Disable rounding hacks.

Bug:3085564
Change-Id: Ie570cbac6a445a337c72466598d5550c84d803ad

4 files changed, 82 insertions, 0 deletions

diff --git a/WebCore/config.h b/WebCore/config.h
index 098e3f0..7eaeaef 100644
--- a/WebCore/config.h
+++ b/WebCore/config.h
@@ -148,6 +148,8 @@
 
 #define ANDROID_FIX
 
+#define ANDROID_DISABLE_ROUNDING_HACKS
+
 // Ensure that the fixed elements are always relative to the top document.
 #define ANDROID_FIXED_ELEMENTS
 
diff --git a/WebCore/rendering/InlineTextBox.cpp b/WebCore/rendering/InlineTextBox.cpp
index 575bdf2..2bec8a1 100644
--- a/WebCore/rendering/InlineTextBox.cpp
+++ b/WebCore/rendering/InlineTextBox.cpp
@@ -158,8 +158,15 @@ IntRect InlineTextBox::selectionRect(int tx, int ty, int startPos, int endPos)
         ePos = len;
     }
 
+#ifdef ANDROID_DISABLE_ROUNDING_HACKS
+    TextRun textRun = TextRun(characters, len, textObj->allowTabs(), textPos(), m_toAdd, !isLeftToRightDirection(), m_dirOverride);
+    if (m_disableRoundingHacks)
+        textRun.disableRoundingHacks();
+    IntRect r = enclosingIntRect(f.selectionRectForText(textRun, IntPoint(), selHeight, sPos, ePos));
+#else
     IntRect r = enclosingIntRect(f.selectionRectForText(TextRun(characters, len, textObj->allowTabs(), textPos(), m_toAdd, !isLeftToRightDirection(), m_dirOverride),
                                                         IntPoint(), selHeight, sPos, ePos));
+#endif
                                                         
     int logicalWidth = r.width();
     if (r.x() > m_logicalWidth)
@@ -555,6 +562,10 @@ void InlineTextBox::paint(PaintInfo& paintInfo, int tx, int ty)
         adjustCharactersAndLengthForHyphen(charactersWithHyphen, styleToUse, characters, length);
 
     TextRun textRun(characters, length, textRenderer()->allowTabs(), textPos(), m_toAdd, !isLeftToRightDirection(), m_dirOverride || styleToUse->visuallyOrdered());
+#ifdef ANDROID_DISABLE_ROUNDING_HACKS
+    if (m_disableRoundingHacks)
+        textRun.disableRoundingHacks();
+#endif
 
     int sPos = 0;
     int ePos = 0;
@@ -689,9 +700,17 @@ void InlineTextBox::paintSelection(GraphicsContext* context, const IntPoint& box
     int selHeight = selectionHeight();
     IntPoint localOrigin(boxOrigin.x(), boxOrigin.y() - deltaY);
     context->clip(IntRect(localOrigin, IntSize(m_logicalWidth, selHeight)));
+#ifdef ANDROID_DISABLE_ROUNDING_HACKS
+    TextRun textRun = TextRun(characters, length, textRenderer()->allowTabs(), textPos(), m_toAdd,
+                              !isLeftToRightDirection(), m_dirOverride || style->visuallyOrdered());
+    if (m_disableRoundingHacks)
+        textRun.disableRoundingHacks();
+    context->drawHighlightForText(font, textRun, localOrigin, selHeight, c, style->colorSpace(), sPos, ePos);
+#else
     context->drawHighlightForText(font, TextRun(characters, length, textRenderer()->allowTabs(), textPos(), m_toAdd, 
                                   !isLeftToRightDirection(), m_dirOverride || style->visuallyOrdered()),
                                   localOrigin, selHeight, c, style->colorSpace(), sPos, ePos);
+#endif
     context->restore();
 }
 
