1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/libjpeg/jdcolor.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,677 @@
1.4 +/*
1.5 + * jdcolor.c
1.6 + *
1.7 + * This file was part of the Independent JPEG Group's software:
1.8 + * Copyright (C) 1991-1997, Thomas G. Lane.
1.9 + * Modified 2011 by Guido Vollbeding.
1.10 + * libjpeg-turbo Modifications:
1.11 + * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
1.12 + * Copyright (C) 2009, 2011-2012, D. R. Commander.
1.13 + * For conditions of distribution and use, see the accompanying README file.
1.14 + *
1.15 + * This file contains output colorspace conversion routines.
1.16 + */
1.17 +
1.18 +#define JPEG_INTERNALS
1.19 +#include "jinclude.h"
1.20 +#include "jpeglib.h"
1.21 +#include "jsimd.h"
1.22 +#include "config.h"
1.23 +
1.24 +
1.25 +/* Private subobject */
1.26 +
1.27 +typedef struct {
1.28 + struct jpeg_color_deconverter pub; /* public fields */
1.29 +
1.30 + /* Private state for YCC->RGB conversion */
1.31 + int * Cr_r_tab; /* => table for Cr to R conversion */
1.32 + int * Cb_b_tab; /* => table for Cb to B conversion */
1.33 + INT32 * Cr_g_tab; /* => table for Cr to G conversion */
1.34 + INT32 * Cb_g_tab; /* => table for Cb to G conversion */
1.35 +
1.36 + /* Private state for RGB->Y conversion */
1.37 + INT32 * rgb_y_tab; /* => table for RGB to Y conversion */
1.38 +} my_color_deconverter;
1.39 +
1.40 +typedef my_color_deconverter * my_cconvert_ptr;
1.41 +
1.42 +
1.43 +/**************** YCbCr -> RGB conversion: most common case **************/
1.44 +/**************** RGB -> Y conversion: less common case **************/
1.45 +
1.46 +/*
1.47 + * YCbCr is defined per CCIR 601-1, except that Cb and Cr are
1.48 + * normalized to the range 0..MAXJSAMPLE rather than -0.5 .. 0.5.
1.49 + * The conversion equations to be implemented are therefore
1.50 + *
1.51 + * R = Y + 1.40200 * Cr
1.52 + * G = Y - 0.34414 * Cb - 0.71414 * Cr
1.53 + * B = Y + 1.77200 * Cb
1.54 + *
1.55 + * Y = 0.29900 * R + 0.58700 * G + 0.11400 * B
1.56 + *
1.57 + * where Cb and Cr represent the incoming values less CENTERJSAMPLE.
1.58 + * (These numbers are derived from TIFF 6.0 section 21, dated 3-June-92.)
1.59 + *
1.60 + * To avoid floating-point arithmetic, we represent the fractional constants
1.61 + * as integers scaled up by 2^16 (about 4 digits precision); we have to divide
1.62 + * the products by 2^16, with appropriate rounding, to get the correct answer.
1.63 + * Notice that Y, being an integral input, does not contribute any fraction
1.64 + * so it need not participate in the rounding.
1.65 + *
1.66 + * For even more speed, we avoid doing any multiplications in the inner loop
1.67 + * by precalculating the constants times Cb and Cr for all possible values.
1.68 + * For 8-bit JSAMPLEs this is very reasonable (only 256 entries per table);
1.69 + * for 12-bit samples it is still acceptable. It's not very reasonable for
1.70 + * 16-bit samples, but if you want lossless storage you shouldn't be changing
1.71 + * colorspace anyway.
1.72 + * The Cr=>R and Cb=>B values can be rounded to integers in advance; the
1.73 + * values for the G calculation are left scaled up, since we must add them
1.74 + * together before rounding.
1.75 + */
1.76 +
1.77 +#define SCALEBITS 16 /* speediest right-shift on some machines */
1.78 +#define ONE_HALF ((INT32) 1 << (SCALEBITS-1))
1.79 +#define FIX(x) ((INT32) ((x) * (1L<<SCALEBITS) + 0.5))
1.80 +
1.81 +/* We allocate one big table for RGB->Y conversion and divide it up into
1.82 + * three parts, instead of doing three alloc_small requests. This lets us
1.83 + * use a single table base address, which can be held in a register in the
1.84 + * inner loops on many machines (more than can hold all three addresses,
1.85 + * anyway).
