playn.html.HtmlCanvasImage.java Source code

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Here is the source code for playn.html.HtmlCanvasImage.java

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/**
 * Copyright 2010 The PlayN Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package playn.html;

import com.google.gwt.canvas.dom.client.CanvasPixelArray;
import com.google.gwt.canvas.dom.client.Context2d;
import com.google.gwt.canvas.dom.client.ImageData;

import playn.core.Canvas;
import playn.core.CanvasImage;
import playn.core.Image;
import playn.core.gl.GLContext;
import playn.core.gl.Scale;

class HtmlCanvasImage extends HtmlImage implements CanvasImage {

    private HtmlCanvas canvas;

    public HtmlCanvasImage(GLContext ctx, Scale scale, HtmlCanvas canvas) {
        super(ctx, scale, canvas.canvas());
        this.canvas = canvas;
        canvas.scale(scale.factor, scale.factor);
    }

    @Override
    public Canvas canvas() {
        return canvas;
    }

    @Override
    public Image snapshot() {
        return this; // TODO
    }

    @Override
    public int ensureTexture(boolean repeatX, boolean repeatY) {
        if (canvas.dirty()) {
            canvas.clearDirty();
            clearTexture();
        }
        return super.ensureTexture(repeatX, repeatY);
    }

    @Override
    public void setRgb(int startX, int startY, int width, int height, int[] rgbArray, int offset, int scanSize) {
        Context2d ctx = canvas.canvas().getContext2d();
        ImageData imageData = ctx.getImageData(startX, startY, width, height);
        CanvasPixelArray pixelData = imageData.getData();
        int i = 0;
        int dst = offset;
        for (int y = 0; y < height; y++) {
            for (int x = 0; x < width; x++) {
                int rgba = rgbArray[dst + x];
                pixelData.set(i++, (rgba >> 16) & 255);
                pixelData.set(i++, (rgba >> 8) & 255);
                pixelData.set(i++, (rgba) & 255);
                pixelData.set(i++, (rgba >> 24) & 255);
            }
            dst += scanSize;
        }
    }
}