/*

* IMG_ImageIO.c

* SDL_image

*

* Created by Eric Wing on 1/1/09.

* Copyright 2009 __MyCompanyName__. All rights reserved.

*

*/

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

#include "SDL_image.h"

// Used because CGDataProviderCreate became deprecated in 10.5

#include <AvailabilityMacros.h>

#include <TargetConditionals.h>

#include <Foundation/Foundation.h>

#if (TARGET_OS_IPHONE == 1) || (TARGET_IPHONE_SIMULATOR == 1)

#ifdef ALLOW_UIIMAGE_FALLBACK

#define USE_UIIMAGE_BACKEND() ([UIImage instancesRespondToSelector:@selector(initWithCGImage:scale:orientation:)] == NO)

#else

#define USE_UIIMAGE_BACKEND() (Internal_checkImageIOisAvailable())

#endif

#import <MobileCoreServices/MobileCoreServices.h> // for UTCoreTypes.h

#import <ImageIO/ImageIO.h>

#import <UIKit/UIImage.h>

#else

// For ImageIO framework and also LaunchServices framework (for UTIs)

#include <ApplicationServices/ApplicationServices.h>

#endif

/**************************************************************

***** Begin Callback functions for block reading *************

**************************************************************/

// This callback reads some bytes from an SDL_rwops and copies it

// to a Quartz buffer (supplied by Apple framework).

static size_t MyProviderGetBytesCallback(void* rwops_userdata, void* quartz_buffer, size_t the_count)

{

return (size_t)SDL_RWread((struct SDL_RWops *)rwops_userdata, quartz_buffer, 1, the_count);

}

// This callback is triggered when the data provider is released

// so you can clean up any resources.

static void MyProviderReleaseInfoCallback(void* rwops_userdata)

{

// What should I put here?

// I think the user and SDL_RWops controls closing, so I don't do anything.

}

static void MyProviderRewindCallback(void* rwops_userdata)

{

SDL_RWseek((struct SDL_RWops *)rwops_userdata, 0, RW_SEEK_SET);

}

#if MAC_OS_X_VERSION_MAX_ALLOWED >= 1050 // CGDataProviderCreateSequential was introduced in 10.5; CGDataProviderCreate is deprecated

off_t MyProviderSkipForwardBytesCallback(void* rwops_userdata, off_t the_count)

{

off_t start_position = SDL_RWtell((struct SDL_RWops *)rwops_userdata);

SDL_RWseek((struct SDL_RWops *)rwops_userdata, the_count, RW_SEEK_CUR);

off_t end_position = SDL_RWtell((struct SDL_RWops *)rwops_userdata);

return (end_position - start_position);

}

#else // CGDataProviderCreate was deprecated in 10.5

static void MyProviderSkipBytesCallback(void* rwops_userdata, size_t the_count)

{

SDL_RWseek((struct SDL_RWops *)rwops_userdata, the_count, RW_SEEK_CUR);

}

#endif

/**************************************************************

***** End Callback functions for block reading ***************

**************************************************************/

// This creates a CGImageSourceRef which is a handle to an image that can be used to examine information

// about the image or load the actual image data.

static CGImageSourceRef CreateCGImageSourceFromRWops(SDL_RWops* rw_ops, CFDictionaryRef hints_and_options)

{

CGImageSourceRef source_ref;

// Similar to SDL_RWops, Apple has their own callbacks for dealing with data streams.

#if MAC_OS_X_VERSION_MAX_ALLOWED >= 1050 // CGDataProviderCreateSequential was introduced in 10.5; CGDataProviderCreate is deprecated

CGDataProviderSequentialCallbacks provider_callbacks =

{

0,

MyProviderGetBytesCallback,

MyProviderSkipForwardBytesCallback,

MyProviderRewindCallback,

MyProviderReleaseInfoCallback

};

CGDataProviderRef data_provider = CGDataProviderCreateSequential(rw_ops, &provider_callbacks);

#else // CGDataProviderCreate was deprecated in 10.5

CGDataProviderCallbacks provider_callbacks =

{

MyProviderGetBytesCallback,

MyProviderSkipBytesCallback,

MyProviderRewindCallback,

MyProviderReleaseInfoCallback

};

CGDataProviderRef data_provider = CGDataProviderCreate(rw_ops, &provider_callbacks);

#endif

// Get the CGImageSourceRef.

