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Fix WebGL image layer rendering on retina displays

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This commit takes the device pixel ratio into account when calculating the matrix used to apply the image to the output canvas.
This commit is contained in:
Éric Lemoine
2015-04-01 10:40:27 +02:00
parent 0789604e88
commit 9ce3bc7f3d
2 changed files with 21 additions and 15 deletions
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22
test/spec/ol/renderer/webgl/webglimagelayerrenderer.test.js
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@@ -6,6 +6,7 @@ describe('ol.renderer.webgl.ImageLayer', function() {
var renderer;
var canvasWidth;
var canvasHeight;
var pixelRatio;
var viewResolution;
var viewRotation;
var viewCenter;
@@ -27,6 +28,7 @@ describe('ol.renderer.webgl.ImageLayer', function() {
// input params
canvasWidth = 512;
canvasHeight = 256;
pixelRatio = 2;
viewResolution = 10;
viewRotation = 0;
viewCenter = [7680, 3840];
@@ -44,7 +46,7 @@ describe('ol.renderer.webgl.ImageLayer', function() {
it('produces a correct matrix', function() {
renderer.updateProjectionMatrix_(canvasWidth, canvasHeight,
viewCenter, viewResolution, viewRotation, imageExtent);
pixelRatio, viewCenter, viewResolution, viewRotation, imageExtent);
var matrix = renderer.getProjectionMatrix();
var input;
@@ -52,27 +54,27 @@ describe('ol.renderer.webgl.ImageLayer', function() {
input = goog.vec.Vec4.createFromValues(-1, -1, 0, 1);
goog.vec.Mat4.multVec4(matrix, input, output);
expect(output[0]).to.eql(-3);
expect(output[1]).to.eql(-3);
expect(output[0]).to.eql(-6);
expect(output[1]).to.eql(-6);
input = goog.vec.Vec4.createFromValues(1, -1, 0, 1);
goog.vec.Mat4.multVec4(matrix, input, output);
expect(output[0]).to.eql(1);
expect(output[1]).to.eql(-3);
expect(output[0]).to.eql(2);
expect(output[1]).to.eql(-6);
input = goog.vec.Vec4.createFromValues(-1, 1, 0, 1);
goog.vec.Mat4.multVec4(matrix, input, output);
expect(output[0]).to.eql(-3);
expect(output[1]).to.eql(3);
expect(output[0]).to.eql(-6);
expect(output[1]).to.eql(6);
input = goog.vec.Vec4.createFromValues(1, 1, 0, 1);
goog.vec.Mat4.multVec4(matrix, input, output);
expect(output[0]).to.eql(1);
expect(output[1]).to.eql(3);
expect(output[0]).to.eql(2);
expect(output[1]).to.eql(6);
input = goog.vec.Vec4.createFromValues(0, 0, 0, 1);
goog.vec.Mat4.multVec4(matrix, input, output);
expect(output[0]).to.eql(-1);
expect(output[0]).to.eql(-2);
expect(output[1]).to.eql(0);
});
});