src/video/SDL_bmp.c
author Sam Lantinga
Wed, 01 Feb 2006 06:32:25 +0000
changeset 1312 c9b51268668f
parent 1012 f14e3059e138
child 1329 bc67bbf87818
permissions -rw-r--r--
Updated copyright information and removed rcs id lines (problematic in branch merges)
I batch edited these files, so please let me know if I've accidentally removed anybody's
credit here.
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2006 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#ifndef DISABLE_FILE
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/* 
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   Code to load and save surfaces in Windows BMP format.
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   Why support BMP format?  Well, it's a native format for Windows, and
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   most image processing programs can read and write it.  It would be nice
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   to be able to have at least one image format that we can natively load
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   and save, and since PNG is so complex that it would bloat the library,
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   BMP is a good alternative. 
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   This code currently supports Win32 DIBs in uncompressed 8 and 24 bpp.
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*/
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#include <string.h>
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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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SDL_Surface * SDL_LoadBMP_RW (SDL_RWops *src, int freesrc)
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{
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	int was_error;
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	long fp_offset;
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	int bmpPitch;
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	int i, pad;
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	SDL_Surface *surface;
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	Uint32 Rmask;
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	Uint32 Gmask;
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	Uint32 Bmask;
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	SDL_Palette *palette;
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	Uint8 *bits;
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	int ExpandBMP;
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	/* The Win32 BMP file header (14 bytes) */
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	char   magic[2];
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	Uint32 bfSize;
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	Uint16 bfReserved1;
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	Uint16 bfReserved2;
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	Uint32 bfOffBits;
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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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	Uint32 biSizeImage;
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	Sint32 biXPelsPerMeter;
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	Sint32 biYPelsPerMeter;
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	Uint32 biClrUsed;
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	Uint32 biClrImportant;
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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 = 0;
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	if ( src == NULL ) {
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		was_error = 1;
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		goto done;
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	}
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	/* Read in the BMP file header */
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	fp_offset = SDL_RWtell(src);
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	SDL_ClearError();
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	if ( SDL_RWread(src, magic, 1, 2) != 2 ) {
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		SDL_Error(SDL_EFREAD);
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		was_error = 1;
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		goto done;
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	}
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	if ( strncmp(magic, "BM", 2) != 0 ) {
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		SDL_SetError("File is not a Windows BMP file");
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		was_error = 1;
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		goto done;
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	}
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	bfSize		= SDL_ReadLE32(src);
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	bfReserved1	= SDL_ReadLE16(src);
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	bfReserved2	= SDL_ReadLE16(src);
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	bfOffBits	= SDL_ReadLE32(src);
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	/* Read the Win32 BITMAPINFOHEADER */
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	biSize		= SDL_ReadLE32(src);
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	if ( biSize == 12 ) {
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		biWidth		= (Uint32)SDL_ReadLE16(src);
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		biHeight	= (Uint32)SDL_ReadLE16(src);
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		biPlanes	= SDL_ReadLE16(src);
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		biBitCount	= SDL_ReadLE16(src);
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		biCompression	= BI_RGB;
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		biSizeImage	= 0;
