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avif: new quality settings

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Backported from master
This commit is contained in:
Daniel Novomeský
2023-12-13 17:11:11 +01:00
parent 8cc25c39b4
commit c09b88b7c6
1 changed files with 53 additions and 5 deletions
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58
src/imageformats/avif.cpp
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@ -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) {
@ -646,8 +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
@ -807,6 +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;
@ -814,6 +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;
@ -870,7 +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: