Android setPixels returning black color

Question

I have the following functions:

private void clearScreen(int color)
{
    fOffscreenImage.eraseColor(color);
}

private void fillRect(int x, int y, int width, int height, int color)
{
    for(;x<width;x++)
    {
        for(;y<height;y++)
        {
            buffer[x+y*PROJECTIONPLANEWIDTH] = color;
        }
    }
}

private void drawBuffer()
{
    fOffscreenImage.setPixels(buffer,0,PROJECTIONPLANEWIDTH,0,0,PROJECTIONPLANEWIDTH,PROJECTIONPLANEHEIGHT);
}

Both functions draw to a bitmap, first is by eraseColor, which works fine, and second is by setPixels, which always returns black. I'm writing the image to a quad displayed with OpenGL. As color input I tried default colors (Color.BLUE) and Color.argb. getPixel does return the correct output of the colors in question.

A by pixel call to setPixel would not work either, it would ignore the job.

I'm tried with Android 2.1 and 2.3.

Any suggestions on this would be great..

Answer 1

private void fillRect(int x, int y, int width, int height, int color)
{
    width += x;
    height += y;
    for(;x<width;x++)
    {
        for(;y<height;y++)
        {
            buffer[x+y*PROJECTIONPLANEWIDTH] = color;
        }
    }
}

should be

private void fillRect(int x, int y, int width, int height, int color)
{
    width += x;
    height += y;
    for(int y2 = y;y2<height;y2++)
    {
        for(int x2 = x;x2<width;x2++)
        {
            buffer[x2+y2*PROJECTIONPLANEWIDTH] = color;
        }
    }
}

Answer 2

I replaced part of the raycaster with the following fillRect code, and it shows white lines on the appropriate places now! Now just to find out other colors as well :)

private void fillRect(int x, int y, int width, int height, int color)
{
    width += x;
    height += y;
    for(;x<width;x++)
    {
        for(;y<height;y++)
        {
            if (x+y*PROJECTIONPLANEWIDTH < PROJECTIONPLANEHEIGHT*PROJECTIONPLANEWIDTH)
                buffer[x+y*PROJECTIONPLANEWIDTH] = color;
        }
    }
}

Answer 3

I fixed this by not using a setPixel, but instead using canvas to draw to the bitmap. However it's dead slow..