1 /**************************************************************************** 2 ** 3 ** Copyright (C) 2016 The Qt Company Ltd. 4 ** Contact: https://www.qt.io/licensing/ 5 ** 6 ** This file is part of the QtGui module of the Qt Toolkit. 7 ** 8 ** $QT_BEGIN_LICENSE:LGPL$ 9 ** Commercial License Usage 10 ** Licensees holding valid commercial Qt licenses may use this file in 11 ** accordance with the commercial license agreement provided with the 12 ** Software or, alternatively, in accordance with the terms contained in 13 ** a written agreement between you and The Qt Company. For licensing terms 14 ** and conditions see https://www.qt.io/terms-conditions. For further 15 ** information use the contact form at https://www.qt.io/contact-us. 16 ** 17 ** GNU Lesser General Public License Usage 18 ** Alternatively, this file may be used under the terms of the GNU Lesser 19 ** General Public License version 3 as published by the Free Software 20 ** Foundation and appearing in the file LICENSE.LGPL3 included in the 21 ** packaging of this file. Please review the following information to 22 ** ensure the GNU Lesser General Public License version 3 requirements 23 ** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. 24 ** 25 ** GNU General Public License Usage 26 ** Alternatively, this file may be used under the terms of the GNU 27 ** General Public License version 2.0 or (at your option) the GNU General 28 ** Public license version 3 or any later version approved by the KDE Free 29 ** Qt Foundation. The licenses are as published by the Free Software 30 ** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 31 ** included in the packaging of this file. Please review the following 32 ** information to ensure the GNU General Public License requirements will 33 ** be met: https://www.gnu.org/licenses/gpl-2.0.html and 34 ** https://www.gnu.org/licenses/gpl-3.0.html. 35 ** 36 ** $QT_END_LICENSE$ 37 ** 38 ****************************************************************************/ 39 40 #ifndef QOPENGLTEXTUREGLYPHCACHE_P_H 41 #define QOPENGLTEXTUREGLYPHCACHE_P_H 42 43 // 44 // W A R N I N G 45 // ------------- 46 // 47 // This file is not part of the Qt API. It exists purely as an 48 // implementation detail. This header file may change from version to 49 // version without notice, or even be removed. 50 // 51 // We mean it. 52 // 53 54 #include <QtGui/private/qtguiglobal_p.h> 55 #include <private/qtextureglyphcache_p.h> 56 #include <private/qopenglcontext_p.h> 57 #include <qopenglshaderprogram.h> 58 #include <qopenglfunctions.h> 59 #include <qopenglbuffer.h> 60 #include <qopenglvertexarrayobject.h> 61 62 // #define QT_GL_TEXTURE_GLYPH_CACHE_DEBUG 63 64 QT_BEGIN_NAMESPACE 65 66 class QOpenGL2PaintEngineExPrivate; 67 68 class QOpenGLGlyphTexture : public QOpenGLSharedResource 69 { 70 public: QOpenGLGlyphTexture(QOpenGLContext * ctx)71 explicit QOpenGLGlyphTexture(QOpenGLContext *ctx) 72 : QOpenGLSharedResource(ctx->shareGroup()) 73 , m_width(0) 74 , m_height(0) 75 { 76 if (!ctx->d_func()->workaround_brokenFBOReadBack) 77 QOpenGLFunctions(ctx).glGenFramebuffers(1, &m_fbo); 78 79 #ifdef QT_GL_TEXTURE_GLYPH_CACHE_DEBUG 80 qDebug(" -> QOpenGLGlyphTexture() %p for context %p.", this, ctx); 81 #endif 82 } 83 