Aaron Gable | feec46f | 2015-08-06 09:54:48 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * jdmrg565.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) 2013, Linaro Limited. |
| 8 | * Copyright (C) 2014, D. R. Commander. |
| 9 | * For conditions of distribution and use, see the accompanying README file. |
| 10 | * |
| 11 | * This file contains code for merged upsampling/color conversion. |
| 12 | */ |
| 13 | |
| 14 | |
| 15 | INLINE |
| 16 | LOCAL(void) |
| 17 | h2v1_merged_upsample_565_internal (j_decompress_ptr cinfo, |
| 18 | JSAMPIMAGE input_buf, |
| 19 | JDIMENSION in_row_group_ctr, |
| 20 | JSAMPARRAY output_buf) |
| 21 | { |
| 22 | my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample; |
| 23 | register int y, cred, cgreen, cblue; |
| 24 | int cb, cr; |
| 25 | register JSAMPROW outptr; |
| 26 | JSAMPROW inptr0, inptr1, inptr2; |
| 27 | JDIMENSION col; |
| 28 | /* copy these pointers into registers if possible */ |
| 29 | register JSAMPLE * range_limit = cinfo->sample_range_limit; |
| 30 | int * Crrtab = upsample->Cr_r_tab; |
| 31 | int * Cbbtab = upsample->Cb_b_tab; |
| 32 | INT32 * Crgtab = upsample->Cr_g_tab; |
| 33 | INT32 * Cbgtab = upsample->Cb_g_tab; |
| 34 | unsigned int r, g, b; |
| 35 | INT32 rgb; |
| 36 | SHIFT_TEMPS |
| 37 | |
| 38 | inptr0 = input_buf[0][in_row_group_ctr]; |
| 39 | inptr1 = input_buf[1][in_row_group_ctr]; |
| 40 | inptr2 = input_buf[2][in_row_group_ctr]; |
| 41 | outptr = output_buf[0]; |
| 42 | |
| 43 | /* Loop for each pair of output pixels */ |
| 44 | for (col = cinfo->output_width >> 1; col > 0; col--) { |
| 45 | /* Do the chroma part of the calculation */ |
| 46 | cb = GETJSAMPLE(*inptr1++); |
| 47 | cr = GETJSAMPLE(*inptr2++); |
| 48 | cred = Crrtab[cr]; |
| 49 | cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS); |
| 50 | cblue = Cbbtab[cb]; |
| 51 | |
| 52 | /* Fetch 2 Y values and emit 2 pixels */ |
| 53 | y = GETJSAMPLE(*inptr0++); |
| 54 | r = range_limit[y + cred]; |
| 55 | g = range_limit[y + cgreen]; |
| 56 | b = range_limit[y + cblue]; |
| 57 | rgb = PACK_SHORT_565(r, g, b); |
| 58 | |
| 59 | y = GETJSAMPLE(*inptr0++); |
| 60 | r = range_limit[y + cred]; |
| 61 | g = range_limit[y + cgreen]; |
| 62 | b = range_limit[y + cblue]; |
| 63 | rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(r, g, b)); |
| 64 | |
| 65 | WRITE_TWO_PIXELS(outptr, rgb); |
| 66 | outptr += 4; |
| 67 | } |
| 68 | |
| 69 | /* If image width is odd, do the last output column separately */ |
| 70 | if (cinfo->output_width & 1) { |
| 71 | cb = GETJSAMPLE(*inptr1); |
| 72 | cr = GETJSAMPLE(*inptr2); |
| 73 | cred = Crrtab[cr]; |
| 74 | cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS); |
| 75 | cblue = Cbbtab[cb]; |
| 76 | y = GETJSAMPLE(*inptr0); |
| 77 | r = range_limit[y + cred]; |
| 78 | g = range_limit[y + cgreen]; |
| 79 | b = range_limit[y + cblue]; |
| 80 | rgb = PACK_SHORT_565(r, g, b); |
| 81 | *(INT16*)outptr = rgb; |
| 82 | } |
| 83 | } |
| 84 | |
| 85 | |
| 86 | INLINE |
| 87 | LOCAL(void) |
| 88 | h2v1_merged_upsample_565D_internal (j_decompress_ptr cinfo, |
| 89 | JSAMPIMAGE input_buf, |
| 90 | JDIMENSION in_row_group_ctr, |
| 91 | JSAMPARRAY output_buf) |
| 92 | { |
| 93 | my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample; |
| 94 | register int y, cred, cgreen, cblue; |
| 95 | int cb, cr; |
| 96 | register JSAMPROW outptr; |
