Chain 2 Renderscript Intrinsics : Blur & ColorMatrix

Question

我试图链接两个Renderscript: ScriptIntrinsicBlur和ScriptIntrinsicColorMatrix。

我想要模糊和图像，然后应用一个颜色过滤器。

下面是我当前的代码(我尝试了许多不同的实现，包括ScriptGroups，我无法工作)：

final ScriptIntrinsicBlur scriptBlur = ScriptIntrinsicBlur.create(
        mRenderScript,
        Element.U8_4(mRenderScript));
final Allocation input = Allocation.createFromBitmap(mRenderScript,
        bmp);
Bitmap blurOutBitmap = bmp.copy(bmp.getConfig(), true);
final Allocation output = Allocation.createFromBitmap(
        mRenderScript, blurOutBitmap);

scriptBlur.setRadius(mBlur_Radius);
scriptBlur.setInput(input);
scriptBlur.forEach(output);
bmp.recycle();
output.copyTo(blurOutBitmap);

mRenderScript.finish();

final ScriptIntrinsicColorMatrix scriptColor = ScriptIntrinsicColorMatrix
        .create(mRenderScript, Element.U8_4(mRenderScript));

/** for a first test, I am using a simple blue filter **/
Matrix3f mat = new Matrix3f(new float[] {
        1, 0, 1,
        0, 1, 1,
        0, 0, 1
});
scriptColor.setColorMatrix(mat);

final Allocation colorInput = Allocation.createFromBitmap(mRenderScript,
        blurOutBitmap);
Bitmap outBitmap = bmp.copy(blurOutBitmap.getConfig(), true);
final Allocation colorOutput = Allocation.createFromBitmap(
        mRenderScript, outBitmap);

scriptColor.forEach(colorInput, colorOutput);
blurOutBitmap.recycle();
colorOutput.copyTo(outBitmap);
displayBitmap(outBitmap);

这段代码在图像上产生非常难看的工件(并行红线)，如果我尝试使用ScriptGroup，它就会崩溃。

有过Renderscript经验的人能帮我破译为什么吗？因为很少有关于这个主题的样本或文档，所以我不得不尝试随机修改。

Answer 1

下面是正确的方法(或者至少一种可行的方法，这种情况有点错误)：

Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.lenna);

ScriptIntrinsicBlur scriptBlur = ScriptIntrinsicBlur.create(mRenderScript, Element.U8_4(mRenderScript));
scriptBlur.setRadius(5f);

ScriptIntrinsicColorMatrix scriptColor = ScriptIntrinsicColorMatrix.create(mRenderScript, Element.U8_4(mRenderScript));

final Allocation input = Allocation.createFromBitmap(mRenderScript, bitmap,
        Allocation.MipmapControl.MIPMAP_NONE,
        Allocation.USAGE_SCRIPT | Allocation.USAGE_SHARED);
scriptBlur.setInput(input);
Bitmap outBitmap = bitmap.copy(bitmap.getConfig(), true);
final Allocation output = Allocation.createTyped(mRenderScript, input.getType());


scriptColor.setColorMatrix(new Matrix4f(
        new float[]{1, 0f, 0f,   0,
                    1, 1,  0f,   0,
                    1, 0f, 1,    0,
                    0, 0,  0,    1}
));


ScriptGroup.Builder b = new ScriptGroup.Builder(mRenderScript);
b.addKernel(scriptBlur.getKernelID());
b.addKernel(scriptColor.getKernelID());
b.addConnection(input.getType(), scriptBlur.getKernelID(), scriptColor.getKernelID());
ScriptGroup group = b.create();

// group.setInput(scriptBlur.getKernelID(),input);
group.setOutput(scriptColor.getKernelID(), output);


group.execute();
output.copyTo(outBitmap);
return outBitmap;