Expose InlineTextBoxes in the accessibility tree.

Source/core/rendering/InlineTextBox.cpp

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 17 matching lines @@
 #include "core/dom/RenderedDocumentMarker.h"
 #include "core/dom/Text.h"
 #include "core/editing/Editor.h"
 #include "core/editing/InputMethodController.h"
 #include "core/frame/Frame.h"
 #include "core/page/Page.h"
 #include "core/page/Settings.h"
 #include "core/platform/graphics/DrawLooper.h"
 #include "core/platform/graphics/FontCache.h"
 #include "core/platform/graphics/GraphicsContextStateSaver.h"
+#include "core/platform/graphics/WidthIterator.h"
+#include "core/rendering/AbstractInlineTextBox.h"
 #include "core/rendering/EllipsisBox.h"
 #include "core/rendering/HitTestResult.h"
 #include "core/rendering/PaintInfo.h"
 #include "core/rendering/RenderBR.h"
 #include "core/rendering/RenderBlock.h"
 #include "core/rendering/RenderCombineText.h"
 #include "core/rendering/RenderRubyRun.h"
 #include "core/rendering/RenderRubyText.h"
 #include "core/rendering/RenderTheme.h"
 #include "core/rendering/style/ShadowData.h"
@@ skipping 14 matching lines @@
 
 COMPILE_ASSERT(sizeof(InlineTextBox) == sizeof(SameSizeAsInlineTextBox), InlineTextBox_should_stay_small);
 
 typedef WTF::HashMap<const InlineTextBox*, LayoutRect> InlineTextBoxOverflowMap;
 static InlineTextBoxOverflowMap* gTextBoxesWithOverflow;
 
 static const int misspellingLineThickness = 3;
 
 void InlineTextBox::destroy()
 {
+    AbstractInlineTextBox::willDestroy(this);
+
     if (!knownToHaveNoOverflow() && gTextBoxesWithOverflow)
         gTextBoxesWithOverflow->remove(this);
     InlineBox::destroy();
 }
 
 void InlineTextBox::markDirty(bool dirty)
 {
     if (dirty) {
         m_len = 0;
         m_start = 0;
@@ skipping 1385 matching lines @@
         return false;
 
     // Offsets at the end are "out" for line breaks (they are on the next line).
     if (isLineBreak())
         return false;
 
     // Offsets at the end are "in" for normal boxes (but the caller has to check affinity).
     return true;
 }
 
+void InlineTextBox::characterWidths(Vector<float>& widths) const
+{
+    FontCachePurgePreventer fontCachePurgePreventer;
+
+    RenderText* textObj = textRenderer();
+    RenderStyle* styleToUse = textObj->style(isFirstLineStyle());
+    const Font& font = styleToUse->font();
+
+    TextRun textRun = constructTextRun(styleToUse, font);
+
+    GlyphBuffer glyphBuffer;
+    WidthIterator it(&font, textRun);
+    float lastWidth = 0;
+    widths.resize(m_len);
+    for (unsigned i = 0; i < m_len; i++) {
+        it.advance(i + 1, &glyphBuffer);

[aboxhall, 2013/10/17 22:27:55]

Could you do the advance() in the for statement, i.e.
for (unsigned i = 0; i < m_len && it.advance(i + 1, &glyphbuffer); i++) ?
Or is that less readable?

[dmazzoni, 2013/10/19 06:48:07]

I find it less readable because the iterator advance doesn't control the loop at
all - it doesn't return success/failure, etc.

+        widths[i] = it.m_runWidthSoFar - lastWidth;
+        lastWidth = it.m_runWidthSoFar;
+    }
+}
+
 TextRun InlineTextBox::constructTextRun(RenderStyle* style, const Font& font, StringBuilder* charactersWithHyphen) const
 {
     ASSERT(style);
 
     RenderText* textRenderer = this->textRenderer();
     ASSERT(textRenderer);
     ASSERT(textRenderer->text());
 
     StringView string = textRenderer->text().createView();
     unsigned startPos = start();
@@ skipping 59 matching lines @@
     printedCharacters = fprintf(stderr, "\t%s %p", obj->renderName(), obj);
     const int rendererCharacterOffset = 24;
     for (; printedCharacters < rendererCharacterOffset; printedCharacters++)
         fputc(' ', stderr);
     fprintf(stderr, "(%d,%d) \"%s\"\n", start(), start() + len(), value.utf8().data());
 }
 
 #endif
 
 } // namespace WebCore