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Merge display scale changes

This commit is contained in:
Pierre Ossman 2017-02-03 11:56:02 +01:00
parent f6299e0aed
commit a6e52f9a73
1 changed files with 10 additions and 20 deletions
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30
core/display.js
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@ -573,37 +573,22 @@
},
autoscale: function (containerWidth, containerHeight, downscaleOnly) {
var vp = this._viewportLoc;
var targetAspectRatio = containerWidth / containerHeight;
var fbAspectRatio = this._fb_width / this._fb_height;
var fbAspectRatio = vp.w / vp.h;
var scaleRatio;
if (fbAspectRatio >= targetAspectRatio) {
scaleRatio = containerWidth / this._fb_width;
scaleRatio = containerWidth / vp.w;
} else {
scaleRatio = containerHeight / this._fb_height;
scaleRatio = containerHeight / vp.h;
}
var targetW, targetH;
if (scaleRatio > 1.0 && downscaleOnly) {
targetW = this._fb_width;
targetH = this._fb_height;
scaleRatio = 1.0;
} else if (fbAspectRatio >= targetAspectRatio) {
targetW = containerWidth;
targetH = Math.round(containerWidth / fbAspectRatio);
} else {
targetW = Math.round(containerHeight * fbAspectRatio);
targetH = containerHeight;
}
// NB(directxman12): If you set the width directly, or set the
// style width to a number, the canvas is cleared.
// However, if you set the style width to a string
// ('NNNpx'), the canvas is scaled without clearing.
this._target.style.width = targetW + 'px';
this._target.style.height = targetH + 'px';
this._scale = scaleRatio;
this._rescale(scaleRatio);
return scaleRatio; // so that the mouse, etc scale can be set
},
@ -612,6 +597,11 @@
_rescale: function (factor) {
this._scale = factor;
var vp = this._viewportLoc;
// NB(directxman12): If you set the width directly, or set the
// style width to a number, the canvas is cleared.
// However, if you set the style width to a string
// ('NNNpx'), the canvas is scaled without clearing.
this._target.style.width = Math.round(factor * vp.w) + 'px';
this._target.style.height = Math.round(factor * vp.h) + 'px';
},