Improved text painting for PostScript (including letter-space and word-space)

Moved text-decoration painting to the common base class and reused the border line painting method for this purpose.

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@239925 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/fop/render/AbstractPathOrientedRenderer.java

@@ -19,9 +19,7 @@
 package org.apache.fop.render;
 
 import java.awt.Color;
-import java.awt.geom.AffineTransform;
 import java.awt.geom.Rectangle2D;
-import java.util.Iterator;
 import java.util.List;
 
 import org.apache.fop.area.Area;
@@ -30,11 +28,12 @@ import org.apache.fop.area.BlockViewport;
 import org.apache.fop.area.CTM;
 import org.apache.fop.area.RegionViewport;
 import org.apache.fop.area.Trait;
+import org.apache.fop.area.inline.InlineArea;
 import org.apache.fop.area.inline.Viewport;
 import org.apache.fop.datatypes.ColorType;
+import org.apache.fop.fo.Constants;
+import org.apache.fop.fonts.Typeface;
 import org.apache.fop.image.FopImage;
-import org.apache.fop.pdf.PDFState;
-import org.apache.fop.render.pdf.CTMHelper;
 import org.apache.fop.traits.BorderProps;
 
 /**
@@ -554,6 +553,49 @@ public abstract class AbstractPathOrientedRenderer extends PrintRenderer {
     /** Indicates the end of a text object. */
     protected abstract void endTextObject();
     
+    /**
+     * Paints the text decoration marks.
+     * @param tf Current typeface
+     * @param fontsize Current font size
+     * @param inline inline area to paint the marks for
+     * @param baseline position of the baseline
+     * @param startx start IPD
+     */
+    protected void renderTextDecoration(Typeface tf, int fontsize, InlineArea inline, 
+                    int baseline, int startx) {
+        boolean hasTextDeco = inline.hasUnderline() 
+                || inline.hasOverline() 
+                || inline.hasLineThrough();
+        if (hasTextDeco) {
+            endTextObject();
+            float descender = tf.getDescender(fontsize) / 1000f;
+            float capHeight = tf.getCapHeight(fontsize) / 1000f;
+            float halfLineWidth = (descender / -8f) / 2f;
+            float endx = (startx + inline.getIPD()) / 1000f;
+            if (inline.hasUnderline()) {
+                ColorType ct = (ColorType) inline.getTrait(Trait.UNDERLINE_COLOR);
+                float y = baseline - descender / 2f;
+                drawBorderLine(startx / 1000f, (y - halfLineWidth) / 1000f, 
+                        endx, (y + halfLineWidth) / 1000f, 
+                        true, true, Constants.EN_SOLID, ct);
+            }
+            if (inline.hasOverline()) {
+                ColorType ct = (ColorType) inline.getTrait(Trait.OVERLINE_COLOR);
+                float y = (float)(baseline - (1.1 * capHeight));
+                drawBorderLine(startx / 1000f, (y - halfLineWidth) / 1000f, 
+                        endx, (y + halfLineWidth) / 1000f, 
+                        true, true, Constants.EN_SOLID, ct);
+            }
+            if (inline.hasLineThrough()) {
+                ColorType ct = (ColorType) inline.getTrait(Trait.LINETHROUGH_COLOR);
+                float y = (float)(baseline - (0.45 * capHeight));
+                drawBorderLine(startx / 1000f, (y - halfLineWidth) / 1000f, 
+                        endx, (y + halfLineWidth) / 1000f, 
+                        true, true, Constants.EN_SOLID, ct);
+            }
+        }
+    }
+
     /** Clip using the current path. */
     protected abstract void clip();
         

src/java/org/apache/fop/render/pdf/PDFRenderer.java

@@ -687,6 +687,7 @@ public class PDFRenderer extends AbstractPathOrientedRenderer {
         }
     }
     
+    /** @see org.apache.fop.render.AbstractPathOrientedRenderer#updateLineStyle(int) */
     private void updateLineStyle(int style) {
         switch (style) {
             case Constants.EN_DASHED:
@@ -1037,8 +1038,8 @@ public class PDFRenderer extends AbstractPathOrientedRenderer {
         int size = ((Integer) ch.getTrait(Trait.FONT_SIZE)).intValue();
 