// The dictionary can be NULL or contain hints to help ImageIO figure out the image type.

source_ref = CGImageSourceCreateWithDataProvider(data_provider, hints_and_options);

return source_ref;

}

/* Create a CGImageSourceRef from a file. */

/* Remember to CFRelease the created source when done. */

static CGImageSourceRef CreateCGImageSourceFromFile(const char* the_path)

{

CFURLRef the_url = NULL;

CGImageSourceRef source_ref = NULL;

CFStringRef cf_string = NULL;

/* Create a CFString from a C string */

cf_string = CFStringCreateWithCString(NULL, the_path, kCFStringEncodingUTF8);

if (!cf_string) {

return NULL;

}

/* Create a CFURL from a CFString */

the_url = CFURLCreateWithFileSystemPath(NULL, cf_string, kCFURLPOSIXPathStyle, false);

/* Don't need the CFString any more (error or not) */

CFRelease(cf_string);

if(!the_url)

{

return NULL;

}

source_ref = CGImageSourceCreateWithURL(the_url, NULL);

/* Don't need the URL any more (error or not) */

CFRelease(the_url);

return source_ref;

}

static CGImageRef CreateCGImageFromCGImageSource(CGImageSourceRef image_source)

{

CGImageRef image_ref = NULL;

if(NULL == image_source)

{

return NULL;

}

// Get the first item in the image source (some image formats may

// contain multiple items).

image_ref = CGImageSourceCreateImageAtIndex(image_source, 0, NULL);

if(NULL == image_ref)

{

IMG_SetError("CGImageSourceCreateImageAtIndex() failed");

}

return image_ref;

}

static CFDictionaryRef CreateHintDictionary(CFStringRef uti_string_hint)

{

CFDictionaryRef hint_dictionary = NULL;

if(uti_string_hint != NULL)

{

// Do a bunch of work to setup a CFDictionary containing the jpeg compression properties.

CFStringRef the_keys[1];

CFStringRef the_values[1];

the_keys[0] = kCGImageSourceTypeIdentifierHint;

the_values[0] = uti_string_hint;

// kCFTypeDictionaryKeyCallBacks or kCFCopyStringDictionaryKeyCallBacks?

hint_dictionary = CFDictionaryCreate(NULL, (const void**)&the_keys, (const void**)&the_values, 1, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);

}

return hint_dictionary;

}

// Once we have our image, we need to get it into an SDL_Surface

{

/* This code is adapted from Apple's Documentation found here:

* http://developer.apple.com/documentation/GraphicsImaging/Conceptual/OpenGL-MacProgGuide/index.html

* Listing 9-4††Using a Quartz image as a texture source.

* Unfortunately, this guide doesn't show what to do about

* non-RGBA image formats so I'm making the rest up.

* All this code should be scrutinized.

*/

size_t w = CGImageGetWidth(image_ref);

size_t h = CGImageGetHeight(image_ref);

CGRect rect = {{0, 0}, {w, h}};

CGImageAlphaInfo alpha = CGImageGetAlphaInfo(image_ref);

//size_t bits_per_pixel = CGImageGetBitsPerPixel(image_ref);

size_t bits_per_component = 8;

SDL_Surface* surface;

Uint32 Amask;

Uint32 Rmask;

Uint32 Gmask;

Uint32 Bmask;

CGContextRef bitmap_context;

CGBitmapInfo bitmap_info;

/* This sets up a color space that results in identical values

* as the image data itself, which is the same as the standalone

* libpng loader.

