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Diffstat (limited to 'src/quick/scenegraph/qsgdefaultdistancefieldglyphcache_p.h')
| -rw-r--r-- | src/quick/scenegraph/qsgdefaultdistancefieldglyphcache_p.h | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/src/quick/scenegraph/qsgdefaultdistancefieldglyphcache_p.h b/src/quick/scenegraph/qsgdefaultdistancefieldglyphcache_p.h new file mode 100644 index 0000000000..b52ec45107 --- /dev/null +++ b/src/quick/scenegraph/qsgdefaultdistancefieldglyphcache_p.h @@ -0,0 +1,165 @@ +/**************************************************************************** +** +** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the QtDeclarative module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** GNU Lesser General Public License Usage +** 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. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU General +** Public License version 3.0 as published by the Free Software Foundation +** and appearing in the file LICENSE.GPL included in the packaging of this +** file. Please review the following information to ensure the GNU General +** Public License version 3.0 requirements will be met: +** http://www.gnu.org/copyleft/gpl.html. +** +** Other Usage +** Alternatively, this file may be used in accordance with the terms and +** conditions contained in a signed written agreement between you and Nokia. +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#ifndef QSGDEFAULTDISTANCEFIELDGLYPHCACHE_H +#define QSGDEFAULTDISTANCEFIELDGLYPHCACHE_H + +#include <QtGui/qopenglfunctions.h> +#include <private/qsgadaptationlayer_p.h> +#include <qopenglshaderprogram.h> +#include <QtGui/private/qopenglengineshadersource_p.h> + +QT_BEGIN_NAMESPACE + +class Q_QUICK_EXPORT QSGDefaultDistanceFieldGlyphCache : public QSGDistanceFieldGlyphCache +{ +public: + QSGDefaultDistanceFieldGlyphCache(QSGDistanceFieldGlyphCacheManager *man, QOpenGLContext *c, const QRawFont &font); + + void requestGlyphs(const QVector<glyph_t> &glyphs); + void storeGlyphs(const QHash<glyph_t, QImage> &glyphs); + void releaseGlyphs(const QVector<glyph_t> &glyphs); + + bool cacheIsFull() const { return m_textureData->currY >= maxTextureSize(); } + bool useWorkaroundBrokenFBOReadback() const; + int maxTextureSize() const; + +private: + void createTexture(int width, int height); + void resizeTexture(int width, int height); + + mutable int m_maxTextureSize; + + struct DistanceFieldTextureData : public QOpenGLSharedResource { + GLuint texture; + GLuint fbo; + QSize size; + QHash<glyph_t, quint32> glyphRefCount; + QSet<glyph_t> unusedGlyphs; + int currX; + int currY; + QImage image; + + QOpenGLShaderProgram *blitProgram; + GLfloat blitVertexCoordinateArray[8]; + GLfloat blitTextureCoordinateArray[8]; + + DistanceFieldTextureData(QOpenGLContext *ctx) + : QOpenGLSharedResource(ctx->shareGroup()) + , texture(0) + , fbo(0) + , currX(0) + , currY(0) + , blitProgram(0) + { + blitVertexCoordinateArray[0] = -1.0f; + blitVertexCoordinateArray[1] = -1.0f; + blitVertexCoordinateArray[2] = 1.0f; + blitVertexCoordinateArray[3] = -1.0f; + blitVertexCoordinateArray[4] = 1.0f; + blitVertexCoordinateArray[5] = 1.0f; + blitVertexCoordinateArray[6] = -1.0f; + blitVertexCoordinateArray[7] = 1.0f; + + blitTextureCoordinateArray[0] = 0.0f; + blitTextureCoordinateArray[1] = 0.0f; + blitTextureCoordinateArray[2] = 1.0f; + blitTextureCoordinateArray[3] = 0.0f; + blitTextureCoordinateArray[4] = 1.0f; + blitTextureCoordinateArray[5] = 1.0f; + blitTextureCoordinateArray[6] = 0.0f; + blitTextureCoordinateArray[7] = 1.0f; + } + + void invalidateResource() + { + texture = 0; + fbo = 0; + size = QSize(); + delete blitProgram; + blitProgram = 0; + } + + void freeResource(QOpenGLContext *ctx) + { + glDeleteTextures(1, &texture); + ctx->functions()->glDeleteFramebuffers(1, &fbo); + delete blitProgram; + blitProgram = 0; + } + + void createBlitProgram() + { + blitProgram = new QOpenGLShaderProgram; + { + QString source; + source.append(QLatin1String(qopenglslMainWithTexCoordsVertexShader)); + source.append(QLatin1String(qopenglslUntransformedPositionVertexShader)); + + QOpenGLShader *vertexShader = new QOpenGLShader(QOpenGLShader::Vertex, blitProgram); + vertexShader->compileSourceCode(source); + + blitProgram->addShader(vertexShader); + } + { + QString source; + source.append(QLatin1String(qopenglslMainFragmentShader)); + source.append(QLatin1String(qopenglslImageSrcFragmentShader)); + + QOpenGLShader *fragmentShader = new QOpenGLShader(QOpenGLShader::Fragment, blitProgram); + fragmentShader->compileSourceCode(source); + + blitProgram->addShader(fragmentShader); + } + blitProgram->bindAttributeLocation("vertexCoordsArray", QT_VERTEX_COORDS_ATTR); + blitProgram->bindAttributeLocation("textureCoordArray", QT_TEXTURE_COORDS_ATTR); + blitProgram->link(); + } + }; + + DistanceFieldTextureData *textureData(QOpenGLContext *c); + DistanceFieldTextureData *m_textureData; + static QHash<QString, QOpenGLMultiGroupSharedResource> m_textures_data; +}; + +QT_END_NAMESPACE + +#endif // QSGDEFAULTDISTANCEFIELDGLYPHCACHE_H |