More old files deletion.

ui/gfx/canvas.h

-// Copyright (c) 2012 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_H_
-#define UI_GFX_CANVAS_H_
-
-#include <vector>
-
-#include "base/basictypes.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/strings/string16.h"
-#include "skia/ext/platform_canvas.h"
-#include "skia/ext/refptr.h"
-#include "ui/gfx/image/image_skia.h"
-#include "ui/gfx/native_widget_types.h"
-#include "ui/gfx/shadow_value.h"
-#include "ui/gfx/text_constants.h"
-
-namespace gfx {
-
-class Rect;
-class FontList;
-class Point;
-class Size;
-class Transform;
-
-// Canvas is a SkCanvas wrapper that provides a number of methods for
-// common operations used throughout an application built using ui/gfx.
-//
-// All methods that take integer arguments (as is used throughout views)
-// end with Int. If you need to use methods provided by SkCanvas, you'll
-// need to do a conversion. In particular you'll need to use |SkIntToScalar()|,
-// 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 GFX_EXPORT Canvas {
- public:
-  // Specifies the alignment for text rendered with the DrawStringRect method.
-  enum {
-    TEXT_ALIGN_LEFT = 1 << 0,
-    TEXT_ALIGN_CENTER = 1 << 1,
-    TEXT_ALIGN_RIGHT = 1 << 2,
-
-    // Specifies the text consists of multiple lines.
-    MULTI_LINE = 1 << 3,
-
-    // By default DrawStringRect does not process the prefix ('&') character
-    // specially. That is, the string "&foo" is rendered as "&foo". When
-    // rendering text from a resource that uses the prefix character for
-    // mnemonics, the prefix should be processed and can be rendered as an
-    // underline (SHOW_PREFIX), or not rendered at all (HIDE_PREFIX).
-    SHOW_PREFIX = 1 << 4,
-    HIDE_PREFIX = 1 << 5,
-
-    // Prevent ellipsizing
-    NO_ELLIPSIS = 1 << 6,
-
-    // Specifies if words can be split by new lines.
-    // This only works with MULTI_LINE.
-    CHARACTER_BREAK = 1 << 7,
-
-    // Instructs DrawStringRect() to render the text using RTL directionality.
-    // In most cases, passing this flag is not necessary because information
-    // about the text directionality is going to be embedded within the string
-    // in the form of special Unicode characters. However, we don't insert
-    // directionality characters into strings if the locale is LTR because some
-    // platforms (for example, an English Windows XP with no RTL fonts
-    // installed) don't support these characters. Thus, this flag should be
-    // used to render text using RTL directionality when the locale is LTR.
-    FORCE_RTL_DIRECTIONALITY = 1 << 8,
-
-    // Similar to FORCE_RTL_DIRECTIONALITY, but left-to-right.
-    // See FORCE_RTL_DIRECTIONALITY for details.
-    FORCE_LTR_DIRECTIONALITY = 1 << 9,
-
-    // Instructs DrawStringRect() to not use subpixel rendering.  This is useful
-    // when rendering text onto a fully- or partially-transparent background
-    // that will later be blended with another image.
-    NO_SUBPIXEL_RENDERING = 1 << 10,
-  };
-
-  // Creates an empty canvas with image_scale of 1x.
-  Canvas();
-
-  // Creates canvas with provided DIP |size| and |image_scale|.
-  // If this canvas is not opaque, it's explicitly cleared to transparent before
-  // being returned.
-  Canvas(const Size& size, float image_scale, bool is_opaque);
-
-  // Constructs a canvas with the size and the image_scale of the provided
-  // |image_rep|, and draws the |image_rep| into it.
-  Canvas(const ImageSkiaRep& image_rep, bool is_opaque);
-
-  virtual ~Canvas();
-
-  // Creates a Canvas backed by an |sk_canvas| with |image_scale_|.
-  // |sk_canvas| is assumed to be already scaled based on |image_scale|
-  // so no additional scaling is applied.
-  static Canvas* CreateCanvasWithoutScaling(SkCanvas* sk_canvas,
-                                            float image_scale);
-
-  // Recreates the backing platform canvas with DIP |size| and |image_scale_|.
-  // If the canvas is not opaque, it is explicitly cleared.
-  // This method is public so that canvas_skia_paint can recreate the platform
-  // canvas after having initialized the canvas.
-  // TODO(pkotwicz): Push the image_scale into skia::PlatformCanvas such that
-  // this method can be private.
-  void RecreateBackingCanvas(const Size& size,
-                             float image_scale,
-                             bool is_opaque);
-
-  // Compute the size required to draw some text with the provided fonts.
