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| goog.provide('ol.renderer.canvas.Layer');
goog.require('goog.array');
goog.require('goog.asserts');
goog.require('goog.vec.Mat4');
goog.require('ol.dom');
goog.require('ol.extent');
goog.require('ol.layer.Layer');
goog.require('ol.render.Event');
goog.require('ol.render.EventType');
goog.require('ol.render.canvas.Immediate');
goog.require('ol.renderer.Layer');
goog.require('ol.vec.Mat4');
/**
* @constructor
* @extends {ol.renderer.Layer}
* @param {ol.layer.Layer} layer Layer.
*/
ol.renderer.canvas.Layer = function(layer) {
goog.base(this, layer);
/**
* @private
* @type {!goog.vec.Mat4.Number}
*/
this.transform_ = goog.vec.Mat4.createNumber();
};
goog.inherits(ol.renderer.canvas.Layer, ol.renderer.Layer);
/**
* @param {olx.FrameState} frameState Frame state.
* @param {ol.layer.LayerState} layerState Layer state.
* @param {CanvasRenderingContext2D} context Context.
*/
ol.renderer.canvas.Layer.prototype.composeFrame =
function(frameState, layerState, context) {
this.dispatchPreComposeEvent(context, frameState);
var image = this.getImage();
Eif (image) {
// clipped rendering if layer extent is set
var extent = layerState.extent;
var clipped = extent !== undefined;
Iif (clipped) {
goog.asserts.assert(extent !== undefined,
'layerState extent is defined');
var pixelRatio = frameState.pixelRatio;
var topLeft = ol.extent.getTopLeft(extent);
var topRight = ol.extent.getTopRight(extent);
var bottomRight = ol.extent.getBottomRight(extent);
var bottomLeft = ol.extent.getBottomLeft(extent);
ol.vec.Mat4.multVec2(frameState.coordinateToPixelMatrix,
topLeft, topLeft);
ol.vec.Mat4.multVec2(frameState.coordinateToPixelMatrix,
topRight, topRight);
ol.vec.Mat4.multVec2(frameState.coordinateToPixelMatrix,
bottomRight, bottomRight);
ol.vec.Mat4.multVec2(frameState.coordinateToPixelMatrix,
bottomLeft, bottomLeft);
context.save();
context.beginPath();
context.moveTo(topLeft[0] * pixelRatio, topLeft[1] * pixelRatio);
context.lineTo(topRight[0] * pixelRatio, topRight[1] * pixelRatio);
context.lineTo(bottomRight[0] * pixelRatio, bottomRight[1] * pixelRatio);
context.lineTo(bottomLeft[0] * pixelRatio, bottomLeft[1] * pixelRatio);
context.clip();
}
var imageTransform = this.getImageTransform();
// for performance reasons, context.save / context.restore is not used
// to save and restore the transformation matrix and the opacity.
// see http://jsperf.com/context-save-restore-versus-variable
var alpha = context.globalAlpha;
context.globalAlpha = layerState.opacity;
// for performance reasons, context.setTransform is only used
// when the view is rotated. see http://jsperf.com/canvas-transform
Eif (frameState.viewState.rotation === 0) {
var dx = goog.vec.Mat4.getElement(imageTransform, 0, 3);
var dy = goog.vec.Mat4.getElement(imageTransform, 1, 3);
var dw = image.width * goog.vec.Mat4.getElement(imageTransform, 0, 0);
var dh = image.height * goog.vec.Mat4.getElement(imageTransform, 1, 1);
context.drawImage(image, 0, 0, +image.width, +image.height,
Math.round(dx), Math.round(dy), Math.round(dw), Math.round(dh));
} else {
context.setTransform(
goog.vec.Mat4.getElement(imageTransform, 0, 0),
goog.vec.Mat4.getElement(imageTransform, 1, 0),
goog.vec.Mat4.getElement(imageTransform, 0, 1),
goog.vec.Mat4.getElement(imageTransform, 1, 1),
goog.vec.Mat4.getElement(imageTransform, 0, 3),
goog.vec.Mat4.getElement(imageTransform, 1, 3));
context.drawImage(image, 0, 0);
context.setTransform(1, 0, 0, 1, 0, 0);
}
context.globalAlpha = alpha;
Iif (clipped) {
context.restore();
}
}
this.dispatchPostComposeEvent(context, frameState);
};
/**
* @param {ol.render.EventType} type Event type.
* @param {CanvasRenderingContext2D} context Context.
* @param {olx.FrameState} frameState Frame state.
* @param {goog.vec.Mat4.Number=} opt_transform Transform.
