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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/java/awt/font/GNUGlyphVector.java | |
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Diffstat (limited to 'libjava/classpath/gnu/java/awt/font/GNUGlyphVector.java')
-rw-r--r-- | libjava/classpath/gnu/java/awt/font/GNUGlyphVector.java | 663 |
1 files changed, 663 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/awt/font/GNUGlyphVector.java b/libjava/classpath/gnu/java/awt/font/GNUGlyphVector.java new file mode 100644 index 000000000..9fd80e79e --- /dev/null +++ b/libjava/classpath/gnu/java/awt/font/GNUGlyphVector.java @@ -0,0 +1,663 @@ +/* GNUGlyphVector.java -- The GNU implementation of GlyphVector. + Copyright (C) 2006 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath 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 for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + +package gnu.java.awt.font; + +import gnu.java.awt.java2d.ShapeWrapper; + +import java.awt.Font; +import java.awt.font.FontRenderContext; +import java.awt.font.GlyphMetrics; +import java.awt.font.GlyphJustificationInfo; +import java.awt.font.GlyphVector; + +import java.awt.Shape; +import java.awt.geom.AffineTransform; +import java.awt.geom.GeneralPath; +import java.awt.geom.Point2D; +import java.awt.geom.Rectangle2D; + + +/** + * The GNU implementation of the abstract GlyphVector class, which + * uses the services provided by a FontDelegate for its functionality. + * + * @author Sascha Brawer (brawer@dandelis.ch) + */ +public class GNUGlyphVector + extends GlyphVector +{ + private FontDelegate fontDelegate; + private Font font; + private FontRenderContext renderContext; + private int[] glyphs; + private float fontSize; + private AffineTransform transform; + private boolean valid; + + + /** + * The position of each glyph. The horizontal position of the + * <code>i</code>-th glyph is at <code>pos[i * 2]</code>, its + * vertical position at <code>pos[i * 2 + 1]</code>. The total + * advance width of the entire vector is stored at + * <code>pos[numGlyphs]</code>, the total advance height at + * <code>pos[numGlyphs + 1]</code>. + */ + private float[] pos; + + + private AffineTransform[] transforms; + private int layoutFlags; + + /** + * The cached non-transformed outline of this glyph vector. + */ + private Shape cleanOutline; + + /** + * Constructs a new GNUGlyphVector. + * + * @param fontDelegate the FontDelegate that creates this vector. + * + * @param font the Font that this GlyphVector will return for {@link + * #getFont()}. That object is also used to determine the point + * size, which affects the affine transformation used by the font + * scaler. + * + * @param renderContext an object with parameters for font + * rendering, such as whether anti-aliasing is enabled. + * + * @param glyphs the glyphs in this vector. + */ + public GNUGlyphVector(FontDelegate fontDelegate, + Font font, + FontRenderContext renderContext, + int[] glyphs) + { + this.fontDelegate = fontDelegate; + this.font = font; + this.renderContext = renderContext; + this.glyphs = glyphs; + + fontSize = font.getSize2D(); + transform = font.getTransform(); // returns a modifiable copy + //transform.concatenate(renderContext.getTransform()); + } + + + + /** + * Returns the font of the glyphs in this GlyphVector. + */ + public Font getFont() + { + return font; + } + + + /** + * Returns the FontRenderContext that is used to calculate the + * extent and position of the glyphs. + */ + public FontRenderContext getFontRenderContext() + { + return renderContext; + } + + + /** + * Moves each glyph in the vector to its default position. + */ + public void performDefaultLayout() + { + float x, y, advanceWidth, advanceHeight; + int i, p; + AffineTransform tx; + Point2D.Float advance = new Point2D.Float(); + + pos = new float[(glyphs.length + 1) * 2]; + x = y = 0.0f; + p = 0; + for (i = p = 0; i < glyphs.length; i++) + { + p += 2; + + if ((transforms == null) || (tx = transforms[i]) == null) + tx = this.transform; + else + { + tx = new AffineTransform(tx); + tx.concatenate(this.transform); + } + + fontDelegate.getAdvance(glyphs[i], fontSize, tx, + renderContext.isAntiAliased(), + renderContext.usesFractionalMetrics(), + /* horizontal */ true, + advance); + // FIXME: We shouldn't round here, but instead hint the metrics + // correctly. + pos[p] = x += Math.round(advance.x); + pos[p + 1] = y += advance.y; + } + valid = true; + } + + + /** + * Determines the number of glyphs in this GlyphVector. + */ + public int getNumGlyphs() + { + return glyphs.length; + } + + + /** + * Determines the glyph number by index in this vector. + * Glyph numbers are specific to each font, so two fonts + * will likely assign different numbers to the same glyph. + * + * @param glyphIndex the index of the glyph whose glyph number is to + * be retrieved. + * + * @throws IndexOutOfBoundsException if <code>glyphIndex</code> + * is not in the range <code[0 .. getNumGlyphs() - 1]</code>. + */ + public int getGlyphCode(int glyphIndex) + { + /* The exception is thrown automatically if the index is out + * of the valid bounds. + */ + return glyphs[glyphIndex]; + } + + + /** + * Returns a slice of this GlyphVector. + * + * @param firstGlyphIndex the index of the first glyph in the + * returned slice. + * + * @param numEntries the size of the returned slice. + * + * @param outCodes a pre-allocated array for storing the slice, + * or <code>null</code> to cause allocation of a new array. + * + * @return a slice of this GlyphVector. If <code>outCodes</code> + * is <code>null</code>, the slice will be stored into a freshly + * allocated array; otherwise, the result will be stored into + * <code>outCodes</code>. + */ + public int[] getGlyphCodes(int firstGlyphIndex, + int numEntries, + int[] outCodes) + { + if (numEntries < 0) + throw new IllegalArgumentException(); + if (outCodes == null) + outCodes = new int[numEntries]; + System.arraycopy(glyphs, firstGlyphIndex, outCodes, 0, numEntries); + return outCodes; + } + + + public Rectangle2D getLogicalBounds() + { + float ascent, descent; + + validate(); + + return new Rectangle2D.Float(0, 0, + pos[pos.length - 2], + getAscent() - getDescent()); + } + + + public Rectangle2D getVisualBounds() + { + validate(); + + // FIXME: Not yet implemented. + return getLogicalBounds(); + } + + + /** + * Returns the shape of this GlyphVector. + */ + public Shape getOutline() + { + return getOutline(0.0f, 0.0f); + } + + + /** + * Returns the shape of this GlyphVector, translated to the + * specified position. + * + * @param x the horizontal position for rendering this vector. + * @param y the vertical position for rendering this vector. + */ + public Shape getOutline(float x, float y) + { + validate(); + + Shape outline; + if (cleanOutline == null) + { + GeneralPath path = new GeneralPath(); + int len = glyphs.length; + for (int i = 0; i < len; i++) + { + GeneralPath p = new GeneralPath(getGlyphOutline(i)); + path.append(p, false); + } + // Protect the cached instance from beeing modified by application + // code. + cleanOutline = new ShapeWrapper(path); + outline = cleanOutline; + } + else + { + outline = cleanOutline; + } + if (x != 0 || y != 0) + { + GeneralPath path = new GeneralPath(outline); + AffineTransform t = new AffineTransform(); + t.translate(x, y); + path.transform(t); + outline = path; + } + return outline; + } + + public Shape getOutline(float x, float y, int type) + { + validate(); + + GeneralPath outline = new GeneralPath(); + int len = glyphs.length; + for (int i = 0; i < len; i++) + { + GeneralPath p = new GeneralPath(getGlyphOutline(i, type)); + outline.append(p, false); + } + AffineTransform t = new AffineTransform(); + t.translate(x, y); + outline.transform(t); + return outline; + } + + /** + * Determines the shape of the specified glyph. + * + * @throws IndexOutOfBoundsException if <code>glyphIndex</code> is + * not in the range <code[0 .. getNumGlyphs()]</code>. + */ + public Shape getGlyphOutline(int glyphIndex) + { + AffineTransform tx, glyphTx; + GeneralPath path; + + validate(); + + if ((transforms != null) + && ((glyphTx = transforms[glyphIndex]) != null)) + { + tx = new AffineTransform(transform); + tx.concatenate(glyphTx); + } + else + tx = transform; + + path = fontDelegate.getGlyphOutline(glyphs[glyphIndex], fontSize, tx, + renderContext.isAntiAliased(), + renderContext.usesFractionalMetrics(), + FontDelegate.FLAG_FITTED); + + tx = new AffineTransform(); + tx.translate(pos[glyphIndex * 2], pos[glyphIndex * 2 + 1]); + path.transform(tx); + return path; + } + + public Shape getGlyphOutline(int glyphIndex, int type) + { + AffineTransform tx, glyphTx; + GeneralPath path; + + validate(); + + if ((transforms != null) + && ((glyphTx = transforms[glyphIndex]) != null)) + { + tx = new AffineTransform(transform); + tx.concatenate(glyphTx); + } + else + tx = transform; + + path = fontDelegate.getGlyphOutline(glyphs[glyphIndex], fontSize, tx, + renderContext.isAntiAliased(), + renderContext.usesFractionalMetrics(), + type); + + tx = new AffineTransform(); + tx.translate(pos[glyphIndex * 2], pos[glyphIndex * 2 + 1]); + path.transform(tx); + return path; + } + + /** + * Determines the position of the specified glyph, or the + * total advance width and height of the vector. + * + * @param glyphIndex the index of the glyph in question. + * If this value equals <code>getNumGlyphs()</code>, the + * position <i>after</i> the last glyph will be returned, + * which is the total advance width and height of the vector. + * + * @throws IndexOutOfBoundsException if <code>glyphIndex</code> is + * not in the range <code[0 .. getNumGlyphs()]</code>. + */ + public Point2D getGlyphPosition(int glyphIndex) + { + validate(); + return new Point2D.Float(pos[glyphIndex * 2], + pos[glyphIndex * 2 + 1]); + } + + + /** + * Moves the specified glyph to a new position, or changes the + * advance width and height of the entire glyph vector. + * + * <p>Note that the position of an individual glyph may also + * affected by its affine transformation. + * + * @param glyphIndex the index of the moved glyph. If + * <code>glyphIndex</code> equals the total number of glyphs in this + * vector, the advance width and height of the vector is changed. + * + * @param position the new position of the glyph. + * + * @throws IndexOutOfBoundsException if <code>glyphIndex</code> is + * not in the range <code[0 .. getNumGlyphs()]</code>. + */ + public void setGlyphPosition(int glyphIndex, Point2D position) + { + validate(); + pos[glyphIndex * 2] = (float) position.getX(); + pos[glyphIndex * 2 + 1] = (float) position.getY(); + } + + + /** + * Returns the affine transformation that is applied to the + * glyph at the specified index. + * + * @param glyphIndex the index of the glyph whose transformation + * is to be retrieved. + * + * @return an affine transformation, or <code>null</code> + * for the identity transformation. + * + * @throws IndexOutOfBoundsException if <code>glyphIndex</code> is + * not in the range <code[0 .. getNumGlyphs() - 1]</code>. + */ + public AffineTransform getGlyphTransform(int glyphIndex) + { + if (transforms == null) + return null; + else + return transforms[glyphIndex]; + } + + + /** + * Applies an affine transformation to the glyph at the specified + * index. + * + * @param glyphIndex the index of the glyph to which the + * transformation is applied. + * + * @param transform the affine transformation for the glyph, or + * <code>null</code> for an identity transformation. + */ + public void setGlyphTransform(int glyphIndex, + AffineTransform transform) + { + if (transforms == null) + transforms = new AffineTransform[glyphs.length]; + transforms[glyphIndex] = transform; + + /* If the GlyphVector has only a transform for a single glyph, and + * the caller clears its transform, the FLAG_HAS_TRANSFORMS bit + * should be cleared in layoutFlags. However, this would require + * that we keep track of the number of transformed glyphs, or that + * we count them when a transform is cleared. This would + * complicate the code quite a bit. Note that the only drawback of + * wrongly setting FLAG_HAS_TRANSFORMS is that a slower code path + * might be taken for rendering the vector. Right now, we never + * really look at the flag, so it does not make any difference. + */ + if (transform != null) + layoutFlags |= FLAG_HAS_TRANSFORMS; + valid = false; + } + + + /** + * Returns flags that can be used for optimizing the rendering + * of this GlyphVector. + * + * @return a bit mask with the applicable flags set. + * + * @since 1.4 + * + * @see GlyphVector#FLAG_HAS_POSITION_ADJUSTMENTS + * @see GlyphVector#FLAG_HAS_TRANSFORMS + * @see GlyphVector#FLAG_RUN_RTL + * @see GlyphVector#FLAG_COMPLEX_GLYPHS + * @see GlyphVector#FLAG_MASK + */ + public int getLayoutFlags() + { + return layoutFlags; + } + + + /** + * Returns the positions of a range of glyphs in this vector. + * + * @param firstGlyphIndex the index of the first glyph whose + * position is retrieved. + * + * @param numGlyphs the number of glyphs whose positions + * are retrieved. + * + * @param outPositions an array for storing the results + * (the length must be at least twice <code>numGlyphs</code>), + * or <code>null</code> for freshly allocating an array. + * + * @return an array with the glyph positions. The horizontal + * position of the <code>i</code>-th glyph is at index <code>2 * + * i</code>, the vertical position at index <code>2 * i + 1</code>. + * + * @throws IllegalArgumentException if <code>numGlyphs</code> + * is less than zero. + * + * @throws IndexOutOfBoundsException if either + * <code>firstGlyphIndex</code> or <code>(firstGlyphIndex + + * numGlyphs)</code> is not in the range <code>[0 .. getNumGlyphs() - + * 1]</code>. + */ + public float[] getGlyphPositions(int firstGlyphIndex, + int numGlyphs, + float[] outPositions) + { + if (numGlyphs < 0) + throw new IllegalArgumentException(); + + validate(); + if (outPositions == null) + outPositions = new float[numGlyphs * 2]; + + System.arraycopy(/*src */ pos, /* srcStart */ firstGlyphIndex * 2, + /* dest */ outPositions, /* destStart */ 0, + /* length */ numGlyphs * 2); + return outPositions; + } + + + private float getAscent() + { + return fontDelegate.getAscent(fontSize, transform, + renderContext.isAntiAliased(), + renderContext.usesFractionalMetrics(), + /* horizontal */ true); + } + + + private float getDescent() + { + return fontDelegate.getDescent(fontSize, transform, + renderContext.isAntiAliased(), + renderContext.usesFractionalMetrics(), + /* horizontal */ true); + } + + + public Shape getGlyphLogicalBounds(int glyphIndex) + { + float x, y, ascent; + + validate(); + ascent = getAscent(); + x = pos[glyphIndex * 2]; + y = pos[glyphIndex * 2 + 1]; + + return new Rectangle2D.Float(x, y - ascent, + pos[(glyphIndex + 1) * 2] - x, + ascent - getDescent()); + } + + + public Shape getGlyphVisualBounds(int glyphIndex) + { + return getGlyphOutline(glyphIndex).getBounds2D(); + } + + + /** + * Determines the metrics of the glyph at the specified index. + * + * @param glyphIndex the index of the glyph whose metrics is to be + * retrieved. + * + * @throws IndexOutOfBoundsException if <code>glyphIndex</code> is + * not in the range <code[0 .. getNumGlyphs() - 1]</code>. + */ + public GlyphMetrics getGlyphMetrics(int glyphIndex) + { + // FIXME: Not yet implemented. + throw new UnsupportedOperationException(); + } + + + /** + * Determines the justification information for the glyph at the + * specified index. + * + * @param glyphIndex the index of the glyph whose justification + * information is to be retrieved. + * + * @throws IndexOutOfBoundsException if <code>glyphIndex</code> is + * not in the range <code[0 .. getNumGlyphs() - 1]</code>. + */ + public GlyphJustificationInfo getGlyphJustificationInfo(int glyphIndex) + { + // FIXME: Not yet implemented. + throw new UnsupportedOperationException(); + } + + + /** + * Determines whether another GlyphVector is for the same font and + * rendering context, uses the same glyphs and positions them to the + * same location. + * + * @param other the GlyphVector to compare with. + * + * @return <code>true</code> if the two vectors are equal, + * <code>false</code> otherwise. + */ + public boolean equals(GlyphVector other) + { + GNUGlyphVector o; + if (!(other instanceof GNUGlyphVector)) + return false; + + o = (GNUGlyphVector) other; + if ((this.font != o.font) + || (this.fontDelegate != o.fontDelegate) + || (this.renderContext != o.renderContext) + || (this.glyphs.length != o.glyphs.length)) + return false; + + for (int i = 0; i < glyphs.length; i++) + if (this.glyphs[i] != o.glyphs[i]) + return false; + + validate(); + o.validate(); + for (int i = 0; i < pos.length; i++) + if (this.pos[i] != o.pos[i]) + return false; + + return true; + } + + private void validate() + { + if (!valid) + performDefaultLayout(); + } +} |