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		biXPelsPerMeter	= 0;
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		biYPelsPerMeter	= 0;
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		biClrUsed	= 0;
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		biClrImportant	= 0;
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	} else {
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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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	}
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	/* Check for read error */
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	if ( strcmp(SDL_GetError(), "") != 0 ) {
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		was_error = 1;
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		goto done;
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	}
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	/* Expand 1 and 4 bit bitmaps to 8 bits per pixel */
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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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		default:
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			ExpandBMP = 0;
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			break;
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	}
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	/* We don't support any BMP compression right now */
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	Rmask = Gmask = Bmask = 0;
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	switch (biCompression) {
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		case BI_RGB:
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			/* If there are no masks, use the defaults */
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			if ( bfOffBits == (14+biSize) ) {
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				/* Default values for the BMP format */
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				switch (biBitCount) {
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					case 15:
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					case 16:
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						Rmask = 0x7C00;
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						Gmask = 0x03E0;
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						Bmask = 0x001F;
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						break;
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					case 24:
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#if SDL_BYTEORDER == SDL_BIG_ENDIAN
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					        Rmask = 0x000000FF;
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					        Gmask = 0x0000FF00;
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					        Bmask = 0x00FF0000;
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						break;
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#endif
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					case 32:
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						Rmask = 0x00FF0000;
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						Gmask = 0x0000FF00;
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						Bmask = 0x000000FF;
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						break;
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					default:
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						break;
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				}
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				break;
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			}
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			/* Fall through -- read the RGB masks */
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		case BI_BITFIELDS:
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			switch (biBitCount) {
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				case 15:
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				case 16:
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				case 32:
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					Rmask = SDL_ReadLE32(src);
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					Gmask = SDL_ReadLE32(src);
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					Bmask = SDL_ReadLE32(src);
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					break;
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				default:
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					break;
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			}
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			break;
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		default:
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			SDL_SetError("Compressed BMP files not supported");
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			was_error = 1;
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			goto done;
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	}
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	/* Create a compatible surface, note that the colors are RGB ordered */
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	surface = SDL_CreateRGBSurface(SDL_SWSURFACE,
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			biWidth, biHeight, biBitCount, Rmask, Gmask, Bmask, 0);
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	if ( surface == NULL ) {
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		was_error = 1;
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		goto done;
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	}
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	/* Load the palette, if any */
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	palette = (surface->format)->palette;
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	if ( palette ) {
