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Pods/SDWebImage/SDWebImage/Core/SDImageCacheDefine.m

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+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDImageCacheDefine.h"
+#import "SDImageCodersManager.h"
+#import "SDImageCoderHelper.h"
+#import "SDAnimatedImage.h"
+#import "UIImage+Metadata.h"
+#import "SDInternalMacros.h"
+#import "SDDeviceHelper.h"
+
+#import <CoreServices/CoreServices.h>
+
+SDImageCoderOptions * _Nonnull SDGetDecodeOptionsFromContext(SDWebImageContext * _Nullable context, SDWebImageOptions options, NSString * _Nonnull cacheKey) {
+    BOOL decodeFirstFrame = SD_OPTIONS_CONTAINS(options, SDWebImageDecodeFirstFrameOnly);
+    NSNumber *scaleValue = context[SDWebImageContextImageScaleFactor];
+    CGFloat scale = scaleValue.doubleValue >= 1 ? scaleValue.doubleValue : SDImageScaleFactorForKey(cacheKey); // Use cache key to detect scale
+    NSNumber *preserveAspectRatioValue = context[SDWebImageContextImagePreserveAspectRatio];
+    NSValue *thumbnailSizeValue;
+    BOOL shouldScaleDown = SD_OPTIONS_CONTAINS(options, SDWebImageScaleDownLargeImages);
+    NSNumber *scaleDownLimitBytesValue = context[SDWebImageContextImageScaleDownLimitBytes];
+    if (scaleDownLimitBytesValue == nil && shouldScaleDown) {
+        // Use the default limit bytes
+        scaleDownLimitBytesValue = @(SDImageCoderHelper.defaultScaleDownLimitBytes);
+    }
+    if (context[SDWebImageContextImageThumbnailPixelSize]) {
+        thumbnailSizeValue = context[SDWebImageContextImageThumbnailPixelSize];
+    }
+    NSString *typeIdentifierHint = context[SDWebImageContextImageTypeIdentifierHint];
+    NSString *fileExtensionHint;
+    if (!typeIdentifierHint) {
+        // UTI has high priority
+        fileExtensionHint = cacheKey.pathExtension; // without dot
+        if (fileExtensionHint.length == 0) {
+            // Ignore file extension which is empty
+            fileExtensionHint = nil;
+        }
+    }
+    
+    // First check if user provided decode options
+    SDImageCoderMutableOptions *mutableCoderOptions;
+    if (context[SDWebImageContextImageDecodeOptions] != nil) {
+        mutableCoderOptions = [NSMutableDictionary dictionaryWithDictionary:context[SDWebImageContextImageDecodeOptions]];
+    } else {
+        mutableCoderOptions = [NSMutableDictionary dictionaryWithCapacity:6];
+    }
+    
+    // Some options need preserve the custom decode options
+    NSNumber *decodeToHDR = context[SDWebImageContextImageDecodeToHDR];
+    if (decodeToHDR == nil) {
+        decodeToHDR = mutableCoderOptions[SDImageCoderDecodeToHDR];
+    }
+    
+    // Override individual options
+    mutableCoderOptions[SDImageCoderDecodeFirstFrameOnly] = @(decodeFirstFrame);
+    mutableCoderOptions[SDImageCoderDecodeScaleFactor] = @(scale);
+    mutableCoderOptions[SDImageCoderDecodePreserveAspectRatio] = preserveAspectRatioValue;
+    mutableCoderOptions[SDImageCoderDecodeThumbnailPixelSize] = thumbnailSizeValue;
+    mutableCoderOptions[SDImageCoderDecodeTypeIdentifierHint] = typeIdentifierHint;
+    mutableCoderOptions[SDImageCoderDecodeFileExtensionHint] = fileExtensionHint;
+    mutableCoderOptions[SDImageCoderDecodeScaleDownLimitBytes] = scaleDownLimitBytesValue;
+    mutableCoderOptions[SDImageCoderDecodeToHDR] = decodeToHDR;
+    
+    return [mutableCoderOptions copy];
+}
+
+void SDSetDecodeOptionsToContext(SDWebImageMutableContext * _Nonnull mutableContext, SDWebImageOptions * _Nonnull mutableOptions, SDImageCoderOptions * _Nonnull decodeOptions) {
+    if ([decodeOptions[SDImageCoderDecodeFirstFrameOnly] boolValue]) {
+        *mutableOptions |= SDWebImageDecodeFirstFrameOnly;
+    } else {
+        *mutableOptions &= ~SDWebImageDecodeFirstFrameOnly;
+    }
+    
