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414 lines
10 KiB
C
414 lines
10 KiB
C
/*
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* The Python Imaging Library
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* $Id$
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*
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* imaging storage object
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*
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* This baseline implementation is designed to efficiently handle
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* large images, provided they fit into the available memory.
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*
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* history:
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* 1995-06-15 fl Created
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* 1995-09-12 fl Updated API, compiles silently under ANSI C++
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* 1995-11-26 fl Compiles silently under Borland 4.5 as well
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* 1996-05-05 fl Correctly test status from Prologue
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* 1997-05-12 fl Increased THRESHOLD (to speed up Tk interface)
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* 1997-05-30 fl Added support for floating point images
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* 1997-11-17 fl Added support for "RGBX" images
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* 1998-01-11 fl Added support for integer images
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* 1998-03-05 fl Exported Prologue/Epilogue functions
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* 1998-07-01 fl Added basic "YCrCb" support
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* 1998-07-03 fl Attach palette in prologue for "P" images
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* 1998-07-09 hk Don't report MemoryError on zero-size images
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* 1998-07-12 fl Change "YCrCb" to "YCbCr" (!)
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* 1998-10-26 fl Added "I;16" and "I;16B" storage modes (experimental)
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* 1998-12-29 fl Fixed allocation bug caused by previous fix
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* 1999-02-03 fl Added "RGBa" and "BGR" modes (experimental)
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* 2001-04-22 fl Fixed potential memory leak in ImagingCopyInfo
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* 2003-09-26 fl Added "LA" and "PA" modes (experimental)
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* 2005-10-02 fl Added image counter
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*
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* Copyright (c) 1998-2005 by Secret Labs AB
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* Copyright (c) 1995-2005 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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int ImagingNewCount = 0;
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/* --------------------------------------------------------------------
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* Standard image object.
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*/
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Imaging
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ImagingNewPrologueSubtype(const char *mode, unsigned xsize, unsigned ysize,
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int size)
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{
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Imaging im;
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ImagingSectionCookie cookie;
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im = (Imaging) calloc(1, size);
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if (!im)
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return (Imaging) ImagingError_MemoryError();
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/* Setup image descriptor */
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im->xsize = xsize;
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im->ysize = ysize;
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im->type = IMAGING_TYPE_UINT8;
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if (strcmp(mode, "1") == 0) {
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/* 1-bit images */
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im->bands = im->pixelsize = 1;
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im->linesize = xsize;
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} else if (strcmp(mode, "P") == 0) {
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/* 8-bit palette mapped images */
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im->bands = im->pixelsize = 1;
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im->linesize = xsize;
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im->palette = ImagingPaletteNew("RGB");
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} else if (strcmp(mode, "PA") == 0) {
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/* 8-bit palette with alpha */
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im->bands = 2;
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im->pixelsize = 4; /* store in image32 memory */
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im->linesize = xsize * 4;
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im->palette = ImagingPaletteNew("RGB");
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} else if (strcmp(mode, "L") == 0) {
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/* 8-bit greyscale (luminance) images */
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im->bands = im->pixelsize = 1;
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im->linesize = xsize;
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} else if (strcmp(mode, "LA") == 0) {
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/* 8-bit greyscale (luminance) with alpha */
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im->bands = 2;
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im->pixelsize = 4; /* store in image32 memory */
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im->linesize = xsize * 4;
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} else if (strcmp(mode, "F") == 0) {
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/* 32-bit floating point images */
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im->bands = 1;
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im->pixelsize = 4;
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im->linesize = xsize * 4;
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im->type = IMAGING_TYPE_FLOAT32;
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} else if (strcmp(mode, "I") == 0) {
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/* 32-bit integer images */
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im->bands = 1;
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im->pixelsize = 4;
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im->linesize = xsize * 4;
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im->type = IMAGING_TYPE_INT32;
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} else if (strcmp(mode, "I;16") == 0 || strcmp(mode, "I;16L") == 0 || strcmp(mode, "I;16B") == 0) {
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/* EXPERIMENTAL */
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/* 16-bit raw integer images */
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im->bands = 1;
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im->pixelsize = 2;
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im->linesize = xsize * 2;
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im->type = IMAGING_TYPE_SPECIAL;
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} else if (strcmp(mode, "RGB") == 0) {
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/* 24-bit true colour images */
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im->bands = 3;
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im->pixelsize = 4;
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im->linesize = xsize * 4;
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} else if (strcmp(mode, "BGR;15") == 0) {
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/* EXPERIMENTAL */
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/* 15-bit true colour */
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im->bands = 1;
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im->pixelsize = 2;
