1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/libjpeg/jccolor.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,662 @@
1.4 +/*
1.5 + * jccolor.c
1.6 + *
1.7 + * This file was part of the Independent JPEG Group's software:
1.8 + * Copyright (C) 1991-1996, Thomas G. Lane.
1.9 + * libjpeg-turbo Modifications:
1.10 + * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
1.11 + * Copyright (C) 2009-2012, D. R. Commander.
1.12 + * For conditions of distribution and use, see the accompanying README file.
1.13 + *
1.14 + * This file contains input colorspace conversion routines.
1.15 + */
1.16 +
1.17 +#define JPEG_INTERNALS
1.18 +#include "jinclude.h"
1.19 +#include "jpeglib.h"
1.20 +#include "jsimd.h"
1.21 +#include "config.h"
1.22 +
1.23 +
1.24 +/* Private subobject */
1.25 +
1.26 +typedef struct {
1.27 + struct jpeg_color_converter pub; /* public fields */
1.28 +
1.29 + /* Private state for RGB->YCC conversion */
1.30 + INT32 * rgb_ycc_tab; /* => table for RGB to YCbCr conversion */
1.31 +} my_color_converter;
1.32 +
1.33 +typedef my_color_converter * my_cconvert_ptr;
1.34 +
1.35 +
1.36 +/**************** RGB -> YCbCr conversion: most common case **************/
1.37 +
1.38 +/*
1.39 + * YCbCr is defined per CCIR 601-1, except that Cb and Cr are
1.40 + * normalized to the range 0..MAXJSAMPLE rather than -0.5 .. 0.5.
1.41 + * The conversion equations to be implemented are therefore
1.42 + * Y = 0.29900 * R + 0.58700 * G + 0.11400 * B
1.43 + * Cb = -0.16874 * R - 0.33126 * G + 0.50000 * B + CENTERJSAMPLE
1.44 + * Cr = 0.50000 * R - 0.41869 * G - 0.08131 * B + CENTERJSAMPLE
1.45 + * (These numbers are derived from TIFF 6.0 section 21, dated 3-June-92.)
1.46 + * Note: older versions of the IJG code used a zero offset of MAXJSAMPLE/2,
1.47 + * rather than CENTERJSAMPLE, for Cb and Cr. This gave equal positive and
1.48 + * negative swings for Cb/Cr, but meant that grayscale values (Cb=Cr=0)
1.49 + * were not represented exactly. Now we sacrifice exact representation of
1.50 + * maximum red and maximum blue in order to get exact grayscales.
1.51 + *
1.52 + * To avoid floating-point arithmetic, we represent the fractional constants
1.53 + * as integers scaled up by 2^16 (about 4 digits precision); we have to divide
1.54 + * the products by 2^16, with appropriate rounding, to get the correct answer.
1.55 + *
1.56 + * For even more speed, we avoid doing any multiplications in the inner loop
1.57 + * by precalculating the constants times R,G,B for all possible values.
1.58 + * For 8-bit JSAMPLEs this is very reasonable (only 256 entries per table);
1.59 + * for 12-bit samples it is still acceptable. It's not very reasonable for
1.60 + * 16-bit samples, but if you want lossless storage you shouldn't be changing
1.61 + * colorspace anyway.
1.62 + * The CENTERJSAMPLE offsets and the rounding fudge-factor of 0.5 are included
1.63 + * in the tables to save adding them separately in the inner loop.
1.64 + */
1.65 +
1.66 +#define SCALEBITS 16 /* speediest right-shift on some machines */
1.67 +#define CBCR_OFFSET ((INT32) CENTERJSAMPLE << SCALEBITS)
1.68 +#define ONE_HALF ((INT32) 1 << (SCALEBITS-1))
1.69 +#define FIX(x) ((INT32) ((x) * (1L<<SCALEBITS) + 0.5))
1.70 +
1.71 +/* We allocate one big table and divide it up into eight parts, instead of
1.72 + * doing eight alloc_small requests. This lets us use a single table base
1.73 + * address, which can be held in a register in the inner loops on many
1.74 + * machines (more than can hold all eight addresses, anyway).
1.75 + */
1.76 +
1.77 +#define R_Y_OFF 0 /* offset to R => Y section */
1.78 +#define G_Y_OFF (1*(MAXJSAMPLE+1)) /* offset to G => Y section */
1.79 +#define B_Y_OFF (2*(MAXJSAMPLE+1)) /* etc. */
1.80 +#define R_CB_OFF (3*(MAXJSAMPLE+1))
1.81 +#define G_CB_OFF (4*(MAXJSAMPLE+1))
1.82 +#define B_CB_OFF (5*(MAXJSAMPLE+1))
1.83 +#define R_CR_OFF B_CB_OFF /* B=>Cb, R=>Cr are the same */
1.84 +#define G_CR_OFF (6*(MAXJSAMPLE+1))
1.85 +#define B_CR_OFF (7*(MAXJSAMPLE+1))
1.86 +#define TABLE_SIZE (8*(MAXJSAMPLE+1))
1.87 +
1.88 +
1.89 +/* Include inline routines for colorspace extensions */
1.90 +
1.91 +#include "jccolext.c"
1.92 +#undef RGB_RED
1.93 +#undef RGB_GREEN
1.94 +#undef RGB_BLUE
1.95 +#undef RGB_PIXELSIZE
1.96 +
1.97 +#define RGB_RED EXT_RGB_RED
1.98 +#define RGB_GREEN EXT_RGB_GREEN
1.99 +#define RGB_BLUE EXT_RGB_BLUE
1.100 +#define RGB_PIXELSIZE EXT_RGB_PIXELSIZE
1.101 +#define rgb_ycc_convert_internal extrgb_ycc_convert_internal
1.102 +#define rgb_gray_convert_internal extrgb_gray_convert_internal
1.103 +#define rgb_rgb_convert_internal extrgb_rgb_convert_internal
1.104 +#include "jccolext.c"
1.105 +#undef RGB_RED
1.106 +#undef RGB_GREEN
1.107 +#undef RGB_BLUE
1.108 +#undef RGB_PIXELSIZE
1.109 +#undef rgb_ycc_convert_internal
1.110 +#undef rgb_gray_convert_internal
1.111 +#undef rgb_rgb_convert_internal
1.112 +
1.113 +#define RGB_RED EXT_RGBX_RED
1.114 +#define RGB_GREEN EXT_RGBX_GREEN
1.115 +#define RGB_BLUE EXT_RGBX_BLUE
1.116 +#define RGB_PIXELSIZE EXT_RGBX_PIXELSIZE
1.117 +#define rgb_ycc_convert_internal extrgbx_ycc_convert_internal
1.118 +#define rgb_gray_convert_internal extrgbx_gray_convert_internal
1.119 +#define rgb_rgb_convert_internal extrgbx_rgb_convert_internal
1.120 +#include "jccolext.c"
1.121 +#undef RGB_RED
1.122 +#undef RGB_GREEN
1.123 +#undef RGB_BLUE
1.124 +#undef RGB_PIXELSIZE
1.125 +#undef rgb_ycc_convert_internal
1.126 +#undef rgb_gray_convert_internal
1.127 +#undef rgb_rgb_convert_internal
1.128 +
1.129 +#define RGB_RED EXT_BGR_RED
1.130 +#define RGB_GREEN EXT_BGR_GREEN
1.131 +#define RGB_BLUE EXT_BGR_BLUE
1.132 +#define RGB_PIXELSIZE EXT_BGR_PIXELSIZE
1.133 +#define rgb_ycc_convert_internal extbgr_ycc_convert_internal
1.134 +#define rgb_gray_convert_internal extbgr_gray_convert_internal
1.135 +#define rgb_rgb_convert_internal extbgr_rgb_convert_internal
1.136 +#include "jccolext.c"
1.137 +#undef RGB_RED
1.138 +#undef RGB_GREEN
1.139 +#undef RGB_BLUE
1.140 +#undef RGB_PIXELSIZE
1.141 +#undef rgb_ycc_convert_internal
1.142 +#undef rgb_gray_convert_internal
1.143 +#undef rgb_rgb_convert_internal
1.144 +
1.145 +#define RGB_RED EXT_BGRX_RED
1.146 +#define RGB_GREEN EXT_BGRX_GREEN
1.147 +#define RGB_BLUE EXT_BGRX_BLUE
1.148 +#define RGB_PIXELSIZE EXT_BGRX_PIXELSIZE
1.149 +#define rgb_ycc_convert_internal extbgrx_ycc_convert_internal
1.150 +#define rgb_gray_convert_internal extbgrx_gray_convert_internal
1.151 +#define rgb_rgb_convert_internal extbgrx_rgb_convert_internal
1.152 +#include "jccolext.c"
1.153 +#undef RGB_RED
1.154 +#undef RGB_GREEN
1.155 +#undef RGB_BLUE
1.156 +#undef RGB_PIXELSIZE
1.157 +#undef rgb_ycc_convert_internal
1.158 +#undef rgb_gray_convert_internal
1.159 +#undef rgb_rgb_convert_internal
1.160 +
1.161 +#define RGB_RED EXT_XBGR_RED
1.162 +#define RGB_GREEN EXT_XBGR_GREEN
1.163 +#define RGB_BLUE EXT_XBGR_BLUE
1.164 +#define RGB_PIXELSIZE EXT_XBGR_PIXELSIZE
1.165 +#define rgb_ycc_convert_internal extxbgr_ycc_convert_internal
1.166 +#define rgb_gray_convert_internal extxbgr_gray_convert_internal
1.167 +#define rgb_rgb_convert_internal extxbgr_rgb_convert_internal
1.168 +#include "jccolext.c"
1.169 +#undef RGB_RED
1.170 +#undef RGB_GREEN
1.171 +#undef RGB_BLUE
1.172 +#undef RGB_PIXELSIZE
1.173 +#undef rgb_ycc_convert_internal
1.174 +#undef rgb_gray_convert_internal
1.175 +#undef rgb_rgb_convert_internal
1.176 +
1.177 +#define RGB_RED EXT_XRGB_RED
1.178 +#define RGB_GREEN EXT_XRGB_GREEN
1.179 +#define RGB_BLUE EXT_XRGB_BLUE
1.180 +#define RGB_PIXELSIZE EXT_XRGB_PIXELSIZE
1.181 +#define rgb_ycc_convert_internal extxrgb_ycc_convert_internal
1.182 +#define rgb_gray_convert_internal extxrgb_gray_convert_internal
1.183 +#define rgb_rgb_convert_internal extxrgb_rgb_convert_internal
1.184 +#include "jccolext.c"
1.185 +#undef RGB_RED
1.186 +#undef RGB_GREEN
1.187 +#undef RGB_BLUE
1.188 +#undef RGB_PIXELSIZE
1.189 +#undef rgb_ycc_convert_internal
1.190 +#undef rgb_gray_convert_internal
1.191 +#undef rgb_rgb_convert_internal
1.192 +
1.193 +
1.194 +/*
1.195 + * Initialize for RGB->YCC colorspace conversion.
1.196 + */
1.197 +
1.198 +METHODDEF(void)
1.199 +rgb_ycc_start (j_compress_ptr cinfo)
1.200 +{
1.201 + my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
1.202 + INT32 * rgb_ycc_tab;
1.203 + INT32 i;
1.204 +
1.205 + /* Allocate and fill in the conversion tables. */
1.206 + cconvert->rgb_ycc_tab = rgb_ycc_tab = (INT32 *)
1.207 + (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
1.208 + (TABLE_SIZE * SIZEOF(INT32)));
1.209 +
1.210 + for (i = 0; i <= MAXJSAMPLE; i++) {
1.211 + rgb_ycc_tab[i+R_Y_OFF] = FIX(0.29900) * i;
1.212 + rgb_ycc_tab[i+G_Y_OFF] = FIX(0.58700) * i;
1.213 + rgb_ycc_tab[i+B_Y_OFF] = FIX(0.11400) * i + ONE_HALF;
1.214 + rgb_ycc_tab[i+R_CB_OFF] = (-FIX(0.16874)) * i;
1.215 + rgb_ycc_tab[i+G_CB_OFF] = (-FIX(0.33126)) * i;
1.216 + /* We use a rounding fudge-factor of 0.5-epsilon for Cb and Cr.
1.217 + * This ensures that the maximum output will round to MAXJSAMPLE
1.218 + * not MAXJSAMPLE+1, and thus that we don't have to range-limit.
1.219 + */
1.220 + rgb_ycc_tab[i+B_CB_OFF] = FIX(0.50000) * i + CBCR_OFFSET + ONE_HALF-1;
1.221 +/* B=>Cb and R=>Cr tables are the same
1.222 + rgb_ycc_tab[i+R_CR_OFF] = FIX(0.50000) * i + CBCR_OFFSET + ONE_HALF-1;
1.223 +*/
1.224 + rgb_ycc_tab[i+G_CR_OFF] = (-FIX(0.41869)) * i;
1.225 + rgb_ycc_tab[i+B_CR_OFF] = (-FIX(0.08131)) * i;
1.226 + }
1.227 +}
1.228 +
1.229 +
1.230 +/*
1.231 + * Convert some rows of samples to the JPEG colorspace.
1.232 + */
1.233 +
1.234 +METHODDEF(void)
1.235 +rgb_ycc_convert (j_compress_ptr cinfo,
1.236 + JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
1.237 + JDIMENSION output_row, int num_rows)
1.238 +{
1.239 + switch (cinfo->in_color_space) {
1.240 + case JCS_EXT_RGB:
1.241 + extrgb_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
1.242 + num_rows);
1.243 + break;
1.244 + case JCS_EXT_RGBX:
1.245 + case JCS_EXT_RGBA:
1.246 + extrgbx_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
1.247 + num_rows);
1.248 + break;
1.249 + case JCS_EXT_BGR:
1.250 + extbgr_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
1.251 + num_rows);
1.252 + break;
1.253 + case JCS_EXT_BGRX:
1.254 + case JCS_EXT_BGRA:
1.255 + extbgrx_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
1.256 + num_rows);
1.257 + break;
1.258 + case JCS_EXT_XBGR:
1.259 + case JCS_EXT_ABGR:
1.260 + extxbgr_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
1.261 + num_rows);
1.262 + break;
1.263 + case JCS_EXT_XRGB:
1.264 + case JCS_EXT_ARGB:
1.265 + extxrgb_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
1.266 + num_rows);
1.267 + break;
1.268 + default:
1.269 + rgb_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
1.270 + num_rows);
1.271 + break;
1.272 + }
1.273 +}
1.274 +
1.275 +
1.276 +/**************** Cases other than RGB -> YCbCr **************/
1.277 +
1.278 +
1.279 +/*
1.280 + * Convert some rows of samples to the JPEG colorspace.
1.281 + */
1.282 +
1.283 +METHODDEF(void)
1.284 +rgb_gray_convert (j_compress_ptr cinfo,
1.285 + JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
1.286 + JDIMENSION output_row, int num_rows)
1.287 +{
1.288 + switch (cinfo->in_color_space) {
1.289 + case JCS_EXT_RGB:
1.290 + extrgb_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
1.291 + num_rows);
1.292 + break;
1.293 + case JCS_EXT_RGBX:
1.294 + case JCS_EXT_RGBA:
1.295 + extrgbx_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
1.296 + num_rows);
1.297 + break;
1.298 + case JCS_EXT_BGR:
1.299 + extbgr_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
1.300 + num_rows);
1.301 + break;
1.302 + case JCS_EXT_BGRX:
1.303 + case JCS_EXT_BGRA:
1.304 + extbgrx_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
1.305 + num_rows);
1.306 + break;
1.307 + case JCS_EXT_XBGR:
1.308 + case JCS_EXT_ABGR:
1.309 + extxbgr_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
1.310 + num_rows);
1.311 + break;
1.312 + case JCS_EXT_XRGB:
1.313 + case JCS_EXT_ARGB:
1.314 + extxrgb_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
1.315 + num_rows);
1.316 + break;
1.317 + default:
1.318 + rgb_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
1.319 + num_rows);
1.320 + break;
1.321 + }
1.322 +}
1.323 +
1.324 +
1.325 +/*
1.326 + * Extended RGB to plain RGB conversion
1.327 + */
1.328 +
1.329 +METHODDEF(void)
1.330 +rgb_rgb_convert (j_compress_ptr cinfo,
1.331 + JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
1.332 + JDIMENSION output_row, int num_rows)
1.333 +{
1.334 + switch (cinfo->in_color_space) {
1.335 + case JCS_EXT_RGB:
1.336 + extrgb_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
1.337 + num_rows);
1.338 + break;
1.339 + case JCS_EXT_RGBX:
1.340 + case JCS_EXT_RGBA:
1.341 + extrgbx_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
1.342 + num_rows);
1.343 + break;
1.344 + case JCS_EXT_BGR:
1.345 + extbgr_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
1.346 + num_rows);
1.347 + break;
1.348 + case JCS_EXT_BGRX:
1.349 + case JCS_EXT_BGRA:
1.350 + extbgrx_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
1.351 + num_rows);
1.352 + break;
1.353 + case JCS_EXT_XBGR:
1.354 + case JCS_EXT_ABGR:
1.355 + extxbgr_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
1.356 + num_rows);
1.357 + break;
1.358 + case JCS_EXT_XRGB:
1.359 + case JCS_EXT_ARGB:
1.360 + extxrgb_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
1.361 + num_rows);
1.362 + break;
1.363 + default:
1.364 + rgb_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
1.365 + num_rows);
1.366 + break;
1.367 + }
1.368 +}
1.369 +
1.370 +
1.371 +/*
1.372 + * Convert some rows of samples to the JPEG colorspace.
1.373 + * This version handles Adobe-style CMYK->YCCK conversion,
1.374 + * where we convert R=1-C, G=1-M, and B=1-Y to YCbCr using the same
1.375 + * conversion as above, while passing K (black) unchanged.
1.376 + * We assume rgb_ycc_start has been called.
1.377 + */
1.378 +
1.379 +METHODDEF(void)
1.380 +cmyk_ycck_convert (j_compress_ptr cinfo,
1.381 + JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
1.382 + JDIMENSION output_row, int num_rows)
1.383 +{
1.384 + my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
1.385 + register int r, g, b;
1.386 + register INT32 * ctab = cconvert->rgb_ycc_tab;
1.387 + register JSAMPROW inptr;
1.388 + register JSAMPROW outptr0, outptr1, outptr2, outptr3;
1.389 + register JDIMENSION col;
1.390 + JDIMENSION num_cols = cinfo->image_width;
1.391 +
1.392 + while (--num_rows >= 0) {
1.393 + inptr = *input_buf++;
1.394 + outptr0 = output_buf[0][output_row];
1.395 + outptr1 = output_buf[1][output_row];
1.396 + outptr2 = output_buf[2][output_row];
1.397 + outptr3 = output_buf[3][output_row];
1.398 + output_row++;
1.399 + for (col = 0; col < num_cols; col++) {
1.400 + r = MAXJSAMPLE - GETJSAMPLE(inptr[0]);
1.401 + g = MAXJSAMPLE - GETJSAMPLE(inptr[1]);
1.402 + b = MAXJSAMPLE - GETJSAMPLE(inptr[2]);
1.403 + /* K passes through as-is */
1.404 + outptr3[col] = inptr[3]; /* don't need GETJSAMPLE here */
1.405 + inptr += 4;
1.406 + /* If the inputs are 0..MAXJSAMPLE, the outputs of these equations
1.407 + * must be too; we do not need an explicit range-limiting operation.
