/*
 * Copyright (c) 2004, 2018, 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
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 */
package sun.awt;

import java.awt.RenderingHints;
import static java.awt.RenderingHints.*;
import java.awt.color.ColorSpace;
import java.awt.image.*;
import java.security.AccessController;
import java.security.PrivilegedAction;

import sun.security.action.GetIntegerAction;
import com.sun.java.swing.plaf.gtk.GTKConstants.TextDirection;
import sun.java2d.opengl.OGLRenderQueue;
import sun.security.action.GetPropertyAction;

public abstract class UNIXToolkit extends SunToolkit
{
    
All calls into GTK should be synchronized on this lock /** All calls into GTK should be synchronized on this lock */
    public static final Object GTK_LOCK = new Object();

    private static final int[] BAND_OFFSETS = { 0, 1, 2 };
    private static final int[] BAND_OFFSETS_ALPHA = { 0, 1, 2, 3 };
    private static final int DEFAULT_DATATRANSFER_TIMEOUT = 10000;

    // Allowed GTK versions
    public enum GtkVersions {
        ANY(0),
        GTK2(Constants.GTK2_MAJOR_NUMBER),
        GTK3(Constants.GTK3_MAJOR_NUMBER);

        static class Constants {
            static final int GTK2_MAJOR_NUMBER = 2;
            static final int GTK3_MAJOR_NUMBER = 3;
        }

        final int number;

        GtkVersions(int number) {
            this.number = number;
        }

        public static GtkVersions getVersion(int number) {
            switch (number) {
                case Constants.GTK2_MAJOR_NUMBER:
                    return GTK2;
                case Constants.GTK3_MAJOR_NUMBER:
                    return GTK3;
                default:
                    return ANY;
            }
        }

        // major GTK version number
        public int getNumber() {
            return number;
        }
    };

    private Boolean nativeGTKAvailable;
    private Boolean nativeGTKLoaded;
    private BufferedImage tmpImage = null;

    public static int getDatatransferTimeout() {
        Integer dt = AccessController.doPrivileged(
                new GetIntegerAction("sun.awt.datatransfer.timeout"));
        if (dt == null || dt <= 0) {
            return DEFAULT_DATATRANSFER_TIMEOUT;
        } else {
            return dt;
        }
    }

    
Returns true if the native GTK libraries are capable of being
loaded and are expected to work properly, false otherwise.  Note
that this method will not leave the native GTK libraries loaded if
they haven't already been loaded.  This allows, for example, Swing's
GTK L&F to test for the presence of native GTK support without
leaving the native libraries loaded.  To attempt long-term loading
of the native GTK libraries, use the loadGTK() method instead.
/**
     * Returns true if the native GTK libraries are capable of being
     * loaded and are expected to work properly, false otherwise.  Note
     * that this method will not leave the native GTK libraries loaded if
     * they haven't already been loaded.  This allows, for example, Swing's
     * GTK L&F to test for the presence of native GTK support without
     * leaving the native libraries loaded.  To attempt long-term loading
     * of the native GTK libraries, use the loadGTK() method instead.
     */
    @Override
    public boolean isNativeGTKAvailable() {
        synchronized (GTK_LOCK) {
            if (nativeGTKLoaded != null) {
                // We've already attempted to load GTK, so just return the
                // status of that attempt.
                return nativeGTKLoaded;

            } else if (nativeGTKAvailable != null) {
                // We've already checked the availability of the native GTK
                // libraries, so just return the status of that attempt.
                return nativeGTKAvailable;

            } else {
                boolean success = check_gtk(getEnabledGtkVersion().getNumber());
                nativeGTKAvailable = success;
                return success;
            }
        }
    }

    
Loads the GTK libraries, if necessary.  The first time this method
is called, it will attempt to load the native GTK library.  If
successful, it leaves the library open and returns true; otherwise,
the library is left closed and returns false.  On future calls to
this method, the status of the first attempt is returned (a simple
lightweight boolean check, no native calls required).
/**
     * Loads the GTK libraries, if necessary.  The first time this method
     * is called, it will attempt to load the native GTK library.  If
     * successful, it leaves the library open and returns true; otherwise,
     * the library is left closed and returns false.  On future calls to
     * this method, the status of the first attempt is returned (a simple
     * lightweight boolean check, no native calls required).
     */
    public boolean loadGTK() {
        synchronized (GTK_LOCK) {
            if (nativeGTKLoaded == null) {
                nativeGTKLoaded = load_gtk(getEnabledGtkVersion().getNumber(),
                                                                isGtkVerbose());
            }
        }
        return nativeGTKLoaded;
    }

    
Overridden to handle GTK icon loading
/**
     * Overridden to handle GTK icon loading
     */
    @Override
    protected Object lazilyLoadDesktopProperty(String name) {
        if (name.startsWith("gtk.icon.")) {
            return lazilyLoadGTKIcon(name);
        }
        return super.lazilyLoadDesktopProperty(name);
    }

