media/libjpeg/jdmrgext.c@b8a032363ba2 (annotated)
media/libjpeg/jdmrgext.c
Thu, 22 Jan 2015 13:21:57 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 22 Jan 2015 13:21:57 +0100
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
- permissions
- -rw-r--r--
Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6
| michael@0 | 1 | /* |
| michael@0 | 2 | * jdmrgext.c |
| michael@0 | 3 | * |
| michael@0 | 4 | * This file was part of the Independent JPEG Group's software: |
| michael@0 | 5 | * Copyright (C) 1994-1996, Thomas G. Lane. |
| michael@0 | 6 | * libjpeg-turbo Modifications: |
| michael@0 | 7 | * Copyright (C) 2011, D. R. Commander. |
| michael@0 | 8 | * For conditions of distribution and use, see the accompanying README file. |
| michael@0 | 9 | * |
| michael@0 | 10 | * This file contains code for merged upsampling/color conversion. |
| michael@0 | 11 | */ |
| michael@0 | 12 | |
| michael@0 | 13 | |
| michael@0 | 14 | /* This file is included by jdmerge.c */ |
| michael@0 | 15 | |
| michael@0 | 16 | |
| michael@0 | 17 | /* |
| michael@0 | 18 | * Upsample and color convert for the case of 2:1 horizontal and 1:1 vertical. |
| michael@0 | 19 | */ |
| michael@0 | 20 | |
| michael@0 | 21 | INLINE |
| michael@0 | 22 | LOCAL(void) |
| michael@0 | 23 | h2v1_merged_upsample_internal (j_decompress_ptr cinfo, |
| michael@0 | 24 | JSAMPIMAGE input_buf, |
| michael@0 | 25 | JDIMENSION in_row_group_ctr, |
| michael@0 | 26 | JSAMPARRAY output_buf) |
| michael@0 | 27 | { |
| michael@0 | 28 | my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample; |
| michael@0 | 29 | register int y, cred, cgreen, cblue; |
| michael@0 | 30 | int cb, cr; |
| michael@0 | 31 | register JSAMPROW outptr; |
| michael@0 | 32 | JSAMPROW inptr0, inptr1, inptr2; |
| michael@0 | 33 | JDIMENSION col; |
| michael@0 | 34 | /* copy these pointers into registers if possible */ |
| michael@0 | 35 | register JSAMPLE * range_limit = cinfo->sample_range_limit; |
| michael@0 | 36 | int * Crrtab = upsample->Cr_r_tab; |
| michael@0 | 37 | int * Cbbtab = upsample->Cb_b_tab; |
| michael@0 | 38 | INT32 * Crgtab = upsample->Cr_g_tab; |
| michael@0 | 39 | INT32 * Cbgtab = upsample->Cb_g_tab; |
| michael@0 | 40 | SHIFT_TEMPS |
| michael@0 | 41 | |
| michael@0 | 42 | inptr0 = input_buf[0][in_row_group_ctr]; |
| michael@0 | 43 | inptr1 = input_buf[1][in_row_group_ctr]; |
| michael@0 | 44 | inptr2 = input_buf[2][in_row_group_ctr]; |
| michael@0 | 45 | outptr = output_buf[0]; |
| michael@0 | 46 | /* Loop for each pair of output pixels */ |
| michael@0 | 47 | for (col = cinfo->output_width >> 1; col > 0; col--) { |
| michael@0 | 48 | /* Do the chroma part of the calculation */ |
| michael@0 | 49 | cb = GETJSAMPLE(*inptr1++); |
| michael@0 | 50 | cr = GETJSAMPLE(*inptr2++); |
| michael@0 | 51 | cred = Crrtab[cr]; |
| michael@0 | 52 | cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS); |
| michael@0 | 53 | cblue = Cbbtab[cb]; |
| michael@0 | 54 | /* Fetch 2 Y values and emit 2 pixels */ |
| michael@0 | 55 | y = GETJSAMPLE(*inptr0++); |
| michael@0 | 56 | outptr[RGB_RED] = range_limit[y + cred]; |
| michael@0 | 57 | outptr[RGB_GREEN] = range_limit[y + cgreen]; |
| michael@0 | 58 | outptr[RGB_BLUE] = range_limit[y + cblue]; |
