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POUsing Hardware Layer in Custom View onDraw
 

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    <p>So I'm trying to understand how I can properly use hardware acceleration (when available) in a custom <code>View</code> that is persistently animating. This is the basic premise of my <code>onDraw()</code>:</p> <pre><code>canvas.drawColor(mBackgroundColor); for (Layer layer : mLayers) { canvas.save(); canvas.translate(layer.x, layer.y); //Draw that number of images in a grid, offset by -1 for (int i = -1; i &lt; layer.xCount - 1; i++) { for (int j = -1; j &lt; layer.yCount - 1; j++) { canvas.drawBitmap(layer.bitmap, layer.w * i, layer.h * j, null); } } //If the layer's x has moved past its width, reset back to a seamless position layer.x += ((difference * layer.xSpeed) / 1000f); float xOverlap = layer.x % layer.w; if (xOverlap &gt; 0) { layer.x = xOverlap; } //If the layer's y has moved past its height, reset back to a seamless position layer.y += ((difference * layer.ySpeed) / 1000f); float yOverlap = layer.y % layer.h; if (yOverlap &gt; 0) { layer.y = yOverlap; } canvas.restore(); } //Redraw the view ViewCompat.postInvalidateOnAnimation(this); </code></pre> <p>I'm enabling hardware layers in <code>onAttachedToWindow()</code> and disabling them in <code>onDetachedFromWindow()</code>, but I'm trying to understand whether or not I'm actually using it. Essentially, the <code>i/j</code> loop that calls <code>drawBitmap()</code> never changes; the only thing that changes is the <code>Canvas</code> translation. Is the <code>Bitmap</code> automatically saved to the GPU as a texture behind the scenes, or is there something I need to do manually to do so?</p>
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    1. COI might have misunderstood the question but have you set `setLayerType(View.LAYER_TYPE_HARDWARE, null);` for your view? The GPU Caches the images only as long as the user is actively scrolling but does not otherwise, as a tradeoff for consuming lesser resources.
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    2. CO@Slartibartfast Yeah, I've set the layer type to hardware. The user will never actually be scrolling; the view is scrolling its own contents continuously. I might be misunderstanding HW Acceleration, but I feel like that grid of bitmaps I'm drawing should be able to be rendered into a hardware layer and just translated rather than redrawing the bitmaps on every frame.
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