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
64QT_BEGIN_NAMESPACE
65
66class QOpenGL2PaintEngineExPrivate;
67
68class QOpenGLGlyphTexture : public QOpenGLSharedResource
69{
70public:
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
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
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
110class Q_GUI_EXPORT QOpenGLTextureGlyphCache : public QImageTextureGlyphCache
111{
112public:
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
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
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 }
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
140 inline void setPaintEnginePrivate(QOpenGL2PaintEngineExPrivate *p) { pex = p; }
141
142 inline const QOpenGLContextGroup *contextGroup() const { return m_textureResource ? m_textureResource->group() : nullptr; }
143
144 inline int serialNumber() const { return m_serialNumber; }
145
146 enum FilterMode {
147 Nearest,
148 Linear
149 };
150 FilterMode filterMode() const { return m_filterMode; }
151 void setFilterMode(FilterMode m) { m_filterMode = m; }
152
153 void clear();
154
155 QOpenGL2PaintEngineExPrivate *paintEnginePrivate() const
156 {
157 return pex;
158 }
159
160private:
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
178QT_END_NAMESPACE
179
180#endif // QOPENGLTEXTUREGLYPHCACHE_P_H
181
182