* Thanks to Allegro. :)

*/

CGFloat whitePoint[3] = { 0.950, 1.000, 1.089 };

CGFloat blackPoint[3] = { 0.000, 0.000, 0.000 };

CGFloat gamma[3] = { 2.2, 2.2, 2.2 };

CGFloat matrix[9] = {

0.412, 0.213, 0.019,

0.358, 0.715, 0.119,

0.180, 0.072, 0.950

};

CGColorSpaceRef color_space =

CGColorSpaceCreateCalibratedRGB(

whitePoint, blackPoint, gamma, matrix

);

if (alpha == kCGImageAlphaNone ||

alpha == kCGImageAlphaNoneSkipFirst ||

alpha == kCGImageAlphaNoneSkipLast) {

bitmap_info = kCGImageAlphaNoneSkipFirst | kCGBitmapByteOrder32Host; /* XRGB */

Amask = 0x00000000;

} else {

/* kCGImageAlphaFirst isn't supported */

//bitmap_info = kCGImageAlphaFirst | kCGBitmapByteOrder32Host; /* ARGB */

bitmap_info = kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host; /* ARGB */

Amask = 0xFF000000;

}

Rmask = 0x00FF0000;

Gmask = 0x0000FF00;

Bmask = 0x000000FF;

surface = SDL_CreateRGBSurface(SDL_SWSURFACE, w, h, 32, Rmask, Gmask, Bmask, Amask);

if (surface)

{

// Sets up a context to be drawn to with surface->pixels as the area to be drawn to

bitmap_context = CGBitmapContextCreate(

surface->pixels,

surface->w,

surface->h,

bits_per_component,

surface->pitch,

color_space,

bitmap_info

);

// Draws the image into the context's image_data

CGContextDrawImage(bitmap_context, rect, image_ref);

CGContextRelease(bitmap_context);

// FIXME: Reverse the premultiplied alpha

if ((bitmap_info & kCGBitmapAlphaInfoMask) == kCGImageAlphaPremultipliedFirst) {

int i, j;

Uint8 *p = (Uint8 *)surface->pixels;

for (i = surface->h * surface->pitch/4; i--; ) {

#if __LITTLE_ENDIAN__

Uint8 A = p[3];

if (A) {

for (j = 0; j < 3; ++j) {

p[j] = (p[j] * 255) / A;

}

}

#else

Uint8 A = p[0];

if (A) {

for (j = 1; j < 4; ++j) {

p[j] = (p[j] * 255) / A;

}

}

#endif /* ENDIAN */

p += 4;

}

}

}

if (color_space)

{

CGColorSpaceRelease(color_space);

}

return surface;

}

static SDL_Surface* Create_SDL_Surface_From_CGImage_Index(CGImageRef image_ref)

{

size_t w = CGImageGetWidth(image_ref);

size_t h = CGImageGetHeight(image_ref);

size_t bits_per_pixel = CGImageGetBitsPerPixel(image_ref);

size_t bytes_per_row = CGImageGetBytesPerRow(image_ref);

SDL_Surface* surface;

SDL_Palette* palette;

CGColorSpaceRef color_space = CGImageGetColorSpace(image_ref);

CGColorSpaceRef base_color_space = CGColorSpaceGetBaseColorSpace(color_space);

size_t num_components = CGColorSpaceGetNumberOfComponents(base_color_space);

size_t num_entries = CGColorSpaceGetColorTableCount(color_space);

uint8_t *entry, entries[num_components * num_entries];

/* What do we do if it's not RGB? */

if (num_components != 3) {

SDL_SetError("Unknown colorspace components %lu", num_components);

return NULL;

}

if (bits_per_pixel != 8) {

SDL_SetError("Unknown bits_per_pixel %lu", bits_per_pixel);

return NULL;

}

CGColorSpaceGetColorTable(color_space, entries);

surface = SDL_CreateRGBSurface(SDL_SWSURFACE, w, h, bits_per_pixel, 0, 0, 0, 0);

if (surface) {

uint8_t* pixels = (uint8_t*)surface->pixels;

CGDataProviderRef provider = CGImageGetDataProvider(image_ref);

NSData* data = (id)CGDataProviderCopyData(provider);

[data autorelease];

const uint8_t* bytes = [data bytes];

size_t i;

palette = surface->format->palette;

for (i = 0, entry = entries; i < num_entries; ++i) {

palette->colors[i].r = entry[0];

palette->colors[i].g = entry[1];

palette->colors[i].b = entry[2];

entry += num_components;

