01e3032354
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
185 lines
5.6 KiB
C
185 lines
5.6 KiB
C
/*
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* jdmrgext.c
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*
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* This file was part of the Independent JPEG Group's software:
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* Copyright (C) 1994-1996, Thomas G. Lane.
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* libjpeg-turbo Modifications:
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* Copyright (C) 2011, 2015, D. R. Commander.
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* For conditions of distribution and use, see the accompanying README.ijg
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* file.
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*
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* This file contains code for merged upsampling/color conversion.
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*/
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/* This file is included by jdmerge.c */
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/*
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* Upsample and color convert for the case of 2:1 horizontal and 1:1 vertical.
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*/
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INLINE
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LOCAL(void)
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h2v1_merged_upsample_internal(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
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JDIMENSION in_row_group_ctr,
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JSAMPARRAY output_buf)
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{
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my_upsample_ptr upsample = (my_upsample_ptr)cinfo->upsample;
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register int y, cred, cgreen, cblue;
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int cb, cr;
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register JSAMPROW outptr;
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JSAMPROW inptr0, inptr1, inptr2;
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JDIMENSION col;
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/* copy these pointers into registers if possible */
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register JSAMPLE *range_limit = cinfo->sample_range_limit;
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int *Crrtab = upsample->Cr_r_tab;
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int *Cbbtab = upsample->Cb_b_tab;
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JLONG *Crgtab = upsample->Cr_g_tab;
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JLONG *Cbgtab = upsample->Cb_g_tab;
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SHIFT_TEMPS
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inptr0 = input_buf[0][in_row_group_ctr];
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inptr1 = input_buf[1][in_row_group_ctr];
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inptr2 = input_buf[2][in_row_group_ctr];
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outptr = output_buf[0];
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/* Loop for each pair of output pixels */
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for (col = cinfo->output_width >> 1; col > 0; col--) {
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/* Do the chroma part of the calculation */
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cb = *inptr1++;
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cr = *inptr2++;
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cred = Crrtab[cr];
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cgreen = (int)RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS);
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cblue = Cbbtab[cb];
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/* Fetch 2 Y values and emit 2 pixels */
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y = *inptr0++;
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outptr[RGB_RED] = range_limit[y + cred];
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outptr[RGB_GREEN] = range_limit[y + cgreen];
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outptr[RGB_BLUE] = range_limit[y + cblue];
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#ifdef RGB_ALPHA
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outptr[RGB_ALPHA] = 0xFF;
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#endif
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outptr += RGB_PIXELSIZE;
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y = *inptr0++;
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outptr[RGB_RED] = range_limit[y + cred];
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outptr[RGB_GREEN] = range_limit[y + cgreen];
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outptr[RGB_BLUE] = range_limit[y + cblue];
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#ifdef RGB_ALPHA
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outptr[RGB_ALPHA] = 0xFF;
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#endif
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outptr += RGB_PIXELSIZE;
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}
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/* If image width is odd, do the last output column separately */
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if (cinfo->output_width & 1) {
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cb = *inptr1;
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cr = *inptr2;
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cred = Crrtab[cr];
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cgreen = (int)RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS);
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cblue = Cbbtab[cb];
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y = *inptr0;
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outptr[RGB_RED] = range_limit[y + cred];
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outptr[RGB_GREEN] = range_limit[y + cgreen];
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outptr[RGB_BLUE] = range_limit[y + cblue];
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#ifdef RGB_ALPHA
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outptr[RGB_ALPHA] = 0xFF;
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#endif
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}
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}
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/*
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* Upsample and color convert for the case of 2:1 horizontal and 2:1 vertical.
