IMG_ImageIO.m
author Sam Lantinga <slouken@libsdl.org>
Sat, 31 Dec 2011 12:38:49 -0500
changeset 283 ec183abd5996
parent 279 e2fa9ff13b5d
child 292 5953114c0d27
permissions -rw-r--r--
Fixed bug 1236 - CreateCGImageSourceFromRWops leaks

Mike 2011-06-24 00:41:23 PDT

CGDataProviderRef must be cleaned after usage.

Here is a proposed patch
slouken@187
     1
/*
slouken@187
     2
 *  IMG_ImageIO.c
slouken@187
     3
 *  SDL_image
slouken@187
     4
 *
slouken@187
     5
 *  Created by Eric Wing on 1/1/09.
slouken@187
     6
 *  Copyright 2009 __MyCompanyName__. All rights reserved.
slouken@187
     7
 *
slouken@187
     8
 */
slouken@240
     9
slouken@240
    10
#if defined(__APPLE__) && !defined(SDL_IMAGE_USE_COMMON_BACKEND)
slouken@240
    11
slouken@187
    12
#include "SDL_image.h"
slouken@187
    13
ewing@270
    14
// Used because CGDataProviderCreate became deprecated in 10.5
ewing@270
    15
#include <AvailabilityMacros.h>
ewing@270
    16
#include <TargetConditionals.h>
slouken@279
    17
#include <Foundation/Foundation.h>
ewing@270
    18
ewing@270
    19
#if (TARGET_OS_IPHONE == 1) || (TARGET_IPHONE_SIMULATOR == 1)
slouken@279
    20
#ifdef ALLOW_UIIMAGE_FALLBACK
slouken@279
    21
#define USE_UIIMAGE_BACKEND() ([UIImage instancesRespondToSelector:@selector(initWithCGImage:scale:orientation:)] == NO)
slouken@279
    22
#else
slouken@279
    23
#define USE_UIIMAGE_BACKEND() (Internal_checkImageIOisAvailable())
slouken@279
    24
#endif
ewing@270
    25
#import <MobileCoreServices/MobileCoreServices.h> // for UTCoreTypes.h
ewing@270
    26
#import <ImageIO/ImageIO.h>
slouken@279
    27
#import <UIKit/UIImage.h>
ewing@270
    28
#else
slouken@187
    29
// For ImageIO framework and also LaunchServices framework (for UTIs)
slouken@187
    30
#include <ApplicationServices/ApplicationServices.h>
ewing@270
    31
#endif
slouken@187
    32
slouken@187
    33
/**************************************************************
slouken@187
    34
 ***** Begin Callback functions for block reading *************
slouken@187
    35
 **************************************************************/
slouken@187
    36
slouken@187
    37
// This callback reads some bytes from an SDL_rwops and copies it
slouken@187
    38
// to a Quartz buffer (supplied by Apple framework).
slouken@187
    39
static size_t MyProviderGetBytesCallback(void* rwops_userdata, void* quartz_buffer, size_t the_count)
slouken@187
    40
{
slouken@279
    41
    return (size_t)SDL_RWread((struct SDL_RWops *)rwops_userdata, quartz_buffer, 1, the_count);
slouken@187
    42
}
slouken@187
    43
slouken@187
    44
// This callback is triggered when the data provider is released
slouken@187
    45
// so you can clean up any resources.
slouken@187
    46
static void MyProviderReleaseInfoCallback(void* rwops_userdata)
slouken@187
    47
{
slouken@279
    48
    // What should I put here? 
slouken@279
    49
    // I think the user and SDL_RWops controls closing, so I don't do anything.
slouken@187
    50
}
slouken@187
    51
slouken@187
    52
static void MyProviderRewindCallback(void* rwops_userdata)
slouken@187
    53
{
slouken@279
    54
    SDL_RWseek((struct SDL_RWops *)rwops_userdata, 0, RW_SEEK_SET);
slouken@187
    55
}
slouken@187
    56
slouken@200
    57
#if MAC_OS_X_VERSION_MAX_ALLOWED >= 1050 // CGDataProviderCreateSequential was introduced in 10.5; CGDataProviderCreate is deprecated
slouken@200
    58
off_t MyProviderSkipForwardBytesCallback(void* rwops_userdata, off_t the_count)
slouken@200
    59
{
slouken@279
    60
    off_t start_position = SDL_RWtell((struct SDL_RWops *)rwops_userdata);
slouken@279
    61
    SDL_RWseek((struct SDL_RWops *)rwops_userdata, the_count, RW_SEEK_CUR);
slouken@200
    62
    off_t end_position = SDL_RWtell((struct SDL_RWops *)rwops_userdata);
slouken@200
    63
    return (end_position - start_position);	
slouken@200
    64
}
slouken@200
    65
#else // CGDataProviderCreate was deprecated in 10.5
slouken@187
    66
static void MyProviderSkipBytesCallback(void* rwops_userdata, size_t the_count)
slouken@187
    67
{
slouken@279
    68
    SDL_RWseek((struct SDL_RWops *)rwops_userdata, the_count, RW_SEEK_CUR);
slouken@187
    69
}
slouken@200
    70
#endif
slouken@200
    71
slouken@187
    72
/**************************************************************
slouken@187
    73
 ***** End Callback functions for block reading ***************
slouken@187
    74
 **************************************************************/
slouken@187
    75
slouken@187
    76
// This creates a CGImageSourceRef which is a handle to an image that can be used to examine information
slouken@187
    77
// about the image or load the actual image data.
slouken@187
    78
static CGImageSourceRef CreateCGImageSourceFromRWops(SDL_RWops* rw_ops, CFDictionaryRef hints_and_options)
slouken@187
    79
{
slouken@279
    80
    CGImageSourceRef source_ref;
slouken@279
    81
    