1.86 + */
1.87 +
1.88 +#define R_Y_OFF 0 /* offset to R => Y section */
1.89 +#define G_Y_OFF (1*(MAXJSAMPLE+1)) /* offset to G => Y section */
1.90 +#define B_Y_OFF (2*(MAXJSAMPLE+1)) /* etc. */
1.91 +#define TABLE_SIZE (3*(MAXJSAMPLE+1))
1.92 +
1.93 +
1.94 +/* Include inline routines for colorspace extensions */
1.95 +
1.96 +#include "jdcolext.c"
1.97 +#undef RGB_RED
1.98 +#undef RGB_GREEN
1.99 +#undef RGB_BLUE
1.100 +#undef RGB_PIXELSIZE
1.101 +
1.102 +#define RGB_RED EXT_RGB_RED
1.103 +#define RGB_GREEN EXT_RGB_GREEN
1.104 +#define RGB_BLUE EXT_RGB_BLUE
1.105 +#define RGB_PIXELSIZE EXT_RGB_PIXELSIZE
1.106 +#define ycc_rgb_convert_internal ycc_extrgb_convert_internal
1.107 +#define gray_rgb_convert_internal gray_extrgb_convert_internal
1.108 +#define rgb_rgb_convert_internal rgb_extrgb_convert_internal
1.109 +#include "jdcolext.c"
1.110 +#undef RGB_RED
1.111 +#undef RGB_GREEN
1.112 +#undef RGB_BLUE
1.113 +#undef RGB_PIXELSIZE
1.114 +#undef ycc_rgb_convert_internal
1.115 +#undef gray_rgb_convert_internal
1.116 +#undef rgb_rgb_convert_internal
1.117 +
1.118 +#define RGB_RED EXT_RGBX_RED
1.119 +#define RGB_GREEN EXT_RGBX_GREEN
1.120 +#define RGB_BLUE EXT_RGBX_BLUE
1.121 +#define RGB_ALPHA 3
1.122 +#define RGB_PIXELSIZE EXT_RGBX_PIXELSIZE
1.123 +#define ycc_rgb_convert_internal ycc_extrgbx_convert_internal
1.124 +#define gray_rgb_convert_internal gray_extrgbx_convert_internal
1.125 +#define rgb_rgb_convert_internal rgb_extrgbx_convert_internal
1.126 +#include "jdcolext.c"
1.127 +#undef RGB_RED
1.128 +#undef RGB_GREEN
1.129 +#undef RGB_BLUE
1.130 +#undef RGB_ALPHA
1.131 +#undef RGB_PIXELSIZE
1.132 +#undef ycc_rgb_convert_internal
1.133 +#undef gray_rgb_convert_internal
1.134 +#undef rgb_rgb_convert_internal
1.135 +
1.136 +#define RGB_RED EXT_BGR_RED
1.137 +#define RGB_GREEN EXT_BGR_GREEN
1.138 +#define RGB_BLUE EXT_BGR_BLUE
1.139 +#define RGB_PIXELSIZE EXT_BGR_PIXELSIZE
1.140 +#define ycc_rgb_convert_internal ycc_extbgr_convert_internal
1.141 +#define gray_rgb_convert_internal gray_extbgr_convert_internal
1.142 +#define rgb_rgb_convert_internal rgb_extbgr_convert_internal
1.143 +#include "jdcolext.c"
1.144 +#undef RGB_RED
1.145 +#undef RGB_GREEN
1.146 +#undef RGB_BLUE
1.147 +#undef RGB_PIXELSIZE