}

for (i = 0; i < h; ++i) {

SDL_memcpy(pixels, bytes, w);

pixels += surface->pitch;

bytes += bytes_per_row;

}

}

return surface;

}

static SDL_Surface* Create_SDL_Surface_From_CGImage(CGImageRef image_ref)

{

CGColorSpaceRef color_space = CGImageGetColorSpace(image_ref);

if (CGColorSpaceGetModel(color_space) == kCGColorSpaceModelIndexed) {

return Create_SDL_Surface_From_CGImage_Index(image_ref);

} else {

return Create_SDL_Surface_From_CGImage_RGB(image_ref);

}

}

#pragma mark -

#pragma mark IMG_Init stubs

#if !defined(ALLOW_UIIMAGE_FALLBACK) && ((TARGET_OS_IPHONE == 1) || (TARGET_IPHONE_SIMULATOR == 1))

static int Internal_checkImageIOisAvailable() {

// just check if we are running on ios 4 or more, else throw exception

if ([UIImage instancesRespondToSelector:@selector(initWithCGImage:scale:orientation:)])

return 0;

[NSException raise:@"UIImage fallback not enabled at compile time"

format:@"ImageIO is not available on your platform, please recompile SDL_Image with ALLOW_UIIMAGE_FALLBACK."];

return -1;

}

#endif

int IMG_InitJPG()

{

return 0;

}

void IMG_QuitJPG()

{

}

int IMG_InitPNG()

{

return 0;

}

void IMG_QuitPNG()

{

}

int IMG_InitTIF()

{

return 0;

}

void IMG_QuitTIF()

{

}

#pragma mark -

#pragma mark Get type of image

static int Internal_isType_UIImage (SDL_RWops *rw_ops, CFStringRef uti_string_to_test)

{

int is_type = 0;

#if defined(ALLOW_UIIMAGE_FALLBACK) && ((TARGET_OS_IPHONE == 1) || (TARGET_IPHONE_SIMULATOR == 1))

int start = SDL_RWtell(rw_ops);

if ((0 == CFStringCompare(uti_string_to_test, kUTTypeICO, 0)) ||

(0 == CFStringCompare(uti_string_to_test, CFSTR("com.microsoft.cur"), 0))) {

// The Win32 ICO file header (14 bytes)

Uint16 bfReserved;

Uint16 bfType;

Uint16 bfCount;

int type = (0 == CFStringCompare(uti_string_to_test, kUTTypeICO, 0)) ? 1 : 2;

bfReserved = SDL_ReadLE16(rw_ops);

bfType = SDL_ReadLE16(rw_ops);

bfCount = SDL_ReadLE16(rw_ops);

if ((bfReserved == 0) && (bfType == type) && (bfCount != 0))

is_type = 1;

} else if (0 == CFStringCompare(uti_string_to_test, kUTTypeBMP, 0)) {

char magic[2];

if ( SDL_RWread(rw_ops, magic, sizeof(magic), 1) ) {

if ( strncmp(magic, "BM", 2) == 0 ) {

is_type = 1;

}

}

} else if (0 == CFStringCompare(uti_string_to_test, kUTTypeGIF, 0)) {

char magic[6];

if ( SDL_RWread(rw_ops, magic, sizeof(magic), 1) ) {

if ( (strncmp(magic, "GIF", 3) == 0) &&

((memcmp(magic + 3, "87a", 3) == 0) ||

(memcmp(magic + 3, "89a", 3) == 0)) ) {

is_type = 1;

}

}

} else if (0 == CFStringCompare(uti_string_to_test, kUTTypeJPEG, 0)) {

int in_scan = 0;

Uint8 magic[4];

// This detection code is by Steaphan Greene <stea@cs.binghamton.edu>

// Blame me, not Sam, if this doesn't work right. */

// And don't forget to report the problem to the the sdl list too! */

if ( SDL_RWread(rw_ops, magic, 2, 1) ) {

if ( (magic[0] == 0xFF) && (magic[1] == 0xD8) ) {

is_type = 1;

while (is_type == 1) {

if(SDL_RWread(rw_ops, magic, 1, 2) != 2) {

is_type = 0;