| 97 | JSAMPROW inptr0, inptr1, inptr2; |
| 98 | JDIMENSION col; |
| 99 | /* copy these pointers into registers if possible */ |
| 100 | register JSAMPLE * range_limit = cinfo->sample_range_limit; |
| 101 | int * Crrtab = upsample->Cr_r_tab; |
| 102 | int * Cbbtab = upsample->Cb_b_tab; |
| 103 | INT32 * Crgtab = upsample->Cr_g_tab; |
| 104 | INT32 * Cbgtab = upsample->Cb_g_tab; |
| 105 | INT32 d0 = dither_matrix[cinfo->output_scanline & DITHER_MASK]; |
| 106 | unsigned int r, g, b; |
| 107 | INT32 rgb; |
| 108 | SHIFT_TEMPS |
| 109 | |
| 110 | inptr0 = input_buf[0][in_row_group_ctr]; |
| 111 | inptr1 = input_buf[1][in_row_group_ctr]; |
| 112 | inptr2 = input_buf[2][in_row_group_ctr]; |
| 113 | outptr = output_buf[0]; |
| 114 | |
| 115 | /* Loop for each pair of output pixels */ |
| 116 | for (col = cinfo->output_width >> 1; col > 0; col--) { |
| 117 | /* Do the chroma part of the calculation */ |
| 118 | cb = GETJSAMPLE(*inptr1++); |
| 119 | cr = GETJSAMPLE(*inptr2++); |
| 120 | cred = Crrtab[cr]; |
| 121 | cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS); |
| 122 | cblue = Cbbtab[cb]; |
| 123 | |
| 124 | /* Fetch 2 Y values and emit 2 pixels */ |
| 125 | y = GETJSAMPLE(*inptr0++); |
| 126 | r = range_limit[DITHER_565_R(y + cred, d0)]; |
| 127 | g = range_limit[DITHER_565_G(y + cgreen, d0)]; |
| 128 | b = range_limit[DITHER_565_B(y + cblue, d0)]; |
| 129 | d0 = DITHER_ROTATE(d0); |
| 130 | rgb = PACK_SHORT_565(r, g, b); |
| 131 | |
| 132 | y = GETJSAMPLE(*inptr0++); |
| 133 | r = range_limit[DITHER_565_R(y + cred, d0)]; |
| 134 | g = range_limit[DITHER_565_G(y + cgreen, d0)]; |
| 135 | b = range_limit[DITHER_565_B(y + cblue, d0)]; |
| 136 | d0 = DITHER_ROTATE(d0); |
| 137 | rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(r, g, b)); |
| 138 | |
| 139 | WRITE_TWO_PIXELS(outptr, rgb); |
| 140 | outptr += 4; |
| 141 | } |
| 142 | |
| 143 | /* If image width is odd, do the last output column separately */ |
| 144 | if (cinfo->output_width & 1) { |
| 145 | cb = GETJSAMPLE(*inptr1); |
| 146 | cr = GETJSAMPLE(*inptr2); |
| 147 | cred = Crrtab[cr]; |
| 148 | cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS); |
| 149 | cblue = Cbbtab[cb]; |
| 150 | y = GETJSAMPLE(*inptr0); |
| 151 | r = range_limit[DITHER_565_R(y + cred, d0)]; |
| 152 | g = range_limit[DITHER_565_G(y + cgreen, d0)]; |
| 153 | b = range_limit[DITHER_565_B(y + cblue, d0)]; |
| 154 | rgb = PACK_SHORT_565(r, g, b); |
| 155 | *(INT16*)outptr = rgb; |
| 156 | } |
| 157 | } |
| 158 | |
| 159 | |
| 160 | INLINE |
| 161 | LOCAL(void) |
| 162 | h2v2_merged_upsample_565_internal (j_decompress_ptr cinfo, |
| 163 | JSAMPIMAGE input_buf, |
| 164 | JDIMENSION in_row_group_ctr, |
| 165 | JSAMPARRAY output_buf) |
| 166 | { |
| 167 | my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample; |
| 168 | register int y, cred, cgreen, cblue; |
| 169 | int cb, cr; |
| 170 | register JSAMPROW outptr0, outptr1; |
| 171 | JSAMPROW inptr00, inptr01, inptr1, inptr2; |
| 172 | JDIMENSION col; |
| 173 | /* copy these pointers into registers if possible */ |
| 174 | register JSAMPLE * range_limit = cinfo->sample_range_limit; |
| 175 | int * Crrtab = upsample->Cr_r_tab; |
| 176 | int * Cbbtab = upsample->Cb_b_tab; |
| 177 | INT32 * Crgtab = upsample->Cr_g_tab; |
| 178 | INT32 * Cbgtab = upsample->Cb_g_tab; |
| 179 | unsigned int r, g, b; |
| 180 | INT32 rgb; |
