1 /*
   2  * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package com.sun.javafx.font.directwrite;
  27 
  28 import com.sun.javafx.font.PrismFontFactory;
  29 import com.sun.javafx.font.PrismFontFile;
  30 import com.sun.javafx.text.GlyphLayout;
  31 
  32 public class DWFactory extends PrismFontFactory {
  33 
  34     /* Factories (Singletons) */
  35     private static IDWriteFactory DWRITE_FACTORY = null;
  36     private static IDWriteFontCollection FONT_COLLECTION = null;
  37     private static IWICImagingFactory WIC_FACTORY = null;
  38     private static ID2D1Factory D2D_FACTORY = null;
  39     private static Thread d2dThread;
  40 
  41     public static PrismFontFactory getFactory() {
  42         /* DirectWrite is not available on Windows Vista SP2 (JFX minimal
  43          * requirement on Windows) without 'Platform Update'.
  44          * To workaround this limitation this method first checks if a
  45          * IDWriteFactory can be created. The DWriteCreateFactory is a dynamic
  46          * method which fails gracefully (returns NULL) when the system does
  47          * not support DirectWrite.
  48          */
  49         if (getDWriteFactory() == null) {
  50             /* Returning null here indicates to the PrismFontFactory
  51              * to throw an Error . */
  52             return null;
  53         }
  54         return new DWFactory();
  55     }
  56 
  57     private DWFactory() {
  58     }
  59 
  60     @Override
  61     protected PrismFontFile createFontFile(String name, String filename,
  62                                            int fIndex, boolean register,
  63                                            boolean embedded, boolean copy,
  64                                            boolean tracked) throws Exception {
  65         return new DWFontFile(name, filename, fIndex, register,
  66                               embedded, copy, tracked);
  67     }
  68 
  69     @Override public GlyphLayout createGlyphLayout() {
  70         return new DWGlyphLayout();
  71     }
  72 
  73     @Override
  74     protected boolean registerEmbeddedFont(String path) {
  75         IDWriteFactory factory = DWFactory.getDWriteFactory();
  76         IDWriteFontFile fontFile = factory.CreateFontFileReference(path);
  77         if (fontFile == null) return false;
  78         boolean[] isSupportedFontType = new boolean[1];
  79         int[] fontFileType = new int[1];
  80         int[] fontFaceType = new int[1];
  81         int[] numberOfFaces = new int[1];
  82         int hr = fontFile.Analyze(isSupportedFontType, fontFileType, fontFaceType, numberOfFaces);
  83         fontFile.Release();
  84         if (hr != OS.S_OK) return false;
  85         return isSupportedFontType[0];
  86     }
  87 
  88     static IDWriteFactory getDWriteFactory() {
  89         /* Using multi threaded DWrite factory as the JFX thread requires access
  90          * to DWrite resources for measuring and the Prism thread for rendering */
  91         if (DWRITE_FACTORY == null) {
  92             DWRITE_FACTORY = OS.DWriteCreateFactory(OS.DWRITE_FACTORY_TYPE_SHARED);
  93         }
  94         return DWRITE_FACTORY;
  95     }
  96 
  97     static IDWriteFontCollection getFontCollection() {
  98         if (FONT_COLLECTION == null) {
  99             FONT_COLLECTION = getDWriteFactory().GetSystemFontCollection(false);
 100         }
 101         return FONT_COLLECTION;
 102     }
 103 
 104     private static void checkThread() {
 105         /* Note: It is possible for the correct thread to acquire the factory and
 106          * hand it over to some other thread. This would be a programming error
 107          * and it is not check by this implementation. */
 108         Thread current = Thread.currentThread();
 109         if (d2dThread == null) {
 110             d2dThread = current;
 111         }
 112         if (d2dThread != current) {
 113             throw new IllegalStateException(
 114                     "This operation is not permitted on the current thread ["
 115                     + current.getName() + "]");
 116         }
 117     }
 118 
 119     static synchronized IWICImagingFactory getWICFactory() {
 120         checkThread();
 121         /* Using single threaded WIC Factory as it should only be used by the rendering thread */
 122         if (WIC_FACTORY == null) {
 123             WIC_FACTORY = OS.WICCreateImagingFactory();
 124         }
 125         return WIC_FACTORY;
 126     }
 127 
 128     static synchronized ID2D1Factory getD2DFactory() {
 129         checkThread();
 130         /* Using single threaded D2D Factory as it should only be used by the rendering thread */
 131         if (D2D_FACTORY == null) {
 132             D2D_FACTORY = OS.D2D1CreateFactory(OS.D2D1_FACTORY_TYPE_SINGLE_THREADED);
 133         }
 134         return D2D_FACTORY;
 135     }
 136 }