slouken@279
    82
    // Similar to SDL_RWops, Apple has their own callbacks for dealing with data streams.
slouken@279
    83
    
slouken@200
    84
#if MAC_OS_X_VERSION_MAX_ALLOWED >= 1050 // CGDataProviderCreateSequential was introduced in 10.5; CGDataProviderCreate is deprecated
slouken@279
    85
    CGDataProviderSequentialCallbacks provider_callbacks =
slouken@279
    86
    {
slouken@200
    87
        0,
slouken@279
    88
        MyProviderGetBytesCallback,
slouken@279
    89
        MyProviderSkipForwardBytesCallback,
slouken@279
    90
        MyProviderRewindCallback,
slouken@279
    91
        MyProviderReleaseInfoCallback
slouken@279
    92
    };
slouken@279
    93
    
slouken@279
    94
    CGDataProviderRef data_provider = CGDataProviderCreateSequential(rw_ops, &provider_callbacks);
slouken@279
    95
    
slouken@279
    96
    
slouken@200
    97
#else // CGDataProviderCreate was deprecated in 10.5
slouken@279
    98
    
slouken@279
    99
    CGDataProviderCallbacks provider_callbacks =
slouken@279
   100
    {
slouken@279
   101
        MyProviderGetBytesCallback,
slouken@279
   102
        MyProviderSkipBytesCallback,
slouken@279
   103
        MyProviderRewindCallback,
slouken@279
   104
        MyProviderReleaseInfoCallback
slouken@279
   105
    };
slouken@279
   106
    
slouken@279
   107
    CGDataProviderRef data_provider = CGDataProviderCreate(rw_ops, &provider_callbacks);
slouken@200
   108
#endif
slouken@279
   109
    // Get the CGImageSourceRef.
slouken@279
   110
    // The dictionary can be NULL or contain hints to help ImageIO figure out the image type.
slouken@279
   111
    source_ref = CGImageSourceCreateWithDataProvider(data_provider, hints_and_options);
slouken@283
   112
    CGDataProviderRelease(data_provider);
slouken@279
   113
    return source_ref;
slouken@187
   114
}
slouken@187
   115
slouken@187
   116
/* Create a CGImageSourceRef from a file. */
slouken@187
   117
/* Remember to CFRelease the created source when done. */
slouken@187
   118
static CGImageSourceRef CreateCGImageSourceFromFile(const char* the_path)
slouken@187
   119
{
slouken@187
   120
    CFURLRef the_url = NULL;
slouken@187
   121
    CGImageSourceRef source_ref = NULL;
slouken@279
   122
    CFStringRef cf_string = NULL;
slouken@279
   123
    
slouken@279
   124
    /* Create a CFString from a C string */
slouken@279
   125
    cf_string = CFStringCreateWithCString(NULL, the_path, kCFStringEncodingUTF8);
slouken@279
   126
    if (!cf_string) {
slouken@279
   127
        return NULL;
slouken@279
   128
    }
slouken@279
   129
    
slouken@279
   130
    /* Create a CFURL from a CFString */
slouken@279
   131
    the_url = CFURLCreateWithFileSystemPath(NULL, cf_string, kCFURLPOSIXPathStyle, false);
slouken@279
   132
    
slouken@279
   133
    /* Don't need the CFString any more (error or not) */
slouken@279
   134
    CFRelease(cf_string);
slouken@279
   135
    
slouken@279
   136
    if(!the_url)
slouken@279
   137
    {
slouken@279
   138
        return NULL;
slouken@279
   139
    }
slouken@279
   140
    
slouken@279
   141
    
slouken@187
   142
    source_ref = CGImageSourceCreateWithURL(the_url, NULL);
slouken@279
   143
    /* Don't need the URL any more (error or not) */
slouken@279
   144
    CFRelease(the_url);
slouken@279
   145
    
slouken@279
   146
    return source_ref;
slouken@187
   147
}
slouken@187
   148
slouken@187
   149
static CGImageRef CreateCGImageFromCGImageSource(CGImageSourceRef image_source)
slouken@187
   150
{
slouken@279
   151
    CGImageRef image_ref = NULL;
slouken@279
   152
    
slouken@279
   153
    if(NULL == image_source)
slouken@279
   154
    {
slouken@279
   155
        return NULL;
slouken@279
   156
    }
slouken@279
   157
    
slouken@279
   158
    // Get the first item in the image source (some image formats may
slouken@279
   159
    // contain multiple items).
slouken@279
   160
    image_ref = CGImageSourceCreateImageAtIndex(image_source, 0, NULL);
slouken@279
   161
    if(NULL == image_ref)
slouken@279
   162
    {
slouken@279
   163
        IMG_SetError("CGImageSourceCreateImageAtIndex() failed");
slouken@279
   164
    }
slouken@279
   165
    return image_ref;
slouken@187
   166
}
slouken@187
   167
slouken@187
   168
static CFDictionaryRef CreateHintDictionary(CFStringRef uti_string_hint)
slouken@187
   169
{
slouken@279
   170
    CFDictionaryRef hint_dictionary = NULL;
slouken@279
   171
    