         // This assumes that *all* CIDFonts use a /ToUnicode mapping
-        Typeface f = (Typeface) fontInfo.getFonts().get(name);
-        boolean useMultiByte = f.isMultiByte();
+        Typeface tf = (Typeface) fontInfo.getFonts().get(name);
+        boolean useMultiByte = tf.isMultiByte();
 
         // String startText = useMultiByte ? "<FEFF" : "(";
         String startText = useMultiByte ? "<" : "(";
@@ -1095,7 +1096,7 @@ public class PDFRenderer extends AbstractPathOrientedRenderer {
 
         currentStream.add(pdf.toString());
 
-        renderTextDecoration(fs, ch, bl, rx);
+        renderTextDecoration(tf, size, ch, bl, rx);
         
         super.renderCharacter(ch);
     }
@@ -1111,8 +1112,8 @@ public class PDFRenderer extends AbstractPathOrientedRenderer {
         int size = ((Integer) text.getTrait(Trait.FONT_SIZE)).intValue();
         
         // This assumes that *all* CIDFonts use a /ToUnicode mapping
-        Typeface f = (Typeface) fontInfo.getFonts().get(name);
-        boolean useMultiByte = f.isMultiByte();
+        Typeface tf = (Typeface) fontInfo.getFonts().get(name);
+        boolean useMultiByte = tf.isMultiByte();
 
         // String startText = useMultiByte ? "<FEFF" : "(";
         String startText = useMultiByte ? "<" : "(";
@@ -1166,49 +1167,11 @@ public class PDFRenderer extends AbstractPathOrientedRenderer {
 
         currentStream.add(pdf.toString());
 
-        renderTextDecoration(fs, text, bl, rx);
+        renderTextDecoration(tf, size, text, bl, rx);
         
         super.renderText(text);
     }
     
-    /**
-     * Paints the text decoration marks.
-     * @param fs Current font
-     * @param inline inline area to paint the marks for
-     * @param baseline position of the baseline
-     * @param startx start IPD
-     */
-    protected void renderTextDecoration(Font fs, InlineArea inline, 
-                    int baseline, int startx) {
-        boolean hasTextDeco = inline.hasUnderline() 
-                || inline.hasOverline() 
-                || inline.hasLineThrough();
-        if (hasTextDeco) {
-            endTextObject();
-            updateLineStyle(Constants.EN_SOLID);
-            updateLineWidth(fs.getDescender() / -8 / 1000f);
-            float endx = (startx + inline.getIPD()) / 1000f;
-            if (inline.hasUnderline()) {
-                ColorType ct = (ColorType) inline.getTrait(Trait.UNDERLINE_COLOR);
-                updateColor(ct, false, null);
-                float y = baseline - fs.getDescender() / 2;
-                drawLine(startx / 1000f, y / 1000f, endx, y / 1000f);
-            }
-            if (inline.hasOverline()) {
-                ColorType ct = (ColorType) inline.getTrait(Trait.OVERLINE_COLOR);
-                updateColor(ct, false, null);
-                float y = (float)(baseline - (1.1 * fs.getCapHeight()));
-                drawLine(startx / 1000f, y / 1000f, endx, y / 1000f);
-            }
-            if (inline.hasLineThrough()) {
-                ColorType ct = (ColorType) inline.getTrait(Trait.LINETHROUGH_COLOR);
-                updateColor(ct, false, null);
-                float y = (float)(baseline - (0.45 * fs.getCapHeight()));
-                drawLine(startx / 1000f, y / 1000f, endx, y / 1000f);
-            }
-        }
-    }
-
     /**
      * Escapes text according to PDF rules.
      * @param s Text to escape

src/java/org/apache/fop/render/ps/PSGenerator.java

@@ -46,6 +46,9 @@ public class PSGenerator {
     public static final AtendIndicator ATEND = new AtendIndicator() {
     };
 
