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Eliminate support for compilers w/o unsigned char

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libjpeg-turbo has never really supported such compilers, since (AFAIK)
they are non-existent on any modern computing platform and thus
impossible for us to test.  (Also, the TurboJPEG API would break without
unsigned chars.)

Furthermore, the unified CMake-based build system introduced in 2.0
always defines HAVE_UNSIGNED_CHAR, so retaining other code paths is
pointless.  Eliminating support for compilers without unsigned char
eliminates the need for the GETJSAMPLE() macro, which improves the
readability of many parts of the code as well as improving the
performance of writing Targa and Windows BMP files.

Fixes #317
This commit is contained in:
DRC
2019-01-23 14:58:24 -06:00
parent 42d62bf114
commit 01e3032354
30 changed files with 266 additions and 388 deletions
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28
jdsample.c
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@@ -176,7 +176,7 @@ int_upsample(j_decompress_ptr cinfo, jpeg_component_info *compptr,
outptr = output_data[outrow];
outend = outptr + cinfo->output_width;
while (outptr < outend) {
invalue = *inptr++; /* don't need GETJSAMPLE() here */
invalue = *inptr++;
for (h = h_expand; h > 0; h--) {
*outptr++ = invalue;
}
@@ -212,7 +212,7 @@ h2v1_upsample(j_decompress_ptr cinfo, jpeg_component_info *compptr,
outptr = output_data[inrow];
outend = outptr + cinfo->output_width;
while (outptr < outend) {
invalue = *inptr++; /* don't need GETJSAMPLE() here */
invalue = *inptr++;
*outptr++ = invalue;
*outptr++ = invalue;
}
@@ -241,7 +241,7 @@ h2v2_upsample(j_decompress_ptr cinfo, jpeg_component_info *compptr,
outptr = output_data[outrow];
outend = outptr + cinfo->output_width;
while (outptr < outend) {
invalue = *inptr++; /* don't need GETJSAMPLE() here */
invalue = *inptr++;
*outptr++ = invalue;
*outptr++ = invalue;
}
@@ -282,20 +282,20 @@ h2v1_fancy_upsample(j_decompress_ptr cinfo, jpeg_component_info *compptr,
inptr = input_data[inrow];
outptr = output_data[inrow];
/* Special case for first column */
invalue = GETJSAMPLE(*inptr++);
invalue = *inptr++;
*outptr++ = (JSAMPLE)invalue;
*outptr++ = (JSAMPLE)((invalue * 3 + GETJSAMPLE(*inptr) + 2) >> 2);
*outptr++ = (JSAMPLE)((invalue * 3 + inptr[0] + 2) >> 2);
for (colctr = compptr->downsampled_width - 2; colctr > 0; colctr--) {
/* General case: 3/4 * nearer pixel + 1/4 * further pixel */
invalue = GETJSAMPLE(*inptr++) * 3;
*outptr++ = (JSAMPLE)((invalue + GETJSAMPLE(inptr[-2]) + 1) >> 2);
*outptr++ = (JSAMPLE)((invalue + GETJSAMPLE(*inptr) + 2) >> 2);
invalue = (*inptr++) * 3;
*outptr++ = (JSAMPLE)((invalue + inptr[-2] + 1) >> 2);
*outptr++ = (JSAMPLE)((invalue + inptr[0] + 2) >> 2);
}
/* Special case for last column */
invalue = GETJSAMPLE(*inptr);
*outptr++ = (JSAMPLE)((invalue * 3 + GETJSAMPLE(inptr[-1]) + 1) >> 2);
invalue = *inptr;
*outptr++ = (JSAMPLE)((invalue * 3 + inptr[-1] + 1) >> 2);
*outptr++ = (JSAMPLE)invalue;
}
}
@@ -334,7 +334,7 @@ h1v2_fancy_upsample(j_decompress_ptr cinfo, jpeg_component_info *compptr,
outptr = output_data[outrow++];
for (colctr = 0; colctr < compptr->downsampled_width; colctr++) {
thiscolsum = GETJSAMPLE(*inptr0++) * 3 + GETJSAMPLE(*inptr1++);
thiscolsum = (*inptr0++) * 3 + (*inptr1++);
*outptr++ = (JSAMPLE)((thiscolsum + 1) >> 2);
}
}
@@ -377,8 +377,8 @@ h2v2_fancy_upsample(j_decompress_ptr cinfo, jpeg_component_info *compptr,
outptr = output_data[outrow++];
/* Special case for first column */
thiscolsum = GETJSAMPLE(*inptr0++) * 3 + GETJSAMPLE(*inptr1++);
nextcolsum = GETJSAMPLE(*inptr0++) * 3 + GETJSAMPLE(*inptr1++);
thiscolsum = (*inptr0++) * 3 + (*inptr1++);
nextcolsum = (*inptr0++) * 3 + (*inptr1++);
*outptr++ = (JSAMPLE)((thiscolsum * 4 + 8) >> 4);
*outptr++ = (JSAMPLE)((thiscolsum * 3 + nextcolsum + 7) >> 4);
lastcolsum = thiscolsum; thiscolsum = nextcolsum;
@@ -386,7 +386,7 @@ h2v2_fancy_upsample(j_decompress_ptr cinfo, jpeg_component_info *compptr,
for (colctr = compptr->downsampled_width - 2; colctr > 0; colctr--) {
/* General case: 3/4 * nearer pixel + 1/4 * further pixel in each */
/* dimension, thus 9/16, 3/16, 3/16, 1/16 overall */
nextcolsum = GETJSAMPLE(*inptr0++) * 3 + GETJSAMPLE(*inptr1++);
nextcolsum = (*inptr0++) * 3 + (*inptr1++);
*outptr++ = (JSAMPLE)((thiscolsum * 3 + lastcolsum + 8) >> 4);
*outptr++ = (JSAMPLE)((thiscolsum * 3 + nextcolsum + 7) >> 4);
lastcolsum = thiscolsum; thiscolsum = nextcolsum;