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add force_baseline which limit output of quantization table to 255 when giving a quality and a qantization table

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This commit is contained in:
Kylian Ronfleux--Corail 2025-04-14 08:07:11 +00:00
parent 5d82c79c2f
commit 32590baeec
1 changed files with 4 additions and 2 deletions
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6
src/libImaging/JpegEncode.c
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@ -175,8 +175,10 @@ ImagingJpegEncode(Imaging im, ImagingCodecState state, UINT8 *buf, int bytes) {
int i;
int quality = 50;
int last_q = 0;
boolean force_baseline = FALSE;
if (context->quality != -1) {
quality = context->quality;
force_baseline = TRUE;
}
int scale_factor = jpeg_quality_scaling(quality);
for (i = 0; i < context->qtablesLen; i++) {
@ -185,7 +187,7 @@ ImagingJpegEncode(Imaging im, ImagingCodecState state, UINT8 *buf, int bytes) {
i,
&context->qtables[i * DCTSIZE2],
scale_factor,
FALSE
force_baseline
);
context->cinfo.comp_info[i].quant_tbl_no = i;
last_q = i;
@ -194,7 +196,7 @@ ImagingJpegEncode(Imaging im, ImagingCodecState state, UINT8 *buf, int bytes) {
// jpeg_set_defaults created two qtables internally, but we only
// wanted one.
jpeg_add_quant_table(
&context->cinfo, 1, &context->qtables[0], scale_factor, FALSE
&context->cinfo, 1, &context->qtables[0], scale_factor, force_baseline
);
}
for (i = last_q; i < context->cinfo.num_components; i++) {