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Merge pull request #441 from vlidholt/master

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Optimizes drawing performance in sprites
This commit is contained in:
Viktor Lidholt 2015-08-04 10:19:43 -07:00
commit 3e6ace0420
2 changed files with 17 additions and 13 deletions
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4
sky/packages/sky/example/game/lib/sprite.dart
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@ -29,7 +29,9 @@ class Sprite extends NodeWithSize {
/// mySprite.transferMode = TransferMode.plusMode;
TransferMode transferMode;
Paint _cachedPaint = new Paint();
Paint _cachedPaint = new Paint()
..setFilterQuality(FilterQuality.low)
..isAntiAlias = false;
/// Creates a new sprite from the provided [texture].
///

26
sky/packages/sky/example/game/lib/texture.dart
View File

@ -74,17 +74,18 @@ class Texture {
}
void drawTexture(PaintingCanvas canvas, Point position, Paint paint) {
// Account for position
// Get drawing position
double x = position.x;
double y = position.y;
bool translate = (x != 0 || y != 0);
if (translate) {
canvas.translate(x, y);
}
// Draw the texture
if (rotated) {
// Account for position
bool translate = (x != 0 || y != 0);
if (translate) {
canvas.translate(x, y);
}
// Calculate the rotated frame and spriteSourceSize
Size originalFrameSize = frame.size;
Rect rotatedFrame = frame.topLeft & new Size(originalFrameSize.height, originalFrameSize.width);
@ -97,14 +98,15 @@ class Texture {
canvas.rotate(-math.PI/2.0);
canvas.drawImageRect(image, rotatedFrame, rotatedSpriteSourceSize, paint);
canvas.rotate(math.PI/2.0);
// Translate back
if (translate) {
canvas.translate(-x, -y);
}
} else {
// Draw the sprite
canvas.drawImageRect(image, frame, spriteSourceSize, paint);
}
// Translate back
if (translate) {
canvas.translate(-x, -y);
Rect dstRect = new Rect.fromLTWH(x + spriteSourceSize.left, y + spriteSourceSize.top, spriteSourceSize.width, spriteSourceSize.height);
canvas.drawImageRect(image, frame, dstRect, paint);
}
}
}