} else if( (magic[0] != 0xFF) && (in_scan == 0) ) {

is_type = 0;

} else if( (magic[0] != 0xFF) || (magic[1] == 0xFF) ) {

/* Extra padding in JPEG (legal) */

/* or this is data and we are scanning */

SDL_RWseek(rw_ops, -1, SEEK_CUR);

} else if(magic[1] == 0xD9) {

/* Got to end of good JPEG */

break;

} else if( (in_scan == 1) && (magic[1] == 0x00) ) {

/* This is an encoded 0xFF within the data */

} else if( (magic[1] >= 0xD0) && (magic[1] < 0xD9) ) {

/* These have nothing else */

} else if(SDL_RWread(rw_ops, magic+2, 1, 2) != 2) {

is_type = 0;

} else {

/* Yes, it's big-endian */

Uint32 start;

Uint32 size;

Uint32 end;

start = SDL_RWtell(rw_ops);

size = (magic[2] << 8) + magic[3];

end = SDL_RWseek(rw_ops, size-2, SEEK_CUR);

if ( end != start + size - 2 ) is_type = 0;

if ( magic[1] == 0xDA ) {

/* Now comes the actual JPEG meat */

#ifdef FAST_IS_JPEG

/* Ok, I'm convinced. It is a JPEG. */

break;

#else

/* I'm not convinced. Prove it! */

in_scan = 1;

#endif

}

}

}

}

}

} else if (0 == CFStringCompare(uti_string_to_test, kUTTypePNG, 0)) {

Uint8 magic[4];

if ( SDL_RWread(rw_ops, magic, 1, sizeof(magic)) == sizeof(magic) ) {

if ( magic[0] == 0x89 &&

magic[1] == 'P' &&

magic[2] == 'N' &&

magic[3] == 'G' ) {

is_type = 1;

}

}

} else if (0 == CFStringCompare(uti_string_to_test, CFSTR("com.truevision.tga-image"), 0)) {

//TODO: fill me!

} else if (0 == CFStringCompare(uti_string_to_test, kUTTypeTIFF, 0)) {

Uint8 magic[4];

if ( SDL_RWread(rw_ops, 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_type = 1;

}

}

}

SDL_RWseek(rw_ops, start, SEEK_SET);

#endif /* #if defined(ALLOW_UIIMAGE_FALLBACK) && ((TARGET_OS_IPHONE == 1) || (TARGET_IPHONE_SIMULATOR == 1)) */

return is_type;

}

static int Internal_isType_ImageIO (SDL_RWops *rw_ops, CFStringRef uti_string_to_test)

{

int is_type = 0;

CFDictionaryRef hint_dictionary = CreateHintDictionary(uti_string_to_test);

CGImageSourceRef image_source = CreateCGImageSourceFromRWops(rw_ops, hint_dictionary);

if (hint_dictionary != NULL) {

CFRelease(hint_dictionary);

}

if (NULL == image_source) {

// reset the file pointer

SDL_RWseek(rw_ops, start, SEEK_SET);

return 0;

}

// This will get the UTI of the container, not the image itself.

// Under most cases, this won't be a problem.

// But if a person passes an icon file which contains a bmp,

// the format will be of the icon file.

// But I think the main SDL_image codebase has this same problem so I'm not going to worry about it.

