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Unified Diff: jdcol565.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: jdcol565.c
diff --git a/jdcol565.c b/jdcol565.c
new file mode 100644
index 0000000000000000000000000000000000000000..695f2621e3febf2d5225361688e976b4e01a6662
--- /dev/null
+++ b/jdcol565.c
@@ -0,0 +1,383 @@
+/*
+ * jdcol565.c
+ *
+ * This file was part of the Independent JPEG Group's software:
+ * Copyright (C) 1991-1997, Thomas G. Lane.
+ * 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 output colorspace conversion routines.
+ */
+
+/* This file is included by jdcolor.c */
+
+
+INLINE
+LOCAL(void)
+ycc_rgb565_convert_internal (j_decompress_ptr cinfo,
+ JSAMPIMAGE input_buf, JDIMENSION input_row,
+ JSAMPARRAY output_buf, int num_rows)
+{
+ my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
+ register int y, cb, cr;
+ register JSAMPROW outptr;
+ register JSAMPROW inptr0, inptr1, inptr2;
+ register JDIMENSION col;
+ JDIMENSION num_cols = cinfo->output_width;
+ /* copy these pointers into registers if possible */
+ register JSAMPLE * range_limit = cinfo->sample_range_limit;
+ register int * Crrtab = cconvert->Cr_r_tab;
+ register int * Cbbtab = cconvert->Cb_b_tab;
+ register INT32 * Crgtab = cconvert->Cr_g_tab;
+ register INT32 * Cbgtab = cconvert->Cb_g_tab;
+ SHIFT_TEMPS
+
+ while (--num_rows >= 0) {
+ INT32 rgb;
+ unsigned int r, g, b;
+ inptr0 = input_buf[0][input_row];
+ inptr1 = input_buf[1][input_row];
+ inptr2 = input_buf[2][input_row];
+ input_row++;
+ outptr = *output_buf++;
+
+ if (PACK_NEED_ALIGNMENT(outptr)) {
+ y = GETJSAMPLE(*inptr0++);
+ cb = GETJSAMPLE(*inptr1++);
+ cr = GETJSAMPLE(*inptr2++);
+ r = range_limit[y + Crrtab[cr]];
+ g = range_limit[y + ((int)RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr],
+ SCALEBITS))];
+ b = range_limit[y + Cbbtab[cb]];
+ rgb = PACK_SHORT_565(r, g, b);
+ *(INT16*)outptr = rgb;
+ outptr += 2;
+ num_cols--;
+ }
+ for (col = 0; col < (num_cols >> 1); col++) {
+ y = GETJSAMPLE(*inptr0++);
+ cb = GETJSAMPLE(*inptr1++);
+ cr = GETJSAMPLE(*inptr2++);
+ r = range_limit[y + Crrtab[cr]];
+ g = range_limit[y + ((int)RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr],
+ SCALEBITS))];
+ b = range_limit[y + Cbbtab[cb]];
+ rgb = PACK_SHORT_565(r, g, b);
+
+ y = GETJSAMPLE(*inptr0++);
+ cb = GETJSAMPLE(*inptr1++);
+ cr = GETJSAMPLE(*inptr2++);
+ r = range_limit[y + Crrtab[cr]];
+ g = range_limit[y + ((int)RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr],
+ SCALEBITS))];
+ b = range_limit[y + Cbbtab[cb]];
+ rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(r, g, b));
+
+ WRITE_TWO_ALIGNED_PIXELS(outptr, rgb);
+ outptr += 4;
+ }
+ if (num_cols & 1) {
+ y = GETJSAMPLE(*inptr0);
+ cb = GETJSAMPLE(*inptr1);
+ cr = GETJSAMPLE(*inptr2);
