Windows Phone 8.1 一行等效于 getPixels &来自Android的createBitmap?

问题描述

限时删除！！

我正在使用 android-jhlabs 库从 Android 应用移植一些代码 到 Windows Phone 8.1 运行时应用程序.

I'm porting over some code from an Android app using the android-jhlabs library to a Windows Phone 8.1 runtime app.

代码非常简单，基本上如下所示(在 Java 中):

The code is quite simple and basically looks like the following (in Java):

PointillizeFilter filter = new PointillizeFilter();
filter.setEdgeColor(Color.BLACK);
filter.setScale(10f);
filter.setRandomness(0.1f);
filter.setAmount(0.1f);
filter.setFuzziness(0.1f);
filter.setTurbulence(10f);
filter.setGridType(PointillizeFilter.SQUARE);
int[] src = AndroidUtils.bitmapToIntArray(artWork);
src = filter.filter(src, width, height);
Bitmap destImage = Bitmap.createBitmap(src, width, height, Config.ARGB_8888);

在 Java 中:

public static int[] bitmapToIntArray(Bitmap bitmap){
    final int bitmapWidth = bitmap.getWidth();
    final int bitmapHeight = bitmap.getHeight();

    int[] colors = new int[bitmapWidth *  bitmapHeight];
    bitmap.getPixels(colors, 0, bitmapWidth, 0, 0, bitmapWidth, bitmapHeight);

    return colors;
}

我已将此函数转换为 C#，但有一个小问题:

I've converted this function to C#, with a slight problem:

 public static int[] bitmapToIntArray(BitmapImage bitmapImage)
    {
        int bitmapWidth = bitmapImage.PixelWidth;
        int bitmapHeight = bitmapImage.PixelHeight;

        int[] colors = new int[bitmapWidth * bitmapHeight];

         // how to convert line below?
        //bitmap.getPixels(colors, 0, bitmapWidth, 0, 0, bitmapWidth, bitmapHeight);

        return colors;
    }

查看文档，我看到很多不同的位图类:WriteableBitmap、BitmapImage、BitmapEncoder 和 BitmapDecoder.我没有找到适用于 Windows Phone 8.1 的 getPixel 类，但有一个适用于 Windows Store 应用程序.即使在那里，也只是为了得到一个像素.

Looking through the documentation, I see a lot of different classes for bitmaps: WriteableBitmap, BitmapImage, BitmapEncoder and BitmapDecoder. I did not find a getPixel class for Windows Phone 8.1, but there is one for Windows Store apps. Even there, it's only for getting one pixel.

createBitmap() 命令也是如此.我找不到任何等价物.

Same goes the createBitmap() command. I couldn't find any equivalent.

我的问题是，Windows Phone 8.1 的 getPixels() 和 createBitmap() 命令是否有一行等效的命令?最好使用 BitmapDecoder?

My question is, is there a one line equivalent for the getPixels() and createBitmap() command for Windows Phone 8.1? Would it be best to use the BitmapDecoder?

推荐答案

您必须使用 BitmapDecoder:

You must use BitmapDecoder:

StorageFile file = await ApplicationData.Current.LocalFolder.GetFileAsync(fileName);
IRandomAccessStream stream = await file.OpenAsync(FileAccessMode.Read);
BitmapDecoder decoder = await BitmapDecoder.CreateAsync(stream);

var pixelData = await decoder.GetPixelDataAsync();
var pixels = pixelData.DetachPixelData();

var width = decoder.OrientedPixelWidth;
var height = decoder.OrientedPixelHeight;

for (var i = 0; i < height; i++)
{
    for (var j = 0; j < width; j++)
    {
        byte r = pixels[(i * height + j) * 4 + 0]; //red
        byte g = pixels[(i * height + j) * 4 + 1]; //green
        byte b = pixels[(i * height + j) * 4 + 2]; //blue (rgba)
    }
}

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