| 181 | SHIFT_TEMPS |
| 182 | |
| 183 | inptr00 = input_buf[0][in_row_group_ctr * 2]; |
| 184 | inptr01 = input_buf[0][in_row_group_ctr * 2 + 1]; |
| 185 | inptr1 = input_buf[1][in_row_group_ctr]; |
| 186 | inptr2 = input_buf[2][in_row_group_ctr]; |
| 187 | outptr0 = output_buf[0]; |
| 188 | outptr1 = output_buf[1]; |
| 189 | |
| 190 | /* Loop for each group of output pixels */ |
| 191 | for (col = cinfo->output_width >> 1; col > 0; col--) { |
| 192 | /* Do the chroma part of the calculation */ |
| 193 | cb = GETJSAMPLE(*inptr1++); |
| 194 | cr = GETJSAMPLE(*inptr2++); |
| 195 | cred = Crrtab[cr]; |
| 196 | cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS); |
| 197 | cblue = Cbbtab[cb]; |
| 198 | |
| 199 | /* Fetch 4 Y values and emit 4 pixels */ |
| 200 | y = GETJSAMPLE(*inptr00++); |
| 201 | r = range_limit[y + cred]; |
| 202 | g = range_limit[y + cgreen]; |
| 203 | b = range_limit[y + cblue]; |
| 204 | rgb = PACK_SHORT_565(r, g, b); |
| 205 | |
| 206 | y = GETJSAMPLE(*inptr00++); |
| 207 | r = range_limit[y + cred]; |
| 208 | g = range_limit[y + cgreen]; |
| 209 | b = range_limit[y + cblue]; |
| 210 | rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(r, g, b)); |
| 211 | |
| 212 | WRITE_TWO_PIXELS(outptr0, rgb); |
| 213 | outptr0 += 4; |
| 214 | |
| 215 | y = GETJSAMPLE(*inptr01++); |
| 216 | r = range_limit[y + cred]; |
| 217 | g = range_limit[y + cgreen]; |
| 218 | b = range_limit[y + cblue]; |
| 219 | rgb = PACK_SHORT_565(r, g, b); |
| 220 | |
| 221 | y = GETJSAMPLE(*inptr01++); |
| 222 | r = range_limit[y + cred]; |
| 223 | g = range_limit[y + cgreen]; |
| 224 | b = range_limit[y + cblue]; |
| 225 | rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(r, g, b)); |
| 226 | |
| 227 | WRITE_TWO_PIXELS(outptr1, rgb); |
| 228 | outptr1 += 4; |
| 229 | } |
| 230 | |
| 231 | /* If image width is odd, do the last output column separately */ |
| 232 | if (cinfo->output_width & 1) { |
| 233 | cb = GETJSAMPLE(*inptr1); |
| 234 | cr = GETJSAMPLE(*inptr2); |
| 235 | cred = Crrtab[cr]; |
| 236 | cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS); |
| 237 | cblue = Cbbtab[cb]; |
| 238 | |
| 239 | y = GETJSAMPLE(*inptr00); |
| 240 | r = range_limit[y + cred]; |
| 241 | g = range_limit[y + cgreen]; |
| 242 | b = range_limit[y + cblue]; |
| 243 | rgb = PACK_SHORT_565(r, g, b); |
| 244 | *(INT16*)outptr0 = rgb; |
| 245 | |
| 246 | y = GETJSAMPLE(*inptr01); |
| 247 | r = range_limit[y + cred]; |
| 248 | g = range_limit[y + cgreen]; |
| 249 | b = range_limit[y + cblue]; |
| 250 | rgb = PACK_SHORT_565(r, g, b); |
| 251 | *(INT16*)outptr1 = rgb; |
| 252 | } |
| 253 | } |
| 254 | |
| 255 | |
| 256 | INLINE |
| 257 | LOCAL(void) |
| 258 | h2v2_merged_upsample_565D_internal (j_decompress_ptr cinfo, |
| 259 | JSAMPIMAGE input_buf, |
| 260 | JDIMENSION in_row_group_ctr, |
| 261 | JSAMPARRAY output_buf) |
| 262 | { |
| 263 | my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample; |
| 264 | register int y, cred, cgreen, cblue; |
| 265 | int cb, cr; |
| 266 | register JSAMPROW outptr0, outptr1; |
| 267 | JSAMPROW inptr00, inptr01, inptr1, inptr2; |
| 268 | JDIMENSION col; |
| 269 | /* copy these pointers into registers if possible */ |
| 270 | register JSAMPLE * range_limit = cinfo->sample_range_limit; |
| 271 | int * Crrtab = upsample->Cr_r_tab; |
| 272 | int * Cbbtab = upsample->Cb_b_tab; |