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im->linesize = (xsize*2 + 3) & -4;
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im->type = IMAGING_TYPE_SPECIAL;
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} else if (strcmp(mode, "BGR;16") == 0) {
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/* EXPERIMENTAL */
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/* 16-bit reversed true colour */
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im->bands = 1;
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im->pixelsize = 2;
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im->linesize = (xsize*2 + 3) & -4;
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im->type = IMAGING_TYPE_SPECIAL;
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} else if (strcmp(mode, "BGR;24") == 0) {
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/* EXPERIMENTAL */
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/* 24-bit reversed true colour */
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im->bands = 1;
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im->pixelsize = 3;
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im->linesize = (xsize*3 + 3) & -4;
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im->type = IMAGING_TYPE_SPECIAL;
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} else if (strcmp(mode, "BGR;32") == 0) {
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/* EXPERIMENTAL */
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/* 32-bit reversed true colour */
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im->bands = 1;
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im->pixelsize = 4;
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im->linesize = (xsize*4 + 3) & -4;
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im->type = IMAGING_TYPE_SPECIAL;
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} else if (strcmp(mode, "RGBX") == 0) {
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/* 32-bit true colour images with padding */
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im->bands = im->pixelsize = 4;
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im->linesize = xsize * 4;
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} else if (strcmp(mode, "RGBA") == 0) {
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/* 32-bit true colour images with alpha */
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im->bands = im->pixelsize = 4;
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im->linesize = xsize * 4;
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} else if (strcmp(mode, "RGBa") == 0) {
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/* EXPERIMENTAL */
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/* 32-bit true colour images with premultiplied alpha */
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im->bands = im->pixelsize = 4;
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im->linesize = xsize * 4;
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} else if (strcmp(mode, "CMYK") == 0) {
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/* 32-bit colour separation */
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im->bands = im->pixelsize = 4;
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im->linesize = xsize * 4;
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} else if (strcmp(mode, "YCbCr") == 0) {
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/* 24-bit video format */
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im->bands = 3;
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im->pixelsize = 4;
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im->linesize = xsize * 4;
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} else {
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free(im);
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return (Imaging) ImagingError_ValueError("unrecognized mode");
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}
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/* Setup image descriptor */
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strcpy(im->mode, mode);
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ImagingSectionEnter(&cookie);
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/* Pointer array (allocate at least one line, to avoid MemoryError
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exceptions on platforms where calloc(0, x) returns NULL) */
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im->image = (char **) calloc((ysize > 0) ? ysize : 1, sizeof(void *));
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ImagingSectionLeave(&cookie);
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if (!im->image) {
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free(im);
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return (Imaging) ImagingError_MemoryError();
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}
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ImagingNewCount++;
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return im;
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}
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Imaging
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ImagingNewPrologue(const char *mode, unsigned xsize, unsigned ysize)
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{
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return ImagingNewPrologueSubtype(
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mode, xsize, ysize, sizeof(struct ImagingMemoryInstance)
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);
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}
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Imaging
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ImagingNewEpilogue(Imaging im)
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{
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/* If the raster data allocator didn't setup a destructor,
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assume that it couldn't allocate the required amount of
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memory. */
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if (!im->destroy)
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return (Imaging) ImagingError_MemoryError();
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/* Initialize alias pointers to pixel data. */
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switch (im->pixelsize) {
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case 1: case 2: case 3:
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im->image8 = (UINT8 **) im->image;
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break;
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case 4:
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im->image32 = (INT32 **) im->image;
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break;
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}
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return im;
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}
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void
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ImagingDelete(Imaging im)
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{
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if (!im)
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return;
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if (im->palette)
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ImagingPaletteDelete(im->palette);
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if (im->destroy)
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im->destroy(im);
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if (im->image)
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free(im->image);
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free(im);
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}
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/* Array Storage Type */
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/* ------------------ */
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/* Allocate image as an array of line buffers. */
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static void
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ImagingDestroyArray(Imaging im)
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{
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int y;
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if (im->image)
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for (y = 0; y < im->ysize; y++)
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if (im->image[y])
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free(im->image[y]);
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}
