| /* |
| * Copyright (c) 2010 Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef ComplexTextControllerHarfBuzz_h |
| #define ComplexTextControllerHarfBuzz_h |
| |
| #include "HarfBuzzShaperBase.h" |
| #include "HarfBuzzSkia.h" |
| #include "SkPoint.h" |
| #include "SkScalar.h" |
| #include "TextRun.h" |
| |
| extern "C" { |
| #include "harfbuzz-shaper.h" |
| } |
| |
| #include <unicode/uchar.h> |
| #include <wtf/OwnArrayPtr.h> |
| #include <wtf/OwnPtr.h> |
| |
| namespace WebCore { |
| |
| class Font; |
| class FontPlatformData; |
| class SimpleFontData; |
| |
| // ComplexTextController walks a TextRun and presents each script run in sequence. A |
| // TextRun is a sequence of code-points with the same embedding level (i.e. they |
| // are all left-to-right or right-to-left). A script run is a subsequence where |
| // all the characters have the same script (e.g. Arabic, Thai etc). Shaping is |
| // only ever done with script runs since the shapers only know how to deal with |
| // a single script. |
| // |
| // Iteration is always in logical (aka reading) order. For RTL text that means |
| // the rightmost part of the text will be first. |
| // |
| // Once you have setup the object, call |nextScriptRun| to get the first script |
| // run. This will return false when the iteration is complete. At any time you |
| // can call |reset| to start over again. |
| class ComplexTextController : public HarfBuzzShaperBase { |
| public: |
| ComplexTextController(const Font*, const TextRun&, int startingX, int startingY); |
| virtual ~ComplexTextController(); |
| |
| void reset(int offset); |
| // Advance to the next script run, returning false when the end of the |
| // TextRun has been reached. |
| bool nextScriptRun(); |
| float widthOfFullRun(); |
| |
| void setupForRTL(); |
| bool rtl() const { return m_run.rtl(); } |
| const uint16_t* glyphs() const { return m_glyphs16; } |
| |
| // Return the start index and length of glyphs for the range [from, to) in the current script run. |
| void glyphsForRange(int from, int to, int& fromGlyph, int& glyphLength); |
| |
| // Return the length of the array returned by |glyphs| |
| unsigned length() const { return m_item.num_glyphs; } |
| |
| // Return the offset for each of the glyphs. Note that this is translated |
| // by the current x offset and that the x offset is updated for each script |
| // run. |
| const SkPoint* positions() const { return m_positions; } |
| |
| // return the number of code points in the current script run |
| unsigned numCodePoints() const { return m_item.item.length; } |
| |
| // Return the current pixel position of the controller. |
| unsigned offsetX() const { return m_offsetX; } |
| |
| const FontPlatformData* fontPlatformDataForScriptRun() { return reinterpret_cast<FontPlatformData*>(m_item.font->userData); } |
| |
| int offsetForPosition(int); |
| FloatRect selectionRect(const FloatPoint&, int height, int from , int to); |
| |
| private: |
| // Return the width (in px) of the current script run. |
| unsigned width() const { return m_pixelWidth; } |
| |
| const FontPlatformData* getComplexFontPlatformData(); |
| void setupFontForScriptRun(); |
| void deleteGlyphArrays(); |
| void createGlyphArrays(int); |
| void resetGlyphArrays(); |
| void shapeGlyphs(); |
| void setGlyphPositions(bool); |
| |
| int glyphIndexForXPositionInScriptRun(int targetX) const; |
| |
| const SimpleFontData* m_currentFontData; |
| HB_ShaperItem m_item; |
| uint16_t* m_glyphs16; // A vector of 16-bit glyph ids. |
| SkPoint* m_positions; // A vector of positions for each glyph. |
| ssize_t m_indexOfNextScriptRun; // Indexes the script run in |m_run|. |
| int m_offsetX; // Offset in pixels to the start of the next script run. |
| int m_startingY; // The Y starting point of the script run. |
| unsigned m_pixelWidth; // Width (in px) of the current script run. |
| unsigned m_glyphsArrayCapacity; // Current size of all the Harfbuzz arrays. |
| |
| String m_smallCapsString; // substring of m_run converted to small caps. |
| }; |
| |
| } // namespace WebCore |
| |
| #endif // ComplexTextControllerHarfBuzz_h |