1.148 +#undef ycc_rgb_convert_internal
1.149 +#undef gray_rgb_convert_internal
1.150 +#undef rgb_rgb_convert_internal
1.151 +
1.152 +#define RGB_RED EXT_BGRX_RED
1.153 +#define RGB_GREEN EXT_BGRX_GREEN
1.154 +#define RGB_BLUE EXT_BGRX_BLUE
1.155 +#define RGB_ALPHA 3
1.156 +#define RGB_PIXELSIZE EXT_BGRX_PIXELSIZE
1.157 +#define ycc_rgb_convert_internal ycc_extbgrx_convert_internal
1.158 +#define gray_rgb_convert_internal gray_extbgrx_convert_internal
1.159 +#define rgb_rgb_convert_internal rgb_extbgrx_convert_internal
1.160 +#include "jdcolext.c"
1.161 +#undef RGB_RED
1.162 +#undef RGB_GREEN
1.163 +#undef RGB_BLUE
1.164 +#undef RGB_ALPHA
1.165 +#undef RGB_PIXELSIZE
1.166 +#undef ycc_rgb_convert_internal
1.167 +#undef gray_rgb_convert_internal
1.168 +#undef rgb_rgb_convert_internal
1.169 +
1.170 +#define RGB_RED EXT_XBGR_RED
1.171 +#define RGB_GREEN EXT_XBGR_GREEN
1.172 +#define RGB_BLUE EXT_XBGR_BLUE
1.173 +#define RGB_ALPHA 0
1.174 +#define RGB_PIXELSIZE EXT_XBGR_PIXELSIZE
1.175 +#define ycc_rgb_convert_internal ycc_extxbgr_convert_internal
1.176 +#define gray_rgb_convert_internal gray_extxbgr_convert_internal
1.177 +#define rgb_rgb_convert_internal rgb_extxbgr_convert_internal
1.178 +#include "jdcolext.c"
1.179 +#undef RGB_RED
1.180 +#undef RGB_GREEN
1.181 +#undef RGB_BLUE
1.182 +#undef RGB_ALPHA
1.183 +#undef RGB_PIXELSIZE
1.184 +#undef ycc_rgb_convert_internal
1.185 +#undef gray_rgb_convert_internal
1.186 +#undef rgb_rgb_convert_internal
1.187 +
1.188 +#define RGB_RED EXT_XRGB_RED
1.189 +#define RGB_GREEN EXT_XRGB_GREEN
1.190 +#define RGB_BLUE EXT_XRGB_BLUE
1.191 +#define RGB_ALPHA 0
1.192 +#define RGB_PIXELSIZE EXT_XRGB_PIXELSIZE
1.193 +#define ycc_rgb_convert_internal ycc_extxrgb_convert_internal
1.194 +#define gray_rgb_convert_internal gray_extxrgb_convert_internal
1.195 +#define rgb_rgb_convert_internal rgb_extxrgb_convert_internal
1.196 +#include "jdcolext.c"
1.197 +#undef RGB_RED
1.198 +#undef RGB_GREEN
1.199 +#undef RGB_BLUE
1.200 +#undef RGB_ALPHA
1.201 +#undef RGB_PIXELSIZE
1.202 +#undef ycc_rgb_convert_internal
1.203 +#undef gray_rgb_convert_internal
1.204 +#undef rgb_rgb_convert_internal
1.205 +
1.206 +
1.207 +/*
1.208 + * Initialize tables for YCC->RGB colorspace conversion.