1.408 + * Hence the value being shifted is never negative, and we don't
1.409 + * need the general RIGHT_SHIFT macro.
1.410 + */
1.411 + /* Y */
1.412 + outptr0[col] = (JSAMPLE)
1.413 + ((ctab[r+R_Y_OFF] + ctab[g+G_Y_OFF] + ctab[b+B_Y_OFF])
1.414 + >> SCALEBITS);
1.415 + /* Cb */
1.416 + outptr1[col] = (JSAMPLE)
1.417 + ((ctab[r+R_CB_OFF] + ctab[g+G_CB_OFF] + ctab[b+B_CB_OFF])
1.418 + >> SCALEBITS);
1.419 + /* Cr */
1.420 + outptr2[col] = (JSAMPLE)
1.421 + ((ctab[r+R_CR_OFF] + ctab[g+G_CR_OFF] + ctab[b+B_CR_OFF])
1.422 + >> SCALEBITS);
1.423 + }
1.424 + }
1.425 +}
1.426 +
1.427 +
1.428 +/*
1.429 + * Convert some rows of samples to the JPEG colorspace.
1.430 + * This version handles grayscale output with no conversion.
1.431 + * The source can be either plain grayscale or YCbCr (since Y == gray).
1.432 + */
1.433 +
1.434 +METHODDEF(void)
1.435 +grayscale_convert (j_compress_ptr cinfo,
1.436 + JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
1.437 + JDIMENSION output_row, int num_rows)
1.438 +{
1.439 + register JSAMPROW inptr;
1.440 + register JSAMPROW outptr;
1.441 + register JDIMENSION col;
1.442 + JDIMENSION num_cols = cinfo->image_width;
1.443 + int instride = cinfo->input_components;
1.444 +
1.445 + while (--num_rows >= 0) {
1.446 + inptr = *input_buf++;
1.447 + outptr = output_buf[0][output_row];
1.448 + output_row++;
1.449 + for (col = 0; col < num_cols; col++) {
1.450 + outptr[col] = inptr[0]; /* don't need GETJSAMPLE() here */
1.451 + inptr += instride;
1.452 + }
1.453 + }
1.454 +}
1.455 +
1.456 +
1.457 +/*
1.458 + * Convert some rows of samples to the JPEG colorspace.
1.459 + * This version handles multi-component colorspaces without conversion.
1.460 + * We assume input_components == num_components.
1.461 + */
1.462 +
1.463 +METHODDEF(void)
1.464 +null_convert (j_compress_ptr cinfo,
1.465 + JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
1.466 + JDIMENSION output_row, int num_rows)
1.467 +{
1.468 + register JSAMPROW inptr;
1.469 + register JSAMPROW outptr;
1.470 + register JDIMENSION col;
1.471 + register int ci;
1.472 + int nc = cinfo->num_components;
1.473 + JDIMENSION num_cols = cinfo->image_width;
1.474 +
1.475 + while (--num_rows >= 0) {
1.476 + /* It seems fastest to make a separate pass for each component. */
1.477 + for (ci = 0; ci < nc; ci++) {
1.478 + inptr = *input_buf;
1.479 + outptr = output_buf[ci][output_row];
1.480 + for (col = 0; col < num_cols; col++) {
1.481 + outptr[col] = inptr[ci]; /* don't need GETJSAMPLE() here */
1.482 + inptr += nc;
1.483 + }
1.484 + }
1.485 + input_buf++;
1.486 + output_row++;
1.487 + }
1.488 +}
1.489 +
1.490 +
1.491 +/*
1.492 + * Empty method for start_pass.
1.493 + */
1.494 +
1.495 +METHODDEF(void)
1.496 +null_method (j_compress_ptr cinfo)
1.497 +{
1.498 + /* no work needed */
1.499 +}
1.500 +
1.501 +
1.502 +/*
1.503 + * Module initialization routine for input colorspace conversion.