CFStringRef uti_type = CGImageSourceGetType(image_source);

// CFShow(uti_type);

// Unsure if we really want conformance or equality

is_type = (int)UTTypeConformsTo(uti_string_to_test, uti_type);

CFRelease(image_source);

// reset the file pointer

SDL_RWseek(rw_ops, start, SEEK_SET);

return is_type;

}

static int Internal_isType (SDL_RWops *rw_ops, CFStringRef uti_string_to_test)

{

if (rw_ops == NULL)

return 0;

#if (TARGET_OS_IPHONE == 1) || (TARGET_IPHONE_SIMULATOR == 1)

if (USE_UIIMAGE_BACKEND())

return Internal_isType_UIImage(rw_ops, uti_string_to_test);

else

#endif

return Internal_isType_ImageIO(rw_ops, uti_string_to_test);

}

int IMG_isCUR(SDL_RWops *src)

{

/* FIXME: Is this a supported type? */

return Internal_isType(src, CFSTR("com.microsoft.cur"));

}

int IMG_isICO(SDL_RWops *src)

{

return Internal_isType(src, kUTTypeICO);

}

int IMG_isBMP(SDL_RWops *src)

{

return Internal_isType(src, kUTTypeBMP);

}

int IMG_isGIF(SDL_RWops *src)

{

return Internal_isType(src, kUTTypeGIF);

}

// Note: JPEG 2000 is kUTTypeJPEG2000

int IMG_isJPG(SDL_RWops *src)

{

return Internal_isType(src, kUTTypeJPEG);

}

int IMG_isPNG(SDL_RWops *src)

{

return Internal_isType(src, kUTTypePNG);

}

// This isn't a public API function. Apple seems to be able to identify tga's.

int IMG_isTGA(SDL_RWops *src)

{

return Internal_isType(src, CFSTR("com.truevision.tga-image"));

}

int IMG_isTIF(SDL_RWops *src)

{

return Internal_isType(src, kUTTypeTIFF);

}

#pragma mark -

#pragma mark Load image engine

static SDL_Surface *LoadImageFromRWops_UIImage (SDL_RWops* rw_ops, CFStringRef uti_string_hint)

{

SDL_Surface *sdl_surface = NULL;

#if defined(ALLOW_UIIMAGE_FALLBACK) && ((TARGET_OS_IPHONE == 1) || (TARGET_IPHONE_SIMULATOR == 1))

NSAutoreleasePool* autorelease_pool = [[NSAutoreleasePool alloc] init];

UIImage *ui_image;

int bytes_read = 0;

// I don't know what a good size is.

// Max recommended texture size is 1024x1024 on iPhone so maybe base it on that?

const int block_size = 1024*4;

char temp_buffer[block_size];

NSMutableData* ns_data = [[NSMutableData alloc] initWithCapacity:1024*1024*4];

do {

bytes_read = SDL_RWread(rw_ops, temp_buffer, 1, block_size);

[ns_data appendBytes:temp_buffer length:bytes_read];

} while (bytes_read > 0);

ui_image = [[UIImage alloc] initWithData:ns_data];

if (ui_image != nil)

sdl_surface = Create_SDL_Surface_From_CGImage([ui_image CGImage]);

[ui_image release];

[ns_data release];

[autorelease_pool drain];

#endif /* #if defined(ALLOW_UIIMAGE_FALLBACK) && ((TARGET_OS_IPHONE == 1) || (TARGET_IPHONE_SIMULATOR == 1)) */

return sdl_surface;

}

static SDL_Surface *LoadImageFromRWops_ImageIO (SDL_RWops *rw_ops, CFStringRef uti_string_hint)

{

CFDictionaryRef hint_dictionary = CreateHintDictionary(uti_string_hint);

CGImageSourceRef image_source = CreateCGImageSourceFromRWops(rw_ops, hint_dictionary);

if (hint_dictionary != NULL)

CFRelease(hint_dictionary);

if (NULL == image_source)

return NULL;

CGImageRef image_ref = CreateCGImageFromCGImageSource(image_source);

CFRelease(image_source);

if (NULL == image_ref)

return NULL;

SDL_Surface *sdl_surface = Create_SDL_Surface_From_CGImage(image_ref);

CFRelease(image_ref);

return sdl_surface;

}

static SDL_Surface *LoadImageFromRWops (SDL_RWops *rw_ops, CFStringRef uti_string_hint)

{

#if (TARGET_OS_IPHONE == 1) || (TARGET_IPHONE_SIMULATOR == 1)

if (USE_UIIMAGE_BACKEND())

return LoadImageFromRWops_UIImage(rw_ops, uti_string_hint);

else

#endif

return LoadImageFromRWops_ImageIO(rw_ops, uti_string_hint);

