Move InlineTextBox::paint guts into blink::TextPainter.

Source/core/rendering/TextPainter.cpp

Index: Source/core/rendering/TextPainter.cpp
diff --git a/Source/core/rendering/TextPainter.cpp b/Source/core/rendering/TextPainter.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..724bfd40e08cfb73a176ae714b49bde12b390877
--- /dev/null
+++ b/Source/core/rendering/TextPainter.cpp
@@ -0,0 +1,138 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "config.h"
+#include "core/rendering/TextPainter.h"
+
+#include "core/rendering/InlineTextBox.h"
+#include "core/rendering/RenderCombineText.h"
+#include "core/rendering/style/ShadowList.h"
+#include "platform/fonts/Font.h"
+#include "platform/graphics/GraphicsContext.h"
+#include "platform/graphics/GraphicsContextStateSaver.h"
+#include "platform/text/TextRun.h"
+#include "wtf/Assertions.h"
+#include "wtf/unicode/CharacterNames.h"
+
+namespace blink {
+
+TextPainter::TextPainter(GraphicsContext* context, const Font& font, const TextRun& run, const FloatPoint& textOrigin, const FloatRect& textBounds, bool horizontal)
+    : m_graphicsContext(context)
+    , m_font(font)
+    , m_run(run)
+    , m_textOrigin(textOrigin)
+    , m_textBounds(textBounds)
+    , m_horizontal(horizontal)
+    , m_emphasisMarkOffset(0)
+    , m_combinedText(0)
+{
+}
+
+TextPainter::~TextPainter()
+{
+}
+
+void TextPainter::setEmphasisMark(const AtomicString& emphasisMark, TextEmphasisPosition position)
+{
+    m_emphasisMark = emphasisMark;
+
+    if (emphasisMark.isNull()) {
+        m_emphasisMarkOffset = 0;
+    } else if (position == TextEmphasisPositionOver) {
+        m_emphasisMarkOffset = -m_font.fontMetrics().ascent() - m_font.emphasisMarkDescent(emphasisMark);
+    } else {
+        ASSERT(position == TextEmphasisPositionUnder);
+        m_emphasisMarkOffset = m_font.fontMetrics().descent() + m_font.emphasisMarkAscent(emphasisMark);
+    }
+}
+
+void TextPainter::paint(int startOffset, int endOffset, int length, const Style& textStyle)
+{
+    GraphicsContextStateSaver stateSaver(*m_graphicsContext, false);
+    updateGraphicsContext(textStyle, stateSaver);
+    paintInternal<PaintText>(startOffset, endOffset, length);
+
+    if (!m_emphasisMark.isEmpty()) {
+        if (textStyle.emphasisMarkColor != textStyle.fillColor)
+            m_graphicsContext->setFillColor(textStyle.emphasisMarkColor);
+
+        if (m_combinedText)
+            paintEmphasisMarkForCombinedText();
+        else
+            paintInternal<PaintEmphasisMark>(startOffset, endOffset, length);
+    }
+}
+
+// static
+void TextPainter::updateGraphicsContext(GraphicsContext* context, const Style& textStyle, bool horizontal, GraphicsContextStateSaver& stateSaver)
+{
+    TextDrawingModeFlags mode = context->textDrawingMode();
+    if (textStyle.strokeWidth > 0) {
+        TextDrawingModeFlags newMode = mode | TextModeStroke;
+        if (mode != newMode) {
+            if (!stateSaver.saved())
+                stateSaver.save();
+            context->setTextDrawingMode(newMode);
+            mode = newMode;
+        }
+    }
+
+    if (mode & TextModeFill && textStyle.fillColor != context->fillColor())
+        context->setFillColor(textStyle.fillColor);
+
+    if (mode & TextModeStroke) {
+        if (textStyle.strokeColor != context->strokeColor())
+            context->setStrokeColor(textStyle.strokeColor);
+        if (textStyle.strokeWidth != context->strokeThickness())
+            context->setStrokeThickness(textStyle.strokeWidth);
+    }
+
+    // Text shadows are disabled when printing. http://crbug.com/258321
+    if (textStyle.shadow && !context->printing()) {
+        if (!stateSaver.saved())
+            stateSaver.save();
+        context->setDrawLooper(textStyle.shadow->createDrawLooper(DrawLooperBuilder::ShadowIgnoresAlpha, horizontal));
+    }
+}
+
+template <TextPainter::PaintInternalStep step>
+void TextPainter::paintInternalRun(TextRunPaintInfo& textRunPaintInfo, int from, int to)
+{
+    textRunPaintInfo.from = from;
+    textRunPaintInfo.to = to;
+    if (step == PaintEmphasisMark)
+        m_graphicsContext->drawEmphasisMarks(m_font, textRunPaintInfo, m_emphasisMark, m_textOrigin + IntSize(0, m_emphasisMarkOffset));
+    else
+        m_graphicsContext->drawText(m_font, textRunPaintInfo, m_textOrigin);
+
+}
+
+template <TextPainter::PaintInternalStep Step>
+void TextPainter::paintInternal(int startOffset, int endOffset, int truncationPoint)
+{
+    TextRunPaintInfo textRunPaintInfo(m_run);
+    textRunPaintInfo.bounds = m_textBounds;
+    if (startOffset <= endOffset) {
+        paintInternalRun<Step>(textRunPaintInfo, startOffset, endOffset);
+    } else {
+        if (endOffset > 0)
+            paintInternalRun<Step>(textRunPaintInfo, 0, endOffset);
+        if (startOffset < truncationPoint)
+            paintInternalRun<Step>(textRunPaintInfo, startOffset, truncationPoint);
+    }
+}
+
+void TextPainter::paintEmphasisMarkForCombinedText()
+{
+    ASSERT(m_combinedText);
+    DEFINE_STATIC_LOCAL(TextRun, objectReplacementCharacterTextRun, (&objectReplacementCharacter, 1));
+    FloatPoint emphasisMarkTextOrigin(m_textBounds.x() + m_textBounds.width() / 2, m_textBounds.y() + m_font.fontMetrics().ascent() + m_emphasisMarkOffset);
+    TextRunPaintInfo textRunPaintInfo(objectReplacementCharacterTextRun);
+    textRunPaintInfo.bounds = m_textBounds;
+    m_graphicsContext->concatCTM(InlineTextBox::rotation(m_textBounds, InlineTextBox::Clockwise));
+    m_graphicsContext->drawEmphasisMarks(m_combinedText->originalFont(), textRunPaintInfo, m_emphasisMark, emphasisMarkTextOrigin);
+    m_graphicsContext->concatCTM(InlineTextBox::rotation(m_textBounds, InlineTextBox::Counterclockwise));
+}
+
+} // namespace blink