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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: http://www.qt-project.org/
**
** This file is part of the QtOpenGL 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 QTEXTUREGLYPHCACHE_GL_P_H
#define QTEXTUREGLYPHCACHE_GL_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists for the convenience
// of the QLibrary class. This header file may change from
// version to version without notice, or even be removed.
//
// We mean it.
//
#include <private/qtextureglyphcache_p.h>
#include <private/qgl_p.h>
#include <qglshaderprogram.h>
#include <qglframebufferobject.h>
// #define QT_GL_TEXTURE_GLYPH_CACHE_DEBUG
QT_BEGIN_NAMESPACE
class QGL2PaintEngineExPrivate;
struct QGLGlyphTexture : public QOpenGLSharedResource
{
QGLGlyphTexture(const QGLContext *ctx)
: QOpenGLSharedResource(ctx->contextHandle()->shareGroup())
, m_fbo(0)
, m_width(0)
, m_height(0)
{
if (ctx && QGLFramebufferObject::hasOpenGLFramebufferObjects() && !ctx->d_ptr->workaround_brokenFBOReadBack)
glGenFramebuffers(1, &m_fbo);
#ifdef QT_GL_TEXTURE_GLYPH_CACHE_DEBUG
qDebug(" -> QGLGlyphTexture() %p for context %p.", this, ctx);
#endif
}
void freeResource(QOpenGLContext *context)
{
const QGLContext *ctx = QGLContext::fromOpenGLContext(context);
#ifdef QT_GL_TEXTURE_GLYPH_CACHE_DEBUG
qDebug("~QGLGlyphTexture() %p for context %p.", this, ctx);
#endif
if (m_fbo)
glDeleteFramebuffers(1, &m_fbo);
if (m_width || m_height)
glDeleteTextures(1, &m_texture);
}
void invalidateResource()
{
m_texture = 0;
m_fbo = 0;
m_width = 0;
m_height = 0;
}
GLuint m_texture;
GLuint m_fbo;
int m_width;
int m_height;
};
class Q_OPENGL_EXPORT QGLTextureGlyphCache : public QImageTextureGlyphCache
{
public:
QGLTextureGlyphCache(QFontEngineGlyphCache::Type type, const QTransform &matrix);
~QGLTextureGlyphCache();
virtual void createTextureData(int width, int height);
virtual void resizeTextureData(int width, int height);
virtual void fillTexture(const Coord &c, glyph_t glyph, QFixed subPixelPosition);
virtual int glyphPadding() const;
virtual int maxTextureWidth() const;
virtual int maxTextureHeight() const;
inline GLuint texture() const {
QGLTextureGlyphCache *that = const_cast<QGLTextureGlyphCache *>(this);
QGLGlyphTexture *glyphTexture = that->m_textureResource;
return glyphTexture ? glyphTexture->m_texture : 0;
}
inline int width() const {
QGLTextureGlyphCache *that = const_cast<QGLTextureGlyphCache *>(this);
QGLGlyphTexture *glyphTexture = that->m_textureResource;
return glyphTexture ? glyphTexture->m_width : 0;
}
inline int height() const {
QGLTextureGlyphCache *that = const_cast<QGLTextureGlyphCache *>(this);
QGLGlyphTexture *glyphTexture = that->m_textureResource;
return glyphTexture ? glyphTexture->m_height : 0;
}
inline void setPaintEnginePrivate(QGL2PaintEngineExPrivate *p) { pex = p; }
inline const QOpenGLContextGroup *contextGroup() const { return m_textureResource ? m_textureResource->group() : 0; }
inline int serialNumber() const { return m_serialNumber; }
enum FilterMode {
Nearest,
Linear
};
FilterMode filterMode() const { return m_filterMode; }
void setFilterMode(FilterMode m) { m_filterMode = m; }
void clear();
private:
QGLGlyphTexture *m_textureResource;
QGL2PaintEngineExPrivate *pex;
QGLShaderProgram *m_blitProgram;
FilterMode m_filterMode;
GLfloat m_vertexCoordinateArray[8];
GLfloat m_textureCoordinateArray[8];
int m_serialNumber;
};
QT_END_NAMESPACE
#endif
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