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    <p>Look into the <code>nme.Memory</code> API. The idea is to create a <code>ByteArray</code> with the correct size (or get it from a <code>BitmapData</code>), select it as the current virtual memory space and manipulate its bytes directly.</p> <p>You'll get an approximately 10x speed boost with Flash and it should be way faster with the CPP target too. <strong>Don't forget to compile in Release mode</strong> or method inlining will be disabled and performances will suffer a lot.</p> <p>Basic usage example (untested code) :</p> <pre class="lang-hx prettyprint-override"><code>var rect:Rectangle = bitmapData.rect; // 32bits integer = 4 bytes var size:Int = bitmapData.width * bitmapData.height * 4; // The virtual memory space we'll use var pixels:ByteArray = new ByteArray(); // CPP does not support setting the length property directly #if (cpp) pixels.setLength(size); #else pixels.length = size; #end // Select the memory space (call it once, not every frame) Memory.select(pixels); // And in your loop set your color // Color is in BGRA mode, nme.Memory can only be used in little endian mode. Memory.setI32((y * width + x) * 4, color); // When you're done, render the BitmapData // (don't forget to reset the ByteArray position) pixels.position = 0; bitmapData.setPixels(rect, pixels); </code></pre> <p>Keep in mind this is a very basic code example. In your case, you'd need to adapt it and actually use a double sized <code>ByteArray</code> because you need to store the iteration count too. Nested loops can be optimized in your main loop and you can avoid a lot of extra index/address computations :</p> <pre class="lang-hx prettyprint-override"><code>// Note the size * 2 ! // First part of the ByteArray will be used to store the iteration count, // the second part to draw the pixels. #if (cpp) pixels.setLength(size * 2); #else pixels.length = size * 2; #end Memory.select(pixels); // First loop storing iteration count for (iy in 0...height) { for (ix in 0...width) { // ... do some stuff ... Memory.setI32((iy * width + ix) &lt;&lt; 2, iteration); } } // In your runLoop : for (i in 0...(height * width)) { // Get the iteration count var pixel:Int = Memory.getI32(i &lt;&lt; 2); r = pixel + colorModifier; g = pixel + colorModifier + r; b = pixel + colorModifier + g; // Note that we're writing the pixel in the second part of our ByteArray Memory.setI32(size + (i &lt;&lt; 2), r | g &lt;&lt; 8 | b &lt;&lt; 16); } // Sets the position to the second part of our ByteArray pixels.position = size; bitmapData.setPixels(rect, pixels); </code></pre> <p>And this is it. If you really don't want to use Alchemy Opcodes on the Flash target, the next fastest way to blit pixels is to use <code>getVector()</code> / <code>setVector()</code> from the <code>BitmapData</code> class. But it's really not as fast.</p>
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