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pjs/jpeg/jdcolor.c

584 строки
27 KiB
C
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/*
* jdcolor.c
*
* Copyright (C) 1991-1997, Thomas G. Lane.
* This file is part of the Independent JPEG Group's software.
* For conditions of distribution and use, see the accompanying README file.
*
* This file contains output colorspace conversion routines.
*/
#define JPEG_INTERNALS
#include "jinclude.h"
#include "jpeglib.h"
#include "jconfig.h"
/* Private subobject */
typedef struct {
struct jpeg_color_deconverter pub; /* public fields */
/* These fields are not needed anymore as these are now static tables */
#if 0
/* Private state for YCC->RGB conversion */
int * Cr_r_tab; /* => table for Cr to R conversion */
int * Cb_b_tab; /* => table for Cb to B conversion */
INT32 * Cr_g_tab; /* => table for Cr to G conversion */
INT32 * Cb_g_tab; /* => table for Cb to G conversion */
#endif
} my_color_deconverter;
typedef my_color_deconverter * my_cconvert_ptr;
/**************** YCbCr -> RGB 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
* R = Y + 1.40200 * Cr
* G = Y - 0.34414 * Cb - 0.71414 * Cr
* B = Y + 1.77200 * Cb
* where Cb and Cr represent the incoming values less CENTERJSAMPLE.
* (These numbers are derived from TIFF 6.0 section 21, dated 3-June-92.)
*
* 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.
* Notice that Y, being an integral input, does not contribute any fraction
* so it need not participate in the rounding.
*
* For even more speed, we avoid doing any multiplications in the inner loop
* by precalculating the constants times Cb and Cr 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 Cr=>R and Cb=>B values can be rounded to integers in advance; the
* values for the G calculation are left scaled up, since we must add them
* together before rounding.
*/
#define SCALEBITS 16 /* speediest right-shift on some machines */
#define ONE_HALF ((INT32) 1 << (SCALEBITS-1))
#define FIX(x) ((INT32) ((x) * (1L<<SCALEBITS) + 0.5))
/* Use static tables for color processing. */
const int Cr_r_tab[(MAXJSAMPLE+1) * SIZEOF(int)] ={
0xffffff4dUL, 0xffffff4eUL, 0xffffff4fUL, 0xffffff51UL, 0xffffff52UL, 0xffffff54UL,
0xffffff55UL, 0xffffff56UL, 0xffffff58UL, 0xffffff59UL, 0xffffff5bUL, 0xffffff5cUL,
0xffffff5dUL, 0xffffff5fUL, 0xffffff60UL, 0xffffff62UL, 0xffffff63UL, 0xffffff64UL,
0xffffff66UL, 0xffffff67UL, 0xffffff69UL, 0xffffff6aUL, 0xffffff6bUL, 0xffffff6dUL,
0xffffff6eUL, 0xffffff70UL, 0xffffff71UL, 0xffffff72UL, 0xffffff74UL, 0xffffff75UL,
0xffffff77UL, 0xffffff78UL, 0xffffff79UL, 0xffffff7bUL, 0xffffff7cUL, 0xffffff7eUL,
0xffffff7fUL, 0xffffff80UL, 0xffffff82UL, 0xffffff83UL, 0xffffff85UL, 0xffffff86UL,
