IMG_ImageIO.m
author Ryan C. Gordon <icculus@icculus.org>
Wed, 26 Sep 2018 15:19:34 -0400
changeset 587 32a18ca05935
parent 550 b5bcb9cb9f6d
permissions -rw-r--r--
pnm: Don't get into infinite loops on truncated files.
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@368
    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@368
    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@368
    81
slouken@279
    82
    // Similar to SDL_RWops, Apple has their own callbacks for dealing with data streams.
slouken@368
    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@368
    93
slouken@279
    94
    CGDataProviderRef data_provider = CGDataProviderCreateSequential(rw_ops, &provider_callbacks);
slouken@368
    95
slouken@368
    96
slouken@200
    97
#else // CGDataProviderCreate was deprecated in 10.5
slouken@368
    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@368
   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@368
   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@368
   129
slouken@279
   130
    /* Create a CFURL from a CFString */
slouken@279
   131
    the_url = CFURLCreateWithFileSystemPath(NULL, cf_string, kCFURLPOSIXPathStyle, false);
slouken@368
   132
slouken@279
   133
    /* Don't need the CFString any more (error or not) */
slouken@279
   134
    CFRelease(cf_string);
slouken@368
   135
slouken@279
   136
    if(!the_url)
slouken@279
   137
    {
slouken@279
   138
        return NULL;
slouken@279
   139
    }
slouken@368
   140
slouken@368
   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@368
   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@368
   152
slouken@279
   153
    if(NULL == image_source)
slouken@279
   154
    {
slouken@279
   155
        return NULL;
slouken@279
   156
    }
slouken@368
   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@368
   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@368
   177
slouken@279
   178
        the_keys[0] = kCGImageSourceTypeIdentifierHint;
slouken@279
   179
        the_values[0] = uti_string_hint;
slouken@368
   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
// Once we have our image, we need to get it into an SDL_Surface
slouken@308
   188
static SDL_Surface* Create_SDL_Surface_From_CGImage_RGB(CGImageRef image_ref)
slouken@187
   189
{
slouken@279
   190
    /* This code is adapted from Apple's Documentation found here:
slouken@279
   191
     * http://developer.apple.com/documentation/GraphicsImaging/Conceptual/OpenGL-MacProgGuide/index.html
slouken@279
   192
     * Listing 9-4††Using a Quartz image as a texture source.
slouken@279
   193
     * Unfortunately, this guide doesn't show what to do about
slouken@279
   194
     * non-RGBA image formats so I'm making the rest up.
slouken@279
   195
     * All this code should be scrutinized.
slouken@279
   196
     */
slouken@368
   197
slouken@279
   198
    size_t w = CGImageGetWidth(image_ref);
slouken@279
   199
    size_t h = CGImageGetHeight(image_ref);
slouken@279
   200
    CGRect rect = {{0, 0}, {w, h}};
slouken@368
   201
slouken@279
   202
    CGImageAlphaInfo alpha = CGImageGetAlphaInfo(image_ref);
slouken@279
   203
    //size_t bits_per_pixel = CGImageGetBitsPerPixel(image_ref);
slouken@279
   204
    size_t bits_per_component = 8;
slouken@368
   205
slouken@279
   206
    SDL_Surface* surface;
slouken@279
   207
    Uint32 Amask;
slouken@279
   208
    Uint32 Rmask;
slouken@279
   209
    Uint32 Gmask;
slouken@279
   210
    Uint32 Bmask;
slouken@368
   211
slouken@279
   212
    CGContextRef bitmap_context;
slouken@279
   213
    CGBitmapInfo bitmap_info;
slouken@466
   214
    CGColorSpaceRef color_space = CGColorSpaceCreateDeviceRGB();
slouken@368
   215
slouken@279
   216
    if (alpha == kCGImageAlphaNone ||
slouken@279
   217
        alpha == kCGImageAlphaNoneSkipFirst ||
slouken@279
   218
        alpha == kCGImageAlphaNoneSkipLast) {
slouken@279
   219
        bitmap_info = kCGImageAlphaNoneSkipFirst | kCGBitmapByteOrder32Host; /* XRGB */
slouken@279
   220
        Amask = 0x00000000;
slouken@279
   221
    } else {
slouken@279
   222
        /* kCGImageAlphaFirst isn't supported */
slouken@279
   223
        //bitmap_info = kCGImageAlphaFirst | kCGBitmapByteOrder32Host; /* ARGB */
slouken@279
   224
        bitmap_info = kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host; /* ARGB */
slouken@279
   225
        Amask = 0xFF000000;
slouken@279
   226
    }
slouken@368
   227
slouken@279
   228
    Rmask = 0x00FF0000;
slouken@279
   229
    Gmask = 0x0000FF00;
slouken@279
   230
    Bmask = 0x000000FF;
slouken@368
   231
slouken@550
   232
    surface = SDL_CreateRGBSurface(SDL_SWSURFACE, (int)w, (int)h, 32, Rmask, Gmask, Bmask, Amask);
