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[#64 state:fixed] fixed a bug in PictureBlocks where transparency could make two equal pictures return two different sets of blocks.

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extra : convert_revision : svn%3Ac306627e-7827-47d3-bdf0-9a457c9553a1/trunk%40150
This commit is contained in:
hsoft 2009-09-28 15:33:25 +00:00
parent 9a44956d8f
commit 7e45f422e1
2 changed files with 10 additions and 11 deletions
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4
pe/cocoa/PictureBlocks.h
View File

@ -11,9 +11,9 @@ http://www.hardcoded.net/licenses/hs_license
@interface PictureBlocks : NSObject {
}
+ (NSString *)getBlocksFromImagePath:(NSString *)imagePath blockCount:(NSNumber *)blockCount scanArea:(NSNumber *)scanArea;
+ (NSString *)getBlocksFromImagePath:(NSString *)imagePath blockCount:(NSNumber *)blockCount;
+ (NSSize)getImageSize:(NSString *)imagePath;
@end
NSString* GetBlocks(NSString *filePath, int blockCount, int scanSize);
NSString* GetBlocks(NSString *filePath, int blockCount);

17
pe/cocoa/PictureBlocks.m
View File

@ -9,11 +9,10 @@ http://www.hardcoded.net/licenses/hs_license
#import "PictureBlocks.h"
#import "Utils.h"
@implementation PictureBlocks
+ (NSString *)getBlocksFromImagePath:(NSString *)imagePath blockCount:(NSNumber *)blockCount scanArea:(NSNumber *)scanArea
+ (NSString *)getBlocksFromImagePath:(NSString *)imagePath blockCount:(NSNumber *)blockCount
{
return GetBlocks(imagePath, n2i(blockCount), n2i(scanArea));
return GetBlocks(imagePath, n2i(blockCount));
}
+ (NSSize)getImageSize:(NSString *)imagePath
@ -47,7 +46,11 @@ http://www.hardcoded.net/licenses/hs_license
colorSpace = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB);
bitmapData = malloc( bitmapByteCount );
// calloc() must be used to allocate bitmapData here because the buffer has to be zeroed.
// If it's not zeroes, when images with transparency are drawn in the context, this buffer
// will stay with undefined pixels, which means that two pictures with the same pixels will
// most likely have different blocks (which is not supposed to happen).
bitmapData = calloc(bitmapByteCount, 1);
if (bitmapData == NULL)
{
fprintf (stderr, "Memory not allocated!");
@ -90,7 +93,7 @@ http://www.hardcoded.net/licenses/hs_license
return result;
}
NSString* GetBlocks (NSString* filePath, int blockCount, int scanSize)
NSString* GetBlocks (NSString* filePath, int blockCount)
{
CFURLRef fileURL = CFURLCreateWithFileSystemPath(NULL, (CFStringRef)filePath, kCFURLPOSIXPathStyle, FALSE);
CGImageSourceRef source = CGImageSourceCreateWithURL(fileURL, NULL);
@ -101,10 +104,6 @@ http://www.hardcoded.net/licenses/hs_license
return NULL;
size_t width = CGImageGetWidth(image);
size_t height = CGImageGetHeight(image);
if ((scanSize > 0) && (width > scanSize))
width = scanSize;
if ((scanSize > 0) && (height > scanSize))
height = scanSize;
CGContextRef myContext = MyCreateBitmapContext(width, height);
CGRect myBoundingBox = CGRectMake (0, 0, width, height);
CGContextDrawImage(myContext, myBoundingBox, image);