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cocoa - CIImage绘图EXC_BAD_ACCESS

转载 作者:行者123 更新时间:2023-12-03 16:43:06 25 4
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因此,我尝试在 NSView-drawRect 方法中绘制一个 CIImage

这是我调用来绘制图像的代码行:

[outputCoreImage drawInRect: [self bounds]
fromRect: originalBounds
operation: NSCompositeSourceOver
fraction: 1];

outputCoreImageoriginalBounds[selfbounds] 都是非nil,而且确实是它们的各自的期望值。在 Lion (OS X 10.7) 上,这工作得很好,但是在 Mountain Lion (OS X 10.8) 上,我在这条线上收到 EXC_BAD_ACCESS 。如果我沿着堆栈向上走,我会发现中断的内部函数调用位于 CGLGetPixelFormat 上。

frame #0: 0x00007fff99c3b26d OpenGL`CGLGetPixelFormat + 27
frame #1: 0x00007fff8fa98978 CoreImage`-[CIOpenGLContextImpl createAccelContext] + 335
frame #2: 0x00007fff8fa98d30 CoreImage`-[CIOpenGLContextImpl updateContext] + 111
frame #3: 0x00007fff8fa9a865 CoreImage`-[CIOpenGLContextImpl _lockfeContext] + 25
frame #4: 0x00007fff8fa7e4ac CoreImage`-[CIContextImpl setObject:forKey:] + 120
frame #5: 0x00007fff8fa9881c CoreImage`-[CIOpenGLContextImpl setObject:forKey:] + 259
frame #6: 0x00007fff90db93e3 libCGXCoreImage.A.dylib`cgxcoreimage_instance_render + 1477
frame #7: 0x00007fff97074ac6 CoreGraphics`CGSCoreImageInstanceRender + 32
frame #8: 0x00007fff947c89cc libRIP.A.dylib`ripc_AcquireCoreImage + 1344
frame #9: 0x00007fff947b8a00 libRIP.A.dylib`ripc_DrawShading + 9680
frame #10: 0x00007fff96cb2b2b CoreGraphics`CGContextDrawShading + 51
frame #11: 0x00007fff8fa78237 CoreImage`-[CICGContextImpl render:] + 918
frame #12: 0x00007fff8fa7d76a CoreImage`-[CIContext drawImage:inRect:fromRect:] + 1855
frame #13: 0x00007fff9897b8f3 AppKit`-[CIImage(NSAppKitAdditions) drawInRect:fromRect:operation:fraction:] + 243

我打开了僵尸、保护 malloc 和日志异常,但它们都没有返回任何有用的信息。

其他 OpenGL 测试:

我添加了这个 block :

CIImage *anImage  = [[CIImage alloc] init];
[[[self window] contentView] lockFocus];
{
[anImage drawInRect: [[self window] frame]
fromRect: [[self window] frame]
operation: NSCompositeSourceOver
fraction: 1];
}
[[[self window] contentView] unlockFocus];

到我的NSWindowController-windowDidLoad方法。它运行没有问题。

我添加了这个 block :

NSData *data = [NSData dataWithContentsOfURL: [NSURL URLWithString: @"http://cache.virtualtourist.com/14/684723-Red_Square_Moscow.jpg"]];

CIImage *anImage = [[CIImage alloc] initWithData: data];
[self lockFocus];
{
[anImage drawInRect: [self bounds]
fromRect: [anImage extent]
operation: NSCompositeSourceOver
fraction: 1];
}
[self unlockFocus];

到另一个NSView-drawRect。我在 CGLGetPixelFormat 上收到了同样的错误。

雷达:

#macdev 的人似乎认为这是操作系统问题,我并不反对。我已提交雷达 (rdar://11980704) 解释问题并链接回此问题。

解决方法:

CGContextRef contextReference = [[NSGraphicsContext currentContext] graphicsPort];
CIContext *coreImageContext = [CIContext contextWithCGContext: contextReference
options: @{kCIContextUseSoftwareRenderer : @YES}];

[coreImageContext drawImage: outputCoreImage
inRect: [self bounds]
fromRect: originalBounds];

看起来强制使用软件渲染器绘制图像“解决”了问题。它有点模糊且缓慢,但不会崩溃。

最佳答案

10.8.1 中已解决

#macdev 的人似乎认为这是操作系统问题,我并不反对。我已提交雷达 (rdar://11980704) 解释问题并链接回此问题。

关于cocoa - CIImage绘图EXC_BAD_ACCESS,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/11689233/

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