711 lines
23 KiB
C
711 lines
23 KiB
C
/*
|
|
* jccolor.c
|
|
*
|
|
* This file was part of the Independent JPEG Group's software:
|
|
* Copyright (C) 1991-1996, Thomas G. Lane.
|
|
* libjpeg-turbo Modifications:
|
|
* Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
|
|
* Copyright (C) 2009-2012, 2015, D. R. Commander.
|
|
* Copyright (C) 2014, MIPS Technologies, Inc., California.
|
|
* For conditions of distribution and use, see the accompanying README.ijg
|
|
* file.
|
|
*
|
|
* This file contains input colorspace conversion routines.
|
|
*/
|
|
|
|
#define JPEG_INTERNALS
|
|
#include "jinclude.h"
|
|
#include "jpeglib.h"
|
|
#include "jsimd.h"
|
|
#include "jconfigint.h"
|
|
|
|
|
|
/* Private subobject */
|
|
|
|
typedef struct {
|
|
struct jpeg_color_converter pub; /* public fields */
|
|
|
|
/* Private state for RGB->YCC conversion */
|
|
JLONG *rgb_ycc_tab; /* => table for RGB to YCbCr conversion */
|
|
} my_color_converter;
|
|
|
|
typedef my_color_converter *my_cconvert_ptr;
|
|
|
|
|
|
/**************** RGB -> YCbCr conversion: most common case **************/
|
|
|
|
/*
|
|
* YCbCr is defined per CCIR 601-1, except that Cb and Cr are
|
|
* normalized to the range 0..MAXJSAMPLE rather than -0.5 .. 0.5.
|
|
* The conversion equations to be implemented are therefore
|
|
* Y = 0.29900 * R + 0.58700 * G + 0.11400 * B
|
|
* Cb = -0.16874 * R - 0.33126 * G + 0.50000 * B + CENTERJSAMPLE
|
|
* Cr = 0.50000 * R - 0.41869 * G - 0.08131 * B + CENTERJSAMPLE
|
|
* (These numbers are derived from TIFF 6.0 section 21, dated 3-June-92.)
|
|
* Note: older versions of the IJG code used a zero offset of MAXJSAMPLE/2,
|
|
* rather than CENTERJSAMPLE, for Cb and Cr. This gave equal positive and
|
|
* negative swings for Cb/Cr, but meant that grayscale values (Cb=Cr=0)
|
|
* were not represented exactly. Now we sacrifice exact representation of
|
|
* maximum red and maximum blue in order to get exact grayscales.
|
|
*
|
|
* To avoid floating-point arithmetic, we represent the fractional constants
|
|
* as integers scaled up by 2^16 (about 4 digits precision); we have to divide
|
|
* the products by 2^16, with appropriate rounding, to get the correct answer.
|
|
*
|
|
* For even more speed, we avoid doing any multiplications in the inner loop
|
|
* by precalculating the constants times R,G,B for all possible values.
|
|
* For 8-bit JSAMPLEs this is very reasonable (only 256 entries per table);
|
|
* for 12-bit samples it is still acceptable. It's not very reasonable for
|
|
* 16-bit samples, but if you want lossless storage you shouldn't be changing
|
|
* colorspace anyway.
|
|
* The CENTERJSAMPLE offsets and the rounding fudge-factor of 0.5 are included
|
|
* in the tables to save adding them separately in the inner loop.
|
|
*/
|
|
|
|
#define SCALEBITS 16 /* speediest right-shift on some machines */
|
|
#define CBCR_OFFSET ((JLONG)CENTERJSAMPLE << SCALEBITS)
|
|
#define ONE_HALF ((JLONG)1 << (SCALEBITS - 1))
|
|
#define FIX(x) ((JLONG)((x) * (1L << SCALEBITS) + 0.5))
|
|
|
|
/* We allocate one big table and divide it up into eight parts, instead of
|
|
* doing eight alloc_small requests. This lets us use a single table base
|
|
* address, which can be held in a register in the inner loops on many
|
|
* machines (more than can hold all eight addresses, anyway).
|
|
*/
|
|
|
|
#define R_Y_OFF 0 /* offset to R => Y section */
|
|
#define G_Y_OFF (1 * (MAXJSAMPLE + 1)) /* offset to G => Y section */
|
|
#define B_Y_OFF (2 * (MAXJSAMPLE + 1)) /* etc. */
|
|
#define R_CB_OFF (3 * (MAXJSAMPLE + 1))
|
|
#define G_CB_OFF (4 * (MAXJSAMPLE + 1))
|
|
#define B_CB_OFF (5 * (MAXJSAMPLE + 1))
|
|
#define R_CR_OFF B_CB_OFF /* B=>Cb, R=>Cr are the same */
|
|
#define G_CR_OFF (6 * (MAXJSAMPLE + 1))
|
|
#define B_CR_OFF (7 * (MAXJSAMPLE + 1))
|
|
#define TABLE_SIZE (8 * (MAXJSAMPLE + 1))
|
|
|
|
|
|
/* Include inline routines for colorspace extensions */
|
|
|
|
#include "jccolext.c"
|
|
#undef RGB_RED
|
|
#undef RGB_GREEN
|
|
#undef RGB_BLUE
|
|
#undef RGB_PIXELSIZE
|
|
|
|
#define RGB_RED EXT_RGB_RED
|
|
#define RGB_GREEN EXT_RGB_GREEN
|
|
#define RGB_BLUE EXT_RGB_BLUE
|
|
#define RGB_PIXELSIZE EXT_RGB_PIXELSIZE
|
|
#define rgb_ycc_convert_internal extrgb_ycc_convert_internal
|
|
#define rgb_gray_convert_internal extrgb_gray_convert_internal
|
|
#define rgb_rgb_convert_internal extrgb_rgb_convert_internal
|
|
#include "jccolext.c"
|
|
#undef RGB_RED
|
|
#undef RGB_GREEN
|
|
#undef RGB_BLUE
|
|
#undef RGB_PIXELSIZE
|
|
#undef rgb_ycc_convert_internal
|
|
#undef rgb_gray_convert_internal
|
|
#undef rgb_rgb_convert_internal
|
|
|
|
#define RGB_RED EXT_RGBX_RED
|
|
#define RGB_GREEN EXT_RGBX_GREEN
|
|
#define RGB_BLUE EXT_RGBX_BLUE
|
|
#define RGB_PIXELSIZE EXT_RGBX_PIXELSIZE
|
|
#define rgb_ycc_convert_internal extrgbx_ycc_convert_internal
|
|
#define rgb_gray_convert_internal extrgbx_gray_convert_internal
|
|
#define rgb_rgb_convert_internal extrgbx_rgb_convert_internal
|
|
#include "jccolext.c"
|
|
#undef RGB_RED
|
|
#undef RGB_GREEN
|
|
#undef RGB_BLUE
|
|
#undef RGB_PIXELSIZE
|
|
#undef rgb_ycc_convert_internal
|
|
#undef rgb_gray_convert_internal
|
|
#undef rgb_rgb_convert_internal
|
|
|
|
#define RGB_RED EXT_BGR_RED
|
|
#define RGB_GREEN EXT_BGR_GREEN
|
|
#define RGB_BLUE EXT_BGR_BLUE
|
|
#define RGB_PIXELSIZE EXT_BGR_PIXELSIZE
|
|
#define rgb_ycc_convert_internal extbgr_ycc_convert_internal
|
|
#define rgb_gray_convert_internal extbgr_gray_convert_internal
|
|
#define rgb_rgb_convert_internal extbgr_rgb_convert_internal
|
|
#include "jccolext.c"
|
|
#undef RGB_RED
|
|
#undef RGB_GREEN
|
|
#undef RGB_BLUE
|
|
#undef RGB_PIXELSIZE
|
|
#undef rgb_ycc_convert_internal
|
|
#undef rgb_gray_convert_internal
|
|
#undef rgb_rgb_convert_internal
|
|
|
|
#define RGB_RED EXT_BGRX_RED
|
|
#define RGB_GREEN EXT_BGRX_GREEN
|
|
#define RGB_BLUE EXT_BGRX_BLUE
|
|
#define RGB_PIXELSIZE EXT_BGRX_PIXELSIZE
|
|
#define rgb_ycc_convert_internal extbgrx_ycc_convert_internal
|
|
#define rgb_gray_convert_internal extbgrx_gray_convert_internal
|
|
#define rgb_rgb_convert_internal extbgrx_rgb_convert_internal
|
|
#include "jccolext.c"
|
|
#undef RGB_RED
|
|
#undef RGB_GREEN
|
|
#undef RGB_BLUE
|
|
#undef RGB_PIXELSIZE
|
|
#undef rgb_ycc_convert_internal
|
|
#undef rgb_gray_convert_internal
|
|
#undef rgb_rgb_convert_internal
|
|
|
|
#define RGB_RED EXT_XBGR_RED
|
|
#define RGB_GREEN EXT_XBGR_GREEN
|
|
#define RGB_BLUE EXT_XBGR_BLUE
|
|
#define RGB_PIXELSIZE EXT_XBGR_PIXELSIZE
|
|
#define rgb_ycc_convert_internal extxbgr_ycc_convert_internal
|
|
#define rgb_gray_convert_internal extxbgr_gray_convert_internal
|
|
#define rgb_rgb_convert_internal extxbgr_rgb_convert_internal
|
|
#include "jccolext.c"
|
|
#undef RGB_RED
|
|
#undef RGB_GREEN
|
|
#undef RGB_BLUE
|
|
#undef RGB_PIXELSIZE
|
|
#undef rgb_ycc_convert_internal
|
|
#undef rgb_gray_convert_internal
|
|
#undef rgb_rgb_convert_internal
|
|
|
|
#define RGB_RED EXT_XRGB_RED
|
|
#define RGB_GREEN EXT_XRGB_GREEN
|
|
#define RGB_BLUE EXT_XRGB_BLUE
|
|
#define RGB_PIXELSIZE EXT_XRGB_PIXELSIZE
|
|
#define rgb_ycc_convert_internal extxrgb_ycc_convert_internal
|
|
#define rgb_gray_convert_internal extxrgb_gray_convert_internal
|
|
#define rgb_rgb_convert_internal extxrgb_rgb_convert_internal
|
|
#include "jccolext.c"
|
|
#undef RGB_RED
|
|
#undef RGB_GREEN
|
|
#undef RGB_BLUE
|
|
#undef RGB_PIXELSIZE
|
|
#undef rgb_ycc_convert_internal
|
|
#undef rgb_gray_convert_internal
|
|
#undef rgb_rgb_convert_internal
|
|
|
|
|
|
/*
|
|
* Initialize for RGB->YCC colorspace conversion.
|
|
*/
|
|
|
|
METHODDEF(void)
|
|
rgb_ycc_start(j_compress_ptr cinfo)
|
|
{
|
|
my_cconvert_ptr cconvert = (my_cconvert_ptr)cinfo->cconvert;
|
|
JLONG *rgb_ycc_tab;
|
|
JLONG i;
|
|
|
|
/* Allocate and fill in the conversion tables. */
|
|
cconvert->rgb_ycc_tab = rgb_ycc_tab = (JLONG *)
|
|
(*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
|
|
(TABLE_SIZE * sizeof(JLONG)));
|
|
|
|
for (i = 0; i <= MAXJSAMPLE; i++) {
|
|
rgb_ycc_tab[i + R_Y_OFF] = FIX(0.29900) * i;
|
|
rgb_ycc_tab[i + G_Y_OFF] = FIX(0.58700) * i;
|
|
rgb_ycc_tab[i + B_Y_OFF] = FIX(0.11400) * i + ONE_HALF;
|
|
rgb_ycc_tab[i + R_CB_OFF] = (-FIX(0.16874)) * i;
|
|
rgb_ycc_tab[i + G_CB_OFF] = (-FIX(0.33126)) * i;
|
|
/* We use a rounding fudge-factor of 0.5-epsilon for Cb and Cr.
