Initial commit

2017-08-15 16:59:01 +08:00
commit bdc83e07ef
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+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * Created by james <https://github.com/mystcolor> on 9/28/11.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageDecoder.h"
+
+@implementation UIImage (ForceDecode)
+
+ (UIImage *)decodedImageWithImage:(UIImage *)image {
+    // while downloading huge amount of images
+    // autorelease the bitmap context
+    // and all vars to help system to free memory
+    // when there are memory warning.
+    // on iOS7, do not forget to call
+    // [[SDImageCache sharedImageCache] clearMemory];
+    
+    if (image == nil) { // Prevent "CGBitmapContextCreateImage: invalid context 0x0" error
+        return nil;
+    }
+    
+    @autoreleasepool{
+        // do not decode animated images
+        if (image.images != nil) {
+            return image;
+        }
+        
+        CGImageRef imageRef = image.CGImage;
+        
+        CGImageAlphaInfo alpha = CGImageGetAlphaInfo(imageRef);
+        BOOL anyAlpha = (alpha == kCGImageAlphaFirst ||
+                         alpha == kCGImageAlphaLast ||
+                         alpha == kCGImageAlphaPremultipliedFirst ||
+                         alpha == kCGImageAlphaPremultipliedLast);
+        if (anyAlpha) {
+            return image;
+        }
+        
+        // current
+        CGColorSpaceModel imageColorSpaceModel = CGColorSpaceGetModel(CGImageGetColorSpace(imageRef));
+        CGColorSpaceRef colorspaceRef = CGImageGetColorSpace(imageRef);
+        
+        BOOL unsupportedColorSpace = (imageColorSpaceModel == kCGColorSpaceModelUnknown ||
+                                      imageColorSpaceModel == kCGColorSpaceModelMonochrome ||
+                                      imageColorSpaceModel == kCGColorSpaceModelCMYK ||
+                                      imageColorSpaceModel == kCGColorSpaceModelIndexed);
+        if (unsupportedColorSpace) {
+            colorspaceRef = CGColorSpaceCreateDeviceRGB();
+        }
+        
+        size_t width = CGImageGetWidth(imageRef);
+        size_t height = CGImageGetHeight(imageRef);
+        NSUInteger bytesPerPixel = 4;
+        NSUInteger bytesPerRow = bytesPerPixel * width;
+        NSUInteger bitsPerComponent = 8;
+
+
+        // kCGImageAlphaNone is not supported in CGBitmapContextCreate.
+        // Since the original image here has no alpha info, use kCGImageAlphaNoneSkipLast
+        // to create bitmap graphics contexts without alpha info.
+        CGContextRef context = CGBitmapContextCreate(NULL,
+                                                     width,
+                                                     height,
+                                                     bitsPerComponent,
+                                                     bytesPerRow,
+                                                     colorspaceRef,
+                                                     kCGBitmapByteOrderDefault|kCGImageAlphaNoneSkipLast);
+        
+        // Draw the image into the context and retrieve the new bitmap image without alpha
+        CGContextDrawImage(context, CGRectMake(0, 0, width, height), imageRef);
+        CGImageRef imageRefWithoutAlpha = CGBitmapContextCreateImage(context);
+        UIImage *imageWithoutAlpha = [UIImage imageWithCGImage:imageRefWithoutAlpha
+                                                         scale:image.scale
+                                                   orientation:image.imageOrientation];
+        
+        if (unsupportedColorSpace) {
+            CGColorSpaceRelease(colorspaceRef);
+        }
+        
+        CGContextRelease(context);
+        CGImageRelease(imageRefWithoutAlpha);
+        
+        return imageWithoutAlpha;
+    }
+}
+
+@end