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Fix #64

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Setting a user-defined quality level in cjpeg was incorrectly setting
quantization table
This commit is contained in:
Frank Bossen
2014-07-09 11:37:21 +09:00
parent 0c59a4daf6
commit 55e3e7e819
2 changed files with 32 additions and 8 deletions
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7
jcparam.c
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@@ -110,11 +110,18 @@ jpeg_default_qtables (j_compress_ptr cinfo, boolean force_baseline)
*/
{
/* Set up two quantization tables using the specified scaling */
if (cinfo->use_flat_quant_tbl) {
jpeg_add_quant_table(cinfo, 0, flat_quant_tbl,
cinfo->q_scale_factor[0], force_baseline);
jpeg_add_quant_table(cinfo, 1, flat_quant_tbl,
cinfo->q_scale_factor[1], force_baseline);
} else {
jpeg_add_quant_table(cinfo, 0, std_luminance_quant_tbl,
cinfo->q_scale_factor[0], force_baseline);
jpeg_add_quant_table(cinfo, 1, std_chrominance_quant_tbl,
cinfo->q_scale_factor[1], force_baseline);
}
}
#endif

17
rdswitch.c
View File

@@ -300,15 +300,32 @@ static const unsigned int std_chrominance_quant_tbl[DCTSIZE2] = {
99, 99, 99, 99, 99, 99, 99, 99
};
static const unsigned int flat_quant_tbl[DCTSIZE2] = {
16, 16, 16, 16, 16, 16, 16, 16,
16, 16, 16, 16, 16, 16, 16, 16,
16, 16, 16, 16, 16, 16, 16, 16,
16, 16, 16, 16, 16, 16, 16, 16,
16, 16, 16, 16, 16, 16, 16, 16,
16, 16, 16, 16, 16, 16, 16, 16,
16, 16, 16, 16, 16, 16, 16, 16,
16, 16, 16, 16, 16, 16, 16, 16
};
LOCAL(void)
jpeg_default_qtables (j_compress_ptr cinfo, boolean force_baseline)
{
if (cinfo->use_flat_quant_tbl) {
jpeg_add_quant_table(cinfo, 0, flat_quant_tbl,
q_scale_factor[0], force_baseline);
jpeg_add_quant_table(cinfo, 1, flat_quant_tbl,
q_scale_factor[1], force_baseline);
} else {
jpeg_add_quant_table(cinfo, 0, std_luminance_quant_tbl,
q_scale_factor[0], force_baseline);
jpeg_add_quant_table(cinfo, 1, std_chrominance_quant_tbl,
q_scale_factor[1], force_baseline);
}
}
#endif