Update YYCoder to support new 5.15.0 encodeWithFrames API

Author: dreampiggy

SDWebImageYYPlugin/Classes/YYImage/YYImageBridge/SDImageYYCoder.m

@@ -123,6 +123,24 @@ - (BOOL)canEncodeToFormat:(SDImageFormat)format {
 }
 
 - (NSData *)encodedDataWithImage:(UIImage *)image format:(SDImageFormat)format options:(SDImageCoderOptions *)options {
+    if (!image) {
+        return nil;
+    }
+    
+    NSArray<SDImageFrame *> *frames = [SDImageCoderHelper framesFromAnimatedImage:image];
+    if (!frames || frames.count == 0) {
+        SDImageFrame *frame = [SDImageFrame frameWithImage:image duration:0];
+        frames = @[frame];
+    }
+    return [self encodedDataWithFrames:frames loopCount:image.sd_imageLoopCount format:format options:options];
+}
+
+- (NSData *)encodedDataWithFrames:(NSArray<SDImageFrame *> *)frames loopCount:(NSUInteger)loopCount format:(SDImageFormat)format options:(SDImageCoderOptions *)options {
+    UIImage *image = frames.firstObject.image; // Primary image
+    if (!image) {
+        return nil;
+    }
+
     double compressionQuality = 1;
     if (options[SDImageCoderEncodeCompressionQuality]) {
         compressionQuality = [options[SDImageCoderEncodeCompressionQuality] doubleValue];
@@ -133,15 +151,14 @@ - (NSData *)encodedDataWithImage:(UIImage *)image format:(SDImageFormat)format o
     YYImageType type = YYImageTypeFromSDImageFormat(format);
     BOOL encodeFirstFrame = [options[SDImageCoderEncodeFirstFrameOnly] boolValue];
 
-    NSArray<SDImageFrame *> *frames = [SDImageCoderHelper framesFromAnimatedImage:image];
-    if (encodeFirstFrame || frames.count == 0) {
+    if (encodeFirstFrame || frames.count <= 1) {
         // Static Image
         imageData = [YYImageEncoder encodeImage:image type:type quality:compressionQuality];
     } else {
         // Animated Image
         YYImageEncoder *encoder = [[YYImageEncoder alloc] initWithType:type];
         encoder.quality = compressionQuality;
-        encoder.loopCount = image.sd_imageLoopCount;
+        encoder.loopCount = loopCount;
         if (!encoder) {
             return nil;
         }
@@ -152,7 +169,6 @@ - (NSData *)encodedDataWithImage:(UIImage *)image format:(SDImageFormat)format o
         imageData = [encoder encode];
     }
 
-    
     return imageData;
 }