Move QGLTextureGlyphCache into it's own file

Reviewed-By: Samuel

5 files changed, 350 insertions, 240 deletions

diff --git a/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp b/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp
index 7655971..b3b5fe1 100644
--- a/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp
+++ b/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp
@@ -75,15 +75,14 @@
 #include <QPaintEngine>
 #include <private/qpainter_p.h>
 #include <private/qfontengine_p.h>
-#include <private/qtextureglyphcache_p.h>
 #include <private/qpixmapdata_gl_p.h>
 #include <private/qdatabuffer_p.h>
 
 #include "qglgradientcache_p.h"
 #include "qglengineshadermanager_p.h"
 #include "qgl2pexvertexarray_p.h"
-
 #include "qtriangulatingstroker_p.h"
+#include "qtextureglyphcache_gl_p.h"
 
 #include <QDebug>
 
@@ -91,240 +90,6 @@ QT_BEGIN_NAMESPACE
 
 //#define QT_GL_NO_SCISSOR_TEST
 
-static const GLuint GL_STENCIL_HIGH_BIT         = 0x80;
-static const GLuint QT_BRUSH_TEXTURE_UNIT       = 0;
-static const GLuint QT_IMAGE_TEXTURE_UNIT       = 0; //Can be the same as brush texture unit
-static const GLuint QT_MASK_TEXTURE_UNIT        = 1;
-static const GLuint QT_BACKGROUND_TEXTURE_UNIT  = 2;
-
-#ifdef Q_WS_WIN
-extern Q_GUI_EXPORT bool qt_cleartype_enabled;
-#endif
-
-class QGLTextureGlyphCache : public QObject, public QTextureGlyphCache
-{
-    Q_OBJECT
-public:
-    QGLTextureGlyphCache(QGLContext *context, QFontEngineGlyphCache::Type type, const QTransform &matrix);
-    ~QGLTextureGlyphCache();
-
-    virtual void createTextureData(int width, int height);
-    virtual void resizeTextureData(int width, int height);
-    virtual void fillTexture(const Coord &c, glyph_t glyph);
-    virtual int glyphMargin() const;
-
-    inline GLuint texture() const { return m_texture; }
-
-    inline int width() const { return m_width; }
-    inline int height() const { return m_height; }
-
-    inline void setPaintEnginePrivate(QGL2PaintEngineExPrivate *p) { pex = p; }
-
-
-public Q_SLOTS:
-    void contextDestroyed(const QGLContext *context) {
-        if (context == ctx) {
-            const QGLContext *nextCtx = qt_gl_transfer_context(ctx);
-            if (!nextCtx) {
-                // the context may not be current, so we cannot directly
-                // destroy the fbo and texture here, but since the context
-                // is about to be destroyed, the GL server will do the
-                // clean up for us anyway
-                m_fbo = 0;
-                m_texture = 0;
-                ctx = 0;
-            } else {
-                // since the context holding the texture is shared, and
-                // about to be destroyed, we have to transfer ownership
-                // of the texture to one of the share contexts
-                ctx = const_cast<QGLContext *>(nextCtx);
-            }
-        }
-    }
-
-private:
-    QGLContext *ctx;
-
-    QGL2PaintEngineExPrivate *pex;
-
-    GLuint m_texture;
-    GLuint m_fbo;
-
-    int m_width;
-    int m_height;
-
-    QGLShaderProgram *m_program;
-};
-
-QGLTextureGlyphCache::QGLTextureGlyphCache(QGLContext *context, QFontEngineGlyphCache::Type type, const QTransform &matrix)
-    : QTextureGlyphCache(type, matrix)
-    , ctx(context)
-    , m_width(0)
-    , m_height(0)
-{
-    glGenFramebuffers(1, &m_fbo);
-    connect(QGLSignalProxy::instance(), SIGNAL(aboutToDestroyContext(const QGLContext*)),
-            SLOT(contextDestroyed(const QGLContext*)));
-}
-
-QGLTextureGlyphCache::~QGLTextureGlyphCache()
-{
-    if (ctx) {
-        QGLShareContextScope scope(ctx);
-        glDeleteFramebuffers(1, &m_fbo);
-
-        if (m_width || m_height)
-            glDeleteTextures(1, &m_texture);
-    }
-}
-
-void QGLTextureGlyphCache::createTextureData(int width, int height)
-{
-    glGenTextures(1, &m_texture);
-    glBindTexture(GL_TEXTURE_2D, m_texture);
-
-    m_width = width;
-    m_height = height;
-
-    QVarLengthArray<uchar> data(width * height);
-    for (int i = 0; i < data.size(); ++i)
-        data[i] = 0;
-
-    if (m_type == QFontEngineGlyphCache::Raster_RGBMask)
-        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_ALPHA, GL_UNSIGNED_BYTE, &data[0]);
-    else
-        glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, width, height, 0, GL_ALPHA, GL_UNSIGNED_BYTE, &data[0]);
-
-    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
-    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
-}
-
-void QGLTextureGlyphCache::resizeTextureData(int width, int height)
-{
-    // ### the QTextureGlyphCache API needs to be reworked to allow
-    // ### resizeTextureData to fail
-
-    int oldWidth = m_width;
-    int oldHeight = m_height;
-
-    GLuint oldTexture = m_texture;
