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JXL: fixed bug when saving grayscale images without color profile

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Saving grayscale images at less than 100% quality made the file unreadable.
Fix also a regression while loading GrayA images introduced with MR !250
This commit is contained in:
Mirco Miranda 2024-11-06 21:15:04 +00:00 committed by Albert Astals Cid
parent c38a1a0248
commit a664baa9f9
3 changed files with 8 additions and 10 deletions
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autotests/read/jxl/testcard_graya.jxl Normal file
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18
src/imageformats/jxl.cpp
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@ -243,23 +243,21 @@ bool QJpegXLHandler::countALLFrames()
return false;
}
bool is_gray = m_basicinfo.num_color_channels == 1 && m_basicinfo.num_extra_channels == 0;
JxlColorEncoding color_encoding;
if (m_basicinfo.uses_original_profile == JXL_FALSE) {
JxlColorEncodingSetToSRGB(&color_encoding, JXL_FALSE);
JxlColorEncodingSetToSRGB(&color_encoding, is_gray ? JXL_TRUE : JXL_FALSE);
JxlDecoderSetPreferredColorProfile(m_decoder, &color_encoding);
}
bool loadalpha;
bool loadalpha = false;
if (m_basicinfo.alpha_bits > 0) {
loadalpha = true;
} else {
loadalpha = false;
}
m_input_pixel_format.endianness = JXL_NATIVE_ENDIAN;
m_input_pixel_format.align = 0;
m_input_pixel_format.num_channels = m_basicinfo.num_color_channels == 1 ? 1 : 4;
m_input_pixel_format.num_channels = is_gray ? 1 : 4;
if (m_basicinfo.bits_per_sample > 8) { // high bit depth
#ifdef JXL_HDR_PRESERVATION_DISABLED
@ -270,7 +268,7 @@ bool QJpegXLHandler::countALLFrames()
m_input_pixel_format.data_type = is_fp ? JXL_TYPE_FLOAT16 : JXL_TYPE_UINT16;
m_buffer_size = (size_t)m_basicinfo.xsize * (size_t)m_basicinfo.ysize * m_input_pixel_format.num_channels * 2;
if (m_basicinfo.num_color_channels == 1) {
if (is_gray) {
m_input_pixel_format.data_type = JXL_TYPE_UINT16;
m_input_image_format = m_target_image_format = QImage::Format_Grayscale16;
m_buffer_size = (size_t)m_basicinfo.xsize * (size_t)m_basicinfo.ysize * m_input_pixel_format.num_channels * 2;
@ -294,7 +292,7 @@ bool QJpegXLHandler::countALLFrames()
m_input_pixel_format.data_type = JXL_TYPE_UINT8;
m_buffer_size = (size_t)m_basicinfo.xsize * (size_t)m_basicinfo.ysize * m_input_pixel_format.num_channels;
if (m_basicinfo.num_color_channels == 1) {
if (is_gray) {
m_input_image_format = m_target_image_format = QImage::Format_Grayscale8;
} else {
m_input_image_format = QImage::Format_RGBA8888;
@ -630,7 +628,7 @@ bool QJpegXLHandler::write(const QImage &image)
// no profile or Qt-unsupported ICC profile
iccprofile = tmpcs.iccProfile();
// note: lossless encoding requires uses_original_profile = JXL_TRUE
if (iccprofile.size() > 0 || m_quality == 100) {
if (iccprofile.size() > 0 || m_quality == 100 || is_gray) {
output_info.uses_original_profile = JXL_TRUE;
}
}
@ -808,7 +806,7 @@ bool QJpegXLHandler::write(const QImage &image)
}
} else {
JxlColorEncoding color_profile;
JxlColorEncodingSetToSRGB(&color_profile, JXL_FALSE);
JxlColorEncodingSetToSRGB(&color_profile, is_gray ? JXL_TRUE : JXL_FALSE);
status = JxlEncoderSetColorEncoding(encoder, &color_profile);
if (status != JXL_ENC_SUCCESS) {