|
|
* This ensures that the maximum output will round to MAXJSAMPLE
|
|
* not MAXJSAMPLE+1, and thus that we don't have to range-limit.
|
|
*/
|
|
rgb_ycc_tab[i + B_CB_OFF] = FIX(0.50000) * i + CBCR_OFFSET + ONE_HALF - 1;
|
|
/* B=>Cb and R=>Cr tables are the same
|
|
rgb_ycc_tab[i + R_CR_OFF] = FIX(0.50000) * i + CBCR_OFFSET + ONE_HALF - 1;
|
|
*/
|
|
rgb_ycc_tab[i + G_CR_OFF] = (-FIX(0.41869)) * i;
|
|
rgb_ycc_tab[i + B_CR_OFF] = (-FIX(0.08131)) * i;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Convert some rows of samples to the JPEG colorspace.
|
|
*/
|
|
|
|
METHODDEF(void)
|
|
rgb_ycc_convert(j_compress_ptr cinfo, JSAMPARRAY input_buf,
|
|
JSAMPIMAGE output_buf, JDIMENSION output_row, int num_rows)
|
|
{
|
|
switch (cinfo->in_color_space) {
|
|
case JCS_EXT_RGB:
|
|
extrgb_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
|
|
num_rows);
|
|
break;
|
|
case JCS_EXT_RGBX:
|
|
case JCS_EXT_RGBA:
|
|
extrgbx_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
|
|
num_rows);
|
|
break;
|
|
case JCS_EXT_BGR:
|
|
extbgr_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
|
|
num_rows);
|
|
break;
|
|
case JCS_EXT_BGRX:
|
|
case JCS_EXT_BGRA:
|
|
extbgrx_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
|
|
num_rows);
|
|
break;
|
|
case JCS_EXT_XBGR:
|
|
case JCS_EXT_ABGR:
|
|
extxbgr_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
|
|
num_rows);
|
|
break;
|
|
case JCS_EXT_XRGB:
|
|
case JCS_EXT_ARGB:
|
|
extxrgb_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
|
|
num_rows);
|
|
break;
|
|
default:
|
|
rgb_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
|
|
num_rows);
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
/**************** Cases other than RGB -> YCbCr **************/
|
|
|
|
|
|
/*
|
|
* Convert some rows of samples to the JPEG colorspace.
|
|
*/
|
|
|
|
METHODDEF(void)
|
|
rgb_gray_convert(j_compress_ptr cinfo, JSAMPARRAY input_buf,
|
|
JSAMPIMAGE output_buf, JDIMENSION output_row, int num_rows)
|
|
{
|
|
switch (cinfo->in_color_space) {
|
|
case JCS_EXT_RGB:
|
|
extrgb_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
|
|
num_rows);
|
|
break;
|
|
case JCS_EXT_RGBX:
|
|
case JCS_EXT_RGBA:
|
|
extrgbx_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
|
|
num_rows);
|
|
break;
|
|
case JCS_EXT_BGR:
|
|
extbgr_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
|
|
num_rows);
|
|
break;
|
|
case JCS_EXT_BGRX:
|
|
case JCS_EXT_BGRA:
|
|
extbgrx_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
|
|
num_rows);
|
|
break;
|
|
case JCS_EXT_XBGR:
|
|
case JCS_EXT_ABGR:
|
|
extxbgr_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
|
|
num_rows);
|
|
break;
|
|
case JCS_EXT_XRGB:
|
|
case JCS_EXT_ARGB:
|
|
extxrgb_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
|
|
num_rows);
|
|
break;
|
|
default:
|
|
rgb_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
|
|
num_rows);
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Extended RGB to plain RGB conversion
|
|
*/
|
|
|
|
METHODDEF(void)
|
|
rgb_rgb_convert(j_compress_ptr cinfo, JSAMPARRAY input_buf,
|
|
JSAMPIMAGE output_buf, JDIMENSION output_row, int num_rows)
|
|
{
|
|
switch (cinfo->in_color_space) {
|
|
case JCS_EXT_RGB:
|
|
extrgb_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
|
|
num_rows);
|
|
break;
|
|
case JCS_EXT_RGBX:
|
|
case JCS_EXT_RGBA:
|
|
extrgbx_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
|
|
num_rows);
|
|
break;
|
|
case JCS_EXT_BGR:
|
|
extbgr_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
|
|
num_rows);
|
|
break;
|
|
case JCS_EXT_BGRX:
|
|
case JCS_EXT_BGRA:
|
|
extbgrx_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
|
|
num_rows);
|
|
break;
|
|
case JCS_EXT_XBGR:
|
|
case JCS_EXT_ABGR:
|
|
extxbgr_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
|
|
num_rows);
|
|
break;
|
|
case JCS_EXT_XRGB:
|
|
case JCS_EXT_ARGB:
|
|
extxrgb_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
|
|
num_rows);
|
|
break;
|
|
default:
|
|
rgb_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
|
|
num_rows);
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Convert some rows of samples to the JPEG colorspace.