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		if ( biClrUsed == 0 ) {
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			biClrUsed = 1 << biBitCount;
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		}
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		if ( biSize == 12 ) {
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			for ( i = 0; i < (int)biClrUsed; ++i ) {
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				SDL_RWread(src, &palette->colors[i].b, 1, 1);
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				SDL_RWread(src, &palette->colors[i].g, 1, 1);
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				SDL_RWread(src, &palette->colors[i].r, 1, 1);
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				palette->colors[i].unused = 0;
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			}	
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		} else {
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			for ( i = 0; i < (int)biClrUsed; ++i ) {
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				SDL_RWread(src, &palette->colors[i].b, 1, 1);
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				SDL_RWread(src, &palette->colors[i].g, 1, 1);
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				SDL_RWread(src, &palette->colors[i].r, 1, 1);
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				SDL_RWread(src, &palette->colors[i].unused, 1, 1);
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			}	
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		}
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		palette->ncolors = biClrUsed;
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	}
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	/* Read the surface pixels.  Note that the bmp image is upside down */
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	if ( SDL_RWseek(src, fp_offset+bfOffBits, SEEK_SET) < 0 ) {
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		SDL_Error(SDL_EFSEEK);
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		was_error = 1;
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		goto done;
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	}
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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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   256
		default:
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   257
			pad  = ((surface->pitch%4) ?
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					(4-(surface->pitch%4)) : 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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   263
		switch (ExpandBMP) {
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   264
			case 1:
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   265
			case 4: {
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   266
			Uint8 pixel = 0;
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   267
			int   shift = (8-ExpandBMP);
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   268
			for ( i=0; i<surface->w; ++i ) {
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   269
				if ( i%(8/ExpandBMP) == 0 ) {
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   270
					if ( !SDL_RWread(src, &pixel, 1, 1) ) {
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   271
						SDL_SetError(
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					"Error reading from BMP");
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   273
						was_error = 1;
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   274
						goto done;
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					}
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   276
				}
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   277
				*(bits+i) = (pixel>>shift);
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				pixel <<= ExpandBMP;
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			} }
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   280
			break;
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   281
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   282
			default:
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   283
			if ( SDL_RWread(src, bits, 1, surface->pitch)
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   284
							 != surface->pitch ) {
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   285
				SDL_Error(SDL_EFREAD);
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   286
				was_error = 1;
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   287
				goto done;
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   288
			}
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   289
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
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   290
			/* Byte-swap the pixels if needed. Note that the 24bpp
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   291
			   case has already been taken care of above. */
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   292
			switch(biBitCount) {
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   293
				case 15:
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   294
				case 16: {
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   295
				        Uint16 *pix = (Uint16 *)bits;
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   296
					for(i = 0; i < surface->w; i++)
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   297
					        pix[i] = SDL_Swap16(pix[i]);
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   298
					break;
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   299
				}
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   300
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   301
				case 32: {
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   302
				        Uint32 *pix = (Uint32 *)bits;
