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Diffstat (limited to 'src/gui/painting/qtextureglyphcache.cpp')
| -rw-r--r-- | src/gui/painting/qtextureglyphcache.cpp | 316 |
1 files changed, 316 insertions, 0 deletions
diff --git a/src/gui/painting/qtextureglyphcache.cpp b/src/gui/painting/qtextureglyphcache.cpp new file mode 100644 index 0000000000..1ea40bad89 --- /dev/null +++ b/src/gui/painting/qtextureglyphcache.cpp @@ -0,0 +1,316 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Qt Software Information (qt-info@nokia.com) +** +** This file is part of the QtGui module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the either Technology Preview License Agreement or the +** Beta Release License Agreement. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain +** additional rights. These rights are described in the Nokia Qt LGPL +** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this +** package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 3.0 as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU General Public License version 3.0 requirements will be +** met: http://www.gnu.org/copyleft/gpl.html. +** +** If you are unsure which license is appropriate for your use, please +** contact the sales department at qt-sales@nokia.com. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include <qmath.h> + +#include "qtextureglyphcache_p.h" + +#include "private/qnumeric_p.h" +#include "private/qnativeimage_p.h" +#include "private/qfontengine_ft_p.h" + +QT_BEGIN_NAMESPACE + +// #define CACHE_DEBUG + +void QTextureGlyphCache::populate(const QTextItemInt &ti, + const QVarLengthArray<glyph_t> &glyphs, + const QVarLengthArray<QFixedPoint> &) +{ +#ifdef CACHE_DEBUG + printf("Populating with '%s'\n", QString::fromRawData(ti.chars, ti.num_chars).toLatin1().data()); + qDebug() << " -> current transformation: " << m_transform; +#endif + + m_current_textitem = &ti; + const int margin = glyphMargin(); + + QHash<glyph_t, Coord> listItemCoordinates; + int rowHeight = 0; + + // check each glyph for its metrics and get the required rowHeight. + for (int i=0; i < glyphs.size(); ++i) { + const glyph_t glyph = glyphs[i]; + if (coords.contains(glyph)) + continue; + if (listItemCoordinates.contains(glyph)) + continue; + glyph_metrics_t metrics = ti.fontEngine->boundingBox(glyph, m_transform); + +#ifdef CACHE_DEBUG + printf("'%c' (%4x): w=%.2f, h=%.2f, xoff=%.2f, yoff=%.2f, x=%.2f, y=%.2f, ti.ascent=%.2f, ti.descent=%.2f\n", + ti.chars[i].toLatin1(), + glyph, + metrics.width.toReal(), + metrics.height.toReal(), + metrics.xoff.toReal(), + metrics.yoff.toReal(), + metrics.x.toReal(), + metrics.y.toReal(), + ti.ascent.toReal(), + ti.descent.toReal()); +#endif + int glyph_width = metrics.width.ceil().toInt() + margin * 2; + int glyph_height = metrics.height.ceil().toInt() + margin * 2; + if (glyph_height == 0 || glyph_width == 0) + continue; + + // 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(glyph, c); + rowHeight = qMax(rowHeight, glyph_height); + } + if (listItemCoordinates.isEmpty()) + return; + + rowHeight += margin * 2; + if (isNull()) + createCache(256, rowHeight); + + // now actually use the coords and paint the wanted glyps into cache. + QHash<glyph_t, Coord>::iterator iter = listItemCoordinates.begin(); + while (iter != listItemCoordinates.end()) { + Coord c = iter.value(); + + if (m_cx + c.w > m_w) { + // no room on the current line, start new glyph strip + m_cx = 0; + m_cy = m_h; + } + if (m_cy + c.h > m_h) { + int new_height; + if (m_cx == 0) { // add a whole row + new_height = m_h + rowHeight; + m_cy = m_h; + } else { // just extend row + new_height = m_cy + rowHeight; + } + // if no room in the current texture - realloc a larger texture + resizeTextureData(m_w, new_height); + m_h = new_height; + } + + c.x = m_cx; + c.y = m_cy; + + fillTexture(c, iter.key()); + coords.insert(iter.key(), c); + + if (m_cx + c.w > m_w) { + m_cx = 0; + m_cy += rowHeight; + } else { + // for the Mono case, glyph_width is 8-bit aligned, + // and therefore so will m_cx + m_cx += c.w; + } + ++iter; + } + + +} + +/************************************************************************ + * QImageTextureGlyphCache + */ + +void QImageTextureGlyphCache::resizeTextureData(int width, int height) +{ + m_image = m_image.copy(0, 0, width, height); +} + +void