在可可中以编程方式编辑图像？
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我想为我的应用设置自定义鼠标光标，并希望通过将白色边框替换为自定义颜色，以编程方式将默认光标的颜色更改为自定义颜色。问题是我什至不知道从哪里开始以编程方式在Cocoa中编辑图像，因此不胜感激！
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- (NSImage *)customArrowCursorImage { NSImage *image = [[[NSCursor arrowCursor] image] copy]; [image lockFocus]; /// Do custom drawing [image unlockFocus]; } - (NSCursor *)customArrowCursor { NSImage *image = [self customArrowCursorImage]; NSPoint hotSpot = [[NSCursor arrowCursor] hotSpot]; return [[[NSCursor alloc] initWithImage:image hotSpot:hotSpot] autorelease]; }傻寺俊擒
指针中。- (void)setPointerColor:(NSColor *)newColor { // create the new cursor image [[NSGraphicsContext currentContext] CIContext]; // create the layer with the same color as the text CIFilter *backgroundGenerator=[CIFilter filterWithName:@\"CIConstantColorGenerator\"]; CIColor *color=[[[CIColor alloc] initWithColor:newColor] autorelease]; [backgroundGenerator setValue:color forKey:@\"inputColor\"]; CIImage *backgroundImage=[backgroundGenerator valueForKey:@\"outputImage\"]; // create the cursor image CIImage *cursor=[CIImage imageWithData:[[[NSCursor IBeamCursor] image] TIFFRepresentation]]; CIFilter *filter=[CIFilter filterWithName:@\"CIColorInvert\"]; [filter setValue:cursor forKey:@\"inputImage\"]; CIImage *outputImage=[filter valueForKey:@\"outputImage\"]; // apply a multiply filter filter=[CIFilter filterWithName:@\"CIMultiplyCompositing\"]; [filter setValue:backgroundImage forKey:@\"inputImage\"]; [filter setValue:outputImage forKey:@\"inputBackgroundImage\"]; outputImage=[filter valueForKey:@\"outputImage\"]; // get the NSImage from the CIImage NSCIImageRep *rep=[NSCIImageRep imageRepWithCIImage:outputImage]; NSImage *newImage=[[[NSImage alloc] initWithSize:[outputImage extent].size] autorelease]; [newImage addRepresentation:rep]; // remove the old cursor (if any) if (coloredIBeamCursor!=nil) { [self removeCursorRect:[self visibleRect] cursor:coloredIBeamCursor]; [coloredIBeamCursor release]; } // set the new cursor NSCursor *coloredIBeamCursor=[[NSCursor alloc] initWithImage:newImage hotSpot:[[NSCursor IBeamCursor] hotSpot]]; [self resetCursorRects]; }