+ r = range_limit[y + Crrtab[cr]];
+ g = range_limit[y + ((int)RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr],
+ SCALEBITS))];
+ b = range_limit[y + Cbbtab[cb]];
+ rgb = PACK_SHORT_565(r, g, b);
+ *(INT16*)outptr = rgb;
+ }
+ }
+}
+
+
+INLINE
+LOCAL(void)
+ycc_rgb565D_convert_internal (j_decompress_ptr cinfo,
+ JSAMPIMAGE input_buf, JDIMENSION input_row,
+ JSAMPARRAY output_buf, int num_rows)
+{
+ my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
+ register int y, cb, cr;
+ register JSAMPROW outptr;
+ register JSAMPROW inptr0, inptr1, inptr2;
+ register JDIMENSION col;
+ JDIMENSION num_cols = cinfo->output_width;
+ /* copy these pointers into registers if possible */
+ register JSAMPLE * range_limit = cinfo->sample_range_limit;
+ register int * Crrtab = cconvert->Cr_r_tab;
+ register int * Cbbtab = cconvert->Cb_b_tab;
+ register INT32 * Crgtab = cconvert->Cr_g_tab;
+ register INT32 * Cbgtab = cconvert->Cb_g_tab;
+ INT32 d0 = dither_matrix[cinfo->output_scanline & DITHER_MASK];
+ SHIFT_TEMPS
+
+ while (--num_rows >= 0) {
+ INT32 rgb;
+ unsigned int r, g, b;
+
+ inptr0 = input_buf[0][input_row];
+ inptr1 = input_buf[1][input_row];
+ inptr2 = input_buf[2][input_row];
+ input_row++;
+ outptr = *output_buf++;
+ if (PACK_NEED_ALIGNMENT(outptr)) {
+ y = GETJSAMPLE(*inptr0++);
+ cb = GETJSAMPLE(*inptr1++);
+ cr = GETJSAMPLE(*inptr2++);
+ r = range_limit[DITHER_565_R(y + Crrtab[cr], d0)];
+ g = range_limit[DITHER_565_G(y +
+ ((int)RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr],
+ SCALEBITS)), d0)];
+ b = range_limit[DITHER_565_B(y + Cbbtab[cb], d0)];
+ rgb = PACK_SHORT_565(r, g, b);
+ *(INT16*)outptr = rgb;
+ outptr += 2;
+ num_cols--;
+ }
+ for (col = 0; col < (num_cols >> 1); col++) {
+ y = GETJSAMPLE(*inptr0++);
+ cb = GETJSAMPLE(*inptr1++);
+ cr = GETJSAMPLE(*inptr2++);
+ r = range_limit[DITHER_565_R(y + Crrtab[cr], d0)];
+ g = range_limit[DITHER_565_G(y +
+ ((int)RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr],
+ SCALEBITS)), d0)];
+ b = range_limit[DITHER_565_B(y + Cbbtab[cb], d0)];
+ d0 = DITHER_ROTATE(d0);
+ rgb = PACK_SHORT_565(r, g, b);
+
+ y = GETJSAMPLE(*inptr0++);
+ cb = GETJSAMPLE(*inptr1++);
+ cr = GETJSAMPLE(*inptr2++);
+ r = range_limit[DITHER_565_R(y + Crrtab[cr], d0)];
+ g = range_limit[DITHER_565_G(y +
+ ((int)RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr],
+ SCALEBITS)), d0)];
+ b = range_limit[DITHER_565_B(y + Cbbtab[cb], d0)];
+ d0 = DITHER_ROTATE(d0);
+ rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(r, g, b));
+
+ WRITE_TWO_ALIGNED_PIXELS(outptr, rgb);
+ outptr += 4;
+ }
+ if (num_cols & 1) {
+ y = GETJSAMPLE(*inptr0);
+ cb = GETJSAMPLE(*inptr1);
+ cr = GETJSAMPLE(*inptr2);
+ r = range_limit[DITHER_565_R(y + Crrtab[cr], d0)];
+ g = range_limit[DITHER_565_G(y +
