Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 1 | /* |
| 2 | * jccolor.c |
| 3 | * |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 4 | * Copyright (C) 1991-1996, Thomas G. Lane. |
Pierre Ossman | 59a3938 | 2009-03-09 13:15:56 +0000 | [diff] [blame] | 5 | * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB |
DRC | f25c071 | 2009-04-03 12:00:51 +0000 | [diff] [blame] | 6 | * Copyright 2009 D. R. Commander |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 7 | * This file is part of the Independent JPEG Group's software. |
| 8 | * For conditions of distribution and use, see the accompanying README file. |
| 9 | * |
| 10 | * This file contains input colorspace conversion routines. |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 11 | */ |
| 12 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 13 | #define JPEG_INTERNALS |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 14 | #include "jinclude.h" |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 15 | #include "jpeglib.h" |
Pierre Ossman | 59a3938 | 2009-03-09 13:15:56 +0000 | [diff] [blame] | 16 | #include "jsimd.h" |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 17 | |
| 18 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 19 | /* Private subobject */ |
| 20 | |
| 21 | typedef struct { |
| 22 | struct jpeg_color_converter pub; /* public fields */ |
| 23 | |
| 24 | /* Private state for RGB->YCC conversion */ |
| 25 | INT32 * rgb_ycc_tab; /* => table for RGB to YCbCr conversion */ |
| 26 | } my_color_converter; |
| 27 | |
| 28 | typedef my_color_converter * my_cconvert_ptr; |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 29 | |
| 30 | |
Thomas G. Lane | 88aeed4 | 1992-12-10 00:00:00 +0000 | [diff] [blame] | 31 | /**************** RGB -> YCbCr conversion: most common case **************/ |
| 32 | |
| 33 | /* |
| 34 | * YCbCr is defined per CCIR 601-1, except that Cb and Cr are |
| 35 | * normalized to the range 0..MAXJSAMPLE rather than -0.5 .. 0.5. |
| 36 | * The conversion equations to be implemented are therefore |
| 37 | * Y = 0.29900 * R + 0.58700 * G + 0.11400 * B |
Thomas G. Lane | 9ba2f5e | 1994-12-07 00:00:00 +0000 | [diff] [blame] | 38 | * Cb = -0.16874 * R - 0.33126 * G + 0.50000 * B + CENTERJSAMPLE |
| 39 | * Cr = 0.50000 * R - 0.41869 * G - 0.08131 * B + CENTERJSAMPLE |
Thomas G. Lane | 88aeed4 | 1992-12-10 00:00:00 +0000 | [diff] [blame] | 40 | * (These numbers are derived from TIFF 6.0 section 21, dated 3-June-92.) |
Thomas G. Lane | 9ba2f5e | 1994-12-07 00:00:00 +0000 | [diff] [blame] | 41 | * Note: older versions of the IJG code used a zero offset of MAXJSAMPLE/2, |
| 42 | * rather than CENTERJSAMPLE, for Cb and Cr. This gave equal positive and |
| 43 | * negative swings for Cb/Cr, but meant that grayscale values (Cb=Cr=0) |
| 44 | * were not represented exactly. Now we sacrifice exact representation of |
| 45 | * maximum red and maximum blue in order to get exact grayscales. |
Thomas G. Lane | 88aeed4 | 1992-12-10 00:00:00 +0000 | [diff] [blame] | 46 | * |
| 47 | * To avoid floating-point arithmetic, we represent the fractional constants |
| 48 | * as integers scaled up by 2^16 (about 4 digits precision); we have to divide |
| 49 | * the products by 2^16, with appropriate rounding, to get the correct answer. |
| 50 | * |
| 51 | * For even more speed, we avoid doing any multiplications in the inner loop |
| 52 | * by precalculating the constants times R,G,B for all possible values. |
| 53 | * For 8-bit JSAMPLEs this is very reasonable (only 256 entries per table); |
| 54 | * for 12-bit samples it is still acceptable. It's not very reasonable for |
| 55 | * 16-bit samples, but if you want lossless storage you shouldn't be changing |
| 56 | * colorspace anyway. |
Thomas G. Lane | 9ba2f5e | 1994-12-07 00:00:00 +0000 | [diff] [blame] | 57 | * The CENTERJSAMPLE offsets and the rounding fudge-factor of 0.5 are included |
Thomas G. Lane | 88aeed4 | 1992-12-10 00:00:00 +0000 | [diff] [blame] | 58 | * in the tables to save adding them separately in the inner loop. |
| 59 | */ |
