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/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtDeclarative module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** 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 1.1, 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.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef DISTANCEFIELDGLYPHCACHE_H
#define DISTANCEFIELDGLYPHCACHE_H
#include <qgl.h>
#include <qrawfont.h>
#include <private/qgl_p.h>
#include <private/qfont_p.h>
#include <private/qfontengine_p.h>
#include <QtGui/private/qdatabuffer_p.h>
QT_BEGIN_NAMESPACE
class QGLShaderProgram;
class Q_DECLARATIVE_EXPORT QSGDistanceFieldGlyphCache : public QObject
{
Q_OBJECT
public:
~QSGDistanceFieldGlyphCache();
static QSGDistanceFieldGlyphCache *get(const QGLContext *ctx, const QRawFont &font);
struct Metrics {
qreal width;
qreal height;
qreal baselineX;
qreal baselineY;
bool isNull() const { return width == 0 || height == 0; }
};
Metrics glyphMetrics(glyph_t glyph);
struct TexCoord {
qreal x;
qreal y;
qreal width;
qreal height;
qreal xMargin;
qreal yMargin;
TexCoord() : x(0), y(0), width(0), height(0), xMargin(0), yMargin(0) { }
bool isNull() const { return width == 0 || height == 0; }
};
TexCoord glyphTexCoord(glyph_t glyph);
GLuint texture();
QSize textureSize() const;
int maxTextureSize() const;
qreal fontScale() const;
int distanceFieldRadius() const;
QImage renderDistanceFieldGlyph(glyph_t glyph) const;
int glyphCount() const;
void populate(int count, const glyph_t *glyphs);
void derefGlyphs(int count, const glyph_t *glyphs);
void updateCache();
bool cacheIsFull() const { return m_textureData->currY >= maxTextureSize(); }
bool useWorkaroundBrokenFBOReadback() const;
static bool distanceFieldEnabled();
private Q_SLOTS:
void onContextDestroyed(const QGLContext *context);
private:
QSGDistanceFieldGlyphCache(const QGLContext *c, const QRawFont &font);
void createTexture(int width, int height);
void resizeTexture(int width, int height);
static QHash<QPair<const QGLContext *, QFontEngine *>, QSGDistanceFieldGlyphCache *> m_caches;
QRawFont m_font;
QRawFont m_referenceFont;
int m_glyphCount;
QHash<glyph_t, Metrics> m_metrics;
mutable int m_maxTextureSize;
struct DistanceFieldTextureData {
GLuint texture;
GLuint fbo;
QSize size;
QHash<glyph_t, TexCoord> texCoords;
QDataBuffer<glyph_t> pendingGlyphs;
QHash<glyph_t, quint32> glyphRefCount;
QSet<glyph_t> unusedGlyphs;
int currX;
int currY;
QImage image;
bool doubleGlyphResolution;
DistanceFieldTextureData(const QGLContext *)
: texture(0)
, fbo(0)
, pendingGlyphs(64)
, currX(0)
, currY(0)
, doubleGlyphResolution(false)
{ }
};
DistanceFieldTextureData *textureData();
DistanceFieldTextureData *m_textureData;
static QHash<QFontEngine *, QGLContextGroupResource<DistanceFieldTextureData> > m_textures_data;
const QGLContext *ctx;
QGLShaderProgram *m_blitProgram;
GLfloat m_vertexCoordinateArray[8];
GLfloat m_textureCoordinateArray[8];
};
QT_END_NAMESPACE
#endif // DISTANCEFIELDGLYPHCACHE_H
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