IMG_tif.c
author Sam Lantinga <slouken@libsdl.org>
Tue, 10 Nov 2009 06:00:59 +0000
changeset 237 d1a4fae44bd0
parent 236 cce1251de477
child 280 ec4ae96c100c
permissions -rw-r--r--
In the process of tracking down bug #868, made ImageIO the default for building using command line tools, and cleaned up the ImageIO image loading code.
     1 /*
     2     SDL_image:  An example image loading library for use with SDL
     3     Copyright (C) 1997-2009 Sam Lantinga
     4 
     5     This library is free software; you can redistribute it and/or
     6     modify it under the terms of the GNU Lesser General Public
     7     License as published by the Free Software Foundation; either
     8     version 2.1 of the License, or (at your option) any later version.
     9 
    10     This library is distributed in the hope that it will be useful,
    11     but WITHOUT ANY WARRANTY; without even the implied warranty of
    12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    13     Lesser General Public License for more details.
    14 
    15     You should have received a copy of the GNU Lesser General Public
    16     License along with this library; if not, write to the Free Software
    17     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
    18 
    19     Sam Lantinga
    20     slouken@libsdl.org
    21 */
    22 
    23 #if !defined(__APPLE__) || defined(SDL_IMAGE_USE_COMMON_BACKEND)
    24 
    25 /* This is a TIFF image file loading framework */
    26 
    27 #include <stdio.h>
    28 
    29 #include "SDL_image.h"
    30 
    31 #ifdef LOAD_TIF
    32 
    33 #include <tiffio.h>
    34 
    35 static struct {
    36 	int loaded;
    37 	void *handle;
    38 	TIFF* (*TIFFClientOpen)(const char*, const char*, thandle_t, TIFFReadWriteProc, TIFFReadWriteProc, TIFFSeekProc, TIFFCloseProc, TIFFSizeProc, TIFFMapFileProc, TIFFUnmapFileProc);
    39 	void (*TIFFClose)(TIFF*);
    40 	int (*TIFFGetField)(TIFF*, ttag_t, ...);
    41 	int (*TIFFReadRGBAImage)(TIFF*, uint32, uint32, uint32*, int);
    42 	TIFFErrorHandler (*TIFFSetErrorHandler)(TIFFErrorHandler);
    43 } lib;
    44 
    45 #ifdef LOAD_TIF_DYNAMIC
    46 int IMG_InitTIF()
    47 {
    48 	if ( lib.loaded == 0 ) {
    49 		lib.handle = SDL_LoadObject(LOAD_TIF_DYNAMIC);
    50 		if ( lib.handle == NULL ) {
    51 			return -1;
    52 		}
    53 		lib.TIFFClientOpen =
    54 			(TIFF* (*)(const char*, const char*, thandle_t, TIFFReadWriteProc, TIFFReadWriteProc, TIFFSeekProc, TIFFCloseProc, TIFFSizeProc, TIFFMapFileProc, TIFFUnmapFileProc))
    55 			SDL_LoadFunction(lib.handle, "TIFFClientOpen");
    56 		if ( lib.TIFFClientOpen == NULL ) {
    57 			SDL_UnloadObject(lib.handle);
    58 			return -1;
    59 		}
    60 		lib.TIFFClose =
    61 			(void (*)(TIFF*))
    62 			SDL_LoadFunction(lib.handle, "TIFFClose");
    63 		if ( lib.TIFFClose == NULL ) {
    64 			SDL_UnloadObject(lib.handle);
    65 			return -1;
    66 		}
    67 		lib.TIFFGetField =
    68 			(int (*)(TIFF*, ttag_t, ...))
