ashatora/openlayers
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Support for image or pixel operations

Browse Source
This commit is contained in:
Tim Schaub
2015-06-25 16:20:13 -06:00
parent 23e2fcefef
commit a721ce03c9
3 changed files with 86 additions and 29 deletions
Download Patch File Download Diff File Expand all files Collapse all files

67
src/ol/source/rastersource.js
View File

@@ -13,6 +13,7 @@ goog.require('ol.extent');
goog.require('ol.layer.Image');
goog.require('ol.layer.Tile');
goog.require('ol.raster.IdentityOp');
goog.require('ol.raster.OperationType');
goog.require('ol.renderer.canvas.ImageLayer');
goog.require('ol.renderer.canvas.TileLayer');
goog.require('ol.source.Image');
@@ -41,6 +42,13 @@ ol.source.Raster = function(options) {
this.operations_ = goog.isDef(options.operations) ?
options.operations : [ol.raster.IdentityOp];
/**
* @private
* @type {ol.raster.OperationType}
*/
this.operationType_ = goog.isDef(options.operationType) ?
options.operationType : ol.raster.OperationType.PIXEL;
/**
* @private
* @type {Array.<ol.renderer.canvas.Layer>}
@@ -215,29 +223,36 @@ ol.source.Raster.prototype.composeFrame_ = function(frameState) {
this.renderers_[i], frameState, frameState.layerStatesArray[i]);
}
var targetImageData = context.getImageData(0, 0, canvas.width, canvas.height);
var target = targetImageData.data;
var resolution = frameState.viewState.resolution / frameState.pixelRatio;
this.dispatchEvent(new ol.source.RasterEvent(
ol.source.RasterEventType.BEFOREOPERATIONS, resolution));
var source, pixel;
for (var j = 0, jj = target.length; j < jj; j += 4) {
for (var k = 0; k < len; ++k) {
source = imageDatas[k].data;
pixel = pixels[k];
pixel[0] = source[j];
pixel[1] = source[j + 1];
pixel[2] = source[j + 2];
pixel[3] = source[j + 3];
var targetImageData = null;
if (this.operationType_ === ol.raster.OperationType.PIXEL) {
targetImageData = context.getImageData(0, 0, canvas.width,
canvas.height);
var target = targetImageData.data;
var source, pixel;
for (var j = 0, jj = target.length; j < jj; j += 4) {
for (var k = 0; k < len; ++k) {
source = imageDatas[k].data;
pixel = pixels[k];
pixel[0] = source[j];
pixel[1] = source[j + 1];
pixel[2] = source[j + 2];
pixel[3] = source[j + 3];
}
pixel = this.runPixelOperations_(pixels)[0];
target[j] = pixel[0];
target[j + 1] = pixel[1];
target[j + 2] = pixel[2];
target[j + 3] = pixel[3];
}
pixel = this.runOperations_(pixels)[0];
target[j] = pixel[0];
target[j + 1] = pixel[1];
target[j + 2] = pixel[2];
target[j + 3] = pixel[3];
} else if (this.operationType_ === ol.raster.OperationType.IMAGE) {
targetImageData = this.runImageOperations_(imageDatas)[0];
} else {
goog.asserts.fail('unsupported operation type: ' + this.operationType_);
}
this.dispatchEvent(new ol.source.RasterEvent(
@@ -255,7 +270,7 @@ ol.source.Raster.prototype.composeFrame_ = function(frameState) {
* @return {Array.<ol.raster.Pixel>} The modified pixels.
* @private
*/
ol.source.Raster.prototype.runOperations_ = function(pixels) {
ol.source.Raster.prototype.runPixelOperations_ = function(pixels) {
for (var i = 0, ii = this.operations_.length; i < ii; ++i) {
pixels = this.operations_[i](pixels);
}
@@ -263,6 +278,20 @@ ol.source.Raster.prototype.runOperations_ = function(pixels) {
};
/**
* Run image operations.
* @param {Array.<ImageData>} imageDatas The input image data.
* @return {Array.<ImageData>} The output image data.
* @private
*/
ol.source.Raster.prototype.runImageOperations_ = function(imageDatas) {
for (var i = 0, ii = this.operations_.length; i < ii; ++i) {
imageDatas = this.operations_[i](imageDatas);
}
return imageDatas;
};
/**
* Get image data from a renderer.
* @param {ol.renderer.canvas.Layer} renderer Layer renderer.