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1 /* | 1 /* |
2 * jccolext.c | 2 * jccolext.c |
3 * | 3 * |
4 * This file was part of the Independent JPEG Group's software: | 4 * This file was part of the Independent JPEG Group's software: |
5 * Copyright (C) 1991-1996, Thomas G. Lane. | 5 * Copyright (C) 1991-1996, Thomas G. Lane. |
6 * libjpeg-turbo Modifications: | 6 * libjpeg-turbo Modifications: |
7 * Copyright (C) 2009-2012, D. R. Commander. | 7 * Copyright (C) 2009-2012, 2015, D. R. Commander. |
8 * For conditions of distribution and use, see the accompanying README file. | 8 * For conditions of distribution and use, see the accompanying README.ijg |
| 9 * file. |
9 * | 10 * |
10 * This file contains input colorspace conversion routines. | 11 * This file contains input colorspace conversion routines. |
11 */ | 12 */ |
12 | 13 |
13 | 14 |
14 /* This file is included by jccolor.c */ | 15 /* This file is included by jccolor.c */ |
15 | 16 |
16 | 17 |
17 /* | 18 /* |
18 * Convert some rows of samples to the JPEG colorspace. | 19 * Convert some rows of samples to the JPEG colorspace. |
19 * | 20 * |
20 * Note that we change from the application's interleaved-pixel format | 21 * Note that we change from the application's interleaved-pixel format |
21 * to our internal noninterleaved, one-plane-per-component format. | 22 * to our internal noninterleaved, one-plane-per-component format. |
22 * The input buffer is therefore three times as wide as the output buffer. | 23 * The input buffer is therefore three times as wide as the output buffer. |
23 * | 24 * |
24 * A starting row offset is provided only for the output buffer. The caller | 25 * 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 * can easily adjust the passed input_buf value to accommodate any row |
26 * offset required on that side. | 27 * offset required on that side. |
27 */ | 28 */ |
28 | 29 |
29 INLINE | 30 INLINE |
30 LOCAL(void) | 31 LOCAL(void) |
31 rgb_ycc_convert_internal (j_compress_ptr cinfo, | 32 rgb_ycc_convert_internal (j_compress_ptr cinfo, |
32 JSAMPARRAY input_buf, JSAMPIMAGE output_buf, | 33 JSAMPARRAY input_buf, JSAMPIMAGE output_buf, |
33 JDIMENSION output_row, int num_rows) | 34 JDIMENSION output_row, int num_rows) |
34 { | 35 { |
35 my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert; | 36 my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert; |
36 register int r, g, b; | 37 register int r, g, b; |
37 register INT32 * ctab = cconvert->rgb_ycc_tab; | 38 register JLONG * ctab = cconvert->rgb_ycc_tab; |
38 register JSAMPROW inptr; | 39 register JSAMPROW inptr; |
39 register JSAMPROW outptr0, outptr1, outptr2; | 40 register JSAMPROW outptr0, outptr1, outptr2; |
40 register JDIMENSION col; | 41 register JDIMENSION col; |
41 JDIMENSION num_cols = cinfo->image_width; | 42 JDIMENSION num_cols = cinfo->image_width; |
42 | 43 |
43 while (--num_rows >= 0) { | 44 while (--num_rows >= 0) { |
44 inptr = *input_buf++; | 45 inptr = *input_buf++; |
45 outptr0 = output_buf[0][output_row]; | 46 outptr0 = output_buf[0][output_row]; |
46 outptr1 = output_buf[1][output_row]; | 47 outptr1 = output_buf[1][output_row]; |
47 outptr2 = output_buf[2][output_row]; | 48 outptr2 = output_buf[2][output_row]; |
48 output_row++; | 49 output_row++; |
49 for (col = 0; col < num_cols; col++) { | 50 for (col = 0; col < num_cols; col++) { |
50 r = GETJSAMPLE(inptr[RGB_RED]); | 51 r = GETJSAMPLE(inptr[RGB_RED]); |
51 g = GETJSAMPLE(inptr[RGB_GREEN]); | 52 g = GETJSAMPLE(inptr[RGB_GREEN]); |
52 b = GETJSAMPLE(inptr[RGB_BLUE]); | 53 b = GETJSAMPLE(inptr[RGB_BLUE]); |
53 inptr += RGB_PIXELSIZE; | 54 inptr += RGB_PIXELSIZE; |
54 /* If the inputs are 0..MAXJSAMPLE, the outputs of these equations | 55 /* 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 * 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 * Hence the value being shifted is never negative, and we don't |
57 * need the general RIGHT_SHIFT macro. | 58 * need the general RIGHT_SHIFT macro. |
58 */ | 59 */ |
59 /* Y */ | 60 /* Y */ |
60 outptr0[col] = (JSAMPLE) | 61 outptr0[col] = (JSAMPLE) |
61 » » ((ctab[r+R_Y_OFF] + ctab[g+G_Y_OFF] + ctab[b+B_Y_OFF]) | 62 ((ctab[r+R_Y_OFF] + ctab[g+G_Y_OFF] + ctab[b+B_Y_OFF]) |
62 » » >> SCALEBITS); | 63 >> SCALEBITS); |