    69 			SDL_LoadFunction(lib.handle, "TIFFGetField");
    70 		if ( lib.TIFFGetField == NULL ) {
    71 			SDL_UnloadObject(lib.handle);
    72 			return -1;
    73 		}
    74 		lib.TIFFReadRGBAImage =
    75 			(int (*)(TIFF*, uint32, uint32, uint32*, int))
    76 			SDL_LoadFunction(lib.handle, "TIFFReadRGBAImage");
    77 		if ( lib.TIFFReadRGBAImage == NULL ) {
    78 			SDL_UnloadObject(lib.handle);
    79 			return -1;
    80 		}
    81 		lib.TIFFSetErrorHandler =
    82 			(TIFFErrorHandler (*)(TIFFErrorHandler))
    83 			SDL_LoadFunction(lib.handle, "TIFFSetErrorHandler");
    84 		if ( lib.TIFFSetErrorHandler == NULL ) {
    85 			SDL_UnloadObject(lib.handle);
    86 			return -1;
    87 		}
    88 	}
    89 	++lib.loaded;
    90 
    91 	return 0;
    92 }
    93 void IMG_QuitTIF()
    94 {
    95 	if ( lib.loaded == 0 ) {
    96 		return;
    97 	}
    98 	if ( lib.loaded == 1 ) {
    99 		SDL_UnloadObject(lib.handle);
   100 	}
   101 	--lib.loaded;
   102 }
   103 #else
   104 int IMG_InitTIF()
   105 {
   106 	if ( lib.loaded == 0 ) {
   107 		lib.TIFFClientOpen = TIFFClientOpen;
   108 		lib.TIFFClose = TIFFClose;
   109 		lib.TIFFGetField = TIFFGetField;
   110 		lib.TIFFReadRGBAImage = TIFFReadRGBAImage;
   111 		lib.TIFFSetErrorHandler = TIFFSetErrorHandler;
   112 	}
   113 	++lib.loaded;
   114 
   115 	return 0;
   116 }
   117 void IMG_QuitTIF()
   118 {
   119 	if ( lib.loaded == 0 ) {
   120 		return;
   121 	}
   122 	if ( lib.loaded == 1 ) {
   123 	}
   124 	--lib.loaded;
   125 }
   126 #endif /* LOAD_TIF_DYNAMIC */
   127 
   128 /*
   129  * These are the thunking routine to use the SDL_RWops* routines from
   130  * libtiff's internals.
   131 */
   132 
   133 static tsize_t tiff_read(thandle_t fd, tdata_t buf, tsize_t size)
   134 {
   135 	return SDL_RWread((SDL_RWops*)fd, buf, 1, size);
   136 }
   137 
   138 static toff_t tiff_seek(thandle_t fd, toff_t offset, int origin)
   139 {
   140 	return SDL_RWseek((SDL_RWops*)fd, offset, origin);
   141 }
   142 
   143 static tsize_t tiff_write(thandle_t fd, tdata_t buf, tsize_t size)
   144 {
   145 	return SDL_RWwrite((SDL_RWops*)fd, buf, 1, size);
   146 }
   147 
   148 static int tiff_close(thandle_t fd)
   149 {
   150 	/*
   151 	 * We don't want libtiff closing our SDL_RWops*, but if it's not given
   152          * a routine to try, and if the image isn't a TIFF, it'll segfault.
   153 	 */
   154 	return 0;
   155 }
   156 
   157 static int tiff_map(thandle_t fd, tdata_t* pbase, toff_t* psize)
   158 {
   159 	return (0);
   160 }
   161 
   162 static void tiff_unmap(thandle_t fd, tdata_t base, toff_t size)
   163 {
   164 	return;
   165 }
   166 
   167 static toff_t tiff_size(thandle_t fd)
   168 {
   169 	Uint32 save_pos;
   170 	toff_t size;
   171 
   172 	save_pos = SDL_RWtell((SDL_RWops*)fd);
   173 	SDL_RWseek((SDL_RWops*)fd, 0, RW_SEEK_END);
   174         size = SDL_RWtell((SDL_RWops*)fd);
   175 	SDL_RWseek((SDL_RWops*)fd, save_pos, RW_SEEK_SET);
   176 	return size;
   177 }
   178 
   179 int IMG_isTIF(SDL_RWops* src)
   180 {
   181 	int start;
   182 	int is_TIF;
   183 	Uint8 magic[4];
   184 
   185 	if ( !src )
   186 		return 0;
   187 	start = SDL_RWtell(src);
   188 	is_TIF = 0;
