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      1 /*
      2  * Copyright (C) 2013 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 #include "core/rendering/TextRunConstructor.h"
     33 
     34 #include "core/rendering/RenderText.h"
     35 #include "core/rendering/style/RenderStyle.h"
     36 #include "core/rendering/svg/SVGTextRunRenderingContext.h"
     37 #include "platform/text/BidiTextRun.h"
     38 
     39 namespace blink {
     40 
     41 template <typename CharacterType>
     42 static inline TextRun constructTextRunInternal(RenderObject* context, const Font& font, const CharacterType* characters, int length, RenderStyle* style, TextDirection direction, TextRun::ExpansionBehavior expansion)
     43 {
     44     ASSERT(style);
     45 
     46     bool directionalOverride = style->rtlOrdering() == VisualOrder;
     47     TextRun run(characters, length, 0, 0, expansion, direction, directionalOverride);
     48     if (textRunNeedsRenderingContext(font))
     49         run.setRenderingContext(SVGTextRunRenderingContext::create(context));
     50 
     51     return run;
     52 }
     53 
     54 template <typename CharacterType>
     55 static inline TextRun constructTextRunInternal(RenderObject* context, const Font& font, const CharacterType* characters, int length, RenderStyle* style, TextDirection direction, TextRun::ExpansionBehavior expansion, TextRunFlags flags)
     56 {
     57     ASSERT(style);
     58 
     59     TextDirection textDirection = direction;
     60     bool directionalOverride = style->rtlOrdering() == VisualOrder;
     61     if (flags != DefaultTextRunFlags) {
     62         if (flags & RespectDirection)
     63             textDirection = style->direction();
     64         if (flags & RespectDirectionOverride)
     65             directionalOverride |= isOverride(style->unicodeBidi());
     66     }
     67 
     68     TextRun run(characters, length, 0, 0, expansion, textDirection, directionalOverride);
     69     if (textRunNeedsRenderingContext(font))
     70         run.setRenderingContext(SVGTextRunRenderingContext::create(context));
     71 
     72     return run;
     73 }
     74 
     75 TextRun constructTextRun(RenderObject* context, const Font& font, const LChar* characters, int length, RenderStyle* style, TextDirection direction, TextRun::ExpansionBehavior expansion)
     76 {
     77     return constructTextRunInternal(context, font, characters, length, style, direction, expansion);
     78 }
     79 
     80 TextRun constructTextRun(RenderObject* context, const Font& font, const UChar* characters, int length, RenderStyle* style, TextDirection direction, TextRun::ExpansionBehavior expansion)
     81 {
     82     return constructTextRunInternal(context, font, characters, length, style, direction, expansion);
     83 }
     84 
     85 TextRun constructTextRun(RenderObject* context, const Font& font, const RenderText* text, RenderStyle* style, TextDirection direction, TextRun::ExpansionBehavior expansion)
     86 {
     87     if (text->is8Bit())
     88         return constructTextRunInternal(context, font, text->characters8(), text->textLength(), style, direction, expansion);
     89     return constructTextRunInternal(context, font, text->characters16(), text->textLength(), style, direction, expansion);
     90 }
     91 
     92 TextRun constructTextRun(RenderObject* context, const Font& font, const RenderText* text, unsigned offset, unsigned length, RenderStyle* style, TextDirection direction, TextRun::ExpansionBehavior expansion)
     93 {
     94     ASSERT(offset + length <= text->textLength());
     95     if (text->is8Bit())
     96         return constructTextRunInternal(context, font, text->characters8() + offset, length, style, direction, expansion);
     97     return constructTextRunInternal(context, font, text->characters16() + offset, length, style, direction, expansion);
     98 }
     99 
    100 TextRun constructTextRun(RenderObject* context, const Font& font, const String& string, RenderStyle* style, TextDirection direction, TextRun::ExpansionBehavior expansion, TextRunFlags flags)
    101 {
    102     unsigned length = string.length();
    103     if (!length)
    104         return constructTextRunInternal(context, font, static_cast<const LChar*>(0), length, style, direction, expansion, flags);
    105     if (string.is8Bit())
    106         return constructTextRunInternal(context, font, string.characters8(), length, style, direction, expansion, flags);
    107     return constructTextRunInternal(context, font, string.characters16(), length, style, direction, expansion, flags);
    108 }
    109 
    110 TextRun constructTextRun(RenderObject* context, const Font& font, const String& string, RenderStyle* style, TextRun::ExpansionBehavior expansion, TextRunFlags flags)
    111 {
    112     bool hasStrongDirectionality;
    113     return constructTextRun(context, font, string, style, determineDirectionality(string, hasStrongDirectionality), expansion, flags);
    114 }
    115 
    116 TextRun constructTextRun(RenderObject* context, const Font& font, const RenderText* text, unsigned offset, unsigned length, RenderStyle* style, TextRun::ExpansionBehavior expansion)
    117 {
    118     ASSERT(offset + length <= text->textLength());
    119     TextRun run = text->is8Bit()
    120         ? constructTextRunInternal(context, font, text->characters8() + offset, length, style, LTR, expansion)
    121         : constructTextRunInternal(context, font, text->characters16() + offset, length, style, LTR, expansion);
    122     bool hasStrongDirectionality;
    123     run.setDirection(directionForRun(run, hasStrongDirectionality));
    124     return run;
    125 }
    126 
    127 } // namespace blink
    128