--- /dev/null
+/*
+ * Copyright 2004 The Apache Software Foundation.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* $Id$ */
+
+package org.apache.fop.fonts;
+
+// Java
+import java.util.Map;
+
+/**
+ * The FontInfo for the layout and rendering of a fo document.
+ * This stores the list of available fonts that are setup by
+ * the renderer. The font name can be retrieved for the
+ * family style and weight.
+ * <br>
+ * Currently font supported font-variant small-caps is not
+ * implemented.
+ */
+public class FontInfo {
+
+ /** Map containing fonts that have been used */
+ private Map usedFonts;
+
+ /** look up a font-triplet to find a font-name */
+ private Map triplets;
+
+ /** look up a font-name to get a font (that implements FontMetrics at least) */
+ private Map fonts;
+
+ /**
+ * Main constructor
+ */
+ public FontInfo() {
+ this.triplets = new java.util.HashMap();
+ this.fonts = new java.util.HashMap();
+ this.usedFonts = new java.util.HashMap();
+ }
+
+ /**
+ * Checks if the font setup is valid (At least the ultimate fallback font
+ * must be registered.)
+ * @return True if valid
+ */
+ public boolean isSetupValid() {
+ return triplets.containsKey(Font.DEFAULT_FONT);
+ }
+
+ /**
+ * Adds a new font triplet.
+ * @param name internal key
+ * @param family font family name
+ * @param style font style (normal, italic, oblique...)
+ * @param weight font weight
+ */
+ public void addFontProperties(String name, String family, String style,
+ int weight) {
+ /*
+ * add the given family, style and weight as a lookup for the font
+ * with the given name
+ */
+
+ String key = createFontKey(family, style, weight);
+ this.triplets.put(key, name);
+ }
+
+ /**
+ * Adds font metrics for a specific font.
+ * @param name internal key
+ * @param metrics metrics to register
+ */
+ public void addMetrics(String name, FontMetrics metrics) {
+ // add the given metrics as a font with the given name
+
+ this.fonts.put(name, metrics);
+ }
+
+ /**
+ * Lookup a font.
+ * <br>
+ * Locate the font name for a given family, style and weight.
+ * The font name can then be used as a key as it is unique for
+ * the associated document.
+ * This also adds the font to the list of used fonts.
+ * @param family font family
+ * @param style font style
+ * @param weight font weight
+ * @return internal key
+ */
+ public String fontLookup(String family, String style,
+ int weight) {
+ String key;
+ // first try given parameters
+ key = createFontKey(family, style, weight);
+ String f = (String)triplets.get(key);
+ if (f == null) {
+ // then adjust weight, favouring normal or bold
+ f = findAdjustWeight(family, style, weight);
+
+ // then try any family with orig weight
+ if (f == null) {
+ key = createFontKey("any", style, weight);
+ f = (String)triplets.get(key);
+ }
+
+ // then try any family with adjusted weight
+ if (f == null) {
+ f = findAdjustWeight(family, style, weight);
+ }
+
+ // then use default
+ if (f == null) {
+ f = (String)triplets.get(Font.DEFAULT_FONT);
+ }
+
+ }
+
+ usedFonts.put(f, fonts.get(f));
+ return f;
+ }
+
+ /**
+ * Find a font with a given family and style by trying
+ * different font weights according to the spec.
+ * @param family font family
+ * @param style font style
+ * @param weight font weight
+ * @return internal key
+ */
+ public String findAdjustWeight(String family, String style,
+ int weight) {
+ String key;
+ String f = null;
+ int newWeight = weight;
+ if (newWeight < 400) {
+ while (f == null && newWeight > 0) {
+ newWeight -= 100;
+ key = createFontKey(family, style, newWeight);
+ f = (String)triplets.get(key);
+ }
+ } else if (newWeight == 500) {
+ key = createFontKey(family, style, 400);
+ f = (String)triplets.get(key);
+ } else if (newWeight > 500) {
+ while (f == null && newWeight < 1000) {
+ newWeight += 100;
+ key = createFontKey(family, style, newWeight);
+ f = (String)triplets.get(key);
+ }
+ newWeight = weight;
+ while (f == null && newWeight > 400) {
+ newWeight -= 100;
+ key = createFontKey(family, style, newWeight);
+ f = (String)triplets.get(key);
+ }
+ }
+ if (f == null) {
+ key = createFontKey(family, style, 400);
+ f = (String)triplets.get(key);
+ }
+
+ return f;
+ }
+
+ /**
+ * Determines if a particular font is available.
+ * @param family font family
+ * @param style font style
+ * @param weight font weight
+ * @return True if available
+ */
+ public boolean hasFont(String family, String style, int weight) {
+ String key = createFontKey(family, style, weight);
+ return this.triplets.containsKey(key);
+ }
+
+ /**
+ * Creates a key from the given strings.
+ * @param family font family
+ * @param style font style
+ * @param weight font weight
+ * @return internal key
+ */
+ public static String createFontKey(String family, String style,
+ int weight) {
+ return family + "," + style + "," + weight;
+ }
+
+ /**
+ * Gets a Map of all registred fonts.
+ * @return a read-only Map with font key/FontMetrics pairs
+ */
+ public Map getFonts() {
+ return java.util.Collections.unmodifiableMap(this.fonts);
+ }
+
+ /**
+ * This is used by the renderers to retrieve all the
+ * fonts used in the document.
+ * This is for embedded font or creating a list of used fonts.
+ * @return a read-only Map with font key/FontMetrics pairs
+ */
+ public Map getUsedFonts() {
+ return this.usedFonts;
+ }
+
+ /**
+ * Returns the FontMetrics for a particular font
+ * @param fontName internal key
+ * @return font metrics
+ */
+ public FontMetrics getMetricsFor(String fontName) {
+ usedFonts.put(fontName, fonts.get(fontName));
+ return (FontMetrics)fonts.get(fontName);
+ }
+}
+
+
+
projects / xmlgraphics-fop.git / commitdiff