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POBitmap not drawn anti-aliased
 

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  1. POBitmap not drawn anti-aliased
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    <p>I have a custom <code>View</code> that always draws a <code>Bitmap</code> at a certain rotation. I overwrite the <code>onDraw</code> method, rotate the <code>Canvas</code> and draw the bitmap with an anti-aliased <code>Paint</code>.</p> <pre><code>public RotatedImageView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); someBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.placeholder); } @Override protected void onDraw(Canvas canvas) { // Save and rotate canvas canvas.save(); canvas.rotate(3F, getWidth() / 2, getHeight()); // Draw the icon Paint p = new Paint(Paint.ANTI_ALIAS_FLAG); canvas.drawBitmap(someBitmap, 0, 0, p); canvas.drawRoundRect(new RectF(75, 50, 225, 200), 10, 10, p); // All done; restore canvas canvas.restore(); } </code></pre> <p>However, I always get jagged edges on the Bitmap. Note that the roudned rectangle gets nicely anti-aliased edges. Also, when I apply <code>p.setFilterBitmap(true);</code> this works (the bitmap surface gets filtered/smoothed) correctly. Am I missing something?</p> <p><img src="https://i.stack.imgur.com/qFxl5.png" alt="No anti-aliasing on the photo"></p> <p>Here's a minimal Android project with isolated example of one screen that shows the View that draws the non-anti-aliased Bitmap, loaded from a resource: <a href="https://bitbucket.org/erickok/antialiastest" rel="noreferrer">https://bitbucket.org/erickok/antialiastest</a></p> <p><strong>UPDATE:</strong> I have also tried the following:</p> <pre><code> Paint p = new Paint(); p.setAntiAlias(true); p.setFilterBitmap(true); p.setDither(true); canvas.drawBitmap(someBitmap, 0, 0, p); </code></pre> <p>But this doesn't help as <code>setFilterBitmap</code> filters the surface; it does not anti-alias the edges. Also, <code>setAntiAlias</code> does the same as directly setting the flag in the <code>Paint</code> constructor. If in doubt, please try my minimal test project. Thanks so much for any help!</p>
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