504 lines
13 KiB
C
504 lines
13 KiB
C
/*
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SDL_image: An example image loading library for use with SDL
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Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#if (!defined(__APPLE__) || defined(SDL_IMAGE_USE_COMMON_BACKEND)) || !defined(BMP_USES_IMAGEIO)
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/* This is a BMP image file loading framework
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*
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* ICO/CUR file support is here as well since it uses similar internal
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* representation
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*
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* A good test suite of BMP images is available at:
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* http://entropymine.com/jason/bmpsuite/bmpsuite/html/bmpsuite.html
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*/
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#include "SDL_image.h"
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#ifdef LOAD_BMP
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/* See if an image is contained in a data source */
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int IMG_isBMP(SDL_RWops *src)
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{
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Sint64 start;
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int is_BMP;
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char magic[2];
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if ( !src )
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return 0;
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start = SDL_RWtell(src);
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is_BMP = 0;
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if ( SDL_RWread(src, magic, sizeof(magic), 1) ) {
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if ( SDL_strncmp(magic, "BM", 2) == 0 ) {
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is_BMP = 1;
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}
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}
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SDL_RWseek(src, start, RW_SEEK_SET);
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return(is_BMP);
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}
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static int IMG_isICOCUR(SDL_RWops *src, int type)
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{
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Sint64 start;
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int is_ICOCUR;
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/* The Win32 ICO file header (14 bytes) */
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Uint16 bfReserved;
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Uint16 bfType;
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Uint16 bfCount;
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if ( !src )
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return 0;
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start = SDL_RWtell(src);
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is_ICOCUR = 0;
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bfReserved = SDL_ReadLE16(src);
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bfType = SDL_ReadLE16(src);
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bfCount = SDL_ReadLE16(src);
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if ((bfReserved == 0) && (bfType == type) && (bfCount != 0))
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is_ICOCUR = 1;
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SDL_RWseek(src, start, RW_SEEK_SET);
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return (is_ICOCUR);
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}
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int IMG_isICO(SDL_RWops *src)
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{
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return IMG_isICOCUR(src, 1);
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}
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int IMG_isCUR(SDL_RWops *src)
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{
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return IMG_isICOCUR(src, 2);
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}
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#include "SDL_error.h"
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#include "SDL_video.h"
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#include "SDL_endian.h"
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/* Compression encodings for BMP files */
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#ifndef BI_RGB
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#define BI_RGB 0
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#define BI_RLE8 1
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#define BI_RLE4 2
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#define BI_BITFIELDS 3
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#endif
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static SDL_Surface *LoadBMP_RW (SDL_RWops *src, int freesrc)
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{
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return SDL_LoadBMP_RW(src, freesrc);
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}
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static Uint8
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SDL_Read8(SDL_RWops * src)
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{
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Uint8 value;
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SDL_RWread(src, &value, 1, 1);
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return (value);
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}
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static SDL_Surface *
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LoadICOCUR_RW(SDL_RWops * src, int type, int freesrc)
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{
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SDL_bool was_error;
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Sint64 fp_offset = 0;
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int bmpPitch;
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int i,j, pad;
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SDL_Surface *surface;
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/*
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Uint32 Rmask;
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Uint32 Gmask;
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Uint32 Bmask;
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*/
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Uint8 *bits;
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int ExpandBMP;
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int maxCol = 0;
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int icoOfs = 0;
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Uint32 palette[256];
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/* The Win32 ICO file header (14 bytes) */
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Uint16 bfReserved;
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Uint16 bfType;
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Uint16 bfCount;
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/* The Win32 BITMAPINFOHEADER struct (40 bytes) */
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Uint32 biSize;
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Sint32 biWidth;
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Sint32 biHeight;
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/* Uint16 biPlanes; */
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Uint16 biBitCount;
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Uint32 biCompression;
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/*
