1 files changed, 162 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..dd630c776f
--- /dev/null
+++ b/src/plugins/scenegraph/openvg/qsgopenvgfontglyphcache.cpp
@@ -0,0 +1,162 @@
+/****************************************************************************
+**
+** 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(font, nullptr);
+}
+
+void QSGOpenVGFontGlyphCacheManager::insertCache(const QRawFont &font, QSGOpenVGFontGlyphCache *cache)
+{
+    m_caches.insert(font, cache);
+}
+
+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