SDL_image: An example image loading library for use with SDL

Copyright (C) 1997-2012 Sam Lantinga <slouken@libsdl.org>

This software is provided 'as-is', without any express or implied

warranty. In no event will the authors be held liable for any damages

arising from the use of this software.

Permission is granted to anyone to use this software for any purpose,

including commercial applications, and to alter it and redistribute it

freely, subject to the following restrictions:

1. The origin of this software must not be misrepresented; you must not

claim that you wrote the original software. If you use this software

in a product, an acknowledgment in the product documentation would be

appreciated but is not required.

2. Altered source versions must be plainly marked as such, and must not be

misrepresented as being the original software.

3. This notice may not be removed or altered from any source distribution.

*/

#if !defined(__APPLE__) || defined(SDL_IMAGE_USE_COMMON_BACKEND)

/* This is a TIFF image file loading framework */

#include <stdio.h>

#include "SDL_image.h"

#ifdef LOAD_TIF

#include <tiffio.h>

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

{

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;

}

{

if ( lib.loaded == 0 ) {

return;

}

if ( lib.loaded == 1 ) {

SDL_UnloadObject(lib.handle);

}

--lib.loaded;

}

#else

{

if ( lib.loaded == 0 ) {

lib.TIFFClientOpen = TIFFClientOpen;

lib.TIFFClose = TIFFClose;

lib.TIFFGetField = TIFFGetField;

lib.TIFFReadRGBAImage = TIFFReadRGBAImage;

lib.TIFFSetErrorHandler = TIFFSetErrorHandler;

}

++lib.loaded;

return 0;

{

if ( lib.loaded == 0 ) {

return;

}

if ( lib.loaded == 1 ) {

}

--lib.loaded;

}

#endif /* LOAD_TIF_DYNAMIC */

/*

* 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;

}

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;

}

static toff_t tiff_size(thandle_t fd)

{

Uint32 save_pos;

toff_t size;

save_pos = SDL_RWtell((SDL_RWops*)fd);

return size;

}

int IMG_isTIF(SDL_RWops* src)

{

int start;

int is_TIF;

if ( !src )

return 0;

start = SDL_RWtell(src);

is_TIF = 0;

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;

}

}

SDL_Surface* IMG_LoadTIF_RW(SDL_RWops* src)

{

TIFF* tiff;

SDL_Surface* surface = NULL;

Uint32 img_width, img_height;

Uint32 x, y;

Uint32 half;

if ( !src ) {

/* The error message has been set in SDL_RWFromFile */

return NULL;

}

return NULL;

}

/* Retrieve the dimensions of the image from the TIFF tags */

lib.TIFFGetField(tiff, TIFFTAG_IMAGEWIDTH, &img_width);

lib.TIFFGetField(tiff, TIFFTAG_IMAGELENGTH, &img_height);

Rmask = 0x000000FF;

Gmask = 0x0000FF00;

Bmask = 0x00FF0000;

Amask = 0xFF000000;

surface = SDL_AllocSurface(SDL_SWSURFACE, img_width, img_height, 32,

Rmask, Gmask, Bmask, Amask);

if(!surface)

Uint32 *top = (Uint32 *)surface->pixels + y * surface->pitch/4;

Uint32 *bot = (Uint32 *)surface->pixels

+ (img_height - y - 1) * surface->pitch/4;

for(x = 0; x < img_width; x++)

{

Uint32 tmp = top[x];

top[x] = bot[x];

bot[x] = tmp;

}

}

return surface;

error:

if ( surface ) {

SDL_FreeSurface(surface);

}

return NULL;

}

#else

int IMG_InitTIF()

{

IMG_SetError("TIFF images are not supported");

return(-1);

}

void IMG_QuitTIF()

{

}

/* 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 */

#endif /* !defined(__APPLE__) || defined(SDL_IMAGE_USE_COMMON_BACKEND) */