height() - new_height)) {
offy = result.height() - new_height;
}
result = result.copy(offx, offy, new_width, new_height);
}
}
else { // Zero values, we need to avoid 0 divide.
qWarning("ERROR: Wrong values in avifCleanApertureBox");
}
}
if (m_decoder->image->transformFlags & AVIF_TRANSFORM_IROT) {
QTransform transform;
switch (m_decoder->image->irot.angle) {
case 1:
transform.rotate(-90);
result = result.transformed(transform);
break;
case 2:
transform.rotate(180);
result = result.transformed(transform);
break;
case 3:
transform.rotate(90);
result = result.transformed(transform);
break;
}
}
if (m_decoder->image->transformFlags & AVIF_TRANSFORM_IMIR) {
#if AVIF_VERSION > 90100 && AVIF_VERSION < 1000000
switch (m_decoder->image->imir.mode) {
#else
switch (m_decoder->image->imir.axis) {
#endif
case 0: // top-to-bottom
result = result.mirrored(false, true);
break;
case 1: // left-to-right
result = result.mirrored(true, false);
break;
}
}
if (resultformat == result.format()) {
m_current_image = result;
} else {
m_current_image = result.convertToFormat(resultformat);
}
m_estimated_dimensions = m_current_image.size();
m_must_jump_to_next_image = false;
return true;
}
bool QAVIFHandler::read(QImage *image)
{
if (!ensureOpened()) {
return false;
}
if (m_must_jump_to_next_image) {
jumpToNextImage();
}
*image = m_current_image;
if (imageCount() >= 2) {
m_must_jump_to_next_image = true;
if (m_decoder->imageIndex >= m_decoder->imageCount - 1) {
// all frames in animation have been read
m_parseState = ParseAvifFinished;
}
} else {
// the static image has been read
m_parseState = ParseAvifFinished;
}
return true;
}
bool QAVIFHandler::write(const QImage &image)
{
if (image.format() == QImage::Format_Invalid) {
qWarning("No image data to save!");
return false;
}
if ((image.width() > 0) && (image.height() > 0)) {
if ((image.width() > 65535) || (image.height() > 65535)) {
qWarning("Image (%dx%d) is too large to save!", image.width(), image.height());
return false;
}
if (image.width() > ((16384 * 16384) / image.height())) {
qWarning("Image (%dx%d) will not be saved because it has more than 256 megapixels!", image.width(), image.height());
return false;
}
if ((image.width() > 32768) || (image.height() > 32768)) {
qWarning("Image (%dx%d) has a dimension above 32768 pixels, saved AVIF may not work in other software!", image.width(), image.height());
}
} else {
qWarning("Image has zero dimension!");
return false;
}
const char *encoder_name = avifCodecName(AVIF_CODEC_CHOICE_AUTO, AVIF_CODEC_FLAG_CAN_ENCODE);
if (!encoder_name) {
qWarning("Cannot save AVIF images because libavif was built without AV1 encoders!");
return false;
}
bool lossless = false;
if (m_quality >= 100) {
if (avifCodecName(AVIF_CODEC_CHOICE_AOM, AVIF_CODEC_FLAG_CAN_ENCODE)) {
lossless = true;
} else {
qWarning("You are using %s encoder. It is recommended to enable libAOM encoder in libavif to use lossless compression.", encoder_name);
}
}
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
int save_depth; // 8 or 10bit per channel
QImage::Format tmpformat; // format for temporary image
avifImage *avif = nullptr;
// grayscale detection
switch (image.format()) {
case QImage::Format_Mono:
case QImage::Format_MonoLSB:
case QImage::Format_Grayscale8:
case QImage::Format_Grayscale16:
save_grayscale = true;
break;
case QImage::Format_Indexed8:
save_grayscale = image.isGrayscale();
break;
default:
save_grayscale = false;
break;
}
// depth detection
switch (image.format()) {