0xffffff87UL, 0xffffff89UL, 0xffffff8aUL, 0xffffff8cUL, 0xffffff8dUL, 0xffffff8eUL,
0xffffff90UL, 0xffffff91UL, 0xffffff93UL, 0xffffff94UL, 0xffffff95UL, 0xffffff97UL,
0xffffff98UL, 0xffffff9aUL, 0xffffff9bUL, 0xffffff9cUL, 0xffffff9eUL, 0xffffff9fUL,
0xffffffa1UL, 0xffffffa2UL, 0xffffffa3UL, 0xffffffa5UL, 0xffffffa6UL, 0xffffffa8UL,
0xffffffa9UL, 0xffffffaaUL, 0xffffffacUL, 0xffffffadUL, 0xffffffafUL, 0xffffffb0UL,
0xffffffb1UL, 0xffffffb3UL, 0xffffffb4UL, 0xffffffb6UL, 0xffffffb7UL, 0xffffffb8UL,
0xffffffbaUL, 0xffffffbbUL, 0xffffffbdUL, 0xffffffbeUL, 0xffffffc0UL, 0xffffffc1UL,
0xffffffc2UL, 0xffffffc4UL, 0xffffffc5UL, 0xffffffc7UL, 0xffffffc8UL, 0xffffffc9UL,
0xffffffcbUL, 0xffffffccUL, 0xffffffceUL, 0xffffffcfUL, 0xffffffd0UL, 0xffffffd2UL,
0xffffffd3UL, 0xffffffd5UL, 0xffffffd6UL, 0xffffffd7UL, 0xffffffd9UL, 0xffffffdaUL,
0xffffffdcUL, 0xffffffddUL, 0xffffffdeUL, 0xffffffe0UL, 0xffffffe1UL, 0xffffffe3UL,
0xffffffe4UL, 0xffffffe5UL, 0xffffffe7UL, 0xffffffe8UL, 0xffffffeaUL, 0xffffffebUL,
0xffffffecUL, 0xffffffeeUL, 0xffffffefUL, 0xfffffff1UL, 0xfffffff2UL, 0xfffffff3UL,
0xfffffff5UL, 0xfffffff6UL, 0xfffffff8UL, 0xfffffff9UL, 0xfffffffaUL, 0xfffffffcUL,
0xfffffffdUL, 0xffffffffUL, 0x00UL, 0x01UL, 0x03UL, 0x04UL,
0x06UL, 0x07UL, 0x08UL, 0x0aUL, 0x0bUL, 0x0dUL,
0x0eUL, 0x0fUL, 0x11UL, 0x12UL, 0x14UL, 0x15UL,
0x16UL, 0x18UL, 0x19UL, 0x1bUL, 0x1cUL, 0x1dUL,
0x1fUL, 0x20UL, 0x22UL, 0x23UL, 0x24UL, 0x26UL,
0x27UL, 0x29UL, 0x2aUL, 0x2bUL, 0x2dUL, 0x2eUL,
0x30UL, 0x31UL, 0x32UL, 0x34UL, 0x35UL, 0x37UL,
0x38UL, 0x39UL, 0x3bUL, 0x3cUL, 0x3eUL, 0x3fUL,
0x40UL, 0x42UL, 0x43UL, 0x45UL, 0x46UL, 0x48UL,
0x49UL, 0x4aUL, 0x4cUL, 0x4dUL, 0x4fUL, 0x50UL,
0x51UL, 0x53UL, 0x54UL, 0x56UL, 0x57UL, 0x58UL,
0x5aUL, 0x5bUL, 0x5dUL, 0x5eUL, 0x5fUL, 0x61UL,
0x62UL, 0x64UL, 0x65UL, 0x66UL, 0x68UL, 0x69UL,
0x6bUL, 0x6cUL, 0x6dUL, 0x6fUL, 0x70UL, 0x72UL,
0x73UL, 0x74UL, 0x76UL, 0x77UL, 0x79UL, 0x7aUL,
0x7bUL, 0x7dUL, 0x7eUL, 0x80UL, 0x81UL, 0x82UL,
0x84UL, 0x85UL, 0x87UL, 0x88UL, 0x89UL, 0x8bUL,
0x8cUL, 0x8eUL, 0x8fUL, 0x90UL, 0x92UL, 0x93UL,
0x95UL, 0x96UL, 0x97UL, 0x99UL, 0x9aUL, 0x9cUL,
0x9dUL, 0x9eUL, 0xa0UL, 0xa1UL, 0xa3UL, 0xa4UL,
0xa5UL, 0xa7UL, 0xa8UL, 0xaaUL, 0xabUL, 0xacUL,
0xaeUL, 0xafUL, 0xb1UL, 0xb2UL
};
const int Cb_b_tab[(MAXJSAMPLE+1) * SIZEOF(int)] ={
0xffffff1dUL, 0xffffff1fUL, 0xffffff21UL, 0xffffff22UL, 0xffffff24UL, 0xffffff26UL,
0xffffff28UL, 0xffffff2aUL, 0xffffff2bUL, 0xffffff2dUL, 0xffffff2fUL, 0xffffff31UL,
0xffffff32UL, 0xffffff34UL, 0xffffff36UL, 0xffffff38UL, 0xffffff3aUL, 0xffffff3bUL,
0xffffff3dUL, 0xffffff3fUL, 0xffffff41UL, 0xffffff42UL, 0xffffff44UL, 0xffffff46UL,
