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IMG_tif.c
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/*
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SDL_image: An example image loading library for use with SDL
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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,
but WITHOUT ANY WARRANTY; without even the implied warranty of
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
License along with this library; if not, write to the Free Software
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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*/
/* This is a TIFF image file loading framework */
#include <stdio.h>
#include "SDL_image.h"
#ifdef LOAD_TIF
#include <tiffio.h>
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static struct {
int loaded;
void *handle;
TIFF* (*TIFFClientOpen)(const char*, const char*, thandle_t, TIFFReadWriteProc, TIFFReadWriteProc, TIFFSeekProc, TIFFCloseProc, TIFFSizeProc, TIFFMapFileProc, TIFFUnmapFileProc);
void (*TIFFClose)(TIFF*);
int (*TIFFGetField)(TIFF*, ttag_t, ...);
int (*TIFFReadRGBAImage)(TIFF*, uint32, uint32, uint32*, int);
TIFFErrorHandler (*TIFFSetErrorHandler)(TIFFErrorHandler);
} lib;
#ifdef LOAD_TIF_DYNAMIC
int IMG_InitTIF()
{
if ( lib.loaded == 0 ) {
lib.handle = SDL_LoadObject(LOAD_TIF_DYNAMIC);
if ( lib.handle == NULL ) {
return -1;
}
lib.TIFFClientOpen =
(TIFF* (*)(const char*, const char*, thandle_t, TIFFReadWriteProc, TIFFReadWriteProc, TIFFSeekProc, TIFFCloseProc, TIFFSizeProc, TIFFMapFileProc, TIFFUnmapFileProc))
SDL_LoadFunction(lib.handle, "TIFFClientOpen");
if ( lib.TIFFClientOpen == NULL ) {
SDL_UnloadObject(lib.handle);
return -1;
}
lib.TIFFClose =
(void (*)(TIFF*))
SDL_LoadFunction(lib.handle, "TIFFClose");
if ( lib.TIFFClose == NULL ) {
SDL_UnloadObject(lib.handle);
return -1;
}
lib.TIFFGetField =
(int (*)(TIFF*, ttag_t, ...))
SDL_LoadFunction(lib.handle, "TIFFGetField");
if ( lib.TIFFGetField == NULL ) {
SDL_UnloadObject(lib.handle);
return -1;
}
lib.TIFFReadRGBAImage =
(int (*)(TIFF*, uint32, uint32, uint32*, int))
SDL_LoadFunction(lib.handle, "TIFFReadRGBAImage");
if ( lib.TIFFReadRGBAImage == NULL ) {
SDL_UnloadObject(lib.handle);
return -1;
}
lib.TIFFSetErrorHandler =
(TIFFErrorHandler (*)(TIFFErrorHandler))
SDL_LoadFunction(lib.handle, "TIFFSetErrorHandler");
if ( lib.TIFFSetErrorHandler == NULL ) {
SDL_UnloadObject(lib.handle);
return -1;
}
}
++lib.loaded;
return 0;
}
void IMG_QuitTIF()
{
if ( lib.loaded == 0 ) {
return;
}
if ( lib.loaded == 1 ) {
SDL_UnloadObject(lib.handle);
}
--lib.loaded;
}
#else
int IMG_InitTIF()
{
if ( lib.loaded == 0 ) {
lib.TIFFClientOpen = TIFFClientOpen;
lib.TIFFClose = TIFFClose;
lib.TIFFGetField = TIFFGetField;
lib.TIFFReadRGBAImage = TIFFReadRGBAImage;
lib.TIFFSetErrorHandler = TIFFSetErrorHandler;
}
++lib.loaded;
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return 0;
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}
void IMG_QuitTIF()
{
if ( lib.loaded == 0 ) {
return;
}
if ( lib.loaded == 1 ) {
}
--lib.loaded;
}
#endif /* LOAD_TIF_DYNAMIC */
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/*
* These are the thunking routine to use the SDL_RWops* routines from
* libtiff's internals.
*/
static tsize_t tiff_read(thandle_t fd, tdata_t buf, tsize_t size)
{
return SDL_RWread((SDL_RWops*)fd, buf, 1, size);
}
static toff_t tiff_seek(thandle_t fd, toff_t offset, int origin)
{
return SDL_RWseek((SDL_RWops*)fd, offset, origin);
}
static tsize_t tiff_write(thandle_t fd, tdata_t buf, tsize_t size)
{
return SDL_RWwrite((SDL_RWops*)fd, buf, 1, size);
}
static int tiff_close(thandle_t fd)
{
/*
* We don't want libtiff closing our SDL_RWops*, but if it's not given
* a routine to try, and if the image isn't a TIFF, it'll segfault.