63 /* Cb */ | 64 /* Cb */ |
64 outptr1[col] = (JSAMPLE) | 65 outptr1[col] = (JSAMPLE) |
65 » » ((ctab[r+R_CB_OFF] + ctab[g+G_CB_OFF] + ctab[b+B_CB_OFF]) | 66 ((ctab[r+R_CB_OFF] + ctab[g+G_CB_OFF] + ctab[b+B_CB_OFF]) |
66 » » >> SCALEBITS); | 67 >> SCALEBITS); |
67 /* Cr */ | 68 /* Cr */ |
68 outptr2[col] = (JSAMPLE) | 69 outptr2[col] = (JSAMPLE) |
69 » » ((ctab[r+R_CR_OFF] + ctab[g+G_CR_OFF] + ctab[b+B_CR_OFF]) | 70 ((ctab[r+R_CR_OFF] + ctab[g+G_CR_OFF] + ctab[b+B_CR_OFF]) |
70 » » >> SCALEBITS); | 71 >> SCALEBITS); |
71 } | 72 } |
72 } | 73 } |
73 } | 74 } |
74 | 75 |
75 | 76 |
76 /**************** Cases other than RGB -> YCbCr **************/ | 77 /**************** Cases other than RGB -> YCbCr **************/ |
77 | 78 |
78 | 79 |
79 /* | 80 /* |
80 * Convert some rows of samples to the JPEG colorspace. | 81 * Convert some rows of samples to the JPEG colorspace. |
81 * This version handles RGB->grayscale conversion, which is the same | 82 * This version handles RGB->grayscale conversion, which is the same |
82 * as the RGB->Y portion of RGB->YCbCr. | 83 * as the RGB->Y portion of RGB->YCbCr. |
83 * We assume rgb_ycc_start has been called (we only use the Y tables). | 84 * We assume rgb_ycc_start has been called (we only use the Y tables). |
84 */ | 85 */ |
85 | 86 |
86 INLINE | 87 INLINE |
87 LOCAL(void) | 88 LOCAL(void) |
88 rgb_gray_convert_internal (j_compress_ptr cinfo, | 89 rgb_gray_convert_internal (j_compress_ptr cinfo, |
89 JSAMPARRAY input_buf, JSAMPIMAGE output_buf, | 90 JSAMPARRAY input_buf, JSAMPIMAGE output_buf, |
90 JDIMENSION output_row, int num_rows) | 91 JDIMENSION output_row, int num_rows) |
91 { | 92 { |
92 my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert; | 93 my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert; |
93 register int r, g, b; | 94 register int r, g, b; |
94 register INT32 * ctab = cconvert->rgb_ycc_tab; | 95 register JLONG * ctab = cconvert->rgb_ycc_tab; |
95 register JSAMPROW inptr; | 96 register JSAMPROW inptr; |
96 register JSAMPROW outptr; | 97 register JSAMPROW outptr; |
97 register JDIMENSION col; | 98 register JDIMENSION col; |
98 JDIMENSION num_cols = cinfo->image_width; | 99 JDIMENSION num_cols = cinfo->image_width; |
99 | 100 |
100 while (--num_rows >= 0) { | 101 while (--num_rows >= 0) { |
101 inptr = *input_buf++; | 102 inptr = *input_buf++; |
102 outptr = output_buf[0][output_row]; | 103 outptr = output_buf[0][output_row]; |
103 output_row++; | 104 output_row++; |
104 for (col = 0; col < num_cols; col++) { | 105 for (col = 0; col < num_cols; col++) { |
105 r = GETJSAMPLE(inptr[RGB_RED]); | 106 r = GETJSAMPLE(inptr[RGB_RED]); |
106 g = GETJSAMPLE(inptr[RGB_GREEN]); | 107 g = GETJSAMPLE(inptr[RGB_GREEN]); |
107 b = GETJSAMPLE(inptr[RGB_BLUE]); | 108 b = GETJSAMPLE(inptr[RGB_BLUE]); |
108 inptr += RGB_PIXELSIZE; | 109 inptr += RGB_PIXELSIZE; |
109 /* Y */ | 110 /* Y */ |
110 outptr[col] = (JSAMPLE) | 111 outptr[col] = (JSAMPLE) |
111 » » ((ctab[r+R_Y_OFF] + ctab[g+G_Y_OFF] + ctab[b+B_Y_OFF]) | 112 ((ctab[r+R_Y_OFF] + ctab[g+G_Y_OFF] + ctab[b+B_Y_OFF]) |
112 » » >> SCALEBITS); | 113 >> SCALEBITS); |
113 } | 114 } |
114 } | 115 } |
115 } | 116 } |
116 | 117 |
117 | 118 |
118 /* | 119 /* |
119 * Convert some rows of samples to the JPEG colorspace. | 120 * Convert some rows of samples to the JPEG colorspace. |
120 * This version handles extended RGB->plain RGB conversion | 121 * This version handles extended RGB->plain RGB conversion |
121 */ | 122 */ |
122 | 123 |
(...skipping 15 matching lines...) Expand all Loading... |
138 outptr2 = output_buf[2][output_row]; | 139 outptr2 = output_buf[2][output_row]; |
139 output_row++; | 140 output_row++; |
140 for (col = 0; col < num_cols; col++) { | 141 for (col = 0; col < num_cols; col++) { |
141 outptr0[col] = GETJSAMPLE(inptr[RGB_RED]); | 142 outptr0[col] = GETJSAMPLE(inptr[RGB_RED]); |
142 outptr1[col] = GETJSAMPLE(inptr[RGB_GREEN]); | 143 outptr1[col] = GETJSAMPLE(inptr[RGB_GREEN]); |
143 outptr2[col] = GETJSAMPLE(inptr[RGB_BLUE]); | 144 outptr2[col] = GETJSAMPLE(inptr[RGB_BLUE]); |
144 inptr += RGB_PIXELSIZE; | 145 inptr += RGB_PIXELSIZE; |
145 } | 146 } |
146 } | 147 } |
147 } | 148 } |
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