slouken@279
   172
    if(uti_string_hint != NULL)
slouken@279
   173
    {
slouken@279
   174
        // Do a bunch of work to setup a CFDictionary containing the jpeg compression properties.
slouken@279
   175
        CFStringRef the_keys[1];
slouken@279
   176
        CFStringRef the_values[1];
slouken@279
   177
        
slouken@279
   178
        the_keys[0] = kCGImageSourceTypeIdentifierHint;
slouken@279
   179
        the_values[0] = uti_string_hint;
slouken@279
   180
        
slouken@279
   181
        // kCFTypeDictionaryKeyCallBacks or kCFCopyStringDictionaryKeyCallBacks?
slouken@279
   182
        hint_dictionary = CFDictionaryCreate(NULL, (const void**)&the_keys, (const void**)&the_values, 1, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
slouken@279
   183
    }
slouken@279
   184
    return hint_dictionary;
slouken@187
   185
}
slouken@187
   186
slouken@187
   187
slouken@187
   188
// Once we have our image, we need to get it into an SDL_Surface
slouken@187
   189
static SDL_Surface* Create_SDL_Surface_From_CGImage(CGImageRef image_ref)
slouken@187
   190
{
slouken@279
   191
    /* This code is adapted from Apple's Documentation found here:
slouken@279
   192
     * http://developer.apple.com/documentation/GraphicsImaging/Conceptual/OpenGL-MacProgGuide/index.html
slouken@279
   193
     * Listing 9-4††Using a Quartz image as a texture source.
slouken@279
   194
     * Unfortunately, this guide doesn't show what to do about
slouken@279
   195
     * non-RGBA image formats so I'm making the rest up.
slouken@279
   196
     * All this code should be scrutinized.
slouken@279
   197
     */
slouken@279
   198
    
slouken@279
   199
    size_t w = CGImageGetWidth(image_ref);
slouken@279
   200
    size_t h = CGImageGetHeight(image_ref);
slouken@279
   201
    CGRect rect = {{0, 0}, {w, h}};
slouken@279
   202
    
slouken@279
   203
    CGImageAlphaInfo alpha = CGImageGetAlphaInfo(image_ref);
slouken@279
   204
    //size_t bits_per_pixel = CGImageGetBitsPerPixel(image_ref);
slouken@279
   205
    size_t bits_per_component = 8;
slouken@279
   206
    
slouken@279
   207
    SDL_Surface* surface;
slouken@279
   208
    Uint32 Amask;
slouken@279
   209
    Uint32 Rmask;
slouken@279
   210
    Uint32 Gmask;
slouken@279
   211
    Uint32 Bmask;
slouken@279
   212
    
slouken@279
   213
    CGContextRef bitmap_context;
slouken@279
   214
    CGBitmapInfo bitmap_info;
slouken@279
   215
    CGColorSpaceRef color_space = CGColorSpaceCreateDeviceRGB();
slouken@279
   216
    
slouken@279
   217
    if (alpha == kCGImageAlphaNone ||
slouken@279
   218
        alpha == kCGImageAlphaNoneSkipFirst ||
slouken@279
   219
        alpha == kCGImageAlphaNoneSkipLast) {
slouken@279
   220
        bitmap_info = kCGImageAlphaNoneSkipFirst | kCGBitmapByteOrder32Host; /* XRGB */
slouken@279
   221
        Amask = 0x00000000;
slouken@279
   222
    } else {
slouken@279
   223
        /* kCGImageAlphaFirst isn't supported */
slouken@279
   224
        //bitmap_info = kCGImageAlphaFirst | kCGBitmapByteOrder32Host; /* ARGB */
slouken@279
   225
        bitmap_info = kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host; /* ARGB */
slouken@279
   226
        Amask = 0xFF000000;
slouken@279
   227
    }
slouken@279
   228
    
slouken@279
   229
    Rmask = 0x00FF0000;
slouken@279
   230
    Gmask = 0x0000FF00;
slouken@279
   231
    Bmask = 0x000000FF;
slouken@279
   232
    
slouken@279
   233
    surface = SDL_CreateRGBSurface(SDL_SWSURFACE, w, h, 32, Rmask, Gmask, Bmask, Amask);
slouken@279
   234
    if (surface)
slouken@279
   235
    {
slouken@279
   236
        // Sets up a context to be drawn to with surface->pixels as the area to be drawn to
slouken@279
   237
        bitmap_context = CGBitmapContextCreate(
slouken@279
   238
                                               surface->pixels,
slouken@279
   239
                                               surface->w,
slouken@279
   240
                                               surface->h,
slouken@279
   241
                                               bits_per_component,
slouken@279
   242
                                               surface->pitch,
slouken@279
   243
                                               color_space,
slouken@279
   244
                                               bitmap_info
slouken@279
   245
                                               );
slouken@279
   246
        
slouken@279
   247
        // Draws the image into the context's image_data
slouken@279
   248
        CGContextDrawImage(bitmap_context, rect, image_ref);
slouken@279
   249
        
