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Diffstat (limited to 'src/gui/painting/qtextureglyphcache_p.h')
-rw-r--r-- | src/gui/painting/qtextureglyphcache_p.h | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/src/gui/painting/qtextureglyphcache_p.h b/src/gui/painting/qtextureglyphcache_p.h new file mode 100644 index 0000000000..922e2901bd --- /dev/null +++ b/src/gui/painting/qtextureglyphcache_p.h @@ -0,0 +1,189 @@ +/**************************************************************************** +** +** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the QtGui 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_P_H +#define QTEXTUREGLYPHCACHE_P_H + +// +// W A R N I N G +// ------------- +// +// This file is not part of the Qt API. It exists for the convenience +// of other Qt classes. This header file may change from version to +// version without notice, or even be removed. +// +// We mean it. +// + +#include <qhash.h> +#include <qimage.h> +#include <qobject.h> +#include <qtransform.h> + +#include <private/qfontengineglyphcache_p.h> + +#if defined(Q_OS_VXWORKS) && defined(m_type) +# undef m_type +#endif + +#ifndef QT_DEFAULT_TEXTURE_GLYPH_CACHE_WIDTH +#define QT_DEFAULT_TEXTURE_GLYPH_CACHE_WIDTH 256 +#endif + +struct glyph_metrics_t; +typedef unsigned int glyph_t; + + +QT_BEGIN_NAMESPACE + +class QTextItemInt; + +class Q_GUI_EXPORT QTextureGlyphCache : public QFontEngineGlyphCache +{ +public: + QTextureGlyphCache(QFontEngineGlyphCache::Type type, const QTransform &matrix) + : QFontEngineGlyphCache(matrix, type), m_current_fontengine(0), + m_w(0), m_h(0), m_cx(0), m_cy(0), m_currentRowHeight(0), m_subPixelPositionCount(0) + { } + + virtual ~QTextureGlyphCache() { } + + struct GlyphAndSubPixelPosition + { + GlyphAndSubPixelPosition(glyph_t g, QFixed spp) : glyph(g), subPixelPosition(spp) {} + + bool operator==(const GlyphAndSubPixelPosition &other) const + { + return glyph == other.glyph && subPixelPosition == other.subPixelPosition; + } + + glyph_t glyph; + QFixed subPixelPosition; + }; + + struct Coord { + int x; + int y; + int w; + int h; + + int baseLineX; + int baseLineY; + + bool isNull() const + { + return w == 0 || h == 0; + } + }; + + bool populate(QFontEngine *fontEngine, int numGlyphs, const glyph_t *glyphs, + const QFixedPoint *positions); + void fillInPendingGlyphs(); + + virtual void createTextureData(int width, int height) = 0; + virtual void resizeTextureData(int width, int height) = 0; + virtual int glyphMargin() const { return 0; } + virtual int glyphPadding() const { return 0; } + + virtual void fillTexture(const Coord &coord, glyph_t glyph, QFixed subPixelPosition) = 0; + + inline void createCache(int width, int height) { + m_w = width; + m_h = height; + createTextureData(width, height); + } + + inline void resizeCache(int width, int height) + { + resizeTextureData(width, height); + m_w = width; + m_h = height; + } + + inline bool isNull() const { return m_h == 0; } + + QHash<GlyphAndSubPixelPosition, Coord> coords; + virtual int maxTextureWidth() const { return QT_DEFAULT_TEXTURE_GLYPH_CACHE_WIDTH; } + virtual int maxTextureHeight() const { return -1; } + + QImage textureMapForGlyph(glyph_t g, QFixed subPixelPosition) const; + + QFixed subPixelPositionForX(QFixed x) const; + +protected: + int calculateSubPixelPositionCount(glyph_t) const; + + QFontEngine *m_current_fontengine; + QHash<GlyphAndSubPixelPosition, Coord> m_pendingGlyphs; + + int m_w; // image width + int m_h; // image height + int m_cx; // current x + int m_cy; // current y + int m_currentRowHeight; // Height of last row + int m_subPixelPositionCount; // Number of positions within a single pixel for this cache +}; + +inline uint qHash(const QTextureGlyphCache::GlyphAndSubPixelPosition &g) +{ + return (g.glyph << 8) | (g.subPixelPosition * 10).round().toInt(); +} + + +class Q_GUI_EXPORT QImageTextureGlyphCache : public QTextureGlyphCache +{ +public: + QImageTextureGlyphCache(QFontEngineGlyphCache::Type type, const QTransform &matrix) + : QTextureGlyphCache(type, matrix) { } + virtual int glyphMargin() const; + virtual void createTextureData(int width, int height); + virtual void resizeTextureData(int width, int height); + virtual void fillTexture(const Coord &c, glyph_t glyph, QFixed subPixelPosition); + + inline const QImage &image() const { return m_image; } + +private: + QImage m_image; +}; + +QT_END_NAMESPACE + +#endif |