64-byte alignment is an even more robust choice for all of the various GPUs. Bump the metadata version

so that image tables created with the previous 32-byte alignment can be tossed.

Author: Mallory Paine

FastImageCache/FICImageTable.m

@@ -133,7 +133,7 @@ - (instancetype)initWithFormat:(FICImageFormat *)imageFormat {
         _screenScale = [[UIScreen mainScreen] scale];
 
         int bytesPerPixel = 4;
-        _imageRowLength = FICByteAlignForCoreAnimation([_imageFormat pixelSize].width * bytesPerPixel, bytesPerPixel);
+        _imageRowLength = FICByteAlignForCoreAnimation([_imageFormat pixelSize].width * bytesPerPixel);
         _imageLength = _imageRowLength * (NSInteger)[_imageFormat pixelSize].height;
 
         _chunkDictionary = CFDictionaryCreateMutable(kCFAllocatorDefault, 0, NULL, NULL); // Non-retained keys and values

FastImageCache/FICImageTableEntry.m

@@ -77,7 +77,7 @@ - (void)dealloc {
 #pragma mark - Other Accessors
 
 + (NSInteger)metadataVersion {
-    return 7;
+    return 8;
 }
 
 - (FICImageTableEntryMetadata *)_metadata {

FastImageCache/FICUtilities.h

@@ -9,7 +9,7 @@
 #import "FICImports.h"
 
 size_t FICByteAlign(size_t bytesPerRow, size_t alignment);
-size_t FICByteAlignForCoreAnimation(size_t bytesPerRow, size_t bytesPerPixel);
+size_t FICByteAlignForCoreAnimation(size_t bytesPerRow);
 
 NSString * FICStringWithUUIDBytes(CFUUIDBytes UUIDBytes);
 CFUUIDBytes FICUUIDBytesWithString(NSString *string);

FastImageCache/FICUtilities.m

@@ -12,20 +12,18 @@
 
 #pragma mark Internal Definitions
 
-#define FIC_CA_BACKING_STORE_ALIGNMENT_PIXELS 8
 // Core Animation will make a copy of any image that a client application provides whose backing store isn't properly byte-aligned.
 // This copy operation can be prohibitively expensive, so we want to avoid this by properly aligning any UIImages we're working with.
-// To produce a UIImage that is properly aligned, we need to ensure that the backing store's bytes per row is a multiple of
-// (bytes per pixel * FIC_CA_BACKING_STORE_ALIGNMENT_PIXELS).
+// To produce a UIImage that is properly aligned, we need to ensure that the backing store's bytes per row is a multiple of 64.
 
 #pragma mark - Byte Alignment
 
 inline size_t FICByteAlign(size_t width, size_t alignment) {
     return ((width + (alignment - 1)) / alignment) * alignment;
 }
 
-inline size_t FICByteAlignForCoreAnimation(size_t bytesPerRow, size_t bytesPerPixel) {
-    return FICByteAlign(bytesPerRow, (bytesPerPixel * FIC_CA_BACKING_STORE_ALIGNMENT_PIXELS));
+inline size_t FICByteAlignForCoreAnimation(size_t bytesPerRow) {
+    return FICByteAlign(bytesPerRow, 64);
 }
 
 #pragma mark - Strings and UUIDs