slouken@279
   250
        CGContextRelease(bitmap_context);
slouken@279
   251
        
slouken@279
   252
        // FIXME: Reverse the premultiplied alpha
slouken@279
   253
        if ((bitmap_info & kCGBitmapAlphaInfoMask) == kCGImageAlphaPremultipliedFirst) {
slouken@279
   254
            int i, j;
slouken@279
   255
            Uint8 *p = (Uint8 *)surface->pixels;
slouken@279
   256
            for (i = surface->h * surface->pitch/4; i--; ) {
slouken@240
   257
#if __LITTLE_ENDIAN__
slouken@279
   258
                Uint8 A = p[3];
slouken@279
   259
                if (A) {
slouken@279
   260
                    for (j = 0; j < 3; ++j) {
slouken@279
   261
                        p[j] = (p[j] * 255) / A;
slouken@279
   262
                    }
slouken@279
   263
                }
slouken@240
   264
#else
slouken@279
   265
                Uint8 A = p[0];
slouken@279
   266
                if (A) {
slouken@279
   267
                    for (j = 1; j < 4; ++j) {
slouken@279
   268
                        p[j] = (p[j] * 255) / A;
slouken@279
   269
                    }
slouken@279
   270
                }
slouken@240
   271
#endif /* ENDIAN */
slouken@279
   272
                p += 4;
slouken@279
   273
            }
slouken@279
   274
        }
slouken@279
   275
    }
slouken@279
   276
    
slouken@279
   277
    if (color_space)
slouken@279
   278
    {
slouken@279
   279
        CGColorSpaceRelease(color_space);			
slouken@279
   280
    }
slouken@279
   281
    
slouken@279
   282
    return surface;
slouken@187
   283
}
slouken@187
   284
slouken@187
   285
slouken@279
   286
#pragma mark -
slouken@279
   287
#pragma mark IMG_Init stubs
slouken@279
   288
#if !defined(ALLOW_UIIMAGE_FALLBACK) && ((TARGET_OS_IPHONE == 1) || (TARGET_IPHONE_SIMULATOR == 1))
slouken@279
   289
static int Internal_checkImageIOisAvailable() {
slouken@279
   290
    // just check if we are running on ios 4 or more, else throw exception
slouken@279
   291
    if ([UIImage instancesRespondToSelector:@selector(initWithCGImage:scale:orientation:)])
slouken@279
   292
        return 0;
slouken@279
   293
    [NSException raise:@"UIImage fallback not enabled at compile time"
slouken@279
   294
                format:@"ImageIO is not available on your platform, please recompile SDL_Image with ALLOW_UIIMAGE_FALLBACK."];
slouken@279
   295
    return -1;
slouken@187
   296
}
slouken@279
   297
#endif
slouken@188
   298
slouken@233
   299
int IMG_InitJPG()
slouken@233
   300
{
slouken@279
   301
    return 0;
slouken@233
   302
}
slouken@233
   303
slouken@233
   304
void IMG_QuitJPG()
slouken@233
   305
{
slouken@233
   306
}
slouken@233
   307
slouken@233
   308
int IMG_InitPNG()
slouken@233
   309
{
slouken@279
   310
    return 0;
slouken@233
   311
}
slouken@233
   312
slouken@233
   313
void IMG_QuitPNG()
slouken@233
   314
{
slouken@233
   315
}
slouken@233
   316
slouken@233
   317
int IMG_InitTIF()
slouken@233
   318
{
slouken@279
   319
    return 0;
slouken@233
   320
}
slouken@233
   321
slouken@233
   322
void IMG_QuitTIF()
slouken@233
   323
{
slouken@233
   324
}
slouken@188
   325
slouken@279
   326
#pragma mark -
slouken@279
   327
#pragma mark Get type of image
slouken@279
   328
static int Internal_isType_UIImage (SDL_RWops *rw_ops, CFStringRef uti_string_to_test)
slouken@279
   329
{
slouken@279
   330
    int is_type = 0;
slouken@279
   331
    
slouken@279
   332
#if defined(ALLOW_UIIMAGE_FALLBACK) && ((TARGET_OS_IPHONE == 1) || (TARGET_IPHONE_SIMULATOR == 1))
slouken@279
   333
    int start = SDL_RWtell(rw_ops);
slouken@279
   334
    if ((0 == CFStringCompare(uti_string_to_test, kUTTypeICO, 0)) ||
slouken@279
   335
        (0 == CFStringCompare(uti_string_to_test, CFSTR("com.microsoft.cur"), 0))) {
slouken@279
   336
        
slouken@279
   337
        // The Win32 ICO file header (14 bytes)
slouken@279
   338
        Uint16 bfReserved;
slouken@279
   339
        Uint16 bfType;
slouken@279
   340
        Uint16 bfCount;
slouken@279
   341
        int type = (0 == CFStringCompare(uti_string_to_test, kUTTypeICO, 0)) ? 1 : 2;
slouken@279
   342
        
slouken@279
   343
        bfReserved = SDL_ReadLE16(rw_ops);
slouken@279
   344
        bfType = SDL_ReadLE16(rw_ops);
slouken@279
   345
        bfCount = SDL_ReadLE16(rw_ops);
slouken@279
   346
        if ((bfReserved == 0) && (bfType == type) && (bfCount != 0)) 
slouken@279
   347
            is_type = 1;
slouken@279
   348
    } else if (0 == CFStringCompare(uti_string_to_test, kUTTypeBMP, 0)) {
slouken@279
   349
        char magic[2];
slouken@279
   350
        
slouken@279
   351
        if ( SDL_RWread(rw_ops, magic, sizeof(magic), 1) ) {
slouken@279
   352
            if ( strncmp(magic, "BM", 2) == 0 ) {
slouken@279
   353
                is_type = 1;
slouken@279
   354
            }
slouken@279
   355
        }
slouken@279
   356
    } else if (0 == CFStringCompare(uti_string_to_test, kUTTypeGIF, 0)) {
slouken@279
   357
        char magic[6];
slouken@279
   358
        