0xffffff48UL, 0xffffff49UL, 0xffffff4bUL, 0xffffff4dUL, 0xffffff4fUL, 0xffffff51UL,
0xffffff52UL, 0xffffff54UL, 0xffffff56UL, 0xffffff58UL, 0xffffff59UL, 0xffffff5bUL,
0xffffff5dUL, 0xffffff5fUL, 0xffffff61UL, 0xffffff62UL, 0xffffff64UL, 0xffffff66UL,
0xffffff68UL, 0xffffff69UL, 0xffffff6bUL, 0xffffff6dUL, 0xffffff6fUL, 0xffffff70UL,
0xffffff72UL, 0xffffff74UL, 0xffffff76UL, 0xffffff78UL, 0xffffff79UL, 0xffffff7bUL,
0xffffff7dUL, 0xffffff7fUL, 0xffffff80UL, 0xffffff82UL, 0xffffff84UL, 0xffffff86UL,
0xffffff88UL, 0xffffff89UL, 0xffffff8bUL, 0xffffff8dUL, 0xffffff8fUL, 0xffffff90UL,
0xffffff92UL, 0xffffff94UL, 0xffffff96UL, 0xffffff97UL, 0xffffff99UL, 0xffffff9bUL,
0xffffff9dUL, 0xffffff9fUL, 0xffffffa0UL, 0xffffffa2UL, 0xffffffa4UL, 0xffffffa6UL,
0xffffffa7UL, 0xffffffa9UL, 0xffffffabUL, 0xffffffadUL, 0xffffffaeUL, 0xffffffb0UL,
0xffffffb2UL, 0xffffffb4UL, 0xffffffb6UL, 0xffffffb7UL, 0xffffffb9UL, 0xffffffbbUL,
0xffffffbdUL, 0xffffffbeUL, 0xffffffc0UL, 0xffffffc2UL, 0xffffffc4UL, 0xffffffc6UL,
0xffffffc7UL, 0xffffffc9UL, 0xffffffcbUL, 0xffffffcdUL, 0xffffffceUL, 0xffffffd0UL,
0xffffffd2UL, 0xffffffd4UL, 0xffffffd5UL, 0xffffffd7UL, 0xffffffd9UL, 0xffffffdbUL,
0xffffffddUL, 0xffffffdeUL, 0xffffffe0UL, 0xffffffe2UL, 0xffffffe4UL, 0xffffffe5UL,
0xffffffe7UL, 0xffffffe9UL, 0xffffffebUL, 0xffffffedUL, 0xffffffeeUL, 0xfffffff0UL,
0xfffffff2UL, 0xfffffff4UL, 0xfffffff5UL, 0xfffffff7UL, 0xfffffff9UL, 0xfffffffbUL,
0xfffffffcUL, 0xfffffffeUL, 0x00UL, 0x02UL, 0x04UL, 0x05UL,
0x07UL, 0x09UL, 0x0bUL, 0x0cUL, 0x0eUL, 0x10UL,
0x12UL, 0x13UL, 0x15UL, 0x17UL, 0x19UL, 0x1bUL,
0x1cUL, 0x1eUL, 0x20UL, 0x22UL, 0x23UL, 0x25UL,
0x27UL, 0x29UL, 0x2bUL, 0x2cUL, 0x2eUL, 0x30UL,
0x32UL, 0x33UL, 0x35UL, 0x37UL, 0x39UL, 0x3aUL,
0x3cUL, 0x3eUL, 0x40UL, 0x42UL, 0x43UL, 0x45UL,
0x47UL, 0x49UL, 0x4aUL, 0x4cUL, 0x4eUL, 0x50UL,
0x52UL, 0x53UL, 0x55UL, 0x57UL, 0x59UL, 0x5aUL,
0x5cUL, 0x5eUL, 0x60UL, 0x61UL, 0x63UL, 0x65UL,
0x67UL, 0x69UL, 0x6aUL, 0x6cUL, 0x6eUL, 0x70UL,
0x71UL, 0x73UL, 0x75UL, 0x77UL, 0x78UL, 0x7aUL,
0x7cUL, 0x7eUL, 0x80UL, 0x81UL, 0x83UL, 0x85UL,
0x87UL, 0x88UL, 0x8aUL, 0x8cUL, 0x8eUL, 0x90UL,
0x91UL, 0x93UL, 0x95UL, 0x97UL, 0x98UL, 0x9aUL,
0x9cUL, 0x9eUL, 0x9fUL, 0xa1UL, 0xa3UL, 0xa5UL,
0xa7UL, 0xa8UL, 0xaaUL, 0xacUL, 0xaeUL, 0xafUL,
0xb1UL, 0xb3UL, 0xb5UL, 0xb7UL, 0xb8UL, 0xbaUL,
0xbcUL, 0xbeUL, 0xbfUL, 0xc1UL, 0xc3UL, 0xc5UL,
0xc6UL, 0xc8UL, 0xcaUL, 0xccUL, 0xceUL, 0xcfUL,
0xd1UL, 0xd3UL, 0xd5UL, 0xd6UL, 0xd8UL, 0xdaUL,
0xdcUL, 0xdeUL, 0xdfUL, 0xe1UL
};
const int Cr_g_tab[(MAXJSAMPLE+1) * SIZEOF(int)] ={
0x5b6900UL, 0x5ab22eUL, 0x59fb5cUL, 0x59448aUL, 0x588db8UL, 0x57d6e6UL,
0x572014UL, 0x566942UL, 0x55b270UL, 0x54fb9eUL, 0x5444ccUL, 0x538dfaUL,
