CoreImage - 在 CPU 上运行过滤器

发布于 2024-12-19 21:25:15 字数 1079 浏览 2 评论 0原文

我想在 CPU 上运行一些 CoreImage 过滤器，而不是 GPU。在 CI 文档中，我发现您可以通过创建类似这样的上下文（参见此处)：

NSDictionary * cpuonlycontextOptions = [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithBool: YES],kCIContextUseSoftwareRenderer,nil];
CGContextRef cgcontext = [[NSGraphicsContext graphicsContextWithBitmapImageRep:rep] graphicsPort];
CIContext * cpu_context = [CIContext contextWithCGContext:cgcontext options: cpuonlycontextOptions];

要应用过滤器，我目前正在这样做：

NSBitmapImageRep * bitmaprep_in;
CGImageRef cg_image_in = [bitmaprep_in CGImage];

CIImage * ci_image_in = [CIImage imageWithCGImage:cg_image_in];

CIFilter * edge_filter = [CIFilter filterWithName:@"CIEdges"];
[edge_filter setDefaults];
[edge_filter setValue:ci_image_in forKey: @"inputImage"];

CIImage * result = [edge_filter valueForKey: @"outputImage"];

NSBitmapImageRep* rep = [[NSBitmapImageRep alloc]  initWithCIImage:result];

问题是，我看不到在哪里或如何设置CPU只有 CI 上下文。如何正确完成此操作？

原文

I'd like to run some CoreImage filters on the CPU, instead of the GPU. In the CI documentation, I've discovered that you can express your preference that filters be executed on the CPU by creating a context something like this (see here):

NSDictionary * cpuonlycontextOptions = [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithBool: YES],kCIContextUseSoftwareRenderer,nil];
CGContextRef cgcontext = [[NSGraphicsContext graphicsContextWithBitmapImageRep:rep] graphicsPort];
CIContext * cpu_context = [CIContext contextWithCGContext:cgcontext options: cpuonlycontextOptions];

To apply a filter, I'm currently doing this:

NSBitmapImageRep * bitmaprep_in;
CGImageRef cg_image_in = [bitmaprep_in CGImage];

CIImage * ci_image_in = [CIImage imageWithCGImage:cg_image_in];

CIFilter * edge_filter = [CIFilter filterWithName:@"CIEdges"];
[edge_filter setDefaults];
[edge_filter setValue:ci_image_in forKey: @"inputImage"];

CIImage * result = [edge_filter valueForKey: @"outputImage"];

NSBitmapImageRep* rep = [[NSBitmapImageRep alloc]  initWithCIImage:result];

The problem is, I can't see where or how to set the CPU only CI context. How is this done properly?

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如梦亦如幻 2024-12-26 21:25:15

这会强制 CPU 渲染：

NSDictionary *theCIContextOptions = [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithBool:YES], kCIContextUseSoftwareRenderer, NULL];

CIContext *theCIContext = [CIContext contextWithOptions:theCIContextOptions ];

This forces CPU rendering:

NSDictionary *theCIContextOptions = [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithBool:YES], kCIContextUseSoftwareRenderer, NULL];

CIContext *theCIContext = [CIContext contextWithOptions:theCIContextOptions ];

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