diff options
author | Andy Nichols <andy.nichols@qt.io> | 2016-04-03 18:06:46 +0200 |
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committer | Andy Nichols <andy.nichols@qt.io> | 2016-12-13 15:43:15 +0000 |
commit | 3f57f2b7cc3899af154257a3c858bd23d9f03a62 (patch) | |
tree | 45ba7f7a37110c81963bf644b8830201504e117f /src/plugins/scenegraph/openvg/qsgopenvgfontglyphcache.cpp | |
parent | bff7302fc277d18b5bd4ad95d35b9e1bbc2be001 (diff) |
OpenVG Scenegraph Adaptation
This is an OpenVG backend for the Qt Quick 2 scenegraph.
Should be feature complete now, but there are still some issues that
could be improved in future commits:
If Rectangle nodes are rendered with a non-affine transform, they will
be rendered incorrectly. This is because paths expect affine
transformations.
The Glyph cache is a bit cheeky in that it's caching paths, but doing
so per font size. It shoudln't need to, but right now I've not though
up a good way of getting the transform/scale needed when rendering yet.
Change-Id: Ie3c4f2df35d14279b0f9f55e0e10a873328c025b
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
Diffstat (limited to 'src/plugins/scenegraph/openvg/qsgopenvgfontglyphcache.cpp')
-rw-r--r-- | src/plugins/scenegraph/openvg/qsgopenvgfontglyphcache.cpp | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/src/plugins/scenegraph/openvg/qsgopenvgfontglyphcache.cpp b/src/plugins/scenegraph/openvg/qsgopenvgfontglyphcache.cpp new file mode 100644 index 0000000000..1ed54f7b6a --- /dev/null +++ b/src/plugins/scenegraph/openvg/qsgopenvgfontglyphcache.cpp @@ -0,0 +1,185 @@ +/**************************************************************************** +** +** Copyright (C) 2016 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the QtQuick module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see https://www.qt.io/terms-conditions. For further +** information use the contact form at https://www.qt.io/contact-us. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 3 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL3 included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 3 requirements +** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 2.0 or (at your option) the GNU General +** Public license version 3 or any later version approved by the KDE Free +** Qt Foundation. The licenses are as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 +** included in the packaging of this file. Please review the following +** information to ensure the GNU General Public License requirements will +** be met: https://www.gnu.org/licenses/gpl-2.0.html and +** https://www.gnu.org/licenses/gpl-3.0.html. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qsgopenvgfontglyphcache.h" +#include "qsgopenvghelpers.h" +#include <private/qfontengine_p.h> +#include <private/qrawfont_p.h> + +QT_BEGIN_NAMESPACE + +QSGOpenVGFontGlyphCacheManager::QSGOpenVGFontGlyphCacheManager() +{ + +} + +QSGOpenVGFontGlyphCacheManager::~QSGOpenVGFontGlyphCacheManager() +{ + qDeleteAll(m_caches); +} + +QSGOpenVGFontGlyphCache *QSGOpenVGFontGlyphCacheManager::cache(const QRawFont &font) +{ + return m_caches.value(fontKey(font), nullptr); +} + +void QSGOpenVGFontGlyphCacheManager::insertCache(const QRawFont &font, QSGOpenVGFontGlyphCache *cache) +{ + m_caches.insert(fontKey(font), cache); +} + +QString QSGOpenVGFontGlyphCacheManager::fontKey(const QRawFont &font) +{ + QFontEngine *fe = QRawFontPrivate::get(font)->fontEngine; + if (!fe->faceId().filename.isEmpty()) { + QByteArray keyName = fe->faceId().filename; + if (font.style() != QFont::StyleNormal) + keyName += QByteArray(" I"); + if (font.weight() != QFont::Normal) + keyName += ' ' + QByteArray::number(font.weight()); + keyName += " " + QString::number(font.pixelSize()); + keyName += QByteArray(" DF"); + return QString::fromUtf8(keyName); + } else { + return QString::fromLatin1("%1_%2_%3_%4_%5") + .arg(font.familyName()) + .arg(font.styleName()) + .arg(font.weight()) + .arg(font.style()) + .arg(font.pixelSize()); + } +} + + +QSGOpenVGFontGlyphCache::QSGOpenVGFontGlyphCache(QSGOpenVGFontGlyphCacheManager *manager, const QRawFont &font) + : m_manager(manager) +{ + m_referenceFont = font; + QRawFontPrivate *fontD = QRawFontPrivate::get(font); + m_glyphCount = fontD->fontEngine->glyphCount(); + m_font = vgCreateFont(0); +} + +QSGOpenVGFontGlyphCache::~QSGOpenVGFontGlyphCache() +{ + if (m_font != VG_INVALID_HANDLE) + vgDestroyFont(m_font); +} + +void QSGOpenVGFontGlyphCache::populate(const QVector<quint32> &glyphs) +{ + QSet<quint32> referencedGlyphs; + QSet<quint32> newGlyphs; + int count = glyphs.count(); + for (int i = 0; i < count; ++i) { + quint32 glyphIndex = glyphs.at(i); + if ((int) glyphIndex >= glyphCount()) { + qWarning("Warning: glyph is not available with index %d", glyphIndex); + continue; + } + + referencedGlyphs.insert(glyphIndex); + + + if (!m_cachedGlyphs.contains(glyphIndex)) { + newGlyphs.insert(glyphIndex); + } + } + + referenceGlyphs(referencedGlyphs); + if (!newGlyphs.isEmpty()) + requestGlyphs(newGlyphs); +} + +void QSGOpenVGFontGlyphCache::release(const QVector<quint32> &glyphs) +{ + QSet<quint32> unusedGlyphs; + int count = glyphs.count(); + for (int i = 0; i < count; ++i) { + quint32 glyphIndex = glyphs.at(i); + unusedGlyphs.insert(glyphIndex); + } + releaseGlyphs(unusedGlyphs); +} + +void QSGOpenVGFontGlyphCache::requestGlyphs(const QSet<quint32> &glyphs) +{ + VGfloat origin[2]; + VGfloat escapement[2]; + QRectF metrics; + QRawFont rawFont = m_referenceFont; + + // Before adding any new glyphs, remove any unused glyphs + for (auto glyph : qAsConst(m_unusedGlyphs)) { + vgClearGlyph(m_font, glyph); + } + + for (auto glyph : glyphs) { + m_cachedGlyphs.insert(glyph); + + // Calculate the path for the glyph and cache it. + QPainterPath path = rawFont.pathForGlyph(glyph); + VGPath vgPath; + if (!path.isEmpty()) { + vgPath = QSGOpenVGHelpers::qPainterPathToVGPath(path); + } else { + // Probably a "space" character with no visible outline. + vgPath = VG_INVALID_HANDLE; + } + origin[0] = 0; + origin[1] = 0; + escapement[0] = 0; + escapement[1] = 0; + vgSetGlyphToPath(m_font, glyph, vgPath, VG_FALSE, origin, escapement); + vgDestroyPath(vgPath); // Reduce reference count. + } + +} + +void QSGOpenVGFontGlyphCache::referenceGlyphs(const QSet<quint32> &glyphs) +{ + m_unusedGlyphs -= glyphs; +} + +void QSGOpenVGFontGlyphCache::releaseGlyphs(const QSet<quint32> &glyphs) +{ + m_unusedGlyphs += glyphs; +} + +QT_END_NAMESPACE |