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Imaging
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ImagingNewArray(const char *mode, int xsize, int ysize)
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{
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Imaging im;
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ImagingSectionCookie cookie;
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int y;
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char* p;
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im = ImagingNewPrologue(mode, xsize, ysize);
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if (!im)
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return NULL;
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ImagingSectionEnter(&cookie);
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/* Allocate image as an array of lines */
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for (y = 0; y < im->ysize; y++) {
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p = (char *) malloc(im->linesize);
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if (!p) {
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ImagingDestroyArray(im);
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break;
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}
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im->image[y] = p;
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}
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ImagingSectionLeave(&cookie);
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if (y == im->ysize)
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im->destroy = ImagingDestroyArray;
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return ImagingNewEpilogue(im);
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}
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/* Block Storage Type */
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/* ------------------ */
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/* Allocate image as a single block. */
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static void
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ImagingDestroyBlock(Imaging im)
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{
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if (im->block)
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free(im->block);
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}
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Imaging
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ImagingNewBlock(const char *mode, int xsize, int ysize)
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{
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Imaging im;
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int y, i;
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int bytes;
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im = ImagingNewPrologue(mode, xsize, ysize);
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if (!im)
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return NULL;
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/* Use a single block */
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bytes = im->ysize * im->linesize;
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if (bytes <= 0)
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/* some platforms return NULL for malloc(0); this fix
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prevents MemoryError on zero-sized images on such
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platforms */
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bytes = 1;
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im->block = (char *) malloc(bytes);
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if (im->block) {
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for (y = i = 0; y < im->ysize; y++) {
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im->image[y] = im->block + i;
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i += im->linesize;
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}
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im->destroy = ImagingDestroyBlock;
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}
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return ImagingNewEpilogue(im);
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}
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/* --------------------------------------------------------------------
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* Create a new, internally allocated, image.
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*/
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#if defined(IMAGING_SMALL_MODEL)
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#define THRESHOLD 16384L
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#else
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#define THRESHOLD (2048*2048*4L)
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#endif
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Imaging
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ImagingNew(const char* mode, int xsize, int ysize)
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{
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int bytes;
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Imaging im;
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if (strlen(mode) == 1) {
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if (mode[0] == 'F' || mode[0] == 'I')
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bytes = 4;
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else
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bytes = 1;
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} else
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bytes = strlen(mode); /* close enough */
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if ((Py_ssize_t) xsize * ysize * bytes <= THRESHOLD) {
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im = ImagingNewBlock(mode, xsize, ysize);
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if (im)
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return im;
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/* assume memory error; try allocating in array mode instead */
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ImagingError_Clear();
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}
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return ImagingNewArray(mode, xsize, ysize);
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}
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Imaging
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ImagingNew2(const char* mode, Imaging imOut, Imaging imIn)
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{
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/* allocate or validate output image */
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if (imOut) {
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/* make sure images match */
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if (strcmp(imOut->mode, mode) != 0
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|| imOut->xsize != imIn->xsize
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|| imOut->ysize != imIn->ysize) {
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return ImagingError_Mismatch();
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}
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} else {
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/* create new image */
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imOut = ImagingNew(mode, imIn->xsize, imIn->ysize);
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if (!imOut)
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return NULL;
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}
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return imOut;
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}
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void
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ImagingCopyInfo(Imaging destination, Imaging source)
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{
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if (source->palette) {
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if (destination->palette)
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ImagingPaletteDelete(destination->palette);
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destination->palette = ImagingPaletteDuplicate(source->palette);
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}
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}
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