| 60 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 61 | #define SCALEBITS 16 /* speediest right-shift on some machines */ |
Thomas G. Lane | 9ba2f5e | 1994-12-07 00:00:00 +0000 | [diff] [blame] | 62 | #define CBCR_OFFSET ((INT32) CENTERJSAMPLE << SCALEBITS) |
Thomas G. Lane | 88aeed4 | 1992-12-10 00:00:00 +0000 | [diff] [blame] | 63 | #define ONE_HALF ((INT32) 1 << (SCALEBITS-1)) |
| 64 | #define FIX(x) ((INT32) ((x) * (1L<<SCALEBITS) + 0.5)) |
| 65 | |
| 66 | /* We allocate one big table and divide it up into eight parts, instead of |
| 67 | * doing eight alloc_small requests. This lets us use a single table base |
| 68 | * address, which can be held in a register in the inner loops on many |
| 69 | * machines (more than can hold all eight addresses, anyway). |
| 70 | */ |
| 71 | |
Thomas G. Lane | 88aeed4 | 1992-12-10 00:00:00 +0000 | [diff] [blame] | 72 | #define R_Y_OFF 0 /* offset to R => Y section */ |
| 73 | #define G_Y_OFF (1*(MAXJSAMPLE+1)) /* offset to G => Y section */ |
| 74 | #define B_Y_OFF (2*(MAXJSAMPLE+1)) /* etc. */ |
| 75 | #define R_CB_OFF (3*(MAXJSAMPLE+1)) |
| 76 | #define G_CB_OFF (4*(MAXJSAMPLE+1)) |
| 77 | #define B_CB_OFF (5*(MAXJSAMPLE+1)) |
| 78 | #define R_CR_OFF B_CB_OFF /* B=>Cb, R=>Cr are the same */ |
| 79 | #define G_CR_OFF (6*(MAXJSAMPLE+1)) |
| 80 | #define B_CR_OFF (7*(MAXJSAMPLE+1)) |
| 81 | #define TABLE_SIZE (8*(MAXJSAMPLE+1)) |
| 82 | |
| 83 | |
DRC | 6c0e1fc | 2009-09-24 06:18:25 +0000 | [diff] [blame] | 84 | #if BITS_IN_JSAMPLE == 8 |
| 85 | |
| 86 | const unsigned char red_lut[256] = { |
| 87 | 0 , 0 , 1 , 1 , 1 , 1 , 2 , 2 , 2 , 3 , 3 , 3 , 4 , 4 , 4 , 4 , |
| 88 | 5 , 5 , 5 , 6 , 6 , 6 , 7 , 7 , 7 , 7 , 8 , 8 , 8 , 9 , 9 , 9 , |
| 89 | 10, 10, 10, 10, 11, 11, 11, 12, 12, 12, 13, 13, 13, 13, 14, 14, |
| 90 | 14, 15, 15, 15, 16, 16, 16, 16, 17, 17, 17, 18, 18, 18, 19, 19, |
| 91 | 19, 19, 20, 20, 20, 21, 21, 21, 22, 22, 22, 22, 23, 23, 23, 24, |
| 92 | 24, 24, 25, 25, 25, 25, 26, 26, 26, 27, 27, 27, 28, 28, 28, 28, |
| 93 | 29, 29, 29, 30, 30, 30, 30, 31, 31, 31, 32, 32, 32, 33, 33, 33, |
| 94 | 33, 34, 34, 34, 35, 35, 35, 36, 36, 36, 36, 37, 37, 37, 38, 38, |
| 95 | 38, 39, 39, 39, 39, 40, 40, 40, 41, 41, 41, 42, 42, 42, 42, 43, |
| 96 | 43, 43, 44, 44, 44, 45, 45, 45, 45, 46, 46, 46, 47, 47, 47, 48, |
| 97 | 48, 48, 48, 49, 49, 49, 50, 50, 50, 51, 51, 51, 51, 52, 52, 52, |
| 98 | 53, 53, 53, 54, 54, 54, 54, 55, 55, 55, 56, 56, 56, 57, 57, 57, |
| 99 | 57, 58, 58, 58, 59, 59, 59, 60, 60, 60, 60, 61, 61, 61, 62, 62, |
| 100 | 62, 62, 63, 63, 63, 64, 64, 64, 65, 65, 65, 65, 66, 66, 66, 67, |
| 101 | 67, 67, 68, 68, 68, 68, 69, 69, 69, 70, 70, 70, 71, 71, 71, 71, |
| 102 | 72, 72, 72, 73, 73, 73, 74, 74, 74, 74, 75, 75, 75, 76, 76, 76 |
| 103 | }; |
| 104 | |
| 105 | const unsigned char green_lut[256] = { |
| 106 | 0 , 1 , 1 , 2 , 2 , 3 , 4 , 4 , 5 , 5 , 6 , 6 , |
| 107 | 7 , 8 , 8 , 9 , 9 , 10 , 11 , 11 , 12 , 12 , 13 , 14 , |
| 108 | 14 , 15 , 15 , 16 , 16 , 17 , 18 , 18 , 19 , 19 , 20 , 21 , |
| 109 | 21 , 22 , 22 , 23 , 23 , 24 , 25 , 25 , 26 , 26 , 27 , 28 , |
| 110 | 28 , 29 , 29 , 30 , 31 , 31 , 32 , 32 , 33 , 33 , 34 , 35 , |
| 111 | 35 , 36 , 36 , 37 , 38 , 38 , 39 , 39 , 40 , 41 , 41 , 42 , |
| 112 | 42 , 43 , 43 , 44 , 45 , 45 , 46 , 46 , 47 , 48 , 48 , 49 , |
| 113 | 49 , 50 , 50 , 51 , 52 , 52 , 53 , 53 , 54 , 55 , 55 , 56 , |
| 114 | 56 , 57 , 58 , 58 , 59 , 59 , 60 , 60 , 61 , 62 , 62 , 63 , |
| 115 | 63 , 64 , 65 , 65 , 66 , 66 , 67 , 68 , 68 , 69 , 69 , 70 , |
| 116 | 70 , 71 , 72 , 72 , 73 , 73 , 74 , 75 , 75 , 76 , 76 , 77 , |
| 117 | 77 , 78 , 79 , 79 , 80 , 80 , 81 , 82 , 82 , 83 , 83 , 84 , |
| 118 | 85 , 85 , 86 , 86 , 87 , 87 , 88 , 89 , 89 , 90 , 90 , 91 , |
| 119 | 92 , 92 , 93 , 93 , 94 , 95 , 95 , 96 , 96 , 97 , 97 , 98 , |
| 120 | 99 , 99 , 100, 100, 101, 102, 102, 103, 103, 104, 104, 105, |
| 121 | 106, 106, 107, 107, 108, 109, 109, 110, 110, 111, 112, 112, |
| 122 | 113, 113, 114, 114, 115, 116, 116, 117, 117, 118, 119, 119, |
| 123 | 120, 120, 121, 122, 122, 123, 123, 124, 124, 125, 126, 126, |
| 124 | 127, 127, 128, 129, 129, 130, 130, 131, 131, 132, 133, 133, |
| 125 | 34, 134, 135, 136, 136, 137, 137, 138, 139, 139, 140, 140, |
