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This is a backport of OpenJFX 8 to run on Java 7.
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/*
 * Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.sun.javafx.tk.quantum;

import java.nio.IntBuffer;

import com.sun.glass.ui.Application;
import com.sun.glass.ui.Pixels;
import com.sun.glass.ui.View;
import com.sun.prism.Graphics;
import com.sun.prism.GraphicsPipeline;
import com.sun.prism.RTTexture;
import com.sun.prism.Texture.WrapMode;
import com.sun.prism.impl.BufferUtil;
import com.sun.prism.impl.Disposer;
import com.sun.prism.impl.ManagedResource;
import com.sun.prism.impl.PrismSettings;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * UploadingPainter is used when we need to render into an offscreen buffer.
 * The PresentingPainter is used when we are rendering to the main screen.
 */
final class UploadingPainter extends ViewPainter implements Runnable {

    private Application app = Application.GetApplication();
    private Pixels      pix;
    private IntBuffer   textureBits; // Used for RTTs that are not backed by a SW array
    private IntBuffer   pixBits; // Users for RTTs that are backed by a SW array
    private final AtomicInteger uploadCount = new AtomicInteger(0);
    private RTTexture   rttexture;

    UploadingPainter(GlassScene view) {
        super(view);
    }

    void disposeRTTexture() {
        if (rttexture != null) {
            rttexture.dispose();
            rttexture = null;
        }
    }

    @Override public void run() {
        renderLock.lock();

        boolean locked = false;

        try {
            valid = validateStageGraphics();

            if (!valid) {
                if (QuantumToolkit.verbose) {
                    System.err.println("UploadingPainter: validateStageGraphics failed");
                }
                return;
            }

            /*
             * As Glass is responsible for creating the rendering contexts,
             * locking should be done prior to the Prism calls.
             */
            sceneState.lock();
            locked = true;
            
            if (factory == null) {
                factory = GraphicsPipeline.getDefaultResourceFactory();
                if (factory == null || !factory.isDeviceReady()) {
                    return;
                }
            }

            boolean needsReset = (rttexture == null) || (viewWidth != penWidth) || (viewHeight != penHeight);

            if (!needsReset) {
                rttexture.lock();
                if (rttexture.isSurfaceLost()) {
                    rttexture.unlock();
                    needsReset = true;
                }
            }

            if (needsReset) {
                disposeRTTexture();
                rttexture = factory.createRTTexture(viewWidth, viewHeight, WrapMode.CLAMP_NOT_NEEDED);
                if (rttexture == null) {
                    return;
                }
                penWidth    = viewWidth;
                penHeight   = viewHeight;
                textureBits = null;
                pixBits = null;
            }
            Graphics g = rttexture.createGraphics();
            if (g == null) {
                disposeRTTexture();
                sceneState.getScene().entireSceneNeedsRepaint();
                return;
            }
            paintImpl(g);

            int rawbits[] = rttexture.getPixels();

            if (rawbits != null) {
                if (pixBits == null || uploadCount.get() > 0) {
                    pixBits = IntBuffer.allocate(viewWidth * viewHeight);
                }
                System.arraycopy(rawbits, 0, pixBits.array(), 0, viewWidth * viewHeight);
                pix = app.createPixels(viewWidth, viewHeight, pixBits);
            } else {
                if (textureBits == null || uploadCount.get() > 0) {
                    textureBits = BufferUtil.newIntBuffer(viewWidth * viewHeight);
                }
                
                if (textureBits != null) {
                    if (rttexture.readPixels(textureBits)) {
                        pix = app.createPixels(viewWidth, viewHeight, textureBits);
                    } else {
                        /* device lost */
                        sceneState.getScene().entireSceneNeedsRepaint();
                        disposeRTTexture();
                        pix = null;
                    }
                }
            }

            if (rttexture != null) {
                rttexture.unlock();
            }

            if (pix != null) {
                /* transparent pixels created and ready for upload */
                // Copy references, which are volatile, used by upload. Thus
                // ensure they still exist once event queue is consumed.
                uploadCount.incrementAndGet();
                sceneState.uploadPixels(pix, uploadCount);
            }
                
        } catch (Throwable th) {
            th.printStackTrace(System.err);
        } finally {
            if (valid) {
                Disposer.cleanUp();
            }
            if (locked) {
                sceneState.unlock();
            }

            sceneState.getScene().setPainting(false);
            if (PrismSettings.poolStats ||
                ManagedResource.anyLockedResources())
            {
                ManagedResource.printSummary();
            }
            renderLock.unlock();
        }
    }
}