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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtQuick module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:COMM$
**
** 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.
**
** $QT_END_LICENSE$
**
**
**
**
**
**
**
**
**
**
**
**
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**
**
****************************************************************************/
#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_glyphReferences.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];
QRawFont rawFont = m_referenceFont;
for (auto glyph : glyphs) {
// 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)
{
for (auto glyph : glyphs) {
if (m_glyphReferences.contains(glyph))
m_glyphReferences[glyph] += 1;
else
m_glyphReferences.insert(glyph, 1);
}
}
void QSGOpenVGFontGlyphCache::releaseGlyphs(const QSet<quint32> &glyphs)
{
for (auto glyph : glyphs) {
int references = m_glyphReferences[glyph] -= 1;
if (references == 0) {
vgClearGlyph(m_font, glyph);
m_glyphReferences.remove(glyph);
}
}
}
QT_END_NAMESPACE
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