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comparison: media/libjpeg/jdcolext.c
media/libjpeg/jdcolext.c
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| -1:000000000000 | 0:8f56902574dc |
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| 1 /* | |
| 2 * jdcolext.c | |
| 3 * | |
| 4 * This file was part of the Independent JPEG Group's software: | |
| 5 * Copyright (C) 1991-1997, Thomas G. Lane. | |
| 6 * libjpeg-turbo Modifications: | |
| 7 * Copyright (C) 2009, 2011, D. R. Commander. | |
| 8 * For conditions of distribution and use, see the accompanying README file. | |
| 9 * | |
| 10 * This file contains output colorspace conversion routines. | |
| 11 */ | |
| 12 | |
| 13 | |
| 14 /* This file is included by jdcolor.c */ | |
| 15 | |
| 16 | |
| 17 /* | |
| 18 * Convert some rows of samples to the output colorspace. | |
| 19 * | |
| 20 * Note that we change from noninterleaved, one-plane-per-component format | |
| 21 * to interleaved-pixel format. The output buffer is therefore three times | |
| 22 * as wide as the input buffer. | |
| 23 * A starting row offset is provided only for the input buffer. The caller | |
| 24 * can easily adjust the passed output_buf value to accommodate any row | |
| 25 * offset required on that side. | |
| 26 */ | |
| 27 | |
| 28 INLINE | |
| 29 LOCAL(void) | |
| 30 ycc_rgb_convert_internal (j_decompress_ptr cinfo, | |
| 31 JSAMPIMAGE input_buf, JDIMENSION input_row, | |
| 32 JSAMPARRAY output_buf, int num_rows) | |
| 33 { | |
| 34 my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert; | |
| 35 register int y, cb, cr; | |
| 36 register JSAMPROW outptr; | |
| 37 register JSAMPROW inptr0, inptr1, inptr2; | |
| 38 register JDIMENSION col; | |
| 39 JDIMENSION num_cols = cinfo->output_width; | |
| 40 /* copy these pointers into registers if possible */ | |
| 41 register JSAMPLE * range_limit = cinfo->sample_range_limit; | |
| 42 register int * Crrtab = cconvert->Cr_r_tab; | |
| 43 register int * Cbbtab = cconvert->Cb_b_tab; | |
| 44 register INT32 * Crgtab = cconvert->Cr_g_tab; | |
| 45 register INT32 * Cbgtab = cconvert->Cb_g_tab; | |
| 46 SHIFT_TEMPS | |
| 47 | |
| 48 while (--num_rows >= 0) { | |
| 49 inptr0 = input_buf[0][input_row]; | |
| 50 inptr1 = input_buf[1][input_row]; | |
| 51 inptr2 = input_buf[2][input_row]; | |
| 52 input_row++; | |
| 53 outptr = *output_buf++; | |
| 54 for (col = 0; col < num_cols; col++) { | |
| 55 y = GETJSAMPLE(inptr0[col]); | |
| 56 cb = GETJSAMPLE(inptr1[col]); | |
| 57 cr = GETJSAMPLE(inptr2[col]); | |
| 58 /* Range-limiting is essential due to noise introduced by DCT losses. */ | |
| 59 outptr[RGB_RED] = range_limit[y + Crrtab[cr]]; | |
| 60 outptr[RGB_GREEN] = range_limit[y + | |
| 61 ((int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], | |
| 62 SCALEBITS))]; | |
| 63 outptr[RGB_BLUE] = range_limit[y + Cbbtab[cb]]; | |
| 64 /* Set unused byte to 0xFF so it can be interpreted as an opaque */ | |
| 65 /* alpha channel value */ | |
| 66 #ifdef RGB_ALPHA | |
| 67 outptr[RGB_ALPHA] = 0xFF; | |
| 68 #endif | |
| 69 outptr += RGB_PIXELSIZE; | |
| 70 } | |
| 71 } | |
| 72 } | |
| 73 | |
| 74 | |
| 75 /* | |
| 76 * Convert grayscale to RGB: just duplicate the graylevel three times. | |
| 77 * This is provided to support applications that don't want to cope | |
| 78 * with grayscale as a separate case. | |
| 79 */ | |
| 80 | |
| 81 INLINE | |
| 82 LOCAL(void) | |
| 83 gray_rgb_convert_internal (j_decompress_ptr cinfo, | |
| 84 JSAMPIMAGE input_buf, JDIMENSION input_row, | |
| 85 JSAMPARRAY output_buf, int num_rows) | |
| 86 { | |
| 87 register JSAMPROW inptr, outptr; | |
| 88 register JDIMENSION col; | |
| 89 JDIMENSION num_cols = cinfo->output_width; | |
| 90 | |
| 91 while (--num_rows >= 0) { | |
| 92 inptr = input_buf[0][input_row++]; | |
| 93 outptr = *output_buf++; | |
| 94 for (col = 0; col < num_cols; col++) { | |
| 95 /* We can dispense with GETJSAMPLE() here */ | |
| 96 outptr[RGB_RED] = outptr[RGB_GREEN] = outptr[RGB_BLUE] = inptr[col]; | |
| 97 /* Set unused byte to 0xFF so it can be interpreted as an opaque */ | |
| 98 /* alpha channel value */ | |
| 99 #ifdef RGB_ALPHA | |
| 100 outptr[RGB_ALPHA] = 0xFF; | |
| 101 #endif | |
| 102 outptr += RGB_PIXELSIZE; | |
| 103 } | |
| 104 } | |
| 105 } | |
| 106 | |
| 107 | |
| 108 /* | |
| 109 * Convert RGB to extended RGB: just swap the order of source pixels | |
| 110 */ | |
| 111 | |
| 112 INLINE | |
| 113 LOCAL(void) | |
| 114 rgb_rgb_convert_internal (j_decompress_ptr cinfo, | |
| 115 JSAMPIMAGE input_buf, JDIMENSION input_row, | |
| 116 JSAMPARRAY output_buf, int num_rows) | |
| 117 { | |
| 118 register JSAMPROW inptr0, inptr1, inptr2; | |
| 119 register JSAMPROW outptr; | |
| 120 register JDIMENSION col; | |
| 121 JDIMENSION num_cols = cinfo->output_width; | |
| 122 | |
| 123 while (--num_rows >= 0) { | |
| 124 inptr0 = input_buf[0][input_row]; | |
| 125 inptr1 = input_buf[1][input_row]; | |
| 126 inptr2 = input_buf[2][input_row]; | |
| 127 input_row++; | |
| 128 outptr = *output_buf++; | |
| 129 for (col = 0; col < num_cols; col++) { | |
| 130 /* We can dispense with GETJSAMPLE() here */ | |
| 131 outptr[RGB_RED] = inptr0[col]; | |
| 132 outptr[RGB_GREEN] = inptr1[col]; | |
| 133 outptr[RGB_BLUE] = inptr2[col]; | |
| 134 /* Set unused byte to 0xFF so it can be interpreted as an opaque */ | |
| 135 /* alpha channel value */ | |
| 136 #ifdef RGB_ALPHA | |
| 137 outptr[RGB_ALPHA] = 0xFF; | |
| 138 #endif | |
| 139 outptr += RGB_PIXELSIZE; | |
| 140 } | |
| 141 } | |
| 142 } |