-    createTextureData(width, height);
-
-    glBindFramebuffer(GL_FRAMEBUFFER_EXT, m_fbo);
-
-    GLuint tmp_texture;
-    glGenTextures(1, &tmp_texture);
-    glBindTexture(GL_TEXTURE_2D, tmp_texture);
-    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, oldWidth, oldHeight, 0,
-                 GL_RGBA, GL_UNSIGNED_BYTE, NULL);
-    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
-    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
-    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
-    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
-    glBindTexture(GL_TEXTURE_2D, 0);
-    glFramebufferTexture2D(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
-                           GL_TEXTURE_2D, tmp_texture, 0);
-
-    glActiveTexture(GL_TEXTURE0 + QT_IMAGE_TEXTURE_UNIT);
-    glBindTexture(GL_TEXTURE_2D, oldTexture);
-
-    pex->transferMode(BrushDrawingMode);
-
-    glDisable(GL_STENCIL_TEST);
-    glDisable(GL_DEPTH_TEST);
-    glDisable(GL_SCISSOR_TEST);
-    glDisable(GL_BLEND);
-
-    glViewport(0, 0, oldWidth, oldHeight);
-
-    float vertexCoordinateArray[] = { -1, -1, 1, -1, 1, 1, -1, 1 };
-    float textureCoordinateArray[] = { 0, 0, 1, 0, 1, 1, 0, 1 };
-
-    glVertexAttribPointer(QT_VERTEX_COORDS_ATTR, 2, GL_FLOAT, GL_FALSE, 0, vertexCoordinateArray);
-    glVertexAttribPointer(QT_TEXTURE_COORDS_ATTR, 2, GL_FLOAT, GL_FALSE, 0, textureCoordinateArray);
-
-    pex->shaderManager->useBlitProgram();
-    pex->shaderManager->blitProgram()->setUniformValue("imageTexture", QT_IMAGE_TEXTURE_UNIT);
-
-    glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
-
-    glBindTexture(GL_TEXTURE_2D, m_texture);
-
-#ifdef QT_OPENGL_ES_2
-    QDataBuffer<uchar> buffer(4*oldWidth*oldHeight);
-    buffer.resize(4*oldWidth*oldHeight);
-    glReadPixels(0, 0, oldWidth, oldHeight, GL_RGBA, GL_UNSIGNED_BYTE, buffer.data());
-
-    // do an in-place conversion from GL_RGBA to GL_ALPHA
-    for (int i=0; i<oldWidth*oldHeight; ++i)
-        buffer.data()[i] = buffer.at(4*i + 3);
-
-    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, oldWidth, oldHeight,
-                    GL_ALPHA, GL_UNSIGNED_BYTE, buffer.data());
-#else
-    glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, oldWidth, oldHeight);
-#endif
-
-    glFramebufferRenderbuffer(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
-                              GL_RENDERBUFFER_EXT, 0);
-    glDeleteTextures(1, &tmp_texture);
-    glDeleteTextures(1, &oldTexture);
-
-    glBindFramebuffer(GL_FRAMEBUFFER_EXT, ctx->d_ptr->current_fbo);
-
-    glViewport(0, 0, pex->width, pex->height);
-    pex->updateClipScissorTest();
-}
-
-void QGLTextureGlyphCache::fillTexture(const Coord &c, glyph_t glyph)
-{
-    QImage mask = textureMapForGlyph(glyph);
-    const int maskWidth = mask.width();
-    const int maskHeight = mask.height();
-
-    if (mask.format() == QImage::Format_Mono) {
-        mask = mask.convertToFormat(QImage::Format_Indexed8);
-        for (int y = 0; y < maskHeight; ++y) {
-            uchar *src = (uchar *) mask.scanLine(y);
-            for (int x = 0; x < maskWidth; ++x)
-                src[x] = -src[x]; // convert 0 and 1 into 0 and 255
-        }
-     }
-
-
-    glBindTexture(GL_TEXTURE_2D, m_texture);
-    if (mask.format() == QImage::Format_RGB32) {
-        glTexSubImage2D(GL_TEXTURE_2D, 0, c.x, c.y, maskWidth, maskHeight, GL_BGRA, GL_UNSIGNED_BYTE, mask.bits());
-    } else {
-#ifdef QT_OPENGL_ES2
-        glTexSubImage2D(GL_TEXTURE_2D, 0, c.x, c.y, maskWidth, maskHeight, GL_ALPHA, GL_UNSIGNED_BYTE, mask.bits());
-#else
-        // glTexSubImage2D() might cause some garbage to appear in the texture if the mask width is
-        // not a multiple of four bytes. The bug appeared on a computer with 32-bit Windows Vista
-        // and nVidia GeForce 8500GT. GL_UNPACK_ALIGNMENT is set to four bytes, 'mask' has a
-        // multiple of four bytes per line, and most of the glyph shows up correctly in the
-        // texture, which makes me think that this is a driver bug.
-        // One workaround is to make sure the mask width is a multiple of four bytes, for instance
-        // by converting it to a format with four bytes per pixel. Another is to copy one line at a
-        // time.
-
-        for (int i = 0; i < maskHeight; ++i)
-            glTexSubImage2D(GL_TEXTURE_2D, 0, c.x, c.y + i, maskWidth, 1, GL_ALPHA, GL_UNSIGNED_BYTE, mask.scanLine(i));
-#endif
-    }
-}
-
-int QGLTextureGlyphCache::glyphMargin() const
-{
-#if defined(Q_WS_MAC)
-    return 2;
-#elif defined (Q_WS_X11)
-    return 0;
-#else
-    return m_type == QFontEngineGlyphCache::Raster_RGBMask ? 2 : 0;
-#endif
-}
-
 extern QImage qt_imageForBrush(int brushStyle, bool invert);
 