| 126 | 141, 141, 142, 143, 143, 144, 144, 145, 146, 146, 147, 147, |
| 127 | 148, 149, 149, 150 |
| 128 | }; |
| 129 | |
| 130 | const unsigned char blue_lut[256] = { |
| 131 | 0 , 0 , 0 , 0 , 0 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 2 , 2 , |
| 132 | 2 , 2 , 2 , 2 , 2 , 2 , 3 , 3 , 3 , 3 , 3 , 3 , 3 , 3 , 3 , 4 , |
| 133 | 4 , 4 , 4 , 4 , 4 , 4 , 4 , 4 , 5 , 5 , 5 , 5 , 5 , 5 , 5 , 5 , |
| 134 | 5 , 6 , 6 , 6 , 6 , 6 , 6 , 6 , 6 , 6 , 7 , 7 , 7 , 7 , 7 , 7 , |
| 135 | 7 , 7 , 8 , 8 , 8 , 8 , 8 , 8 , 8 , 8 , 8 , 9 , 9 , 9 , 9 , 9 , |
| 136 | 9 , 9 , 9 , 9 , 10, 10, 10, 10, 10, 10, 10, 10, 10, 11, 11, 11, |
| 137 | 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 13, 13, |
| 138 | 13, 13, 13, 13, 13, 13, 13, 14, 14, 14, 14, 14, 14, 14, 14, 14, |
| 139 | 15, 15, 15, 15, 15, 15, 15, 15, 16, 16, 16, 16, 16, 16, 16, 16, |
| 140 | 16, 17, 17, 17, 17, 17, 17, 17, 17, 17, 18, 18, 18, 18, 18, 18, |
| 141 | 18, 18, 18, 19, 19, 19, 19, 19, 19, 19, 19, 19, 20, 20, 20, 20, |
| 142 | 20, 20, 20, 20, 21, 21, 21, 21, 21, 21, 21, 21, 21, 22, 22, 22, |
| 143 | 22, 22, 22, 22, 22, 22, 23, 23, 23, 23, 23, 23, 23, 23, 23, 24, |
| 144 | 24, 24, 24, 24, 24, 24, 24, 25, 25, 25, 25, 25, 25, 25, 25, 25, |
| 145 | 26, 26, 26, 26, 26, 26, 26, 26, 26, 27, 27, 27, 27, 27, 27, 27, |
| 146 | 27, 27, 28, 28, 28, 28, 28, 28, 28, 28, 29, 29, 29, 29, 29, 29 |
| 147 | }; |
| 148 | |
| 149 | #endif |
| 150 | |
| 151 | |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 152 | /* |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 153 | * Initialize for RGB->YCC colorspace conversion. |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 154 | */ |
| 155 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 156 | METHODDEF(void) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 157 | rgb_ycc_start (j_compress_ptr cinfo) |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 158 | { |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 159 | my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert; |
| 160 | INT32 * rgb_ycc_tab; |
Thomas G. Lane | 88aeed4 | 1992-12-10 00:00:00 +0000 | [diff] [blame] | 161 | INT32 i; |
| 162 | |
Thomas G. Lane | 88aeed4 | 1992-12-10 00:00:00 +0000 | [diff] [blame] | 163 | /* Allocate and fill in the conversion tables. */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 164 | cconvert->rgb_ycc_tab = rgb_ycc_tab = (INT32 *) |
| 165 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
| 166 | (TABLE_SIZE * SIZEOF(INT32))); |
Thomas G. Lane | 88aeed4 | 1992-12-10 00:00:00 +0000 | [diff] [blame] | 167 | |
| 168 | for (i = 0; i <= MAXJSAMPLE; i++) { |
| 169 | rgb_ycc_tab[i+R_Y_OFF] = FIX(0.29900) * i; |
| 170 | rgb_ycc_tab[i+G_Y_OFF] = FIX(0.58700) * i; |
| 171 | rgb_ycc_tab[i+B_Y_OFF] = FIX(0.11400) * i + ONE_HALF; |
| 172 | rgb_ycc_tab[i+R_CB_OFF] = (-FIX(0.16874)) * i; |
| 173 | rgb_ycc_tab[i+G_CB_OFF] = (-FIX(0.33126)) * i; |
Thomas G. Lane | 9ba2f5e | 1994-12-07 00:00:00 +0000 | [diff] [blame] | 174 | /* We use a rounding fudge-factor of 0.5-epsilon for Cb and Cr. |
| 175 | * This ensures that the maximum output will round to MAXJSAMPLE |
| 176 | * not MAXJSAMPLE+1, and thus that we don't have to range-limit. |
| 177 | */ |
| 178 | rgb_ycc_tab[i+B_CB_OFF] = FIX(0.50000) * i + CBCR_OFFSET + ONE_HALF-1; |
Thomas G. Lane | 88aeed4 | 1992-12-10 00:00:00 +0000 | [diff] [blame] | 179 | /* B=>Cb and R=>Cr tables are the same |
Thomas G. Lane | 9ba2f5e | 1994-12-07 00:00:00 +0000 | [diff] [blame] | 180 | rgb_ycc_tab[i+R_CR_OFF] = FIX(0.50000) * i + CBCR_OFFSET + ONE_HALF-1; |
Thomas G. Lane | 88aeed4 | 1992-12-10 00:00:00 +0000 | [diff] [blame] | 181 | */ |
| 182 | rgb_ycc_tab[i+G_CR_OFF] = (-FIX(0.41869)) * i; |
| 183 | rgb_ycc_tab[i+B_CR_OFF] = (-FIX(0.08131)) * i; |
| 184 | } |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 185 | } |
| 186 | |
| 187 | |
| 188 | /* |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 189 | * Convert some rows of samples to the JPEG colorspace. |
| 190 | * |
| 191 | * Note that we change from the application's interleaved-pixel format |