slouken@279
   359
        if ( SDL_RWread(rw_ops, magic, sizeof(magic), 1) ) {
slouken@279
   360
            if ( (strncmp(magic, "GIF", 3) == 0) &&
slouken@279
   361
                ((memcmp(magic + 3, "87a", 3) == 0) ||
slouken@279
   362
                 (memcmp(magic + 3, "89a", 3) == 0)) ) {
slouken@279
   363
                    is_type = 1;
slouken@279
   364
                }
slouken@279
   365
        }
slouken@279
   366
    } else if (0 == CFStringCompare(uti_string_to_test, kUTTypeJPEG, 0)) {
slouken@279
   367
        int in_scan = 0;
slouken@279
   368
        Uint8 magic[4];
slouken@279
   369
        
slouken@279
   370
        // This detection code is by Steaphan Greene <stea@cs.binghamton.edu>
slouken@279
   371
        // Blame me, not Sam, if this doesn't work right. */
slouken@279
   372
        // And don't forget to report the problem to the the sdl list too! */
slouken@279
   373
        
slouken@279
   374
        if ( SDL_RWread(rw_ops, magic, 2, 1) ) {
slouken@279
   375
            if ( (magic[0] == 0xFF) && (magic[1] == 0xD8) ) {
slouken@279
   376
                is_type = 1;
slouken@279
   377
                while (is_type == 1) {
slouken@279
   378
                    if(SDL_RWread(rw_ops, magic, 1, 2) != 2) {
slouken@279
   379
                        is_type = 0;
slouken@279
   380
                    } else if( (magic[0] != 0xFF) && (in_scan == 0) ) {
slouken@279
   381
                        is_type = 0;
slouken@279
   382
                    } else if( (magic[0] != 0xFF) || (magic[1] == 0xFF) ) {
slouken@279
   383
                        /* Extra padding in JPEG (legal) */
slouken@279
   384
                        /* or this is data and we are scanning */
slouken@279
   385
                        SDL_RWseek(rw_ops, -1, SEEK_CUR);
slouken@279
   386
                    } else if(magic[1] == 0xD9) {
slouken@279
   387
                        /* Got to end of good JPEG */
slouken@279
   388
                        break;
slouken@279
   389
                    } else if( (in_scan == 1) && (magic[1] == 0x00) ) {
slouken@279
   390
                        /* This is an encoded 0xFF within the data */
slouken@279
   391
                    } else if( (magic[1] >= 0xD0) && (magic[1] < 0xD9) ) {
slouken@279
   392
                        /* These have nothing else */
slouken@279
   393
                    } else if(SDL_RWread(rw_ops, magic+2, 1, 2) != 2) {
slouken@279
   394
                        is_type = 0;
slouken@279
   395
                    } else {
slouken@279
   396
                        /* Yes, it's big-endian */
slouken@279
   397
                        Uint32 start;
slouken@279
   398
                        Uint32 size;
slouken@279
   399
                        Uint32 end;
slouken@279
   400
                        start = SDL_RWtell(rw_ops);
slouken@279
   401
                        size = (magic[2] << 8) + magic[3];
slouken@279
   402
                        end = SDL_RWseek(rw_ops, size-2, SEEK_CUR);
slouken@279
   403
                        if ( end != start + size - 2 ) is_type = 0;
slouken@279
   404
                        if ( magic[1] == 0xDA ) {
slouken@279
   405
                            /* Now comes the actual JPEG meat */
slouken@279
   406
#ifdef	FAST_IS_JPEG
slouken@279
   407
                            /* Ok, I'm convinced.  It is a JPEG. */
slouken@279
   408
                            break;
slouken@279
   409
#else
slouken@279
   410
                            /* I'm not convinced.  Prove it! */
slouken@279
   411
                            in_scan = 1;
slouken@279
   412
#endif
slouken@279
   413
                        }
slouken@279
   414
                    }
slouken@279
   415
                }
slouken@279
   416
            }
slouken@279
   417
        }
slouken@279
   418
    } else if (0 == CFStringCompare(uti_string_to_test, kUTTypePNG, 0)) {
slouken@279
   419
        Uint8 magic[4];
slouken@279
   420
        
slouken@279
   421
        if ( SDL_RWread(rw_ops, magic, 1, sizeof(magic)) == sizeof(magic) ) {
slouken@279
   422
            if ( magic[0] == 0x89 &&
slouken@279
   423
                magic[1] == 'P' &&
slouken@279
   424
                magic[2] == 'N' &&
slouken@279
   425
                magic[3] == 'G' ) {
slouken@279
   426
                is_type = 1;
slouken@279
   427
            }
slouken@279
   428
        }
slouken@279
   429
    } else if (0 == CFStringCompare(uti_string_to_test, CFSTR("com.truevision.tga-image"), 0)) {
slouken@279
   430
        //TODO: fill me!
slouken@279
   431
    } else if (0 == CFStringCompare(uti_string_to_test, kUTTypeTIFF, 0)) {
slouken@279
   432
        Uint8 magic[4];
slouken@279
   433
        
slouken@279
   434
        if ( SDL_RWread(rw_ops, magic, 1, sizeof(magic)) == sizeof(magic) ) {
slouken@279
   435
            if ( (magic[0] == 'I' &&
slouken@279
   436
                  magic[1] == 'I' &&
slouken@279
   437
                  magic[2] == 0x2a &&
slouken@279
   438
                  magic[3] == 0x00) ||
slouken@279
   439
                (magic[0] == 'M' &&
slouken@279
   440
                 magic[1] == 'M' &&
slouken@279
   441
                 magic[2] == 0x00 &&
slouken@279
   442
                 magic[3] == 0x2a) ) {
slouken@279
   443
                    is_type = 1;
slouken@279
   444
                }
slouken@279
   445
        }
slouken@279
   446
    }
slouken@279
   447
    
