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Pillow/libImaging/Pack.c
Andrew Murray 572a3d970c Removed whitespace from blank lines
2016-09-03 12:23:42 +10:00

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/*
* The Python Imaging Library.
* $Id$
*
* code to pack raw data
*
* history:
* 1996-04-30 fl Created
* 1996-05-12 fl Published a few RGB packers
* 1996-11-01 fl More RGB packers (Tk booster stuff)
* 1996-12-30 fl Added P;1, P;2 and P;4 packers
* 1997-06-02 fl Added F (F;32NF) packer
* 1997-08-28 fl Added 1 as L packer
* 1998-02-08 fl Added I packer
* 1998-03-09 fl Added mode field, RGBA/RGBX as RGB packers
* 1998-07-01 fl Added YCbCr support
* 1998-07-12 fl Added I 16 packer
* 1999-02-03 fl Added BGR packers
* 2003-09-26 fl Added LA/PA packers
* 2006-06-22 fl Added CMYK;I packer
*
* Copyright (c) 1997-2006 by Secret Labs AB.
* Copyright (c) 1996-1997 by Fredrik Lundh.
*
* See the README file for information on usage and redistribution.
*/
#include "Imaging.h"
#define R 0
#define G 1
#define B 2
#define X 3
#define A 3
#define C 0
#define M 1
#define Y 2
#define K 3
/* byte swapping macros */
#define C16N\
(out[0]=tmp[0], out[1]=tmp[1]);
#define C16S\
(out[1]=tmp[0], out[0]=tmp[1]);
#define C32N\
(out[0]=tmp[0], out[1]=tmp[1], out[2]=tmp[2], out[3]=tmp[3]);
#define C32S\
(out[3]=tmp[0], out[2]=tmp[1], out[1]=tmp[2], out[0]=tmp[3]);
#define C64N\
(out[0]=tmp[0], out[1]=tmp[1], out[2]=tmp[2], out[3]=tmp[3],\
out[4]=tmp[4], out[5]=tmp[5], out[6]=tmp[6], out[7]=tmp[7]);
#define C64S\
(out[7]=tmp[0], out[6]=tmp[1], out[5]=tmp[2], out[4]=tmp[3],\
out[3]=tmp[4], out[2]=tmp[5], out[1]=tmp[6], out[0]=tmp[7]);
#ifdef WORDS_BIGENDIAN
#define C16B C16N
#define C16L C16S
#define C32B C32N
#define C32L C32S
#define C64B C64N
#define C64L C64S
#else
#define C16B C16S
#define C16L C16N
#define C32B C32S
#define C32L C32N
#define C64B C64S
#define C64L C64N
#endif
/* like (a * b + 127) / 255), but much faster on most platforms */
#define MULDIV255(a, b, tmp)\
(tmp = (a) * (b) + 128, ((((tmp) >> 8) + (tmp)) >> 8))
static void
pack1(UINT8* out, const UINT8* in, int pixels)
{
int i, m, b;
/* bilevel (black is 0) */
b = 0; m = 128;
for (i = 0; i < pixels; i++) {
if (in[i] != 0)
b |= m;
m >>= 1;
if (m == 0) {
*out++ = b;
b = 0; m = 128;
}
}
if (m != 128)
*out++ = b;
}
static void
pack1I(UINT8* out, const UINT8* in, int pixels)
{
int i, m, b;
/* bilevel (black is 1) */
b = 0; m = 128;
for (i = 0; i < pixels; i++) {
if (in[i] == 0)
b |= m;
m >>= 1;
if (m == 0) {
*out++ = b;
b = 0; m = 128;
}
}
if (m != 128)
*out++ = b;
}
static void
pack1R(UINT8* out, const UINT8* in, int pixels)
{
int i, m, b;
/* bilevel, lsb first (black is 0) */
b = 0; m = 1;
for (i = 0; i < pixels; i++) {
if (in[i] != 0)
b |= m;
m <<= 1;
if (m == 256){
*out++ = b;
b = 0; m = 1;
}
}
if (m != 1)
*out++ = b;
}
static void
pack1IR(UINT8* out, const UINT8* in, int pixels)
{
int i, m, b;
/* bilevel, lsb first (black is 1) */
b = 0; m = 1;
for (i = 0; i < pixels; i++) {
if (in[i] == 0)
b |= m;
m <<= 1;