1.209 + */
1.210 +
1.211 +LOCAL(void)
1.212 +build_ycc_rgb_table (j_decompress_ptr cinfo)
1.213 +{
1.214 + my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
1.215 + int i;
1.216 + INT32 x;
1.217 + SHIFT_TEMPS
1.218 +
1.219 + cconvert->Cr_r_tab = (int *)
1.220 + (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
1.221 + (MAXJSAMPLE+1) * SIZEOF(int));
1.222 + cconvert->Cb_b_tab = (int *)
1.223 + (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
1.224 + (MAXJSAMPLE+1) * SIZEOF(int));
1.225 + cconvert->Cr_g_tab = (INT32 *)
1.226 + (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
1.227 + (MAXJSAMPLE+1) * SIZEOF(INT32));
1.228 + cconvert->Cb_g_tab = (INT32 *)
1.229 + (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
1.230 + (MAXJSAMPLE+1) * SIZEOF(INT32));
1.231 +
1.232 + for (i = 0, x = -CENTERJSAMPLE; i <= MAXJSAMPLE; i++, x++) {
1.233 + /* i is the actual input pixel value, in the range 0..MAXJSAMPLE */
1.234 + /* The Cb or Cr value we are thinking of is x = i - CENTERJSAMPLE */
1.235 + /* Cr=>R value is nearest int to 1.40200 * x */
1.236 + cconvert->Cr_r_tab[i] = (int)
1.237 + RIGHT_SHIFT(FIX(1.40200) * x + ONE_HALF, SCALEBITS);
1.238 + /* Cb=>B value is nearest int to 1.77200 * x */
1.239 + cconvert->Cb_b_tab[i] = (int)
1.240 + RIGHT_SHIFT(FIX(1.77200) * x + ONE_HALF, SCALEBITS);
1.241 + /* Cr=>G value is scaled-up -0.71414 * x */
1.242 + cconvert->Cr_g_tab[i] = (- FIX(0.71414)) * x;
1.243 + /* Cb=>G value is scaled-up -0.34414 * x */
1.244 + /* We also add in ONE_HALF so that need not do it in inner loop */
1.245 + cconvert->Cb_g_tab[i] = (- FIX(0.34414)) * x + ONE_HALF;
1.246 + }
1.247 +}
1.248 +
1.249 +
1.250 +/*
1.251 + * Convert some rows of samples to the output colorspace.
1.252 + */
1.253 +
1.254 +METHODDEF(void)
1.255 +ycc_rgb_convert (j_decompress_ptr cinfo,
1.256 + JSAMPIMAGE input_buf, JDIMENSION input_row,
1.257 + JSAMPARRAY output_buf, int num_rows)
1.258 +{
1.259 + switch (cinfo->out_color_space) {
1.260 + case JCS_EXT_RGB:
1.261 + ycc_extrgb_convert_internal(cinfo, input_buf, input_row, output_buf,
1.262 + num_rows);
1.263 + break;
1.264 + case JCS_EXT_RGBX:
1.265 + case JCS_EXT_RGBA:
1.266 + ycc_extrgbx_convert_internal(cinfo, input_buf, input_row, output_buf,
1.267 + num_rows);
1.268 + break;
1.269 + case JCS_EXT_BGR:
1.270 + ycc_extbgr_convert_internal(cinfo, input_buf, input_row, output_buf,
1.271 + num_rows);
1.272 + break;
1.273 + case JCS_EXT_BGRX:
1.274 + case JCS_EXT_BGRA:
1.275 + ycc_extbgrx_convert_internal(cinfo, input_buf, input_row, output_buf,
1.276 + num_rows);
1.277 + break;
1.278 + case JCS_EXT_XBGR:
1.279 + case JCS_EXT_ABGR:
1.280 + ycc_extxbgr_convert_internal(cinfo, input_buf, input_row, output_buf,
1.281 + num_rows);
1.282 + break;
1.283 + case JCS_EXT_XRGB:
1.284 + case JCS_EXT_ARGB:
1.285 + ycc_extxrgb_convert_internal(cinfo, input_buf, input_row, output_buf,
1.286 + num_rows);
1.287 + break;
1.288 + default:
1.289 + ycc_rgb_convert_internal(cinfo, input_buf, input_row, output_buf,
1.290 + num_rows);
1.291 + break;
1.292 + }
1.293 +}
1.294 +
1.295 +
1.296 +/**************** Cases other than YCbCr -> RGB **************/
1.297 +
1.298 +
1.299 +/*
1.300 + * Initialize for RGB->grayscale colorspace conversion.
1.301 + */
1.302 +
1.303 +LOCAL(void)
1.304 +build_rgb_y_table (j_decompress_ptr cinfo)
1.305 +{
1.306 + my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
1.307 + INT32 * rgb_y_tab;
1.308 + INT32 i;
1.309 +
1.310 + /* Allocate and fill in the conversion tables. */
1.311 + cconvert->rgb_y_tab = rgb_y_tab = (INT32 *)
1.312 + (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
1.313 + (TABLE_SIZE * SIZEOF(INT32)));
1.314 +
1.315 + for (i = 0; i <= MAXJSAMPLE; i++) {
1.316 + rgb_y_tab[i+R_Y_OFF] = FIX(0.29900) * i;
1.317 + rgb_y_tab[i+G_Y_OFF] = FIX(0.58700) * i;
1.318 + rgb_y_tab[i+B_Y_OFF] = FIX(0.11400) * i + ONE_HALF;
1.319 + }
1.320 +}
1.321 +
1.322 +
1.323 +/*
1.324 + * Convert RGB to grayscale.