 ////////////////////////////////// Private Methods //////////////////////////////////////////
@@ -2261,5 +2026,3 @@ QOpenGL2PaintEngineState::~QOpenGL2PaintEngineState()
 }
 
 QT_END_NAMESPACE
-
-#include "qpaintengineex_opengl2.moc"
diff --git a/src/opengl/gl2paintengineex/qpaintengineex_opengl2_p.h b/src/opengl/gl2paintengineex/qpaintengineex_opengl2_p.h
index 7d5cb52..eaae187 100644
--- a/src/opengl/gl2paintengineex/qpaintengineex_opengl2_p.h
+++ b/src/opengl/gl2paintengineex/qpaintengineex_opengl2_p.h
@@ -73,6 +73,12 @@ enum EngineMode {
 
 QT_BEGIN_NAMESPACE
 
+#define GL_STENCIL_HIGH_BIT         GLuint(0x80)
+#define QT_BRUSH_TEXTURE_UNIT       GLuint(0)
+#define QT_IMAGE_TEXTURE_UNIT       GLuint(0) //Can be the same as brush texture unit
+#define QT_MASK_TEXTURE_UNIT        GLuint(1)
+#define QT_BACKGROUND_TEXTURE_UNIT  GLuint(2)
+
 class QGL2PaintEngineExPrivate;
 
