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Unified Diff: jdmrg565.c

Issue 1270213002: Add support for decoding to 565 to libjpeg_turbo (Closed) Base URL: https://chromium.googlesource.com/chromium/deps/libjpeg_turbo.git@master
Patch Set: Link crbug in the README Created 5 years, 4 months ago
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Index: jdmrg565.c
diff --git a/jdmrg565.c b/jdmrg565.c
new file mode 100644
index 0000000000000000000000000000000000000000..0a10bccb4ee20047c392a762add4769e3d647d07
--- /dev/null
+++ b/jdmrg565.c
@@ -0,0 +1,355 @@
+/*
+ * jdmrg565.c
+ *
+ * This file was part of the Independent JPEG Group's software:
+ * Copyright (C) 1994-1996, Thomas G. Lane.
+ * libjpeg-turbo Modifications:
+ * Copyright (C) 2013, Linaro Limited.
+ * Copyright (C) 2014, D. R. Commander.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains code for merged upsampling/color conversion.
+ */
+
+
+INLINE
+LOCAL(void)
+h2v1_merged_upsample_565_internal (j_decompress_ptr cinfo,
+ JSAMPIMAGE input_buf,
+ JDIMENSION in_row_group_ctr,
+ JSAMPARRAY output_buf)
+{
+ my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
+ register int y, cred, cgreen, cblue;
+ int cb, cr;
+ register JSAMPROW outptr;
+ JSAMPROW inptr0, inptr1, inptr2;
+ JDIMENSION col;
+ /* copy these pointers into registers if possible */
+ register JSAMPLE * range_limit = cinfo->sample_range_limit;
+ int * Crrtab = upsample->Cr_r_tab;
+ int * Cbbtab = upsample->Cb_b_tab;
+ INT32 * Crgtab = upsample->Cr_g_tab;
+ INT32 * Cbgtab = upsample->Cb_g_tab;
+ unsigned int r, g, b;
+ INT32 rgb;
+ SHIFT_TEMPS
+
+ inptr0 = input_buf[0][in_row_group_ctr];
+ inptr1 = input_buf[1][in_row_group_ctr];
+ inptr2 = input_buf[2][in_row_group_ctr];
+ outptr = output_buf[0];
+
+ /* Loop for each pair of output pixels */
+ for (col = cinfo->output_width >> 1; col > 0; col--) {
+ /* Do the chroma part of the calculation */
+ cb = GETJSAMPLE(*inptr1++);
+ cr = GETJSAMPLE(*inptr2++);
+ cred = Crrtab[cr];
+ cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS);
+ cblue = Cbbtab[cb];
+
+ /* Fetch 2 Y values and emit 2 pixels */
+ y = GETJSAMPLE(*inptr0++);
+ r = range_limit[y + cred];
+ g = range_limit[y + cgreen];
+ b = range_limit[y + cblue];
+ rgb = PACK_SHORT_565(r, g, b);
+
+ y = GETJSAMPLE(*inptr0++);
+ r = range_limit[y + cred];
+ g = range_limit[y + cgreen];
+ b = range_limit[y + cblue];
+ rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(r, g, b));
+
+ WRITE_TWO_PIXELS(outptr, rgb);
+ outptr += 4;
+ }
+
+ /* If image width is odd, do the last output column separately */
+ if (cinfo->output_width & 1) {
+ cb = GETJSAMPLE(*inptr1);
+ cr = GETJSAMPLE(*inptr2);
+ cred = Crrtab[cr];
+ cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS);
+ cblue = Cbbtab[cb];
+ y = GETJSAMPLE(*inptr0);
+ r = range_limit[y + cred];
