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Correct ol.renderer.canvas.ImageLayer transform for HiDPI devices

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This commit is contained in:
Tom Payne
2014-01-08 23:30:14 +01:00
parent 807bf757af
commit 04a0369d68
1 changed files with 9 additions and 7 deletions
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16
src/ol/renderer/canvas/canvasimagelayerrenderer.js
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@@ -64,6 +64,7 @@ ol.renderer.canvas.ImageLayer.prototype.getImageTransform = function() {
ol.renderer.canvas.ImageLayer.prototype.prepareFrame =
function(frameState, layerState) {
var devicePixelRatio = frameState.devicePixelRatio;
var view2DState = frameState.view2DState;
var viewCenter = view2DState.center;
var viewResolution = view2DState.resolution;
@@ -79,7 +80,7 @@ ol.renderer.canvas.ImageLayer.prototype.prepareFrame =
if (!hints[ol.ViewHint.ANIMATING] && !hints[ol.ViewHint.INTERACTING]) {
image = imageSource.getImage(frameState.extent, viewResolution,
frameState.devicePixelRatio, view2DState.projection);
devicePixelRatio, view2DState.projection);
if (!goog.isNull(image)) {
var imageState = image.getState();
if (imageState == ol.ImageState.IDLE) {
@@ -95,16 +96,17 @@ ol.renderer.canvas.ImageLayer.prototype.prepareFrame =
if (!goog.isNull(this.image_)) {
image = this.image_;
var imageExtent = image.getExtent();
var imageResolution = image.getResolution() / image.getPixelRatio();
var devicePixelRatio = frameState.devicePixelRatio;
var imageResolution = image.getResolution();
var imagePixelRatio = image.getPixelRatio();
var scale = devicePixelRatio * imageResolution /
(viewResolution * imagePixelRatio);
ol.vec.Mat4.makeTransform2D(this.imageTransform_,
devicePixelRatio * frameState.size[0] / 2,
devicePixelRatio * frameState.size[1] / 2,
devicePixelRatio * imageResolution / viewResolution,
devicePixelRatio * imageResolution / viewResolution,
scale, scale,
viewRotation,
(imageExtent[0] - viewCenter[0]) / imageResolution,
(viewCenter[1] - imageExtent[3]) / imageResolution);
imagePixelRatio * (imageExtent[0] - viewCenter[0]) / imageResolution,
imagePixelRatio * (viewCenter[1] - imageExtent[3]) / imageResolution);
this.updateAttributions(frameState.attributions, image.getAttributions());
this.updateLogos(frameState, imageSource);
}