slouken@279
   448
    // reset the file descption pointer
slouken@279
   449
    SDL_RWseek(rw_ops, start, SEEK_SET);
slouken@279
   450
slouken@279
   451
#endif  /* #if defined(ALLOW_UIIMAGE_FALLBACK) && ((TARGET_OS_IPHONE == 1) || (TARGET_IPHONE_SIMULATOR == 1)) */
slouken@279
   452
    return is_type;
slouken@279
   453
}
slouken@279
   454
slouken@279
   455
static int Internal_isType_ImageIO (SDL_RWops *rw_ops, CFStringRef uti_string_to_test)
slouken@279
   456
{
slouken@279
   457
    int is_type = 0;
slouken@279
   458
    
slouken@279
   459
    CFDictionaryRef hint_dictionary = CreateHintDictionary(uti_string_to_test);	
slouken@279
   460
    CGImageSourceRef image_source = CreateCGImageSourceFromRWops(rw_ops, hint_dictionary);
slouken@279
   461
    
slouken@279
   462
    if (hint_dictionary != NULL) {
slouken@279
   463
        CFRelease(hint_dictionary);		
slouken@279
   464
    }
slouken@279
   465
    
slouken@279
   466
    if (NULL == image_source) {
slouken@279
   467
        return 0;
slouken@279
   468
    }
slouken@279
   469
    
slouken@279
   470
    // This will get the UTI of the container, not the image itself.
slouken@279
   471
    // Under most cases, this won't be a problem.
slouken@279
   472
    // But if a person passes an icon file which contains a bmp,
slouken@279
   473
    // the format will be of the icon file.
slouken@279
   474
    // But I think the main SDL_image codebase has this same problem so I'm not going to worry about it.	
slouken@279
   475
    CFStringRef uti_type = CGImageSourceGetType(image_source);
slouken@279
   476
    //	CFShow(uti_type);
slouken@279
   477
    
slouken@279
   478
    // Unsure if we really want conformance or equality
slouken@279
   479
    is_type = (int)UTTypeConformsTo(uti_string_to_test, uti_type);
slouken@279
   480
    
slouken@279
   481
    CFRelease(image_source);
slouken@279
   482
    return is_type;
slouken@279
   483
}
slouken@279
   484
slouken@279
   485
static int Internal_isType (SDL_RWops *rw_ops, CFStringRef uti_string_to_test)
slouken@279
   486
{
slouken@279
   487
    if (rw_ops == NULL)
slouken@279
   488
        return 0;
slouken@279
   489
    
slouken@279
   490
#if (TARGET_OS_IPHONE == 1) || (TARGET_IPHONE_SIMULATOR == 1)
slouken@279
   491
    if (USE_UIIMAGE_BACKEND())
slouken@279
   492
        return Internal_isType_UIImage(rw_ops, uti_string_to_test);
slouken@279
   493
    else
slouken@279
   494
#endif
slouken@279
   495
        return Internal_isType_ImageIO(rw_ops, uti_string_to_test);
slouken@279
   496
}
slouken@279
   497
slouken@195
   498
int IMG_isCUR(SDL_RWops *src)
slouken@195
   499
{
slouken@279
   500
    /* FIXME: Is this a supported type? */
slouken@279
   501
    return Internal_isType(src, CFSTR("com.microsoft.cur"));
slouken@195
   502
}
slouken@195
   503
slouken@195
   504
int IMG_isICO(SDL_RWops *src)
slouken@195
   505
{
slouken@279
   506
    return Internal_isType(src, kUTTypeICO);
slouken@195
   507
}
slouken@195
   508
slouken@187
   509
int IMG_isBMP(SDL_RWops *src)
slouken@187
   510
{
slouken@279
   511
    return Internal_isType(src, kUTTypeBMP);
slouken@187
   512
}
slouken@187
   513
slouken@187
   514
int IMG_isGIF(SDL_RWops *src)
slouken@187
   515
{
slouken@279
   516
    return Internal_isType(src, kUTTypeGIF);
slouken@187
   517
}
slouken@195
   518
slouken@187
   519
// Note: JPEG 2000 is kUTTypeJPEG2000
slouken@187
   520
int IMG_isJPG(SDL_RWops *src)
slouken@187
   521
{
slouken@279
   522
    return Internal_isType(src, kUTTypeJPEG);
slouken@187
   523
}
slouken@187
   524
slouken@187
   525
int IMG_isPNG(SDL_RWops *src)
slouken@187
   526
{
slouken@279
   527
    return Internal_isType(src, kUTTypePNG);
slouken@187
   528
}
slouken@187
   529
slouken@187
   530
// This isn't a public API function. Apple seems to be able to identify tga's.
slouken@187
   531
int IMG_isTGA(SDL_RWops *src)
slouken@187
   532
{
slouken@279
   533
    return Internal_isType(src, CFSTR("com.truevision.tga-image"));
slouken@187
   534
}
slouken@187
   535
slouken@187
   536
int IMG_isTIF(SDL_RWops *src)
slouken@187
   537
{
slouken@279
   538
    return Internal_isType(src, kUTTypeTIFF);
slouken@187
   539
}
slouken@187
   540
slouken@279
   541
#pragma mark -
slouken@279
   542
#pragma mark Load image engine
slouken@279
   543
static SDL_Surface *LoadImageFromRWops_UIImage (SDL_RWops* rw_ops, CFStringRef uti_string_hint)
slouken@195
   544
{
slouken@279
   545
    SDL_Surface *sdl_surface = NULL;
slouken@279
   546
slouken@279
   547
#if defined(ALLOW_UIIMAGE_FALLBACK) && ((TARGET_OS_IPHONE == 1) || (TARGET_IPHONE_SIMULATOR == 1))
slouken@279
   548
    NSAutoreleasePool* autorelease_pool = [[NSAutoreleasePool alloc] init];
slouken@279
   549
    UIImage *ui_image;
slouken@279
   550
    int bytes_read = 0;
slouken@279
   551
    // I don't know what a good size is. 
slouken@279
   552
    // Max recommended texture size is 1024x1024 on iPhone so maybe base it on that?
slouken@279
   553
    const int block_size = 1024*4;
slouken@279
   554
    char temp_buffer[block_size];
slouken@279
   555
    