+    /** Line feed used by PostScript */
+    public static final char LF = '\n';
+    
     private OutputStream out;
     private boolean commentsEnabled = true;
     
@@ -87,7 +90,7 @@ public class PSGenerator {
      * @throws IOException In case of an I/O problem
      */
     public final void newLine() throws IOException {
-        out.write('\n');
+        out.write(LF);
     }
 
     /**

src/java/org/apache/fop/render/ps/PSRenderer.java

@@ -51,6 +51,7 @@ import org.apache.fop.image.ImageFactory;
 import org.apache.fop.image.XMLImage;
 import org.apache.fop.render.AbstractPathOrientedRenderer;
 import org.apache.fop.render.RendererContext;
+import org.apache.fop.util.CharUtilities;
 
 import org.w3c.dom.Document;
 
@@ -292,7 +293,6 @@ public class PSRenderer extends AbstractPathOrientedRenderer {
 
     /** Restores the last graphics state of the rendering engine. */
     public void restoreGraphicsState() {
-        endTextObject();
         try {
             //delegate
             gen.restoreGraphicsState();
@@ -301,22 +301,6 @@ public class PSRenderer extends AbstractPathOrientedRenderer {
         }
     }
 
-    /** Indicates the beginning of a text object. */
-    protected void beginTextObject() {
-        if (!inTextMode) {
-            writeln("BT");
-            inTextMode = true;
-        }
-    }
-
-    /** Indicates the end of a text object. */
-    protected void endTextObject() {
-        if (inTextMode) {
-            writeln("ET");
-            inTextMode = false;
-        }
-    }
-
     /**
      * Concats the transformation matrix.
      * @param a A part
@@ -365,6 +349,26 @@ public class PSRenderer extends AbstractPathOrientedRenderer {
         gen.useRGBColor(toColor(col));
     }
 
+    /** @see org.apache.fop.render.AbstractPathOrientedRenderer#updateLineStyle(int) */
+    protected void updateLineStyle(int style) {
+        try {
+            switch (style) {
+                case Constants.EN_DASHED:
+                    gen.useDash("[3] 0");
+                    break;
+                case Constants.EN_DOTTED:
+                    gen.useDash("[1 7] 0");
+                    break;
+                default:
+                    // solid
+                    gen.useDash("[] 0");
+                    break;
+            }
+        } catch (IOException ioe) {
+            handleIOTrouble(ioe);
+        }
+    }
+
     /** @see org.apache.fop.render.AbstractPathOrientedRenderer */
     protected void drawBackAndBorders(Area area, float startx, float starty,
             float width, float height) {
@@ -668,31 +672,22 @@ public class PSRenderer extends AbstractPathOrientedRenderer {
         }
     }
     
-    /**
-     * Paints text.
-     * @param rx X coordinate
-     * @param bl Y coordinate
-     * @param text Text to paint
-     * @param font Font to use
-     */
-    protected void paintText(int rx, int bl, String text, Typeface font) {
-        saveGraphicsState();
-        beginTextObject();
-        writeln("1 0 0 -1 " + gen.formatDouble(rx / 1000f) 
-                + " " + gen.formatDouble(bl / 1000f) + " Tm");
+    /** Indicates the beginning of a text object. */
+    protected void beginTextObject() {
+        if (!inTextMode) {
+            saveGraphicsState();
+            writeln("BT");
+            inTextMode = true;
+        }
+    }
 
-        int initialSize = text.length();
-        initialSize += initialSize / 2;
-        StringBuffer sb = new StringBuffer(initialSize);
-        sb.append("(");
-        for (int i = 0; i < text.length(); i++) {
-            final char c = text.charAt(i);
-            final char mapped = font.mapChar(c);
-            PSGenerator.escapeChar(mapped, sb);
+    /** Indicates the end of a text object. */
+    protected void endTextObject() {
+        if (inTextMode) {
+            writeln("ET");
+            restoreGraphicsState();
+            inTextMode = false;
         }
-        sb.append(") t");
-        writeln(sb.toString());
-        restoreGraphicsState();
     }
 