case QImage::Format_BGR30:
case QImage::Format_A2BGR30_Premultiplied:
case QImage::Format_RGB30:
case QImage::Format_A2RGB30_Premultiplied:
case QImage::Format_Grayscale16:
case QImage::Format_RGBX64:
case QImage::Format_RGBA64:
case QImage::Format_RGBA64_Premultiplied:
save_depth = 10;
break;
default:
if (image.depth() > 32) {
save_depth = 10;
} else {
save_depth = 8;
}
break;
}
#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) {
tmpformat = QImage::Format_Grayscale16;
} else {
tmpformat = QImage::Format_Grayscale8;
}
QImage tmpgrayimage = image.convertToFormat(tmpformat);
avif = avifImageCreate(tmpgrayimage.width(), tmpgrayimage.height(), save_depth, AVIF_PIXEL_FORMAT_YUV400);
avifImageAllocatePlanes(avif, AVIF_PLANES_YUV);
if (tmpgrayimage.colorSpace().isValid()) {
avif->colorPrimaries = (avifColorPrimaries)1;
avif->matrixCoefficients = (avifMatrixCoefficients)1;
switch (tmpgrayimage.colorSpace().transferFunction()) {
case QColorSpace::TransferFunction::Linear:
/* AVIF_TRANSFER_CHARACTERISTICS_LINEAR */
avif->transferCharacteristics = (avifTransferCharacteristics)8;
break;
case QColorSpace::TransferFunction::SRgb:
/* AVIF_TRANSFER_CHARACTERISTICS_SRGB */
avif->transferCharacteristics = (avifTransferCharacteristics)13;
break;
default:
/* AVIF_TRANSFER_CHARACTERISTICS_UNSPECIFIED */
break;
}
}
if (save_depth > 8) { // QImage::Format_Grayscale16
for (int y = 0; y < tmpgrayimage.height(); y++) {
const uint16_t *src16bit = reinterpret_cast<const uint16_t *>(tmpgrayimage.constScanLine(y));
uint16_t *dest16bit = reinterpret_cast<uint16_t *>(avif->yuvPlanes[0] + y * avif->yuvRowBytes[0]);
for (int x = 0; x < tmpgrayimage.width(); x++) {
int tmp_pixelval = (int)(((float)(*src16bit) / 65535.0f) * 1023.0f + 0.5f); // downgrade to 10 bits
*dest16bit = qBound(0, tmp_pixelval, 1023);
dest16bit++;
src16bit++;
}
}
} else { // QImage::Format_Grayscale8
for (int y = 0; y < tmpgrayimage.height(); y++) {
const uchar *src8bit = tmpgrayimage.constScanLine(y);
uint8_t *dest8bit = avif->yuvPlanes[0] + y * avif->yuvRowBytes[0];
for (int x = 0; x < tmpgrayimage.width(); x++) {
*dest8bit = *src8bit;
dest8bit++;
src8bit++;
}
}
}
} else { // we are going to save color image
if (save_depth > 8) {
if (image.hasAlphaChannel()) {
tmpformat = QImage::Format_RGBA64;
} else {
tmpformat = QImage::Format_RGBX64;
}
} else { // 8bit depth
if (image.hasAlphaChannel()) {
tmpformat = QImage::Format_RGBA8888;
} else {
tmpformat = QImage::Format_RGB888;
}
}
QImage tmpcolorimage = image.convertToFormat(tmpformat);
avifPixelFormat pixel_format = AVIF_PIXEL_FORMAT_YUV420;
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
}
}
avifMatrixCoefficients matrix_to_save = (avifMatrixCoefficients)1; // default for Qt 5.12 and 5.13;
avifColorPrimaries primaries_to_save = (avifColorPrimaries)2;
avifTransferCharacteristics transfer_to_save = (avifTransferCharacteristics)2;
QByteArray iccprofile;
if (tmpcolorimage.colorSpace().isValid()) {
switch (tmpcolorimage.colorSpace().primaries()) {
case QColorSpace::Primaries::SRgb:
/* AVIF_COLOR_PRIMARIES_BT709 */
primaries_to_save = (avifColorPrimaries)1;
/* AVIF_MATRIX_COEFFICIENTS_BT709 */
matrix_to_save = (avifMatrixCoefficients)1;
break;
case QColorSpace::Primaries::DciP3D65:
/* AVIF_NCLX_COLOUR_PRIMARIES_P3, AVIF_NCLX_COLOUR_PRIMARIES_SMPTE432 */
primaries_to_save = (avifColorPrimaries)12;
/* AVIF_MATRIX_COEFFICIENTS_CHROMA_DERIVED_NCL */
matrix_to_save = (avifMatrixCoefficients)12;
break;
default:
