DRC | b4570bb | 2011-09-07 06:31:00 +0000 | [diff] [blame] | 1 | /* |
| 2 | * jdmrgext.c |
| 3 | * |
DRC | a73e870 | 2012-12-31 02:52:30 +0000 | [diff] [blame] | 4 | * This file was part of the Independent JPEG Group's software: |
DRC | b4570bb | 2011-09-07 06:31:00 +0000 | [diff] [blame] | 5 | * Copyright (C) 1994-1996, Thomas G. Lane. |
DRC | a6ef282 | 2013-09-28 03:23:49 +0000 | [diff] [blame] | 6 | * libjpeg-turbo Modifications: |
DRC | 1e32fe3 | 2015-10-14 17:32:39 -0500 | [diff] [blame] | 7 | * Copyright (C) 2011, 2015, D. R. Commander. |
DRC | 7e3acc0 | 2015-10-10 10:25:46 -0500 | [diff] [blame] | 8 | * For conditions of distribution and use, see the accompanying README.ijg |
| 9 | * file. |
DRC | b4570bb | 2011-09-07 06:31:00 +0000 | [diff] [blame] | 10 | * |
| 11 | * This file contains code for merged upsampling/color conversion. |
| 12 | */ |
| 13 | |
| 14 | |
| 15 | /* This file is included by jdmerge.c */ |
| 16 | |
| 17 | |
| 18 | /* |
| 19 | * Upsample and color convert for the case of 2:1 horizontal and 1:1 vertical. |
| 20 | */ |
| 21 | |
| 22 | INLINE |
| 23 | LOCAL(void) |
| 24 | h2v1_merged_upsample_internal (j_decompress_ptr cinfo, |
| 25 | JSAMPIMAGE input_buf, |
| 26 | JDIMENSION in_row_group_ctr, |
| 27 | JSAMPARRAY output_buf) |
| 28 | { |
| 29 | my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample; |
| 30 | register int y, cred, cgreen, cblue; |
| 31 | int cb, cr; |
| 32 | register JSAMPROW outptr; |
| 33 | JSAMPROW inptr0, inptr1, inptr2; |
| 34 | JDIMENSION col; |
| 35 | /* copy these pointers into registers if possible */ |
| 36 | register JSAMPLE * range_limit = cinfo->sample_range_limit; |
| 37 | int * Crrtab = upsample->Cr_r_tab; |
| 38 | int * Cbbtab = upsample->Cb_b_tab; |
DRC | 1e32fe3 | 2015-10-14 17:32:39 -0500 | [diff] [blame] | 39 | JLONG * Crgtab = upsample->Cr_g_tab; |
| 40 | JLONG * Cbgtab = upsample->Cb_g_tab; |
DRC | b4570bb | 2011-09-07 06:31:00 +0000 | [diff] [blame] | 41 | SHIFT_TEMPS |
| 42 | |
| 43 | inptr0 = input_buf[0][in_row_group_ctr]; |
| 44 | inptr1 = input_buf[1][in_row_group_ctr]; |
| 45 | inptr2 = input_buf[2][in_row_group_ctr]; |
| 46 | outptr = output_buf[0]; |
| 47 | /* Loop for each pair of output pixels */ |
| 48 | for (col = cinfo->output_width >> 1; col > 0; col--) { |
| 49 | /* Do the chroma part of the calculation */ |
| 50 | cb = GETJSAMPLE(*inptr1++); |
| 51 | cr = GETJSAMPLE(*inptr2++); |
| 52 | cred = Crrtab[cr]; |
| 53 | cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS); |
| 54 | cblue = Cbbtab[cb]; |
| 55 | /* Fetch 2 Y values and emit 2 pixels */ |
| 56 | y = GETJSAMPLE(*inptr0++); |
| 57 | outptr[RGB_RED] = range_limit[y + cred]; |
| 58 | outptr[RGB_GREEN] = range_limit[y + cgreen]; |
| 59 | outptr[RGB_BLUE] = range_limit[y + cblue]; |
DRC | cac1051 | 2012-03-16 14:37:36 +0000 | [diff] [blame] | 60 | #ifdef RGB_ALPHA |
| 61 | outptr[RGB_ALPHA] = 0xFF; |
| 62 | #endif |
