Draw text via Skia in RenderTextLinux.

ui/gfx/render_text.h

 // Copyright (c) 2011 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.
 
 #ifndef UI_GFX_RENDER_TEXT_H_
 #define UI_GFX_RENDER_TEXT_H_
 #pragma once
 
 #include <algorithm>
 #include <vector>
 
 #include "base/gtest_prod_util.h"
 #include "base/i18n/rtl.h"
 #include "base/string16.h"
+#include "third_party/skia/include/core/SkCanvas.h"

[msw, 2011/12/06 18:40:56]

Can you forward declare SkCanvas instead?

[Alexei Svitkine (slow), 2011/12/06 19:10:12]

Done.

 #include "third_party/skia/include/core/SkColor.h"
+#include "third_party/skia/include/core/SkPoint.h"

[msw, 2011/12/06 18:40:56]

Can you forward declare SkPoint instead?

[Alexei Svitkine (slow), 2011/12/06 19:10:12]

Done.

 #include "ui/base/range/range.h"
 #include "ui/gfx/font.h"
 #include "ui/gfx/point.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/selection_model.h"
 
 namespace gfx {
 
+class Canvas;
+class RenderTextTest;
+
+namespace internal {
+
+// Internal helper class used by derived classes to draw text through Skia.
+class SkiaTextRenderer {

[msw, 2011/12/06 18:40:56]

Does this belong in its own file? That might help split rendering from
layout/shaping/metrics.

[Alexei Svitkine (slow), 2011/12/06 19:10:12]

At the moment its not really a very general class - merely something that
facilitates drawing by RenderText subclasses. This is why I didn't want to make
it top level - it's not really meant for other classes.

Although I was thinking it might make sense to have a |render_text| directory
under ui/gfx to hold the different RenderText* classes. If that were the case,
I'd be more inclined to have this in its own file, in that directory - so that
it's still clear that it's not for general consumption.

[msw, 2011/12/07 01:08:45]

Fair enough, this is fine for now.
A snazzy subdir for this code might eventually be warranted.

+ public:
+  explicit SkiaTextRenderer(Canvas* canvas);
+  ~SkiaTextRenderer();
+
+  void Init();
+  void SetFont(const gfx::Font& font);
+  void SetForegroundColor(SkColor foreground);
+  void DrawSelection(const std::vector<Rect>& selection, SkColor color);
+  void DrawPosText(const SkPoint* pos,
+                   const uint16* glyphs,
+                   size_t glyph_count);
+  void DrawDecorations(int x, int y, int width, bool underline, bool strike);
+  void DrawCursor(const gfx::Rect& bounds);
+
+ private:
+  SkCanvas* canvas_skia_;
+  SkPaint paint_;
+
+  DISALLOW_COPY_AND_ASSIGN(SkiaTextRenderer);
+};
+
+}  // namespace internal
+
 // Color settings for text, backgrounds and cursor.
 // These are tentative, and should be derived from theme, system
 // settings and current settings.
 // TODO(oshima): Change this to match the standard chrome
 // before dogfooding textfield views.
 const SkColor kSelectedTextColor = SK_ColorWHITE;
 const SkColor kFocusedSelectionColor = SkColorSetRGB(30, 144, 255);
 const SkColor kUnfocusedSelectionColor = SK_ColorLTGRAY;
 const SkColor kCursorColor = SK_ColorBLACK;
 
-class Canvas;
-class RenderTextTest;
-
 // A visual style applicable to a range of text.
 struct UI_EXPORT StyleRange {
   StyleRange();
 
   Font font;
   SkColor foreground;
   bool strike;
   bool underline;
   ui::Range range;
 };
@@ skipping 266 matching lines @@
   // The cached bounds and offset are invalidated by changes to the cursor,
   // selection, font, and other operations that adjust the visible text bounds.
   bool cached_bounds_and_offset_valid_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderText);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_RENDER_TEXT_H_