| 192 | * to our internal noninterleaved, one-plane-per-component format. |
| 193 | * The input buffer is therefore three times as wide as the output buffer. |
| 194 | * |
| 195 | * A starting row offset is provided only for the output buffer. The caller |
| 196 | * can easily adjust the passed input_buf value to accommodate any row |
| 197 | * offset required on that side. |
Thomas G. Lane | 4a6b730 | 1992-03-17 00:00:00 +0000 | [diff] [blame] | 198 | */ |
| 199 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 200 | METHODDEF(void) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 201 | rgb_ycc_convert (j_compress_ptr cinfo, |
| 202 | JSAMPARRAY input_buf, JSAMPIMAGE output_buf, |
| 203 | JDIMENSION output_row, int num_rows) |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 204 | { |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 205 | my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert; |
Thomas G. Lane | 88aeed4 | 1992-12-10 00:00:00 +0000 | [diff] [blame] | 206 | register int r, g, b; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 207 | register INT32 * ctab = cconvert->rgb_ycc_tab; |
| 208 | register JSAMPROW inptr; |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 209 | register JSAMPROW outptr0, outptr1, outptr2; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 210 | register JDIMENSION col; |
| 211 | JDIMENSION num_cols = cinfo->image_width; |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 212 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 213 | while (--num_rows >= 0) { |
| 214 | inptr = *input_buf++; |
| 215 | outptr0 = output_buf[0][output_row]; |
| 216 | outptr1 = output_buf[1][output_row]; |
| 217 | outptr2 = output_buf[2][output_row]; |
| 218 | output_row++; |
| 219 | for (col = 0; col < num_cols; col++) { |
DRC | f25c071 | 2009-04-03 12:00:51 +0000 | [diff] [blame] | 220 | r = GETJSAMPLE(inptr[rgb_red[cinfo->in_color_space]]); |
| 221 | g = GETJSAMPLE(inptr[rgb_green[cinfo->in_color_space]]); |
| 222 | b = GETJSAMPLE(inptr[rgb_blue[cinfo->in_color_space]]); |
| 223 | inptr += rgb_pixelsize[cinfo->in_color_space]; |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 224 | /* If the inputs are 0..MAXJSAMPLE, the outputs of these equations |
Thomas G. Lane | 4a6b730 | 1992-03-17 00:00:00 +0000 | [diff] [blame] | 225 | * must be too; we do not need an explicit range-limiting operation. |
| 226 | * Hence the value being shifted is never negative, and we don't |
| 227 | * need the general RIGHT_SHIFT macro. |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 228 | */ |
| 229 | /* Y */ |
Thomas G. Lane | 88aeed4 | 1992-12-10 00:00:00 +0000 | [diff] [blame] | 230 | outptr0[col] = (JSAMPLE) |
| 231 | ((ctab[r+R_Y_OFF] + ctab[g+G_Y_OFF] + ctab[b+B_Y_OFF]) |
| 232 | >> SCALEBITS); |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 233 | /* Cb */ |
Thomas G. Lane | 88aeed4 | 1992-12-10 00:00:00 +0000 | [diff] [blame] | 234 | outptr1[col] = (JSAMPLE) |
| 235 | ((ctab[r+R_CB_OFF] + ctab[g+G_CB_OFF] + ctab[b+B_CB_OFF]) |
| 236 | >> SCALEBITS); |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 237 | /* Cr */ |
Thomas G. Lane | 88aeed4 | 1992-12-10 00:00:00 +0000 | [diff] [blame] | 238 | outptr2[col] = (JSAMPLE) |
| 239 | ((ctab[r+R_CR_OFF] + ctab[g+G_CR_OFF] + ctab[b+B_CR_OFF]) |
| 240 | >> SCALEBITS); |
| 241 | } |
| 242 | } |
| 243 | } |
| 244 | |
| 245 | |
| 246 | /**************** Cases other than RGB -> YCbCr **************/ |
| 247 | |
| 248 | |
| 249 | /* |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 250 | * Convert some rows of samples to the JPEG colorspace. |
Thomas G. Lane | 88aeed4 | 1992-12-10 00:00:00 +0000 | [diff] [blame] | 251 | * This version handles RGB->grayscale conversion, which is the same |
| 252 | * as the RGB->Y portion of RGB->YCbCr. |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 253 | * We assume rgb_ycc_start has been called (we only use the Y tables). |
Thomas G. Lane | 88aeed4 | 1992-12-10 00:00:00 +0000 | [diff] [blame] | 254 | */ |
| 255 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 256 | METHODDEF(void) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 257 | rgb_gray_convert (j_compress_ptr cinfo, |