 
diff --git a/src/opengl/gl2paintengineex/qtextureglyphcache_gl.cpp b/src/opengl/gl2paintengineex/qtextureglyphcache_gl.cpp
new file mode 100644
index 0000000..047876f
--- /dev/null
+++ b/src/opengl/gl2paintengineex/qtextureglyphcache_gl.cpp
@@ -0,0 +1,216 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtOpenGL module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qtextureglyphcache_gl_p.h"
+#include "qpaintengineex_opengl2_p.h"
+
+#ifdef Q_WS_WIN
+extern Q_GUI_EXPORT bool qt_cleartype_enabled;
+#endif
+
+QGLTextureGlyphCache::QGLTextureGlyphCache(QGLContext *context, QFontEngineGlyphCache::Type type, const QTransform &matrix)
+    : QTextureGlyphCache(type, matrix)
+    , ctx(context)
+    , m_width(0)
+    , m_height(0)
+{
+    glGenFramebuffers(1, &m_fbo);
+    connect(QGLSignalProxy::instance(), SIGNAL(aboutToDestroyContext(const QGLContext*)),
+            SLOT(contextDestroyed(const QGLContext*)));
+}
+
+QGLTextureGlyphCache::~QGLTextureGlyphCache()
+{
+    if (ctx) {
+        QGLShareContextScope scope(ctx);
+        glDeleteFramebuffers(1, &m_fbo);
+
+        if (m_width || m_height)
+            glDeleteTextures(1, &m_texture);
+    }
+}
+
+void QGLTextureGlyphCache::createTextureData(int width, int height)
+{
+    glGenTextures(1, &m_texture);
+    glBindTexture(GL_TEXTURE_2D, m_texture);
+
+    m_width = width;
+    m_height = height;
+
+    QVarLengthArray<uchar> data(width * height);
+    for (int i = 0; i < data.size(); ++i)
+        data[i] = 0;
+
+    if (m_type == QFontEngineGlyphCache::Raster_RGBMask)
+        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_ALPHA, GL_UNSIGNED_BYTE, &data[0]);
+    else
+        glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, width, height, 0, GL_ALPHA, GL_UNSIGNED_BYTE, &data[0]);
+
+    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+}
+
+void QGLTextureGlyphCache::resizeTextureData(int width, int height)
+{
+    // ### the QTextureGlyphCache API needs to be reworked to allow
+    // ### resizeTextureData to fail
+
+    int oldWidth = m_width;
+    int oldHeight = m_height;
+
+    GLuint oldTexture = m_texture;
+    createTextureData(width, height);
+
+    glBindFramebuffer(GL_FRAMEBUFFER_EXT, m_fbo);
+
+    GLuint tmp_texture;
+    glGenTextures(1, &tmp_texture);
+    glBindTexture(GL_TEXTURE_2D, tmp_texture);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, oldWidth, oldHeight, 0,
+                 GL_RGBA, GL_UNSIGNED_BYTE, NULL);
+    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+    glBindTexture(GL_TEXTURE_2D, 0);
+    glFramebufferTexture2D(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
+                           GL_TEXTURE_2D, tmp_texture, 0);
+
+    glActiveTexture(GL_TEXTURE0 + QT_IMAGE_TEXTURE_UNIT);
+    glBindTexture(GL_TEXTURE_2D, oldTexture);
+
+    pex->transferMode(BrushDrawingMode);
+
+    glDisable(GL_STENCIL_TEST);
+    glDisable(GL_DEPTH_TEST);
+    glDisable(GL_SCISSOR_TEST);
+    glDisable(GL_BLEND);
+
+    glViewport(0, 0, oldWidth, oldHeight);
+
+    float vertexCoordinateArray[] = { -1, -1, 1, -1, 1, 1, -1, 1 };
+    float textureCoordinateArray[] = { 0, 0, 1, 0, 1, 1, 0, 1 };
+
+    glVertexAttribPointer(QT_VERTEX_COORDS_ATTR, 2, GL_FLOAT, GL_FALSE, 0, vertexCoordinateArray);
+    glVertexAttribPointer(QT_TEXTURE_COORDS_ATTR, 2, GL_FLOAT, GL_FALSE, 0, textureCoordinateArray);
+
+    pex->shaderManager->useBlitProgram();