    
Load a native Gtk stock icon.
Params:
longname – a desktop property name. This contains icon name, size and orientation, e.g. "gtk.icon.gtk-add.4.rtl"
Returns:
an Image for the icon, or null if the icon could not be loaded/**
     * Load a native Gtk stock icon.
     *
     * @param longname a desktop property name. This contains icon name, size
     *        and orientation, e.g. {@code "gtk.icon.gtk-add.4.rtl"}
     * @return an {@code Image} for the icon, or {@code null} if the
     *         icon could not be loaded
     */
    protected Object lazilyLoadGTKIcon(String longname) {
        // Check if we have already loaded it.
        Object result = desktopProperties.get(longname);
        if (result != null) {
            return result;
        }

        // We need to have at least gtk.icon.<stock_id>.<size>.<orientation>
        String[] str = longname.split("\\.");
        if (str.length != 5) {
            return null;
        }

        // Parse out the stock icon size we are looking for.
        int size = 0;
        try {
            size = Integer.parseInt(str[3]);
        } catch (NumberFormatException nfe) {
            return null;
        }

        // Direction.
        TextDirection dir = ("ltr".equals(str[4]) ? TextDirection.LTR :
                                                    TextDirection.RTL);

        // Load the stock icon.
        BufferedImage img = getStockIcon(-1, str[2], size, dir.ordinal(), null);
        if (img != null) {
            // Create the desktop property for the icon.
            setDesktopProperty(longname, img);
        }
        return img;
    }

    
Returns a BufferedImage which contains the Gtk icon requested.  If no
such icon exists or an error occurs loading the icon the result will
be null.
Params:
filename – 
Returns:
The icon or null if it was not found or loaded./**
     * Returns a BufferedImage which contains the Gtk icon requested.  If no
     * such icon exists or an error occurs loading the icon the result will
     * be null.
     *
     * @param filename
     * @return The icon or null if it was not found or loaded.
     */
    public BufferedImage getGTKIcon(final String filename) {
        if (!loadGTK()) {
            return null;

        } else {
            // Call the native method to load the icon.
            synchronized (GTK_LOCK) {
                if (!load_gtk_icon(filename)) {
                    tmpImage = null;
                }
            }
        }
        // Return local image the callback loaded the icon into.
        return tmpImage;
    }

    
Returns a BufferedImage which contains the Gtk stock icon requested.
If no such stock icon exists the result will be null.
Params:
widgetType – one of WidgetType values defined in GTKNativeEngine or
-1 for system default stock icon.
stockId – String which defines the stock id of the gtk item.
For a complete list reference the API at www.gtk.org for StockItems.
iconSize – One of the GtkIconSize values defined in GTKConstants
direction – One of the TextDirection values defined in
GTKConstants
detail – Render detail that is passed to the native engine (feel
free to pass null)
Returns:
The stock icon or null if it was not found or loaded./**
     * Returns a BufferedImage which contains the Gtk stock icon requested.
     * If no such stock icon exists the result will be null.
     *
     * @param widgetType one of WidgetType values defined in GTKNativeEngine or
     * -1 for system default stock icon.
     * @param stockId String which defines the stock id of the gtk item.
     * For a complete list reference the API at www.gtk.org for StockItems.
     * @param iconSize One of the GtkIconSize values defined in GTKConstants
     * @param direction One of the TextDirection values defined in
     * GTKConstants
     * @param detail Render detail that is passed to the native engine (feel
     * free to pass null)
     * @return The stock icon or null if it was not found or loaded.
     */
    public BufferedImage getStockIcon(final int widgetType, final String stockId,
                                final int iconSize, final int direction,
                                final String detail) {
        if (!loadGTK()) {
            return null;

        } else {
            // Call the native method to load the icon.
            synchronized (GTK_LOCK) {
                if (!load_stock_icon(widgetType, stockId, iconSize, direction, detail)) {
                    tmpImage = null;
                }
            }
        }
        // Return local image the callback loaded the icon into.
        return tmpImage;  // set by loadIconCallback
    }

    
This method is used by JNI as a callback from load_stock_icon.
Image data is passed back to us via this method and loaded into the
local BufferedImage and then returned via getStockIcon.
Do NOT call this method directly.
/**
     * This method is used by JNI as a callback from load_stock_icon.
     * Image data is passed back to us via this method and loaded into the
     * local BufferedImage and then returned via getStockIcon.
     *
     * Do NOT call this method directly.
     */
    public void loadIconCallback(byte[] data, int width, int height,
            int rowStride, int bps, int channels, boolean alpha) {
        // Reset the stock image to null.
        tmpImage = null;

        // Create a new BufferedImage based on the data returned from the
        // JNI call.
        DataBuffer dataBuf = new DataBufferByte(data, (rowStride * height));
        // Maybe test # channels to determine band offsets?
        WritableRaster raster = Raster.createInterleavedRaster(dataBuf,
                width, height, rowStride, channels,
                (alpha ? BAND_OFFSETS_ALPHA : BAND_OFFSETS), null);
        ColorModel colorModel = new ComponentColorModel(
                ColorSpace.getInstance(ColorSpace.CS_sRGB), alpha, false,
                ColorModel.TRANSLUCENT, DataBuffer.TYPE_BYTE);