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Uint32 biSizeImage;
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Sint32 biXPelsPerMeter;
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Sint32 biYPelsPerMeter;
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Uint32 biClrImportant;
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*/
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Uint32 biClrUsed;
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/* Make sure we are passed a valid data source */
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surface = NULL;
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was_error = SDL_FALSE;
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if (src == NULL) {
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was_error = SDL_TRUE;
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goto done;
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}
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/* Read in the ICO file header */
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fp_offset = SDL_RWtell(src);
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SDL_ClearError();
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bfReserved = SDL_ReadLE16(src);
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bfType = SDL_ReadLE16(src);
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bfCount = SDL_ReadLE16(src);
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if ((bfReserved != 0) || (bfType != type) || (bfCount == 0)) {
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IMG_SetError("File is not a Windows %s file", type == 1 ? "ICO" : "CUR");
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was_error = SDL_TRUE;
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goto done;
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}
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/* Read the Win32 Icon Directory */
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for (i = 0; i < bfCount; i++) {
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/* Icon Directory Entries */
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int bWidth = SDL_Read8(src); /* Uint8, but 0 = 256 ! */
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int bHeight = SDL_Read8(src); /* Uint8, but 0 = 256 ! */
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int bColorCount = SDL_Read8(src); /* Uint8, but 0 = 256 ! */
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/*
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Uint8 bReserved;
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Uint16 wPlanes;
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Uint16 wBitCount;
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Uint32 dwBytesInRes;
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*/
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Uint32 dwImageOffset;
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/* bReserved = */ SDL_Read8(src);
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/* wPlanes = */ SDL_ReadLE16(src);
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/* wBitCount = */ SDL_ReadLE16(src);
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/* dwBytesInRes = */ SDL_ReadLE32(src);
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dwImageOffset = SDL_ReadLE32(src);
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if (!bWidth)
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bWidth = 256;
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if (!bHeight)
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bHeight = 256;
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if (!bColorCount)
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bColorCount = 256;
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//printf("%dx%d@%d - %08x\n", bWidth, bHeight, bColorCount, dwImageOffset);
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if (bColorCount > maxCol) {
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maxCol = bColorCount;
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icoOfs = dwImageOffset;
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//printf("marked\n");
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}
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}
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/* Advance to the DIB Data */
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if (SDL_RWseek(src, icoOfs, RW_SEEK_SET) < 0) {
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SDL_Error(SDL_EFSEEK);
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was_error = SDL_TRUE;
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goto done;
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}
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/* Read the Win32 BITMAPINFOHEADER */
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biSize = SDL_ReadLE32(src);
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if (biSize == 40) {
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biWidth = SDL_ReadLE32(src);
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biHeight = SDL_ReadLE32(src);
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/* biPlanes = */ SDL_ReadLE16(src);
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biBitCount = SDL_ReadLE16(src);
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biCompression = SDL_ReadLE32(src);
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/* biSizeImage = */ SDL_ReadLE32(src);
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/* biXPelsPerMeter = */ SDL_ReadLE32(src);
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/* biYPelsPerMeter = */ SDL_ReadLE32(src);
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biClrUsed = SDL_ReadLE32(src);
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/* biClrImportant = */ SDL_ReadLE32(src);
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} else {
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IMG_SetError("Unsupported ICO bitmap format");
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was_error = SDL_TRUE;
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goto done;
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}
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/* Check for read error */
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if (SDL_strcmp(SDL_GetError(), "") != 0) {
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was_error = SDL_TRUE;
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goto done;
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}
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/* We don't support any BMP compression right now */
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switch (biCompression) {
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case BI_RGB:
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/* Default values for the BMP format */
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switch (biBitCount) {
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case 1:
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case 4:
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ExpandBMP = biBitCount;
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biBitCount = 8;
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break;
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case 8:
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ExpandBMP = 8;
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break;
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case 24:
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ExpandBMP = 24;
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break;
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case 32:
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/*
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Rmask = 0x00FF0000;
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Gmask = 0x0000FF00;
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Bmask = 0x000000FF;
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*/
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ExpandBMP = 0;