if (m == 256){
*out++ = b;
b = 0; m = 1;
}
}
if (m != 1)
*out++ = b;
}
static void
pack1L(UINT8* out, const UINT8* in, int pixels)
{
int i;
/* bilevel, stored as bytes */
for (i = 0; i < pixels; i++)
out[i] = (in[i] != 0) ? 255 : 0;
}
static void
packP4(UINT8* out, const UINT8* in, int pixels)
{
while (pixels >= 2) {
*out++ = (in[0] << 4) |
(in[1] & 15);
in += 2; pixels -= 2;
}
if (pixels)
out[0] = (in[0] << 4);
}
static void
packP2(UINT8* out, const UINT8* in, int pixels)
{
while (pixels >= 4) {
*out++ = (in[0] << 6) |
((in[1] & 3) << 4) |
((in[2] & 3) << 2) |
(in[3] & 3);
in += 4; pixels -= 4;
}
switch (pixels) {
case 3:
out[0] = (in[0] << 6) |
((in[1] & 3) << 4) |
((in[2] & 3) << 2);
break;
case 2:
out[0] = (in[0] << 6) |
((in[1] & 3) << 4);
case 1:
out[0] = (in[0] << 6);
}
}
static void
packLA(UINT8* out, const UINT8* in, int pixels)
{
int i;
/* LA, pixel interleaved */
for (i = 0; i < pixels; i++) {
out[0] = in[R];
out[1] = in[A];
out += 2; in += 4;
}
}
static void
packLAL(UINT8* out, const UINT8* in, int pixels)
{
int i;
/* LA, line interleaved */
for (i = 0; i < pixels; i++) {
out[i] = in[R];
out[i+pixels] = in[A];
in += 4;
}
}
void
ImagingPackRGB(UINT8* out, const UINT8* in, int pixels)
{
int i;
/* RGB triplets */
for (i = 0; i < pixels; i++) {
out[0] = in[R];
out[1] = in[G];
out[2] = in[B];
out += 3; in += 4;
}
}
void
ImagingPackXRGB(UINT8* out, const UINT8* in, int pixels)
{
int i;
/* XRGB, triplets with left padding */
for (i = 0; i < pixels; i++) {
out[0] = 0;
out[1] = in[R];
out[2] = in[G];
out[3] = in[B];
out += 4; in += 4;
}
}
void
ImagingPackBGR(UINT8* out, const UINT8* in, int pixels)
{
int i;
/* RGB, reversed bytes */
for (i = 0; i < pixels; i++) {
out[0] = in[B];
out[1] = in[G];
out[2] = in[R];
out += 3; in += 4;
}
}
void
ImagingPackBGRX(UINT8* out, const UINT8* in, int pixels)
{
int i;
/* BGRX, reversed bytes with right padding */
for (i = 0; i < pixels; i++) {
out[0] = in[B];
out[1] = in[G];
out[2] = in[R];
out[3] = 0;
out += 4; in += 4;
}
}
void
ImagingPackXBGR(UINT8* out, const UINT8* in, int pixels)
{
int i;
/* XBGR, reversed bytes with left padding */
for (i = 0; i < pixels; i++) {
out[0] = 0;
out[1] = in[B];
out[2] = in[G];
out[3] = in[R];
out += 4; in += 4;
}
}
void
ImagingPackBGRA(UINT8* out, const UINT8* in, int pixels)
{
int i;
/* BGRX, reversed bytes with right padding */
for (i = 0; i < pixels; i++) {
out[0] = in[B];
out[1] = in[G];
out[2] = in[R];
out[3] = in[A];
out += 4; in += 4;
}
}
void
ImagingPackABGR(UINT8* out, const UINT8* in, int pixels)
{
int i;
/* XBGR, reversed bytes with left padding */
for (i = 0; i < pixels; i++) {
out[0] = in[A];
out[1] = in[B];
out[2] = in[G];
out[3] = in[R];
out += 4; in += 4;
}
}
void
ImagingPackBGRa(UINT8* out, const UINT8* in, int pixels)
{
int i;
/* BGRa, reversed bytes with premultiplied alpha */
for (i = 0; i < pixels; i++) {
int alpha = out[3] = in[A];
int tmp;
out[0] = MULDIV255(in[B], alpha, tmp);
out[1] = MULDIV255(in[G], alpha, tmp);
out[2] = MULDIV255(in[R], alpha, tmp);
