1 files changed, 165 insertions, 0 deletions
diff --git a/ui/gfx/canvas_skia.h b/ui/gfx/canvas_skia.h
new file mode 100644
index 0000000..ce16fae
--- /dev/null
+++ b/ui/gfx/canvas_skia.h
@@ -0,0 +1,165 @@
+// Copyright (c) 2010 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_CANVAS_SKIA_H_
+#define UI_GFX_CANVAS_SKIA_H_
+#pragma once
+
+#include "base/basictypes.h"
+#include "base/string16.h"
+#include "gfx/canvas.h"
+#include "skia/ext/platform_canvas.h"
+
+#if defined(OS_POSIX) && !defined(OS_MACOSX)
+typedef struct _GdkPixbuf GdkPixbuf;
+#endif
+
+namespace gfx {
+
+class Canvas;
+
+// CanvasSkia is a SkCanvas subclass that provides a number of methods for
+// common operations used throughout an application built using base/gfx and
+// app/gfx.
+//
+// All methods that take integer arguments (as is used throughout views)
+// end with Int. If you need to use methods provided by the superclass
+// you'll need to do a conversion. In particular you'll need to use
+// macro SkIntToScalar(xxx), or if converting from a scalar to an integer
+// SkScalarRound.
+//
+// A handful of methods in this class are overloaded providing an additional
+// argument of type SkXfermode::Mode. SkXfermode::Mode specifies how the
+// source and destination colors are combined. Unless otherwise specified,
+// the variant that does not take a SkXfermode::Mode uses a transfer mode
+// of kSrcOver_Mode.
+class CanvasSkia : public skia::PlatformCanvas,
+                   public Canvas {
+ public:
+  // Creates an empty Canvas. Callers must use initialize before using the
+  // canvas.
+  CanvasSkia();
+
+  CanvasSkia(int width, int height, bool is_opaque);
+
+  virtual ~CanvasSkia();
+
+  // Compute the size required to draw some text with the provided font.
+  // Attempts to fit the text with the provided width and height. Increases
+  // height and then width as needed to make the text fit. This method
+  // supports multiple lines.
+  static void SizeStringInt(const string16& text,
+                            const gfx::Font& font,
+                            int* width, int* height,
+                            int flags);
+
+  // Returns the default text alignment to be used when drawing text on a
+  // gfx::CanvasSkia based on the directionality of the system locale language.
+  // This function is used by gfx::Canvas::DrawStringInt when the text alignment
+  // is not specified.
+  //
+  // This function returns either gfx::Canvas::TEXT_ALIGN_LEFT or
+  // gfx::Canvas::TEXT_ALIGN_RIGHT.
+  static int DefaultCanvasTextAlignment();
+
+#if defined(OS_POSIX) && !defined(OS_MACOSX)
+  // Draw the pixbuf in its natural size at (x, y).
+  void DrawGdkPixbuf(GdkPixbuf* pixbuf, int x, int y);
+#endif
+
+#if defined(OS_WIN) || (defined(OS_POSIX) && !defined(OS_MACOSX))
+  // Draws text with a 1-pixel halo around it of the given color.
+  // On Windows, it allows ClearType to be drawn to an otherwise transparenct
+  //   bitmap for drag images. Drag images have only 1-bit of transparency, so
+  //   we don't do any fancy blurring.
+  // On Linux, text with halo is created by stroking it with 2px |halo_color|
+  //   then filling it with |text_color|.
+  void DrawStringWithHalo(const string16& text,
+                          const gfx::Font& font,
+                          const SkColor& text_color,
+                          const SkColor& halo_color,
+                          int x, int y, int w, int h,
+                          int flags);
+#endif
+
+  // Extracts a bitmap from the contents of this canvas.
+  SkBitmap ExtractBitmap() const;
+
+  // Overridden from Canvas:
+  virtual void Save();
+  virtual void SaveLayerAlpha(uint8 alpha);
+  virtual void SaveLayerAlpha(uint8 alpha, const gfx::Rect& layer_bounds);
+  virtual void Restore();
+  virtual bool ClipRectInt(int x, int y, int w, int h);
+  virtual void TranslateInt(int x, int y);
+  virtual void ScaleInt(int x, int y);
+  virtual void FillRectInt(const SkColor& color, int x, int y, int w, int h);
+  virtual void FillRectInt(const SkColor& color, int x, int y, int w, int h,
+                           SkXfermode::Mode mode);
+  virtual void FillRectInt(const gfx::Brush* brush, int x, int y, int w, int h);
+  virtual void DrawRectInt(const SkColor& color, int x, int y, int w, int h);
+  virtual void DrawRectInt(const SkColor& color,
+                           int x, int y, int w, int h,
+                           SkXfermode::Mode mode);
+  virtual void DrawRectInt(int x, int y, int w, int h, const SkPaint& paint);
+  virtual void DrawLineInt(const SkColor& color,
+                           int x1, int y1,
+                           int x2, int y2);
+  virtual void DrawBitmapInt(const SkBitmap& bitmap, int x, int y);
+  virtual void DrawBitmapInt(const SkBitmap& bitmap,
+                             int x, int y,
+                             const SkPaint& paint);
+  virtual void DrawBitmapInt(const SkBitmap& bitmap,
+                             int src_x, int src_y, int src_w, int src_h,
+                             int dest_x, int dest_y, int dest_w, int dest_h,
+                             bool filter);
+  virtual void DrawBitmapInt(const SkBitmap& bitmap,
+                             int src_x, int src_y, int src_w, int src_h,
+                             int dest_x, int dest_y, int dest_w, int dest_h,
+                             bool filter,
+                             const SkPaint& paint);
+  virtual void DrawStringInt(const string16& text,
+                             const gfx::Font& font,
+                             const SkColor& color,
+                             int x, int y, int w, int h);
+  virtual void DrawStringInt(const string16& text,
+                             const gfx::Font& font,
+                             const SkColor& color,
+                             const gfx::Rect& display_rect);
+  virtual void DrawStringInt(const string16& text,
+                             const gfx::Font& font,
+                             const SkColor& color,
+                             int x, int y, int w, int h,
+                             int flags);
+  virtual void DrawFocusRect(int x, int y, int width, int height);
+  virtual void TileImageInt(const SkBitmap& bitmap, int x, int y, int w, int h);
+  virtual void TileImageInt(const SkBitmap& bitmap,
+                            int src_x, int src_y,
+                            int dest_x, int dest_y, int w, int h);
+  virtual gfx::NativeDrawingContext BeginPlatformPaint();
+  virtual void EndPlatformPaint();
+  virtual CanvasSkia* AsCanvasSkia();
+  virtual const CanvasSkia* AsCanvasSkia() const;
+
+ private:
+  // Test whether the provided rectangle intersects the current clip rect.
+  bool IntersectsClipRectInt(int x, int y, int w, int h);
+
+#if defined(OS_WIN)
+  // Draws text with the specified color, font and location. The text is
+  // aligned to the left, vertically centered, clipped to the region. If the
+  // text is too big, it is truncated and '...' is added to the end.
+  void DrawStringInt(const string16& text,
+                     HFONT font,
+                     const SkColor& color,
+                     int x, int y, int w, int h,
+                     int flags);
+#endif
+
+  DISALLOW_COPY_AND_ASSIGN(CanvasSkia);
+};
+
+}  // namespace gfx;
+
+#endif  // UI_GFX_CANVAS_SKIA_H_