/* AVIF_TRANSFER_CHARACTERISTICS_UNSPECIFIED */
primaries_to_save = (avifColorPrimaries)2;
/* AVIF_MATRIX_COEFFICIENTS_UNSPECIFIED */
matrix_to_save = (avifMatrixCoefficients)2;
break;
}
switch (tmpcolorimage.colorSpace().transferFunction()) {
case QColorSpace::TransferFunction::Linear:
/* AVIF_TRANSFER_CHARACTERISTICS_LINEAR */
transfer_to_save = (avifTransferCharacteristics)8;
break;
case QColorSpace::TransferFunction::Gamma:
if (qAbs(tmpcolorimage.colorSpace().gamma() - 2.2f) < 0.1f) {
/* AVIF_TRANSFER_CHARACTERISTICS_BT470M */
transfer_to_save = (avifTransferCharacteristics)4;
} else if (qAbs(tmpcolorimage.colorSpace().gamma() - 2.8f) < 0.1f) {
/* AVIF_TRANSFER_CHARACTERISTICS_BT470BG */
transfer_to_save = (avifTransferCharacteristics)5;
} else {
/* AVIF_TRANSFER_CHARACTERISTICS_UNSPECIFIED */
transfer_to_save = (avifTransferCharacteristics)2;
}
break;
case QColorSpace::TransferFunction::SRgb:
/* AVIF_TRANSFER_CHARACTERISTICS_SRGB */
transfer_to_save = (avifTransferCharacteristics)13;
break;
default:
/* AVIF_TRANSFER_CHARACTERISTICS_UNSPECIFIED */
transfer_to_save = (avifTransferCharacteristics)2;
break;
}
// in case primaries or trc were not identified
if ((primaries_to_save == 2) || (transfer_to_save == 2)) {
if (lossless) {
iccprofile = tmpcolorimage.colorSpace().iccProfile();
} else {
// upgrade image to higher bit depth
if (save_depth == 8) {
save_depth = 10;
if (tmpcolorimage.hasAlphaChannel()) {
tmpcolorimage.convertTo(QImage::Format_RGBA64);
} else {
tmpcolorimage.convertTo(QImage::Format_RGBX64);
}
}
if ((primaries_to_save == 2) && (transfer_to_save != 2)) { // other primaries but known trc
primaries_to_save = (avifColorPrimaries)1; // AVIF_COLOR_PRIMARIES_BT709
matrix_to_save = (avifMatrixCoefficients)1; // AVIF_MATRIX_COEFFICIENTS_BT709
switch (transfer_to_save) {
case 8: // AVIF_TRANSFER_CHARACTERISTICS_LINEAR
tmpcolorimage.convertToColorSpace(QColorSpace(QColorSpace::Primaries::SRgb, QColorSpace::TransferFunction::Linear));
break;
case 4: // AVIF_TRANSFER_CHARACTERISTICS_BT470M
tmpcolorimage.convertToColorSpace(QColorSpace(QColorSpace::Primaries::SRgb, 2.2f));
break;
case 5: // AVIF_TRANSFER_CHARACTERISTICS_BT470BG
tmpcolorimage.convertToColorSpace(QColorSpace(QColorSpace::Primaries::SRgb, 2.8f));
break;
default: // AVIF_TRANSFER_CHARACTERISTICS_SRGB + any other
tmpcolorimage.convertToColorSpace(QColorSpace(QColorSpace::Primaries::SRgb, QColorSpace::TransferFunction::SRgb));
transfer_to_save = (avifTransferCharacteristics)13;
break;
}
} else if ((primaries_to_save != 2) && (transfer_to_save == 2)) { // recognized primaries but other trc
transfer_to_save = (avifTransferCharacteristics)13;
tmpcolorimage.convertToColorSpace(tmpcolorimage.colorSpace().withTransferFunction(QColorSpace::TransferFunction::SRgb));
} else { // unrecognized profile
primaries_to_save = (avifColorPrimaries)1; // AVIF_COLOR_PRIMARIES_BT709
transfer_to_save = (avifTransferCharacteristics)13;
matrix_to_save = (avifMatrixCoefficients)1; // AVIF_MATRIX_COEFFICIENTS_BT709
tmpcolorimage.convertToColorSpace(QColorSpace(QColorSpace::Primaries::SRgb, QColorSpace::TransferFunction::SRgb));
}
}
}
} else { // profile is unsupported by Qt
iccprofile = tmpcolorimage.colorSpace().iccProfile();
if (iccprofile.size() > 0) {
matrix_to_save = (avifMatrixCoefficients)6;
}
}
if (lossless && pixel_format == AVIF_PIXEL_FORMAT_YUV444) {
matrix_to_save = (avifMatrixCoefficients)0;
}
avif = avifImageCreate(tmpcolorimage.width(), tmpcolorimage.height(), save_depth, pixel_format);