* @private
*/
ol.renderer.canvas.Layer.prototype.dispatchComposeEvent_ =
function(type, context, frameState, opt_transform) {
var layer = this.getLayer();
Iif (layer.hasListener(type)) {
var transform = opt_transform !== undefined ?
opt_transform : this.getTransform(frameState, 0);
var render = new ol.render.canvas.Immediate(
context, frameState.pixelRatio, frameState.extent, transform,
frameState.viewState.rotation);
var composeEvent = new ol.render.Event(type, layer, render, frameState,
context, null);
layer.dispatchEvent(composeEvent);
render.flush();
}
};
/**
* @param {CanvasRenderingContext2D} context Context.
* @param {olx.FrameState} frameState Frame state.
* @param {goog.vec.Mat4.Number=} opt_transform Transform.
* @protected
*/
ol.renderer.canvas.Layer.prototype.dispatchPostComposeEvent =
function(context, frameState, opt_transform) {
this.dispatchComposeEvent_(ol.render.EventType.POSTCOMPOSE, context,
frameState, opt_transform);
};
/**
* @param {CanvasRenderingContext2D} context Context.
* @param {olx.FrameState} frameState Frame state.
* @param {goog.vec.Mat4.Number=} opt_transform Transform.
* @protected
*/
ol.renderer.canvas.Layer.prototype.dispatchPreComposeEvent =
function(context, frameState, opt_transform) {
this.dispatchComposeEvent_(ol.render.EventType.PRECOMPOSE, context,
frameState, opt_transform);
};
/**
* @param {CanvasRenderingContext2D} context Context.
* @param {olx.FrameState} frameState Frame state.
* @param {goog.vec.Mat4.Number=} opt_transform Transform.
* @protected
*/
ol.renderer.canvas.Layer.prototype.dispatchRenderEvent =
function(context, frameState, opt_transform) {
this.dispatchComposeEvent_(ol.render.EventType.RENDER, context,
frameState, opt_transform);
};
/**
* @return {HTMLCanvasElement|HTMLVideoElement|Image} Canvas.
*/
ol.renderer.canvas.Layer.prototype.getImage = goog.abstractMethod;
/**
* @return {!goog.vec.Mat4.Number} Image transform.
*/
ol.renderer.canvas.Layer.prototype.getImageTransform = goog.abstractMethod;
/**
* @param {olx.FrameState} frameState Frame state.
* @param {number} offsetX Offset on the x-axis in view coordinates.
* @protected
* @return {!goog.vec.Mat4.Number} Transform.
*/
ol.renderer.canvas.Layer.prototype.getTransform =
function(frameState, offsetX) {
var viewState = frameState.viewState;
var pixelRatio = frameState.pixelRatio;
return ol.vec.Mat4.makeTransform2D(this.transform_,
pixelRatio * frameState.size[0] / 2,
pixelRatio * frameState.size[1] / 2,
pixelRatio / viewState.resolution,
-pixelRatio / viewState.resolution,
-viewState.rotation,
-viewState.center[0] + offsetX,
-viewState.center[1]);
};
/**
* @param {olx.FrameState} frameState Frame state.
* @param {ol.layer.LayerState} layerState Layer state.
* @return {boolean} whether composeFrame should be called.
*/
ol.renderer.canvas.Layer.prototype.prepareFrame = goog.abstractMethod;
/**
* @param {ol.Pixel} pixelOnMap Pixel.
* @param {goog.vec.Mat4.Number} imageTransformInv The transformation matrix
* to convert from a map pixel to a canvas pixel.
* @return {ol.Pixel}
* @protected
*/
ol.renderer.canvas.Layer.prototype.getPixelOnCanvas =
function(pixelOnMap, imageTransformInv) {
var pixelOnCanvas = [0, 0];
ol.vec.Mat4.multVec2(imageTransformInv, pixelOnMap, pixelOnCanvas);
return pixelOnCanvas;
};
/**
* @param {ol.Size} size Size.
* @return {boolean} True when the canvas with the current size does not exceed
* the maximum dimensions.
*/
ol.renderer.canvas.Layer.testCanvasSize = (function() {
/**
* @type {CanvasRenderingContext2D}
*/
var context = null;
/**
* @type {ImageData}
*/
var imageData = null;
return function(size) {
Eif (!context) {
context = ol.dom.createCanvasContext2D(1, 1);
imageData = context.createImageData(1, 1);
var data = imageData.data;
data[0] = 42;
data[1] = 84;
data[2] = 126;
data[3] = 255;
}
var canvas = context.canvas;
var good = size[0] <= canvas.width && size[1] <= canvas.height;
Eif (!good) {
canvas.width = size[0];
canvas.height = size[1];
var x = size[0] - 1;
var y = size[1] - 1;
context.putImageData(imageData, x, y);
var result = context.getImageData(x, y, 1, 1);
good = goog.array.equals(imageData.data, result.data);
}
return good;
};
})();
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