summaryrefslogtreecommitdiffstats
path: root/media/libjpeg/jdmrgext.c
diff options
context:
space:
mode:
Diffstat (limited to 'media/libjpeg/jdmrgext.c')
-rw-r--r--media/libjpeg/jdmrgext.c184
1 files changed, 184 insertions, 0 deletions
diff --git a/media/libjpeg/jdmrgext.c b/media/libjpeg/jdmrgext.c
new file mode 100644
index 0000000000..9bf4f1a307
--- /dev/null
+++ b/media/libjpeg/jdmrgext.c
@@ -0,0 +1,184 @@
+/*
+ * jdmrgext.c
+ *
+ * This file was part of the Independent JPEG Group's software:
+ * Copyright (C) 1994-1996, Thomas G. Lane.
+ * libjpeg-turbo Modifications:
+ * Copyright (C) 2011, 2015, 2020, D. R. Commander.
+ * For conditions of distribution and use, see the accompanying README.ijg
+ * file.
+ *
+ * This file contains code for merged upsampling/color conversion.
+ */
+
+
+/* This file is included by jdmerge.c */
+
+
+/*
+ * Upsample and color convert for the case of 2:1 horizontal and 1:1 vertical.
+ */
+
+INLINE
+LOCAL(void)
+h2v1_merged_upsample_internal(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
+ JDIMENSION in_row_group_ctr,
+ JSAMPARRAY output_buf)
+{
+ my_merged_upsample_ptr upsample = (my_merged_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;
+ JLONG *Crgtab = upsample->Cr_g_tab;
+ JLONG *Cbgtab = upsample->Cb_g_tab;
+ 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 = *inptr1++;
+ cr = *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 = *inptr0++;
+ outptr[RGB_RED] = range_limit[y + cred];
+ outptr[RGB_GREEN] = range_limit[y + cgreen];
+ outptr[RGB_BLUE] = range_limit[y + cblue];
+#ifdef RGB_ALPHA
+ outptr[RGB_ALPHA] = 0xFF;
+#endif
+ outptr += RGB_PIXELSIZE;
+ y = *inptr0++;
+ outptr[RGB_RED] = range_limit[y + cred];
+ outptr[RGB_GREEN] = range_limit[y + cgreen];
+ outptr[RGB_BLUE] = range_limit[y + cblue];
+#ifdef RGB_ALPHA
+ outptr[RGB_ALPHA] = 0xFF;
+#endif
+ outptr += RGB_PIXELSIZE;
+ }
+ /* If image width is odd, do the last output column separately */
+ if (cinfo->output_width & 1) {
+ cb = *inptr1;
+ cr = *inptr2;
+ cred = Crrtab[cr];
+ cgreen = (int)RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS);
+ cblue = Cbbtab[cb];
+ y = *inptr0;
+ outptr[RGB_RED] = range_limit[y + cred];
+ outptr[RGB_GREEN] = range_limit[y + cgreen];
+ outptr[RGB_BLUE] = range_limit[y + cblue];
+#ifdef RGB_ALPHA
+ outptr[RGB_ALPHA] = 0xFF;
+#endif
+ }
+}
+
+
+/*
+ * Upsample and color convert for the case of 2:1 horizontal and 2:1 vertical.
+ */
+
+INLINE
+LOCAL(void)
+h2v2_merged_upsample_internal(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
+ JDIMENSION in_row_group_ctr,
+ JSAMPARRAY output_buf)
+{
+ my_merged_upsample_ptr upsample = (my_merged_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;
+ JLONG *Crgtab = upsample->Cr_g_tab;
+ JLONG *Cbgtab = upsample->Cb_g_tab;
+ 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 = *inptr1++;
+ cr = *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 = *inptr00++;
+ outptr0[RGB_RED] = range_limit[y + cred];
+ outptr0[RGB_GREEN] = range_limit[y + cgreen];
+ outptr0[RGB_BLUE] = range_limit[y + cblue];
+#ifdef RGB_ALPHA
+ outptr0[RGB_ALPHA] = 0xFF;
+#endif
+ outptr0 += RGB_PIXELSIZE;
+ y = *inptr00++;
+ outptr0[RGB_RED] = range_limit[y + cred];
+ outptr0[RGB_GREEN] = range_limit[y + cgreen];
+ outptr0[RGB_BLUE] = range_limit[y + cblue];
+#ifdef RGB_ALPHA
+ outptr0[RGB_ALPHA] = 0xFF;
+#endif
+ outptr0 += RGB_PIXELSIZE;
+ y = *inptr01++;
+ outptr1[RGB_RED] = range_limit[y + cred];
+ outptr1[RGB_GREEN] = range_limit[y + cgreen];
+ outptr1[RGB_BLUE] = range_limit[y + cblue];
+#ifdef RGB_ALPHA
+ outptr1[RGB_ALPHA] = 0xFF;
+#endif
+ outptr1 += RGB_PIXELSIZE;
+ y = *inptr01++;
+ outptr1[RGB_RED] = range_limit[y + cred];
+ outptr1[RGB_GREEN] = range_limit[y + cgreen];
+ outptr1[RGB_BLUE] = range_limit[y + cblue];
+#ifdef RGB_ALPHA
+ outptr1[RGB_ALPHA] = 0xFF;
+#endif
+ outptr1 += RGB_PIXELSIZE;
+ }
+ /* If image width is odd, do the last output column separately */
+ if (cinfo->output_width & 1) {
+ cb = *inptr1;
+ cr = *inptr2;
+ cred = Crrtab[cr];
+ cgreen = (int)RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS);
+ cblue = Cbbtab[cb];
+ y = *inptr00;
+ outptr0[RGB_RED] = range_limit[y + cred];
+ outptr0[RGB_GREEN] = range_limit[y + cgreen];
+ outptr0[RGB_BLUE] = range_limit[y + cblue];
+#ifdef RGB_ALPHA
+ outptr0[RGB_ALPHA] = 0xFF;
+#endif
+ y = *inptr01;
+ outptr1[RGB_RED] = range_limit[y + cred];
+ outptr1[RGB_GREEN] = range_limit[y + cgreen];
+ outptr1[RGB_BLUE] = range_limit[y + cblue];
+#ifdef RGB_ALPHA
+ outptr1[RGB_ALPHA] = 0xFF;
+#endif
+ }
+}