     /**
@@ -703,7 +698,7 @@ public class PSRenderer extends AbstractPathOrientedRenderer {
         int fontsize = area.getTraitAsInteger(Trait.FONT_SIZE);
 
         // This assumes that *all* CIDFonts use a /ToUnicode mapping
-        Typeface f = (Typeface) fontInfo.getFonts().get(fontname);
+        Typeface tf = (Typeface) fontInfo.getFonts().get(fontname);
 
         //Determine position
         int rx = currentIPPosition;
@@ -718,39 +713,56 @@ public class PSRenderer extends AbstractPathOrientedRenderer {
                 handleIOTrouble(ioe);
             }
         }
-        paintText(rx, bl, area.getTextArea(), f);
+        //paintText(rx, bl, , f);
+        String text = area.getTextArea();
+        beginTextObject();
+        writeln("1 0 0 -1 " + gen.formatDouble(rx / 1000f) 
+                + " " + gen.formatDouble(bl / 1000f) + " Tm");
 
-/*
-        String psString = null;
-        if (area.getFontState().getLetterSpacing() > 0) {
-            //float f = area.getFontState().getLetterSpacing()
-            //    * 1000 / this.currentFontSize;
-            float f = area.getFontState().getLetterSpacing();
-            psString = (new StringBuffer().append(f).append(" 0.0 (")
-              .append(sb.toString()).append(") A")).toString();
+        int initialSize = text.length();
+        initialSize += initialSize / 2;
+        StringBuffer sb = new StringBuffer(initialSize);
+        int textLen = text.length();
+        if (area.getTextLetterSpaceAdjust() == 0 && area.getTextWordSpaceAdjust() == 0) {
+            sb.append("(");
+            for (int i = 0; i < textLen; i++) {
+                final char c = text.charAt(i);
+                final char mapped = tf.mapChar(c);
+                PSGenerator.escapeChar(mapped, sb);
+            }
+            sb.append(") t");
         } else {
-            psString = (new StringBuffer("(").append(sb.toString())
-              .append(") t")).toString();
+            sb.append("(");
+            int[] offsets = new int[textLen];
+            for (int i = 0; i < textLen; i++) {
+                final char c = text.charAt(i);
+                final char mapped = tf.mapChar(c);
+                int wordSpace;
+                //TODO Synchronize word space behaviour with TextLayoutManager
+                //Check the other renderers, too!
+                if (CharUtilities.isAnySpace(mapped)
+                        && mapped != CharUtilities.ZERO_WIDTH_SPACE
+                        && mapped != CharUtilities.ZERO_WIDTH_NOBREAK_SPACE) {
+                    wordSpace = area.getTextWordSpaceAdjust();
+                } else {
+                    wordSpace = 0;
+                }
+                int cw = tf.getWidth(mapped, fontsize) / 1000;
+                offsets[i] = cw + area.getTextLetterSpaceAdjust() + wordSpace;
+                PSGenerator.escapeChar(mapped, sb);
+            }
+            sb.append(")" + PSGenerator.LF + "[");
+            for (int i = 0; i < textLen; i++) {
+                if (i > 0) {
+                    sb.append(" ");
+                }
+                sb.append(gen.formatDouble(offsets[i] / 1000f));
+            }
+            sb.append("]" + PSGenerator.LF + "xshow");
         }
+        writeln(sb.toString());
 
-
-        // System.out.println("["+s+"] --> ["+sb.toString()+"]");
-
-        // comment("% --- InlineArea font-weight="+fontWeight+": " + sb.toString());
-        useFont(fs.getFontName(), fs.getFontSize());
-        useColor(area.getRed(), area.getGreen(), area.getBlue());
-        if (area.getUnderlined() || area.getLineThrough()
-                || area.getOverlined())
-            write("ULS");
-        write(psString);
-        if (area.getUnderlined())
-            write("ULE");
-        if (area.getLineThrough())
-            write("SOE");
-        if (area.getOverlined())
-            write("OLE");
-        this.currentXPosition += area.getContentWidth();
-        */
+        renderTextDecoration(tf, fontsize, area, bl, rx);
         super.renderText(area); //Updates IPD
     }