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 QtOpenGL 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 QTEXTUREGLYPHCACHE_GL_P_H 41 #define QTEXTUREGLYPHCACHE_GL_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 <private/qtextureglyphcache_p.h> 55 #include <private/qgl_p.h> 56 #include <qglshaderprogram.h> 57 #include <qglframebufferobject.h> 58 #include <qopenglfunctions.h> 59 60 // #define QT_GL_TEXTURE_GLYPH_CACHE_DEBUG 61 62 QT_BEGIN_NAMESPACE 63 64 class QGL2PaintEngineExPrivate; 65 66 struct QGLGlyphTexture : public QOpenGLSharedResource 67 { QGLGlyphTextureQGLGlyphTexture68 QGLGlyphTexture(const QGLContext *ctx) 69 : QOpenGLSharedResource(ctx->contextHandle()->shareGroup()) 70 , m_fbo(0) 71 , m_width(0) 72 , m_height(0) 73 { 74 if (ctx && QGLFramebufferObject::hasOpenGLFramebufferObjects() && !ctx->d_ptr->workaround_brokenFBOReadBack) 75 ctx->contextHandle()->functions()->glGenFramebuffers(1, &m_fbo); 76 77 #ifdef QT_GL_TEXTURE_GLYPH_CACHE_DEBUG 78 qDebug(" -> QGLGlyphTexture() %p for context %p.", this, ctx); 79 #endif 80 } 81 freeResourceQGLGlyphTexture82 void freeResource(QOpenGLContext *context) override 83 { 84 const QGLContext *ctx = QGLContext::fromOpenGLContext(context); 85 #ifdef QT_GL_TEXTURE_GLYPH_CACHE_DEBUG 86 qDebug("~QGLGlyphTexture() %p for context %p.", this, ctx); 87 #else 88 Q_UNUSED(ctx); 89 #endif 90 if (ctx && m_fbo) 91 ctx->contextHandle()->functions()->glDeleteFramebuffers(1, &m_fbo); 92 if (m_width || m_height) 93 ctx->contextHandle()->functions()->glDeleteTextures(1, &m_texture); 94 } 95 invalidateResourceQGLGlyphTexture96 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_OPENGL_EXPORT QGLTextureGlyphCache : public QImageTextureGlyphCache 111 { 112 public: 113 QGLTextureGlyphCache(QFontEngine::GlyphFormat format, const QTransform &matrix); 114 ~QGLTextureGlyphCache(); 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 QGLTextureGlyphCache *that = const_cast<QGLTextureGlyphCache *>(this); 125 QGLGlyphTexture *glyphTexture = that->m_textureResource; 126 return glyphTexture ? glyphTexture->m_texture : 0; 127 } 128 width()129 inline int width() const { 130 QGLTextureGlyphCache *that = const_cast<QGLTextureGlyphCache *>(this); 131 QGLGlyphTexture *glyphTexture = that->m_textureResource; 132 return glyphTexture ? glyphTexture->m_width : 0; 133 } height()134 inline int height() const { 135 QGLTextureGlyphCache *that = const_cast<QGLTextureGlyphCache *>(this); 136 QGLGlyphTexture *glyphTexture = that->m_textureResource; 137 return glyphTexture ? glyphTexture->m_height : 0; 138 } 139 setPaintEnginePrivate(QGL2PaintEngineExPrivate * p)140 inline void setPaintEnginePrivate(QGL2PaintEngineExPrivate *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(); 154 155 private: 156 QGLGlyphTexture *m_textureResource; 157 158 QGL2PaintEngineExPrivate *pex; 159 QGLShaderProgram *m_blitProgram; 160 FilterMode m_filterMode; 161 162 GLfloat m_vertexCoordinateArray[8]; 163 GLfloat m_textureCoordinateArray[8]; 164 165 int m_serialNumber; 166 }; 167 168 QT_END_NAMESPACE 169 170 #endif 171 172