DRC | b4570bb | 2011-09-07 06:31:00 +0000 | [diff] [blame] | 63 | outptr += RGB_PIXELSIZE; |
| 64 | y = GETJSAMPLE(*inptr0++); |
| 65 | outptr[RGB_RED] = range_limit[y + cred]; |
| 66 | outptr[RGB_GREEN] = range_limit[y + cgreen]; |
| 67 | outptr[RGB_BLUE] = range_limit[y + cblue]; |
DRC | cac1051 | 2012-03-16 14:37:36 +0000 | [diff] [blame] | 68 | #ifdef RGB_ALPHA |
| 69 | outptr[RGB_ALPHA] = 0xFF; |
| 70 | #endif |
DRC | b4570bb | 2011-09-07 06:31:00 +0000 | [diff] [blame] | 71 | outptr += RGB_PIXELSIZE; |
| 72 | } |
| 73 | /* If image width is odd, do the last output column separately */ |
| 74 | if (cinfo->output_width & 1) { |
| 75 | cb = GETJSAMPLE(*inptr1); |
| 76 | cr = GETJSAMPLE(*inptr2); |
| 77 | cred = Crrtab[cr]; |
| 78 | cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS); |
| 79 | cblue = Cbbtab[cb]; |
| 80 | y = GETJSAMPLE(*inptr0); |
| 81 | outptr[RGB_RED] = range_limit[y + cred]; |
| 82 | outptr[RGB_GREEN] = range_limit[y + cgreen]; |
| 83 | outptr[RGB_BLUE] = range_limit[y + cblue]; |
DRC | cac1051 | 2012-03-16 14:37:36 +0000 | [diff] [blame] | 84 | #ifdef RGB_ALPHA |
| 85 | outptr[RGB_ALPHA] = 0xFF; |
| 86 | #endif |
DRC | b4570bb | 2011-09-07 06:31:00 +0000 | [diff] [blame] | 87 | } |
| 88 | } |
| 89 | |
| 90 | |
| 91 | /* |
| 92 | * Upsample and color convert for the case of 2:1 horizontal and 2:1 vertical. |
| 93 | */ |
| 94 | |
| 95 | INLINE |
| 96 | LOCAL(void) |
| 97 | h2v2_merged_upsample_internal (j_decompress_ptr cinfo, |
| 98 | JSAMPIMAGE input_buf, |
| 99 | JDIMENSION in_row_group_ctr, |
| 100 | JSAMPARRAY output_buf) |
| 101 | { |
| 102 | my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample; |
| 103 | register int y, cred, cgreen, cblue; |
| 104 | int cb, cr; |
| 105 | register JSAMPROW outptr0, outptr1; |
| 106 | JSAMPROW inptr00, inptr01, inptr1, inptr2; |
| 107 | JDIMENSION col; |
| 108 | /* copy these pointers into registers if possible */ |
| 109 | register JSAMPLE * range_limit = cinfo->sample_range_limit; |
| 110 | int * Crrtab = upsample->Cr_r_tab; |
| 111 | int * Cbbtab = upsample->Cb_b_tab; |
DRC | 1e32fe3 | 2015-10-14 17:32:39 -0500 | [diff] [blame] | 112 | JLONG * Crgtab = upsample->Cr_g_tab; |
| 113 | JLONG * Cbgtab = upsample->Cb_g_tab; |
DRC | b4570bb | 2011-09-07 06:31:00 +0000 | [diff] [blame] | 114 | SHIFT_TEMPS |
| 115 | |
| 116 | inptr00 = input_buf[0][in_row_group_ctr*2]; |
| 117 | inptr01 = input_buf[0][in_row_group_ctr*2 + 1]; |
| 118 | inptr1 = input_buf[1][in_row_group_ctr]; |
| 119 | inptr2 = input_buf[2][in_row_group_ctr]; |
| 120 | outptr0 = output_buf[0]; |
| 121 | outptr1 = output_buf[1]; |
| 122 | /* Loop for each group of output pixels */ |
| 123 | for (col = cinfo->output_width >> 1; col > 0; col--) { |
| 124 | /* Do the chroma part of the calculation */ |
| 125 | cb = GETJSAMPLE(*inptr1++); |
| 126 | cr = GETJSAMPLE(*inptr2++); |
| 127 | cred = Crrtab[cr]; |
| 128 | cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS); |
| 129 | cblue = Cbbtab[cb]; |