1.325 + */
1.326 +
1.327 +METHODDEF(void)
1.328 +rgb_gray_convert (j_decompress_ptr cinfo,
1.329 + JSAMPIMAGE input_buf, JDIMENSION input_row,
1.330 + JSAMPARRAY output_buf, int num_rows)
1.331 +{
1.332 + my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
1.333 + register int r, g, b;
1.334 + register INT32 * ctab = cconvert->rgb_y_tab;
1.335 + register JSAMPROW outptr;
1.336 + register JSAMPROW inptr0, inptr1, inptr2;
1.337 + register JDIMENSION col;
1.338 + JDIMENSION num_cols = cinfo->output_width;
1.339 +
1.340 + while (--num_rows >= 0) {
1.341 + inptr0 = input_buf[0][input_row];
1.342 + inptr1 = input_buf[1][input_row];
1.343 + inptr2 = input_buf[2][input_row];
1.344 + input_row++;
1.345 + outptr = *output_buf++;
1.346 + for (col = 0; col < num_cols; col++) {
1.347 + r = GETJSAMPLE(inptr0[col]);
1.348 + g = GETJSAMPLE(inptr1[col]);
1.349 + b = GETJSAMPLE(inptr2[col]);
1.350 + /* Y */
1.351 + outptr[col] = (JSAMPLE)
1.352 + ((ctab[r+R_Y_OFF] + ctab[g+G_Y_OFF] + ctab[b+B_Y_OFF])
1.353 + >> SCALEBITS);
1.354 + }
1.355 + }
1.356 +}
1.357 +
1.358 +
1.359 +/*
1.360 + * Color conversion for no colorspace change: just copy the data,
1.361 + * converting from separate-planes to interleaved representation.
1.362 + */
1.363 +
1.364 +METHODDEF(void)
1.365 +null_convert (j_decompress_ptr cinfo,
1.366 + JSAMPIMAGE input_buf, JDIMENSION input_row,
1.367 + JSAMPARRAY output_buf, int num_rows)
1.368 +{
1.369 + register JSAMPROW inptr, outptr;
1.370 + register JDIMENSION count;
1.371 + register int num_components = cinfo->num_components;
1.372 + JDIMENSION num_cols = cinfo->output_width;
1.373 + int ci;
1.374 +
1.375 + while (--num_rows >= 0) {
1.376 + for (ci = 0; ci < num_components; ci++) {
1.377 + inptr = input_buf[ci][input_row];
1.378 + outptr = output_buf[0] + ci;
1.379 + for (count = num_cols; count > 0; count--) {
1.380 + *outptr = *inptr++; /* needn't bother with GETJSAMPLE() here */
1.381 + outptr += num_components;
1.382 + }
1.383 + }
1.384 + input_row++;
1.385 + output_buf++;
1.386 + }
1.387 +}
1.388 +
1.389 +
1.390 +/*
1.391 + * Color conversion for grayscale: just copy the data.
1.392 + * This also works for YCbCr -> grayscale conversion, in which
1.393 + * we just copy the Y (luminance) component and ignore chrominance.