slouken@279
   556
    NSMutableData* ns_data = [[NSMutableData alloc] initWithCapacity:1024*1024*4];
slouken@279
   557
    do {
slouken@279
   558
        bytes_read = SDL_RWread(rw_ops, temp_buffer, 1, block_size);
slouken@279
   559
        [ns_data appendBytes:temp_buffer length:bytes_read];
slouken@279
   560
    } while (bytes_read > 0);
slouken@279
   561
    
slouken@279
   562
    ui_image = [[UIImage alloc] initWithData:ns_data];
slouken@279
   563
    if (ui_image != nil)
slouken@279
   564
        sdl_surface = Create_SDL_Surface_From_CGImage([ui_image CGImage]);
slouken@279
   565
    [ui_image release];
slouken@279
   566
    [ns_data release];          
slouken@279
   567
    [autorelease_pool drain];
slouken@279
   568
slouken@279
   569
#endif  /* #if defined(ALLOW_UIIMAGE_FALLBACK) && ((TARGET_OS_IPHONE == 1) || (TARGET_IPHONE_SIMULATOR == 1)) */
slouken@279
   570
    return sdl_surface;
slouken@187
   571
}
slouken@187
   572
slouken@279
   573
static SDL_Surface *LoadImageFromRWops_ImageIO (SDL_RWops *rw_ops, CFStringRef uti_string_hint)
slouken@279
   574
{
slouken@279
   575
    CFDictionaryRef hint_dictionary = CreateHintDictionary(uti_string_hint);
slouken@279
   576
    CGImageSourceRef image_source = CreateCGImageSourceFromRWops(rw_ops, hint_dictionary);
slouken@279
   577
slouken@279
   578
    if (hint_dictionary != NULL)
slouken@279
   579
        CFRelease(hint_dictionary);		
slouken@279
   580
slouken@279
   581
    if (NULL == image_source)
slouken@279
   582
        return NULL;
slouken@279
   583
    
slouken@279
   584
    CGImageRef image_ref = CreateCGImageFromCGImageSource(image_source);
slouken@279
   585
    CFRelease(image_source);
slouken@279
   586
slouken@279
   587
    if (NULL == image_ref)
slouken@279
   588
        return NULL;
slouken@279
   589
    SDL_Surface *sdl_surface = Create_SDL_Surface_From_CGImage(image_ref);
slouken@279
   590
    CFRelease(image_ref);
slouken@279
   591
slouken@279
   592
    return sdl_surface;
slouken@279
   593
}
slouken@279
   594
slouken@279
   595
static SDL_Surface *LoadImageFromRWops (SDL_RWops *rw_ops, CFStringRef uti_string_hint)
slouken@279
   596
{
slouken@279
   597
#if (TARGET_OS_IPHONE == 1) || (TARGET_IPHONE_SIMULATOR == 1)
slouken@279
   598
    if (USE_UIIMAGE_BACKEND()) 
slouken@279
   599
        return LoadImageFromRWops_UIImage(rw_ops, uti_string_hint);
slouken@279
   600
    else
slouken@279
   601
#endif
slouken@279
   602
        return LoadImageFromRWops_ImageIO(rw_ops, uti_string_hint);
slouken@279
   603
}
slouken@279
   604
slouken@279
   605
static SDL_Surface* LoadImageFromFile_UIImage (const char *file)
slouken@279
   606
{
slouken@279
   607
    SDL_Surface *sdl_surface = NULL;
slouken@279
   608
slouken@279
   609
#if defined(ALLOW_UIIMAGE_FALLBACK) && ((TARGET_OS_IPHONE == 1) || (TARGET_IPHONE_SIMULATOR == 1))
slouken@279
   610
    NSAutoreleasePool* autorelease_pool = [[NSAutoreleasePool alloc] init];
slouken@279
   611
    NSString *ns_string = [[NSString alloc] initWithUTF8String:file];
slouken@279
   612
    UIImage *ui_image = [[UIImage alloc] initWithContentsOfFile:ns_string];
slouken@279
   613
    if (ui_image != nil)
slouken@279
   614
        sdl_surface = Create_SDL_Surface_From_CGImage([ui_image CGImage]);
slouken@279
   615
    [ui_image release];
slouken@279
   616
    [ns_string release];
slouken@279
   617
    [autorelease_pool drain];
slouken@279
   618
slouken@279
   619
#endif  /* #if defined(ALLOW_UIIMAGE_FALLBACK) && ((TARGET_OS_IPHONE == 1) || (TARGET_IPHONE_SIMULATOR == 1)) */
slouken@279
   620
    return sdl_surface;	
slouken@279
   621
}
slouken@279
   622
slouken@279
   623
static SDL_Surface* LoadImageFromFile_ImageIO (const char *file)
slouken@279
   624
{
slouken@279
   625
    CGImageSourceRef image_source = NULL;
slouken@279
   626
slouken@279
   627
    image_source = CreateCGImageSourceFromFile(file);
slouken@279
   628
slouken@279
   629
    if(NULL == image_source)
slouken@279
   630
        return NULL;
slouken@279
   631
    