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break;
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default:
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IMG_SetError("ICO file with unsupported bit count");
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was_error = SDL_TRUE;
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goto done;
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}
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break;
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default:
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IMG_SetError("Compressed ICO files not supported");
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was_error = SDL_TRUE;
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goto done;
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}
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/* sanity check image size, so we don't overflow integers, etc. */
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if ((biWidth < 0) || (biWidth > 0xFFFFFF) ||
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(biHeight < 0) || (biHeight > 0xFFFFFF)) {
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IMG_SetError("Unsupported or invalid ICO dimensions");
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was_error = SDL_TRUE;
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goto done;
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}
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/* Create a RGBA surface */
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biHeight = biHeight >> 1;
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//printf("%d x %d\n", biWidth, biHeight);
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surface =
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SDL_CreateRGBSurface(0, biWidth, biHeight, 32, 0x00FF0000,
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0x0000FF00, 0x000000FF, 0xFF000000);
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if (surface == NULL) {
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was_error = SDL_TRUE;
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goto done;
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}
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/* Load the palette, if any */
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//printf("bc %d bused %d\n", biBitCount, biClrUsed);
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if (biBitCount <= 8) {
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if (biClrUsed == 0) {
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biClrUsed = 1 << biBitCount;
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}
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if (biClrUsed > SDL_arraysize(palette)) {
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IMG_SetError("Unsupported or incorrect biClrUsed field");
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was_error = SDL_TRUE;
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goto done;
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}
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for (i = 0; i < (int) biClrUsed; ++i) {
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SDL_RWread(src, &palette[i], 4, 1);
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}
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}
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/* Read the surface pixels. Note that the bmp image is upside down */
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bits = (Uint8 *) surface->pixels + (surface->h * surface->pitch);
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switch (ExpandBMP) {
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case 1:
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bmpPitch = (biWidth + 7) >> 3;
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pad = (((bmpPitch) % 4) ? (4 - ((bmpPitch) % 4)) : 0);
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break;
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case 4:
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bmpPitch = (biWidth + 1) >> 1;
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pad = (((bmpPitch) % 4) ? (4 - ((bmpPitch) % 4)) : 0);
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break;
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case 8:
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bmpPitch = biWidth;
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pad = (((bmpPitch) % 4) ? (4 - ((bmpPitch) % 4)) : 0);
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break;
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case 24:
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bmpPitch = biWidth * 3;
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pad = (((bmpPitch) % 4) ? (4 - ((bmpPitch) % 4)) : 0);
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break;
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default:
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bmpPitch = biWidth * 4;
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pad = 0;
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break;
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}
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while (bits > (Uint8 *) surface->pixels) {
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bits -= surface->pitch;
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switch (ExpandBMP) {
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case 1:
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case 4:
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case 8:
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{
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Uint8 pixel = 0;
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int shift = (8 - ExpandBMP);
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for (i = 0; i < surface->w; ++i) {
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if (i % (8 / ExpandBMP) == 0) {
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if (!SDL_RWread(src, &pixel, 1, 1)) {
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IMG_SetError("Error reading from ICO");
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was_error = SDL_TRUE;
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goto done;
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}
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}
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*((Uint32 *) bits + i) = (palette[pixel >> shift]);
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pixel <<= ExpandBMP;
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}
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}
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break;
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case 24:
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{
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Uint32 pixel;
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Uint8 channel;
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for (i = 0; i < surface->w; ++i) {
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pixel = 0;
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for (j = 0; j < 3; ++j) {
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/* Load each color channel into pixel */
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if (!SDL_RWread(src, &channel, 1, 1)) {
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IMG_SetError("Error reading from ICO");
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was_error = SDL_TRUE;
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goto done;
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}
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pixel |= (channel << (j * 8));
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}
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*((Uint32 *) bits + i) = pixel;
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}
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}
