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This is a backport of OpenJFX 8 to run on Java 7.
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/*
 * Copyright (c) 2012, 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.prism.sw;

import java.nio.Buffer;
import java.nio.IntBuffer;
import com.sun.javafx.image.PixelConverter;
import com.sun.javafx.image.PixelGetter;
import com.sun.javafx.image.PixelUtils;
import com.sun.javafx.image.impl.ByteBgraPre;
import com.sun.javafx.image.impl.ByteGray;
import com.sun.javafx.image.impl.ByteRgb;
import com.sun.javafx.image.impl.IntArgbPre;
import com.sun.prism.MediaFrame;
import com.sun.prism.PixelFormat;
import com.sun.prism.Texture;
import com.sun.prism.impl.PrismSettings;

class SWArgbPreTexture extends SWTexture {

    private int data[];
    private int stride, offset;
    private boolean hasAlpha = true;

    SWArgbPreTexture(SWResourceFactory factory, WrapMode wrapMode, int w, int h) {
        super(factory, wrapMode, w, h);
        stride = w;
        offset = 0;
    }

    SWArgbPreTexture(SWArgbPreTexture sharedTex, WrapMode altMode) {
        super(sharedTex, altMode);
        this.data = sharedTex.data;
        this.stride = sharedTex.stride;
        this.offset = sharedTex.offset;
        this.hasAlpha = sharedTex.hasAlpha;
    }

    int[] getDataNoClone() {
        return data;
    }

    int getStride() {
        return stride;
    }

    int getOffset() {
        return offset;
    }

    boolean hasAlpha() {
        return hasAlpha;
    }

    @Override
    public PixelFormat getPixelFormat() {
        return PixelFormat.INT_ARGB_PRE;
    }

    @Override
    public void update(Buffer buffer, PixelFormat format, int dstx, int dsty,
                       int srcx, int srcy, int srcw, int srch, int srcscan, boolean skipFlush)
    {
        if (PrismSettings.debug) {
            System.out.println("ARGB_PRE TEXTURE, Pixel format: " + format + ", buffer: " + buffer);
            System.out.println("dstx:" + dstx + " dsty:" + dsty);
            System.out.println("srcx:" + srcx + " srcy:" + srcy + " srcw:" + srcw + " srch:" + srch + " srcscan: " + srcscan);
        }

        this.checkDimensions(dstx+srcw, dsty+srch);
        this.allocate();

        final PixelGetter getter;
        switch (format) {
            case BYTE_RGB:
                getter = ByteRgb.getter;
                this.hasAlpha = false;
                break;
            case INT_ARGB_PRE:
                getter = IntArgbPre.getter;
                // original srcscan parameter is in bytes, but PixelConverter.convert
                // requires srcscan to be in elements (INTs in this case)
                srcscan = srcscan >> 2;
                this.hasAlpha = true;
                break;
            case BYTE_BGRA_PRE:
                getter = ByteBgraPre.getter;
                this.hasAlpha = true;
                break;
            case BYTE_GRAY:
                getter = ByteGray.getter;
                this.hasAlpha = false;
                break;
            default:
                throw new UnsupportedOperationException("!!! UNSUPPORTED PIXEL FORMAT: " + format);
        }

        PixelConverter converter = PixelUtils.getConverter(getter, IntArgbPre.setter);
        buffer.position(0);
        converter.convert(buffer, (srcy * srcscan) + srcx, srcscan,
                          IntBuffer.wrap(this.data), (dsty * width) + dstx, width, srcw, srch);
    }

    @Override
    public void update(MediaFrame frame, boolean skipFlush) {
        if (PrismSettings.debug) {
            System.out.println("Media Pixel format: " + frame.getPixelFormat());
        }

        frame.holdFrame();

        if (frame.getPixelFormat() != PixelFormat.INT_ARGB_PRE) {
            MediaFrame f = frame.convertToFormat(PixelFormat.INT_ARGB_PRE);
            frame.releaseFrame();
            frame = f;
        }

        IntBuffer ib = frame.getBuffer().asIntBuffer();
        if (ib.hasArray()) {
            this.allocated = false;
            this.data = ib.array();
        } else {
            this.allocate();
            ib.get(this.data);
        }
        this.offset = frame.offsetForPlane(0) / 4;
        this.stride = frame.strideForPlane(0) / 4;

        frame.releaseFrame();
    }

    void checkDimensions(int srcw, int srch) {
        if (srcw < 0) {
            throw new IllegalArgumentException("srcw must be >=0");
        }
        if (srch < 0) {
            throw new IllegalArgumentException("srch must be >=0");
        }
        if (srcw > this.width) {
            throw new IllegalArgumentException("srcw exceeds WIDTH");
        }
        if (srch > this.height) {
            throw new IllegalArgumentException("srch exceeds HEIGHT");
        }
    }

    void applyCompositeAlpha(float alpha) {
        if (allocated) {
            int finalAlpha;
            this.hasAlpha = this.hasAlpha || (alpha < 1f);
            for (int i = 0; i < this.data.length; i++) {
                finalAlpha = ((int)((this.data[i] >> 24) * alpha + 0.5f)) & 0xFF;
                this.data[i] = (finalAlpha << 24) | (this.data[i] & 0xFFFFFF);
            }
        } else {
            throw new IllegalStateException("Cannot apply composite alpha to texture with non-allocated data");
        }
    }

    void allocateBuffer() {
        this.data = new int[width * height];
    }

    Texture createSharedLockedTexture(WrapMode altMode) {
        return new SWArgbPreTexture(this, altMode);
    }
}