0x52d728UL, 0x522056UL, 0x516984UL, 0x50b2b2UL, 0x4ffbe0UL, 0x4f450eUL,
0x4e8e3cUL, 0x4dd76aUL, 0x4d2098UL, 0x4c69c6UL, 0x4bb2f4UL, 0x4afc22UL,
0x4a4550UL, 0x498e7eUL, 0x48d7acUL, 0x4820daUL, 0x476a08UL, 0x46b336UL,
0x45fc64UL, 0x454592UL, 0x448ec0UL, 0x43d7eeUL, 0x43211cUL, 0x426a4aUL,
0x41b378UL, 0x40fca6UL, 0x4045d4UL, 0x3f8f02UL, 0x3ed830UL, 0x3e215eUL,
0x3d6a8cUL, 0x3cb3baUL, 0x3bfce8UL, 0x3b4616UL, 0x3a8f44UL, 0x39d872UL,
0x3921a0UL, 0x386aceUL, 0x37b3fcUL, 0x36fd2aUL, 0x364658UL, 0x358f86UL,
0x34d8b4UL, 0x3421e2UL, 0x336b10UL, 0x32b43eUL, 0x31fd6cUL, 0x31469aUL,
0x308fc8UL, 0x2fd8f6UL, 0x2f2224UL, 0x2e6b52UL, 0x2db480UL, 0x2cfdaeUL,
0x2c46dcUL, 0x2b900aUL, 0x2ad938UL, 0x2a2266UL, 0x296b94UL, 0x28b4c2UL,
0x27fdf0UL, 0x27471eUL, 0x26904cUL, 0x25d97aUL, 0x2522a8UL, 0x246bd6UL,
0x23b504UL, 0x22fe32UL, 0x224760UL, 0x21908eUL, 0x20d9bcUL, 0x2022eaUL,
0x1f6c18UL, 0x1eb546UL, 0x1dfe74UL, 0x1d47a2UL, 0x1c90d0UL, 0x1bd9feUL,
0x1b232cUL, 0x1a6c5aUL, 0x19b588UL, 0x18feb6UL, 0x1847e4UL, 0x179112UL,
0x16da40UL, 0x16236eUL, 0x156c9cUL, 0x14b5caUL, 0x13fef8UL, 0x134826UL,
0x129154UL, 0x11da82UL, 0x1123b0UL, 0x106cdeUL, 0xfb60cUL, 0xeff3aUL,
0xe4868UL, 0xd9196UL, 0xcdac4UL, 0xc23f2UL, 0xb6d20UL, 0xab64eUL,
0x9ff7cUL, 0x948aaUL, 0x891d8UL, 0x7db06UL, 0x72434UL, 0x66d62UL,
0x5b690UL, 0x4ffbeUL, 0x448ecUL, 0x3921aUL, 0x2db48UL, 0x22476UL,
0x16da4UL, 0xb6d2UL, 0x0UL, 0xffff492eUL, 0xfffe925cUL, 0xfffddb8aUL,
0xfffd24b8UL, 0xfffc6de6UL, 0xfffbb714UL, 0xfffb0042UL, 0xfffa4970UL, 0xfff9929eUL,
0xfff8dbccUL, 0xfff824faUL, 0xfff76e28UL, 0xfff6b756UL, 0xfff60084UL, 0xfff549b2UL,
0xfff492e0UL, 0xfff3dc0eUL, 0xfff3253cUL, 0xfff26e6aUL, 0xfff1b798UL, 0xfff100c6UL,
0xfff049f4UL, 0xffef9322UL, 0xffeedc50UL, 0xffee257eUL, 0xffed6eacUL, 0xffecb7daUL,
0xffec0108UL, 0xffeb4a36UL, 0xffea9364UL, 0xffe9dc92UL, 0xffe925c0UL, 0xffe86eeeUL,
0xffe7b81cUL, 0xffe7014aUL, 0xffe64a78UL, 0xffe593a6UL, 0xffe4dcd4UL, 0xffe42602UL,
0xffe36f30UL, 0xffe2b85eUL, 0xffe2018cUL, 0xffe14abaUL, 0xffe093e8UL, 0xffdfdd16UL,
0xffdf2644UL, 0xffde6f72UL, 0xffddb8a0UL, 0xffdd01ceUL, 0xffdc4afcUL, 0xffdb942aUL,
0xffdadd58UL, 0xffda2686UL, 0xffd96fb4UL, 0xffd8b8e2UL, 0xffd80210UL, 0xffd74b3eUL,
0xffd6946cUL, 0xffd5dd9aUL, 0xffd526c8UL, 0xffd46ff6UL, 0xffd3b924UL, 0xffd30252UL,
0xffd24b80UL, 0xffd194aeUL, 0xffd0dddcUL, 0xffd0270aUL, 0xffcf7038UL, 0xffceb966UL,
0xffce0294UL, 0xffcd4bc2UL, 0xffcc94f0UL, 0xffcbde1eUL, 0xffcb274cUL, 0xffca707aUL,
0xffc9b9a8UL, 0xffc902d6UL, 0xffc84c04UL, 0xffc79532UL, 0xffc6de60UL, 0xffc6278eUL,
0xffc570bcUL, 0xffc4b9eaUL, 0xffc40318UL, 0xffc34c46UL, 0xffc29574UL, 0xffc1dea2UL,
0xffc127d0UL, 0xffc070feUL, 0xffbfba2cUL, 0xffbf035aUL, 0xffbe4c88UL, 0xffbd95b6UL,
