[LayoutNG] Paint inlines from the fragment tree

third_party/WebKit/Source/core/paint/NGTextPainter.cpp

+// Copyright 2017 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 "core/paint/NGTextPainter.h"
+
+#include "core/CSSPropertyNames.h"
+#include "core/frame/Settings.h"
+#include "core/layout/ng/inline/ng_physical_text_fragment.h"
+#include "core/paint/BoxPainter.h"
+#include "core/paint/PaintInfo.h"
+#include "core/style/ComputedStyle.h"
+#include "core/style/ShadowList.h"
+#include "platform/fonts/Font.h"
+#include "platform/graphics/GraphicsContext.h"
+#include "platform/graphics/GraphicsContextStateSaver.h"
+#include "platform/wtf/Assertions.h"
+#include "platform/wtf/text/CharacterNames.h"
+
+namespace blink {
+
+void NGTextPainter::Paint(unsigned start_offset,
+                          unsigned end_offset,
+                          unsigned length,
+                          const Style& text_style) {
+  GraphicsContextStateSaver state_saver(graphics_context_, false);
+  UpdateGraphicsContext(text_style, state_saver);
+  // if (combined_text_) {
+  //  graphics_context_.Save();
+  //  combined_text_->TransformToInlineCoordinates(graphics_context_,
+  //                                               text_bounds_);
+  //  PaintInternal<kPaintText>(start_offset, end_offset, length);
+  //  graphics_context_.Restore();
+  //} else {
+  PaintInternal<kPaintText>(start_offset, end_offset, length);
+  //}
+
+  // if (!emphasis_mark_.IsEmpty()) {
+  //  if (text_style.emphasis_mark_color != text_style.fill_color)
+  //    graphics_context_.SetFillColor(text_style.emphasis_mark_color);
+  //
+  //  if (combined_text_)
+  //    PaintEmphasisMarkForCombinedText();
+  //  else
+  //    PaintInternal<kPaintEmphasisMark>(start_offset, end_offset, length);
+  //}
+}
+
+template <NGTextPainter::PaintInternalStep step>
+void NGTextPainter::PaintInternalFragment(
+    TextFragmentPaintInfo& fragment_paint_info,
+    unsigned from,
+    unsigned to) {
+  DCHECK(from <= fragment_paint_info.text.length());

[yosin_UTC9, 2017/05/22 09:14:15]

nit: s/DCHECK/DCHECK_LE/

+  DCHECK(to <= fragment_paint_info.text.length());

[yosin_UTC9, 2017/05/22 09:14:15]

nit: s/DCHECK/DCHECK_LE/

It is better to write

DCHECK_LE(to, fragment_paint_info.text.length());
DCHECK_LE(from, to);

+
+  fragment_paint_info.from = from;
+  fragment_paint_info.to = to;
+
+  if (step == kPaintEmphasisMark) {
+    graphics_context_.DrawEmphasisMarks(
+        font_, fragment_paint_info, emphasis_mark_,
+        FloatPoint(text_origin_) + IntSize(0, emphasis_mark_offset_));
+  } else {
+    DCHECK(step == kPaintText);

[yosin_UTC9, 2017/05/22 09:14:15]

nit: s/DCHECK/DCHECK_EQ/

+    graphics_context_.DrawText(font_, fragment_paint_info,
+                               FloatPoint(text_origin_));
+  }
+}
+
+template <NGTextPainter::PaintInternalStep Step>
+void NGTextPainter::PaintInternal(unsigned start_offset,
+                                  unsigned end_offset,
+                                  unsigned truncation_point) {
+  unsigned offset = 0;
+  TextFragmentPaintInfo fragment_paint_info = {
+      text_fragment_->Text(), TextDirection::kLtr, offset,
+      text_fragment_->Text().length(), text_fragment_->TextShapeResult()};
+
+  // fragment_paint_info.bounds = FloatRect(text_bounds_);
+  if (start_offset <= end_offset) {
+    PaintInternalFragment<Step>(fragment_paint_info, start_offset, end_offset);
+  } else {
+    if (end_offset > 0) {
+      PaintInternalFragment<Step>(fragment_paint_info, ellipsis_offset_,
+                                  end_offset);
+    }
+    if (start_offset < truncation_point) {
+      PaintInternalFragment<Step>(fragment_paint_info, start_offset,
+                                  truncation_point);
+    }
+  }
+}
+
+void NGTextPainter::ClipDecorationsStripe(float upper,
+                                          float stripe_width,
+                                          float dilation) {}
+
+void NGTextPainter::PaintEmphasisMarkForCombinedText() {}
+
+}  // namespace blink