DRC | b4570bb | 2011-09-07 06:31:00 +0000 | [diff] [blame] | 1 | /* |
| 2 | * jdmrgext.c |
| 3 | * |
| 4 | * Copyright (C) 1994-1996, Thomas G. Lane. |
| 5 | * This file is part of the Independent JPEG Group's software. |
| 6 | * For conditions of distribution and use, see the accompanying README file. |
| 7 | * |
| 8 | * This file contains code for merged upsampling/color conversion. |
| 9 | */ |
| 10 | |
| 11 | |
| 12 | /* This file is included by jdmerge.c */ |
| 13 | |
| 14 | |
| 15 | /* |
| 16 | * Upsample and color convert for the case of 2:1 horizontal and 1:1 vertical. |
| 17 | */ |
| 18 | |
| 19 | INLINE |
| 20 | LOCAL(void) |
| 21 | h2v1_merged_upsample_internal (j_decompress_ptr cinfo, |
| 22 | JSAMPIMAGE input_buf, |
| 23 | JDIMENSION in_row_group_ctr, |
| 24 | JSAMPARRAY output_buf) |
| 25 | { |
| 26 | my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample; |
| 27 | register int y, cred, cgreen, cblue; |
| 28 | int cb, cr; |
| 29 | register JSAMPROW outptr; |
| 30 | JSAMPROW inptr0, inptr1, inptr2; |
| 31 | JDIMENSION col; |
| 32 | /* copy these pointers into registers if possible */ |
| 33 | register JSAMPLE * range_limit = cinfo->sample_range_limit; |
| 34 | int * Crrtab = upsample->Cr_r_tab; |
| 35 | int * Cbbtab = upsample->Cb_b_tab; |
| 36 | INT32 * Crgtab = upsample->Cr_g_tab; |
| 37 | INT32 * Cbgtab = upsample->Cb_g_tab; |
| 38 | SHIFT_TEMPS |
| 39 | |
| 40 | inptr0 = input_buf[0][in_row_group_ctr]; |
| 41 | inptr1 = input_buf[1][in_row_group_ctr]; |
| 42 | inptr2 = input_buf[2][in_row_group_ctr]; |
| 43 | outptr = output_buf[0]; |
| 44 | /* Loop for each pair of output pixels */ |
| 45 | for (col = cinfo->output_width >> 1; col > 0; col--) { |
| 46 | /* Do the chroma part of the calculation */ |
| 47 | cb = GETJSAMPLE(*inptr1++); |
| 48 | cr = GETJSAMPLE(*inptr2++); |
| 49 | cred = Crrtab[cr]; |
| 50 | cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS); |
| 51 | cblue = Cbbtab[cb]; |
| 52 | /* Fetch 2 Y values and emit 2 pixels */ |
| 53 | y = GETJSAMPLE(*inptr0++); |
| 54 | outptr[RGB_RED] = range_limit[y + cred]; |
| 55 | outptr[RGB_GREEN] = range_limit[y + cgreen]; |
| 56 | outptr[RGB_BLUE] = range_limit[y + cblue]; |
| 57 | outptr += RGB_PIXELSIZE; |
| 58 | y = GETJSAMPLE(*inptr0++); |
| 59 | outptr[RGB_RED] = range_limit[y + cred]; |
| 60 | outptr[RGB_GREEN] = range_limit[y + cgreen]; |
| 61 | outptr[RGB_BLUE] = range_limit[y + cblue]; |
| 62 | outptr += RGB_PIXELSIZE; |
| 63 | } |
| 64 | /* If image width is odd, do the last output column separately */ |
| 65 | if (cinfo->output_width & 1) { |
| 66 | cb = GETJSAMPLE(*inptr1); |
| 67 | cr = GETJSAMPLE(*inptr2); |
| 68 | cred = Crrtab[cr]; |
| 69 | cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS); |
| 70 | cblue = Cbbtab[cb]; |
| 71 | y = GETJSAMPLE(*inptr0); |
| 72 | outptr[RGB_RED] = range_limit[y + cred]; |
| 73 | outptr[RGB_GREEN] = range_limit[y + cgreen]; |
| 74 | outptr[RGB_BLUE] = range_limit[y + cblue]; |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | |
| 79 | /* |
| 80 | * Upsample and color convert for the case of 2:1 horizontal and 2:1 vertical. |
| 81 | */ |
| 82 | |
| 83 | INLINE |
| 84 | LOCAL(void) |