0xffbcdee4UL, 0xffbc2812UL, 0xffbb7140UL, 0xffbaba6eUL, 0xffba039cUL, 0xffb94ccaUL,
0xffb895f8UL, 0xffb7df26UL, 0xffb72854UL, 0xffb67182UL, 0xffb5bab0UL, 0xffb503deUL,
0xffb44d0cUL, 0xffb3963aUL, 0xffb2df68UL, 0xffb22896UL, 0xffb171c4UL, 0xffb0baf2UL,
0xffb00420UL, 0xffaf4d4eUL, 0xffae967cUL, 0xffaddfaaUL, 0xffad28d8UL, 0xffac7206UL,
0xffabbb34UL, 0xffab0462UL, 0xffaa4d90UL, 0xffa996beUL, 0xffa8dfecUL, 0xffa8291aUL,
0xffa77248UL, 0xffa6bb76UL, 0xffa604a4UL, 0xffa54dd2UL
};
const int Cb_g_tab[(MAXJSAMPLE+1) * SIZEOF(int)] ={
0x2c8d00UL, 0x2c34e6UL, 0x2bdcccUL, 0x2b84b2UL, 0x2b2c98UL, 0x2ad47eUL,
0x2a7c64UL, 0x2a244aUL, 0x29cc30UL, 0x297416UL, 0x291bfcUL, 0x28c3e2UL,
0x286bc8UL, 0x2813aeUL, 0x27bb94UL, 0x27637aUL, 0x270b60UL, 0x26b346UL,
0x265b2cUL, 0x260312UL, 0x25aaf8UL, 0x2552deUL, 0x24fac4UL, 0x24a2aaUL,
0x244a90UL, 0x23f276UL, 0x239a5cUL, 0x234242UL, 0x22ea28UL, 0x22920eUL,
0x2239f4UL, 0x21e1daUL, 0x2189c0UL, 0x2131a6UL, 0x20d98cUL, 0x208172UL,
0x202958UL, 0x1fd13eUL, 0x1f7924UL, 0x1f210aUL, 0x1ec8f0UL, 0x1e70d6UL,
0x1e18bcUL, 0x1dc0a2UL, 0x1d6888UL, 0x1d106eUL, 0x1cb854UL, 0x1c603aUL,
0x1c0820UL, 0x1bb006UL, 0x1b57ecUL, 0x1affd2UL, 0x1aa7b8UL, 0x1a4f9eUL,
0x19f784UL, 0x199f6aUL, 0x194750UL, 0x18ef36UL, 0x18971cUL, 0x183f02UL,
0x17e6e8UL, 0x178eceUL, 0x1736b4UL, 0x16de9aUL, 0x168680UL, 0x162e66UL,
0x15d64cUL, 0x157e32UL, 0x152618UL, 0x14cdfeUL, 0x1475e4UL, 0x141dcaUL,
0x13c5b0UL, 0x136d96UL, 0x13157cUL, 0x12bd62UL, 0x126548UL, 0x120d2eUL,
0x11b514UL, 0x115cfaUL, 0x1104e0UL, 0x10acc6UL, 0x1054acUL, 0xffc92UL,
0xfa478UL, 0xf4c5eUL, 0xef444UL, 0xe9c2aUL, 0xe4410UL, 0xdebf6UL,
0xd93dcUL, 0xd3bc2UL, 0xce3a8UL, 0xc8b8eUL, 0xc3374UL, 0xbdb5aUL,
0xb8340UL, 0xb2b26UL, 0xad30cUL, 0xa7af2UL, 0xa22d8UL, 0x9cabeUL,
0x972a4UL, 0x91a8aUL, 0x8c270UL, 0x86a56UL, 0x8123cUL, 0x7ba22UL,
0x76208UL, 0x709eeUL, 0x6b1d4UL, 0x659baUL, 0x601a0UL, 0x5a986UL,
0x5516cUL, 0x4f952UL, 0x4a138UL, 0x4491eUL, 0x3f104UL, 0x398eaUL,
0x340d0UL, 0x2e8b6UL, 0x2909cUL, 0x23882UL, 0x1e068UL, 0x1884eUL,
0x13034UL, 0xd81aUL, 0x8000UL, 0x27e6UL, 0xffffcfccUL, 0xffff77b2UL,
0xffff1f98UL, 0xfffec77eUL, 0xfffe6f64UL, 0xfffe174aUL, 0xfffdbf30UL, 0xfffd6716UL,
0xfffd0efcUL, 0xfffcb6e2UL, 0xfffc5ec8UL, 0xfffc06aeUL, 0xfffbae94UL, 0xfffb567aUL,
0xfffafe60UL, 0xfffaa646UL, 0xfffa4e2cUL, 0xfff9f612UL, 0xfff99df8UL, 0xfff945deUL,
0xfff8edc4UL, 0xfff895aaUL, 0xfff83d90UL, 0xfff7e576UL, 0xfff78d5cUL, 0xfff73542UL,
0xfff6dd28UL, 0xfff6850eUL, 0xfff62cf4UL, 0xfff5d4daUL, 0xfff57cc0UL, 0xfff524a6UL,
0xfff4cc8cUL, 0xfff47472UL, 0xfff41c58UL, 0xfff3c43eUL, 0xfff36c24UL, 0xfff3140aUL,
0xfff2bbf0UL, 0xfff263d6UL, 0xfff20bbcUL, 0xfff1b3a2UL, 0xfff15b88UL, 0xfff1036eUL,
