1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/libjpeg/jccolext.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,147 @@
1.4 +/*
1.5 + * jccolext.c
1.6 + *
1.7 + * This file was part of the Independent JPEG Group's software:
1.8 + * Copyright (C) 1991-1996, Thomas G. Lane.
1.9 + * libjpeg-turbo Modifications:
1.10 + * Copyright (C) 2009-2012, D. R. Commander.
1.11 + * For conditions of distribution and use, see the accompanying README file.
1.12 + *
1.13 + * This file contains input colorspace conversion routines.
1.14 + */
1.15 +
1.16 +
1.17 +/* This file is included by jccolor.c */
1.18 +
1.19 +
1.20 +/*
1.21 + * Convert some rows of samples to the JPEG colorspace.
1.22 + *
1.23 + * Note that we change from the application's interleaved-pixel format
1.24 + * to our internal noninterleaved, one-plane-per-component format.
1.25 + * The input buffer is therefore three times as wide as the output buffer.
1.26 + *
1.27 + * A starting row offset is provided only for the output buffer. The caller
1.28 + * can easily adjust the passed input_buf value to accommodate any row
1.29 + * offset required on that side.
1.30 + */
1.31 +
1.32 +INLINE
1.33 +LOCAL(void)
1.34 +rgb_ycc_convert_internal (j_compress_ptr cinfo,
1.35 + JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
1.36 + JDIMENSION output_row, int num_rows)
1.37 +{
1.38 + my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
1.39 + register int r, g, b;
1.40 + register INT32 * ctab = cconvert->rgb_ycc_tab;
1.41 + register JSAMPROW inptr;
1.42 + register JSAMPROW outptr0, outptr1, outptr2;
1.43 + register JDIMENSION col;
1.44 + JDIMENSION num_cols = cinfo->image_width;
1.45 +
1.46 + while (--num_rows >= 0) {
1.47 + inptr = *input_buf++;
1.48 + outptr0 = output_buf[0][output_row];
1.49 + outptr1 = output_buf[1][output_row];
1.50 + outptr2 = output_buf[2][output_row];
1.51 + output_row++;
1.52 + for (col = 0; col < num_cols; col++) {
1.53 + r = GETJSAMPLE(inptr[RGB_RED]);
1.54 + g = GETJSAMPLE(inptr[RGB_GREEN]);
1.55 + b = GETJSAMPLE(inptr[RGB_BLUE]);
1.56 + inptr += RGB_PIXELSIZE;
1.57 + /* If the inputs are 0..MAXJSAMPLE, the outputs of these equations
1.58 + * must be too; we do not need an explicit range-limiting operation.
1.59 + * Hence the value being shifted is never negative, and we don't
1.60 + * need the general RIGHT_SHIFT macro.
1.61 + */
1.62 + /* Y */
1.63 + outptr0[col] = (JSAMPLE)
1.64 + ((ctab[r+R_Y_OFF] + ctab[g+G_Y_OFF] + ctab[b+B_Y_OFF])
1.65 + >> SCALEBITS);
1.66 + /* Cb */
1.67 + outptr1[col] = (JSAMPLE)
1.68 + ((ctab[r+R_CB_OFF] + ctab[g+G_CB_OFF] + ctab[b+B_CB_OFF])
1.69 + >> SCALEBITS);
1.70 + /* Cr */
1.71 + outptr2[col] = (JSAMPLE)
1.72 + ((ctab[r+R_CR_OFF] + ctab[g+G_CR_OFF] + ctab[b+B_CR_OFF])
1.73 + >> SCALEBITS);
1.74 + }
1.75 + }
1.76 +}
1.77 +
1.78 +
1.79 +/**************** Cases other than RGB -> YCbCr **************/
1.80 +
1.81 +
1.82 +/*
1.83 + * Convert some rows of samples to the JPEG colorspace.
1.84 + * This version handles RGB->grayscale conversion, which is the same
1.85 + * as the RGB->Y portion of RGB->YCbCr.
1.86 + * We assume rgb_ycc_start has been called (we only use the Y tables).
1.87 + */
1.88 +
1.89 +INLINE
1.90 +LOCAL(void)
1.91 +rgb_gray_convert_internal (j_compress_ptr cinfo,
1.92 + JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
1.93 + JDIMENSION output_row, int num_rows)
1.94 +{
1.95 + my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
1.96 + register int r, g, b;
1.97 + register INT32 * ctab = cconvert->rgb_ycc_tab;
1.98 + register JSAMPROW inptr;
1.99 + register JSAMPROW outptr;
1.100 + register JDIMENSION col;
1.101 + JDIMENSION num_cols = cinfo->image_width;
1.102 +
1.103 + while (--num_rows >= 0) {
1.104 + inptr = *input_buf++;
1.105 + outptr = output_buf[0][output_row];
1.106 + output_row++;
1.107 + for (col = 0; col < num_cols; col++) {
1.108 + r = GETJSAMPLE(inptr[RGB_RED]);
1.109 + g = GETJSAMPLE(inptr[RGB_GREEN]);
1.110 + b = GETJSAMPLE(inptr[RGB_BLUE]);
1.111 + inptr += RGB_PIXELSIZE;
1.112 + /* Y */
1.113 + outptr[col] = (JSAMPLE)
1.114 + ((ctab[r+R_Y_OFF] + ctab[g+G_Y_OFF] + ctab[b+B_Y_OFF])
1.115 + >> SCALEBITS);
1.116 + }
1.117 + }
1.118 +}
1.119 +
1.120 +
1.121 +/*
1.122 + * Convert some rows of samples to the JPEG colorspace.
1.123 + * This version handles extended RGB->plain RGB conversion
1.124 + */
1.125 +
1.126 +INLINE
1.127 +LOCAL(void)
1.128 +rgb_rgb_convert_internal (j_compress_ptr cinfo,
1.129 + JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
1.130 + JDIMENSION output_row, int num_rows)
1.131 +{
1.132 + register JSAMPROW inptr;
1.133 + register JSAMPROW outptr0, outptr1, outptr2;
1.134 + register JDIMENSION col;
1.135 + JDIMENSION num_cols = cinfo->image_width;
1.136 +
1.137 + while (--num_rows >= 0) {
1.138 + inptr = *input_buf++;
1.139 + outptr0 = output_buf[0][output_row];
1.140 + outptr1 = output_buf[1][output_row];
1.141 + outptr2 = output_buf[2][output_row];
1.142 + output_row++;
1.143 + for (col = 0; col < num_cols; col++) {
1.144 + outptr0[col] = GETJSAMPLE(inptr[RGB_RED]);
1.145 + outptr1[col] = GETJSAMPLE(inptr[RGB_GREEN]);
1.146 + outptr2[col] = GETJSAMPLE(inptr[RGB_BLUE]);
1.147 + inptr += RGB_PIXELSIZE;
1.148 + }
1.149 + }
1.150 +}
