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/*
* Copyright (C) 2013 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.
*/
#include "core/layout/TextRunConstructor.h"
#include "core/layout/LayoutText.h"
#include "core/layout/api/LineLayoutItem.h"
#include "core/layout/api/LineLayoutText.h"
#include "platform/text/BidiTextRun.h"
namespace blink {
template <typename CharacterType>
static inline TextRun constructTextRunInternal(const Font& font, const CharacterType* characters, int length, const ComputedStyle& style, TextDirection direction)
{
TextRun::ExpansionBehavior expansion = TextRun::AllowTrailingExpansion | TextRun::ForbidLeadingExpansion;
bool directionalOverride = style.rtlOrdering() == VisualOrder;
TextRun run(characters, length, 0, 0, expansion, direction, directionalOverride);
return run;
}
template <typename CharacterType>
static inline TextRun constructTextRunInternal(const Font& font, const CharacterType* characters, int length, const ComputedStyle& style, TextDirection direction, TextRunFlags flags)
{
TextDirection textDirection = direction;
bool directionalOverride = style.rtlOrdering() == VisualOrder;
if (flags != DefaultTextRunFlags) {
if (flags & RespectDirection)
textDirection = style.direction();
if (flags & RespectDirectionOverride)
directionalOverride |= isOverride(style.unicodeBidi());
}
TextRun::ExpansionBehavior expansion = TextRun::AllowTrailingExpansion | TextRun::ForbidLeadingExpansion;
TextRun run(characters, length, 0, 0, expansion, textDirection, directionalOverride);
return run;
}
TextRun constructTextRun(const Font& font, const LChar* characters, int length, const ComputedStyle& style, TextDirection direction)
{
return constructTextRunInternal(font, characters, length, style, direction);
}
TextRun constructTextRun(const Font& font, const UChar* characters, int length, const ComputedStyle& style, TextDirection direction)
{
return constructTextRunInternal(font, characters, length, style, direction);
}
TextRun constructTextRun(const Font& font, const LayoutText* text, unsigned offset, unsigned length, const ComputedStyle& style, TextDirection direction)
{
ASSERT(offset + length <= text->textLength());
if (text->hasEmptyText())
return constructTextRunInternal(font, static_cast<const LChar*>(nullptr), 0, style, direction);
if (text->is8Bit())
return constructTextRunInternal(font, text->characters8() + offset, length, style, direction);
return constructTextRunInternal(font, text->characters16() + offset, length, style, direction);
}
TextRun constructTextRun(const Font& font, const String& string, const ComputedStyle& style, TextDirection direction, TextRunFlags flags)
{
unsigned length = string.length();
if (!length)
return constructTextRunInternal(font, static_cast<const LChar*>(nullptr), length, style, direction, flags);
if (string.is8Bit())
return constructTextRunInternal(font, string.characters8(), length, style, direction, flags);
return constructTextRunInternal(font, string.characters16(), length, style, direction, flags);
}
TextRun constructTextRun(const Font& font, const String& string, const ComputedStyle& style, TextRunFlags flags)
{
return constructTextRun(font, string, style, string.isEmpty() || string.is8Bit() ? LTR : determineDirectionality(string), flags);
}
TextRun constructTextRun(const Font& font, const LineLayoutText text, unsigned offset, unsigned length, const ComputedStyle& style)
{
ASSERT(offset + length <= text.textLength());
if (text.hasEmptyText())
return constructTextRunInternal(font, static_cast<const LChar*>(nullptr), 0, style, LTR);
if (text.is8Bit())
return constructTextRunInternal(font, text.characters8() + offset, length, style, LTR);
TextRun run = constructTextRunInternal(font, text.characters16() + offset, length, style, LTR);
run.setDirection(directionForRun(run));
return run;
}
} // namespace blink
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