@@ -713,9 +732,17 @@ void InlineTextBox::paintCompositionBackground(GraphicsContext* context, const I
     int deltaY = renderer()->style()->isFlippedLinesWritingMode() ? selectionBottom() - logicalBottom() : logicalTop() - selectionTop();
     int selHeight = selectionHeight();
     IntPoint localOrigin(boxOrigin.x(), boxOrigin.y() - deltaY);
+#ifdef ANDROID_DISABLE_ROUNDING_HACKS
+    TextRun textRun = TextRun(textRenderer()->text()->characters() + m_start, m_len, textRenderer()->allowTabs(), textPos(), m_toAdd,
+                              !isLeftToRightDirection(), m_dirOverride || style->visuallyOrdered());
+    if (m_disableRoundingHacks)
+        textRun.disableRoundingHacks();
+    context->drawHighlightForText(font, textRun, localOrigin, selHeight, c, style->colorSpace(), sPos, ePos);
+#else
     context->drawHighlightForText(font, TextRun(textRenderer()->text()->characters() + m_start, m_len, textRenderer()->allowTabs(), textPos(), m_toAdd,
                                   !isLeftToRightDirection(), m_dirOverride || style->visuallyOrdered()),
                                   localOrigin, selHeight, c, style->colorSpace(), sPos, ePos);
+#endif
     context->restore();
 }
 
@@ -876,6 +903,10 @@ void InlineTextBox::paintSpellingOrGrammarMarker(GraphicsContext* pt, const IntP
         int selHeight = selectionHeight();
         IntPoint startPoint(boxOrigin.x(), boxOrigin.y() - deltaY);
         TextRun run(textRenderer()->text()->characters() + m_start, m_len, textRenderer()->allowTabs(), textPos(), m_toAdd, !isLeftToRightDirection(), m_dirOverride || style->visuallyOrdered());
+#ifdef ANDROID_DISABLE_ROUNDING_HACKS
+    if (m_disableRoundingHacks)
+        run.disableRoundingHacks();
+#endif
          
         IntRect markerRect = enclosingIntRect(font.selectionRectForText(run, startPoint, selHeight, startPosition, endPosition));
         start = markerRect.x() - startPoint.x();
@@ -920,6 +951,10 @@ void InlineTextBox::paintTextMatchMarker(GraphicsContext* pt, const IntPoint& bo
     int sPos = max(marker.startOffset - m_start, (unsigned)0);
     int ePos = min(marker.endOffset - m_start, (unsigned)m_len);    
     TextRun run(textRenderer()->text()->characters() + m_start, m_len, textRenderer()->allowTabs(), textPos(), m_toAdd, !isLeftToRightDirection(), m_dirOverride || style->visuallyOrdered());
+#ifdef ANDROID_DISABLE_ROUNDING_HACKS
+    if (m_disableRoundingHacks)
+        run.disableRoundingHacks();
+#endif
     
     // Always compute and store the rect associated with this marker. The computed rect is in absolute coordinates.
     IntRect markerRect = enclosingIntRect(font.selectionRectForText(run, IntPoint(m_x, selectionTop()), selHeight, sPos, ePos));
@@ -948,6 +983,10 @@ void InlineTextBox::computeRectForReplacementMarker(const DocumentMarker& marker
     int sPos = max(marker.startOffset - m_start, (unsigned)0);
     int ePos = min(marker.endOffset - m_start, (unsigned)m_len);    
     TextRun run(textRenderer()->text()->characters() + m_start, m_len, textRenderer()->allowTabs(), textPos(), m_toAdd, !isLeftToRightDirection(), m_dirOverride || style->visuallyOrdered());
+#ifdef ANDROID_DISABLE_ROUNDING_HACKS
+    if (m_disableRoundingHacks)
+        run.disableRoundingHacks();
+#endif
     IntPoint startPoint = IntPoint(m_x, y);
     
     // Compute and store the rect associated with this marker.
@@ -1099,8 +1138,15 @@ int InlineTextBox::offsetForPosition(int lineOffset, bool includePartialGlyphs)
     RenderText* text = toRenderText(renderer());
     RenderStyle* style = text->style(m_firstLine);
     const Font* f = &style->font();
+#ifdef ANDROID_DISABLE_ROUNDING_HACKS
+    TextRun textRun = TextRun(textRenderer()->text()->characters() + m_start, m_len, textRenderer()->allowTabs(), textPos(), m_toAdd, !isLeftToRightDirection(), m_dirOverride || style->visuallyOrdered());
+    if (m_disableRoundingHacks)
+        textRun.disableRoundingHacks();
+    return f->offsetForPosition(textRun, lineOffset - logicalLeft(), includePartialGlyphs);
+#else
     return f->offsetForPosition(TextRun(textRenderer()->text()->characters() + m_start, m_len, textRenderer()->allowTabs(), textPos(), m_toAdd, !isLeftToRightDirection(), m_dirOverride || style->visuallyOrdered()),
                                 lineOffset - logicalLeft(), includePartialGlyphs);
+#endif
 }
 