slouken@279
   233
    if (surface)
slouken@279
   234
    {
slouken@279
   235
        // Sets up a context to be drawn to with surface->pixels as the area to be drawn to
slouken@279
   236
        bitmap_context = CGBitmapContextCreate(
slouken@279
   237
                                               surface->pixels,
slouken@279
   238
                                               surface->w,
slouken@279
   239
                                               surface->h,
slouken@279
   240
                                               bits_per_component,
slouken@279
   241
                                               surface->pitch,
slouken@279
   242
                                               color_space,
slouken@279
   243
                                               bitmap_info
slouken@279
   244
                                               );
slouken@368
   245
slouken@279
   246
        // Draws the image into the context's image_data
slouken@279
   247
        CGContextDrawImage(bitmap_context, rect, image_ref);
slouken@368
   248
slouken@279
   249
        CGContextRelease(bitmap_context);
slouken@368
   250
slouken@279
   251
        // FIXME: Reverse the premultiplied alpha
slouken@279
   252
        if ((bitmap_info & kCGBitmapAlphaInfoMask) == kCGImageAlphaPremultipliedFirst) {
slouken@279
   253
            int i, j;
slouken@279
   254
            Uint8 *p = (Uint8 *)surface->pixels;
slouken@279
   255
            for (i = surface->h * surface->pitch/4; i--; ) {
slouken@240
   256
#if __LITTLE_ENDIAN__
slouken@279
   257
                Uint8 A = p[3];
slouken@279
   258
                if (A) {
slouken@279
   259
                    for (j = 0; j < 3; ++j) {
slouken@279
   260
                        p[j] = (p[j] * 255) / A;
slouken@279
   261
                    }
slouken@279
   262
                }
slouken@240
   263
#else
slouken@279
   264
                Uint8 A = p[0];
slouken@279
   265
                if (A) {
slouken@279
   266
                    for (j = 1; j < 4; ++j) {
slouken@279
   267
                        p[j] = (p[j] * 255) / A;
slouken@279
   268
                    }
slouken@279
   269
                }
slouken@240
   270
#endif /* ENDIAN */
slouken@279
   271
                p += 4;
slouken@279
   272
            }
slouken@279
   273
        }
slouken@279
   274
    }
slouken@368
   275
slouken@279
   276
    if (color_space)
slouken@279
   277
    {
slouken@368
   278
        CGColorSpaceRelease(color_space);
slouken@279
   279
    }
slouken@368
   280
slouken@279
   281
    return surface;
slouken@187
   282
}
slouken@308
   283
static SDL_Surface* Create_SDL_Surface_From_CGImage_Index(CGImageRef image_ref)
slouken@308
   284
{
slouken@308
   285
    size_t w = CGImageGetWidth(image_ref);
slouken@308
   286
    size_t h = CGImageGetHeight(image_ref);
slouken@308
   287
    size_t bits_per_pixel = CGImageGetBitsPerPixel(image_ref);
slouken@308
   288
    size_t bytes_per_row = CGImageGetBytesPerRow(image_ref);
slouken@308
   289
slouken@308
   290
    SDL_Surface* surface;
slouken@308
   291
    SDL_Palette* palette;
slouken@368
   292
    CGColorSpaceRef color_space = CGImageGetColorSpace(image_ref);
slouken@308
   293
    CGColorSpaceRef base_color_space = CGColorSpaceGetBaseColorSpace(color_space);
slouken@308
   294
    size_t num_components = CGColorSpaceGetNumberOfComponents(base_color_space);
slouken@308
   295
    size_t num_entries = CGColorSpaceGetColorTableCount(color_space);
slouken@308
   296
    uint8_t *entry, entries[num_components * num_entries];
slouken@308
   297
slouken@308
   298
    /* What do we do if it's not RGB? */
slouken@308
   299
    if (num_components != 3) {
slouken@308
   300
        SDL_SetError("Unknown colorspace components %lu", num_components);
slouken@308
   301
        return NULL;
slouken@308
   302
    }
slouken@308
   303
    if (bits_per_pixel != 8) {
slouken@308
   304
        SDL_SetError("Unknown bits_per_pixel %lu", bits_per_pixel);
slouken@308
   305
        return NULL;
slouken@308
   306
    }
slouken@308
   307
slouken@308
   308
    CGColorSpaceGetColorTable(color_space, entries);
slouken@550
   309
    surface = SDL_CreateRGBSurface(SDL_SWSURFACE, (int)w, (int)h, bits_per_pixel, 0, 0, 0, 0);
slouken@308
   310
    if (surface) {
slouken@308
   311
        uint8_t* pixels = (uint8_t*)surface->pixels;
slouken@308
   312
        CGDataProviderRef provider = CGImageGetDataProvider(image_ref);
slouken@308
   313
        NSData* data = (id)CGDataProviderCopyData(provider);
slouken@308
   314
        [data autorelease];
slouken@308
   315
