QImage QWindowsFontEngineDirectWrite::alphaRGBMapForGlyph(glyph_t t, QFixed subPixelPosition, const QTransform &xform) { QImage mask = imageForGlyph(t, subPixelPosition, glyphMargin(QFontEngineGlyphCache::Raster_RGBMask), xform); return mask.depth() == 32 ? mask : mask.convertToFormat(QImage::Format_RGB32); }
bool QTextureGlyphCache::populate(QFontEngine *fontEngine, int numGlyphs, const glyph_t *glyphs, const QFixedPoint *positions) { #ifdef CACHE_DEBUG printf("Populating with %d glyphs\n", numGlyphs); qDebug() << " -> current transformation: " << m_transform; #endif m_current_fontengine = fontEngine; const int margin = glyphMargin(); const int paddingDoubled = glyphPadding() * 2; bool supportsSubPixelPositions = fontEngine->supportsSubPixelPositions(); if (fontEngine->m_subPixelPositionCount == 0) { if (!supportsSubPixelPositions) { fontEngine->m_subPixelPositionCount = 1; } else { int i = 0; while (fontEngine->m_subPixelPositionCount == 0 && i < numGlyphs) fontEngine->m_subPixelPositionCount = calculateSubPixelPositionCount(glyphs[i++]); } } QHash<GlyphAndSubPixelPosition, Coord> listItemCoordinates; int rowHeight = 0; QFontEngine::GlyphFormat format; switch (m_type) { case Raster_A8: format = QFontEngine::Format_A8; break; case Raster_RGBMask: format = QFontEngine::Format_A32; break; default: format = QFontEngine::Format_Mono; break; } // check each glyph for its metrics and get the required rowHeight. for (int i=0; i < numGlyphs; ++i) { const glyph_t glyph = glyphs[i]; QFixed subPixelPosition; if (supportsSubPixelPositions) { QFixed x = positions != 0 ? positions[i].x : QFixed(); subPixelPosition = fontEngine->subPixelPositionForX(x); } if (coords.contains(GlyphAndSubPixelPosition(glyph, subPixelPosition))) continue; if (listItemCoordinates.contains(GlyphAndSubPixelPosition(glyph, subPixelPosition))) continue; glyph_metrics_t metrics = fontEngine->alphaMapBoundingBox(glyph, subPixelPosition, m_transform, format); #ifdef CACHE_DEBUG printf("(%4x): w=%.2f, h=%.2f, xoff=%.2f, yoff=%.2f, x=%.2f, y=%.2f\n", glyph, metrics.width.toReal(), metrics.height.toReal(), metrics.xoff.toReal(), metrics.yoff.toReal(), metrics.x.toReal(), metrics.y.toReal()); #endif GlyphAndSubPixelPosition key(glyph, subPixelPosition); int glyph_width = metrics.width.ceil().toInt(); int glyph_height = metrics.height.ceil().toInt(); if (glyph_height == 0 || glyph_width == 0) { // Avoid multiple calls to boundingBox() for non-printable characters Coord c = { 0, 0, 0, 0, 0, 0 }; coords.insert(key, c); continue; } glyph_width += margin * 2 + 4; glyph_height += margin * 2 + 4; // align to 8-bit boundary if (m_type == QFontEngineGlyphCache::Raster_Mono) glyph_width = (glyph_width+7)&~7; Coord c = { 0, 0, // will be filled in later glyph_width, glyph_height, // texture coords metrics.x.truncate(), -metrics.y.truncate() }; // baseline for horizontal scripts listItemCoordinates.insert(key, c); rowHeight = qMax(rowHeight, glyph_height); } if (listItemCoordinates.isEmpty()) return true; rowHeight += margin * 2 + paddingDoubled; if (m_w == 0) { if (fontEngine->maxCharWidth() <= QT_DEFAULT_TEXTURE_GLYPH_CACHE_WIDTH) m_w = QT_DEFAULT_TEXTURE_GLYPH_CACHE_WIDTH; else m_w = qt_next_power_of_two(fontEngine->maxCharWidth()); } // now actually use the coords and paint the wanted glyps into cache. QHash<GlyphAndSubPixelPosition, Coord>::iterator iter = listItemCoordinates.begin(); int requiredWidth = m_w; while (iter != listItemCoordinates.end()) { Coord c = iter.value(); m_currentRowHeight = qMax(m_currentRowHeight, c.h + margin * 2); if (m_cx + c.w > requiredWidth) { int new_width = requiredWidth*2; while (new_width < m_cx + c.w) new_width *= 2; if (new_width <= maxTextureWidth()) { requiredWidth = new_width; } else { // no room on the current line, start new glyph strip m_cx = 0; m_cy += m_currentRowHeight + paddingDoubled; m_currentRowHeight = c.h + margin * 2; // New row } } if (maxTextureHeight() > 0 && m_cy + c.h > maxTextureHeight()) { // We can't make a cache of the required size, so we bail out return false; } c.x = m_cx; c.y = m_cy; coords.insert(iter.key(), c); m_pendingGlyphs.insert(iter.key(), c); m_cx += c.w + paddingDoubled; ++iter; } return true; }