| 130 | /* Fetch 4 Y values and emit 4 pixels */ |
| 131 | y = GETJSAMPLE(*inptr00++); |
| 132 | outptr0[RGB_RED] = range_limit[y + cred]; |
| 133 | outptr0[RGB_GREEN] = range_limit[y + cgreen]; |
| 134 | outptr0[RGB_BLUE] = range_limit[y + cblue]; |
DRC | cac1051 | 2012-03-16 14:37:36 +0000 | [diff] [blame] | 135 | #ifdef RGB_ALPHA |
| 136 | outptr0[RGB_ALPHA] = 0xFF; |
| 137 | #endif |
DRC | b4570bb | 2011-09-07 06:31:00 +0000 | [diff] [blame] | 138 | outptr0 += RGB_PIXELSIZE; |
| 139 | y = GETJSAMPLE(*inptr00++); |
| 140 | outptr0[RGB_RED] = range_limit[y + cred]; |
| 141 | outptr0[RGB_GREEN] = range_limit[y + cgreen]; |
| 142 | outptr0[RGB_BLUE] = range_limit[y + cblue]; |
DRC | cac1051 | 2012-03-16 14:37:36 +0000 | [diff] [blame] | 143 | #ifdef RGB_ALPHA |
| 144 | outptr0[RGB_ALPHA] = 0xFF; |
| 145 | #endif |
DRC | b4570bb | 2011-09-07 06:31:00 +0000 | [diff] [blame] | 146 | outptr0 += RGB_PIXELSIZE; |
| 147 | y = GETJSAMPLE(*inptr01++); |
| 148 | outptr1[RGB_RED] = range_limit[y + cred]; |
| 149 | outptr1[RGB_GREEN] = range_limit[y + cgreen]; |
| 150 | outptr1[RGB_BLUE] = range_limit[y + cblue]; |
DRC | cac1051 | 2012-03-16 14:37:36 +0000 | [diff] [blame] | 151 | #ifdef RGB_ALPHA |
| 152 | outptr1[RGB_ALPHA] = 0xFF; |
| 153 | #endif |
DRC | b4570bb | 2011-09-07 06:31:00 +0000 | [diff] [blame] | 154 | outptr1 += RGB_PIXELSIZE; |
| 155 | y = GETJSAMPLE(*inptr01++); |
| 156 | outptr1[RGB_RED] = range_limit[y + cred]; |
| 157 | outptr1[RGB_GREEN] = range_limit[y + cgreen]; |
| 158 | outptr1[RGB_BLUE] = range_limit[y + cblue]; |
DRC | cac1051 | 2012-03-16 14:37:36 +0000 | [diff] [blame] | 159 | #ifdef RGB_ALPHA |
| 160 | outptr1[RGB_ALPHA] = 0xFF; |
| 161 | #endif |
DRC | b4570bb | 2011-09-07 06:31:00 +0000 | [diff] [blame] | 162 | outptr1 += RGB_PIXELSIZE; |
| 163 | } |
| 164 | /* If image width is odd, do the last output column separately */ |
| 165 | if (cinfo->output_width & 1) { |
| 166 | cb = GETJSAMPLE(*inptr1); |
| 167 | cr = GETJSAMPLE(*inptr2); |
| 168 | cred = Crrtab[cr]; |
| 169 | cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS); |
| 170 | cblue = Cbbtab[cb]; |
| 171 | y = GETJSAMPLE(*inptr00); |
| 172 | outptr0[RGB_RED] = range_limit[y + cred]; |
| 173 | outptr0[RGB_GREEN] = range_limit[y + cgreen]; |
| 174 | outptr0[RGB_BLUE] = range_limit[y + cblue]; |
DRC | cac1051 | 2012-03-16 14:37:36 +0000 | [diff] [blame] | 175 | #ifdef RGB_ALPHA |
| 176 | outptr0[RGB_ALPHA] = 0xFF; |
| 177 | #endif |
DRC | b4570bb | 2011-09-07 06:31:00 +0000 | [diff] [blame] | 178 | y = GETJSAMPLE(*inptr01); |
| 179 | outptr1[RGB_RED] = range_limit[y + cred]; |
| 180 | outptr1[RGB_GREEN] = range_limit[y + cgreen]; |
| 181 | outptr1[RGB_BLUE] = range_limit[y + cblue]; |
DRC | cac1051 | 2012-03-16 14:37:36 +0000 | [diff] [blame] | 182 | #ifdef RGB_ALPHA |
| 183 | outptr1[RGB_ALPHA] = 0xFF; |
| 184 | #endif |
DRC | b4570bb | 2011-09-07 06:31:00 +0000 | [diff] [blame] | 185 | } |
| 186 | } |