+ g = range_limit[y + cgreen];
+ b = range_limit[y + cblue];
+ rgb = PACK_SHORT_565(r, g, b);
+ *(INT16*)outptr = rgb;
+ }
+ }
+
+
+INLINE
+LOCAL(void)
+h2v1_merged_upsample_565D_internal (j_decompress_ptr cinfo,
+ JSAMPIMAGE input_buf,
+ JDIMENSION in_row_group_ctr,
+ JSAMPARRAY output_buf)
+{
+ my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
+ register int y, cred, cgreen, cblue;
+ int cb, cr;
+ register JSAMPROW outptr;
+ JSAMPROW inptr0, inptr1, inptr2;
+ JDIMENSION col;
+ /* copy these pointers into registers if possible */
+ register JSAMPLE * range_limit = cinfo->sample_range_limit;
+ int * Crrtab = upsample->Cr_r_tab;
+ int * Cbbtab = upsample->Cb_b_tab;
+ INT32 * Crgtab = upsample->Cr_g_tab;
+ INT32 * Cbgtab = upsample->Cb_g_tab;
+ INT32 d0 = dither_matrix[cinfo->output_scanline & DITHER_MASK];
+ unsigned int r, g, b;
+ INT32 rgb;
+ SHIFT_TEMPS
+
+ inptr0 = input_buf[0][in_row_group_ctr];
+ inptr1 = input_buf[1][in_row_group_ctr];
+ inptr2 = input_buf[2][in_row_group_ctr];
+ outptr = output_buf[0];
+
+ /* Loop for each pair of output pixels */
+ for (col = cinfo->output_width >> 1; col > 0; col--) {
+ /* Do the chroma part of the calculation */
+ cb = GETJSAMPLE(*inptr1++);
+ cr = GETJSAMPLE(*inptr2++);
+ cred = Crrtab[cr];
+ cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS);
+ cblue = Cbbtab[cb];
+
+ /* Fetch 2 Y values and emit 2 pixels */
+ y = GETJSAMPLE(*inptr0++);
+ r = range_limit[DITHER_565_R(y + cred, d0)];
+ g = range_limit[DITHER_565_G(y + cgreen, d0)];
+ b = range_limit[DITHER_565_B(y + cblue, d0)];
+ d0 = DITHER_ROTATE(d0);
+ rgb = PACK_SHORT_565(r, g, b);
+
+ y = GETJSAMPLE(*inptr0++);
+ r = range_limit[DITHER_565_R(y + cred, d0)];
+ g = range_limit[DITHER_565_G(y + cgreen, d0)];
+ b = range_limit[DITHER_565_B(y + cblue, d0)];
+ d0 = DITHER_ROTATE(d0);
+ rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(r, g, b));
+
+ WRITE_TWO_PIXELS(outptr, rgb);
+ outptr += 4;
+ }
+
+ /* If image width is odd, do the last output column separately */
+ if (cinfo->output_width & 1) {
+ cb = GETJSAMPLE(*inptr1);
+ cr = GETJSAMPLE(*inptr2);
+ cred = Crrtab[cr];
+ cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS);
+ cblue = Cbbtab[cb];
+ y = GETJSAMPLE(*inptr0);
+ r = range_limit[DITHER_565_R(y + cred, d0)];
+ g = range_limit[DITHER_565_G(y + cgreen, d0)];
+ b = range_limit[DITHER_565_B(y + cblue, d0)];
+ rgb = PACK_SHORT_565(r, g, b);
+ *(INT16*)outptr = rgb;
+ }
+}
+
+
+INLINE
+LOCAL(void)
+h2v2_merged_upsample_565_internal (j_decompress_ptr cinfo,
+ JSAMPIMAGE input_buf,
+ JDIMENSION in_row_group_ctr,
+ JSAMPARRAY output_buf)
+{
+ my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
+ register int y, cred, cgreen, cblue;
+ int cb, cr;
+ register JSAMPROW outptr0, outptr1;
+ JSAMPROW inptr00, inptr01, inptr1, inptr2;
+ JDIMENSION col;
