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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::kAllowTrailingExpansion | TextRun::kForbidLeadingExpansion;
bool directional_override = style.RtlOrdering() == EOrder::kVisual;
TextRun run(characters, length, 0, 0, expansion, direction,
directional_override);
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 text_direction = direction;
bool directional_override = style.RtlOrdering() == EOrder::kVisual;
if (flags != kDefaultTextRunFlags) {
if (flags & kRespectDirection)
text_direction = style.Direction();
if (flags & kRespectDirectionOverride)
directional_override |= IsOverride(style.GetUnicodeBidi());
}
TextRun::ExpansionBehavior expansion =
TextRun::kAllowTrailingExpansion | TextRun::kForbidLeadingExpansion;
TextRun run(characters, length, 0, 0, expansion, text_direction,
directional_override);
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) {
DCHECK_LE(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()
? TextDirection::kLtr
: DetermineDirectionality(string),
flags);
}
TextRun ConstructTextRun(const Font& font,
const LineLayoutText text,
unsigned offset,
unsigned length,
const ComputedStyle& style) {
SECURITY_DCHECK(offset + length <= text.TextLength());
if (text.HasEmptyText()) {
return ConstructTextRunInternal(font, static_cast<const LChar*>(nullptr), 0,
style, TextDirection::kLtr);
}
if (text.Is8Bit()) {
return ConstructTextRunInternal(font, text.Characters8() + offset, length,
style, TextDirection::kLtr);
}
TextRun run = ConstructTextRunInternal(font, text.Characters16() + offset,
length, style, TextDirection::kLtr);
run.SetDirection(DirectionForRun(run));
return run;
}
} // namespace blink