Expose the data and format when SDAnimatedImageRep created with APNG/GIF/WebP/HEICS

This can avoid extra decoding (slow) for some cases if you need compressed image data

SDWebImage/Core/SDAnimatedImage.h

@@ -88,6 +88,7 @@
 
 /**
  Current animated image format.
+ @note This format is only valid when `animatedImageData` not nil
  */
 @property (nonatomic, assign, readonly) SDImageFormat animatedImageFormat;
 

SDWebImage/Core/SDAnimatedImageRep.h

@@ -10,6 +10,8 @@
 
 #if SD_MAC
 
+#import "NSData+ImageContentType.h"
+
 /**
  A subclass of `NSBitmapImageRep` to fix that GIF duration issue because `NSBitmapImageRep` will reset `NSImageCurrentFrameDuration` by using `kCGImagePropertyGIFDelayTime` but not `kCGImagePropertyGIFUnclampedDelayTime`.
  This also fix the GIF loop count issue, which will use the Netscape standard (See http://www6.uniovi.es/gifanim/gifabout.htm)  to only place once when the `kCGImagePropertyGIFLoopCount` is nil. This is what modern browser's behavior.
@@ -18,6 +20,14 @@
  */
 @interface SDAnimatedImageRep : NSBitmapImageRep
 
+/// Current animated image format.
+/// @note This format is only valid when `animatedImageData` not nil
+@property (nonatomic, assign, readonly) SDImageFormat animatedImageFormat;
+
+/// This allows to retrive the compressed data like GIF using `sd_imageData` on parent `NSImage`, without re-encoding (waste CPU and RAM)
+/// @note This is typically nonnull when you create with `initWithData:`, even it's marked as weak, because ImageIO retain it
+@property (nonatomic, readonly, nullable, weak) NSData *animatedImageData;
+
 @end
 
 #endif

SDWebImage/Core/SDAnimatedImageRep.m

@@ -19,6 +19,7 @@
 @interface SDAnimatedImageRep ()
 /// This wrap the animated image frames for legacy animated image coder API (`encodedDataWithImage:`).
 @property (nonatomic, readwrite, weak) NSArray<SDImageFrame *> *frames;
+@property (nonatomic, assign, readwrite) SDImageFormat animatedImageFormat;
 @end
 
 @implementation SDAnimatedImageRep {
@@ -33,9 +34,12 @@
 }
 
 - (instancetype)copyWithZone:(NSZone *)zone {
-  SDAnimatedImageRep *imageRep = [super copyWithZone:zone];
-  CFRetain(imageRep->_imageSource);
-  return imageRep;
+    SDAnimatedImageRep *imageRep = [super copyWithZone:zone];
+    // super will copy all ivars
+    if (imageRep->_imageSource) {
+        CFRetain(imageRep->_imageSource);
+    }
+    return imageRep;
 }
 
 // `NSBitmapImageRep`'s `imageRepWithData:` is not designed initializer
@@ -63,15 +67,19 @@
         if (!type) {
             return self;
         }
+        _animatedImageData = data; // CGImageSource will retain the data internally, no extra copy
+        SDImageFormat format = SDImageFormatUndefined;
         if (CFStringCompare(type, kSDUTTypeGIF, 0) == kCFCompareEqualTo) {
             // GIF
             // Fix the `NSBitmapImageRep` GIF loop count calculation issue
             // Which will use 0 when there are no loop count information metadata in GIF data
+            format = SDImageFormatGIF;
             NSUInteger loopCount = [SDImageGIFCoder imageLoopCountWithSource:imageSource];
             [self setProperty:NSImageLoopCount withValue:@(loopCount)];
         } else if (CFStringCompare(type, kSDUTTypePNG, 0) == kCFCompareEqualTo) {
             // APNG
             // Do initialize about frame count, current frame/duration and loop count
+            format = SDImageFormatPNG;
             [self setProperty:NSImageFrameCount withValue:@(frameCount)];
             [self setProperty:NSImageCurrentFrame withValue:@(0)];
             NSUInteger loopCount = [SDImageAPNGCoder imageLoopCountWithSource:imageSource];
@@ -79,6 +87,7 @@
         } else if (CFStringCompare(type, kSDUTTypeHEICS, 0) == kCFCompareEqualTo) {
             // HEIC
             // Do initialize about frame count, current frame/duration and loop count
+            format = SDImageFormatHEIC;
             [self setProperty:NSImageFrameCount withValue:@(frameCount)];
             [self setProperty:NSImageCurrentFrame withValue:@(0)];
             NSUInteger loopCount = [SDImageHEICCoder imageLoopCountWithSource:imageSource];
@@ -86,11 +95,15 @@
         } else if (CFStringCompare(type, kSDUTTypeWebP, 0) == kCFCompareEqualTo) {
             // WebP
             // Do initialize about frame count, current frame/duration and loop count
+            format = SDImageFormatWebP;
             [self setProperty:NSImageFrameCount withValue:@(frameCount)];
             [self setProperty:NSImageCurrentFrame withValue:@(0)];
             NSUInteger loopCount = [SDImageAWebPCoder imageLoopCountWithSource:imageSource];
             [self setProperty:NSImageLoopCount withValue:@(loopCount)];
+        } else {
+            format = [NSData sd_imageFormatForImageData:data];
         }
+        _animatedImageFormat = format;
     }
     return self;
 }

SDWebImage/Core/UIImage+MultiFormat.h

@@ -46,6 +46,7 @@
  Encode the current image to the data, the image format is unspecified
 
  @note If the receiver is `SDAnimatedImage`, this will return the animated image data if available. No more extra encoding process.
+ @note For macOS, if the receiver contains only `SDAnimatedImageRep`, this will return the animated image data if available. No more extra encoding process.
  @return The encoded data. If can't encode, return nil
  */
 - (nullable NSData *)sd_imageData;

SDWebImage/Core/UIImage+MultiFormat.m

@@ -8,6 +8,7 @@
 
 #import "UIImage+MultiFormat.h"
 #import "SDImageCodersManager.h"
+#import "SDAnimatedImageRep.h"
 
 @implementation UIImage (MultiFormat)
 
@@ -28,6 +29,18 @@
 }
 
 - (nullable NSData *)sd_imageData {
+#if SD_MAC
+    NSRect imageRect = NSMakeRect(0, 0, self.size.width, self.size.height);
+    NSImageRep *imageRep = [self bestRepresentationForRect:imageRect context:nil hints:nil];
+    // Check weak assigned frames firstly
+    if ([imageRep isKindOfClass:[SDAnimatedImageRep class]]) {
+        SDAnimatedImageRep *animatedImageRep = (SDAnimatedImageRep *)imageRep;
+        NSData *imageData = [animatedImageRep animatedImageData];
+        if (imageData) {
+            return imageData;
+        }
+    }
+#endif
     return [self sd_imageDataAsFormat:SDImageFormatUndefined];
 }