Canvas refactoring part 2....

gfx/canvas.h

-// 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 GFX_CANVAS_H_
-#define GFX_CANVAS_H_
-
-#include "base/basictypes.h"
-#include "gfx/canvas_2.h"
-#include "skia/ext/platform_canvas.h"
-
-#if defined(OS_POSIX) && !defined(OS_MACOSX)
-typedef struct _GdkPixbuf GdkPixbuf;
-#endif
-
-namespace gfx {
-
-// Canvas 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 Canvas : public skia::PlatformCanvas,
-               public Canvas2 {
- public:
-  // Creates an empty Canvas. Callers must use initialize before using the
-  // canvas.
-  Canvas();
-
-  Canvas(int width, int height, bool is_opaque);
-
-  virtual ~Canvas();
-
-  // 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 std::wstring& 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::Canvas 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
-
-#ifdef OS_WIN  // Only implemented on Windows for now.
-  // Draws text with a 1-pixel halo around it of the given color. 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.
-  void DrawStringWithHalo(const std::wstring& text,
-                          const gfx::Font& font,
-                          const SkColor& text_color,
-                          const SkColor& halo_color,
-                          int x, int y, int w, int h, int flags);
-#endif
-
-  // Overridden from Canvas2:
-  virtual bool GetClipRect(gfx::Rect* clip_rect);
-  virtual bool ClipRectInt(int x, int y, int w, int h);
-  virtual bool IntersectsClipRectInt(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(int x, int y, int w, int h,
-                           const SkPaint& paint);
-  virtual void FillRectInt(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);
-  virtual void DrawRectInt(const SkColor& color, int x, int y, int w, int h,
-                           SkXfermode::Mode mode);
-  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 std::wstring& text, const gfx::Font& font,
-                             const SkColor& color, int x, int y, int w,
-                             int h);
-  virtual void DrawStringInt(const std::wstring& text, const gfx::Font& font,
-                             const SkColor& color,
-                             const gfx::Rect& display_rect);
-  virtual void DrawStringInt(const std::wstring& 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 SkBitmap ExtractBitmap() const;
-  virtual Canvas* AsCanvas();
-
- private:
-#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 std::wstring& text, HFONT font,
-                     const SkColor& color, int x, int y, int w, int h,
-                     int flags);
-#endif
-
-  DISALLOW_COPY_AND_ASSIGN(Canvas);
-};
-
-}  // namespace gfx;
-
-#endif  // GFX_CANVAS_H_