将32位RGBA缓冲区保存到.png文件（Cocoa OSX） [英] Saving a 32 bit RGBA buffer into a .png file (Cocoa OSX)

问题描述

我需要将像素编辑器应用程序的内容保存为.png文件，但我无法找到实现此目的的最佳方法。像素数据存储在32位RGBA缓冲器中。任何人都可以建议任何好的工具，我可以用来完成这个？

I need to save the contents of a pixel editor application into a .png file but I am having trouble finding the best way to accomplish this. The pixel data is stored in a 32 bit RGBA buffer. Can anyone suggest any good tools I could use to accomplish this?

编辑：
不幸的是，CGImage和representationUsingType：不支持cocotron，我需要能够定位我的应用程序的PC版本，建议第三种方式完成这项任务？

Unfortunately, CGImage and representationUsingType: are not supported by cocotron and I need to be able to target my app for PC release as well, can anyone suggest a third way of accomplishing this task?

推荐答案

NSBitmapImageRep 应该会得到你所需要的。将数据加载到 NSBitmapImageRep
中，然后使用 representationUsingType：properties： PNG。一个快速示例：

NSBitmapImageRep should get you what you need. Load the data up into the NSBitmapImageRep and then use representationUsingType:properties: to get it out as a PNG. A quick example:

NSBitmapImageRep *imageRep = 
    [[NSBitmapImageRep alloc] initWithBitmapDataPlanes:imageBuffer
                                            pixelsWide:imageWidth
                                            pixelsHigh:imageHeight
                                         bitsPerSample:8
                                       samplesPerPixel:4
                                              hasAlpha:YES
                                              isPlanar:NO
                                        colorSpaceName:NSDeviceRGBColorSpace
                                          bitmapFormat:NSAlphaFirstBitmapFormat
                                           bytesPerRow:imageWidth * 4
                                          bitsPerPixel:32];
NSData *pngData = [imageRep representationUsingType:NSPNGFileType 
                                         properties:propertyDictionary];

如果您不能使用这些Cocoa方法，请查看 libpng 。

If you can't use these Cocoa methods, check out libpng.

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