|
|
* This version handles Adobe-style CMYK->YCCK conversion,
|
|
* where we convert R=1-C, G=1-M, and B=1-Y to YCbCr using the same
|
|
* conversion as above, while passing K (black) unchanged.
|
|
* We assume rgb_ycc_start has been called.
|
|
*/
|
|
|
|
METHODDEF(void)
|
|
cmyk_ycck_convert(j_compress_ptr cinfo, JSAMPARRAY input_buf,
|
|
JSAMPIMAGE output_buf, JDIMENSION output_row, int num_rows)
|
|
{
|
|
my_cconvert_ptr cconvert = (my_cconvert_ptr)cinfo->cconvert;
|
|
register int r, g, b;
|
|
register JLONG *ctab = cconvert->rgb_ycc_tab;
|
|
register JSAMPROW inptr;
|
|
register JSAMPROW outptr0, outptr1, outptr2, outptr3;
|
|
register JDIMENSION col;
|
|
JDIMENSION num_cols = cinfo->image_width;
|
|
|
|
while (--num_rows >= 0) {
|
|
inptr = *input_buf++;
|
|
outptr0 = output_buf[0][output_row];
|
|
outptr1 = output_buf[1][output_row];
|
|
outptr2 = output_buf[2][output_row];
|
|
outptr3 = output_buf[3][output_row];
|
|
output_row++;
|
|
for (col = 0; col < num_cols; col++) {
|
|
r = MAXJSAMPLE - inptr[0];
|
|
g = MAXJSAMPLE - inptr[1];
|
|
b = MAXJSAMPLE - inptr[2];
|
|
/* K passes through as-is */
|
|
outptr3[col] = inptr[3];
|
|
inptr += 4;
|
|
/* If the inputs are 0..MAXJSAMPLE, the outputs of these equations
|
|
* must be too; we do not need an explicit range-limiting operation.
|
|
* Hence the value being shifted is never negative, and we don't
|
|
* need the general RIGHT_SHIFT macro.
|
|
*/
|
|
/* Y */
|
|
outptr0[col] = (JSAMPLE)((ctab[r + R_Y_OFF] + ctab[g + G_Y_OFF] +
|
|
ctab[b + B_Y_OFF]) >> SCALEBITS);
|
|
/* Cb */
|
|
outptr1[col] = (JSAMPLE)((ctab[r + R_CB_OFF] + ctab[g + G_CB_OFF] +
|
|
ctab[b + B_CB_OFF]) >> SCALEBITS);
|
|
/* Cr */
|
|
outptr2[col] = (JSAMPLE)((ctab[r + R_CR_OFF] + ctab[g + G_CR_OFF] +
|
|
ctab[b + B_CR_OFF]) >> SCALEBITS);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Convert some rows of samples to the JPEG colorspace.
|
|
* This version handles grayscale output with no conversion.
|
|
* The source can be either plain grayscale or YCbCr (since Y == gray).
