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Java example source code file (CompositeFont.java)
The CompositeFont.java Java example source code/* * Copyright (c) 2003, 2006, 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 sun.font; import java.awt.Font; /* Remind: need to enhance to extend component list with a fallback * list, which is not used in metrics or queries on the composite, but * is used in drawing primitives and queries which supply an actual string. * ie for a codepoint that is only in a fallback, font-wide queries such * as FontMetrics.getHeight() will not take it into account. * But getStringBounds(..) would take it into account. * Its fuzzier for queries such as "canDisplay". If this does not include * the fallback, then we probably want to add "canDisplayFallback()" * But its probably OK to include it so long as only composites include * fallbacks. If physicals do then it would be really confusing .. */ public final class CompositeFont extends Font2D { private boolean[] deferredInitialisation; String[] componentFileNames; String[] componentNames; /* because components can be lazily initialised the components field is * private, to ensure all clients call getSlotFont() */ private PhysicalFont[] components; int numSlots; int numMetricsSlots; int[] exclusionRanges; int[] maxIndices; int numGlyphs = 0; int localeSlot = -1; // primary slot for this locale. /* See isStdComposite() for when/how this is used */ boolean isStdComposite = true; public CompositeFont(String name, String[] compFileNames, String[] compNames, int metricsSlotCnt, int[] exclRanges, int[] maxIndexes, boolean defer, SunFontManager fm) { handle = new Font2DHandle(this); fullName = name; componentFileNames = compFileNames; componentNames = compNames; if (compNames == null) { numSlots = componentFileNames.length; } else { numSlots = componentNames.length; } /* Only the first "numMetricsSlots" slots are used for font metrics. * the rest are considered "fallback" slots". */ numMetricsSlots = metricsSlotCnt; exclusionRanges = exclRanges; maxIndices = maxIndexes; /* * See if this is a windows locale which has a system EUDC font. * If so add it as the final fallback component of the composite. * The caller could be responsible for this, but for now it seems * better that it is handled internally to the CompositeFont class. */ if (fm.getEUDCFont() != null) { numSlots++; if (componentNames != null) { componentNames = new String[numSlots]; System.arraycopy(compNames, 0, componentNames, 0, numSlots-1); componentNames[numSlots-1] = fm.getEUDCFont().getFontName(null); } if (componentFileNames != null) { componentFileNames = new String[numSlots]; System.arraycopy(compFileNames, 0, componentFileNames, 0, numSlots-1); } components = new PhysicalFont[numSlots]; components[numSlots-1] = fm.getEUDCFont(); deferredInitialisation = new boolean[numSlots]; if (defer) { for (int i=0; i<numSlots-1; i++) { deferredInitialisation[i] = true; } } } else { components = new PhysicalFont[numSlots]; deferredInitialisation = new boolean[numSlots]; if (defer) { for (int i=0; i<numSlots; i++) { deferredInitialisation[i] = true; } } } fontRank = Font2D.FONT_CONFIG_RANK; int index = fullName.indexOf('.'); if (index>0) { familyName = fullName.substring(0, index); /* composites don't call setStyle() as parsing the style * takes place at the same time as parsing the family name. * Do I really have to parse the style from the name? * Need to look into having the caller provide this. */ if (index+1 < fullName.length()) { String styleStr = fullName.substring(index+1); if ("plain".equals(styleStr)) { style = Font.PLAIN; } else if ("bold".equals(styleStr)) { style = Font.BOLD; } else if ("italic".equals(styleStr)) { style = Font.ITALIC; } else if ("bolditalic".equals(styleStr)) { style = Font.BOLD | Font.ITALIC; } } } else { familyName = fullName; } } /* This method is currently intended to be called only from * FontManager.getCompositeFontUIResource(Font) * It creates a new CompositeFont with the contents of the Physical * one pre-pended as slot 0. */ CompositeFont(PhysicalFont physFont, CompositeFont compFont) { isStdComposite = false; handle = new Font2DHandle(this); fullName = physFont.fullName; familyName = physFont.familyName; style = physFont.style; numMetricsSlots = 1; /* Only the physical Font */ numSlots = compFont.numSlots+1; /* Ugly though it is, we synchronize here on the FontManager class * because it is the lock used to do deferred initialisation. * We need to ensure that the arrays have consistent information. * But it may be possible to dispense with the synchronisation if * it is harmless that we do not know a slot is already