1.394 + */
1.395 +
1.396 +METHODDEF(void)
1.397 +grayscale_convert (j_decompress_ptr cinfo,
1.398 + JSAMPIMAGE input_buf, JDIMENSION input_row,
1.399 + JSAMPARRAY output_buf, int num_rows)
1.400 +{
1.401 + jcopy_sample_rows(input_buf[0], (int) input_row, output_buf, 0,
1.402 + num_rows, cinfo->output_width);
1.403 +}
1.404 +
1.405 +
1.406 +/*
1.407 + * Convert grayscale to RGB
1.408 + */
1.409 +
1.410 +METHODDEF(void)
1.411 +gray_rgb_convert (j_decompress_ptr cinfo,
1.412 + JSAMPIMAGE input_buf, JDIMENSION input_row,
1.413 + JSAMPARRAY output_buf, int num_rows)
1.414 +{
1.415 + switch (cinfo->out_color_space) {
1.416 + case JCS_EXT_RGB:
1.417 + gray_extrgb_convert_internal(cinfo, input_buf, input_row, output_buf,
1.418 + num_rows);
1.419 + break;
1.420 + case JCS_EXT_RGBX:
1.421 + case JCS_EXT_RGBA:
1.422 + gray_extrgbx_convert_internal(cinfo, input_buf, input_row, output_buf,
1.423 + num_rows);
1.424 + break;
1.425 + case JCS_EXT_BGR:
1.426 + gray_extbgr_convert_internal(cinfo, input_buf, input_row, output_buf,
1.427 + num_rows);
1.428 + break;
1.429 + case JCS_EXT_BGRX:
1.430 + case JCS_EXT_BGRA:
1.431 + gray_extbgrx_convert_internal(cinfo, input_buf, input_row, output_buf,
1.432 + num_rows);
1.433 + break;
1.434 + case JCS_EXT_XBGR:
1.435 + case JCS_EXT_ABGR:
1.436 + gray_extxbgr_convert_internal(cinfo, input_buf, input_row, output_buf,
1.437 + num_rows);
1.438 + break;
1.439 + case JCS_EXT_XRGB:
1.440 + case JCS_EXT_ARGB:
1.441 + gray_extxrgb_convert_internal(cinfo, input_buf, input_row, output_buf,
1.442 + num_rows);
1.443 + break;
1.444 + default:
1.445 + gray_rgb_convert_internal(cinfo, input_buf, input_row, output_buf,
1.446 + num_rows);
1.447 + break;
1.448 + }
1.449 +}
1.450 +
1.451 +
1.452 +/*
1.453 + * Convert plain RGB to extended RGB
1.454 + */
1.455 +
1.456 +METHODDEF(void)
1.457 +rgb_rgb_convert (j_decompress_ptr cinfo,
1.458 + JSAMPIMAGE input_buf, JDIMENSION input_row,
1.459 + JSAMPARRAY output_buf, int num_rows)
1.460 +{
1.461 + switch (cinfo->out_color_space) {
1.462 + case JCS_EXT_RGB:
1.463 + rgb_extrgb_convert_internal(cinfo, input_buf, input_row, output_buf,
1.464 + num_rows);
1.465 + break;
1.466 + case JCS_EXT_RGBX:
1.467 + case JCS_EXT_RGBA:
1.468 + rgb_extrgbx_convert_internal(cinfo, input_buf, input_row, output_buf,
1.469 + num_rows);
1.470 + break;
1.471 + case JCS_EXT_BGR:
1.472 + rgb_extbgr_convert_internal(cinfo, input_buf, input_row, output_buf,
1.473 + num_rows);
1.474 + break;
1.475 + case JCS_EXT_BGRX:
1.476 + case JCS_EXT_BGRA:
1.477 + rgb_extbgrx_convert_internal(cinfo, input_buf, input_row, output_buf,
1.478 + num_rows);
1.479 + break;
1.480 + case JCS_EXT_XBGR:
1.481 + case JCS_EXT_ABGR:
1.482 + rgb_extxbgr_convert_internal(cinfo, input_buf, input_row, output_buf,
1.483 + num_rows);
1.484 + break;
1.485 + case JCS_EXT_XRGB:
1.486 + case JCS_EXT_ARGB:
1.487 + rgb_extxrgb_convert_internal(cinfo, input_buf, input_row, output_buf,
1.488 + num_rows);
1.489 + break;
1.490 + default:
1.491 + rgb_rgb_convert_internal(cinfo, input_buf, input_row, output_buf,
1.492 + num_rows);
1.493 + break;
1.494 + }
1.495 +}
1.496 +
1.497 +
1.498 +/*
1.499 + * Adobe-style YCCK->CMYK conversion.
1.500 + * We convert YCbCr to R=1-C, G=1-M, and B=1-Y using the same
1.501 + * conversion as above, while passing K (black) unchanged.
1.502 + * We assume build_ycc_rgb_table has been called.