|
|
*/
|
|
|
|
METHODDEF(void)
|
|
grayscale_convert(j_compress_ptr cinfo, JSAMPARRAY input_buf,
|
|
JSAMPIMAGE output_buf, JDIMENSION output_row, int num_rows)
|
|
{
|
|
register JSAMPROW inptr;
|
|
register JSAMPROW outptr;
|
|
register JDIMENSION col;
|
|
JDIMENSION num_cols = cinfo->image_width;
|
|
int instride = cinfo->input_components;
|
|
|
|
while (--num_rows >= 0) {
|
|
inptr = *input_buf++;
|
|
outptr = output_buf[0][output_row];
|
|
output_row++;
|
|
for (col = 0; col < num_cols; col++) {
|
|
outptr[col] = inptr[0];
|
|
inptr += instride;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Convert some rows of samples to the JPEG colorspace.
|
|
* This version handles multi-component colorspaces without conversion.
|
|
* We assume input_components == num_components.
|
|
*/
|
|
|
|
METHODDEF(void)
|
|
null_convert(j_compress_ptr cinfo, JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
|
|
JDIMENSION output_row, int num_rows)
|
|
{
|
|
register JSAMPROW inptr;
|
|
register JSAMPROW outptr, outptr0, outptr1, outptr2, outptr3;
|
|
register JDIMENSION col;
|
|
register int ci;
|
|
int nc = cinfo->num_components;
|
|
JDIMENSION num_cols = cinfo->image_width;
|
|
|
|
if (nc == 3) {
|
|
while (--num_rows >= 0) {
|
|
inptr = *input_buf++;
|
|
outptr0 = output_buf[0][output_row];
|
|
outptr1 = output_buf[1][output_row];
|
|
outptr2 = output_buf[2][output_row];
|
|
output_row++;
|
|
for (col = 0; col < num_cols; col++) {
|
|
outptr0[col] = *inptr++;
|
|
outptr1[col] = *inptr++;
|
|
outptr2[col] = *inptr++;
|
|
}
|
|
}
|
|
} else if (nc == 4) {
|
|
while (--num_rows >= 0) {
|
|
inptr = *input_buf++;
|
|
outptr0 = output_buf[0][output_row];
|
|
outptr1 = output_buf[1][output_row];
|
|
outptr2 = output_buf[2][output_row];
|
|
outptr3 = output_buf[3][output_row];
|
|
output_row++;
|
|
for (col = 0; col < num_cols; col++) {
|
|
outptr0[col] = *inptr++;
|
|
outptr1[col] = *inptr++;
|
|
outptr2[col] = *inptr++;
|
|
outptr3[col] = *inptr++;
|
|
}
|
|
}
|
|
} else {
|
|
while (--num_rows >= 0) {
|
|
/* It seems fastest to make a separate pass for each component. */
|
|
for (ci = 0; ci < nc; ci++) {
|
|
inptr = *input_buf;
|
|
outptr = output_buf[ci][output_row];
|
|
for (col = 0; col < num_cols; col++) {
|
|
outptr[col] = inptr[ci];
|
|
inptr += nc;
|
|
}
|
|
}
|
|
input_buf++;
|
|
output_row++;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Empty method for start_pass.
|
|
*/
|
|
|
|
METHODDEF(void)
|
|
null_method(j_compress_ptr cinfo)
|
|
{
|
|
/* no work needed */
|
|
}
|
|
|
|
|
|
/*
|
|
* Module initialization routine for input colorspace conversion.
