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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QOPENGLTEXTUREGLYPHCACHE_P_H
#define QOPENGLTEXTUREGLYPHCACHE_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <QtOpenGL/qtopenglglobal.h>
#include <private/qtextureglyphcache_p.h>
#include <private/qopenglcontext_p.h>
#include <qopenglshaderprogram.h>
#include <qopenglfunctions.h>
#include <qopenglbuffer.h>
#include <qopenglvertexarrayobject.h>
// #define QT_GL_TEXTURE_GLYPH_CACHE_DEBUG
QT_BEGIN_NAMESPACE
class QOpenGL2PaintEngineExPrivate;
class QOpenGLGlyphTexture : public QOpenGLSharedResource
{
public:
explicit QOpenGLGlyphTexture(QOpenGLContext *ctx)
: QOpenGLSharedResource(ctx->shareGroup())
, m_width(0)
, m_height(0)
{
if (!ctx->d_func()->workaround_brokenFBOReadBack)
QOpenGLFunctions(ctx).glGenFramebuffers(1, &m_fbo);
#ifdef QT_GL_TEXTURE_GLYPH_CACHE_DEBUG
qDebug(" -> QOpenGLGlyphTexture() %p for context %p.", this, ctx);
#endif
}
void freeResource(QOpenGLContext *context) override
{
QOpenGLContext *ctx = context;
#ifdef QT_GL_TEXTURE_GLYPH_CACHE_DEBUG
qDebug("~QOpenGLGlyphTexture() %p for context %p.", this, ctx);
#endif
if (!ctx->d_func()->workaround_brokenFBOReadBack)
ctx->functions()->glDeleteFramebuffers(1, &m_fbo);
if (m_width || m_height)
ctx->functions()->glDeleteTextures(1, &m_texture);
}
void invalidateResource() override
{
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 QOpenGLTextureGlyphCache : public QImageTextureGlyphCache
{
public:
QOpenGLTextureGlyphCache(QFontEngine::GlyphFormat glyphFormat, const QTransform &matrix, const QColor &color = QColor());
~QOpenGLTextureGlyphCache();
virtual void createTextureData(int width, int height) override;
virtual void resizeTextureData(int width, int height) override;
virtual void fillTexture(const Coord &c,
glyph_t glyph,
const QFixedPoint &subPixelPosition) override;
virtual int glyphPadding() const override;
virtual int maxTextureWidth() const override;
virtual int maxTextureHeight() const override;
inline GLuint texture() const {
QOpenGLTextureGlyphCache *that = const_cast<QOpenGLTextureGlyphCache *>(this);
QOpenGLGlyphTexture *glyphTexture = that->m_textureResource;
return glyphTexture ? glyphTexture->m_texture : 0;
}
inline int width() const {
QOpenGLTextureGlyphCache *that = const_cast<QOpenGLTextureGlyphCache *>(this);
QOpenGLGlyphTexture *glyphTexture = that->m_textureResource;
return glyphTexture ? glyphTexture->m_width : 0;
}
inline int height() const {
QOpenGLTextureGlyphCache *that = const_cast<QOpenGLTextureGlyphCache *>(this);
QOpenGLGlyphTexture *glyphTexture = that->m_textureResource;
return glyphTexture ? glyphTexture->m_height : 0;
}
inline void setPaintEnginePrivate(QOpenGL2PaintEngineExPrivate *p) { pex = p; }
inline const QOpenGLContextGroup *contextGroup() const { return m_textureResource ? m_textureResource->group() : nullptr; }
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();
QOpenGL2PaintEngineExPrivate *paintEnginePrivate() const
{
return pex;
}
private:
void setupVertexAttribs();
QOpenGLGlyphTexture *m_textureResource;
QOpenGL2PaintEngineExPrivate *pex;
QOpenGLShaderProgram *m_blitProgram;
FilterMode m_filterMode;
GLfloat m_vertexCoordinateArray[8];
GLfloat m_textureCoordinateArray[8];
int m_serialNumber;
QOpenGLBuffer m_buffer;
QOpenGLVertexArrayObject m_vao;
};
QT_END_NAMESPACE
#endif // QOPENGLTEXTUREGLYPHCACHE_P_H
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