*/
return 0;
}
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static int tiff_map(thandle_t fd, tdata_t* pbase, toff_t* psize)
{
return (0);
}
static void tiff_unmap(thandle_t fd, tdata_t base, toff_t size)
{
return;
}
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static toff_t tiff_size(thandle_t fd)
{
Uint32 save_pos;
toff_t size;
save_pos = SDL_RWtell((SDL_RWops*)fd);
SDL_RWseek((SDL_RWops*)fd, 0, SEEK_END);
size = SDL_RWtell((SDL_RWops*)fd);
SDL_RWseek((SDL_RWops*)fd, save_pos, SEEK_SET);
return size;
}
int IMG_isTIF(SDL_RWops* src)
{
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int start;
int is_TIF;
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Uint8 magic[4];
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if ( !src )
return 0;
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start = SDL_RWtell(src);
is_TIF = 0;
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if ( SDL_RWread(src, magic, 1, sizeof(magic)) == sizeof(magic) ) {
if ( (magic[0] == 'I' &&
magic[1] == 'I' &&
magic[2] == 0x2a &&
magic[3] == 0x00) ||
(magic[0] == 'M' &&
magic[1] == 'M' &&
magic[2] == 0x00 &&
magic[3] == 0x2a) ) {
is_TIF = 1;
}
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}
SDL_RWseek(src, start, SEEK_SET);
return(is_TIF);
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}
SDL_Surface* IMG_LoadTIF_RW(SDL_RWops* src)
{
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int start;
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TIFF* tiff;
SDL_Surface* surface = NULL;
Uint32 img_width, img_height;
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Uint32 Rmask, Gmask, Bmask, Amask;
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Uint32 x, y;
Uint32 half;
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if ( !src ) {
/* The error message has been set in SDL_RWFromFile */
return NULL;
}
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start = SDL_RWtell(src);
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if ( IMG_InitTIF() < 0 ) {
return NULL;
}
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/* turn off memory mapped access with the m flag */
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tiff = lib.TIFFClientOpen("SDL_image", "rm", (thandle_t)src,
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tiff_read, tiff_write, tiff_seek, tiff_close, tiff_size, tiff_map, tiff_unmap);
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if(!tiff)
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goto error;
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/* Retrieve the dimensions of the image from the TIFF tags */
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lib.TIFFGetField(tiff, TIFFTAG_IMAGEWIDTH, &img_width);
lib.TIFFGetField(tiff, TIFFTAG_IMAGELENGTH, &img_height);
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Rmask = 0x000000FF;
Gmask = 0x0000FF00;
Bmask = 0x00FF0000;
Amask = 0xFF000000;
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surface = SDL_AllocSurface(SDL_SWSURFACE, img_width, img_height, 32,
Rmask, Gmask, Bmask, Amask);
if(!surface)
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goto error;
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if(!lib.TIFFReadRGBAImage(tiff, img_width, img_height, surface->pixels, 0))
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goto error;
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/* libtiff loads the image upside-down, flip it back */
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half = img_height / 2;
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for(y = 0; y < half; y++)
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{
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Uint32 *top = (Uint32 *)surface->pixels + y * surface->pitch/4;
Uint32 *bot = (Uint32 *)surface->pixels
+ (img_height - y - 1) * surface->pitch/4;
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for(x = 0; x < img_width; x++)
{
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Uint32 tmp = top[x];
top[x] = bot[x];
bot[x] = tmp;
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}
}
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lib.TIFFClose(tiff);
IMG_QuitTIF();
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return surface;
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error:
SDL_RWseek(src, start, SEEK_SET);
if ( surface ) {
SDL_FreeSurface(surface);
}
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IMG_QuitTIF();
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return NULL;
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}
#else
/* See if an image is contained in a data source */
int IMG_isTIF(SDL_RWops *src)
{
return(0);
}
/* Load a TIFF type image from an SDL datasource */
SDL_Surface *IMG_LoadTIF_RW(SDL_RWops *src)
{
return(NULL);
}
#endif /* LOAD_TIF */