| 258 | JSAMPARRAY input_buf, JSAMPIMAGE output_buf, |
| 259 | JDIMENSION output_row, int num_rows) |
Thomas G. Lane | 88aeed4 | 1992-12-10 00:00:00 +0000 | [diff] [blame] | 260 | { |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 261 | my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert; |
DRC | 6c0e1fc | 2009-09-24 06:18:25 +0000 | [diff] [blame] | 262 | #if BITS_IN_JSAMPLE != 8 |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 263 | register INT32 * ctab = cconvert->rgb_ycc_tab; |
DRC | 6c0e1fc | 2009-09-24 06:18:25 +0000 | [diff] [blame] | 264 | #endif |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 265 | register JSAMPROW inptr; |
Thomas G. Lane | 88aeed4 | 1992-12-10 00:00:00 +0000 | [diff] [blame] | 266 | register JSAMPROW outptr; |
DRC | 6c0e1fc | 2009-09-24 06:18:25 +0000 | [diff] [blame] | 267 | JSAMPLE *maxoutptr; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 268 | register JDIMENSION col; |
| 269 | JDIMENSION num_cols = cinfo->image_width; |
DRC | 6c0e1fc | 2009-09-24 06:18:25 +0000 | [diff] [blame] | 270 | int rindex = rgb_red[cinfo->in_color_space]; |
| 271 | int gindex = rgb_green[cinfo->in_color_space]; |
| 272 | int bindex = rgb_blue[cinfo->in_color_space]; |
| 273 | int rgbstride = rgb_pixelsize[cinfo->in_color_space]; |
Thomas G. Lane | 88aeed4 | 1992-12-10 00:00:00 +0000 | [diff] [blame] | 274 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 275 | while (--num_rows >= 0) { |
| 276 | inptr = *input_buf++; |
| 277 | outptr = output_buf[0][output_row]; |
DRC | 6c0e1fc | 2009-09-24 06:18:25 +0000 | [diff] [blame] | 278 | maxoutptr = &outptr[num_cols]; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 279 | output_row++; |
DRC | 6c0e1fc | 2009-09-24 06:18:25 +0000 | [diff] [blame] | 280 | for (; outptr < maxoutptr; outptr++, inptr += rgbstride) { |
Thomas G. Lane | 88aeed4 | 1992-12-10 00:00:00 +0000 | [diff] [blame] | 281 | /* Y */ |
DRC | 6c0e1fc | 2009-09-24 06:18:25 +0000 | [diff] [blame] | 282 | #if BITS_IN_JSAMPLE == 8 |
| 283 | *outptr = red_lut[inptr[rindex]] + green_lut[inptr[gindex]] |
| 284 | + blue_lut[inptr[bindex]]; |
| 285 | #else |
| 286 | *outptr = (JSAMPLE) |
| 287 | ((ctab[GETJSAMPLE(inptr[rindex])+R_Y_OFF] |
| 288 | + ctab[GETJSAMPLE(inptr[gindex])+G_Y_OFF] |
| 289 | + ctab[GETJSAMPLE(inptr[bindex])+B_Y_OFF]) |
| 290 | >> SCALEBITS); |
| 291 | #endif |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 292 | } |
| 293 | } |
| 294 | } |
| 295 | |
| 296 | |
| 297 | /* |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 298 | * Convert some rows of samples to the JPEG colorspace. |
| 299 | * This version handles Adobe-style CMYK->YCCK conversion, |
| 300 | * where we convert R=1-C, G=1-M, and B=1-Y to YCbCr using the same |
| 301 | * conversion as above, while passing K (black) unchanged. |
| 302 | * We assume rgb_ycc_start has been called. |
Thomas G. Lane | 88aeed4 | 1992-12-10 00:00:00 +0000 | [diff] [blame] | 303 | */ |
| 304 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 305 | METHODDEF(void) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 306 | cmyk_ycck_convert (j_compress_ptr cinfo, |
| 307 | JSAMPARRAY input_buf, JSAMPIMAGE output_buf, |
| 308 | JDIMENSION output_row, int num_rows) |
Thomas G. Lane | 88aeed4 | 1992-12-10 00:00:00 +0000 | [diff] [blame] | 309 | { |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 310 | my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert; |
| 311 | register int r, g, b; |
| 312 | register INT32 * ctab = cconvert->rgb_ycc_tab; |
| 313 | register JSAMPROW inptr; |
| 314 | register JSAMPROW outptr0, outptr1, outptr2, outptr3; |
| 315 | register JDIMENSION col; |
| 316 | JDIMENSION num_cols = cinfo->image_width; |
Thomas G. Lane | 88aeed4 | 1992-12-10 00:00:00 +0000 | [diff] [blame] | 317 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 318 | while (--num_rows >= 0) { |
| 319 | inptr = *input_buf++; |
| 320 | outptr0 = output_buf[0][output_row]; |
| 321 | outptr1 = output_buf[1][output_row]; |
| 322 | outptr2 = output_buf[2][output_row]; |
