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Avoid copyPixels for full-sheet frames. #23

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Avoid copyPixels for full-sheet frames. #23

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35 changes: 25 additions & 10 deletions spritesheet/Spritesheet.hx
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Original file line number Diff line number Diff line change
Expand Up @@ -80,20 +80,35 @@ class Spritesheet {

var frame = frames[index];

var bitmapData = new BitmapData (frame.width, frame.height, true);
var sourceRectangle = new Rectangle (frame.x, frame.y, frame.width, frame.height);
var targetPoint = new Point ();

bitmapData.copyPixels (sourceImage, sourceRectangle, targetPoint);

if (sourceImageAlpha != null) {
if ( ( frame.x == 0 ) &&
( frame.y == 0 ) &&
( frame.width == sourceImage.width ) &&
( frame.height == sourceImage.height ) &&
( sourceImageAlpha == null ) ) {

// This is the full source image, and no alpha needs to be merged in;
// just reference directly.
//trace( "Spritesheet.generateBitmap: full sheet reused for " + name + " frame " + index );
frame.bitmapData = sourceImage;

} else {

var bitmapData = new BitmapData (frame.width, frame.height, true);
var sourceRectangle = new Rectangle (frame.x, frame.y, frame.width, frame.height);
var targetPoint = new Point ();

bitmapData.copyChannel (sourceImageAlpha, sourceRectangle, targetPoint, 2, 8);
bitmapData.copyPixels (sourceImage, sourceRectangle, targetPoint);

if (sourceImageAlpha != null) {

bitmapData.copyChannel (sourceImageAlpha, sourceRectangle, targetPoint, 2, 8);

}

frame.bitmapData = bitmapData;

}

frame.bitmapData = bitmapData;

}


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