+ /* copy these pointers into registers if possible */
+ register JSAMPLE * range_limit = cinfo->sample_range_limit;
+ int * Crrtab = upsample->Cr_r_tab;
+ int * Cbbtab = upsample->Cb_b_tab;
+ INT32 * Crgtab = upsample->Cr_g_tab;
+ INT32 * Cbgtab = upsample->Cb_g_tab;
+ unsigned int r, g, b;
+ INT32 rgb;
+ SHIFT_TEMPS
+
+ inptr00 = input_buf[0][in_row_group_ctr * 2];
+ inptr01 = input_buf[0][in_row_group_ctr * 2 + 1];
+ inptr1 = input_buf[1][in_row_group_ctr];
+ inptr2 = input_buf[2][in_row_group_ctr];
+ outptr0 = output_buf[0];
+ outptr1 = output_buf[1];
+
+ /* Loop for each group of output pixels */
+ for (col = cinfo->output_width >> 1; col > 0; col--) {
+ /* Do the chroma part of the calculation */
+ cb = GETJSAMPLE(*inptr1++);
+ cr = GETJSAMPLE(*inptr2++);
+ cred = Crrtab[cr];
+ cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS);
+ cblue = Cbbtab[cb];
+
+ /* Fetch 4 Y values and emit 4 pixels */
+ y = GETJSAMPLE(*inptr00++);
+ r = range_limit[y + cred];
+ g = range_limit[y + cgreen];
+ b = range_limit[y + cblue];
+ rgb = PACK_SHORT_565(r, g, b);
+
+ y = GETJSAMPLE(*inptr00++);
+ r = range_limit[y + cred];
+ g = range_limit[y + cgreen];
+ b = range_limit[y + cblue];
+ rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(r, g, b));
+
+ WRITE_TWO_PIXELS(outptr0, rgb);
+ outptr0 += 4;
+
+ y = GETJSAMPLE(*inptr01++);
+ r = range_limit[y + cred];
+ g = range_limit[y + cgreen];
+ b = range_limit[y + cblue];
+ rgb = PACK_SHORT_565(r, g, b);
+
+ y = GETJSAMPLE(*inptr01++);
+ r = range_limit[y + cred];
+ g = range_limit[y + cgreen];
+ b = range_limit[y + cblue];
+ rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(r, g, b));
+
+ WRITE_TWO_PIXELS(outptr1, rgb);
+ outptr1 += 4;
+ }
+
+ /* If image width is odd, do the last output column separately */
+ if (cinfo->output_width & 1) {
+ cb = GETJSAMPLE(*inptr1);
+ cr = GETJSAMPLE(*inptr2);
+ cred = Crrtab[cr];
+ cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS);
+ cblue = Cbbtab[cb];
+
+ y = GETJSAMPLE(*inptr00);
+ r = range_limit[y + cred];
+ g = range_limit[y + cgreen];
+ b = range_limit[y + cblue];
+ rgb = PACK_SHORT_565(r, g, b);
+ *(INT16*)outptr0 = rgb;
+
+ y = GETJSAMPLE(*inptr01);
+ r = range_limit[y + cred];
+ g = range_limit[y + cgreen];
+ b = range_limit[y + cblue];
+ rgb = PACK_SHORT_565(r, g, b);
+ *(INT16*)outptr1 = rgb;
+ }
+}
+
+
+INLINE
+LOCAL(void)
+h2v2_merged_upsample_565D_internal (j_decompress_ptr cinfo,
+ JSAMPIMAGE input_buf,
+ JDIMENSION in_row_group_ctr,
+ JSAMPARRAY output_buf)
+{
+ my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
+ register int y, cred, cgreen, cblue;
+ int cb, cr;
+ register JSAMPROW outptr0, outptr1;
+ JSAMPROW inptr00, inptr01, inptr1, inptr2;
+ JDIMENSION col;
+ /* copy these pointers into registers if possible */
+ register JSAMPLE * range_limit = cinfo->sample_range_limit;