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*/
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INLINE
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LOCAL(void)
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h2v2_merged_upsample_internal(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
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JDIMENSION in_row_group_ctr,
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JSAMPARRAY output_buf)
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{
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my_upsample_ptr upsample = (my_upsample_ptr)cinfo->upsample;
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register int y, cred, cgreen, cblue;
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int cb, cr;
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register JSAMPROW outptr0, outptr1;
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JSAMPROW inptr00, inptr01, inptr1, inptr2;
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JDIMENSION col;
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/* copy these pointers into registers if possible */
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register JSAMPLE *range_limit = cinfo->sample_range_limit;
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int *Crrtab = upsample->Cr_r_tab;
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int *Cbbtab = upsample->Cb_b_tab;
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JLONG *Crgtab = upsample->Cr_g_tab;
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JLONG *Cbgtab = upsample->Cb_g_tab;
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SHIFT_TEMPS
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inptr00 = input_buf[0][in_row_group_ctr * 2];
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inptr01 = input_buf[0][in_row_group_ctr * 2 + 1];
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inptr1 = input_buf[1][in_row_group_ctr];
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inptr2 = input_buf[2][in_row_group_ctr];
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outptr0 = output_buf[0];
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outptr1 = output_buf[1];
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/* Loop for each group of output pixels */
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for (col = cinfo->output_width >> 1; col > 0; col--) {
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/* Do the chroma part of the calculation */
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cb = *inptr1++;
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cr = *inptr2++;
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cred = Crrtab[cr];
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cgreen = (int)RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS);
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cblue = Cbbtab[cb];
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/* Fetch 4 Y values and emit 4 pixels */
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y = *inptr00++;
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outptr0[RGB_RED] = range_limit[y + cred];
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outptr0[RGB_GREEN] = range_limit[y + cgreen];
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outptr0[RGB_BLUE] = range_limit[y + cblue];
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#ifdef RGB_ALPHA
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outptr0[RGB_ALPHA] = 0xFF;
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#endif
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outptr0 += RGB_PIXELSIZE;
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y = *inptr00++;
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outptr0[RGB_RED] = range_limit[y + cred];
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outptr0[RGB_GREEN] = range_limit[y + cgreen];
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outptr0[RGB_BLUE] = range_limit[y + cblue];
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#ifdef RGB_ALPHA
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outptr0[RGB_ALPHA] = 0xFF;
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#endif
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outptr0 += RGB_PIXELSIZE;
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y = *inptr01++;
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outptr1[RGB_RED] = range_limit[y + cred];
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outptr1[RGB_GREEN] = range_limit[y + cgreen];
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outptr1[RGB_BLUE] = range_limit[y + cblue];
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#ifdef RGB_ALPHA
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outptr1[RGB_ALPHA] = 0xFF;
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#endif
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outptr1 += RGB_PIXELSIZE;
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y = *inptr01++;
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outptr1[RGB_RED] = range_limit[y + cred];
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outptr1[RGB_GREEN] = range_limit[y + cgreen];
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outptr1[RGB_BLUE] = range_limit[y + cblue];
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#ifdef RGB_ALPHA
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outptr1[RGB_ALPHA] = 0xFF;
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#endif
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outptr1 += RGB_PIXELSIZE;
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}
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/* If image width is odd, do the last output column separately */
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if (cinfo->output_width & 1) {
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cb = *inptr1;
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cr = *inptr2;
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cred = Crrtab[cr];
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cgreen = (int)RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS);
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cblue = Cbbtab[cb];
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y = *inptr00;
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outptr0[RGB_RED] = range_limit[y + cred];
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outptr0[RGB_GREEN] = range_limit[y + cgreen];
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outptr0[RGB_BLUE] = range_limit[y + cblue];
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#ifdef RGB_ALPHA
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outptr0[RGB_ALPHA] = 0xFF;
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#endif
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y = *inptr01;
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outptr1[RGB_RED] = range_limit[y + cred];
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outptr1[RGB_GREEN] = range_limit[y + cgreen];
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outptr1[RGB_BLUE] = range_limit[y + cblue];
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#ifdef RGB_ALPHA
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outptr1[RGB_ALPHA] = 0xFF;
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#endif
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}
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}
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