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/*
* 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>
#include <wtf/unicode/CharacterNames.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);
// In complex text word-spacing affects each line-break, space (U+0020) and non-breaking space (U+00A0).
static bool isCodepointSpace(UChar c) { return c == ' ' || c == noBreakSpace || c == '\n'; }
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
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