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Optimizes sprite performance by reusing Paint objects

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This commit is contained in:
Viktor Lidholt 2015-07-28 09:36:21 -07:00
parent 0041182dc8
commit bc49645960
1 changed files with 6 additions and 5 deletions
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11
packages/flutter/example/game/lib/sprite.dart
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@ -29,6 +29,8 @@ class Sprite extends NodeWithSize {
/// mySprite.transferMode = TransferMode.plusMode;
TransferMode transferMode;
Paint _cachedPaint = new Paint();
/// Creates a new sprite from the provided [texture].
///
/// var mySprite = new Sprite(myTexture)
@ -94,17 +96,16 @@ class Sprite extends NodeWithSize {
canvas.scale(scaleX, scaleY);
// Setup paint object for opacity and transfer mode
Paint paint = new Paint();
paint.color = new Color.fromARGB((255.0*_opacity).toInt(), 255, 255, 255);
_cachedPaint.color = new Color.fromARGB((255.0*_opacity).toInt(), 255, 255, 255);
if (colorOverlay != null) {
paint.setColorFilter(new ColorFilter.mode(colorOverlay, TransferMode.srcATop));
_cachedPaint.setColorFilter(new ColorFilter.mode(colorOverlay, TransferMode.srcATop));
}
if (transferMode != null) {
paint.setTransferMode(transferMode);
_cachedPaint.setTransferMode(transferMode);
}
// Do actual drawing of the sprite
texture.drawTexture(canvas, Point.origin, paint);
texture.drawTexture(canvas, Point.origin, _cachedPaint);
} else {
// Paint a red square for missing texture
canvas.drawRect(new Rect.fromLTRB(0.0, 0.0, size.width, size.height),