        // Set the local image so we can return it later from
        // getStockIcon().
        tmpImage = new BufferedImage(colorModel, raster, false, null);
    }

    private static native boolean check_gtk(int version);
    private static native boolean load_gtk(int version, boolean verbose);
    private static native boolean unload_gtk();
    private native boolean load_gtk_icon(String filename);
    private native boolean load_stock_icon(int widget_type, String stock_id,
            int iconSize, int textDirection, String detail);

    private native void nativeSync();
    private static native int get_gtk_version();

    @Override
    public void sync() {
        // flush the X11 buffer
        nativeSync();
        // now flush the OGL pipeline (this is a no-op if OGL is not enabled)
        OGLRenderQueue.sync();
    }

    /*
     * This returns the value for the desktop property "awt.font.desktophints"
     * It builds this by querying the Gnome desktop properties to return
     * them as platform independent hints.
     * This requires that the Gnome properties have already been gathered.
     */
    public static final String FONTCONFIGAAHINT = "fontconfig/Antialias";

    @Override
    protected RenderingHints getDesktopAAHints() {

        Object aaValue = getDesktopProperty("gnome.Xft/Antialias");

        if (aaValue == null) {
            /* On a KDE desktop running KWin the rendering hint will
             * have been set as property "fontconfig/Antialias".
             * No need to parse further in this case.
             */
            aaValue = getDesktopProperty(FONTCONFIGAAHINT);
            if (aaValue != null) {
               return new RenderingHints(KEY_TEXT_ANTIALIASING, aaValue);
            } else {
                 return null; // no Gnome or KDE Desktop properties available.
            }
        }

        /* 0 means off, 1 means some ON. What would any other value mean?
         * If we require "1" to enable AA then some new value would cause
         * us to default to "OFF". I don't think that's the best guess.
         * So if its !=0 then lets assume AA.
         */
        boolean aa = ((aaValue instanceof Number)
                        && ((Number) aaValue).intValue() != 0);
        Object aaHint;
        if (aa) {
            String subpixOrder =
                (String)getDesktopProperty("gnome.Xft/RGBA");

            if (subpixOrder == null || subpixOrder.equals("none")) {
                aaHint = VALUE_TEXT_ANTIALIAS_ON;
            } else if (subpixOrder.equals("rgb")) {
                aaHint = VALUE_TEXT_ANTIALIAS_LCD_HRGB;
            } else if (subpixOrder.equals("bgr")) {
                aaHint = VALUE_TEXT_ANTIALIAS_LCD_HBGR;
            } else if (subpixOrder.equals("vrgb")) {
                aaHint = VALUE_TEXT_ANTIALIAS_LCD_VRGB;
            } else if (subpixOrder.equals("vbgr")) {
                aaHint = VALUE_TEXT_ANTIALIAS_LCD_VBGR;
            } else {
                /* didn't recognise the string, but AA is requested */
                aaHint = VALUE_TEXT_ANTIALIAS_ON;
            }
        } else {
            aaHint = VALUE_TEXT_ANTIALIAS_DEFAULT;
        }
        return new RenderingHints(KEY_TEXT_ANTIALIASING, aaHint);
    }

    private native boolean gtkCheckVersionImpl(int major, int minor,
        int micro);

    
Returns true if the GTK+ library is compatible with the given version. 
Params:
major – 
           The required major version.
minor – 
           The required minor version.
micro – 
           The required micro version.
Returns:
true if the GTK+ library is compatible with the given version./**
     * Returns {@code true} if the GTK+ library is compatible with the given
     * version.
     *
     * @param major
     *            The required major version.
     * @param minor
     *            The required minor version.
     * @param micro
     *            The required micro version.
     * @return {@code true} if the GTK+ library is compatible with the given
     *         version.
     */
    public boolean checkGtkVersion(int major, int minor, int micro) {
        if (loadGTK()) {
            return gtkCheckVersionImpl(major, minor, micro);
        }
        return false;
    }

    public static GtkVersions getEnabledGtkVersion() {
        String version = AccessController.doPrivileged(
                new GetPropertyAction("jdk.gtk.version"));
        if (version == null) {
            return GtkVersions.ANY;
        } else if (version.startsWith("2")) {
            return GtkVersions.GTK2;
        } else if("3".equals(version) ){
            return GtkVersions.GTK3;
        }
        return GtkVersions.ANY;
    }

    public static GtkVersions getGtkVersion() {
        return GtkVersions.getVersion(get_gtk_version());
    }

    public static boolean isGtkVerbose() {
        return AccessController.doPrivileged((PrivilegedAction<Boolean>)()
                -> Boolean.getBoolean("jdk.gtk.verbose"));
    }
}