   189 	if ( SDL_RWread(src, magic, 1, sizeof(magic)) == sizeof(magic) ) {
   190 		if ( (magic[0] == 'I' &&
   191                       magic[1] == 'I' &&
   192 		      magic[2] == 0x2a &&
   193                       magic[3] == 0x00) ||
   194 		     (magic[0] == 'M' &&
   195                       magic[1] == 'M' &&
   196 		      magic[2] == 0x00 &&
   197                       magic[3] == 0x2a) ) {
   198 			is_TIF = 1;
   199 		}
   200 	}
   201 	SDL_RWseek(src, start, RW_SEEK_SET);
   202 	return(is_TIF);
   203 }
   204 
   205 SDL_Surface* IMG_LoadTIF_RW(SDL_RWops* src)
   206 {
   207 	int start;
   208 	TIFF* tiff;
   209 	SDL_Surface* surface = NULL;
   210 	Uint32 img_width, img_height;
   211 	Uint32 Rmask, Gmask, Bmask, Amask;
   212 	Uint32 x, y;
   213 	Uint32 half;
   214 
   215 	if ( !src ) {
   216 		/* The error message has been set in SDL_RWFromFile */
   217 		return NULL;
   218 	}
   219 	start = SDL_RWtell(src);
   220 
   221 	if ( !IMG_Init(IMG_INIT_TIF) ) {
   222 		return NULL;
   223 	}
   224 
   225 	/* turn off memory mapped access with the m flag */
   226 	tiff = lib.TIFFClientOpen("SDL_image", "rm", (thandle_t)src, 
   227 		tiff_read, tiff_write, tiff_seek, tiff_close, tiff_size, tiff_map, tiff_unmap);
   228 	if(!tiff)
   229 		goto error;
   230 
   231 	/* Retrieve the dimensions of the image from the TIFF tags */
   232 	lib.TIFFGetField(tiff, TIFFTAG_IMAGEWIDTH, &img_width);
   233 	lib.TIFFGetField(tiff, TIFFTAG_IMAGELENGTH, &img_height);
   234 
   235 	Rmask = 0x000000FF;
   236 	Gmask = 0x0000FF00;
   237 	Bmask = 0x00FF0000;
   238 	Amask = 0xFF000000;
   239 	surface = SDL_AllocSurface(SDL_SWSURFACE, img_width, img_height, 32,
   240 		Rmask, Gmask, Bmask, Amask);
   241 	if(!surface)
   242 		goto error;
   243 	
   244 	if(!lib.TIFFReadRGBAImage(tiff, img_width, img_height, surface->pixels, 0))
   245 		goto error;
   246 
   247 	/* libtiff loads the image upside-down, flip it back */
   248 	half = img_height / 2;
   249 	for(y = 0; y < half; y++)
   250 	{
   251 	        Uint32 *top = (Uint32 *)surface->pixels + y * surface->pitch/4;
   252 	        Uint32 *bot = (Uint32 *)surface->pixels
   253 		              + (img_height - y - 1) * surface->pitch/4;
   254 		for(x = 0; x < img_width; x++)
   255 		{
   256 		        Uint32 tmp = top[x];
   257 			top[x] = bot[x];
   258 			bot[x] = tmp;
   259 		}
   260 	}
   261 	lib.TIFFClose(tiff);
   262 	
   263 	return surface;
   264 
   265 error:
   266 	SDL_RWseek(src, start, RW_SEEK_SET);
   267 	if ( surface ) {
   268 		SDL_FreeSurface(surface);
   269 	}
   270 	return NULL;
   271 }
   272 
   273 #else
   274 
   275 int IMG_InitTIF()
   276 {
   277 	IMG_SetError("TIFF images are not supported");
   278 	return(-1);
   279 }
   280 
   281 void IMG_QuitTIF()
   282 {
   283 }
   284 
   285 /* See if an image is contained in a data source */
   286 int IMG_isTIF(SDL_RWops *src)
   287 {
   288 	return(0);
   289 }
   290 
   291 /* Load a TIFF type image from an SDL datasource */
   292 SDL_Surface *IMG_LoadTIF_RW(SDL_RWops *src)
   293 {
   294 	return(NULL);
   295 }
   296 
   297 #endif /* LOAD_TIF */
   298 
   299 #endif /* !defined(__APPLE__) || defined(SDL_IMAGE_USE_COMMON_BACKEND) */