/* * Copyright (C) 2012 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 HarfBuzzShaperBase_h #define HarfBuzzShaperBase_h #include "TextRun.h" #include <wtf/OwnArrayPtr.h> namespace WebCore { class Font; class HarfBuzzShaperBase { public: enum NormalizeMode { DoNotNormalizeMirrorChars, NormalizeMirrorChars }; HarfBuzzShaperBase(const Font*, const TextRun&); virtual ~HarfBuzzShaperBase() { } protected: void setNormalizedBuffer(NormalizeMode = DoNotNormalizeMirrorChars); bool isWordEnd(unsigned); int determineWordBreakSpacing(); // setPadding sets a number of pixels to be distributed across the TextRun. // WebKit uses this to justify text. void setPadding(int); // This matches the logic in RenderBlock::findNextLineBreak static bool isCodepointSpace(UChar c) { return c == ' ' || c == '\t'; } const Font* m_font; OwnArrayPtr<UChar> m_normalizedBuffer; unsigned m_normalizedBufferLength; const TextRun& m_run; int m_wordSpacingAdjustment; // delta adjustment (pixels) for each word break. float m_padding; // pixels to be distributed over the line at word breaks. float m_padPerWordBreak; // pixels to be added to each word break. float m_padError; // |m_padPerWordBreak| might have a fractional component. // Since we only add a whole number of padding pixels at // each word break we accumulate error. This is the // number of pixels that we are behind so far. int m_letterSpacing; // pixels to be added after each glyph. }; } // namespace WebCore #endif // HarfBuzzShaperBase_h