GPUImage：混合两个图像 [英] GPUImage: blending two images

问题描述

我正在使用GPUImage框架（一些旧版本）来混合两个图像（将边框叠加添加到某个图像）。
我更新到最新的框架版本后，应用这样的混合后，我得到一个空的黑色图像。

I was using GPUImage framework (some old version) to blend two images (adding border overlay to a certain image). After I have updated to latest framework version, after applying such a blend, I get an empty black image.

我正在使用下一个方法：

I'm using next method:

- (void)addBorder {
    if (currentBorder != kBorderInitialValue) {
        GPUImageAlphaBlendFilter *blendFilter = [[GPUImageAlphaBlendFilter alloc] init];
        GPUImagePicture *imageToProcess = [[GPUImagePicture alloc] initWithImage:self.imageToWorkWithView.image];
        GPUImagePicture *border = [[GPUImagePicture alloc] initWithImage:self.imageBorder];

        blendFilter.mix = 1.0f;
        [imageToProcess addTarget:blendFilter];
        [border addTarget:blendFilter];

        [imageToProcess processImage];
        self.imageToWorkWithView.image = [blendFilter imageFromCurrentlyProcessedOutput];

        [blendFilter release];
        [imageToProcess release];
        [border release];
    }
}

有什么问题？

推荐答案

您忘记处理边框图像。在 [imageToProcess processImage] 之后，添加以下行：

You're forgetting to process the border image. After [imageToProcess processImage], add the line:

[border processImage];

如果要将两个图像输入到混合中，则必须使用 - 在将它们添加到混合滤镜后，两者都有processImage 。我改变了混合滤镜的工作方式以修复一些错误，这就是你现在需要做的事情。

For a two images being input into a blend, you have to use -processImage on both after they have been added to the blend filter. I changed the way that the blend filter works in order to fix some bugs, and this is how you need to do things now.

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