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Fix build if UPSAMPLE_MERGING_SUPPORTED undefined

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Although it is uncommon, some downstream implementations undefine one or
more of the *_SUPPORTED macros in jmorecfg.h in order to reduce the size
of the library.  In the interest of maintaining backward compatibility
with libjpeg, this is still a supported use case.

Regression introduced by 9120a24743

Based on:
74c4d032f0

Closes #601
This commit is contained in:
DRC
2022-05-27 11:59:56 -05:00
parent fac8381441
commit a405519e96
1 changed files with 8 additions and 0 deletions
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8
jdapistd.c
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@@ -159,7 +159,9 @@ jpeg_crop_scanline(j_decompress_ptr cinfo, JDIMENSION *xoffset,
JDIMENSION input_xoffset;
boolean reinit_upsampler = FALSE;
jpeg_component_info *compptr;
#ifdef UPSAMPLE_MERGING_SUPPORTED
my_master_ptr master = (my_master_ptr)cinfo->master;
#endif
if (cinfo->global_state != DSTATE_SCANNING || cinfo->output_scanline != 0)
ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
@@ -209,11 +211,13 @@ jpeg_crop_scanline(j_decompress_ptr cinfo, JDIMENSION *xoffset,
*/
*width = *width + input_xoffset - *xoffset;
cinfo->output_width = *width;
#ifdef UPSAMPLE_MERGING_SUPPORTED
if (master->using_merged_upsample && cinfo->max_v_samp_factor == 2) {
my_merged_upsample_ptr upsample = (my_merged_upsample_ptr)cinfo->upsample;
upsample->out_row_width =
cinfo->output_width * cinfo->out_color_components;
}
#endif
/* Set the first and last iMCU columns that we must decompress. These values
* will be used in single-scan decompressions.
@@ -324,7 +328,9 @@ LOCAL(void)
read_and_discard_scanlines(j_decompress_ptr cinfo, JDIMENSION num_lines)
{
JDIMENSION n;
#ifdef UPSAMPLE_MERGING_SUPPORTED
my_master_ptr master = (my_master_ptr)cinfo->master;
#endif
JSAMPLE dummy_sample[1] = { 0 };
JSAMPROW dummy_row = dummy_sample;
JSAMPARRAY scanlines = NULL;
@@ -348,10 +354,12 @@ read_and_discard_scanlines(j_decompress_ptr cinfo, JDIMENSION num_lines)
cinfo->cquantize->color_quantize = noop_quantize;
}
#ifdef UPSAMPLE_MERGING_SUPPORTED
if (master->using_merged_upsample && cinfo->max_v_samp_factor == 2) {
my_merged_upsample_ptr upsample = (my_merged_upsample_ptr)cinfo->upsample;
scanlines = &upsample->spare_row;
}
#endif
for (n = 0; n < num_lines; n++)
jpeg_read_scanlines(cinfo, scanlines, 1);