错误的Canvas.drawVertices？（与摄制code和logcat的）错误、Canvas、drawVertices、code

2023-09-04 02:53:17 作者：情深缘浅

只要复制粘贴此code到一个简单的框架Android项目。

Simply paste this code into a simple skeleton Android project.

public final class DrawableView extends View
{
    private float[] mVertices = {0, 0, 255, 0, 255, 255, 0, 255};
    private float[] mTexCoords = {0, 0, 255, 0, 255, 255, 0, 255};
    private short[] mIndices = {0, 2, 3, 0, 1, 2};
    private int[] mColors = {Color.RED, Color.GREEN, Color.BLUE, Color.MAGENTA};

    Context mContext;
    BitmapShader mShader;

    public DrawableView(Context context)
    {
        super(context);
        mContext = context;
        mShader = new BitmapShader(BitmapFactory.decodeResource(getResources(), R.drawable.icon), Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        Paint paint = new Paint();
        paint.setColor(Color.RED);
        paint.setShader(mShader);

        canvas.drawVertices(Canvas.VertexMode.TRIANGLES, 8, mVertices, 0, mTexCoords, 0, mColors, 0, mIndices, 0, 6, paint);

        invalidate();
    }
}

然后设置这个作为主要活动的OnCreate主视图。

And then set this as the main view in the onCreate of the main activity.

@Override
public void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(new DrawableView(this));
}

这应该使应用程序退出，没有错误，甚至是强制关闭的对话框。 logcat的给我什么有用的（http://pastebin.com/c67NJnBz），无论是！

This should make the application exit, with no error or even a "force close" dialog. Logcat gives me nothing useful (http://pastebin.com/c67NJnBz), either!

以下两个drawVertices呼叫产生预期的效果，虽然

Both the following drawVertices calls produce the desired effect, though.

canvas.drawVertices(Canvas.VertexMode.TRIANGLES, 8, mVertices, 0, mTexCoords, 0, null, 0, mIndices, 0, 6, paint); // Works!

和

paint.setColor(Color.RED);
// paint.setShader(mShader);

canvas.drawVertices(Canvas.VertexMode.TRIANGLES, 8, mVertices, 0, mTexCoords, 0, mColors, 0, mIndices, 0, 6, paint); // Renders wireframe

我是不是做错了什么？请帮我确定这一个Android API的bug。

Am I doing something wrong? Please help me determine if this an Android API bug.

错误的Canvas.drawVertices？ （与摄制code和logcat的）错误、Canvas、drawVertices、code

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错误的Canvas.drawVertices？（与摄制code和logcat的）错误、Canvas、drawVertices、code