| michael@0 | 59 | #ifdef RGB_ALPHA |
| michael@0 | 60 | outptr[RGB_ALPHA] = 0xFF; |
| michael@0 | 61 | #endif |
| michael@0 | 62 | outptr += RGB_PIXELSIZE; |
| michael@0 | 63 | y = GETJSAMPLE(*inptr0++); |
| michael@0 | 64 | outptr[RGB_RED] = range_limit[y + cred]; |
| michael@0 | 65 | outptr[RGB_GREEN] = range_limit[y + cgreen]; |
| michael@0 | 66 | outptr[RGB_BLUE] = range_limit[y + cblue]; |
| michael@0 | 67 | #ifdef RGB_ALPHA |
| michael@0 | 68 | outptr[RGB_ALPHA] = 0xFF; |
| michael@0 | 69 | #endif |
| michael@0 | 70 | outptr += RGB_PIXELSIZE; |
| michael@0 | 71 | } |
| michael@0 | 72 | /* If image width is odd, do the last output column separately */ |
| michael@0 | 73 | if (cinfo->output_width & 1) { |
| michael@0 | 74 | cb = GETJSAMPLE(*inptr1); |
| michael@0 | 75 | cr = GETJSAMPLE(*inptr2); |
| michael@0 | 76 | cred = Crrtab[cr]; |
| michael@0 | 77 | cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS); |
| michael@0 | 78 | cblue = Cbbtab[cb]; |
| michael@0 | 79 | y = GETJSAMPLE(*inptr0); |
| michael@0 | 80 | outptr[RGB_RED] = range_limit[y + cred]; |
| michael@0 | 81 | outptr[RGB_GREEN] = range_limit[y + cgreen]; |
| michael@0 | 82 | outptr[RGB_BLUE] = range_limit[y + cblue]; |
| michael@0 | 83 | #ifdef RGB_ALPHA |
| michael@0 | 84 | outptr[RGB_ALPHA] = 0xFF; |
| michael@0 | 85 | #endif |
| michael@0 | 86 | } |
| michael@0 | 87 | } |
| michael@0 | 88 | |
| michael@0 | 89 | |
| michael@0 | 90 | /* |
| michael@0 | 91 | * Upsample and color convert for the case of 2:1 horizontal and 2:1 vertical. |
| michael@0 | 92 | */ |
| michael@0 | 93 | |
| michael@0 | 94 | INLINE |
| michael@0 | 95 | LOCAL(void) |
| michael@0 | 96 | h2v2_merged_upsample_internal (j_decompress_ptr cinfo, |
| michael@0 | 97 | JSAMPIMAGE input_buf, |
| michael@0 | 98 | JDIMENSION in_row_group_ctr, |
| michael@0 | 99 | JSAMPARRAY output_buf) |
| michael@0 | 100 | { |
| michael@0 | 101 | my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample; |
| michael@0 | 102 | register int y, cred, cgreen, cblue; |
| michael@0 | 103 | int cb, cr; |
| michael@0 | 104 | register JSAMPROW outptr0, outptr1; |
| michael@0 | 105 | JSAMPROW inptr00, inptr01, inptr1, inptr2; |
| michael@0 | 106 | JDIMENSION col; |
| michael@0 | 107 | /* copy these pointers into registers if possible */ |
| michael@0 | 108 | register JSAMPLE * range_limit = cinfo->sample_range_limit; |
| michael@0 | 109 | int * Crrtab = upsample->Cr_r_tab; |
| michael@0 | 110 | int * Cbbtab = upsample->Cb_b_tab; |
| michael@0 | 111 | INT32 * Crgtab = upsample->Cr_g_tab; |
| michael@0 | 112 | INT32 * Cbgtab = upsample->Cb_g_tab; |
| michael@0 | 113 | SHIFT_TEMPS |
| michael@0 | 114 | |
| michael@0 | 115 | inptr00 = input_buf[0][in_row_group_ctr*2]; |
| michael@0 | 116 | inptr01 = input_buf[0][in_row_group_ctr*2 + 1]; |
| michael@0 | 117 | inptr1 = input_buf[1][in_row_group_ctr]; |
| michael@0 | 118 | inptr2 = input_buf[2][in_row_group_ctr]; |
| michael@0 | 119 | outptr0 = output_buf[0]; |
| michael@0 | 120 | outptr1 = output_buf[1]; |
| michael@0 | 121 | /* Loop for each group of output pixels */ |
| michael@0 | 122 | for (col = cinfo->output_width >> 1; col > 0; col--) { |