+    mutableContext[SDWebImageContextImageScaleFactor] = decodeOptions[SDImageCoderDecodeScaleFactor];
+    mutableContext[SDWebImageContextImagePreserveAspectRatio] = decodeOptions[SDImageCoderDecodePreserveAspectRatio];
+    mutableContext[SDWebImageContextImageThumbnailPixelSize] = decodeOptions[SDImageCoderDecodeThumbnailPixelSize];
+    mutableContext[SDWebImageContextImageScaleDownLimitBytes] = decodeOptions[SDImageCoderDecodeScaleDownLimitBytes];
+    mutableContext[SDWebImageContextImageDecodeToHDR] = decodeOptions[SDImageCoderDecodeToHDR];
+    
+    NSString *typeIdentifierHint = decodeOptions[SDImageCoderDecodeTypeIdentifierHint];
+    if (!typeIdentifierHint) {
+        NSString *fileExtensionHint = decodeOptions[SDImageCoderDecodeFileExtensionHint];
+        if (fileExtensionHint) {
+            typeIdentifierHint = (__bridge_transfer NSString *)UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, (__bridge CFStringRef)fileExtensionHint, kUTTypeImage);
+            // Ignore dynamic UTI
+            if (UTTypeIsDynamic((__bridge CFStringRef)typeIdentifierHint)) {
+                typeIdentifierHint = nil;
+            }
+        }
+    }
+    mutableContext[SDWebImageContextImageTypeIdentifierHint] = typeIdentifierHint;
+}
+
+UIImage * _Nullable SDImageCacheDecodeImageData(NSData * _Nonnull imageData, NSString * _Nonnull cacheKey, SDWebImageOptions options, SDWebImageContext * _Nullable context) {
+    NSCParameterAssert(imageData);
+    NSCParameterAssert(cacheKey);
+    UIImage *image;
+    SDImageCoderOptions *coderOptions = SDGetDecodeOptionsFromContext(context, options, cacheKey);
+    BOOL decodeFirstFrame = SD_OPTIONS_CONTAINS(options, SDWebImageDecodeFirstFrameOnly);
+    CGFloat scale = [coderOptions[SDImageCoderDecodeScaleFactor] doubleValue];
+    
+    // Grab the image coder
+    id<SDImageCoder> imageCoder = context[SDWebImageContextImageCoder];
+    if (!imageCoder) {
+        imageCoder = [SDImageCodersManager sharedManager];
+    }
+    
+    if (!decodeFirstFrame) {
+        Class animatedImageClass = context[SDWebImageContextAnimatedImageClass];
+        // check whether we should use `SDAnimatedImage`
+        if ([animatedImageClass isSubclassOfClass:[UIImage class]] && [animatedImageClass conformsToProtocol:@protocol(SDAnimatedImage)]) {
+            image = [[animatedImageClass alloc] initWithData:imageData scale:scale options:coderOptions];
+            if (image) {
+                // Preload frames if supported
+                if (options & SDWebImagePreloadAllFrames && [image respondsToSelector:@selector(preloadAllFrames)]) {
+                    [((id<SDAnimatedImage>)image) preloadAllFrames];
+                }
+            } else {
+                // Check image class matching
+                if (options & SDWebImageMatchAnimatedImageClass) {
+                    return nil;
+                }
+            }
+        }
+    }
+    if (!image) {
+        image = [imageCoder decodedImageWithData:imageData options:coderOptions];
+    }
+    if (image) {
+        SDImageForceDecodePolicy policy = SDImageForceDecodePolicyAutomatic;
+        NSNumber *policyValue = context[SDWebImageContextImageForceDecodePolicy];
+        if (policyValue != nil) {
+            policy = policyValue.unsignedIntegerValue;
+        }
+        // TODO: Deprecated, remove in SD 6.0...
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
+        if (SD_OPTIONS_CONTAINS(options, SDWebImageAvoidDecodeImage)) {
+            policy = SDImageForceDecodePolicyNever;
+        }
+#pragma clang diagnostic pop
+        image = [SDImageCoderHelper decodedImageWithImage:image policy:policy];
+        // assign the decode options, to let manager check whether to re-decode if needed
+        image.sd_decodeOptions = coderOptions;
+    }
+    
+    return image;
+}