1.504 + */
1.505 +
1.506 +GLOBAL(void)
1.507 +jinit_color_converter (j_compress_ptr cinfo)
1.508 +{
1.509 + my_cconvert_ptr cconvert;
1.510 +
1.511 + cconvert = (my_cconvert_ptr)
1.512 + (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
1.513 + SIZEOF(my_color_converter));
1.514 + cinfo->cconvert = (struct jpeg_color_converter *) cconvert;
1.515 + /* set start_pass to null method until we find out differently */
1.516 + cconvert->pub.start_pass = null_method;
1.517 +
1.518 + /* Make sure input_components agrees with in_color_space */
1.519 + switch (cinfo->in_color_space) {
1.520 + case JCS_GRAYSCALE:
1.521 + if (cinfo->input_components != 1)
1.522 + ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
1.523 + break;
1.524 +
1.525 + case JCS_RGB:
1.526 + case JCS_EXT_RGB:
1.527 + case JCS_EXT_RGBX:
1.528 + case JCS_EXT_BGR:
1.529 + case JCS_EXT_BGRX:
1.530 + case JCS_EXT_XBGR:
1.531 + case JCS_EXT_XRGB:
1.532 + case JCS_EXT_RGBA:
1.533 + case JCS_EXT_BGRA:
1.534 + case JCS_EXT_ABGR:
1.535 + case JCS_EXT_ARGB:
1.536 + if (cinfo->input_components != rgb_pixelsize[cinfo->in_color_space])
1.537 + ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
1.538 + break;
1.539 +
1.540 + case JCS_YCbCr:
1.541 + if (cinfo->input_components != 3)
1.542 + ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
1.543 + break;
1.544 +
1.545 + case JCS_CMYK:
1.546 + case JCS_YCCK:
1.547 + if (cinfo->input_components != 4)
1.548 + ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
1.549 + break;
1.550 +
1.551 + default: /* JCS_UNKNOWN can be anything */
1.552 + if (cinfo->input_components < 1)
1.553 + ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
1.554 + break;
1.555 + }
1.556 +
1.557 + /* Check num_components, set conversion method based on requested space */
1.558 + switch (cinfo->jpeg_color_space) {
1.559 + case JCS_GRAYSCALE:
1.560 + if (cinfo->num_components != 1)
1.561 + ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
1.562 + if (cinfo->in_color_space == JCS_GRAYSCALE)
1.563 + cconvert->pub.color_convert = grayscale_convert;
1.564 + else if (cinfo->in_color_space == JCS_RGB ||
1.565 + cinfo->in_color_space == JCS_EXT_RGB ||
1.566 + cinfo->in_color_space == JCS_EXT_RGBX ||
1.567 + cinfo->in_color_space == JCS_EXT_BGR ||
1.568 + cinfo->in_color_space == JCS_EXT_BGRX ||
1.569 + cinfo->in_color_space == JCS_EXT_XBGR ||
1.570 + cinfo->in_color_space == JCS_EXT_XRGB ||
1.571 + cinfo->in_color_space == JCS_EXT_RGBA ||
1.572 + cinfo->in_color_space == JCS_EXT_BGRA ||
1.573 + cinfo->in_color_space == JCS_EXT_ABGR ||
1.574 + cinfo->in_color_space == JCS_EXT_ARGB) {
1.575 + if (jsimd_can_rgb_gray())
1.576 + cconvert->pub.color_convert = jsimd_rgb_gray_convert;
1.577 + else {
1.578 + cconvert->pub.start_pass = rgb_ycc_start;
1.579 + cconvert->pub.color_convert = rgb_gray_convert;
1.580 + }
1.581 + } else if (cinfo->in_color_space == JCS_YCbCr)
1.582 + cconvert->pub.color_convert = grayscale_convert;
1.583 + else
1.584 + ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
1.585 + break;
1.586 +
1.587 + case JCS_RGB:
1.588 + if (cinfo->num_components != 3)
1.589 + ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