slouken@279
   632
    CGImageRef image_ref = CreateCGImageFromCGImageSource(image_source);
slouken@279
   633
    CFRelease(image_source);
slouken@279
   634
slouken@279
   635
    if (NULL == image_ref)
slouken@279
   636
        return NULL;
slouken@279
   637
    SDL_Surface *sdl_surface = Create_SDL_Surface_From_CGImage(image_ref);
slouken@279
   638
    CFRelease(image_ref);
slouken@279
   639
    return sdl_surface;	
slouken@279
   640
}
slouken@279
   641
slouken@279
   642
static SDL_Surface* LoadImageFromFile (const char *file)
slouken@279
   643
{
slouken@279
   644
#if (TARGET_OS_IPHONE == 1) || (TARGET_IPHONE_SIMULATOR == 1)
slouken@279
   645
    if (USE_UIIMAGE_BACKEND())
slouken@279
   646
        return LoadImageFromFile_UIImage(file);
slouken@279
   647
    else
slouken@279
   648
#endif
slouken@279
   649
        return LoadImageFromFile_ImageIO(file);
slouken@279
   650
}
slouken@279
   651
slouken@279
   652
SDL_Surface* IMG_LoadCUR_RW (SDL_RWops *src)
slouken@279
   653
{
slouken@279
   654
    /* FIXME: Is this a supported type? */
slouken@279
   655
    return LoadImageFromRWops(src, CFSTR("com.microsoft.cur"));
slouken@279
   656
}
slouken@279
   657
slouken@279
   658
SDL_Surface* IMG_LoadICO_RW (SDL_RWops *src)
slouken@279
   659
{
slouken@279
   660
    return LoadImageFromRWops(src, kUTTypeICO);
slouken@279
   661
}
slouken@279
   662
slouken@279
   663
SDL_Surface* IMG_LoadBMP_RW (SDL_RWops *src)
slouken@279
   664
{
slouken@279
   665
    return LoadImageFromRWops(src, kUTTypeBMP);
slouken@279
   666
}
slouken@279
   667
slouken@279
   668
SDL_Surface* IMG_LoadGIF_RW (SDL_RWops *src)
slouken@279
   669
{
slouken@279
   670
    return LoadImageFromRWops (src, kUTTypeGIF);
slouken@279
   671
}
slouken@279
   672
slouken@279
   673
SDL_Surface* IMG_LoadJPG_RW (SDL_RWops *src)
slouken@279
   674
{
slouken@279
   675
    return LoadImageFromRWops (src, kUTTypeJPEG);
slouken@279
   676
}
slouken@279
   677
slouken@279
   678
SDL_Surface* IMG_LoadPNG_RW (SDL_RWops *src)
slouken@279
   679
{
slouken@279
   680
    return LoadImageFromRWops (src, kUTTypePNG);
slouken@279
   681
}
slouken@279
   682
slouken@279
   683
SDL_Surface* IMG_LoadTGA_RW (SDL_RWops *src)
slouken@279
   684
{
slouken@279
   685
    return LoadImageFromRWops(src, CFSTR("com.truevision.tga-image"));
slouken@279
   686
}
slouken@279
   687
slouken@279
   688
SDL_Surface* IMG_LoadTIF_RW (SDL_RWops *src)
slouken@279
   689
{
slouken@279
   690
    return LoadImageFromRWops(src, kUTTypeTIFF);
slouken@279
   691
}
slouken@279
   692
slouken@279
   693
// Since UIImage doesn't really support streams well, we should optimize for the file case.
slouken@187
   694
// Apple provides both stream and file loading functions in ImageIO.
slouken@187
   695
// Potentially, Apple can optimize for either case.
slouken@279
   696
SDL_Surface* IMG_Load (const char *file)
slouken@187
   697
{
slouken@279
   698
    SDL_Surface* sdl_surface = NULL;
slouken@279
   699
    
slouken@279
   700
    sdl_surface = LoadImageFromFile(file);
slouken@279
   701
    if(NULL == sdl_surface)
slouken@279
   702
    {
slouken@279
   703
        // Either the file doesn't exist or ImageIO doesn't understand the format.
slouken@279
   704
        // For the latter case, fallback to the native SDL_image handlers.
slouken@279
   705
        SDL_RWops *src = SDL_RWFromFile(file, "rb");
slouken@279
   706
        char *ext = strrchr(file, '.');
slouken@279
   707
        if (ext) {
slouken@279
   708
            ext++;
slouken@279
   709
        }
slouken@279
   710
        if (!src) {
slouken@279
   711
            /* The error message has been set in SDL_RWFromFile */
slouken@279
   712
            return NULL;
slouken@279
   713
        }
slouken@279
   714
        sdl_surface = IMG_LoadTyped_RW(src, 1, ext);
slouken@279
   715
    }
slouken@279
   716
    return sdl_surface;
slouken@187
   717
}
slouken@187
   718
slouken@240
   719
#endif /* defined(__APPLE__) && !defined(SDL_IMAGE_USE_COMMON_BACKEND) */