+    pex->shaderManager->blitProgram()->setUniformValue("imageTexture", QT_IMAGE_TEXTURE_UNIT);
+
+    glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
+
+    glBindTexture(GL_TEXTURE_2D, m_texture);
+
+#ifdef QT_OPENGL_ES_2
+    QDataBuffer<uchar> buffer(4*oldWidth*oldHeight);
+    buffer.resize(4*oldWidth*oldHeight);
+    glReadPixels(0, 0, oldWidth, oldHeight, GL_RGBA, GL_UNSIGNED_BYTE, buffer.data());
+
+    // do an in-place conversion from GL_RGBA to GL_ALPHA
+    for (int i=0; i<oldWidth*oldHeight; ++i)
+        buffer.data()[i] = buffer.at(4*i + 3);
+
+    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, oldWidth, oldHeight,
+                    GL_ALPHA, GL_UNSIGNED_BYTE, buffer.data());
+#else
+    glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, oldWidth, oldHeight);
+#endif
+
+    glFramebufferRenderbuffer(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
+                              GL_RENDERBUFFER_EXT, 0);
+    glDeleteTextures(1, &tmp_texture);
+    glDeleteTextures(1, &oldTexture);
+
+    glBindFramebuffer(GL_FRAMEBUFFER_EXT, ctx->d_ptr->current_fbo);
+
+    glViewport(0, 0, pex->width, pex->height);
+    pex->updateClipScissorTest();
+}
+
+void QGLTextureGlyphCache::fillTexture(const Coord &c, glyph_t glyph)
+{
+    QImage mask = textureMapForGlyph(glyph);
+    const int maskWidth = mask.width();
+    const int maskHeight = mask.height();
+
+    if (mask.format() == QImage::Format_Mono) {
+        mask = mask.convertToFormat(QImage::Format_Indexed8);
+        for (int y = 0; y < maskHeight; ++y) {
+            uchar *src = (uchar *) mask.scanLine(y);
+            for (int x = 0; x < maskWidth; ++x)
+                src[x] = -src[x]; // convert 0 and 1 into 0 and 255
+        }
+     }
+
+
+    glBindTexture(GL_TEXTURE_2D, m_texture);
+    if (mask.format() == QImage::Format_RGB32) {
+        glTexSubImage2D(GL_TEXTURE_2D, 0, c.x, c.y, maskWidth, maskHeight, GL_BGRA, GL_UNSIGNED_BYTE, mask.bits());
+    } else {
+#ifdef QT_OPENGL_ES2
+        glTexSubImage2D(GL_TEXTURE_2D, 0, c.x, c.y, maskWidth, maskHeight, GL_ALPHA, GL_UNSIGNED_BYTE, mask.bits());
+#else
+        // glTexSubImage2D() might cause some garbage to appear in the texture if the mask width is
+        // not a multiple of four bytes. The bug appeared on a computer with 32-bit Windows Vista
+        // and nVidia GeForce 8500GT. GL_UNPACK_ALIGNMENT is set to four bytes, 'mask' has a
+        // multiple of four bytes per line, and most of the glyph shows up correctly in the
+        // texture, which makes me think that this is a driver bug.
+        // One workaround is to make sure the mask width is a multiple of four bytes, for instance
+        // by converting it to a format with four bytes per pixel. Another is to copy one line at a
+        // time.
+
+        for (int i = 0; i < maskHeight; ++i)
+            glTexSubImage2D(GL_TEXTURE_2D, 0, c.x, c.y + i, maskWidth, 1, GL_ALPHA, GL_UNSIGNED_BYTE, mask.scanLine(i));
+#endif
+    }
+}
+
+int QGLTextureGlyphCache::glyphMargin() const
+{
+#if defined(Q_WS_MAC)
+    return 2;
+#elif defined (Q_WS_X11)
+    return 0;
+#else
+    return m_type == QFontEngineGlyphCache::Raster_RGBMask ? 2 : 0;
+#endif
+}
diff --git a/src/opengl/gl2paintengineex/qtextureglyphcache_gl_p.h b/src/opengl/gl2paintengineex/qtextureglyphcache_gl_p.h
new file mode 100644
index 0000000..393893c
--- /dev/null
