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Make forward and inverse pixel transforms during render

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This commit is contained in:
Tim Schaub
2018-11-17 14:46:38 +01:00
parent db1f432197
commit 686847f491
5 changed files with 46 additions and 18 deletions
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14
src/ol/renderer/canvas/ImageLayer.js
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@@ -6,7 +6,7 @@ import ViewHint from '../../ViewHint.js';
import {containsExtent, intersects} from '../../extent.js';
import {getIntersection, isEmpty} from '../../extent.js';
import CanvasLayerRenderer from './Layer.js';
import {compose as composeTransform, toString as transformToString} from '../../transform.js';
import {compose as composeTransform, makeInverse, toString as transformToString} from '../../transform.js';
/**
* @classdesc
@@ -93,16 +93,17 @@ class CanvasImageLayerRenderer extends CanvasLayerRenderer {
width = height = size;
}
const context = this.context;
const canvas = context.canvas;
const pixelTransform = composeTransform(this.pixelTransform_,
// set forward and inverse pixel transforms
composeTransform(this.pixelTransform_,
frameState.size[0] / 2, frameState.size[1] / 2,
1 / pixelRatio, 1 / pixelRatio,
rotation,
-width / 2, -height / 2
);
const canvasTransform = transformToString(pixelTransform);
makeInverse(this.pixelTransform_, this.inversePixelTransform_);
const context = this.context;
const canvas = context.canvas;
if (canvas.width != width || canvas.height != height) {
canvas.width = width;
@@ -150,6 +151,7 @@ class CanvasImageLayerRenderer extends CanvasLayerRenderer {
canvas.style.opacity = opacity;
}
const canvasTransform = transformToString(this.pixelTransform_);
if (canvasTransform !== canvas.style.transform) {
canvas.style.transform = canvasTransform;
}