1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/libjpeg/jdcolext.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,142 @@
1.4 +/*
1.5 + * jdcolext.c
1.6 + *
1.7 + * This file was part of the Independent JPEG Group's software:
1.8 + * Copyright (C) 1991-1997, Thomas G. Lane.
1.9 + * libjpeg-turbo Modifications:
1.10 + * Copyright (C) 2009, 2011, D. R. Commander.
1.11 + * For conditions of distribution and use, see the accompanying README file.
1.12 + *
1.13 + * This file contains output colorspace conversion routines.
1.14 + */
1.15 +
1.16 +
1.17 +/* This file is included by jdcolor.c */
1.18 +
1.19 +
1.20 +/*
1.21 + * Convert some rows of samples to the output colorspace.
1.22 + *
1.23 + * Note that we change from noninterleaved, one-plane-per-component format
1.24 + * to interleaved-pixel format. The output buffer is therefore three times
1.25 + * as wide as the input buffer.
1.26 + * A starting row offset is provided only for the input buffer. The caller
1.27 + * can easily adjust the passed output_buf value to accommodate any row
1.28 + * offset required on that side.
1.29 + */
1.30 +
1.31 +INLINE
1.32 +LOCAL(void)
1.33 +ycc_rgb_convert_internal (j_decompress_ptr cinfo,
1.34 + JSAMPIMAGE input_buf, JDIMENSION input_row,
1.35 + JSAMPARRAY output_buf, int num_rows)
1.36 +{
1.37 + my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
1.38 + register int y, cb, cr;
1.39 + register JSAMPROW outptr;
1.40 + register JSAMPROW inptr0, inptr1, inptr2;
1.41 + register JDIMENSION col;
1.42 + JDIMENSION num_cols = cinfo->output_width;
1.43 + /* copy these pointers into registers if possible */
1.44 + register JSAMPLE * range_limit = cinfo->sample_range_limit;
1.45 + register int * Crrtab = cconvert->Cr_r_tab;
1.46 + register int * Cbbtab = cconvert->Cb_b_tab;
1.47 + register INT32 * Crgtab = cconvert->Cr_g_tab;
1.48 + register INT32 * Cbgtab = cconvert->Cb_g_tab;
1.49 + SHIFT_TEMPS
1.50 +
1.51 + while (--num_rows >= 0) {
1.52 + inptr0 = input_buf[0][input_row];
1.53 + inptr1 = input_buf[1][input_row];
1.54 + inptr2 = input_buf[2][input_row];
1.55 + input_row++;
1.56 + outptr = *output_buf++;
1.57 + for (col = 0; col < num_cols; col++) {
1.58 + y = GETJSAMPLE(inptr0[col]);
1.59 + cb = GETJSAMPLE(inptr1[col]);
1.60 + cr = GETJSAMPLE(inptr2[col]);
1.61 + /* Range-limiting is essential due to noise introduced by DCT losses. */
1.62 + outptr[RGB_RED] = range_limit[y + Crrtab[cr]];
1.63 + outptr[RGB_GREEN] = range_limit[y +
1.64 + ((int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr],
1.65 + SCALEBITS))];
1.66 + outptr[RGB_BLUE] = range_limit[y + Cbbtab[cb]];
1.67 + /* Set unused byte to 0xFF so it can be interpreted as an opaque */
1.68 + /* alpha channel value */
1.69 +#ifdef RGB_ALPHA
1.70 + outptr[RGB_ALPHA] = 0xFF;
1.71 +#endif
1.72 + outptr += RGB_PIXELSIZE;
1.73 + }
1.74 + }
1.75 +}
1.76 +
1.77 +
1.78 +/*
1.79 + * Convert grayscale to RGB: just duplicate the graylevel three times.
1.80 + * This is provided to support applications that don't want to cope
1.81 + * with grayscale as a separate case.
1.82 + */
1.83 +
1.84 +INLINE
1.85 +LOCAL(void)
1.86 +gray_rgb_convert_internal (j_decompress_ptr cinfo,
1.87 + JSAMPIMAGE input_buf, JDIMENSION input_row,
1.88 + JSAMPARRAY output_buf, int num_rows)
1.89 +{
1.90 + register JSAMPROW inptr, outptr;
1.91 + register JDIMENSION col;
1.92 + JDIMENSION num_cols = cinfo->output_width;
1.93 +
1.94 + while (--num_rows >= 0) {
1.95 + inptr = input_buf[0][input_row++];
1.96 + outptr = *output_buf++;
1.97 + for (col = 0; col < num_cols; col++) {
1.98 + /* We can dispense with GETJSAMPLE() here */
1.99 + outptr[RGB_RED] = outptr[RGB_GREEN] = outptr[RGB_BLUE] = inptr[col];
1.100 + /* Set unused byte to 0xFF so it can be interpreted as an opaque */
1.101 + /* alpha channel value */
1.102 +#ifdef RGB_ALPHA
1.103 + outptr[RGB_ALPHA] = 0xFF;
1.104 +#endif
1.105 + outptr += RGB_PIXELSIZE;
1.106 + }
1.107 + }
1.108 +}
1.109 +
1.110 +
1.111 +/*
1.112 + * Convert RGB to extended RGB: just swap the order of source pixels
1.113 + */
1.114 +
1.115 +INLINE
1.116 +LOCAL(void)
1.117 +rgb_rgb_convert_internal (j_decompress_ptr cinfo,
1.118 + JSAMPIMAGE input_buf, JDIMENSION input_row,
1.119 + JSAMPARRAY output_buf, int num_rows)
1.120 +{
1.121 + register JSAMPROW inptr0, inptr1, inptr2;
1.122 + register JSAMPROW outptr;
1.123 + register JDIMENSION col;
1.124 + JDIMENSION num_cols = cinfo->output_width;
1.125 +
1.126 + while (--num_rows >= 0) {
1.127 + inptr0 = input_buf[0][input_row];
1.128 + inptr1 = input_buf[1][input_row];
1.129 + inptr2 = input_buf[2][input_row];
1.130 + input_row++;
1.131 + outptr = *output_buf++;
1.132 + for (col = 0; col < num_cols; col++) {
1.133 + /* We can dispense with GETJSAMPLE() here */
1.134 + outptr[RGB_RED] = inptr0[col];
1.135 + outptr[RGB_GREEN] = inptr1[col];
1.136 + outptr[RGB_BLUE] = inptr2[col];
1.137 + /* Set unused byte to 0xFF so it can be interpreted as an opaque */
1.138 + /* alpha channel value */
1.139 +#ifdef RGB_ALPHA
1.140 + outptr[RGB_ALPHA] = 0xFF;
1.141 +#endif
1.142 + outptr += RGB_PIXELSIZE;
1.143 + }
1.144 + }
1.145 +}
