/*
 * Copyright (c) 2011, 2015, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */

package com.sun.javafx.webkit.prism;

import com.sun.prism.CompositeMode;
import com.sun.prism.Graphics;
import com.sun.prism.GraphicsPipeline;
import com.sun.prism.Image;
import com.sun.prism.PixelFormat;
import com.sun.prism.PrinterGraphics;
import com.sun.prism.RTTexture;
import com.sun.prism.ResourceFactory;
import com.sun.prism.ResourceFactoryListener;
import com.sun.prism.Texture;
import com.sun.prism.paint.Color;
import com.sun.prism.paint.Paint;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.IntBuffer;

/**
 * @author Alexey.Ushakov
 */
final class RTImage extends PrismImage implements ResourceFactoryListener {
    private RTTexture txt;
    private final int width, height;
    private boolean listenerAdded = false;
    private ByteBuffer pixelBuffer;
    private float pixelScale;

    RTImage(int w, int h, float pixelScale) {
        width = w;
        height = h;
        this.pixelScale = pixelScale;
    }

    @Override
    Image getImage() {
         return Image.fromByteBgraPreData(
                getPixelBuffer(),
                getWidth(), getHeight());
    }

    @Override
    Graphics getGraphics() {
        Graphics g = getTexture().createGraphics();
        g.transform(PrismGraphicsManager.getPixelScaleTransform());
        return g;
    }

    private RTTexture getTexture() {
        if (txt == null) {
            ResourceFactory f = GraphicsPipeline.getDefaultResourceFactory();
            txt = f.createRTTexture(
                    (int) Math.ceil(width * pixelScale),
                    (int) Math.ceil(height * pixelScale),
                    Texture.WrapMode.CLAMP_NOT_NEEDED);
            txt.contentsUseful();
            txt.makePermanent();
            if (! listenerAdded) {
                f.addFactoryListener(this);
                listenerAdded = true;
            }
        }
        return txt;
    }

    @Override
    void draw(Graphics g,
            int dstx1, int dsty1, int dstx2, int dsty2,
            int srcx1, int srcy1, int srcx2, int srcy2)
    {
        if (txt == null && g.getCompositeMode() == CompositeMode.SRC_OVER) {
            return;
        }
        if (g instanceof PrinterGraphics) {
            // We're printing. Copy [txt] into a J2DTexture and draw it.
            int w = srcx2 - srcx1;
            int h = srcy2 - srcy1;
            final IntBuffer pixels = IntBuffer.allocate(w * h);

            PrismInvoker.runOnRenderThread(() -> {
                getTexture().readPixels(pixels);
            });
            Image img = Image.fromIntArgbPreData(pixels, w, h);
            Texture t = g.getResourceFactory().createTexture(
                    img, Texture.Usage.STATIC, Texture.WrapMode.CLAMP_NOT_NEEDED);
            g.drawTexture(t,
                    dstx1, dsty1, dstx2, dsty2,
                    0, 0, w, h);
            t.dispose();
        } else {
            if (txt == null) {
                Paint p = g.getPaint();
                g.setPaint(Color.TRANSPARENT);
                g.fillQuad(dstx1, dsty1, dstx2, dsty2);
                g.setPaint(p);

            } else {
                g.drawTexture(txt,
                    dstx1, dsty1, dstx2, dsty2,
                    srcx1 * pixelScale, srcy1 * pixelScale,
                    srcx2 * pixelScale, srcy2 * pixelScale);
            }
        }
    }

    @Override
    void dispose() {
        PrismInvoker.invokeOnRenderThread(() -> {
            if (txt != null) {
                txt.dispose();
                txt = null;
            }
        });
    }

    @Override
    public int getWidth() {
        return width;
    }

    @Override
    public int getHeight() {
        return height;
    }

    @Override
    public ByteBuffer getPixelBuffer() {
        boolean isNew = false;
        if (pixelBuffer == null) {
            pixelBuffer = ByteBuffer.allocateDirect(width*height*4);
            if (pixelBuffer != null) {
                pixelBuffer.order(ByteOrder.nativeOrder());
                isNew = true;
            }
        }
        if (isNew || isDirty()) {
            PrismInvoker.runOnRenderThread(() -> {
                flushRQ();
                if (txt != null && pixelBuffer != null) {
                    PixelFormat pf = txt.getPixelFormat();
                    if (pf != PixelFormat.INT_ARGB_PRE &&
                        pf != PixelFormat.BYTE_BGRA_PRE) {

                        throw new AssertionError("Unexpected pixel format: " + pf);
                    }

                    RTTexture t = txt;
                    if (pixelScale != 1.0f) {
                        // Convert [txt] to a texture the size of the image
                        ResourceFactory f = GraphicsPipeline.getDefaultResourceFactory();
                        t = f.createRTTexture(width, height, Texture.WrapMode.CLAMP_NOT_NEEDED);
                        Graphics g = t.createGraphics();
                        g.drawTexture(txt, 0, 0, width, height,
                                0, 0, width * pixelScale, height * pixelScale);
                    }

                    pixelBuffer.rewind();
                    int[] pixels = t.getPixels();
                    if (pixels != null) {
                        pixelBuffer.asIntBuffer().put(pixels);
                    } else {
                        t.readPixels(pixelBuffer);
                    }

                    if (t != txt) {
                        t.dispose();
                    }
                }
            });
        }
        return pixelBuffer;
    }

    // This method is called from native [ImageBufferData::update]
    // while lazy painting procedure
    @Override
    protected void drawPixelBuffer() {
        PrismInvoker.invokeOnRenderThread(new Runnable() {
            public void run() {
                //[g] field can be null if it is the first paint
                //from synthetic ImageData.
                Graphics g = getGraphics();
                if (g != null && pixelBuffer != null) {
                    pixelBuffer.rewind();//critical!
                    Image img = Image.fromByteBgraPreData(
                            pixelBuffer,
                            width,
                            height);
                    Texture txt = g.getResourceFactory().createTexture(img, Texture.Usage.DEFAULT, Texture.WrapMode.CLAMP_NOT_NEEDED);
                    g.clear();
                    g.drawTexture(txt, 0, 0, width, height);
                    txt.dispose();
                }
            }
        });
    }

    @Override public void factoryReset() {
        if (txt != null) {
            txt.dispose();
            txt = null;
        }
    }

    @Override public void factoryReleased() {
    }

    @Override
    public float getPixelScale() {
        return pixelScale;
    }
}