out += 4; in += 4;
}
}
static void
packRGBL(UINT8* out, const UINT8* in, int pixels)
{
int i;
/* RGB, line interleaved */
for (i = 0; i < pixels; i++) {
out[i] = in[R];
out[i+pixels] = in[G];
out[i+pixels+pixels] = in[B];
in += 4;
}
}
static void
packRGBXL(UINT8* out, const UINT8* in, int pixels)
{
int i;
/* RGBX, line interleaved */
for (i = 0; i < pixels; i++) {
out[i] = in[R];
out[i+pixels] = in[G];
out[i+pixels+pixels] = in[B];
out[i+pixels+pixels+pixels] = in[X];
in += 4;
}
}
static void
packI16B(UINT8* out, const UINT8* in_, int pixels)
{
int i;
INT32* in = (INT32*) in_;
UINT16 tmp_;
UINT8* tmp = (UINT8*) &tmp_;
for (i = 0; i < pixels; i++) {
if (in[0] <= 0)
tmp_ = 0;
else if (in[0] > 65535)
tmp_ = 65535;
else
tmp_ = in[0];
C16B;
out += 2; in++;
}
}
static void
packI16N_I16B(UINT8* out, const UINT8* in, int pixels){
int i;
UINT8* tmp = (UINT8*) in;
for (i = 0; i < pixels; i++) {
C16B;
out += 2; tmp += 2;
}
}
static void
packI16N_I16(UINT8* out, const UINT8* in, int pixels){
int i;
UINT8* tmp = (UINT8*) in;
for (i = 0; i < pixels; i++) {
C16L;
out += 2; tmp += 2;
}
}
static void
packI32S(UINT8* out, const UINT8* in, int pixels)
{
int i;
UINT8* tmp = (UINT8*) in;
for (i = 0; i < pixels; i++) {
C32L;
out += 4; tmp += 4;
}
}
void
ImagingPackLAB(UINT8* out, const UINT8* in, int pixels)
{
int i;
/* LAB triplets */
for (i = 0; i < pixels; i++) {
out[0] = in[0];
out[1] = in[1] ^ 128; /* signed in outside world */
out[2] = in[2] ^ 128;
out += 3; in += 4;
}
}
static void
copy1(UINT8* out, const UINT8* in, int pixels)
{
/* L, P */
memcpy(out, in, pixels);
}
static void
copy2(UINT8* out, const UINT8* in, int pixels)
{
/* I;16, etc */
memcpy(out, in, pixels*2);
}
static void
copy3(UINT8* out, const UINT8* in, int pixels)
{
/* BGR;24, etc */
memcpy(out, in, pixels*3);
}
static void
copy4(UINT8* out, const UINT8* in, int pixels)
{
/* RGBA, CMYK quadruples */
memcpy(out, in, 4*pixels);
}
static void
copy4I(UINT8* out, const UINT8* in, int pixels)
{
/* RGBA, CMYK quadruples, inverted */
int i;
for (i = 0; i < pixels*4; i++)
out[i] = ~in[i];
}
static void
band0(UINT8* out, const UINT8* in, int pixels)
{
int i;
for (i = 0; i < pixels; i++, in += 4)
out[i] = in[0];
}
static void
band1(UINT8* out, const UINT8* in, int pixels)
{
int i;
for (i = 0; i < pixels; i++, in += 4)
out[i] = in[1];
}
static void
band2(UINT8* out, const UINT8* in, int pixels)
{
int i;
for (i = 0; i < pixels; i++, in += 4)
out[i] = in[2];
}
static void
band3(UINT8* out, const UINT8* in, int pixels)
{
int i;
for (i = 0; i < pixels; i++, in += 4)
out[i] = in[3];
}
static struct {
const char* mode;
const char* rawmode;
int bits;
ImagingShuffler pack;
} packers[] = {
/* bilevel */
{"1", "1", 1, pack1},
{"1", "1;I", 1, pack1I},
{"1", "1;R", 1, pack1R},
{"1", "1;IR", 1, pack1IR},
{"1", "L", 8, pack1L},
/* greyscale */
{"L", "L", 8, copy1},
/* greyscale w. alpha */
{"LA", "LA", 16, packLA},
{"LA", "LA;L", 16, packLAL},
/* palette */
{"P", "P;1", 1, pack1},
{"P", "P;2", 2, packP2},
{"P", "P;4", 4, packP4},
