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Cache image size.

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This commit is contained in:
Gunther Brunner
2014-02-19 22:27:28 +09:00
parent a2a00736b6
commit 3cdb0c7c1a
1 changed files with 29 additions and 8 deletions
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37
res/app/components/stf/screen/screen-directive.js
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@@ -15,6 +15,14 @@ module.exports = function DeviceScreenDirective($document, ScalingService) {
device.display.width
, device.display.height
)
, cached = {
displayWidth: 0,
displayHeight: 0,
canvasStyleWidth: 0,
canvasStyleHeight: 0,
imageWidth: 0,
imageHeight: 0
}
function updateDisplaySize() {
displayWidth = element[0].offsetWidth
@@ -36,16 +44,29 @@ module.exports = function DeviceScreenDirective($document, ScalingService) {
}
loader.onload = function () {
var size = scaler.projectedSize(displayWidth, displayHeight)
// Make sure we're rendering pixels 1 to 1
canvas.width = this.width
canvas.height = this.height
// Sets the size only if updated
if (cached.displayWidth !== displayWidth ||
cached.displayHeight !== displayHeight ||
cached.imageWidth !== this.width ||
cached.imageHeight !== this.height
) {
cached.displayWidth = displayWidth
cached.displayHeight = displayHeight
cached.imageWidth = this.width
cached.imageHeight = this.height
// Perhaps we have a massive screen but not enough pixels. Let's
// scale up
canvas.style.width = size.width + 'px'
canvas.style.height = size.height + 'px'
var size = scaler.projectedSize(displayWidth, displayHeight)
// Make sure we're rendering pixels 1 to 1
canvas.width = this.width
canvas.height = this.height
// Perhaps we have a massive screen but not enough pixels. Let's
// scale up
canvas.style.width = size.width + 'px'
canvas.style.height = size.height + 'px'
}
// Draw the image
g.drawImage(this, 0, 0)