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Diffstat (limited to 'src/opengl/qopengltextureglyphcache_p.h')
| -rw-r--r-- | src/opengl/qopengltextureglyphcache_p.h | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/src/opengl/qopengltextureglyphcache_p.h b/src/opengl/qopengltextureglyphcache_p.h new file mode 100644 index 0000000000..15ecd6209b --- /dev/null +++ b/src/opengl/qopengltextureglyphcache_p.h @@ -0,0 +1,181 @@ +/**************************************************************************** +** +** Copyright (C) 2016 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the QtOpenGL 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. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#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, QFixed 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 + |