QImageTextureGlyphCache::createTextureData(int width, int height) +{ + switch (m_type) { + case QFontEngineGlyphCache::Raster_Mono: + m_image = QImage(width, height, QImage::Format_Mono); + break; + case QFontEngineGlyphCache::Raster_A8: { + m_image = QImage(width, height, QImage::Format_Indexed8); + m_image.fill(0); + QVector<QRgb> colors(256); + QRgb *it = colors.data(); + for (int i=0; i<256; ++i, ++it) + *it = 0xff000000 | i | (i<<8) | (i<<16); + m_image.setColorTable(colors); + break; } + case QFontEngineGlyphCache::Raster_RGBMask: + m_image = QImage(width, height, QImage::Format_RGB32); + break; + } +} + +int QImageTextureGlyphCache::glyphMargin() const +{ +#ifdef Q_WS_MAC + return 2; +#else + return m_type == QFontEngineGlyphCache::Raster_RGBMask ? 2 : 0; +#endif +} + +void QImageTextureGlyphCache::fillTexture(const Coord &c, glyph_t g) +{ + QImage mask; +#if defined(Q_WS_X11) + if (m_transform.type() > QTransform::TxTranslate) { + QFontEngineFT::GlyphFormat format = QFontEngineFT::Format_None; + switch (m_type) { + case Raster_RGBMask: + format = QFontEngineFT::Format_A32; break; + case Raster_A8: + format = QFontEngineFT::Format_A8; break; + case Raster_Mono: + format = QFontEngineFT::Format_Mono; break; + }; + + QFontEngineFT *ft = static_cast<QFontEngineFT*> (m_current_textitem->fontEngine); + QFontEngineFT::QGlyphSet *gset = ft->loadTransformedGlyphSet(m_transform); + + if (gset && ft->loadGlyphs(gset, &g, 1, format)) { + QFontEngineFT::Glyph *glyph = gset->glyph_data.value(g); + const int bytesPerLine = (format == QFontEngineFT::Format_Mono ? ((glyph->width + 31) & ~31) >> 3 + : (glyph->width + 3) & ~3); + mask = QImage(glyph->data, glyph->width, glyph->height, bytesPerLine, m_image.format()); + } + } else +#endif + if (m_type == QFontEngineGlyphCache::Raster_RGBMask) + mask = m_current_textitem->fontEngine->alphaRGBMapForGlyph(g, glyphMargin(), m_transform); + else + mask = m_current_textitem->fontEngine->alphaMapForGlyph(g, m_transform); + +#ifdef CACHE_DEBUG + printf("fillTexture of %dx%d at %d,%d in the cache of %dx%d\n", c.w, c.h, c.x, c.y, m_image.width(), m_image.height()); + if (mask.width() > c.w || mask.height() > c.h) { + printf(" ERROR; mask is bigger than reserved space! %dx%d instead of %dx%d\n", mask.width(), mask.height(), c.w,c.h); + return; + } +#endif + + if (m_type == QFontEngineGlyphCache::Raster_RGBMask) { + QPainter p(&m_image); + p.setCompositionMode(QPainter::CompositionMode_Source); + p.fillRect(c.x, c.y, c.w, c.h, QColor(0,0,0,0)); // TODO optimize this + p.drawImage(c.x, c.y, mask); + p.end(); + } else if (m_type == QFontEngineGlyphCache::Raster_Mono) { + if (mask.depth() > 1) { + // TODO optimize this + mask = mask.alphaChannel(); + mask.invertPixels(); + mask = mask.convertToFormat(QImage::Format_Mono); + } + + int mw = qMin(mask.width(), c.w); + int mh = qMin(mask.height(), c.h); + uchar *d = m_image.bits(); + int dbpl = m_image.bytesPerLine(); + + for (int y = 0; y < c.h; ++y) { + uchar *dest = d + (c.y + y) *dbpl + c.x/8; + + if (y < mh) { + uchar *src = mask.scanLine(y); + for (int x = 0; x < c.w/8; ++x) { + if (x < (mw+7)/8) + dest[x] = src[x]; + else + dest[x] = 0; + } + } else { + for (int x = 0; x < c.w/8; ++x) + dest[x] = 0; + } + } + } else { // A8 + int mw = qMin(mask.width(), c.w); + int mh = qMin(mask.height(), c.h); + uchar *d = m_image.bits(); + int dbpl = m_image.bytesPerLine(); + + if (mask.depth() == 1) { + for (int y = 0; y < c.h; ++y) { + uchar *dest = d + (c.y + y) *dbpl + c.x; + if (y < mh) { + uchar *src = (uchar *) mask.scanLine(y); + for (int x = 0; x < c.w; ++x) { + if (x < mw) + dest[x] = (src[x >> 3] & (1 << (7 - (x & 7)))) > 0 ? 255 : 0; + } + } + } + } else if (mask.depth() == 8) { + for (int y = 0; y < c.h; ++y) { + uchar *dest = d + (c.y + y) *dbpl + c.x; + if (y < mh) { + uchar *src = (uchar *) mask.scanLine(y); + for (int x = 0; x < c.w; ++x) { + if (x < mw) + dest[x] = src[x]; + } + } + } + } + } + +#ifdef CACHE_DEBUG +// QPainter p(&m_image); +// p.drawLine( + QPoint base(c.x + glyphMargin(), c.y + glyphMargin() + c.baseLineY-1); + if (m_image.rect().contains(base)) + m_image.setPixel(base, 255); + m_image.save(QString::fromLatin1("cache-%1-%2-%3.png") + .arg(m_current_textitem->font().family()) + .arg(m_current_textitem->font().pointSize()) + .arg(m_transform.type())); +#endif +} + +QT_END_NAMESPACE |