        const uint8_t* bytes = [data bytes];
slouken@308
   316
        size_t i;
slouken@308
   317
slouken@308
   318
        palette = surface->format->palette;
slouken@308
   319
        for (i = 0, entry = entries; i < num_entries; ++i) {
slouken@308
   320
            palette->colors[i].r = entry[0];
slouken@308
   321
            palette->colors[i].g = entry[1];
slouken@308
   322
            palette->colors[i].b = entry[2];
slouken@308
   323
            entry += num_components;
slouken@308
   324
        }
slouken@308
   325
slouken@308
   326
        for (i = 0; i < h; ++i) {
slouken@308
   327
            SDL_memcpy(pixels, bytes, w);
slouken@308
   328
            pixels += surface->pitch;
slouken@308
   329
            bytes += bytes_per_row;
slouken@308
   330
        }
slouken@308
   331
    }
slouken@308
   332
    return surface;
slouken@308
   333
}
slouken@308
   334
static SDL_Surface* Create_SDL_Surface_From_CGImage(CGImageRef image_ref)
slouken@308
   335
{
slouken@368
   336
    CGColorSpaceRef color_space = CGImageGetColorSpace(image_ref);
slouken@308
   337
    if (CGColorSpaceGetModel(color_space) == kCGColorSpaceModelIndexed) {
slouken@308
   338
        return Create_SDL_Surface_From_CGImage_Index(image_ref);
slouken@308
   339
    } else {
slouken@308
   340
        return Create_SDL_Surface_From_CGImage_RGB(image_ref);
slouken@308
   341
    }
slouken@308
   342
}
slouken@187
   343
slouken@187
   344
slouken@279
   345
#pragma mark -
slouken@279
   346
#pragma mark IMG_Init stubs
slouken@279
   347
#if !defined(ALLOW_UIIMAGE_FALLBACK) && ((TARGET_OS_IPHONE == 1) || (TARGET_IPHONE_SIMULATOR == 1))
slouken@279
   348
static int Internal_checkImageIOisAvailable() {
slouken@279
   349
    // just check if we are running on ios 4 or more, else throw exception
slouken@279
   350
    if ([UIImage instancesRespondToSelector:@selector(initWithCGImage:scale:orientation:)])
slouken@279
   351
        return 0;
slouken@279
   352
    [NSException raise:@"UIImage fallback not enabled at compile time"
slouken@279
   353
                format:@"ImageIO is not available on your platform, please recompile SDL_Image with ALLOW_UIIMAGE_FALLBACK."];
slouken@279
   354
    return -1;
slouken@187
   355
}
slouken@279
   356
#endif
slouken@188
   357
slouken@233
   358
int IMG_InitJPG()
slouken@233
   359
{
slouken@279
   360
    return 0;
slouken@233
   361
}
slouken@233
   362
slouken@233
   363
void IMG_QuitJPG()
slouken@233
   364
{
slouken@233
   365
}
slouken@233
   366
slouken@233
   367
int IMG_InitPNG()
slouken@233
   368
{
slouken@279
   369
    return 0;
slouken@233
   370
}
slouken@233
   371
slouken@233
   372
void IMG_QuitPNG()
slouken@233
   373
{
slouken@233
   374
}
slouken@233
   375
slouken@233
   376
int IMG_InitTIF()
slouken@233
   377
{
slouken@279
   378
    return 0;
slouken@233
   379
}
slouken@233
   380
slouken@233
   381
void IMG_QuitTIF()
slouken@233
   382
{
slouken@233
   383
}
slouken@188
   384
slouken@279
   385
#pragma mark -
slouken@279
   386
#pragma mark Get type of image
slouken@279
   387
static int Internal_isType_UIImage (SDL_RWops *rw_ops, CFStringRef uti_string_to_test)
slouken@279
   388
{
slouken@279
   389
    int is_type = 0;
slouken@368
   390
slouken@279
   391
#if defined(ALLOW_UIIMAGE_FALLBACK) && ((TARGET_OS_IPHONE == 1) || (TARGET_IPHONE_SIMULATOR == 1))
slouken@530
   392
    Sint64 start = SDL_RWtell(rw_ops);
slouken@279
   393
    if ((0 == CFStringCompare(uti_string_to_test, kUTTypeICO, 0)) ||
slouken@279
   394
        (0 == CFStringCompare(uti_string_to_test, CFSTR("com.microsoft.cur"), 0))) {
slouken@368
   395
slouken@279
   396
        // The Win32 ICO file header (14 bytes)
slouken@279
   397
        Uint16 bfReserved;
slouken@279
   398
        Uint16 bfType;
slouken@279
   399
        Uint16 bfCount;
slouken@279
   400
        int type = (0 == CFStringCompare(uti_string_to_test, kUTTypeICO, 0)) ? 1 : 2;
slouken@368
   401
slouken@279
   402
        bfReserved = SDL_ReadLE16(rw_ops);
slouken@279
   403
        bfType = SDL_ReadLE16(rw_ops);
slouken@279
   404
        bfCount = SDL_ReadLE16(rw_ops);
slouken@368
   405
        if ((bfReserved == 0) && (bfType == type) && (bfCount != 0))
slouken@279
   406
            is_type = 1;
slouken@279
   407
    } else if (0 == CFStringCompare(uti_string_to_test, kUTTypeBMP, 0)) {
slouken@279
   408
        char magic[2];
slouken@368
   409
slouken@279
   410
        if ( SDL_RWread(rw_ops, magic, sizeof(magic), 1) ) {
slouken@279
   411
            if ( strncmp(magic, "BM", 2) == 0 ) {
slouken@279
   412
                is_type = 1;
slouken@279
   413
            }
slouken@279
   414
        }
slouken@279