}

static SDL_Surface* LoadImageFromFile_UIImage (const char *file)

{

SDL_Surface *sdl_surface = NULL;

#if defined(ALLOW_UIIMAGE_FALLBACK) && ((TARGET_OS_IPHONE == 1) || (TARGET_IPHONE_SIMULATOR == 1))

NSAutoreleasePool* autorelease_pool = [[NSAutoreleasePool alloc] init];

NSString *ns_string = [[NSString alloc] initWithUTF8String:file];

UIImage *ui_image = [[UIImage alloc] initWithContentsOfFile:ns_string];

if (ui_image != nil)

sdl_surface = Create_SDL_Surface_From_CGImage([ui_image CGImage]);

[ui_image release];

[ns_string release];

[autorelease_pool drain];

#endif /* #if defined(ALLOW_UIIMAGE_FALLBACK) && ((TARGET_OS_IPHONE == 1) || (TARGET_IPHONE_SIMULATOR == 1)) */

return sdl_surface;

}

static SDL_Surface* LoadImageFromFile_ImageIO (const char *file)

{

CGImageSourceRef image_source = NULL;

image_source = CreateCGImageSourceFromFile(file);

if(NULL == image_source)

return NULL;

CGImageRef image_ref = CreateCGImageFromCGImageSource(image_source);

CFRelease(image_source);

if (NULL == image_ref)

return NULL;

SDL_Surface *sdl_surface = Create_SDL_Surface_From_CGImage(image_ref);

CFRelease(image_ref);

return sdl_surface;

}

static SDL_Surface* LoadImageFromFile (const char *file)

{

#if (TARGET_OS_IPHONE == 1) || (TARGET_IPHONE_SIMULATOR == 1)

if (USE_UIIMAGE_BACKEND())

return LoadImageFromFile_UIImage(file);

else

#endif

return LoadImageFromFile_ImageIO(file);

}

SDL_Surface* IMG_LoadCUR_RW (SDL_RWops *src)

{

/* FIXME: Is this a supported type? */

return LoadImageFromRWops(src, CFSTR("com.microsoft.cur"));

}

SDL_Surface* IMG_LoadICO_RW (SDL_RWops *src)

{

return LoadImageFromRWops(src, kUTTypeICO);

}

SDL_Surface* IMG_LoadBMP_RW (SDL_RWops *src)

{

return LoadImageFromRWops(src, kUTTypeBMP);

}

SDL_Surface* IMG_LoadGIF_RW (SDL_RWops *src)

{

return LoadImageFromRWops (src, kUTTypeGIF);

}

SDL_Surface* IMG_LoadJPG_RW (SDL_RWops *src)

{

return LoadImageFromRWops (src, kUTTypeJPEG);

}

SDL_Surface* IMG_LoadPNG_RW (SDL_RWops *src)

{

return LoadImageFromRWops (src, kUTTypePNG);

}

SDL_Surface* IMG_LoadTGA_RW (SDL_RWops *src)

{

return LoadImageFromRWops(src, CFSTR("com.truevision.tga-image"));

}

SDL_Surface* IMG_LoadTIF_RW (SDL_RWops *src)

{

return LoadImageFromRWops(src, kUTTypeTIFF);

}

// Since UIImage doesn't really support streams well, we should optimize for the file case.

// Apple provides both stream and file loading functions in ImageIO.

// Potentially, Apple can optimize for either case.

SDL_Surface* IMG_Load (const char *file)

{

SDL_Surface* sdl_surface = NULL;

sdl_surface = LoadImageFromFile(file);

if(NULL == sdl_surface)

{

// Either the file doesn't exist or ImageIO doesn't understand the format.

// For the latter case, fallback to the native SDL_image handlers.

SDL_RWops *src = SDL_RWFromFile(file, "rb");

char *ext = strrchr(file, '.');

if (ext) {

ext++;

}

if (!src) {

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

return NULL;

}

sdl_surface = IMG_LoadTyped_RW(src, 1, ext);

}

return sdl_surface;

}

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