| 323 | outptr3 = output_buf[3][output_row]; |
| 324 | output_row++; |
| 325 | for (col = 0; col < num_cols; col++) { |
| 326 | r = MAXJSAMPLE - GETJSAMPLE(inptr[0]); |
| 327 | g = MAXJSAMPLE - GETJSAMPLE(inptr[1]); |
| 328 | b = MAXJSAMPLE - GETJSAMPLE(inptr[2]); |
| 329 | /* K passes through as-is */ |
| 330 | outptr3[col] = inptr[3]; /* don't need GETJSAMPLE here */ |
| 331 | inptr += 4; |
| 332 | /* If the inputs are 0..MAXJSAMPLE, the outputs of these equations |
| 333 | * must be too; we do not need an explicit range-limiting operation. |
| 334 | * Hence the value being shifted is never negative, and we don't |
| 335 | * need the general RIGHT_SHIFT macro. |
| 336 | */ |
| 337 | /* Y */ |
| 338 | outptr0[col] = (JSAMPLE) |
| 339 | ((ctab[r+R_Y_OFF] + ctab[g+G_Y_OFF] + ctab[b+B_Y_OFF]) |
| 340 | >> SCALEBITS); |
| 341 | /* Cb */ |
| 342 | outptr1[col] = (JSAMPLE) |
| 343 | ((ctab[r+R_CB_OFF] + ctab[g+G_CB_OFF] + ctab[b+B_CB_OFF]) |
| 344 | >> SCALEBITS); |
| 345 | /* Cr */ |
| 346 | outptr2[col] = (JSAMPLE) |
| 347 | ((ctab[r+R_CR_OFF] + ctab[g+G_CR_OFF] + ctab[b+B_CR_OFF]) |
| 348 | >> SCALEBITS); |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 349 | } |
| 350 | } |
| 351 | } |
| 352 | |
| 353 | |
| 354 | /* |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 355 | * Convert some rows of samples to the JPEG colorspace. |
| 356 | * This version handles grayscale output with no conversion. |
| 357 | * The source can be either plain grayscale or YCbCr (since Y == gray). |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 358 | */ |
| 359 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 360 | METHODDEF(void) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 361 | grayscale_convert (j_compress_ptr cinfo, |
| 362 | JSAMPARRAY input_buf, JSAMPIMAGE output_buf, |
| 363 | JDIMENSION output_row, int num_rows) |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 364 | { |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 365 | register JSAMPROW inptr; |
| 366 | register JSAMPROW outptr; |
| 367 | register JDIMENSION col; |
| 368 | JDIMENSION num_cols = cinfo->image_width; |
| 369 | int instride = cinfo->input_components; |
| 370 | |
| 371 | while (--num_rows >= 0) { |
| 372 | inptr = *input_buf++; |
| 373 | outptr = output_buf[0][output_row]; |
| 374 | output_row++; |
| 375 | for (col = 0; col < num_cols; col++) { |
| 376 | outptr[col] = inptr[0]; /* don't need GETJSAMPLE() here */ |
| 377 | inptr += instride; |
| 378 | } |
| 379 | } |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 380 | } |
| 381 | |
| 382 | |
| 383 | /* |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 384 | * Convert some rows of samples to the JPEG colorspace. |
| 385 | * This version handles multi-component colorspaces without conversion. |
| 386 | * We assume input_components == num_components. |
| 387 | */ |
| 388 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 389 | METHODDEF(void) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 390 | null_convert (j_compress_ptr cinfo, |
| 391 | JSAMPARRAY input_buf, JSAMPIMAGE output_buf, |
| 392 | JDIMENSION output_row, int num_rows) |
| 393 | { |
| 394 | register JSAMPROW inptr; |
| 395 | register JSAMPROW outptr; |
| 396 | register JDIMENSION col; |
| 397 | register int ci; |
| 398 | int nc = cinfo->num_components; |
| 399 | JDIMENSION num_cols = cinfo->image_width; |
| 400 | |
| 401 | while (--num_rows >= 0) { |
| 402 | /* It seems fastest to make a separate pass for each component. */ |
| 403 | for (ci = 0; ci < nc; ci++) { |
| 404 | inptr = *input_buf; |
| 405 | outptr = output_buf[ci][output_row]; |
| 406 | for (col = 0; col < num_cols; col++) { |
| 407 | outptr[col] = inptr[ci]; /* don't need GETJSAMPLE() here */ |
| 408 | inptr += nc; |
| 409 | } |
| 410 | } |
| 411 | input_buf++; |
| 412 | output_row++; |
| 413 | } |
| 414 | } |
| 415 | |
| 416 | |
| 417 | /* |
| 418 | * Empty method for start_pass. |
| 419 | */ |
| 420 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 421 | METHODDEF(void) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 422 | null_method (j_compress_ptr cinfo) |