+ int * Crrtab = upsample->Cr_r_tab;
+ int * Cbbtab = upsample->Cb_b_tab;
+ INT32 * Crgtab = upsample->Cr_g_tab;
+ INT32 * Cbgtab = upsample->Cb_g_tab;
+ INT32 d0 = dither_matrix[cinfo->output_scanline & DITHER_MASK];
+ INT32 d1 = dither_matrix[(cinfo->output_scanline+1) & DITHER_MASK];
+ unsigned int r, g, b;
+ INT32 rgb;
+ SHIFT_TEMPS
+
+ inptr00 = input_buf[0][in_row_group_ctr*2];
+ inptr01 = input_buf[0][in_row_group_ctr*2 + 1];
+ inptr1 = input_buf[1][in_row_group_ctr];
+ inptr2 = input_buf[2][in_row_group_ctr];
+ outptr0 = output_buf[0];
+ outptr1 = output_buf[1];
+
+ /* Loop for each group of output pixels */
+ for (col = cinfo->output_width >> 1; col > 0; col--) {
+ /* Do the chroma part of the calculation */
+ cb = GETJSAMPLE(*inptr1++);
+ cr = GETJSAMPLE(*inptr2++);
+ cred = Crrtab[cr];
+ cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS);
+ cblue = Cbbtab[cb];
+
+ /* Fetch 4 Y values and emit 4 pixels */
+ y = GETJSAMPLE(*inptr00++);
+ r = range_limit[DITHER_565_R(y + cred, d0)];
+ g = range_limit[DITHER_565_G(y + cgreen, d0)];
+ b = range_limit[DITHER_565_B(y + cblue, d0)];
+ d0 = DITHER_ROTATE(d0);
+ rgb = PACK_SHORT_565(r, g, b);
+
+ y = GETJSAMPLE(*inptr00++);
+ r = range_limit[DITHER_565_R(y + cred, d1)];
+ g = range_limit[DITHER_565_G(y + cgreen, d1)];
+ b = range_limit[DITHER_565_B(y + cblue, d1)];
+ d1 = DITHER_ROTATE(d1);
+ rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(r, g, b));
+
+ WRITE_TWO_PIXELS(outptr0, rgb);
+ outptr0 += 4;
+
+ y = GETJSAMPLE(*inptr01++);
+ r = range_limit[DITHER_565_R(y + cred, d0)];
+ g = range_limit[DITHER_565_G(y + cgreen, d0)];
+ b = range_limit[DITHER_565_B(y + cblue, d0)];
+ d0 = DITHER_ROTATE(d0);
+ rgb = PACK_SHORT_565(r, g, b);
+
+ y = GETJSAMPLE(*inptr01++);
+ r = range_limit[DITHER_565_R(y + cred, d1)];
+ g = range_limit[DITHER_565_G(y + cgreen, d1)];
+ b = range_limit[DITHER_565_B(y + cblue, d1)];
+ d1 = DITHER_ROTATE(d1);
+ rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(r, g, b));
+
+ WRITE_TWO_PIXELS(outptr1, rgb);
+ outptr1 += 4;
+ }
+
+ /* If image width is odd, do the last output column separately */
+ if (cinfo->output_width & 1) {
+ cb = GETJSAMPLE(*inptr1);
+ cr = GETJSAMPLE(*inptr2);
+ cred = Crrtab[cr];
+ cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS);
+ cblue = Cbbtab[cb];
+
+ y = GETJSAMPLE(*inptr00);
+ r = range_limit[DITHER_565_R(y + cred, d0)];
+ g = range_limit[DITHER_565_G(y + cgreen, d0)];
+ b = range_limit[DITHER_565_B(y + cblue, d0)];
+ rgb = PACK_SHORT_565(r, g, b);
+ *(INT16*)outptr0 = rgb;
+
+ y = GETJSAMPLE(*inptr01);
+ r = range_limit[DITHER_565_R(y + cred, d1)];
+ g = range_limit[DITHER_565_G(y + cgreen, d1)];
+ b = range_limit[DITHER_565_B(y + cblue, d1)];
+ rgb = PACK_SHORT_565(r, g, b);
+ *(INT16*)outptr1 = rgb;
+ }
+}
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