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package sun.font;

import sun.awt.*;
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
/** * 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 = (XRSurfaceData) 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.getBounds(); 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(); } } }