+ ((int)RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr],
+ SCALEBITS)), d0)];
+ b = range_limit[DITHER_565_B(y + Cbbtab[cb], d0)];
+ rgb = PACK_SHORT_565(r, g, b);
+ *(INT16*)outptr = rgb;
+ }
+ }
+}
+
+
+INLINE
+LOCAL(void)
+rgb_rgb565_convert_internal (j_decompress_ptr cinfo,
+ JSAMPIMAGE input_buf, JDIMENSION input_row,
+ JSAMPARRAY output_buf, int num_rows)
+{
+ register JSAMPROW outptr;
+ register JSAMPROW inptr0, inptr1, inptr2;
+ register JDIMENSION col;
+ JDIMENSION num_cols = cinfo->output_width;
+ SHIFT_TEMPS
+
+ while (--num_rows >= 0) {
+ INT32 rgb;
+ unsigned int r, g, b;
+
+ inptr0 = input_buf[0][input_row];
+ inptr1 = input_buf[1][input_row];
+ inptr2 = input_buf[2][input_row];
+ input_row++;
+ outptr = *output_buf++;
+ if (PACK_NEED_ALIGNMENT(outptr)) {
+ r = GETJSAMPLE(*inptr0++);
+ g = GETJSAMPLE(*inptr1++);
+ b = GETJSAMPLE(*inptr2++);
+ rgb = PACK_SHORT_565(r, g, b);
+ *(INT16*)outptr = rgb;
+ outptr += 2;
+ num_cols--;
+ }
+ for (col = 0; col < (num_cols >> 1); col++) {
+ r = GETJSAMPLE(*inptr0++);
+ g = GETJSAMPLE(*inptr1++);
+ b = GETJSAMPLE(*inptr2++);
+ rgb = PACK_SHORT_565(r, g, b);
+
+ r = GETJSAMPLE(*inptr0++);
+ g = GETJSAMPLE(*inptr1++);
+ b = GETJSAMPLE(*inptr2++);
+ rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(r, g, b));
+
+ WRITE_TWO_ALIGNED_PIXELS(outptr, rgb);
+ outptr += 4;
+ }
+ if (num_cols & 1) {
+ r = GETJSAMPLE(*inptr0);
+ g = GETJSAMPLE(*inptr1);
+ b = GETJSAMPLE(*inptr2);
+ rgb = PACK_SHORT_565(r, g, b);
+ *(INT16*)outptr = rgb;
+ }
+ }
+}
+
+
+INLINE
+LOCAL(void)
+rgb_rgb565D_convert_internal (j_decompress_ptr cinfo,
+ JSAMPIMAGE input_buf, JDIMENSION input_row,
+ JSAMPARRAY output_buf, int num_rows)
+{
+ register JSAMPROW outptr;
+ register JSAMPROW inptr0, inptr1, inptr2;
+ register JDIMENSION col;
+ register JSAMPLE * range_limit = cinfo->sample_range_limit;
+ JDIMENSION num_cols = cinfo->output_width;
+ INT32 d0 = dither_matrix[cinfo->output_scanline & DITHER_MASK];
+ SHIFT_TEMPS
+
+ while (--num_rows >= 0) {
+ INT32 rgb;
+ unsigned int r, g, b;
+
+ inptr0 = input_buf[0][input_row];
+ inptr1 = input_buf[1][input_row];
+ inptr2 = input_buf[2][input_row];
+ input_row++;
+ outptr = *output_buf++;
+ if (PACK_NEED_ALIGNMENT(outptr)) {
+ r = range_limit[DITHER_565_R(GETJSAMPLE(*inptr0++), d0)];
+ g = range_limit[DITHER_565_G(GETJSAMPLE(*inptr1++), d0)];
+ b = range_limit[DITHER_565_B(GETJSAMPLE(*inptr2++), d0)];
+ rgb = PACK_SHORT_565(r, g, b);
+ *(INT16*)outptr = rgb;
+ outptr += 2;
+ num_cols--;
+ }
+ for (col = 0; col < (num_cols >> 1); col++) {
+ r = range_limit[DITHER_565_R(GETJSAMPLE(*inptr0++), d0)];
+ g = range_limit[DITHER_565_G(GETJSAMPLE(*inptr1++), d0)];
+ b = range_limit[DITHER_565_B(GETJSAMPLE(*inptr2++), d0)];
+ d0 = DITHER_ROTATE(d0);
+ rgb = PACK_SHORT_565(r, g, b);