|
|
*/
|
|
|
|
GLOBAL(void)
|
|
jinit_color_converter(j_compress_ptr cinfo)
|
|
{
|
|
my_cconvert_ptr cconvert;
|
|
|
|
cconvert = (my_cconvert_ptr)
|
|
(*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
|
|
sizeof(my_color_converter));
|
|
cinfo->cconvert = (struct jpeg_color_converter *)cconvert;
|
|
/* set start_pass to null method until we find out differently */
|
|
cconvert->pub.start_pass = null_method;
|
|
|
|
/* Make sure input_components agrees with in_color_space */
|
|
switch (cinfo->in_color_space) {
|
|
case JCS_GRAYSCALE:
|
|
if (cinfo->input_components != 1)
|
|
ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
|
|
break;
|
|
|
|
case JCS_RGB:
|
|
case JCS_EXT_RGB:
|
|
case JCS_EXT_RGBX:
|
|
case JCS_EXT_BGR:
|
|
case JCS_EXT_BGRX:
|
|
case JCS_EXT_XBGR:
|
|
case JCS_EXT_XRGB:
|
|
case JCS_EXT_RGBA:
|
|
case JCS_EXT_BGRA:
|
|
case JCS_EXT_ABGR:
|
|
case JCS_EXT_ARGB:
|
|
if (cinfo->input_components != rgb_pixelsize[cinfo->in_color_space])
|
|
ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
|
|
break;
|
|
|
|
case JCS_YCbCr:
|
|
if (cinfo->input_components != 3)
|
|
ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
|
|
break;
|
|
|
|
case JCS_CMYK:
|
|
case JCS_YCCK:
|
|
if (cinfo->input_components != 4)
|
|
ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
|
|
break;
|
|
|
|
default: /* JCS_UNKNOWN can be anything */
|
|
if (cinfo->input_components < 1)
|
|
ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
|
|
break;
|
|
}
|
|
|
|
/* Check num_components, set conversion method based on requested space */
|
|
switch (cinfo->jpeg_color_space) {
|
|
case JCS_GRAYSCALE:
|
|
if (cinfo->num_components != 1)
|
|
ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
|
|
if (cinfo->in_color_space == JCS_GRAYSCALE)
|
|
cconvert->pub.color_convert = grayscale_convert;
|
|
else if (cinfo->in_color_space == JCS_RGB ||
|
|
cinfo->in_color_space == JCS_EXT_RGB ||
|
|
cinfo->in_color_space == JCS_EXT_RGBX ||
|
|
cinfo->in_color_space == JCS_EXT_BGR ||
|
|
cinfo->in_color_space == JCS_EXT_BGRX ||
|
|
cinfo->in_color_space == JCS_EXT_XBGR ||
|
|
cinfo->in_color_space == JCS_EXT_XRGB ||
|
|
cinfo->in_color_space == JCS_EXT_RGBA ||
|
|
cinfo->in_color_space == JCS_EXT_BGRA ||
|
|
cinfo->in_color_space == JCS_EXT_ABGR ||
|
|
cinfo->in_color_space == JCS_EXT_ARGB) {
|
|
if (jsimd_can_rgb_gray())
|
|
cconvert->pub.color_convert = jsimd_rgb_gray_convert;
|
|
else {
|
|
cconvert->pub.start_pass = rgb_ycc_start;
|
|
cconvert->pub.color_convert = rgb_gray_convert;
|
|
}
|
|
} else if (cinfo->in_color_space == JCS_YCbCr)
|
|
cconvert->pub.color_convert = grayscale_convert;
|
|
else
|
|
ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
|
|
break;
|
|
|
|
case JCS_RGB:
|
|
if (cinfo->num_components != 3)
|
|
ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
|
|
if (rgb_red[cinfo->in_color_space] == 0 &&
|
|
rgb_green[cinfo->in_color_space] == 1 &&
|
|
rgb_blue[cinfo->in_color_space] == 2 &&
|
|
rgb_pixelsize[cinfo->in_color_space] == 3) {
|
|
#if defined(__mips__)
|
|
if (jsimd_c_can_null_convert())
|
|
cconvert->pub.color_convert = jsimd_c_null_convert;
|
|
else
|
|
#endif
|
|
cconvert->pub.color_convert = null_convert;
|