| michael@0 | 123 | /* Do the chroma part of the calculation */ |
| michael@0 | 124 | cb = GETJSAMPLE(*inptr1++); |
| michael@0 | 125 | cr = GETJSAMPLE(*inptr2++); |
| michael@0 | 126 | cred = Crrtab[cr]; |
| michael@0 | 127 | cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS); |
| michael@0 | 128 | cblue = Cbbtab[cb]; |
| michael@0 | 129 | /* Fetch 4 Y values and emit 4 pixels */ |
| michael@0 | 130 | y = GETJSAMPLE(*inptr00++); |
| michael@0 | 131 | outptr0[RGB_RED] = range_limit[y + cred]; |
| michael@0 | 132 | outptr0[RGB_GREEN] = range_limit[y + cgreen]; |
| michael@0 | 133 | outptr0[RGB_BLUE] = range_limit[y + cblue]; |
| michael@0 | 134 | #ifdef RGB_ALPHA |
| michael@0 | 135 | outptr0[RGB_ALPHA] = 0xFF; |
| michael@0 | 136 | #endif |
| michael@0 | 137 | outptr0 += RGB_PIXELSIZE; |
| michael@0 | 138 | y = GETJSAMPLE(*inptr00++); |
| michael@0 | 139 | outptr0[RGB_RED] = range_limit[y + cred]; |
| michael@0 | 140 | outptr0[RGB_GREEN] = range_limit[y + cgreen]; |
| michael@0 | 141 | outptr0[RGB_BLUE] = range_limit[y + cblue]; |
| michael@0 | 142 | #ifdef RGB_ALPHA |
| michael@0 | 143 | outptr0[RGB_ALPHA] = 0xFF; |
| michael@0 | 144 | #endif |
| michael@0 | 145 | outptr0 += RGB_PIXELSIZE; |
| michael@0 | 146 | y = GETJSAMPLE(*inptr01++); |
| michael@0 | 147 | outptr1[RGB_RED] = range_limit[y + cred]; |
| michael@0 | 148 | outptr1[RGB_GREEN] = range_limit[y + cgreen]; |
| michael@0 | 149 | outptr1[RGB_BLUE] = range_limit[y + cblue]; |
| michael@0 | 150 | #ifdef RGB_ALPHA |
| michael@0 | 151 | outptr1[RGB_ALPHA] = 0xFF; |
| michael@0 | 152 | #endif |
| michael@0 | 153 | outptr1 += RGB_PIXELSIZE; |
| michael@0 | 154 | y = GETJSAMPLE(*inptr01++); |
| michael@0 | 155 | outptr1[RGB_RED] = range_limit[y + cred]; |
| michael@0 | 156 | outptr1[RGB_GREEN] = range_limit[y + cgreen]; |
| michael@0 | 157 | outptr1[RGB_BLUE] = range_limit[y + cblue]; |
| michael@0 | 158 | #ifdef RGB_ALPHA |
| michael@0 | 159 | outptr1[RGB_ALPHA] = 0xFF; |
| michael@0 | 160 | #endif |
| michael@0 | 161 | outptr1 += RGB_PIXELSIZE; |
| michael@0 | 162 | } |
| michael@0 | 163 | /* If image width is odd, do the last output column separately */ |
| michael@0 | 164 | if (cinfo->output_width & 1) { |
| michael@0 | 165 | cb = GETJSAMPLE(*inptr1); |
| michael@0 | 166 | cr = GETJSAMPLE(*inptr2); |
| michael@0 | 167 | cred = Crrtab[cr]; |
| michael@0 | 168 | cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS); |
| michael@0 | 169 | cblue = Cbbtab[cb]; |
| michael@0 | 170 | y = GETJSAMPLE(*inptr00); |
| michael@0 | 171 | outptr0[RGB_RED] = range_limit[y + cred]; |
| michael@0 | 172 | outptr0[RGB_GREEN] = range_limit[y + cgreen]; |
| michael@0 | 173 | outptr0[RGB_BLUE] = range_limit[y + cblue]; |
| michael@0 | 174 | #ifdef RGB_ALPHA |
| michael@0 | 175 | outptr0[RGB_ALPHA] = 0xFF; |
| michael@0 | 176 | #endif |
| michael@0 | 177 | y = GETJSAMPLE(*inptr01); |
| michael@0 | 178 | outptr1[RGB_RED] = range_limit[y + cred]; |
| michael@0 | 179 | outptr1[RGB_GREEN] = range_limit[y + cgreen]; |
| michael@0 | 180 | outptr1[RGB_BLUE] = range_limit[y + cblue]; |
| michael@0 | 181 | #ifdef RGB_ALPHA |
| michael@0 | 182 | outptr1[RGB_ALPHA] = 0xFF; |
| michael@0 | 183 | #endif |
| michael@0 | 184 | } |
| michael@0 | 185 | } |