   415
    } else if (0 == CFStringCompare(uti_string_to_test, kUTTypeGIF, 0)) {
slouken@279
   416
        char magic[6];
slouken@368
   417
slouken@279
   418
        if ( SDL_RWread(rw_ops, magic, sizeof(magic), 1) ) {
slouken@279
   419
            if ( (strncmp(magic, "GIF", 3) == 0) &&
slouken@279
   420
                ((memcmp(magic + 3, "87a", 3) == 0) ||
slouken@279
   421
                 (memcmp(magic + 3, "89a", 3) == 0)) ) {
slouken@279
   422
                    is_type = 1;
slouken@279
   423
                }
slouken@279
   424
        }
slouken@279
   425
    } else if (0 == CFStringCompare(uti_string_to_test, kUTTypeJPEG, 0)) {
slouken@279
   426
        int in_scan = 0;
slouken@279
   427
        Uint8 magic[4];
slouken@368
   428
slouken@279
   429
        // This detection code is by Steaphan Greene <stea@cs.binghamton.edu>
slouken@279
   430
        // Blame me, not Sam, if this doesn't work right. */
slouken@279
   431
        // And don't forget to report the problem to the the sdl list too! */
slouken@368
   432
slouken@279
   433
        if ( SDL_RWread(rw_ops, magic, 2, 1) ) {
slouken@279
   434
            if ( (magic[0] == 0xFF) && (magic[1] == 0xD8) ) {
slouken@279
   435
                is_type = 1;
slouken@279
   436
                while (is_type == 1) {
slouken@279
   437
                    if(SDL_RWread(rw_ops, magic, 1, 2) != 2) {
slouken@279
   438
                        is_type = 0;
slouken@279
   439
                    } else if( (magic[0] != 0xFF) && (in_scan == 0) ) {
slouken@279
   440
                        is_type = 0;
slouken@279
   441
                    } else if( (magic[0] != 0xFF) || (magic[1] == 0xFF) ) {
slouken@279
   442
                        /* Extra padding in JPEG (legal) */
slouken@279
   443
                        /* or this is data and we are scanning */
slouken@279
   444
                        SDL_RWseek(rw_ops, -1, SEEK_CUR);
slouken@279
   445
                    } else if(magic[1] == 0xD9) {
slouken@279
   446
                        /* Got to end of good JPEG */
slouken@279
   447
                        break;
slouken@279
   448
                    } else if( (in_scan == 1) && (magic[1] == 0x00) ) {
slouken@279
   449
                        /* This is an encoded 0xFF within the data */
slouken@279
   450
                    } else if( (magic[1] >= 0xD0) && (magic[1] < 0xD9) ) {
slouken@279
   451
                        /* These have nothing else */
slouken@279
   452
                    } else if(SDL_RWread(rw_ops, magic+2, 1, 2) != 2) {
slouken@279
   453
                        is_type = 0;
slouken@279
   454
                    } else {
slouken@279
   455
                        /* Yes, it's big-endian */
slouken@279
   456
                        Uint32 start;
slouken@279
   457
                        Uint32 size;
slouken@279
   458
                        Uint32 end;
slouken@279
   459
                        start = SDL_RWtell(rw_ops);
slouken@279
   460
                        size = (magic[2] << 8) + magic[3];
slouken@279
   461
                        end = SDL_RWseek(rw_ops, size-2, SEEK_CUR);
slouken@279
   462
                        if ( end != start + size - 2 ) is_type = 0;
slouken@279
   463
                        if ( magic[1] == 0xDA ) {
slouken@279
   464
                            /* Now comes the actual JPEG meat */
slouken@368
   465
#ifdef  FAST_IS_JPEG
slouken@279
   466
                            /* Ok, I'm convinced.  It is a JPEG. */
slouken@279
   467
                            break;
slouken@279
   468
#else
slouken@279
   469
                            /* I'm not convinced.  Prove it! */
slouken@279
   470
                            in_scan = 1;
slouken@279
   471
#endif
slouken@279
   472
                        }
slouken@279
   473
                    }
slouken@279
   474
                }
slouken@279
   475
            }
slouken@279
   476
        }
slouken@279
   477
    } else if (0 == CFStringCompare(uti_string_to_test, kUTTypePNG, 0)) {
slouken@279
   478
        Uint8 magic[4];
slouken@368
   479
slouken@279
   480
        if ( SDL_RWread(rw_ops, magic, 1, sizeof(magic)) == sizeof(magic) ) {
slouken@279
   481
            if ( magic[0] == 0x89 &&
slouken@279
   482
                magic[1] == 'P' &&
slouken@279
   483
                magic[2] == 'N' &&
slouken@279
   484
                magic[3] == 'G' ) {
slouken@279
   485
                is_type = 1;
slouken@279
   486
            }
slouken@279
   487
        }
slouken@279
   488
    } else if (0 == CFStringCompare(uti_string_to_test, CFSTR("com.truevision.tga-image"), 0)) {
slouken@279
   489
        //TODO: fill me!
