在非視網膜上使用塊代碼模糊NSImage旋轉

我正在使用以下函數來旋轉NSImage。它使用塊代碼爲了正確渲染視網膜。現在的問題是，它在非視網膜屏幕上呈現模糊。在非視網膜上使用塊代碼模糊NSImage旋轉

我試着檢查視網膜顯示器[NSWindow backingScaleFactor]，然後在非視網膜顯示器上使用非阻擋方法，但是這種情況無法使用 - 如果用戶有視網膜Mac，但是正在向外部非視網膜顯示器顯示時，檢查backingScaleFactor會報告視網膜屏幕。後來我發現蘋果的開發者網站這個文件：

API來支持高分辨率 https://developer.apple.com/library/mac/documentation/GraphicsAnimation/Conceptual/HighResolutionOSX/APIs/APIs.html

但它坦率地說不可思議。如何修改以下功能以在非視網膜顯示上模糊？

- (NSImage *)imageRotatedByDegrees:(CGFloat)degrees { 
// calculate the bounds for the rotated image 
NSRect imageBounds = {NSZeroPoint, [self size]}; 
NSBezierPath *boundsPath = [NSBezierPath bezierPathWithRect:imageBounds]; 
NSAffineTransform *transform = [NSAffineTransform transform]; 

[transform rotateByDegrees:degrees]; 
[boundsPath transformUsingAffineTransform:transform]; 

NSRect rotatedBounds = {NSZeroPoint, [boundsPath bounds].size}; 

// center the image within the rotated bounds 
imageBounds.origin.x = NSMidX(rotatedBounds) - (NSWidth (imageBounds)/2); 
imageBounds.origin.y = NSMidY(rotatedBounds) - (NSHeight (imageBounds)/2); 

NSImage *rotatedImage = [NSImage imageWithSize:rotatedBounds.size flipped:NO drawingHandler:^BOOL (NSRect dstRect) { 
    // set up the rotation transform 
    NSAffineTransform *transform=[NSAffineTransform transform]; 
    [transform translateXBy:+(NSWidth(rotatedBounds)/2) yBy:+(NSHeight(rotatedBounds)/2)]; 
    [transform rotateByDegrees:degrees]; 
    [transform translateXBy:-(NSWidth(rotatedBounds)/2) yBy:-(NSHeight(rotatedBounds)/2)]; 

    // draw the original image, rotated, into the new image 
    [transform concat]; 
    [self drawInRect:imageBounds fromRect:NSZeroRect operation:NSCompositeCopy fraction:1.0]; 
    return YES; 
}]; 

return rotatedImage; 
}

由於

來源

2015-10-09 Edward

嘗試此

（NSImage中*）rotateImagedByDegrees：（CGFloat的）度圖像：（NSImage中*）sourceImage {

NSImage *image = sourceImage; 

if (degrees == 0) 
{ 
    return image; 
} 
else 
{ 

    NSRect imageBounds = {NSZeroPoint, [sourceImage size]}; 
    NSSize rotatedSize = NSMakeSize(sourceImage.size.height, sourceImage.size.width) ; 
    NSImage* rotatedImage = [[NSImage alloc] initWithSize:rotatedSize] ; 

    NSBezierPath* boundsPath = [NSBezierPath bezierPathWithRect:imageBounds]; 
    NSAffineTransform* transform = [NSAffineTransform transform]; 
    [transform rotateByDegrees:-1.0 * degrees]; 
    [boundsPath transformUsingAffineTransform:transform]; 
    NSRect rotatedBounds = {NSZeroPoint, [boundsPath bounds].size}; 
    imageBounds.origin.x = NSMidX(rotatedBounds) - (NSWidth(imageBounds)/2); 
    imageBounds.origin.y = NSMidY(rotatedBounds) - (NSHeight(imageBounds)/2); 

    rotatedImage = [NSImage imageWithSize:rotatedBounds.size flipped:NO drawingHandler:NO]; 

    NSAffineTransform* transform1 = [NSAffineTransform transform]; 
    [transform1 translateXBy:+(NSWidth(rotatedBounds)/2) yBy:+(NSHeight(rotatedBounds)/2)]; 
    [transform1 rotateByDegrees:-1.0 * degrees]; 
    [transform1 translateXBy:-(NSWidth(rotatedBounds)/2) yBy:-(NSHeight(rotatedBounds)/2)]; 
    [rotatedImage lockFocus] ; 
    [transform1 concat] ; 

    [sourceImage drawInRect:imageBounds 
        fromRect:NSMakeRect(0.0, 0.0, [sourceImage size].width, [sourceImage size].height) 
        operation:NSCompositeSourceOver fraction:1.0]; 

    [rotatedImage unlockFocus] ; 
    return rotatedImage;

} }

來源

2016-04-06 12:58:41

在非視網膜上使用塊代碼模糊NSImage旋轉

回答

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