net.npe.gwt.canvas.CanvasCreator.java Source code

Introduction

Here is the source code for net.npe.gwt.canvas.CanvasCreator.java

Source

/*
 * CanvasCreator.java
 * 
 * Copyright (c) 2015 Kenji Sasaki
 * Released under the MIT license.
 * https://github.com/npedotnet/NPESDK_GWT/blob/master/LICENSE
 * 
 * English document
 * https://github.com/npedotnet/NPESDK_GWT/blob/master/README.md
 * 
 * Japanese document
 * http://3dtech.jp/wiki/index.php?NPESDK_GWT
 * 
 */

package net.npe.gwt.canvas;

import java.io.IOException;

import net.npe.dds.DDSReader;
import net.npe.tga.TGAReader;

import com.google.gwt.canvas.client.Canvas;
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 com.google.gwt.typedarrays.client.Uint8ArrayNative;
import com.google.gwt.typedarrays.shared.ArrayBuffer;

public class CanvasCreator {

    public enum ImageType {
        DDS, TGA,
    }

    public static Canvas createImageCanvas(ArrayBuffer arrayBuffer, ImageType type) {
        Uint8ArrayNative u8array = Uint8ArrayNative.create(arrayBuffer);
        byte[] buffer = new byte[u8array.length()];
        for (int i = 0; i < buffer.length; i++) {
            buffer[i] = (byte) u8array.get(i);
        }
        return createImageCanvas(buffer, type);
    }

    public static Canvas createImageCanvas(byte[] buffer, ImageType type) {
        if (type == ImageType.DDS) {
            int[] pixels = DDSReader.read(buffer, DDSReader.ABGR, 0);
            int width = DDSReader.getWidth(buffer);
            int height = DDSReader.getHeight(buffer);
            return createImageCanvas(pixels, width, height);
        } else if (type == ImageType.TGA) {
            try {
                int[] pixels = TGAReader.read(buffer, TGAReader.ABGR);
                int width = TGAReader.getWidth(buffer);
                int height = TGAReader.getHeight(buffer);
                return createImageCanvas(pixels, width, height);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return null;
    }

    public static Canvas createImageCanvas(int[] pixels, int width, int height) {

        Canvas canvas = Canvas.createIfSupported();

        if (canvas == null)
            return null;

        canvas.setCoordinateSpaceWidth(width);
        canvas.setCoordinateSpaceHeight(height);

        Context2d context = canvas.getContext2d();
        ImageData data = context.createImageData(width, height);

        CanvasPixelArray array = data.getData();
        for (int i = 0; i < width * height; i++) { // ABGR
            array.set(4 * i + 0, pixels[i] & 0xFF);
            array.set(4 * i + 1, (pixels[i] >> 8) & 0xFF);
            array.set(4 * i + 2, (pixels[i] >> 16) & 0xFF);
            array.set(4 * i + 3, (pixels[i] >> 24) & 0xFF);
        }
        context.putImageData(data, 0, 0);

        return canvas;

    }

}