slouken@279
   490
    } else if (0 == CFStringCompare(uti_string_to_test, kUTTypeTIFF, 0)) {
slouken@279
   491
        Uint8 magic[4];
slouken@368
   492
slouken@279
   493
        if ( SDL_RWread(rw_ops, magic, 1, sizeof(magic)) == sizeof(magic) ) {
slouken@279
   494
            if ( (magic[0] == 'I' &&
slouken@279
   495
                  magic[1] == 'I' &&
slouken@279
   496
                  magic[2] == 0x2a &&
slouken@279
   497
                  magic[3] == 0x00) ||
slouken@279
   498
                (magic[0] == 'M' &&
slouken@279
   499
                 magic[1] == 'M' &&
slouken@279
   500
                 magic[2] == 0x00 &&
slouken@279
   501
                 magic[3] == 0x2a) ) {
slouken@279
   502
                    is_type = 1;
slouken@279
   503
                }
slouken@279
   504
        }
slouken@279
   505
    }
slouken@368
   506
slouken@530
   507
    // reset the file pointer
slouken@279
   508
    SDL_RWseek(rw_ops, start, SEEK_SET);
slouken@279
   509
slouken@279
   510
#endif  /* #if defined(ALLOW_UIIMAGE_FALLBACK) && ((TARGET_OS_IPHONE == 1) || (TARGET_IPHONE_SIMULATOR == 1)) */
slouken@279
   511
    return is_type;
slouken@279
   512
}
slouken@279
   513
slouken@279
   514
static int Internal_isType_ImageIO (SDL_RWops *rw_ops, CFStringRef uti_string_to_test)
slouken@279
   515
{
slouken@279
   516
    int is_type = 0;
slouken@368
   517
slouken@530
   518
    Sint64 start = SDL_RWtell(rw_ops);
slouken@368
   519
    CFDictionaryRef hint_dictionary = CreateHintDictionary(uti_string_to_test);
slouken@279
   520
    CGImageSourceRef image_source = CreateCGImageSourceFromRWops(rw_ops, hint_dictionary);
slouken@368
   521
slouken@279
   522
    if (hint_dictionary != NULL) {
slouken@368
   523
        CFRelease(hint_dictionary);
slouken@279
   524
    }
slouken@368
   525
slouken@279
   526
    if (NULL == image_source) {
slouken@530
   527
        // reset the file pointer
slouken@530
   528
        SDL_RWseek(rw_ops, start, SEEK_SET);
slouken@279
   529
        return 0;
slouken@279
   530
    }
slouken@368
   531
slouken@279
   532
    // This will get the UTI of the container, not the image itself.
slouken@279
   533
    // Under most cases, this won't be a problem.
slouken@279
   534
    // But if a person passes an icon file which contains a bmp,
slouken@279
   535
    // the format will be of the icon file.
slouken@368
   536
    // But I think the main SDL_image codebase has this same problem so I'm not going to worry about it.
