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Do not use MozJPEG progressive default

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This commit is contained in:
Andrew Murray 2024-12-31 21:40:12 +11:00
parent 06e02cc1d9
commit ae59b03956
2 changed files with 20 additions and 4 deletions
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13
Tests/test_file_jpeg.py
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@ -281,7 +281,10 @@ class TestFileJpeg:
assert not im2.info.get("progressive")
assert im3.info.get("progressive")
assert_image_equal(im1, im3)
if features.check_feature("mozjpeg"):
assert_image_similar(im1, im3, 9.39)
else:
assert_image_equal(im1, im3)
assert im1_bytes >= im3_bytes
def test_progressive_large_buffer(self, tmp_path: Path) -> None:
@ -424,8 +427,12 @@ class TestFileJpeg:
im2 = self.roundtrip(hopper(), progressive=1)
im3 = self.roundtrip(hopper(), progression=1) # compatibility
assert_image_equal(im1, im2)
assert_image_equal(im1, im3)
if features.check_feature("mozjpeg"):
assert_image_similar(im1, im2, 9.39)
assert_image_similar(im1, im3, 9.39)
else:
assert_image_equal(im1, im2)
assert_image_equal(im1, im3)
assert im2.info.get("progressive")
assert im2.info.get("progression")
assert im3.info.get("progressive")

11
src/libImaging/JpegEncode.c
View File

@ -134,7 +134,16 @@ ImagingJpegEncode(Imaging im, ImagingCodecState state, UINT8 *buf, int bytes) {
return -1;
}
/* Compressor configuration */
/* Compressor configuration */
#ifdef JPEG_C_PARAM_SUPPORTED
/* MozJPEG */
if (!context->progressive) {
/* Do not use MozJPEG progressive default */
jpeg_c_set_int_param(
&context->cinfo, JINT_COMPRESS_PROFILE, JCP_FASTEST
);
}
#endif
jpeg_set_defaults(&context->cinfo);
/* Prevent RGB -> YCbCr conversion */