非视网膜上块码模糊的NSImage旋转

Question

我使用下面的函数来旋转一个NSImage。它使用块代码，以便正确地在视网膜上渲染。现在的问题是，它会使非视网膜屏幕变得模糊。

我试着检查视网膜显示器NSWindow backingScaleFactor，然后在非视网膜显示器上使用一种非阻塞的方法，但在这种情况下，它不起作用--如果用户有一个视网膜Mac，但正在向外部非视网膜显示器显示，检查backingScaleFactor报告一个视网膜屏幕。然后我在苹果的开发者网站上找到了这个文档：

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

但坦率地说，这是无法理解的。如何在非视网膜显示器上改变以下功能以避免模糊？

- (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;
}

谢谢

Answer 1

尝尝这个

• (NSImage*)rotateImagedByDegrees:(CGFloat)degrees图像：(NSImage *)sourceImage { NSImage* == = sourceImage；if (== 0) {返回图像；} 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=NSAffineTransform transform：-1.0度；boundsPath变换NSAffineTransform: transform；NSImage={en20#，en22#}；_x= NSMidX(rotatedBounds) - (NSWidth(imageBounds) / 2)；_(_transform1 translateXBy:-(NSWidth(rotatedBounds) / 2) yBy:-(NSHeight(rotatedBounds) / 2)；rotatedImage lockFocus；transform1 concat；[sourceImage drawInRect:ImageE犬来自return :NSMakeRect( 0.0，0.0，sourceImage size.width，sourceImage size.height)操作:NSCompositeSourceOver分数:1.0]；rotatedImage unlockFocus；返回rotatedImage； }}