slouken@279
   537
    CFStringRef uti_type = CGImageSourceGetType(image_source);
slouken@368
   538
    //  CFShow(uti_type);
slouken@368
   539
slouken@279
   540
    // Unsure if we really want conformance or equality
slouken@279
   541
    is_type = (int)UTTypeConformsTo(uti_string_to_test, uti_type);
slouken@368
   542
slouken@279
   543
    CFRelease(image_source);
slouken@530
   544
slouken@530
   545
    // reset the file pointer
slouken@530
   546
    SDL_RWseek(rw_ops, start, SEEK_SET);
slouken@279
   547
    return is_type;
slouken@279
   548
}
slouken@279
   549
slouken@279
   550
static int Internal_isType (SDL_RWops *rw_ops, CFStringRef uti_string_to_test)
slouken@279
   551
{
slouken@279
   552
    if (rw_ops == NULL)
slouken@279
   553
        return 0;
slouken@368
   554
slouken@279
   555
#if (TARGET_OS_IPHONE == 1) || (TARGET_IPHONE_SIMULATOR == 1)
slouken@279
   556
    if (USE_UIIMAGE_BACKEND())
slouken@279
   557
        return Internal_isType_UIImage(rw_ops, uti_string_to_test);
slouken@279
   558
    else
slouken@279
   559
#endif
slouken@279
   560
        return Internal_isType_ImageIO(rw_ops, uti_string_to_test);
slouken@279
   561
}
slouken@279
   562
slouken@332
   563
#ifdef BMP_USES_IMAGEIO
slouken@332
   564
slouken@195
   565
int IMG_isCUR(SDL_RWops *src)
slouken@195
   566
{
slouken@279
   567
    /* FIXME: Is this a supported type? */
slouken@279
   568
    return Internal_isType(src, CFSTR("com.microsoft.cur"));
slouken@195
   569
}
slouken@195
   570
slouken@195
   571
int IMG_isICO(SDL_RWops *src)
slouken@195
   572
{
slouken@279
   573
    return Internal_isType(src, kUTTypeICO);
slouken@195
   574
}
slouken@195
   575
slouken@187
   576
int IMG_isBMP(SDL_RWops *src)
slouken@187
   577
{
slouken@279
   578
    return Internal_isType(src, kUTTypeBMP);
slouken@187
   579
}
slouken@187
   580
slouken@332
   581
#endif /* BMP_USES_IMAGEIO */
slouken@332
   582
slouken@187
   583
int IMG_isGIF(SDL_RWops *src)
slouken@187
   584
{
slouken@279
   585
    return Internal_isType(src, kUTTypeGIF);
slouken@187
   586
}
slouken@195
   587
slouken@187
   588
// Note: JPEG 2000 is kUTTypeJPEG2000
slouken@187
   589
int IMG_isJPG(SDL_RWops *src)
slouken@187
   590
{
slouken@279
   591
    return Internal_isType(src, kUTTypeJPEG);
slouken@187
   592
}
slouken@187
   593
slouken@187
   594
int IMG_isPNG(SDL_RWops *src)
slouken@187
   595
{
slouken@279
   596
    return Internal_isType(src, kUTTypePNG);
slouken@187
   597
}
slouken@187
   598
slouken@187
   599
// This isn't a public API function. Apple seems to be able to identify tga's.
slouken@187
   600
int IMG_isTGA(SDL_RWops *src)
slouken@187
   601
{
slouken@279
   602
    return Internal_isType(src, CFSTR("com.truevision.tga-image"));
slouken@187
   603
}
slouken@187
   604
slouken@187
   605
int IMG_isTIF(SDL_RWops *src)
slouken@187
   606
{
slouken@279
   607
    return Internal_isType(src, kUTTypeTIFF);
slouken@187
   608
}
slouken@187
   609
slouken@279
   610
#pragma mark -
slouken@279
   611
#pragma mark Load image engine
slouken@279
   612
static SDL_Surface *LoadImageFromRWops_UIImage (SDL_RWops* rw_ops, CFStringRef uti_string_hint)
slouken@195
   613
{
slouken@279
   614
    SDL_Surface *sdl_surface = NULL;
slouken@279
   615
slouken@279
   616
#if defined(ALLOW_UIIMAGE_FALLBACK) && ((TARGET_OS_IPHONE == 1) || (TARGET_IPHONE_SIMULATOR == 1))
slouken@279
   617
    NSAutoreleasePool* autorelease_pool = [[NSAutoreleasePool alloc] init];
slouken@279
   618
    UIImage *ui_image;
slouken@279
   619
    int bytes_read = 0;
slouken@368
   620
    // I don't know what a good size is.
slouken@279
   621
    // Max recommended texture size is 1024x1024 on iPhone so maybe base it on that?