| 85 | h2v2_merged_upsample_internal (j_decompress_ptr cinfo, |
| 86 | JSAMPIMAGE input_buf, |
| 87 | JDIMENSION in_row_group_ctr, |
| 88 | JSAMPARRAY output_buf) |
| 89 | { |
| 90 | my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample; |
| 91 | register int y, cred, cgreen, cblue; |
| 92 | int cb, cr; |
| 93 | register JSAMPROW outptr0, outptr1; |
| 94 | JSAMPROW inptr00, inptr01, inptr1, inptr2; |
| 95 | JDIMENSION col; |
| 96 | /* copy these pointers into registers if possible */ |
| 97 | register JSAMPLE * range_limit = cinfo->sample_range_limit; |
| 98 | int * Crrtab = upsample->Cr_r_tab; |
| 99 | int * Cbbtab = upsample->Cb_b_tab; |
| 100 | INT32 * Crgtab = upsample->Cr_g_tab; |
| 101 | INT32 * Cbgtab = upsample->Cb_g_tab; |
| 102 | SHIFT_TEMPS |
| 103 | |
| 104 | inptr00 = input_buf[0][in_row_group_ctr*2]; |
| 105 | inptr01 = input_buf[0][in_row_group_ctr*2 + 1]; |
| 106 | inptr1 = input_buf[1][in_row_group_ctr]; |
| 107 | inptr2 = input_buf[2][in_row_group_ctr]; |
| 108 | outptr0 = output_buf[0]; |
| 109 | outptr1 = output_buf[1]; |
| 110 | /* Loop for each group of output pixels */ |
| 111 | for (col = cinfo->output_width >> 1; col > 0; col--) { |
| 112 | /* Do the chroma part of the calculation */ |
| 113 | cb = GETJSAMPLE(*inptr1++); |
| 114 | cr = GETJSAMPLE(*inptr2++); |
| 115 | cred = Crrtab[cr]; |
| 116 | cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS); |
| 117 | cblue = Cbbtab[cb]; |
| 118 | /* Fetch 4 Y values and emit 4 pixels */ |
| 119 | y = GETJSAMPLE(*inptr00++); |
| 120 | outptr0[RGB_RED] = range_limit[y + cred]; |
| 121 | outptr0[RGB_GREEN] = range_limit[y + cgreen]; |
| 122 | outptr0[RGB_BLUE] = range_limit[y + cblue]; |
| 123 | outptr0 += RGB_PIXELSIZE; |
| 124 | y = GETJSAMPLE(*inptr00++); |
| 125 | outptr0[RGB_RED] = range_limit[y + cred]; |
| 126 | outptr0[RGB_GREEN] = range_limit[y + cgreen]; |
| 127 | outptr0[RGB_BLUE] = range_limit[y + cblue]; |
| 128 | outptr0 += RGB_PIXELSIZE; |
| 129 | y = GETJSAMPLE(*inptr01++); |
| 130 | outptr1[RGB_RED] = range_limit[y + cred]; |
| 131 | outptr1[RGB_GREEN] = range_limit[y + cgreen]; |
| 132 | outptr1[RGB_BLUE] = range_limit[y + cblue]; |
| 133 | outptr1 += RGB_PIXELSIZE; |
| 134 | y = GETJSAMPLE(*inptr01++); |
| 135 | outptr1[RGB_RED] = range_limit[y + cred]; |
| 136 | outptr1[RGB_GREEN] = range_limit[y + cgreen]; |
| 137 | outptr1[RGB_BLUE] = range_limit[y + cblue]; |
| 138 | outptr1 += RGB_PIXELSIZE; |
| 139 | } |
| 140 | /* If image width is odd, do the last output column separately */ |
| 141 | if (cinfo->output_width & 1) { |
| 142 | cb = GETJSAMPLE(*inptr1); |
| 143 | cr = GETJSAMPLE(*inptr2); |
| 144 | cred = Crrtab[cr]; |
| 145 | cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS); |
| 146 | cblue = Cbbtab[cb]; |
| 147 | y = GETJSAMPLE(*inptr00); |
| 148 | outptr0[RGB_RED] = range_limit[y + cred]; |
| 149 | outptr0[RGB_GREEN] = range_limit[y + cgreen]; |
| 150 | outptr0[RGB_BLUE] = range_limit[y + cblue]; |
| 151 | y = GETJSAMPLE(*inptr01); |
| 152 | outptr1[RGB_RED] = range_limit[y + cred]; |
| 153 | outptr1[RGB_GREEN] = range_limit[y + cgreen]; |
| 154 | outptr1[RGB_BLUE] = range_limit[y + cblue]; |
| 155 | } |
| 156 | } |