1.590 + if (rgb_red[cinfo->in_color_space] == 0 &&
1.591 + rgb_green[cinfo->in_color_space] == 1 &&
1.592 + rgb_blue[cinfo->in_color_space] == 2 &&
1.593 + rgb_pixelsize[cinfo->in_color_space] == 3)
1.594 + cconvert->pub.color_convert = null_convert;
1.595 + else if (cinfo->in_color_space == JCS_RGB ||
1.596 + cinfo->in_color_space == JCS_EXT_RGB ||
1.597 + cinfo->in_color_space == JCS_EXT_RGBX ||
1.598 + cinfo->in_color_space == JCS_EXT_BGR ||
1.599 + cinfo->in_color_space == JCS_EXT_BGRX ||
1.600 + cinfo->in_color_space == JCS_EXT_XBGR ||
1.601 + cinfo->in_color_space == JCS_EXT_XRGB ||
1.602 + cinfo->in_color_space == JCS_EXT_RGBA ||
1.603 + cinfo->in_color_space == JCS_EXT_BGRA ||
1.604 + cinfo->in_color_space == JCS_EXT_ABGR ||
1.605 + cinfo->in_color_space == JCS_EXT_ARGB)
1.606 + cconvert->pub.color_convert = rgb_rgb_convert;
1.607 + else
1.608 + ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
1.609 + break;
1.610 +
1.611 + case JCS_YCbCr:
1.612 + if (cinfo->num_components != 3)
1.613 + ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
1.614 + if (cinfo->in_color_space == JCS_RGB ||
1.615 + cinfo->in_color_space == JCS_EXT_RGB ||
1.616 + cinfo->in_color_space == JCS_EXT_RGBX ||
1.617 + cinfo->in_color_space == JCS_EXT_BGR ||
1.618 + cinfo->in_color_space == JCS_EXT_BGRX ||
1.619 + cinfo->in_color_space == JCS_EXT_XBGR ||
1.620 + cinfo->in_color_space == JCS_EXT_XRGB ||
1.621 + cinfo->in_color_space == JCS_EXT_RGBA ||
1.622 + cinfo->in_color_space == JCS_EXT_BGRA ||
1.623 + cinfo->in_color_space == JCS_EXT_ABGR ||
1.624 + cinfo->in_color_space == JCS_EXT_ARGB) {
1.625 + if (jsimd_can_rgb_ycc())
1.626 + cconvert->pub.color_convert = jsimd_rgb_ycc_convert;
1.627 + else {
1.628 + cconvert->pub.start_pass = rgb_ycc_start;
1.629 + cconvert->pub.color_convert = rgb_ycc_convert;
1.630 + }
1.631 + } else if (cinfo->in_color_space == JCS_YCbCr)
1.632 + cconvert->pub.color_convert = null_convert;
1.633 + else
1.634 + ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
1.635 + break;
1.636 +
1.637 + case JCS_CMYK:
1.638 + if (cinfo->num_components != 4)
1.639 + ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
1.640 + if (cinfo->in_color_space == JCS_CMYK)
1.641 + cconvert->pub.color_convert = null_convert;
1.642 + else
1.643 + ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
1.644 + break;
1.645 +
1.646 + case JCS_YCCK:
1.647 + if (cinfo->num_components != 4)
1.648 + ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
1.649 + if (cinfo->in_color_space == JCS_CMYK) {
1.650 + cconvert->pub.start_pass = rgb_ycc_start;
1.651 + cconvert->pub.color_convert = cmyk_ycck_convert;
1.652 + } else if (cinfo->in_color_space == JCS_YCCK)
1.653 + cconvert->pub.color_convert = null_convert;
1.654 + else
1.655 + ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
1.656 + break;
1.657 +
1.658 + default: /* allow null conversion of JCS_UNKNOWN */
1.659 + if (cinfo->jpeg_color_space != cinfo->in_color_space ||
1.660 + cinfo->num_components != cinfo->input_components)
1.661 + ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
1.662 + cconvert->pub.color_convert = null_convert;
1.663 + break;
1.664 + }
1.665 +}