| 423 | { |
| 424 | /* no work needed */ |
| 425 | } |
| 426 | |
| 427 | |
| 428 | /* |
| 429 | * Module initialization routine for input colorspace conversion. |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 430 | */ |
| 431 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 432 | GLOBAL(void) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 433 | jinit_color_converter (j_compress_ptr cinfo) |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 434 | { |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 435 | my_cconvert_ptr cconvert; |
| 436 | |
| 437 | cconvert = (my_cconvert_ptr) |
| 438 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
| 439 | SIZEOF(my_color_converter)); |
| 440 | cinfo->cconvert = (struct jpeg_color_converter *) cconvert; |
| 441 | /* set start_pass to null method until we find out differently */ |
| 442 | cconvert->pub.start_pass = null_method; |
| 443 | |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 444 | /* Make sure input_components agrees with in_color_space */ |
| 445 | switch (cinfo->in_color_space) { |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 446 | case JCS_GRAYSCALE: |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 447 | if (cinfo->input_components != 1) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 448 | ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE); |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 449 | break; |
| 450 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 451 | case JCS_RGB: |
DRC | f25c071 | 2009-04-03 12:00:51 +0000 | [diff] [blame] | 452 | case JCS_EXT_RGB: |
| 453 | case JCS_EXT_RGBX: |
| 454 | case JCS_EXT_BGR: |
| 455 | case JCS_EXT_BGRX: |
| 456 | case JCS_EXT_XBGR: |
| 457 | case JCS_EXT_XRGB: |
| 458 | if (cinfo->input_components != rgb_pixelsize[cinfo->in_color_space]) |
| 459 | ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE); |
| 460 | break; |
| 461 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 462 | case JCS_YCbCr: |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 463 | if (cinfo->input_components != 3) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 464 | ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE); |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 465 | break; |
| 466 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 467 | case JCS_CMYK: |
| 468 | case JCS_YCCK: |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 469 | if (cinfo->input_components != 4) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 470 | ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE); |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 471 | break; |
| 472 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 473 | default: /* JCS_UNKNOWN can be anything */ |
| 474 | if (cinfo->input_components < 1) |
| 475 | ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE); |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 476 | break; |
| 477 | } |
| 478 | |
| 479 | /* Check num_components, set conversion method based on requested space */ |
| 480 | switch (cinfo->jpeg_color_space) { |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 481 | case JCS_GRAYSCALE: |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 482 | if (cinfo->num_components != 1) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 483 | ERREXIT(cinfo, JERR_BAD_J_COLORSPACE); |
| 484 | if (cinfo->in_color_space == JCS_GRAYSCALE) |
| 485 | cconvert->pub.color_convert = grayscale_convert; |
DRC | f25c071 | 2009-04-03 12:00:51 +0000 | [diff] [blame] | 486 | else if (cinfo->in_color_space == JCS_RGB || |
| 487 | cinfo->in_color_space == JCS_EXT_RGB || |
| 488 | cinfo->in_color_space == JCS_EXT_RGBX || |
| 489 | cinfo->in_color_space == JCS_EXT_BGR || |
| 490 | cinfo->in_color_space == JCS_EXT_BGRX || |
| 491 | cinfo->in_color_space == JCS_EXT_XBGR || |
| 492 | cinfo->in_color_space == JCS_EXT_XRGB) { |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 493 | cconvert->pub.start_pass = rgb_ycc_start; |
| 494 | cconvert->pub.color_convert = rgb_gray_convert; |
| 495 | } else if (cinfo->in_color_space == JCS_YCbCr) |