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break;
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default:
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if (SDL_RWread(src, bits, 1, surface->pitch)
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!= surface->pitch) {
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SDL_Error(SDL_EFREAD);
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was_error = SDL_TRUE;
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goto done;
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}
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break;
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}
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/* Skip padding bytes, ugh */
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if (pad) {
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Uint8 padbyte;
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for (i = 0; i < pad; ++i) {
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SDL_RWread(src, &padbyte, 1, 1);
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}
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}
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}
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/* Read the mask pixels. Note that the bmp image is upside down */
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bits = (Uint8 *) surface->pixels + (surface->h * surface->pitch);
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ExpandBMP = 1;
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bmpPitch = (biWidth + 7) >> 3;
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pad = (((bmpPitch) % 4) ? (4 - ((bmpPitch) % 4)) : 0);
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while (bits > (Uint8 *) surface->pixels) {
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Uint8 pixel = 0;
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int shift = (8 - ExpandBMP);
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bits -= surface->pitch;
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for (i = 0; i < surface->w; ++i) {
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if (i % (8 / ExpandBMP) == 0) {
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if (!SDL_RWread(src, &pixel, 1, 1)) {
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IMG_SetError("Error reading from ICO");
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was_error = SDL_TRUE;
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goto done;
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}
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}
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*((Uint32 *) bits + i) |= ((pixel >> shift) ? 0 : 0xFF000000);
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pixel <<= ExpandBMP;
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}
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/* Skip padding bytes, ugh */
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if (pad) {
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Uint8 padbyte;
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for (i = 0; i < pad; ++i) {
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SDL_RWread(src, &padbyte, 1, 1);
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}
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}
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}
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done:
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if (was_error) {
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if (src) {
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SDL_RWseek(src, fp_offset, RW_SEEK_SET);
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}
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if (surface) {
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SDL_FreeSurface(surface);
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}
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surface = NULL;
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}
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if (freesrc && src) {
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SDL_RWclose(src);
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}
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return (surface);
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}
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/* Load a BMP type image from an SDL datasource */
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SDL_Surface *IMG_LoadBMP_RW(SDL_RWops *src)
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{
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return(LoadBMP_RW(src, 0));
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}
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/* Load a ICO type image from an SDL datasource */
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SDL_Surface *IMG_LoadICO_RW(SDL_RWops *src)
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{
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return(LoadICOCUR_RW(src, 1, 0));
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}
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/* Load a CUR type image from an SDL datasource */
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SDL_Surface *IMG_LoadCUR_RW(SDL_RWops *src)
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{
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return(LoadICOCUR_RW(src, 2, 0));
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}
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#else
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#if _MSC_VER >= 1300
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#pragma warning(disable : 4100) /* warning C4100: 'op' : unreferenced formal parameter */
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#endif
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/* See if an image is contained in a data source */
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int IMG_isBMP(SDL_RWops *src)
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{
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return(0);
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}
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int IMG_isICO(SDL_RWops *src)
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{
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return(0);
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}
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int IMG_isCUR(SDL_RWops *src)
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{
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return(0);
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}
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/* Load a BMP type image from an SDL datasource */
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SDL_Surface *IMG_LoadBMP_RW(SDL_RWops *src)
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{
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return(NULL);
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}
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/* Load a BMP type image from an SDL datasource */
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SDL_Surface *IMG_LoadCUR_RW(SDL_RWops *src)
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{
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return(NULL);
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}
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/* Load a BMP type image from an SDL datasource */
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SDL_Surface *IMG_LoadICO_RW(SDL_RWops *src)
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{
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return(NULL);
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}
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#endif /* LOAD_BMP */
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#endif /* !defined(__APPLE__) || defined(SDL_IMAGE_USE_COMMON_BACKEND) */
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