slouken@279
   622
    const int block_size = 1024*4;
slouken@279
   623
    char temp_buffer[block_size];
slouken@368
   624
slouken@279
   625
    NSMutableData* ns_data = [[NSMutableData alloc] initWithCapacity:1024*1024*4];
slouken@279
   626
    do {
slouken@279
   627
        bytes_read = SDL_RWread(rw_ops, temp_buffer, 1, block_size);
slouken@279
   628
        [ns_data appendBytes:temp_buffer length:bytes_read];
slouken@279
   629
    } while (bytes_read > 0);
slouken@368
   630
slouken@279
   631
    ui_image = [[UIImage alloc] initWithData:ns_data];
slouken@279
   632
    if (ui_image != nil)
slouken@279
   633
        sdl_surface = Create_SDL_Surface_From_CGImage([ui_image CGImage]);
slouken@279
   634
    [ui_image release];
slouken@368
   635
    [ns_data release];
slouken@279
   636
    [autorelease_pool drain];
slouken@279
   637
slouken@279
   638
#endif  /* #if defined(ALLOW_UIIMAGE_FALLBACK) && ((TARGET_OS_IPHONE == 1) || (TARGET_IPHONE_SIMULATOR == 1)) */
slouken@279
   639
    return sdl_surface;
slouken@187
   640
}
slouken@187
   641
slouken@279
   642
static SDL_Surface *LoadImageFromRWops_ImageIO (SDL_RWops *rw_ops, CFStringRef uti_string_hint)
slouken@279
   643
{
slouken@279
   644
    CFDictionaryRef hint_dictionary = CreateHintDictionary(uti_string_hint);
slouken@279
   645
    CGImageSourceRef image_source = CreateCGImageSourceFromRWops(rw_ops, hint_dictionary);
slouken@279
   646
slouken@279
   647
    if (hint_dictionary != NULL)
slouken@368
   648
        CFRelease(hint_dictionary);
slouken@279
   649
slouken@279
   650
    if (NULL == image_source)
slouken@279
   651
        return NULL;
slouken@368
   652
slouken@279
   653
    CGImageRef image_ref = CreateCGImageFromCGImageSource(image_source);
slouken@279
   654
    CFRelease(image_source);
slouken@279
   655
slouken@279
   656
    if (NULL == image_ref)
slouken@279
   657
        return NULL;
slouken@279
   658
    SDL_Surface *sdl_surface = Create_SDL_Surface_From_CGImage(image_ref);
slouken@279
   659
    CFRelease(image_ref);
slouken@279
   660
slouken@279
   661
    return sdl_surface;
slouken@279
   662
}
slouken@279
   663
slouken@279
   664
static SDL_Surface *LoadImageFromRWops (SDL_RWops *rw_ops, CFStringRef uti_string_hint)
slouken@279
   665
{
slouken@279
   666
#if (TARGET_OS_IPHONE == 1) || (TARGET_IPHONE_SIMULATOR == 1)
slouken@368
   667
    if (USE_UIIMAGE_BACKEND())
slouken@279
   668
        return LoadImageFromRWops_UIImage(rw_ops, uti_string_hint);
slouken@279
   669
    else
slouken@279
   670
#endif
slouken@279
   671
        return LoadImageFromRWops_ImageIO(rw_ops, uti_string_hint);
slouken@279
   672
}
slouken@279
   673
slouken@279
   674
static SDL_Surface* LoadImageFromFile_UIImage (const char *file)
slouken@279
   675
{
slouken@279
   676
    SDL_Surface *sdl_surface = NULL;
slouken@279
   677
slouken@279
   678
#if defined(ALLOW_UIIMAGE_FALLBACK) && ((TARGET_OS_IPHONE == 1) || (TARGET_IPHONE_SIMULATOR == 1))
slouken@279
   679
    NSAutoreleasePool* autorelease_pool = [[NSAutoreleasePool alloc] init];
slouken@279
   680
    NSString *ns_string = [[NSString alloc] initWithUTF8String:file];
slouken@279
   681
    UIImage *ui_image = [[UIImage alloc] initWithContentsOfFile:ns_string];
slouken@279
   682
    if (ui_image != nil)
slouken@279
   683
        sdl_surface = Create_SDL_Surface_From_CGImage([ui_image CGImage]);
slouken@279
   684
    [ui_image release];
slouken@279
   685
    [ns_string release];
slouken@279
   686
    [autorelease_pool drain];
slouken@279
   687
slouken@279
   688
#endif  /* #if defined(ALLOW_UIIMAGE_FALLBACK) && ((TARGET_OS_IPHONE == 1) || (TARGET_IPHONE_SIMULATOR == 1)) */
slouken@368
   689
    return sdl_surface;
slouken@279
   690
}
slouken@279
   691
slouken@279
   692
static SDL_Surface* LoadImageFromFile_ImageIO (const char *file)
slouken@279
   693
{
slouken@279
   694
    CGImageSourceRef image_source = NULL;
slouken@279
   695
slouken@279
   696
    image_source = CreateCGImageSourceFromFile(file);
slouken@279
   697
slouken@279
   698
    if(NULL == image_source)
slouken@279
   699
        return NULL;
slouken@368
   700