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   303
					for(i = 0; i < surface->w; i++)
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   304
					        pix[i] = SDL_Swap32(pix[i]);
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   305
					break;
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   306
				}
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   307
			}
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   308
#endif
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   309
			break;
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   310
		}
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   311
		/* Skip padding bytes, ugh */
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   312
		if ( pad ) {
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   313
			Uint8 padbyte;
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   314
			for ( i=0; i<pad; ++i ) {
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   315
				SDL_RWread(src, &padbyte, 1, 1);
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   316
			}
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   317
		}
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   318
	}
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   319
done:
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   320
	if ( was_error ) {
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   321
		if ( surface ) {
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   322
			SDL_FreeSurface(surface);
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   323
		}
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   324
		surface = NULL;
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   325
	}
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   326
	if ( freesrc && src ) {
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   327
		SDL_RWclose(src);
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   328
	}
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   329
	return(surface);
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   330
}
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   331
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   332
int SDL_SaveBMP_RW (SDL_Surface *saveme, SDL_RWops *dst, int freedst)
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   333
{
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   334
	long fp_offset;
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   335
	int i, pad;
slouken@0
   336
	SDL_Surface *surface;
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   337
	Uint8 *bits;
slouken@0
   338
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   339
	/* The Win32 BMP file header (14 bytes) */
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   340
	char   magic[2] = { 'B', 'M' };
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   341
	Uint32 bfSize;
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   342
	Uint16 bfReserved1;
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   343
	Uint16 bfReserved2;
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   344
	Uint32 bfOffBits;
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   345
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   346
	/* The Win32 BITMAPINFOHEADER struct (40 bytes) */
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   347
	Uint32 biSize;
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   348
	Sint32 biWidth;
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   349
	Sint32 biHeight;
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   350
	Uint16 biPlanes;
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   351
	Uint16 biBitCount;
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   352
	Uint32 biCompression;
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   353
	Uint32 biSizeImage;
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   354
	Sint32 biXPelsPerMeter;
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   355
	Sint32 biYPelsPerMeter;
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   356
	Uint32 biClrUsed;
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   357
	Uint32 biClrImportant;
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   358
slouken@0
   359
	/* Make sure we have somewhere to save */
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   360
	surface = NULL;
slouken@0
   361
	if ( dst ) {
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   362
		if ( saveme->format->palette ) {
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   363
			if ( saveme->format->BitsPerPixel == 8 ) {
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   364
				surface = saveme;
slouken@0
   365
			} else {
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   366
				SDL_SetError("%d bpp BMP files not supported",
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   367
						saveme->format->BitsPerPixel);
slouken@0
   368
			}
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   369
		}
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   370
		else if ( (saveme->format->BitsPerPixel == 24) &&
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   371
#if SDL_BYTEORDER == SDL_LIL_ENDIAN
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   372
				(saveme->format->Rmask == 0x00FF0000) &&
slouken@0
   373
				(saveme->format->Gmask == 0x0000FF00) &&
slouken@0
   374
				(saveme->format->Bmask == 0x000000FF)
slouken@0
   375
#else
slouken@0
   376
				(saveme->format->Rmask == 0x000000FF) &&
slouken@0
   377
				(saveme->format->Gmask == 0x0000FF00) &&
slouken@0
   378
				(saveme->format->Bmask == 0x00FF0000)
slouken@0
   379
#endif
slouken@0
   380
			  ) {
slouken@0
   381
			surface = saveme;
slouken@0
   382
		} else {
slouken@0
   383
			SDL_Rect bounds;
slouken@0
   384
slouken@0
   385
			/* Convert to 24 bits per pixel */
slouken@0