+
+ r = range_limit[DITHER_565_R(GETJSAMPLE(*inptr0++), d0)];
+ g = range_limit[DITHER_565_G(GETJSAMPLE(*inptr1++), d0)];
+ b = range_limit[DITHER_565_B(GETJSAMPLE(*inptr2++), d0)];
+ d0 = DITHER_ROTATE(d0);
+ rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(r, g, b));
+
+ WRITE_TWO_ALIGNED_PIXELS(outptr, rgb);
+ outptr += 4;
+ }
+ if (num_cols & 1) {
+ r = range_limit[DITHER_565_R(GETJSAMPLE(*inptr0), d0)];
+ g = range_limit[DITHER_565_G(GETJSAMPLE(*inptr1), d0)];
+ b = range_limit[DITHER_565_B(GETJSAMPLE(*inptr2), d0)];
+ rgb = PACK_SHORT_565(r, g, b);
+ *(INT16*)outptr = rgb;
+ }
+ }
+}
+
+
+INLINE
+LOCAL(void)
+gray_rgb565_convert_internal (j_decompress_ptr cinfo,
+ JSAMPIMAGE input_buf, JDIMENSION input_row,
+ JSAMPARRAY output_buf, int num_rows)
+{
+ register JSAMPROW inptr, outptr;
+ register JDIMENSION col;
+ JDIMENSION num_cols = cinfo->output_width;
+
+ while (--num_rows >= 0) {
+ INT32 rgb;
+ unsigned int g;
+
+ inptr = input_buf[0][input_row++];
+ outptr = *output_buf++;
+ if (PACK_NEED_ALIGNMENT(outptr)) {
+ g = *inptr++;
+ rgb = PACK_SHORT_565(g, g, g);
+ *(INT16*)outptr = rgb;
+ outptr += 2;
+ num_cols--;
+ }
+ for (col = 0; col < (num_cols >> 1); col++) {
+ g = *inptr++;
+ rgb = PACK_SHORT_565(g, g, g);
+ g = *inptr++;
+ rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(g, g, g));
+ WRITE_TWO_ALIGNED_PIXELS(outptr, rgb);
+ outptr += 4;
+ }
+ if (num_cols & 1) {
+ g = *inptr;
+ rgb = PACK_SHORT_565(g, g, g);
+ *(INT16*)outptr = rgb;
+ }
+ }
+}
+
+
+INLINE
+LOCAL(void)
+gray_rgb565D_convert_internal (j_decompress_ptr cinfo,
+ JSAMPIMAGE input_buf, JDIMENSION input_row,
+ JSAMPARRAY output_buf, int num_rows)
+{
+ register JSAMPROW inptr, outptr;
+ register JDIMENSION col;
+ register JSAMPLE * range_limit = cinfo->sample_range_limit;
+ JDIMENSION num_cols = cinfo->output_width;
+ INT32 d0 = dither_matrix[cinfo->output_scanline & DITHER_MASK];
+
+ while (--num_rows >= 0) {
+ INT32 rgb;
+ unsigned int g;
+
+ inptr = input_buf[0][input_row++];
+ outptr = *output_buf++;
+ if (PACK_NEED_ALIGNMENT(outptr)) {
+ g = *inptr++;
+ g = range_limit[DITHER_565_R(g, d0)];
+ rgb = PACK_SHORT_565(g, g, g);
+ *(INT16*)outptr = rgb;
+ outptr += 2;
+ num_cols--;
+ }
+ for (col = 0; col < (num_cols >> 1); col++) {
+ g = *inptr++;
+ g = range_limit[DITHER_565_R(g, d0)];
+ rgb = PACK_SHORT_565(g, g, g);
+ d0 = DITHER_ROTATE(d0);
+
+ g = *inptr++;
+ g = range_limit[DITHER_565_R(g, d0)];
+ rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(g, g, g));
+ d0 = DITHER_ROTATE(d0);
+
+ WRITE_TWO_ALIGNED_PIXELS(outptr, rgb);
+ outptr += 4;
+ }
+ if (num_cols & 1) {
+ g = *inptr;
+ g = range_limit[DITHER_565_R(g, d0)];
+ rgb = PACK_SHORT_565(g, g, g);
+ *(INT16*)outptr = rgb;
+ }
+ }
+}
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