| 273 | INT32 * Crgtab = upsample->Cr_g_tab; |
| 274 | INT32 * Cbgtab = upsample->Cb_g_tab; |
| 275 | INT32 d0 = dither_matrix[cinfo->output_scanline & DITHER_MASK]; |
| 276 | INT32 d1 = dither_matrix[(cinfo->output_scanline+1) & DITHER_MASK]; |
| 277 | unsigned int r, g, b; |
| 278 | INT32 rgb; |
| 279 | SHIFT_TEMPS |
| 280 | |
| 281 | inptr00 = input_buf[0][in_row_group_ctr*2]; |
| 282 | inptr01 = input_buf[0][in_row_group_ctr*2 + 1]; |
| 283 | inptr1 = input_buf[1][in_row_group_ctr]; |
| 284 | inptr2 = input_buf[2][in_row_group_ctr]; |
| 285 | outptr0 = output_buf[0]; |
| 286 | outptr1 = output_buf[1]; |
| 287 | |
| 288 | /* Loop for each group of output pixels */ |
| 289 | for (col = cinfo->output_width >> 1; col > 0; col--) { |
| 290 | /* Do the chroma part of the calculation */ |
| 291 | cb = GETJSAMPLE(*inptr1++); |
| 292 | cr = GETJSAMPLE(*inptr2++); |
| 293 | cred = Crrtab[cr]; |
| 294 | cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS); |
| 295 | cblue = Cbbtab[cb]; |
| 296 | |
| 297 | /* Fetch 4 Y values and emit 4 pixels */ |
| 298 | y = GETJSAMPLE(*inptr00++); |
| 299 | r = range_limit[DITHER_565_R(y + cred, d0)]; |
| 300 | g = range_limit[DITHER_565_G(y + cgreen, d0)]; |
| 301 | b = range_limit[DITHER_565_B(y + cblue, d0)]; |
| 302 | d0 = DITHER_ROTATE(d0); |
| 303 | rgb = PACK_SHORT_565(r, g, b); |
| 304 | |
| 305 | y = GETJSAMPLE(*inptr00++); |
| 306 | r = range_limit[DITHER_565_R(y + cred, d1)]; |
| 307 | g = range_limit[DITHER_565_G(y + cgreen, d1)]; |
| 308 | b = range_limit[DITHER_565_B(y + cblue, d1)]; |
| 309 | d1 = DITHER_ROTATE(d1); |
| 310 | rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(r, g, b)); |
| 311 | |
| 312 | WRITE_TWO_PIXELS(outptr0, rgb); |
| 313 | outptr0 += 4; |
| 314 | |
| 315 | y = GETJSAMPLE(*inptr01++); |
| 316 | r = range_limit[DITHER_565_R(y + cred, d0)]; |
| 317 | g = range_limit[DITHER_565_G(y + cgreen, d0)]; |
| 318 | b = range_limit[DITHER_565_B(y + cblue, d0)]; |
| 319 | d0 = DITHER_ROTATE(d0); |
| 320 | rgb = PACK_SHORT_565(r, g, b); |
| 321 | |
| 322 | y = GETJSAMPLE(*inptr01++); |
| 323 | r = range_limit[DITHER_565_R(y + cred, d1)]; |
| 324 | g = range_limit[DITHER_565_G(y + cgreen, d1)]; |
| 325 | b = range_limit[DITHER_565_B(y + cblue, d1)]; |
| 326 | d1 = DITHER_ROTATE(d1); |
| 327 | rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(r, g, b)); |
| 328 | |
| 329 | WRITE_TWO_PIXELS(outptr1, rgb); |
| 330 | outptr1 += 4; |
| 331 | } |
| 332 | |
| 333 | /* If image width is odd, do the last output column separately */ |
| 334 | if (cinfo->output_width & 1) { |
| 335 | cb = GETJSAMPLE(*inptr1); |
| 336 | cr = GETJSAMPLE(*inptr2); |
| 337 | cred = Crrtab[cr]; |
| 338 | cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS); |
| 339 | cblue = Cbbtab[cb]; |
| 340 | |
| 341 | y = GETJSAMPLE(*inptr00); |
| 342 | r = range_limit[DITHER_565_R(y + cred, d0)]; |
| 343 | g = range_limit[DITHER_565_G(y + cgreen, d0)]; |
| 344 | b = range_limit[DITHER_565_B(y + cblue, d0)]; |
| 345 | rgb = PACK_SHORT_565(r, g, b); |
| 346 | *(INT16*)outptr0 = rgb; |
| 347 | |
| 348 | y = GETJSAMPLE(*inptr01); |
| 349 | r = range_limit[DITHER_565_R(y + cred, d1)]; |
| 350 | g = range_limit[DITHER_565_G(y + cgreen, d1)]; |
| 351 | b = range_limit[DITHER_565_B(y + cblue, d1)]; |
| 352 | rgb = PACK_SHORT_565(r, g, b); |
| 353 | *(INT16*)outptr1 = rgb; |
| 354 | } |
| 355 | } |