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