ash: Better and faster text shadows.

- Add a DrawStringWithShadows that draws text with shadows to canvas skia
  and RenderText;
- Use DrawStringWithShadows in DropShadowLabel for better and faster text
  shadows;

BUG=121694
TEST=Verify fix for issue 121694.


Review URL: http://codereview.chromium.org/10008027

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@131696 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 13 insertions, 0 deletions

diff --git a/ui/gfx/render_text.h b/ui/gfx/render_text.h
index 1e32489..8077828 100644
--- a/ui/gfx/render_text.h
+++ b/ui/gfx/render_text.h
@@ -28,6 +28,7 @@ namespace gfx {
 
 class Canvas;
 class RenderTextTest;
+class ShadowValue;
 struct StyleRange;
 
 namespace internal {
@@ -38,6 +39,7 @@ class SkiaTextRenderer {
   explicit SkiaTextRenderer(Canvas* canvas);
   ~SkiaTextRenderer();
 
+  void SetDrawLooper(SkDrawLooper* draw_looper);
   void SetFontSmoothingSettings(bool enable_smoothing, bool enable_lcd_text);
   void SetTypeface(SkTypeface* typeface);
   void SetTextSize(int size);
@@ -214,6 +216,8 @@ class UI_EXPORT RenderText {
 
   // Get the size in pixels of the entire string. For the height, this will
   // return the maximum height among the different fonts in the text runs.
+  // Note that this returns the raw size of the string, which does not include
+  // the margin area of text shadows.
   virtual Size GetStringSize() = 0;
 
   void Draw(Canvas* canvas);
@@ -246,6 +250,9 @@ class UI_EXPORT RenderText {
   // The returned value represents a cursor/caret position without a selection.
   SelectionModel GetSelectionModelForSelectionStart();
 
+  // Sets shadows to drawn with text.
+  void SetTextShadows(const std::vector<ShadowValue>& shadows);
+
  protected:
   RenderText();
 
@@ -339,6 +346,9 @@ class UI_EXPORT RenderText {
   // Applies fade effects to |renderer|.
   void ApplyFadeEffects(internal::SkiaTextRenderer* renderer);
 
+  // Applies text shadows to |renderer|.
+  void ApplyTextShadows(internal::SkiaTextRenderer* renderer);
+
   // A convenience function to check whether the glyph attached to the caret
   // is within the given range.
   static bool RangeContainsCaret(const ui::Range& range,
@@ -430,6 +440,9 @@ class UI_EXPORT RenderText {
   // selection, font, and other operations that adjust the visible text bounds.
   bool cached_bounds_and_offset_valid_;
 
+  // Text shadows to be drawn.
+  std::vector<ShadowValue> text_shadows_;
+
   DISALLOW_COPY_AND_ASSIGN(RenderText);
 };