+++ b/src/opengl/gl2paintengineex/qtextureglyphcache_gl_p.h
@@ -0,0 +1,123 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtOpenGL module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QTEXTUREGLYPHCACHE_GL_P_H
+#define QTEXTUREGLYPHCACHE_GL_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of the QLibrary class.  This header file may change from
+// version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <private/qtextureglyphcache_p.h>
+#include <private/qgl_p.h>
+#include <qglshaderprogram.h>
+
+
+QT_BEGIN_NAMESPACE
+
+class QGL2PaintEngineExPrivate;
+
+class QGLTextureGlyphCache : public QObject, public QTextureGlyphCache
+{
+    Q_OBJECT
+public:
+    QGLTextureGlyphCache(QGLContext *context, QFontEngineGlyphCache::Type type, const QTransform &matrix);
+    ~QGLTextureGlyphCache();
+
+    virtual void createTextureData(int width, int height);
+    virtual void resizeTextureData(int width, int height);
+    virtual void fillTexture(const Coord &c, glyph_t glyph);
+    virtual int glyphMargin() const;
+
+    inline GLuint texture() const { return m_texture; }
+
+    inline int width() const { return m_width; }
+    inline int height() const { return m_height; }
+
+    inline void setPaintEnginePrivate(QGL2PaintEngineExPrivate *p) { pex = p; }
+
+
+public Q_SLOTS:
+    void contextDestroyed(const QGLContext *context) {
+        if (context == ctx) {
+            const QGLContext *nextCtx = qt_gl_transfer_context(ctx);
+            if (!nextCtx) {
+                // the context may not be current, so we cannot directly
+                // destroy the fbo and texture here, but since the context
+                // is about to be destroyed, the GL server will do the
+                // clean up for us anyway
+                m_fbo = 0;
+                m_texture = 0;
+                ctx = 0;
+            } else {
+                // since the context holding the texture is shared, and
+                // about to be destroyed, we have to transfer ownership
+                // of the texture to one of the share contexts
+                ctx = const_cast<QGLContext *>(nextCtx);
+            }
+        }
+    }
+
+private:
+    QGLContext *ctx;
+
+    QGL2PaintEngineExPrivate *pex;
+
+    GLuint m_texture;
+    GLuint m_fbo;
+
+    int m_width;
+    int m_height;
+
+    QGLShaderProgram *m_program;
+};
+
+QT_END_NAMESPACE
+
+#endif
+
diff --git a/src/opengl/opengl.pro b/src/opengl/opengl.pro
index b2474ed..6076891 100644
--- a/src/opengl/opengl.pro
+++ b/src/opengl/opengl.pro
@@ -54,7 +54,8 @@ SOURCES	+= qgl.cpp \
                 gl2paintengineex/qpaintengineex_opengl2_p.h \
                 gl2paintengineex/qglengineshadersource_p.h \
                 gl2paintengineex/qglcustomshaderstage_p.h \
-                gl2paintengineex/qtriangulatingstroker_p.h
+                gl2paintengineex/qtriangulatingstroker_p.h \
+                gl2paintengineex/qtextureglyphcache_gl_p.h
 
     SOURCES +=  qglshaderprogram.cpp \
                 qglpixmapfilter.cpp \
@@ -67,7 +68,8 @@ SOURCES	+= qgl.cpp \
                 gl2paintengineex/qgl2pexvertexarray.cpp \
                 gl2paintengineex/qpaintengineex_opengl2.cpp \
                 gl2paintengineex/qglcustomshaderstage.cpp \
-                gl2paintengineex/qtriangulatingstroker.cpp
+                gl2paintengineex/qtriangulatingstroker.cpp \
+                gl2paintengineex/qtextureglyphcache_gl.cpp
 
 }