0xfff0ab54UL, 0xfff0533aUL, 0xffeffb20UL, 0xffefa306UL, 0xffef4aecUL, 0xffeef2d2UL,
0xffee9ab8UL, 0xffee429eUL, 0xffedea84UL, 0xffed926aUL, 0xffed3a50UL, 0xffece236UL,
0xffec8a1cUL, 0xffec3202UL, 0xffebd9e8UL, 0xffeb81ceUL, 0xffeb29b4UL, 0xffead19aUL,
0xffea7980UL, 0xffea2166UL, 0xffe9c94cUL, 0xffe97132UL, 0xffe91918UL, 0xffe8c0feUL,
0xffe868e4UL, 0xffe810caUL, 0xffe7b8b0UL, 0xffe76096UL, 0xffe7087cUL, 0xffe6b062UL,
0xffe65848UL, 0xffe6002eUL, 0xffe5a814UL, 0xffe54ffaUL, 0xffe4f7e0UL, 0xffe49fc6UL,
0xffe447acUL, 0xffe3ef92UL, 0xffe39778UL, 0xffe33f5eUL, 0xffe2e744UL, 0xffe28f2aUL,
0xffe23710UL, 0xffe1def6UL, 0xffe186dcUL, 0xffe12ec2UL, 0xffe0d6a8UL, 0xffe07e8eUL,
0xffe02674UL, 0xffdfce5aUL, 0xffdf7640UL, 0xffdf1e26UL, 0xffdec60cUL, 0xffde6df2UL,
0xffde15d8UL, 0xffddbdbeUL, 0xffdd65a4UL, 0xffdd0d8aUL, 0xffdcb570UL, 0xffdc5d56UL,
0xffdc053cUL, 0xffdbad22UL, 0xffdb5508UL, 0xffdafceeUL, 0xffdaa4d4UL, 0xffda4cbaUL,
0xffd9f4a0UL, 0xffd99c86UL, 0xffd9446cUL, 0xffd8ec52UL, 0xffd89438UL, 0xffd83c1eUL,
0xffd7e404UL, 0xffd78beaUL, 0xffd733d0UL, 0xffd6dbb6UL, 0xffd6839cUL, 0xffd62b82UL,
0xffd5d368UL, 0xffd57b4eUL, 0xffd52334UL, 0xffd4cb1aUL
};
/*
* Initialize tables for YCC->RGB colorspace conversion.
*/
LOCAL(void)
build_ycc_rgb_table (j_decompress_ptr cinfo)
{
/* The code below was used to generate the static tables above */
#if 0
my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
int i;
INT32 x;
SHIFT_TEMPS
cconvert->Cr_r_tab = (int *)
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
(MAXJSAMPLE+1) * SIZEOF(int));
cconvert->Cb_b_tab = (int *)
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
(MAXJSAMPLE+1) * SIZEOF(int));
cconvert->Cr_g_tab = (INT32 *)
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
(MAXJSAMPLE+1) * SIZEOF(INT32));
cconvert->Cb_g_tab = (INT32 *)
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
(MAXJSAMPLE+1) * SIZEOF(INT32));
for (i = 0, x = -CENTERJSAMPLE; i <= MAXJSAMPLE; i++, x++) {
/* i is the actual input pixel value, in the range 0..MAXJSAMPLE */
/* The Cb or Cr value we are thinking of is x = i - CENTERJSAMPLE */
/* Cr=>R value is nearest int to 1.40200 * x */
cconvert->Cr_r_tab[i] = (int)
RIGHT_SHIFT(FIX(1.40200) * x + ONE_HALF, SCALEBITS);
/* Cb=>B value is nearest int to 1.77200 * x */
cconvert->Cb_b_tab[i] = (int)
RIGHT_SHIFT(FIX(1.77200) * x + ONE_HALF, SCALEBITS);
/* Cr=>G value is scaled-up -0.71414 * x */
cconvert->Cr_g_tab[i] = (- FIX(0.71414)) * x;
/* Cb=>G value is scaled-up -0.34414 * x */
/* We also add in ONE_HALF so that need not do it in inner loop */
cconvert->Cb_g_tab[i] = (- FIX(0.34414)) * x + ONE_HALF;
}
#endif /* 0 */
}
/*
* Convert some rows of samples to the output colorspace.