   386
			surface = SDL_CreateRGBSurface(SDL_SWSURFACE,
slouken@0
   387
					saveme->w, saveme->h, 24,
slouken@0
   388
#if SDL_BYTEORDER == SDL_LIL_ENDIAN
slouken@0
   389
					0x00FF0000, 0x0000FF00, 0x000000FF,
slouken@0
   390
#else
slouken@0
   391
					0x000000FF, 0x0000FF00, 0x00FF0000,
slouken@0
   392
#endif
slouken@0
   393
					0);
slouken@0
   394
			if ( surface != NULL ) {
slouken@0
   395
				bounds.x = 0;
slouken@0
   396
				bounds.y = 0;
slouken@0
   397
				bounds.w = saveme->w;
slouken@0
   398
				bounds.h = saveme->h;
slouken@0
   399
				if ( SDL_LowerBlit(saveme, &bounds, surface,
slouken@0
   400
							&bounds) < 0 ) {
slouken@0
   401
					SDL_FreeSurface(surface);
slouken@0
   402
					SDL_SetError(
slouken@0
   403
					"Couldn't convert image to 24 bpp");
slouken@0
   404
					surface = NULL;
slouken@0
   405
				}
slouken@0
   406
			}
slouken@0
   407
		}
slouken@0
   408
	}
slouken@0
   409
slouken@0
   410
	if ( surface && (SDL_LockSurface(surface) == 0) ) {
slouken@1012
   411
		const int bw = surface->w*surface->format->BytesPerPixel;
slouken@1012
   412
slouken@0
   413
		/* Set the BMP file header values */
slouken@0
   414
		bfSize = 0;		 /* We'll write this when we're done */
slouken@0
   415
		bfReserved1 = 0;
slouken@0
   416
		bfReserved2 = 0;
slouken@0
   417
		bfOffBits = 0;		/* We'll write this when we're done */
slouken@0
   418
slouken@0
   419
		/* Write the BMP file header values */
slouken@0
   420
		fp_offset = SDL_RWtell(dst);
slouken@0
   421
		SDL_ClearError();
slouken@0
   422
		SDL_RWwrite(dst, magic, 2, 1);
slouken@0
   423
		SDL_WriteLE32(dst, bfSize);
slouken@0
   424
		SDL_WriteLE16(dst, bfReserved1);
slouken@0
   425
		SDL_WriteLE16(dst, bfReserved2);
slouken@0
   426
		SDL_WriteLE32(dst, bfOffBits);
slouken@0
   427
slouken@0
   428
		/* Set the BMP info values */
slouken@0
   429
		biSize = 40;
slouken@0
   430
		biWidth = surface->w;
slouken@0
   431
		biHeight = surface->h;
slouken@0
   432
		biPlanes = 1;
slouken@0
   433
		biBitCount = surface->format->BitsPerPixel;
slouken@0
   434
		biCompression = BI_RGB;
slouken@0
   435
		biSizeImage = surface->h*surface->pitch;
slouken@0
   436
		biXPelsPerMeter = 0;
slouken@0
   437
		biYPelsPerMeter = 0;
slouken@0
   438
		if ( surface->format->palette ) {
slouken@0
   439
			biClrUsed = surface->format->palette->ncolors;
slouken@0
   440
		} else {
slouken@0
   441
			biClrUsed = 0;
slouken@0
   442
		}
slouken@0
   443
		biClrImportant = 0;
slouken@0
   444
slouken@0
   445
		/* Write the BMP info values */
slouken@0
   446
		SDL_WriteLE32(dst, biSize);
slouken@0
   447
		SDL_WriteLE32(dst, biWidth);
slouken@0
   448
		SDL_WriteLE32(dst, biHeight);
slouken@0
   449
		SDL_WriteLE16(dst, biPlanes);
slouken@0
   450
		SDL_WriteLE16(dst, biBitCount);
slouken@0
   451
		SDL_WriteLE32(dst, biCompression);
slouken@0
   452
		SDL_WriteLE32(dst, biSizeImage);
slouken@0
   453
		SDL_WriteLE32(dst, biXPelsPerMeter);
slouken@0
   454
		SDL_WriteLE32(dst, biYPelsPerMeter);
slouken@0
   455
		SDL_WriteLE32(dst, biClrUsed);
slouken@0
   456
		SDL_WriteLE32(dst, biClrImportant);
slouken@0
   457
slouken@0
   458
		/* Write the palette (in BGR color order) */
slouken@0
   459
		if ( surface->format->palette ) {
slouken@0
   460
			SDL_Color *colors;
slouken@0
   461
			int       ncolors;
slouken@0
   462
slouken@0
   463
			colors = surface->format->palette->colors;
slouken@0
   464
			ncolors = surface->format->palette->ncolors;
slouken@0
   465
			for ( i=0; i<ncolors; ++i ) {
slouken@0
   466
				SDL_RWwrite(dst, &colors[i].b, 1, 1);
slouken@0
   467
				SDL_RWwrite(dst, &colors[i].g, 1, 1);
slouken@0
   468
				SDL_RWwrite(dst, &colors[i].r, 1, 1);
slouken@0
   469
				SDL_RWwrite(dst, &colors[i].unused, 1, 1);
slouken@0
   470
			}
slouken@0
   471
		}
slouken@0
   472
slouken@0
   473
		/* Write the bitmap offset */
slouken@0
   474
		bfOffBits = SDL_RWtell(dst)-fp_offset;
slouken@0
   475
		if ( SDL_RWseek(dst, fp_offset+10, SEEK_SET) < 0 ) {
slouken@0
   476
			SDL_Error(SDL_EFSEEK);
slouken@0
   477
		}
slouken@0
   478
		SDL_WriteLE32(dst, bfOffBits);
slouken@0
   479
		if ( SDL_RWseek(dst, fp_offset+bfOffBits, SEEK_SET) < 0 ) {
slouken@0
   480
			SDL_Error(SDL_EFSEEK);
slouken@0
   481
		}
slouken@0
   482
slouken@0
   483
		/* Write the bitmap image upside down */
slouken@0
   484
		bits = (Uint8 *)surface->pixels+(surface->h*surface->pitch);
slouken@1012
   485
		pad  = ((bw%4) ? (4-(bw%4)) : 0);
slouken@0
   486
		while ( bits > (Uint8 *)surface->pixels ) {
slouken@0
   487
			bits -= surface->pitch;
slouken@1012
   488
			if ( SDL_RWwrite(dst, bits, 1, bw) != bw) {
slouken@0
   489
				SDL_Error(SDL_EFWRITE);
slouken@0
   490
				break;
slouken@0
   491
			}
slouken@0
   492
			if ( pad ) {
slouken@0
   493
				const Uint8 padbyte = 0;
slouken@0
   494
				for ( i=0; i<pad; ++i ) {
slouken@0
   495
					SDL_RWwrite(dst, &padbyte, 1, 1);
slouken@0
   496
				}
slouken@0
   497
			}
slouken@0
   498
		}
slouken@0
   499
slouken@0
   500
		/* Write the BMP file size */
slouken@0
   501
		bfSize = SDL_RWtell(dst)-fp_offset;
slouken@0
   502
		if ( SDL_RWseek(dst, fp_offset+2, SEEK_SET) < 0 ) {
slouken@0
   503
			SDL_Error(SDL_EFSEEK);
slouken@0
   504
		}
slouken@0
   505
		SDL_WriteLE32(dst, bfSize);
slouken@0
   506
		if ( SDL_RWseek(dst, fp_offset+bfSize, SEEK_SET) < 0 ) {
slouken@0
   507
			SDL_Error(SDL_EFSEEK);
slouken@0
   508
		}
slouken@0
   509
slouken@0
   510
		/* Close it up.. */
slouken@0
   511
		SDL_UnlockSurface(surface);
slouken@0
   512
		if ( surface != saveme ) {
slouken@0
   513
			SDL_FreeSurface(surface);
slouken@0
   514
		}
slouken@0
   515
	}
slouken@0
   516
slouken@0
   517
	if ( freedst && dst ) {
slouken@0
   518
		SDL_RWclose(dst);
slouken@0
   519
	}
slouken@0
   520
	return((strcmp(SDL_GetError(), "") == 0) ? 0 : -1);
slouken@0
   521
}
slouken@0
   522
slouken@0
   523
#endif /* ENABLE_FILE */