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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/opentype/Scaler.java | |
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Diffstat (limited to 'libjava/classpath/gnu/java/awt/font/opentype/Scaler.java')
-rw-r--r-- | libjava/classpath/gnu/java/awt/font/opentype/Scaler.java | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/awt/font/opentype/Scaler.java b/libjava/classpath/gnu/java/awt/font/opentype/Scaler.java new file mode 100644 index 000000000..c7582b666 --- /dev/null +++ b/libjava/classpath/gnu/java/awt/font/opentype/Scaler.java @@ -0,0 +1,205 @@ +/* Scaler.java -- Common superclass for font scalers. + 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.opentype; + +import gnu.java.awt.font.opentype.truetype.Zone; + +import java.awt.geom.AffineTransform; +import java.awt.geom.GeneralPath; +import java.awt.geom.Point2D; + + +/** + * An common superclass for all font scalers. The main task of font + * scaler is to retrieve a scaled and hinted outline for a glyph. + * + * <p>To make text more legible, high-quality fonts contain + * instructions (sometimes also called “hints”) for + * moving the scaled control points towards the coordinate grid of the + * display device. + * + * <p><b>Lack of Thread Safety:</b> Font scalers are intentionally + * <i>not</i> safe to access from multiple concurrent + * threads. Synchronization needs to be performed externally. Usually, + * the font that uses this scaler already has obtained a lock before + * calling the scaler. + * + * @author Sascha Brawer (brawer@dandelis.ch) + */ +public abstract class Scaler +{ + /** + * Retrieves the scaled outline of a glyph, adjusting control points + * to the raster grid if necessary. + * + * @param glyph the glyph number whose outline is retrieved. + * + * @param pointSize the point size of the font. + * + * @param transform a transform that is applied in addition to + * scaling to the specified point size. This is often used for + * scaling according to the device resolution. Those who lack any + * aesthetic sense may also use the transform to slant or stretch + * glyphs. + * + * @param antialias whether or not the rasterizer will perform + * anti-aliasing on the returned path. + * + * @param fractionalMetrics <code>false</code> for adjusting glyph + * positions to the raster grid of device space. + * + * @return the scaled and grid-fitted outline of the specified + * glyph, or <code>null</code> for bitmap fonts. + */ + public abstract GeneralPath getOutline(int glyph, + float pointSize, + AffineTransform transform, + boolean antialias, + boolean fractionalMetrics, + Hinter hinter, int type); + + + /** + * Determines the advance width and height for a glyph. + * + * @param glyphIndex the glyph whose advance width is to be + * determined. + * + * @param pointSize the point size of the font. + * + * @param transform a transform that is applied in addition to + * scaling to the specified point size. This is often used for + * scaling according to the device resolution. Those who lack any + * aesthetic sense may also use the transform to slant or stretch + * glyphs. + * + * @param antialias <code>true</code> for anti-aliased rendering, + * <code>false</code> for normal rendering. For hinted fonts, + * this parameter may indeed affect the result. + * + * @param fractionalMetrics <code>true</code> for fractional metrics, + * <code>false</code> for rounding the result to a pixel boundary. + * + * @param horizontal <code>true</code> for horizontal line layout, + * <code>false</code> for vertical line layout. + * + * @param advance a point whose <code>x</code> and <code>y</code> + * fields will hold the advance in each direction. It is well + * possible that both values are non-zero, for example for rotated + * text or for Urdu fonts. + */ + public abstract void getAdvance(int glyphIndex, + float pointSize, + AffineTransform transform, + boolean antialias, + boolean fractionalMetrics, + boolean horizontal, + Point2D advance); + + + /** + * Determines the distance between the base line and the highest + * ascender. + * + * @param pointSize the point size of the font. + * + * @param transform a transform that is applied in addition to + * scaling to the specified point size. This is often used for + * scaling according to the device resolution. Those who lack any + * aesthetic sense may also use the transform to slant or stretch + * glyphs. + * + * @param antialias <code>true</code> for anti-aliased rendering, + * <code>false</code> for normal rendering. For hinted fonts, + * this parameter may indeed affect the result. + * + * @param fractionalMetrics <code>true</code> for fractional metrics, + * <code>false</code> for rounding the result to a pixel boundary. + * + * @param horizontal <code>true</code> for horizontal line layout, + * <code>false</code> for vertical line layout. + * + * @return the ascent, which usually is a positive number. + */ + public abstract float getAscent(float pointSize, + AffineTransform transform, + boolean antialias, + boolean fractionalMetrics, + boolean horizontal); + + + /** + * Determines the distance between the base line and the lowest + * descender. + * + * @param pointSize the point size of the font. + * + * @param transform a transform that is applied in addition to + * scaling to the specified point size. This is often used for + * scaling according to the device resolution. Those who lack any + * aesthetic sense may also use the transform to slant or stretch + * glyphs. + * + * @param antialiased <code>true</code> for anti-aliased rendering, + * <code>false</code> for normal rendering. For hinted fonts, + * this parameter may indeed affect the result. + * + * @param fractionalMetrics <code>true</code> for fractional metrics, + * <code>false</code> for rounding the result to a pixel boundary. + * + * @param horizontal <code>true</code> for horizontal line layout, + * <code>false</code> for vertical line layout. + * + * @return the descent, which usually is a nagative number. + */ + public abstract float getDescent(float pointSize, + AffineTransform transform, + boolean antialiased, + boolean fractionalMetrics, + boolean horizontal); + + /** + * Returns the raw outline data. This is used for the autofitter atm. + * + * @param glyph the glyph index + * @param transform the transform to apply + * + * @return the raw glyph outline + */ + public abstract Zone getRawOutline(int glyph, AffineTransform transform); +} |