*
* Note that we change from noninterleaved, one-plane-per-component format
* to interleaved-pixel format. The output buffer is therefore three times
* as wide as the input buffer.
* A starting row offset is provided only for the input buffer. The caller
* can easily adjust the passed output_buf value to accommodate any row
* offset required on that side.
*/
METHODDEF(void)
ycc_rgb_convert (j_decompress_ptr cinfo,
JSAMPIMAGE input_buf, JDIMENSION input_row,
JSAMPARRAY output_buf, int num_rows)
{
my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
register int y, cb, cr;
JSAMPLE * range_limit_y;
JSAMPROW outptr;
JSAMPROW inptr0, inptr1, inptr2;
JDIMENSION col;
JDIMENSION num_cols = cinfo->output_width;
JSAMPLE * range_limit = cinfo->sample_range_limit;
SHIFT_TEMPS
while (--num_rows >= 0) {
inptr0 = input_buf[0][input_row];
inptr1 = input_buf[1][input_row];
inptr2 = input_buf[2][input_row];
input_row++;
outptr = *output_buf++;
for (col = 0; col < num_cols; col++) {
y = GETJSAMPLE(inptr0[col]);
cb = GETJSAMPLE(inptr1[col]);
cr = GETJSAMPLE(inptr2[col]);
range_limit_y = range_limit + y;
/* Range-limiting is essential due to noise introduced by DCT losses. */
outptr[RGB_RED] = range_limit_y[Cr_r_tab[cr]];
outptr[RGB_GREEN] = range_limit_y[
((int) RIGHT_SHIFT(Cb_g_tab[cb] + Cr_g_tab[cr],
SCALEBITS))];
outptr[RGB_BLUE] = range_limit_y[Cb_b_tab[cb]];
outptr += RGB_PIXELSIZE;
}
}
}
/**************** Cases other than YCbCr -> RGB **************/
/*
* Color conversion for no colorspace change: just copy the data,
* converting from separate-planes to interleaved representation.
*/
METHODDEF(void)
null_convert (j_decompress_ptr cinfo,
JSAMPIMAGE input_buf, JDIMENSION input_row,
JSAMPARRAY output_buf, int num_rows)
{
register JSAMPROW inptr, outptr;
register JDIMENSION count;
register int num_components = cinfo->num_components;
JDIMENSION num_cols = cinfo->output_width;
int ci;
while (--num_rows >= 0) {
for (ci = 0; ci < num_components; ci++) {
inptr = input_buf[ci][input_row];
outptr = output_buf[0] + ci;
for (count = num_cols; count > 0; count--) {
*outptr = *inptr++; /* needn't bother with GETJSAMPLE() here */
outptr += num_components;
}
}
input_row++;
output_buf++;
}
}
/*
* Color conversion for grayscale: just copy the data.
* This also works for YCbCr -> grayscale conversion, in which
* we just copy the Y (luminance) component and ignore chrominance.
*/
METHODDEF(void)
grayscale_convert (j_decompress_ptr cinfo,
JSAMPIMAGE input_buf, JDIMENSION input_row,
JSAMPARRAY output_buf, int num_rows)
{
jcopy_sample_rows(input_buf[0], (int) input_row, output_buf, 0,
num_rows, cinfo->output_width);
}
/*
* Convert grayscale to RGB: just duplicate the graylevel three times.
* This is provided to support applications that don't want to cope
* with grayscale as a separate case.
*/
METHODDEF(void)
gray_rgb_convert (j_decompress_ptr cinfo,
JSAMPIMAGE input_buf, JDIMENSION input_row,
JSAMPARRAY output_buf, int num_rows)
{
register JSAMPROW inptr, outptr;
register JDIMENSION col;
JDIMENSION num_cols = cinfo->output_width;
while (--num_rows >= 0) {
inptr = input_buf[0][input_row++];
outptr = *output_buf++;
for (col = 0; col < num_cols; col++) {
/* We can dispense with GETJSAMPLE() here */
outptr[RGB_RED] = outptr[RGB_GREEN] = outptr[RGB_BLUE] = inptr[col];
outptr += RGB_PIXELSIZE;
}
}
}
/*
* Adobe-style YCCK->CMYK conversion.
* We convert YCbCr to R=1-C, G=1-M, and B=1-Y using the same
* conversion as above, while passing K (black) unchanged.