slouken@279
   701
    CGImageRef image_ref = CreateCGImageFromCGImageSource(image_source);
slouken@279
   702
    CFRelease(image_source);
slouken@279
   703
slouken@279
   704
    if (NULL == image_ref)
slouken@279
   705
        return NULL;
slouken@279
   706
    SDL_Surface *sdl_surface = Create_SDL_Surface_From_CGImage(image_ref);
slouken@279
   707
    CFRelease(image_ref);
slouken@368
   708
    return sdl_surface;
slouken@279
   709
}
slouken@279
   710
slouken@279
   711
static SDL_Surface* LoadImageFromFile (const char *file)
slouken@279
   712
{
slouken@279
   713
#if (TARGET_OS_IPHONE == 1) || (TARGET_IPHONE_SIMULATOR == 1)
slouken@279
   714
    if (USE_UIIMAGE_BACKEND())
slouken@279
   715
        return LoadImageFromFile_UIImage(file);
slouken@279
   716
    else
slouken@279
   717
#endif
slouken@279
   718
        return LoadImageFromFile_ImageIO(file);
slouken@279
   719
}
slouken@279
   720
slouken@332
   721
#ifdef BMP_USES_IMAGEIO
slouken@332
   722
slouken@279
   723
SDL_Surface* IMG_LoadCUR_RW (SDL_RWops *src)
slouken@279
   724
{
slouken@279
   725
    /* FIXME: Is this a supported type? */
slouken@279
   726
    return LoadImageFromRWops(src, CFSTR("com.microsoft.cur"));
slouken@279
   727
}
slouken@279
   728
slouken@279
   729
SDL_Surface* IMG_LoadICO_RW (SDL_RWops *src)
slouken@279
   730
{
slouken@279
   731
    return LoadImageFromRWops(src, kUTTypeICO);
slouken@279
   732
}
slouken@279
   733
slouken@279
   734
SDL_Surface* IMG_LoadBMP_RW (SDL_RWops *src)
slouken@279
   735
{
slouken@279
   736
    return LoadImageFromRWops(src, kUTTypeBMP);
slouken@279
   737
}
slouken@279
   738
slouken@332
   739
#endif /* BMP_USES_IMAGEIO */
slouken@332
   740
slouken@279
   741
SDL_Surface* IMG_LoadGIF_RW (SDL_RWops *src)
slouken@279
   742
{
slouken@279
   743
    return LoadImageFromRWops (src, kUTTypeGIF);
slouken@279
   744
}
slouken@279
   745
slouken@279
   746
SDL_Surface* IMG_LoadJPG_RW (SDL_RWops *src)
slouken@279
   747
{
slouken@279
   748
    return LoadImageFromRWops (src, kUTTypeJPEG);
slouken@279
   749
}
slouken@279
   750
slouken@279
   751
SDL_Surface* IMG_LoadPNG_RW (SDL_RWops *src)
slouken@279
   752
{
slouken@279
   753
    return LoadImageFromRWops (src, kUTTypePNG);
slouken@279
   754
}
slouken@279
   755
slouken@279
   756
SDL_Surface* IMG_LoadTGA_RW (SDL_RWops *src)
slouken@279
   757
{
slouken@279
   758
    return LoadImageFromRWops(src, CFSTR("com.truevision.tga-image"));
slouken@279
   759
}
slouken@279
   760
slouken@279
   761
SDL_Surface* IMG_LoadTIF_RW (SDL_RWops *src)
slouken@279
   762
{
slouken@279
   763
    return LoadImageFromRWops(src, kUTTypeTIFF);
slouken@279
   764
}
slouken@279
   765
slouken@279
   766
// Since UIImage doesn't really support streams well, we should optimize for the file case.
slouken@187
   767
// Apple provides both stream and file loading functions in ImageIO.
slouken@187
   768
// Potentially, Apple can optimize for either case.
slouken@279
   769
SDL_Surface* IMG_Load (const char *file)
slouken@187
   770
{
slouken@279
   771
    SDL_Surface* sdl_surface = NULL;
slouken@368
   772
slouken@279
   773
    sdl_surface = LoadImageFromFile(file);
slouken@279
   774
    if(NULL == sdl_surface)
slouken@279
   775
    {
slouken@279
   776
        // Either the file doesn't exist or ImageIO doesn't understand the format.
slouken@279
   777
        // For the latter case, fallback to the native SDL_image handlers.
slouken@279
   778
        SDL_RWops *src = SDL_RWFromFile(file, "rb");
slouken@279
   779
        char *ext = strrchr(file, '.');
slouken@279
   780
        if (ext) {
slouken@279
   781
            ext++;
slouken@279
   782
        }
slouken@279
   783
        if (!src) {
slouken@279
   784
            /* The error message has been set in SDL_RWFromFile */
slouken@279
   785
            return NULL;
slouken@279
   786
        }
slouken@279
   787
        sdl_surface = IMG_LoadTyped_RW(src, 1, ext);
slouken@279
   788
    }
slouken@279
   789
    return sdl_surface;
slouken@187
   790
}
slouken@187
   791
slouken@240
   792
#endif /* defined(__APPLE__) && !defined(SDL_IMAGE_USE_COMMON_BACKEND) */