avif->matrixCoefficients = matrix_to_save;
avif->colorPrimaries = primaries_to_save;
avif->transferCharacteristics = transfer_to_save;
if (iccprofile.size() > 0) {
avifImageSetProfileICC(avif, reinterpret_cast<const uint8_t *>(iccprofile.constData()), iccprofile.size());
}
avifRGBImage rgb;
avifRGBImageSetDefaults(&rgb, avif);
rgb.rowBytes = tmpcolorimage.bytesPerLine();
rgb.pixels = const_cast<uint8_t *>(tmpcolorimage.constBits());
if (save_depth > 8) { // 10bit depth
rgb.depth = 16;
if (!tmpcolorimage.hasAlphaChannel()) {
rgb.ignoreAlpha = AVIF_TRUE;
}
rgb.format = AVIF_RGB_FORMAT_RGBA;
} else { // 8bit depth
rgb.depth = 8;
if (tmpcolorimage.hasAlphaChannel()) {
rgb.format = AVIF_RGB_FORMAT_RGBA;
} else {
rgb.format = AVIF_RGB_FORMAT_RGB;
}
}
res = avifImageRGBToYUV(avif, &rgb);
if (res != AVIF_RESULT_OK) {
qWarning("ERROR in avifImageRGBToYUV: %s", avifResultToString(res));
return false;
}
}
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;
if (image.hasAlphaChannel()) {
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;
res = avifEncoderWrite(encoder, avif, &raw);
avifEncoderDestroy(encoder);
avifImageDestroy(avif);
if (res == AVIF_RESULT_OK) {
qint64 status = device()->write(reinterpret_cast<const char *>(raw.data), raw.size);
avifRWDataFree(&raw);
if (status > 0) {
return true;
} else if (status == -1) {
qWarning("Write error: %s", qUtf8Printable(device()->errorString()));
return false;
}
} else {
qWarning("ERROR: Failed to encode: %s", avifResultToString(res));
}
return false;
}
QVariant QAVIFHandler::option(ImageOption option) const
{
if (option == Quality) {
return m_quality;
}
if (!supportsOption(option) || !ensureParsed()) {
return QVariant();
}
switch (option) {
case Size:
return m_estimated_dimensions;
case Animation:
if (imageCount() >= 2) {
return true;
} else {
return false;
}
default:
return QVariant();
}
}
void QAVIFHandler::setOption(ImageOption option, const QVariant &value)
{
switch (option) {
case Quality:
m_quality = value.toInt();
if (m_quality > 100) {
m_quality = 100;
} else if (m_quality < 0) {
m_quality = KIMG_AVIF_DEFAULT_QUALITY;
}
return;
default:
break;
}
QImageIOHandler::setOption(option, value);
}
bool QAVIFHandler::supportsOption(ImageOption option) const
{
return option == Quality || option == Size || option == Animation;
}
int QAVIFHandler::imageCount() const
{
if (!ensureParsed()) {
return 0;
}
if (m_decoder->imageCount >= 1) {
return m_decoder->imageCount;
}
return 0;
}
int QAVIFHandler::currentImageNumber() const
{
if (m_parseState == ParseAvifNotParsed) {
return -1;
}
if (m_parseState == ParseAvifError || !m_decoder) {
return 0;
}
if (m_parseState == ParseAvifMetadata) {
if (m_decoder->imageCount >= 2) {
return -1;
} else {
return 0;
}
}
return m_decoder->imageIndex;
}
bool QAVIFHandler::jumpToNextImage()
{
if (!ensureParsed()) {
return false;
}
if (m_decoder->imageIndex >= 0) {
if (m_decoder->imageCount < 2) {
m_parseState = ParseAvifSuccess;
return true;
}
if (m_decoder->imageIndex >= m_decoder->imageCount - 1) { // start from beginning
avifDecoderReset(m_decoder);
}
}
avifResult decodeResult = avifDecoderNextImage(m_decoder);
if (decodeResult != AVIF_RESULT_OK) {
qWarning("ERROR: Failed to decode Next image in sequence: %s", avifResultToString(decodeResult));
m_parseState = ParseAvifError;
return false;
}
if ((m_container_width != m_decoder->image->width) || (m_container_height != m_decoder->image->height)) {