| 496 | cconvert->pub.color_convert = grayscale_convert; |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 497 | else |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 498 | ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL); |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 499 | break; |
| 500 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 501 | case JCS_RGB: |
DRC | f25c071 | 2009-04-03 12:00:51 +0000 | [diff] [blame] | 502 | case JCS_EXT_RGB: |
| 503 | case JCS_EXT_RGBX: |
| 504 | case JCS_EXT_BGR: |
| 505 | case JCS_EXT_BGRX: |
| 506 | case JCS_EXT_XBGR: |
| 507 | case JCS_EXT_XRGB: |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 508 | if (cinfo->num_components != 3) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 509 | ERREXIT(cinfo, JERR_BAD_J_COLORSPACE); |
DRC | f25c071 | 2009-04-03 12:00:51 +0000 | [diff] [blame] | 510 | if (cinfo->in_color_space == cinfo->jpeg_color_space && |
| 511 | rgb_pixelsize[cinfo->in_color_space] == 3) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 512 | cconvert->pub.color_convert = null_convert; |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 513 | else |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 514 | ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL); |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 515 | break; |
| 516 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 517 | case JCS_YCbCr: |
| 518 | if (cinfo->num_components != 3) |
| 519 | ERREXIT(cinfo, JERR_BAD_J_COLORSPACE); |
DRC | f25c071 | 2009-04-03 12:00:51 +0000 | [diff] [blame] | 520 | if (cinfo->in_color_space == JCS_RGB || |
| 521 | cinfo->in_color_space == JCS_EXT_RGB || |
| 522 | cinfo->in_color_space == JCS_EXT_RGBX || |
| 523 | cinfo->in_color_space == JCS_EXT_BGR || |
| 524 | cinfo->in_color_space == JCS_EXT_BGRX || |
| 525 | cinfo->in_color_space == JCS_EXT_XBGR || |
| 526 | cinfo->in_color_space == JCS_EXT_XRGB) { |
Pierre Ossman | 59a3938 | 2009-03-09 13:15:56 +0000 | [diff] [blame] | 527 | if (jsimd_can_rgb_ycc()) |
| 528 | cconvert->pub.color_convert = jsimd_rgb_ycc_convert; |
| 529 | else { |
| 530 | cconvert->pub.start_pass = rgb_ycc_start; |
| 531 | cconvert->pub.color_convert = rgb_ycc_convert; |
| 532 | } |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 533 | } else if (cinfo->in_color_space == JCS_YCbCr) |
| 534 | cconvert->pub.color_convert = null_convert; |
| 535 | else |
| 536 | ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL); |
| 537 | break; |
| 538 | |
| 539 | case JCS_CMYK: |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 540 | if (cinfo->num_components != 4) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 541 | ERREXIT(cinfo, JERR_BAD_J_COLORSPACE); |
| 542 | if (cinfo->in_color_space == JCS_CMYK) |
| 543 | cconvert->pub.color_convert = null_convert; |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 544 | else |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 545 | ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL); |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 546 | break; |
| 547 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 548 | case JCS_YCCK: |
| 549 | if (cinfo->num_components != 4) |
| 550 | ERREXIT(cinfo, JERR_BAD_J_COLORSPACE); |
| 551 | if (cinfo->in_color_space == JCS_CMYK) { |
| 552 | cconvert->pub.start_pass = rgb_ycc_start; |
| 553 | cconvert->pub.color_convert = cmyk_ycck_convert; |
| 554 | } else if (cinfo->in_color_space == JCS_YCCK) |
| 555 | cconvert->pub.color_convert = null_convert; |
| 556 | else |
| 557 | ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL); |
| 558 | break; |
| 559 | |
| 560 | default: /* allow null conversion of JCS_UNKNOWN */ |
| 561 | if (cinfo->jpeg_color_space != cinfo->in_color_space || |
| 562 | cinfo->num_components != cinfo->input_components) |
| 563 | ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL); |
| 564 | cconvert->pub.color_convert = null_convert; |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 565 | break; |
| 566 | } |
Thomas G. Lane | 2cbeb8a | 1991-10-07 00:00:00 +0000 | [diff] [blame] | 567 | } |