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comparison: media/libjpeg/jccolext.c
media/libjpeg/jccolext.c
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- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:bb656347e8a6 |
|---|---|
| 1 /* | |
| 2 * jccolext.c | |
| 3 * | |
| 4 * This file was part of the Independent JPEG Group's software: | |
| 5 * Copyright (C) 1991-1996, Thomas G. Lane. | |
| 6 * libjpeg-turbo Modifications: | |
| 7 * Copyright (C) 2009-2012, D. R. Commander. | |
| 8 * For conditions of distribution and use, see the accompanying README file. | |
| 9 * | |
| 10 * This file contains input colorspace conversion routines. | |
| 11 */ | |
| 12 | |
| 13 | |
| 14 /* This file is included by jccolor.c */ | |
| 15 | |
| 16 | |
| 17 /* | |
| 18 * Convert some rows of samples to the JPEG colorspace. | |
| 19 * | |
| 20 * Note that we change from the application's interleaved-pixel format | |
| 21 * to our internal noninterleaved, one-plane-per-component format. | |
| 22 * The input buffer is therefore three times as wide as the output buffer. | |
| 23 * | |
| 24 * A starting row offset is provided only for the output buffer. The caller | |
| 25 * can easily adjust the passed input_buf value to accommodate any row | |
| 26 * offset required on that side. | |
| 27 */ | |
| 28 | |
| 29 INLINE | |
| 30 LOCAL(void) | |
| 31 rgb_ycc_convert_internal (j_compress_ptr cinfo, | |
| 32 JSAMPARRAY input_buf, JSAMPIMAGE output_buf, | |
| 33 JDIMENSION output_row, int num_rows) | |
| 34 { | |
| 35 my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert; | |
| 36 register int r, g, b; | |
| 37 register INT32 * ctab = cconvert->rgb_ycc_tab; | |
| 38 register JSAMPROW inptr; | |
| 39 register JSAMPROW outptr0, outptr1, outptr2; | |
| 40 register JDIMENSION col; | |
| 41 JDIMENSION num_cols = cinfo->image_width; | |
| 42 | |
| 43 while (--num_rows >= 0) { | |
| 44 inptr = *input_buf++; | |
| 45 outptr0 = output_buf[0][output_row]; | |
| 46 outptr1 = output_buf[1][output_row]; | |
| 47 outptr2 = output_buf[2][output_row]; | |
| 48 output_row++; | |
| 49 for (col = 0; col < num_cols; col++) { | |
| 50 r = GETJSAMPLE(inptr[RGB_RED]); | |
| 51 g = GETJSAMPLE(inptr[RGB_GREEN]); | |
| 52 b = GETJSAMPLE(inptr[RGB_BLUE]); | |
| 53 inptr += RGB_PIXELSIZE; | |
| 54 /* If the inputs are 0..MAXJSAMPLE, the outputs of these equations | |
| 55 * must be too; we do not need an explicit range-limiting operation. | |
| 56 * Hence the value being shifted is never negative, and we don't | |
| 57 * need the general RIGHT_SHIFT macro. | |
| 58 */ | |
| 59 /* Y */ | |
| 60 outptr0[col] = (JSAMPLE) | |
| 61 ((ctab[r+R_Y_OFF] + ctab[g+G_Y_OFF] + ctab[b+B_Y_OFF]) | |
| 62 >> SCALEBITS); | |
| 63 /* Cb */ | |
| 64 outptr1[col] = (JSAMPLE) | |
| 65 ((ctab[r+R_CB_OFF] + ctab[g+G_CB_OFF] + ctab[b+B_CB_OFF]) | |
| 66 >> SCALEBITS); | |
| 67 /* Cr */ | |
| 68 outptr2[col] = (JSAMPLE) | |
| 69 ((ctab[r+R_CR_OFF] + ctab[g+G_CR_OFF] + ctab[b+B_CR_OFF]) | |
| 70 >> SCALEBITS); | |
| 71 } | |
| 72 } | |
| 73 } | |
| 74 | |
| 75 | |
| 76 /**************** Cases other than RGB -> YCbCr **************/ | |
| 77 | |
| 78 | |
| 79 /* | |
| 80 * Convert some rows of samples to the JPEG colorspace. | |
| 81 * This version handles RGB->grayscale conversion, which is the same | |
| 82 * as the RGB->Y portion of RGB->YCbCr. | |
| 83 * We assume rgb_ycc_start has been called (we only use the Y tables). | |
| 84 */ | |
| 85 | |
| 86 INLINE | |
| 87 LOCAL(void) | |
| 88 rgb_gray_convert_internal (j_compress_ptr cinfo, | |
| 89 JSAMPARRAY input_buf, JSAMPIMAGE output_buf, | |
| 90 JDIMENSION output_row, int num_rows) | |
| 91 { | |
| 92 my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert; | |
| 93 register int r, g, b; | |
| 94 register INT32 * ctab = cconvert->rgb_ycc_tab; | |
| 95 register JSAMPROW inptr; | |
| 96 register JSAMPROW outptr; | |
| 97 register JDIMENSION col; | |
| 98 JDIMENSION num_cols = cinfo->image_width; | |
| 99 | |
| 100 while (--num_rows >= 0) { | |
| 101 inptr = *input_buf++; | |
| 102 outptr = output_buf[0][output_row]; | |
| 103 output_row++; | |
| 104 for (col = 0; col < num_cols; col++) { | |
| 105 r = GETJSAMPLE(inptr[RGB_RED]); | |
| 106 g = GETJSAMPLE(inptr[RGB_GREEN]); | |
| 107 b = GETJSAMPLE(inptr[RGB_BLUE]); | |
| 108 inptr += RGB_PIXELSIZE; | |
| 109 /* Y */ | |
| 110 outptr[col] = (JSAMPLE) | |
| 111 ((ctab[r+R_Y_OFF] + ctab[g+G_Y_OFF] + ctab[b+B_Y_OFF]) | |
| 112 >> SCALEBITS); | |
| 113 } | |
| 114 } | |
| 115 } | |
| 116 | |
| 117 | |
| 118 /* | |
| 119 * Convert some rows of samples to the JPEG colorspace. | |
| 120 * This version handles extended RGB->plain RGB conversion | |
| 121 */ | |
| 122 | |
| 123 INLINE | |
| 124 LOCAL(void) | |
| 125 rgb_rgb_convert_internal (j_compress_ptr cinfo, | |
| 126 JSAMPARRAY input_buf, JSAMPIMAGE output_buf, | |
| 127 JDIMENSION output_row, int num_rows) | |
| 128 { | |
| 129 register JSAMPROW inptr; | |
| 130 register JSAMPROW outptr0, outptr1, outptr2; | |
| 131 register JDIMENSION col; | |
| 132 JDIMENSION num_cols = cinfo->image_width; | |
| 133 | |
| 134 while (--num_rows >= 0) { | |
| 135 inptr = *input_buf++; | |
| 136 outptr0 = output_buf[0][output_row]; | |
| 137 outptr1 = output_buf[1][output_row]; | |
| 138 outptr2 = output_buf[2][output_row]; | |
| 139 output_row++; | |
| 140 for (col = 0; col < num_cols; col++) { | |
| 141 outptr0[col] = GETJSAMPLE(inptr[RGB_RED]); | |
| 142 outptr1[col] = GETJSAMPLE(inptr[RGB_GREEN]); | |
| 143 outptr2[col] = GETJSAMPLE(inptr[RGB_BLUE]); | |
| 144 inptr += RGB_PIXELSIZE; | |
| 145 } | |
| 146 } | |
| 147 } |
