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comparison: media/libjpeg/jdmrgext.c
media/libjpeg/jdmrgext.c
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:518070acfbea |
|---|---|
| 1 /* | |
| 2 * jdmrgext.c | |
| 3 * | |
| 4 * This file was part of the Independent JPEG Group's software: | |
| 5 * Copyright (C) 1994-1996, Thomas G. Lane. | |
| 6 * libjpeg-turbo Modifications: | |
| 7 * Copyright (C) 2011, D. R. Commander. | |
| 8 * For conditions of distribution and use, see the accompanying README file. | |
| 9 * | |
| 10 * This file contains code for merged upsampling/color conversion. | |
| 11 */ | |
| 12 | |
| 13 | |
| 14 /* This file is included by jdmerge.c */ | |
| 15 | |
| 16 | |
| 17 /* | |
| 18 * Upsample and color convert for the case of 2:1 horizontal and 1:1 vertical. | |
| 19 */ | |
| 20 | |
| 21 INLINE | |
| 22 LOCAL(void) | |
| 23 h2v1_merged_upsample_internal (j_decompress_ptr cinfo, | |
| 24 JSAMPIMAGE input_buf, | |
| 25 JDIMENSION in_row_group_ctr, | |
| 26 JSAMPARRAY output_buf) | |
| 27 { | |
| 28 my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample; | |
| 29 register int y, cred, cgreen, cblue; | |
| 30 int cb, cr; | |
| 31 register JSAMPROW outptr; | |
| 32 JSAMPROW inptr0, inptr1, inptr2; | |
| 33 JDIMENSION col; | |
| 34 /* copy these pointers into registers if possible */ | |
| 35 register JSAMPLE * range_limit = cinfo->sample_range_limit; | |
| 36 int * Crrtab = upsample->Cr_r_tab; | |
| 37 int * Cbbtab = upsample->Cb_b_tab; | |
| 38 INT32 * Crgtab = upsample->Cr_g_tab; | |
| 39 INT32 * Cbgtab = upsample->Cb_g_tab; | |
| 40 SHIFT_TEMPS | |
| 41 | |
| 42 inptr0 = input_buf[0][in_row_group_ctr]; | |
| 43 inptr1 = input_buf[1][in_row_group_ctr]; | |
| 44 inptr2 = input_buf[2][in_row_group_ctr]; | |
| 45 outptr = output_buf[0]; | |
| 46 /* Loop for each pair of output pixels */ | |
| 47 for (col = cinfo->output_width >> 1; col > 0; col--) { | |
| 48 /* Do the chroma part of the calculation */ | |
| 49 cb = GETJSAMPLE(*inptr1++); | |
| 50 cr = GETJSAMPLE(*inptr2++); | |
| 51 cred = Crrtab[cr]; | |
| 52 cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS); | |
| 53 cblue = Cbbtab[cb]; | |
| 54 /* Fetch 2 Y values and emit 2 pixels */ | |
| 55 y = GETJSAMPLE(*inptr0++); | |
| 56 outptr[RGB_RED] = range_limit[y + cred]; | |
| 57 outptr[RGB_GREEN] = range_limit[y + cgreen]; | |
| 58 outptr[RGB_BLUE] = range_limit[y + cblue]; | |
| 59 #ifdef RGB_ALPHA | |
| 60 outptr[RGB_ALPHA] = 0xFF; | |
| 61 #endif | |
| 62 outptr += RGB_PIXELSIZE; | |
| 63 y = GETJSAMPLE(*inptr0++); | |
| 64 outptr[RGB_RED] = range_limit[y + cred]; | |
| 65 outptr[RGB_GREEN] = range_limit[y + cgreen]; | |
| 66 outptr[RGB_BLUE] = range_limit[y + cblue]; | |
| 67 #ifdef RGB_ALPHA | |
| 68 outptr[RGB_ALPHA] = 0xFF; | |
| 69 #endif | |
| 70 outptr += RGB_PIXELSIZE; | |
| 71 } | |
| 72 /* If image width is odd, do the last output column separately */ | |
| 73 if (cinfo->output_width & 1) { | |
| 74 cb = GETJSAMPLE(*inptr1); | |
| 75 cr = GETJSAMPLE(*inptr2); | |
| 76 cred = Crrtab[cr]; | |
| 77 cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS); | |
| 78 cblue = Cbbtab[cb]; | |
| 79 y = GETJSAMPLE(*inptr0); | |
| 80 outptr[RGB_RED] = range_limit[y + cred]; | |
| 81 outptr[RGB_GREEN] = range_limit[y + cgreen]; | |
| 82 outptr[RGB_BLUE] = range_limit[y + cblue]; | |
| 83 #ifdef RGB_ALPHA | |
| 84 outptr[RGB_ALPHA] = 0xFF; | |
| 85 #endif | |
| 86 } | |
| 87 } | |
| 88 | |
| 89 | |
| 90 /* | |
| 91 * Upsample and color convert for the case of 2:1 horizontal and 2:1 vertical. | |
| 92 */ | |
| 93 | |
| 94 INLINE | |
| 95 LOCAL(void) | |