freeResource(QOpenGLContext * context)84 void freeResource(QOpenGLContext *context) override 85 { 86 QOpenGLContext *ctx = context; 87 #ifdef QT_GL_TEXTURE_GLYPH_CACHE_DEBUG 88 qDebug("~QOpenGLGlyphTexture() %p for context %p.", this, ctx); 89 #endif 90 if (!ctx->d_func()->workaround_brokenFBOReadBack) 91 ctx->functions()->glDeleteFramebuffers(1, &m_fbo); 92 if (m_width || m_height) 93 ctx->functions()->glDeleteTextures(1, &m_texture); 94 } 95 invalidateResource()96 void invalidateResource() override 97 { 98 m_texture = 0; 99 m_fbo = 0; 100 m_width = 0; 101 m_height = 0; 102 } 103 104 GLuint m_texture; 105 GLuint m_fbo; 106 int m_width; 107 int m_height; 108 }; 109 110 class Q_GUI_EXPORT QOpenGLTextureGlyphCache : public QImageTextureGlyphCache 111 { 112 public: 113 QOpenGLTextureGlyphCache(QFontEngine::GlyphFormat glyphFormat, const QTransform &matrix, const QColor &color = QColor()); 114 ~QOpenGLTextureGlyphCache(); 115 116 virtual void createTextureData(int width, int height) override; 117 virtual void resizeTextureData(int width, int height) override; 118 virtual void fillTexture(const Coord &c, glyph_t glyph, QFixed subPixelPosition) override; 119 virtual int glyphPadding() const override; 120 virtual int maxTextureWidth() const override; 121 virtual int maxTextureHeight() const override; 122 texture()123 inline GLuint texture() const { 124 QOpenGLTextureGlyphCache *that = const_cast<QOpenGLTextureGlyphCache *>(this); 125 QOpenGLGlyphTexture *glyphTexture = that->m_textureResource; 126 return glyphTexture ? glyphTexture->m_texture : 0; 127 } 128 width()129 inline int width() const { 130 QOpenGLTextureGlyphCache *that = const_cast<QOpenGLTextureGlyphCache *>(this); 131 QOpenGLGlyphTexture *glyphTexture = that->m_textureResource; 132 return glyphTexture ? glyphTexture->m_width : 0; 133 } height()134 inline int height() const { 135 QOpenGLTextureGlyphCache *that = const_cast<QOpenGLTextureGlyphCache *>(this); 136 QOpenGLGlyphTexture *glyphTexture = that->m_textureResource; 137 return glyphTexture ? glyphTexture->m_height : 0; 138 } 139 setPaintEnginePrivate(QOpenGL2PaintEngineExPrivate * p)140 inline void setPaintEnginePrivate(QOpenGL2PaintEngineExPrivate *p) { pex = p; } 141 contextGroup()142 inline const QOpenGLContextGroup *contextGroup() const { return m_textureResource ? m_textureResource->group() : nullptr; } 143 serialNumber()144 inline int serialNumber() const { return m_serialNumber; } 145 146 enum FilterMode { 147 Nearest, 148 Linear 149 }; filterMode()150 FilterMode filterMode() const { return m_filterMode; } setFilterMode(FilterMode m)151 void setFilterMode(FilterMode m) { m_filterMode = m; } 152 153 void clear(); 154 paintEnginePrivate()155 QOpenGL2PaintEngineExPrivate *paintEnginePrivate() const 156 { 157 return pex; 158 } 159 160 private: 161 void setupVertexAttribs(); 162 163 QOpenGLGlyphTexture *m_textureResource; 164 165 QOpenGL2PaintEngineExPrivate *pex; 166 QOpenGLShaderProgram *m_blitProgram; 167 FilterMode m_filterMode; 168 169 GLfloat m_vertexCoordinateArray[8]; 170 GLfloat m_textureCoordinateArray[8]; 171 172 int m_serialNumber; 173 174 QOpenGLBuffer m_buffer; 175 QOpenGLVertexArrayObject m_vao; 176 }; 177 178 QT_END_NAMESPACE 179 180 #endif // QOPENGLTEXTUREGLYPHCACHE_P_H 181 182