*/
METHODDEF(void)
ycck_cmyk_convert (j_decompress_ptr cinfo,
JSAMPIMAGE input_buf, JDIMENSION input_row,
JSAMPARRAY output_buf, int num_rows)
{
my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
register int y, cb, cr;
register JSAMPROW outptr;
register JSAMPROW inptr0, inptr1, inptr2, inptr3;
register JDIMENSION col;
JDIMENSION num_cols = cinfo->output_width;
/* copy these pointers into registers if possible */
register JSAMPLE * range_limit = cinfo->sample_range_limit;
SHIFT_TEMPS
while (--num_rows >= 0) {
inptr0 = input_buf[0][input_row];
inptr1 = input_buf[1][input_row];
inptr2 = input_buf[2][input_row];
inptr3 = input_buf[3][input_row];
input_row++;
outptr = *output_buf++;
for (col = 0; col < num_cols; col++) {
y = GETJSAMPLE(inptr0[col]);
cb = GETJSAMPLE(inptr1[col]);
cr = GETJSAMPLE(inptr2[col]);
/* Range-limiting is essential due to noise introduced by DCT losses. */
outptr[0] = range_limit[MAXJSAMPLE - (y + Cr_r_tab[cr])]; /* red */
outptr[1] = range_limit[MAXJSAMPLE - (y + /* green */
((int) RIGHT_SHIFT(Cb_g_tab[cb] + Cr_g_tab[cr],
SCALEBITS)))];
outptr[2] = range_limit[MAXJSAMPLE - (y + Cb_b_tab[cb])]; /* blue */
/* K passes through unchanged */
outptr[3] = inptr3[col]; /* don't need GETJSAMPLE here */
outptr += 4;
}
}
}
/*
* Empty method for start_pass.
*/
METHODDEF(void)
start_pass_dcolor (j_decompress_ptr cinfo)
{
/* no work needed */
}
/*
* Module initialization routine for output colorspace conversion.
*/
GLOBAL(void)
jinit_color_deconverter (j_decompress_ptr cinfo)
{
my_cconvert_ptr cconvert;
int ci;
cconvert = (my_cconvert_ptr)
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
SIZEOF(my_color_deconverter));
cinfo->cconvert = (struct jpeg_color_deconverter *) cconvert;
cconvert->pub.start_pass = start_pass_dcolor;
/* Make sure num_components agrees with jpeg_color_space */
switch (cinfo->jpeg_color_space) {
case JCS_GRAYSCALE:
if (cinfo->num_components != 1)
ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
break;
case JCS_RGB:
case JCS_YCbCr:
if (cinfo->num_components != 3)
ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
break;
case JCS_CMYK:
case JCS_YCCK:
if (cinfo->num_components != 4)
ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
break;
default: /* JCS_UNKNOWN can be anything */
if (cinfo->num_components < 1)
ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
break;
}
/* Set out_color_components and conversion method based on requested space.
* Also clear the component_needed flags for any unused components,
* so that earlier pipeline stages can avoid useless computation.
*/
switch (cinfo->out_color_space) {
case JCS_GRAYSCALE:
cinfo->out_color_components = 1;
if (cinfo->jpeg_color_space == JCS_GRAYSCALE ||
cinfo->jpeg_color_space == JCS_YCbCr) {
cconvert->pub.color_convert = grayscale_convert;
/* For color->grayscale conversion, only the Y (0) component is needed */
for (ci = 1; ci < cinfo->num_components; ci++)
cinfo->comp_info[ci].component_needed = FALSE;
} else
ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
break;
case JCS_RGB:
cinfo->out_color_components = RGB_PIXELSIZE;
if (cinfo->jpeg_color_space == JCS_YCbCr) {
cconvert->pub.color_convert = ycc_rgb_convert;
build_ycc_rgb_table(cinfo);
} else if (cinfo->jpeg_color_space == JCS_GRAYSCALE) {
cconvert->pub.color_convert = gray_rgb_convert;
} else if (cinfo->jpeg_color_space == JCS_RGB && RGB_PIXELSIZE == 3) {
cconvert->pub.color_convert = null_convert;
} else
ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
break;
case JCS_CMYK:
cinfo->out_color_components = 4;
if (cinfo->jpeg_color_space == JCS_YCCK) {
cconvert->pub.color_convert = ycck_cmyk_convert;
build_ycc_rgb_table(cinfo);
} else if (cinfo->jpeg_color_space == JCS_CMYK) {
cconvert->pub.color_convert = null_convert;
} else
ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
break;
default:
/* Permit null conversion to same output space */
if (cinfo->out_color_space == cinfo->jpeg_color_space) {
cinfo->out_color_components = cinfo->num_components;
cconvert->pub.color_convert = null_convert;
} else /* unsupported non-null conversion */
ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
break;
}
if (cinfo->quantize_colors)
cinfo->output_components = 1; /* single colormapped output component */
else
cinfo->output_components = cinfo->out_color_components;
}
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