| 96 h2v2_merged_upsample_internal (j_decompress_ptr cinfo, | |
| 97 JSAMPIMAGE input_buf, | |
| 98 JDIMENSION in_row_group_ctr, | |
| 99 JSAMPARRAY output_buf) | |
| 100 { | |
| 101 my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample; | |
| 102 register int y, cred, cgreen, cblue; | |
| 103 int cb, cr; | |
| 104 register JSAMPROW outptr0, outptr1; | |
| 105 JSAMPROW inptr00, inptr01, inptr1, inptr2; | |
| 106 JDIMENSION col; | |
| 107 /* copy these pointers into registers if possible */ | |
| 108 register JSAMPLE * range_limit = cinfo->sample_range_limit; | |
| 109 int * Crrtab = upsample->Cr_r_tab; | |
| 110 int * Cbbtab = upsample->Cb_b_tab; | |
| 111 INT32 * Crgtab = upsample->Cr_g_tab; | |
| 112 INT32 * Cbgtab = upsample->Cb_g_tab; | |
| 113 SHIFT_TEMPS | |
| 114 | |
| 115 inptr00 = input_buf[0][in_row_group_ctr*2]; | |
| 116 inptr01 = input_buf[0][in_row_group_ctr*2 + 1]; | |
| 117 inptr1 = input_buf[1][in_row_group_ctr]; | |
| 118 inptr2 = input_buf[2][in_row_group_ctr]; | |
| 119 outptr0 = output_buf[0]; | |
| 120 outptr1 = output_buf[1]; | |
| 121 /* Loop for each group of output pixels */ | |
| 122 for (col = cinfo->output_width >> 1; col > 0; col--) { | |
| 123 /* Do the chroma part of the calculation */ | |
| 124 cb = GETJSAMPLE(*inptr1++); | |
| 125 cr = GETJSAMPLE(*inptr2++); | |
| 126 cred = Crrtab[cr]; | |
| 127 cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS); | |
| 128 cblue = Cbbtab[cb]; | |
| 129 /* Fetch 4 Y values and emit 4 pixels */ | |
| 130 y = GETJSAMPLE(*inptr00++); | |
| 131 outptr0[RGB_RED] = range_limit[y + cred]; | |
| 132 outptr0[RGB_GREEN] = range_limit[y + cgreen]; | |
| 133 outptr0[RGB_BLUE] = range_limit[y + cblue]; | |
| 134 #ifdef RGB_ALPHA | |
| 135 outptr0[RGB_ALPHA] = 0xFF; | |
| 136 #endif | |
| 137 outptr0 += RGB_PIXELSIZE; | |
| 138 y = GETJSAMPLE(*inptr00++); | |
| 139 outptr0[RGB_RED] = range_limit[y + cred]; | |
| 140 outptr0[RGB_GREEN] = range_limit[y + cgreen]; | |
| 141 outptr0[RGB_BLUE] = range_limit[y + cblue]; | |
| 142 #ifdef RGB_ALPHA | |
| 143 outptr0[RGB_ALPHA] = 0xFF; | |
| 144 #endif | |
| 145 outptr0 += RGB_PIXELSIZE; | |
| 146 y = GETJSAMPLE(*inptr01++); | |
| 147 outptr1[RGB_RED] = range_limit[y + cred]; | |
| 148 outptr1[RGB_GREEN] = range_limit[y + cgreen]; | |
| 149 outptr1[RGB_BLUE] = range_limit[y + cblue]; | |
| 150 #ifdef RGB_ALPHA | |
| 151 outptr1[RGB_ALPHA] = 0xFF; | |
| 152 #endif | |
| 153 outptr1 += RGB_PIXELSIZE; | |
| 154 y = GETJSAMPLE(*inptr01++); | |
| 155 outptr1[RGB_RED] = range_limit[y + cred]; | |
| 156 outptr1[RGB_GREEN] = range_limit[y + cgreen]; | |
| 157 outptr1[RGB_BLUE] = range_limit[y + cblue]; | |
| 158 #ifdef RGB_ALPHA | |
| 159 outptr1[RGB_ALPHA] = 0xFF; | |
| 160 #endif | |
| 161 outptr1 += RGB_PIXELSIZE; | |
| 162 } | |
| 163 /* If image width is odd, do the last output column separately */ | |
| 164 if (cinfo->output_width & 1) { | |
| 165 cb = GETJSAMPLE(*inptr1); | |
| 166 cr = GETJSAMPLE(*inptr2); | |
| 167 cred = Crrtab[cr]; | |
| 168 cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS); | |
| 169 cblue = Cbbtab[cb]; | |
| 170 y = GETJSAMPLE(*inptr00); | |
| 171 outptr0[RGB_RED] = range_limit[y + cred]; | |
| 172 outptr0[RGB_GREEN] = range_limit[y + cgreen]; | |
| 173 outptr0[RGB_BLUE] = range_limit[y + cblue]; | |
| 174 #ifdef RGB_ALPHA | |
| 175 outptr0[RGB_ALPHA] = 0xFF; | |
| 176 #endif | |
| 177 y = GETJSAMPLE(*inptr01); | |
| 178 outptr1[RGB_RED] = range_limit[y + cred]; | |
| 179 outptr1[RGB_GREEN] = range_limit[y + cgreen]; | |
| 180 outptr1[RGB_BLUE] = range_limit[y + cblue]; | |
| 181 #ifdef RGB_ALPHA | |
| 182 outptr1[RGB_ALPHA] = 0xFF; | |
| 183 #endif | |
| 184 } | |
| 185 } |