|
} else if (cinfo->in_color_space == JCS_RGB ||
|
|
cinfo->in_color_space == JCS_EXT_RGB ||
|
|
cinfo->in_color_space == JCS_EXT_RGBX ||
|
|
cinfo->in_color_space == JCS_EXT_BGR ||
|
|
cinfo->in_color_space == JCS_EXT_BGRX ||
|
|
cinfo->in_color_space == JCS_EXT_XBGR ||
|
|
cinfo->in_color_space == JCS_EXT_XRGB ||
|
|
cinfo->in_color_space == JCS_EXT_RGBA ||
|
|
cinfo->in_color_space == JCS_EXT_BGRA ||
|
|
cinfo->in_color_space == JCS_EXT_ABGR ||
|
|
cinfo->in_color_space == JCS_EXT_ARGB)
|
|
cconvert->pub.color_convert = rgb_rgb_convert;
|
|
else
|
|
ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
|
|
break;
|
|
|
|
case JCS_YCbCr:
|
|
if (cinfo->num_components != 3)
|
|
ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
|
|
if (cinfo->in_color_space == JCS_RGB ||
|
|
cinfo->in_color_space == JCS_EXT_RGB ||
|
|
cinfo->in_color_space == JCS_EXT_RGBX ||
|
|
cinfo->in_color_space == JCS_EXT_BGR ||
|
|
cinfo->in_color_space == JCS_EXT_BGRX ||
|
|
cinfo->in_color_space == JCS_EXT_XBGR ||
|
|
cinfo->in_color_space == JCS_EXT_XRGB ||
|
|
cinfo->in_color_space == JCS_EXT_RGBA ||
|
|
cinfo->in_color_space == JCS_EXT_BGRA ||
|
|
cinfo->in_color_space == JCS_EXT_ABGR ||
|
|
cinfo->in_color_space == JCS_EXT_ARGB) {
|
|
if (jsimd_can_rgb_ycc())
|
|
cconvert->pub.color_convert = jsimd_rgb_ycc_convert;
|
|
else {
|
|
cconvert->pub.start_pass = rgb_ycc_start;
|
|
cconvert->pub.color_convert = rgb_ycc_convert;
|
|
}
|
|
} else if (cinfo->in_color_space == JCS_YCbCr) {
|
|
#if defined(__mips__)
|
|
if (jsimd_c_can_null_convert())
|
|
cconvert->pub.color_convert = jsimd_c_null_convert;
|
|
else
|
|
#endif
|
|
cconvert->pub.color_convert = null_convert;
|
|
} else
|
|
ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
|
|
break;
|
|
|
|
case JCS_CMYK:
|
|
if (cinfo->num_components != 4)
|
|
ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
|
|
if (cinfo->in_color_space == JCS_CMYK) {
|
|
#if defined(__mips__)
|
|
if (jsimd_c_can_null_convert())
|
|
cconvert->pub.color_convert = jsimd_c_null_convert;
|
|
else
|
|
#endif
|
|
cconvert->pub.color_convert = null_convert;
|
|
} else
|
|
ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
|
|
break;
|
|
|
|
case JCS_YCCK:
|
|
if (cinfo->num_components != 4)
|
|
ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
|
|
if (cinfo->in_color_space == JCS_CMYK) {
|
|
cconvert->pub.start_pass = rgb_ycc_start;
|
|
cconvert->pub.color_convert = cmyk_ycck_convert;
|
|
} else if (cinfo->in_color_space == JCS_YCCK) {
|
|
#if defined(__mips__)
|
|
if (jsimd_c_can_null_convert())
|
|
cconvert->pub.color_convert = jsimd_c_null_convert;
|
|
else
|
|
#endif
|
|
cconvert->pub.color_convert = null_convert;
|
|
} else
|
|
ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
|
|
break;
|
|
|
|
default: /* allow null conversion of JCS_UNKNOWN */
|
|
if (cinfo->jpeg_color_space != cinfo->in_color_space ||
|
|
cinfo->num_components != cinfo->input_components)
|
|
ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
|
|
#if defined(__mips__)
|
|
if (jsimd_c_can_null_convert())
|
|
cconvert->pub.color_convert = jsimd_c_null_convert;
|
|
else
|
|
#endif
|
|
cconvert->pub.color_convert = null_convert;
|
|
break;
|
|
}
|
|
}
|