{"P", "P", 8, copy1},
/* palette w. alpha */
{"PA", "PA", 16, packLA},
{"PA", "PA;L", 16, packLAL},
/* true colour */
{"RGB", "RGB", 24, ImagingPackRGB},
{"RGB", "RGBX", 32, copy4},
{"RGB", "XRGB", 32, ImagingPackXRGB},
{"RGB", "BGR", 24, ImagingPackBGR},
{"RGB", "BGRX", 32, ImagingPackBGRX},
{"RGB", "XBGR", 32, ImagingPackXBGR},
{"RGB", "RGB;L", 24, packRGBL},
{"RGB", "R", 8, band0},
{"RGB", "G", 8, band1},
{"RGB", "B", 8, band2},
/* true colour w. alpha */
{"RGBA", "RGBA", 32, copy4},
{"RGBA", "RGBA;L", 32, packRGBXL},
{"RGBA", "RGB", 24, ImagingPackRGB},
{"RGBA", "BGR", 24, ImagingPackBGR},
{"RGBA", "BGRA", 32, ImagingPackBGRA},
{"RGBA", "ABGR", 32, ImagingPackABGR},
{"RGBA", "BGRa", 32, ImagingPackBGRa},
{"RGBA", "R", 8, band0},
{"RGBA", "G", 8, band1},
{"RGBA", "B", 8, band2},
{"RGBA", "A", 8, band3},
/* true colour w. alpha premultiplied */
{"RGBa", "RGBa", 32, copy4},
{"RGBa", "BGRa", 32, ImagingPackBGRA},
{"RGBa", "aBGR", 32, ImagingPackABGR},
/* true colour w. padding */
{"RGBX", "RGBX", 32, copy4},
{"RGBX", "RGBX;L", 32, packRGBXL},
{"RGBX", "RGB", 32, ImagingPackRGB},
{"RGBX", "BGR", 32, ImagingPackBGR},
{"RGBX", "BGRX", 32, ImagingPackBGRX},
{"RGBX", "XBGR", 32, ImagingPackXBGR},
{"RGBX", "R", 8, band0},
{"RGBX", "G", 8, band1},
{"RGBX", "B", 8, band2},
{"RGBX", "X", 8, band3},
/* colour separation */
{"CMYK", "CMYK", 32, copy4},
{"CMYK", "CMYK;I", 32, copy4I},
{"CMYK", "CMYK;L", 32, packRGBXL},
{"CMYK", "C", 8, band0},
{"CMYK", "M", 8, band1},
{"CMYK", "Y", 8, band2},
{"CMYK", "K", 8, band3},
/* video (YCbCr) */
{"YCbCr", "YCbCr", 24, ImagingPackRGB},
{"YCbCr", "YCbCr;L", 24, packRGBL},
{"YCbCr", "YCbCrX", 32, copy4},
{"YCbCr", "YCbCrK", 32, copy4},
{"YCbCr", "Y", 8, band0},
{"YCbCr", "Cb", 8, band1},
{"YCbCr", "Cr", 8, band2},
/* LAB Color */
{"LAB", "LAB", 24, ImagingPackLAB},
{"LAB", "L", 8, band0},
{"LAB", "A", 8, band1},
{"LAB", "B", 8, band2},
/* HSV */
{"HSV", "HSV", 24, ImagingPackRGB},
{"HSV", "H", 8, band0},
{"HSV", "S", 8, band1},
{"HSV", "V", 8, band2},
/* integer */
{"I", "I", 32, copy4},
{"I", "I;16B", 16, packI16B},
{"I", "I;32S", 32, packI32S},
{"I", "I;32NS", 32, copy4},
/* floating point */
{"F", "F", 32, copy4},
{"F", "F;32F", 32, packI32S},
{"F", "F;32NF", 32, copy4},
/* storage modes */
{"I;16", "I;16", 16, copy2},
{"I;16B", "I;16B", 16, copy2},
{"I;16L", "I;16L", 16, copy2},
{"I;16", "I;16N", 16, packI16N_I16}, // LibTiff native->image endian.
{"I;16L", "I;16N", 16, packI16N_I16},
{"I;16B", "I;16N", 16, packI16N_I16B},
{"BGR;15", "BGR;15", 16, copy2},
{"BGR;16", "BGR;16", 16, copy2},
{"BGR;24", "BGR;24", 24, copy3},
{NULL} /* sentinel */
};
ImagingShuffler
ImagingFindPacker(const char* mode, const char* rawmode, int* bits_out)
{
int i;
/* find a suitable pixel packer */
for (i = 0; packers[i].rawmode; i++)
if (strcmp(packers[i].mode, mode) == 0 &&
strcmp(packers[i].rawmode, rawmode) == 0) {
if (bits_out)
*bits_out = packers[i].bits;
return packers[i].pack;
}
return NULL;
}
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