/* * 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 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * 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