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/*
* Copyright (c) 2010, 2013, 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 sun.awt.*;
import sun.java2d.InvalidPipeException;
import sun.java2d.SunGraphics2D;
import sun.java2d.pipe.GlyphListPipe;
import sun.java2d.xr.*;
/**
* A delegate pipe of SG2D for drawing any text to a XRender surface
*
* @author Clemens Eisserer
*/
public class XRTextRenderer extends GlyphListPipe {
// Workarround for a bug in libXrender.
// In case the number of glyphs of an ELT is a multiple of 254,
// a few garbage bytes are sent to the XServer causing hangs.
static final int MAX_ELT_GLYPH_COUNT = 253;
XRGlyphCache glyphCache;
XRCompositeManager maskBuffer;
XRBackend backend;
GrowableEltArray eltList;
public XRTextRenderer(XRCompositeManager buffer) {
glyphCache = new XRGlyphCache(buffer);
maskBuffer = buffer;
backend = buffer.getBackend();
eltList = new GrowableEltArray(64);
}
protected void drawGlyphList(SunGraphics2D sg2d, GlyphList gl) {
if (gl.getNumGlyphs() == 0) {
return;
}
try {
SunToolkit.awtLock();
XRSurfaceData x11sd;
try {
x11sd = (XRSurfaceData) sg2d.surfaceData;
} catch (ClassCastException e) {
throw new InvalidPipeException("wrong surface data type: " + sg2d.surfaceData);
}
x11sd.validateAsDestination(null, sg2d.getCompClip());
x11sd.maskBuffer.validateCompositeState(sg2d.composite, sg2d.transform, sg2d.paint, sg2d);
float advX = gl.getX();
float advY = gl.getY();
int oldPosX = 0, oldPosY = 0;
if (gl.isSubPixPos()) {
advX += 0.1666667f;
advY += 0.1666667f;
} else {
advX += 0.5f;
advY += 0.5f;
}
XRGlyphCacheEntry[] cachedGlyphs = glyphCache.cacheGlyphs(gl);
boolean containsLCDGlyphs = false;
int activeGlyphSet = cachedGlyphs[0].getGlyphSet();
int eltIndex = -1;
gl.startGlyphIteration();
float[] positions = gl.getPositions();
for (int i = 0; i < gl.getNumGlyphs(); i++) {
gl.setGlyphIndex(i);
XRGlyphCacheEntry cacheEntry = cachedGlyphs[i];
eltList.getGlyphs().addInt(cacheEntry.getGlyphID());
int glyphSet = cacheEntry.getGlyphSet();
containsLCDGlyphs |= (glyphSet == glyphCache.lcdGlyphSet);
int posX = 0, posY = 0;
if (gl.usePositions()
|| cacheEntry.getXAdvance() != ((float) cacheEntry.getXOff())
|| cacheEntry.getYAdvance() != ((float) cacheEntry.getYOff())
|| glyphSet != activeGlyphSet
|| eltIndex < 0
|| eltList.getCharCnt(eltIndex) == MAX_ELT_GLYPH_COUNT) {
eltIndex = eltList.getNextIndex();
eltList.setCharCnt(eltIndex, 1);
activeGlyphSet = glyphSet;
eltList.setGlyphSet(eltIndex, glyphSet);
if (gl.usePositions()) {
// In this case advX only stores rounding errors
float x = positions[i * 2] + advX;
float y = positions[i * 2 + 1] + advY;
posX = (int) Math.floor(x);
posY = (int) Math.floor(y);
advX -= cacheEntry.getXOff();
advY -= cacheEntry.getYOff();
} else {
/*
* Calculate next glyph's position in the case of
* relative positioning. In XRender we can only position
* glyphs using integer coordinates, therefor we sum all
* the advances up as float, and convert them to integer
* later. This way rounding-error can be corrected, and
* is required to be consistent with the software loops.
*/
posX = (int) Math.floor(advX);
posY = (int) Math.floor(advY);
// Advance of ELT = difference between stored relative
// positioning information and required float.
advX += (cacheEntry.getXAdvance() - cacheEntry.getXOff());
advY += (cacheEntry.getYAdvance() - cacheEntry.getYOff());
}
// Offset of the current glyph is the difference
// to the last glyph and this one
eltList.setXOff(eltIndex, (posX - oldPosX));
eltList.setYOff(eltIndex, (posY - oldPosY));
oldPosX = posX;
oldPosY = posY;
} else {
eltList.setCharCnt(eltIndex, eltList.getCharCnt(eltIndex) + 1);
}
}
int maskFormat = containsLCDGlyphs ? XRUtils.PictStandardARGB32 : XRUtils.PictStandardA8;
maskBuffer.compositeText(x11sd, (int) gl.getX(), (int) gl.getY(), 0, maskFormat, eltList);
eltList.clear();
} finally {
SunToolkit.awtUnlock();
}
}
}
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