initialised * and just need to discover that and mark it so. */ synchronized (FontManagerFactory.getInstance()) { components = new PhysicalFont[numSlots]; components[0] = physFont; System.arraycopy(compFont.components, 0, components, 1, compFont.numSlots); if (compFont.componentNames != null) { componentNames = new String[numSlots]; componentNames[0] = physFont.fullName; System.arraycopy(compFont.componentNames, 0, componentNames, 1, compFont.numSlots); } if (compFont.componentFileNames != null) { componentFileNames = new String[numSlots]; componentFileNames[0] = null; System.arraycopy(compFont.componentFileNames, 0, componentFileNames, 1, compFont.numSlots); } deferredInitialisation = new boolean[numSlots]; deferredInitialisation[0] = false; System.arraycopy(compFont.deferredInitialisation, 0, deferredInitialisation, 1, compFont.numSlots); } } /* This is used for deferred initialisation, so that the components of * a logical font are initialised only when the font is used. * This can have a positive impact on start-up of most UI applications. * Note that this technique cannot be used with a TTC font as it * doesn't know which font in the collection is needed. The solution to * this is that the initialisation checks if the returned font is * really the one it wants by comparing the name against the name that * was passed in (if none was passed in then you aren't using a TTC * as you would have to specify the name in such a case). * Assuming there's only two or three fonts in a collection then it * may be sufficient to verify the returned name is the expected one. * But half the time it won't be. However since initialisation of the * TTC will initialise all its components then just do a findFont2D call * to locate the right one. * This code allows for initialisation of each slot on demand. * There are two issues with this. * 1) All metrics slots probably may be initialised anyway as many * apps will query the overall font metrics. However this is not an * absolute requirement * 2) Some font configuration files on Solaris reference two versions * of a TT font: a Latin-1 version, then a Pan-European version. * One from /usr/openwin/lib/X11/fonts/TrueType, the other from * a euro_fonts directory which is symlinked from numerous locations. * This is difficult to avoid because the two do not share XLFDs so * both will be consequently mapped by separate XLFDs needed by AWT. * The difficulty this presents for lazy initialisation is that if * all the components are not mapped at once, the smaller version may * have been used only to be replaced later, and what is the consequence * for a client that displayed the contents of this font already. * After some thought I think this will not be a problem because when * client tries to display a glyph only in the Euro font, the composite * will ask all components of this font for that glyph and will get * the euro one. Subsequent uses will all come from the 100% compatible * euro one. */ private void doDeferredInitialisation(int slot) { if (deferredInitialisation[slot] == false) { return; } /* Synchronize on FontManager so that is the global lock * to update its static set of deferred fonts. * This global lock is rarely likely to be an issue as there * are only going to be a few calls into this code. */ SunFontManager fm = SunFontManager.getInstance(); synchronized (fm) { if (componentNames == null) { componentNames = new String[numSlots]; } if (components[slot] == null) { /* Warning: it is possible that the returned component is * not derived from the file name argument, this can happen if: * - the file can't be found * - the file has a bad font * - the font in the file is superseded by a more complete one * This should not be a problem for composite font as it will * make no further use of this file, but code debuggers/ * maintainers need to be conscious of this possibility. */ if (componentFileNames != null && componentFileNames[slot] != null) { components[slot] = fm.initialiseDeferredFont(componentFileNames[slot]); } if (components[slot] == null) { components[slot] = fm.getDefaultPhysicalFont(); } String name = components[slot].getFontName(null); if (componentNames[slot] == null) { componentNames[slot] = name; } else if (!componentNames[slot].equalsIgnoreCase(name)) { components[slot] = (PhysicalFont) fm.findFont2D(componentNames[slot], style, FontManager.PHYSICAL_FALLBACK); } } deferredInitialisation[slot] = false; } } /* To called only by FontManager.replaceFont */ void replaceComponentFont(PhysicalFont oldFont, PhysicalFont newFont) { if (components == null) { return; } for (int slot=0; slot<numSlots; slot++) { if (components[slot] == oldFont) { components[slot] = newFont; if (componentNames != null) { componentNames[slot] = newFont.getFontName(null); } } } } public boolean isExcludedChar(int slot, int charcode) { if (exclusionRanges == null || maxIndices == null || slot >= numMetricsSlots) { return false; } int minIndex = 0; int maxIndex = maxIndices[slot]; if (slot > 0) { minIndex = maxIndices[slot - 1]; } int curIndex = minIndex; while (maxIndex > curIndex) { if ((charcode >= exclusionRanges[curIndex]) && (charcode <= exclusionRanges[curIndex+1])) { return true; // excluded } curIndex += 2; } return false; } public void getStyleMetrics(float pointSize, float[] metrics, int offset) { PhysicalFont font = getSlotFont(0); if (font == null) { // possible? super.getStyleMetrics(pointSize, metrics, offset); } else { font.getStyleMetrics(pointSize, metrics, offset); } } public int getNumSlots() { return numSlots; } public PhysicalFont getSlotFont(int slot) { /* This is essentially the runtime overhead for deferred font * initialisation: a boolean test on obtaining a slot font, * which will happen per slot, on initialisation of a strike * (as that is the only frequent call site of this method. */ if (deferredInitialisation[slot]) { doDeferredInitialisation(slot); } SunFontManager fm = SunFontManager.getInstance(); try { PhysicalFont font = components[slot]; if (font == null) { try { font = (PhysicalFont) fm. findFont2D(componentNames[slot], style, FontManager.PHYSICAL_FALLBACK); components[slot] = font; } catch (ClassCastException cce) { font = fm.getDefaultPhysicalFont(); } } return font; } catch (Exception e) { return fm.getDefaultPhysicalFont(); } } FontStrike createStrike(FontStrikeDesc desc) { return new CompositeStrike(this, desc); } /* This is set false when the composite is created using a specified * physical font as the first slot and called by code which * selects composites by locale preferences to know that this * isn't a font which should be adjusted. */ public boolean isStdComposite() { return isStdComposite; } /* This isn't very efficient but its infrequently used. * StandardGlyphVector uses it when the client assigns the glyph codes. * These may not be valid. This validates them substituting the missing * glyph elsewhere. */ protected int getValidatedGlyphCode(int glyphCode) { int slot = glyphCode >>> 24; if (slot >= numSlots) { return getMapper().getMissingGlyphCode(); } int slotglyphCode = glyphCode & CompositeStrike.SLOTMASK; PhysicalFont slotFont = getSlotFont(slot); if (slotFont.getValidatedGlyphCode(slotglyphCode) == slotFont.getMissingGlyphCode()) { return getMapper().getMissingGlyphCode(); } else { return glyphCode; } } public CharToGlyphMapper getMapper() { if (mapper == null) { mapper = new CompositeGlyphMapper(this); } return mapper; } public boolean hasSupplementaryChars() { for (int i=0; i<numSlots; i++) { if (getSlotFont(i).hasSupplementaryChars()) { return true; } } return false; } public int getNumGlyphs() { if (numGlyphs == 0) { numGlyphs = getMapper().getNumGlyphs(); } return numGlyphs; } public int getMissingGlyphCode() { return getMapper().getMissingGlyphCode(); } public boolean canDisplay(char c) { return getMapper().canDisplay(c); } public boolean useAAForPtSize(int ptsize) { /* Find the first slot that supports the default encoding and use * that to decide the "gasp" behaviour of the composite font. * REMIND "default encoding" isn't applicable to a Unicode locale * and we need to replace this with a better mechanism for deciding * if a font "supports" the user's language. See TrueTypeFont.java */ if (localeSlot == -1) { /* Ordinarily check numMetricsSlots, but non-standard composites * set that to "1" whilst not necessarily supporting the default * encoding with that first slot. In such a case check all slots. */ int numCoreSlots = numMetricsSlots; if (numCoreSlots == 1 && !isStdComposite()) { numCoreSlots = numSlots; } for (int slot=0; slot<numCoreSlots; slot++) { if (getSlotFont(slot).supportsEncoding(null)) { localeSlot = slot; break; } } if (localeSlot == -1) { localeSlot = 0; } } return getSlotFont(localeSlot).useAAForPtSize(ptsize); } public String toString() { String ls = (String)java.security.AccessController.doPrivileged( new sun.security.action.GetPropertyAction("line.separator")); String componentsStr = ""; for (int i=0; i<numSlots; i++) { componentsStr += " Slot["+i+"]="+getSlotFont(i)+ls; } return "** Composite Font: Family=" + familyName + " Name=" + fullName + " style=" + style + ls + componentsStr; } } Other Java examples (source code examples)Here is a short list of links related to this Java CompositeFont.java source code file: |
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