Repo created

iphone/Maps/Core/WebImage/MWMImageCoder.m

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+#import "MWMImageCoder.h"
+
+@implementation MWMImageCoder
+
+- (UIImage *)imageWithData:(NSData *)data {
+  UIImage *image = [UIImage imageWithData:data];
+  if (!image) {
+    return nil;
+  }
+
+  CGImageRef cgImage = image.CGImage;
+  size_t width = CGImageGetWidth(cgImage);
+  size_t height = CGImageGetHeight(cgImage);
+  int32_t flags;
+  if ([self imageHasAlpha:image]) {
+    flags = kCGImageAlphaPremultipliedLast;
+  } else {
+    flags = kCGImageAlphaNoneSkipLast;
+  }
+
+  CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
+  CGContextRef context = CGBitmapContextCreate(NULL, width, height, 8, width * 4, colorSpace, flags);
+  CGColorSpaceRelease(colorSpace);
+
+  CGContextDrawImage(context, CGRectMake(0, 0, width, height), cgImage);
+  CGImageRef resultCgImage = CGBitmapContextCreateImage(context);
+  UIImage *resultImage = [UIImage imageWithCGImage:resultCgImage];
+
+  CGImageRelease(resultCgImage);
+  CGContextRelease(context);
+
+  return resultImage;
+}
+
+- (NSData *)dataFromImage:(UIImage *)image {
+  if ([self imageHasAlpha:image]) {
+    return UIImagePNGRepresentation(image);
+  } else {
+    return UIImageJPEGRepresentation(image, 0.9);
+  }
+}
+
+- (BOOL)imageHasAlpha:(UIImage *)image {
+  CGImageAlphaInfo alphaInfo = CGImageGetAlphaInfo(image.CGImage);
+  return (alphaInfo == kCGImageAlphaPremultipliedLast ||
+          alphaInfo == kCGImageAlphaPremultipliedFirst ||
+          alphaInfo == kCGImageAlphaLast ||
+          alphaInfo == kCGImageAlphaFirst);
+}
+
+@end