1.503 + */
1.504 +
1.505 +METHODDEF(void)
1.506 +ycck_cmyk_convert (j_decompress_ptr cinfo,
1.507 + JSAMPIMAGE input_buf, JDIMENSION input_row,
1.508 + JSAMPARRAY output_buf, int num_rows)
1.509 +{
1.510 + my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
1.511 + register int y, cb, cr;
1.512 + register JSAMPROW outptr;
1.513 + register JSAMPROW inptr0, inptr1, inptr2, inptr3;
1.514 + register JDIMENSION col;
1.515 + JDIMENSION num_cols = cinfo->output_width;
1.516 + /* copy these pointers into registers if possible */
1.517 + register JSAMPLE * range_limit = cinfo->sample_range_limit;
1.518 + register int * Crrtab = cconvert->Cr_r_tab;
1.519 + register int * Cbbtab = cconvert->Cb_b_tab;
1.520 + register INT32 * Crgtab = cconvert->Cr_g_tab;
1.521 + register INT32 * Cbgtab = cconvert->Cb_g_tab;
1.522 + SHIFT_TEMPS
1.523 +
1.524 + while (--num_rows >= 0) {
1.525 + inptr0 = input_buf[0][input_row];
1.526 + inptr1 = input_buf[1][input_row];
1.527 + inptr2 = input_buf[2][input_row];
1.528 + inptr3 = input_buf[3][input_row];
1.529 + input_row++;
1.530 + outptr = *output_buf++;
1.531 + for (col = 0; col < num_cols; col++) {
1.532 + y = GETJSAMPLE(inptr0[col]);
1.533 + cb = GETJSAMPLE(inptr1[col]);
1.534 + cr = GETJSAMPLE(inptr2[col]);
1.535 + /* Range-limiting is essential due to noise introduced by DCT losses. */
1.536 + outptr[0] = range_limit[MAXJSAMPLE - (y + Crrtab[cr])]; /* red */
1.537 + outptr[1] = range_limit[MAXJSAMPLE - (y + /* green */
1.538 + ((int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr],
1.539 + SCALEBITS)))];
1.540 + outptr[2] = range_limit[MAXJSAMPLE - (y + Cbbtab[cb])]; /* blue */
1.541 + /* K passes through unchanged */
1.542 + outptr[3] = inptr3[col]; /* don't need GETJSAMPLE here */
1.543 + outptr += 4;
1.544 + }
1.545 + }
1.546 +}
1.547 +
1.548 +
1.549 +/*
1.550 + * Empty method for start_pass.
1.551 + */
1.552 +
1.553 +METHODDEF(void)
1.554 +start_pass_dcolor (j_decompress_ptr cinfo)
1.555 +{
1.556 + /* no work needed */
1.557 +}
1.558 +
1.559 +
1.560 +/*
1.561 + * Module initialization routine for output colorspace conversion.
1.562 + */
1.563 +
1.564 +GLOBAL(void)
1.565 +jinit_color_deconverter (j_decompress_ptr cinfo)
1.566 +{
1.567 + my_cconvert_ptr cconvert;
1.568 + int ci;
1.569 +
1.570 + cconvert = (my_cconvert_ptr)
1.571 + (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
1.572 + SIZEOF(my_color_deconverter));
1.573 + cinfo->cconvert = (struct jpeg_color_deconverter *) cconvert;
1.574 + cconvert->pub.start_pass = start_pass_dcolor;
1.575 +
1.576 + /* Make sure num_components agrees with jpeg_color_space */
1.577 + switch (cinfo->jpeg_color_space) {
1.578 + case JCS_GRAYSCALE:
1.579 + if (cinfo->num_components != 1)
1.580 + ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
1.581 + break;
1.582 +
1.583 + case JCS_RGB:
1.584 + case JCS_YCbCr:
1.585 + if (cinfo->num_components != 3)
1.586 + ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
1.587 + break;
1.588 +
1.589 + case JCS_CMYK:
1.590 + case JCS_YCCK:
1.591 + if (cinfo->num_components != 4)
1.592 + ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
1.593 + break;
1.594 +
1.595 + default: /* JCS_UNKNOWN can be anything */
1.596 + if (cinfo->num_components < 1)
1.597 + ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
1.598 + break;
1.599 + }
1.600 +
1.601 + /* Set out_color_components and conversion method based on requested space.