 int InlineTextBox::positionForOffset(int offset) const
@@ -1116,8 +1162,15 @@ int InlineTextBox::positionForOffset(int offset) const
     int from = !isLeftToRightDirection() ? offset - m_start : 0;
     int to = !isLeftToRightDirection() ? m_len : offset - m_start;
     // FIXME: Do we need to add rightBearing here?
+#ifdef ANDROID_DISABLE_ROUNDING_HACKS
+    TextRun textRun = TextRun(text->text()->characters() + m_start, m_len, textRenderer()->allowTabs(), textPos(), m_toAdd, !isLeftToRightDirection(), m_dirOverride);
+    if (m_disableRoundingHacks)
+        textRun.disableRoundingHacks();
+    return enclosingIntRect(f.selectionRectForText(textRun, IntPoint(logicalLeft(), 0), 0, from, to)).right();
+#else
     return enclosingIntRect(f.selectionRectForText(TextRun(text->text()->characters() + m_start, m_len, textRenderer()->allowTabs(), textPos(), m_toAdd, !isLeftToRightDirection(), m_dirOverride),
                                                    IntPoint(logicalLeft(), 0), 0, from, to)).right();
+#endif
 }
 
 bool InlineTextBox::containsCaretOffset(int offset) const
diff --git a/WebCore/rendering/InlineTextBox.h b/WebCore/rendering/InlineTextBox.h
index bc2219b..e19da2e 100644
--- a/WebCore/rendering/InlineTextBox.h
+++ b/WebCore/rendering/InlineTextBox.h
@@ -39,13 +39,20 @@ Color correctedTextColor(Color textColor, Color backgroundColor);
 
 class InlineTextBox : public InlineBox {
 public:
+#ifdef ANDROID_DISABLE_ROUNDING_HACKS
+    InlineTextBox(RenderObject* obj, bool disableRoundingHacks = false)
+#else
     InlineTextBox(RenderObject* obj)
+#endif
         : InlineBox(obj)
         , m_prevTextBox(0)
         , m_nextTextBox(0)
         , m_start(0)
         , m_len(0)
         , m_truncation(cNoTruncation)
+#ifdef ANDROID_DISABLE_ROUNDING_HACKS
+        , m_disableRoundingHacks(disableRoundingHacks)
+#endif
     {
     }
 
@@ -139,6 +146,9 @@ private:
 
     unsigned short m_truncation; // Where to truncate when text overflow is applied.  We use special constants to
                       // denote no truncation (the whole run paints) and full truncation (nothing paints at all).
+#ifdef ANDROID_DISABLE_ROUNDING_HACKS
+    bool m_disableRoundingHacks;
+#endif
 
 protected:
     void paintCompositionBackground(GraphicsContext*, const IntPoint& boxOrigin, RenderStyle*, const Font&, int startPos, int endPos);
diff --git a/WebCore/rendering/RenderText.cpp b/WebCore/rendering/RenderText.cpp
index 7635d07..b1e9413 100644
--- a/WebCore/rendering/RenderText.cpp
+++ b/WebCore/rendering/RenderText.cpp
@@ -1158,10 +1158,27 @@ void RenderText::dirtyLineBoxes(bool fullLayout)
     }
     m_linesDirty = false;
 }
+#ifdef ANDROID_DISABLE_ROUNDING_HACKS
+static bool disableRoundingHacks(RenderText* renderText)
+{
+    RenderObject* renderer = renderText;
+    while (renderer) {
+        if (renderer->isTextControl()) {
+            return true;
+        }
+        renderer = renderer->parent();
+    }
+    return false;
+}
+#endif
 
 InlineTextBox* RenderText::createTextBox()
 {
+#ifdef ANDROID_DISABLE_ROUNDING_HACKS
+    return new (renderArena()) InlineTextBox(this, disableRoundingHacks(this));
+#else
     return new (renderArena()) InlineTextBox(this);
+#endif
 }
 
 InlineTextBox* RenderText::createInlineTextBox()