使用子像素别名在图像中缓存 NSView

发布于 2024-12-03 01:56:10 字数 624 浏览 0 评论 0原文

我想定期在 NSImage 中缓存 PDFView 的可见边界。稍后我会将图像绘制到屏幕上，因此我希望它看起来与原始 PDFView 完全相同。但是，在图像上下文中绘制 PDFView 的文本时，我无法让 Cocoa 使用子像素抗锯齿功能。它确实使用普通（即非 LCD）抗锯齿，但这会导致文本明显变浅。

有没有一种便携式方法可以解决这个问题？也就是说，当显示器支持子像素抗锯齿时，是否有办法在 NSImage 中缓存 NSView ？

我的代码：

PDFView *pdfView = ...
NSBitmapImageRep *rep = [pdfView bitmapImageRepForCachingDisplayInRect:[pdfView bounds]];

[pdfView cacheDisplayInRect:[pdfView bounds] toBitmapImageRep:rep];

NSImage *image = [[NSImage alloc] initWithSize:[rep size]];
[image addRepresentation:rep];

原文

I want to periodically cache the visible bounds of a PDFView in an NSImage. I will later draw the image to the screen, so I'd like it to look exactly the same as the original PDFView. However, I can't get Cocoa to use subpixel anti-aliasing when drawing the text of the PDFView in the image context. It does use plain (i.e., non-LCD) anti-aliasing, but that results in noticeably lighter text.

Is there a portable way to fix this? That is, is there a way cache an NSView in an NSImage using subpixel anti-aliasing when the monitor supports it?

My code:

PDFView *pdfView = ...
NSBitmapImageRep *rep = [pdfView bitmapImageRepForCachingDisplayInRect:[pdfView bounds]];

[pdfView cacheDisplayInRect:[pdfView bounds] toBitmapImageRep:rep];

NSImage *image = [[NSImage alloc] initWithSize:[rep size]];
[image addRepresentation:rep];

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