1.602 + * Also clear the component_needed flags for any unused components,
1.603 + * so that earlier pipeline stages can avoid useless computation.
1.604 + */
1.605 +
1.606 + switch (cinfo->out_color_space) {
1.607 + case JCS_GRAYSCALE:
1.608 + cinfo->out_color_components = 1;
1.609 + if (cinfo->jpeg_color_space == JCS_GRAYSCALE ||
1.610 + cinfo->jpeg_color_space == JCS_YCbCr) {
1.611 + cconvert->pub.color_convert = grayscale_convert;
1.612 + /* For color->grayscale conversion, only the Y (0) component is needed */
1.613 + for (ci = 1; ci < cinfo->num_components; ci++)
1.614 + cinfo->comp_info[ci].component_needed = FALSE;
1.615 + } else if (cinfo->jpeg_color_space == JCS_RGB) {
1.616 + cconvert->pub.color_convert = rgb_gray_convert;
1.617 + build_rgb_y_table(cinfo);
1.618 + } else
1.619 + ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
1.620 + break;
1.621 +
1.622 + case JCS_RGB:
1.623 + case JCS_EXT_RGB:
1.624 + case JCS_EXT_RGBX:
1.625 + case JCS_EXT_BGR:
1.626 + case JCS_EXT_BGRX:
1.627 + case JCS_EXT_XBGR:
1.628 + case JCS_EXT_XRGB:
1.629 + case JCS_EXT_RGBA:
1.630 + case JCS_EXT_BGRA:
1.631 + case JCS_EXT_ABGR:
1.632 + case JCS_EXT_ARGB:
1.633 + cinfo->out_color_components = rgb_pixelsize[cinfo->out_color_space];
1.634 + if (cinfo->jpeg_color_space == JCS_YCbCr) {
1.635 + if (jsimd_can_ycc_rgb())
1.636 + cconvert->pub.color_convert = jsimd_ycc_rgb_convert;
1.637 + else {
1.638 + cconvert->pub.color_convert = ycc_rgb_convert;
1.639 + build_ycc_rgb_table(cinfo);
1.640 + }
1.641 + } else if (cinfo->jpeg_color_space == JCS_GRAYSCALE) {
1.642 + cconvert->pub.color_convert = gray_rgb_convert;
1.643 + } else if (cinfo->jpeg_color_space == JCS_RGB) {
1.644 + if (rgb_red[cinfo->out_color_space] == 0 &&
1.645 + rgb_green[cinfo->out_color_space] == 1 &&
1.646 + rgb_blue[cinfo->out_color_space] == 2 &&
1.647 + rgb_pixelsize[cinfo->out_color_space] == 3)
1.648 + cconvert->pub.color_convert = null_convert;
1.649 + else
1.650 + cconvert->pub.color_convert = rgb_rgb_convert;
1.651 + } else
1.652 + ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
1.653 + break;
1.654 +
1.655 + case JCS_CMYK:
1.656 + cinfo->out_color_components = 4;
1.657 + if (cinfo->jpeg_color_space == JCS_YCCK) {
1.658 + cconvert->pub.color_convert = ycck_cmyk_convert;
1.659 + build_ycc_rgb_table(cinfo);
1.660 + } else if (cinfo->jpeg_color_space == JCS_CMYK) {
1.661 + cconvert->pub.color_convert = null_convert;
1.662 + } else
1.663 + ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
1.664 + break;
1.665 +
1.666 + default:
1.667 + /* Permit null conversion to same output space */
1.668 + if (cinfo->out_color_space == cinfo->jpeg_color_space) {
1.669 + cinfo->out_color_components = cinfo->num_components;
1.670 + cconvert->pub.color_convert = null_convert;
1.671 + } else /* unsupported non-null conversion */
1.672 + ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
1.673 + break;
1.674 + }
1.675 +
1.676 + if (cinfo->quantize_colors)
1.677 + cinfo->output_components = 1; /* single colormapped output component */
1.678 + else
1.679 + cinfo->output_components = cinfo->out_color_components;
1.680 +}
