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#include <mbgl/util/image.hpp>
#import <ImageIO/ImageIO.h>
#import <webp/decode.h>
#if TARGET_OS_IPHONE
#import <MobileCoreServices/MobileCoreServices.h>
#else
#import <CoreServices/CoreServices.h>
#endif
namespace mbgl {
std::string encodePNG(const PremultipliedImage& src) {
CGDataProviderRef provider = CGDataProviderCreateWithData(NULL, src.data.get(), src.size(), NULL);
if (!provider) {
return "";
}
CGColorSpaceRef color_space = CGColorSpaceCreateDeviceRGB();
if (!color_space) {
CGDataProviderRelease(provider);
return "";
}
CGImageRef image = CGImageCreate(src.width, src.height, 8, 32, 4 * src.width, color_space,
kCGBitmapByteOrderDefault | kCGImageAlphaPremultipliedLast, provider, NULL, false,
kCGRenderingIntentDefault);
if (!image) {
CGColorSpaceRelease(color_space);
CGDataProviderRelease(provider);
return "";
}
CFMutableDataRef data = CFDataCreateMutable(kCFAllocatorDefault, 0);
if (!data) {
CGImageRelease(image);
CGColorSpaceRelease(color_space);
CGDataProviderRelease(provider);
return "";
}
CGImageDestinationRef image_destination = CGImageDestinationCreateWithData(data, kUTTypePNG, 1, NULL);
if (!image_destination) {
CFRelease(data);
CGImageRelease(image);
CGColorSpaceRelease(color_space);
CGDataProviderRelease(provider);
return "";
}
CGImageDestinationAddImage(image_destination, image, NULL);
CGImageDestinationFinalize(image_destination);
const std::string result {
reinterpret_cast<const char *>(CFDataGetBytePtr(data)),
static_cast<size_t>(CFDataGetLength(data))
};
CFRelease(image_destination);
CFRelease(data);
CGImageRelease(image);
CGColorSpaceRelease(color_space);
CGDataProviderRelease(provider);
return result;
}
PremultipliedImage decodeWebP(const uint8_t*, size_t);
PremultipliedImage decodeImage(const std::string &source_data) {
// CoreFoundation does not decode WebP natively.
size_t size = source_data.size();
if (size >= 12) {
const uint8_t* data = reinterpret_cast<const uint8_t*>(source_data.data());
uint32_t riff_magic = (data[0] << 24) | (data[1] << 16) | (data[2] << 8) | data[3];
uint32_t webp_magic = (data[8] << 24) | (data[9] << 16) | (data[10] << 8) | data[11];
if (riff_magic == 0x52494646 && webp_magic == 0x57454250) {
return decodeWebP(data, size);
}
}
CFDataRef data = CFDataCreateWithBytesNoCopy(kCFAllocatorDefault, reinterpret_cast<const unsigned char *>(source_data.data()), size, kCFAllocatorNull);
if (!data) {
throw std::runtime_error("CFDataCreateWithBytesNoCopy failed");
}
CGImageSourceRef image_source = CGImageSourceCreateWithData(data, NULL);
if (!image_source) {
CFRelease(data);
throw std::runtime_error("CGImageSourceCreateWithData failed");
}
CGImageRef image = CGImageSourceCreateImageAtIndex(image_source, 0, NULL);
if (!image) {
CFRelease(image_source);
CFRelease(data);
throw std::runtime_error("CGImageSourceCreateImageAtIndex failed");
}
CGColorSpaceRef color_space = CGColorSpaceCreateDeviceRGB();
if (!color_space) {
CGImageRelease(image);
CFRelease(image_source);
CFRelease(data);
throw std::runtime_error("CGColorSpaceCreateDeviceRGB failed");
}
PremultipliedImage result { CGImageGetWidth(image), CGImageGetHeight(image) };
CGContextRef context = CGBitmapContextCreate(result.data.get(), result.width, result.height, 8, result.stride(),
color_space, kCGImageAlphaPremultipliedLast);
if (!context) {
CGColorSpaceRelease(color_space);
CGImageRelease(image);
CFRelease(image_source);
CFRelease(data);
throw std::runtime_error("CGBitmapContextCreate failed");
}
CGContextSetBlendMode(context, kCGBlendModeCopy);
CGRect rect = {{ 0, 0 }, { static_cast<CGFloat>(result.width), static_cast<CGFloat>(result.height) }};
CGContextDrawImage(context, rect, image);
CGContextRelease(context);
CGColorSpaceRelease(color_space);
CGImageRelease(image);
CFRelease(image_source);
CFRelease(data);
return result;
}
}
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