qWarning("Decoded image sequence size (%dx%d) do not match first image size (%dx%d)!",
m_decoder->image->width,
m_decoder->image->height,
m_container_width,
m_container_height);
m_parseState = ParseAvifError;
return false;
}
if (decode_one_frame()) {
m_parseState = ParseAvifSuccess;
return true;
} else {
m_parseState = ParseAvifError;
return false;
}
}
bool QAVIFHandler::jumpToImage(int imageNumber)
{
if (!ensureParsed()) {
return false;
}
if (m_decoder->imageCount < 2) { // not an animation
if (imageNumber == 0) {
if (ensureOpened()) {
m_parseState = ParseAvifSuccess;
return true;
}
}
return false;
}
if (imageNumber < 0 || imageNumber >= m_decoder->imageCount) { // wrong index
return false;
}
if (imageNumber == m_decoder->imageIndex) { // we are here already
m_must_jump_to_next_image = false;
m_parseState = ParseAvifSuccess;
return true;
}
avifResult decodeResult = avifDecoderNthImage(m_decoder, imageNumber);
if (decodeResult != AVIF_RESULT_OK) {
qWarning("ERROR: Failed to decode %d th Image in sequence: %s", imageNumber, avifResultToString(decodeResult));
m_parseState = ParseAvifError;
return false;
}
if ((m_container_width != m_decoder->image->width) || (m_container_height != m_decoder->image->height)) {
qWarning("Decoded image sequence size (%dx%d) do not match declared container size (%dx%d)!",
m_decoder->image->width,
m_decoder->image->height,
m_container_width,
m_container_height);
m_parseState = ParseAvifError;
return false;
}
if (decode_one_frame()) {
m_parseState = ParseAvifSuccess;
return true;
} else {
m_parseState = ParseAvifError;
return false;
}
}
int QAVIFHandler::nextImageDelay() const
{
if (!ensureOpened()) {
return 0;
}
if (m_decoder->imageCount < 2) {
return 0;
}
int delay_ms = 1000.0 * m_decoder->imageTiming.duration;
if (delay_ms < 1) {
delay_ms = 1;
}
return delay_ms;
}
int QAVIFHandler::loopCount() const
{
if (!ensureParsed()) {
return 0;
}
if (m_decoder->imageCount < 2) {
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;
}
QPointF QAVIFHandler::CompatibleChromacity(qreal chrX, qreal chrY)
{
chrX = qBound(qreal(0.0), chrX, qreal(1.0));
chrY = qBound(qreal(DBL_MIN), chrY, qreal(1.0));
if ((chrX + chrY) > qreal(1.0)) {
chrX = qreal(1.0) - chrY;
}
return QPointF(chrX, chrY);
}
QImageIOPlugin::Capabilities QAVIFPlugin::capabilities(QIODevice *device, const QByteArray &format) const
{
static const bool isAvifDecoderAvailable(avifCodecName(AVIF_CODEC_CHOICE_AUTO, AVIF_CODEC_FLAG_CAN_DECODE) != nullptr);
static const bool isAvifEncoderAvailable(avifCodecName(AVIF_CODEC_CHOICE_AUTO, AVIF_CODEC_FLAG_CAN_ENCODE) != nullptr);
if (format == "avif") {
Capabilities format_cap;
if (isAvifDecoderAvailable) {
format_cap |= CanRead;
}
if (isAvifEncoderAvailable) {
format_cap |= CanWrite;
}
return format_cap;
}
if (format == "avifs") {
Capabilities format_cap;
if (isAvifDecoderAvailable) {
format_cap |= CanRead;
}
return format_cap;
}
if (!format.isEmpty()) {
return {};
}
if (!device->isOpen()) {
return {};
}
Capabilities cap;
if (device->isReadable() && QAVIFHandler::canRead(device) && isAvifDecoderAvailable) {
cap |= CanRead;
}
if (device->isWritable() && isAvifEncoderAvailable) {
cap |= CanWrite;
}
return cap;
}
QImageIOHandler *QAVIFPlugin::create(QIODevice *device, const QByteArray &format) const
{
QImageIOHandler *handler = new QAVIFHandler;
handler->setDevice(device);
handler->setFormat(format);
return handler;
}
#include "moc_avif_p.cpp"
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