-  // 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. On Skia only a line_height can be specified and
-  // specifying a 0 value for it will cause the default height to be used.
-  static void SizeStringInt(const base::string16& text,
-                            const FontList& font_list,
-                            int* width,
-                            int* height,
-                            int line_height,
-                            int flags);
-
-  // This is same as SizeStringInt except that fractional size is returned.
-  // See comment in GetStringWidthF for its usage.
-  static void SizeStringFloat(const base::string16& text,
-                              const FontList& font_list,
-                              float* width,
-                              float* height,
-                              int line_height,
-                              int flags);
-
-  // Returns the number of horizontal pixels needed to display the specified
-  // |text| with |font_list|.
-  static int GetStringWidth(const base::string16& text,
-                            const FontList& font_list);
-
-  // This is same as GetStringWidth except that fractional width is returned.
-  // Use this method for the scenario that multiple string widths need to be
-  // summed up. This is because GetStringWidth returns the ceiled width and
-  // adding multiple ceiled widths could cause more precision loss for certain
-  // platform like Mac where the fractioal width is used.
-  static float GetStringWidthF(const base::string16& text,
-                               const FontList& font_list);
-
-  // Returns the default text alignment to be used when drawing text on a
-  // Canvas based on the directionality of the system locale language.
-  // This function is used by Canvas::DrawStringRect when the text alignment
-  // is not specified.
-  //
-  // This function returns either Canvas::TEXT_ALIGN_LEFT or
-  // Canvas::TEXT_ALIGN_RIGHT.
-  static int DefaultCanvasTextAlignment();
-
-  // Draws text with a 1-pixel halo around it of the given color.
-  // On Windows, it allows ClearType to be drawn to an otherwise transparent
-  //   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|.
-  // On Mac, NOTIMPLEMENTED.
-  //   TODO(dhollowa): Skia-native implementation is underway.  Cut over to
-  //   that when ready.  http::/crbug.com/109946
-  void DrawStringRectWithHalo(const base::string16& text,
-                              const FontList& font_list,
-                              SkColor text_color,
-                              SkColor halo_color,
-                              const Rect& display_rect,
-                              int flags);
-
-  // Extracts an ImageSkiaRep from the contents of this canvas.
-  ImageSkiaRep ExtractImageRep() const;
-
-  // Draws a dashed rectangle of the specified color.
-  void DrawDashedRect(const Rect& rect, SkColor color);
-
-  // Saves a copy of the drawing state onto a stack, operating on this copy
-  // until a balanced call to Restore() is made.
-  void Save();
-
-  // As with Save(), except draws to a layer that is blended with the canvas
-  // at the specified alpha once Restore() is called.
-  // |layer_bounds| are the bounds of the layer relative to the current
-  // transform.
-  void SaveLayerAlpha(uint8 alpha);
-  void SaveLayerAlpha(uint8 alpha, const Rect& layer_bounds);
-
-  // Restores the drawing state after a call to Save*(). It is an error to
-  // call Restore() more times than Save*().
-  void Restore();
-
-  // Adds |rect| to the current clip.
-  void ClipRect(const Rect& rect);
-
-  // Adds |path| to the current clip. |do_anti_alias| is true if the clip
-  // should be antialiased.
-  void ClipPath(const SkPath& path, bool do_anti_alias);
-
-  // Returns true if the current clip is empty.
-  bool IsClipEmpty() const;
-
-  // Returns the bounds of the current clip (in local coordinates) in the
-  // |bounds| parameter, and returns true if it is non empty.
-  bool GetClipBounds(Rect* bounds);
-
-  void Translate(const Vector2d& offset);
-
-  void Scale(int x_scale, int y_scale);
-
-  // Fills the entire canvas' bitmap (restricted to current clip) with
-  // specified |color| using a transfer mode of SkXfermode::kSrcOver_Mode.
-  void DrawColor(SkColor color);
-
-  // Fills the entire canvas' bitmap (restricted to current clip) with
-  // specified |color| and |mode|.
-  void DrawColor(SkColor color, SkXfermode::Mode mode);
-
-  // Fills |rect| with |color| using a transfer mode of
-  // SkXfermode::kSrcOver_Mode.
-  void FillRect(const Rect& rect, SkColor color);
-
-  // Fills |rect| with the specified |color| and |mode|.
-  void FillRect(const Rect& rect, SkColor color, SkXfermode::Mode mode);
-
-  // Draws a single pixel rect in the specified region with the specified
-  // color, using a transfer mode of SkXfermode::kSrcOver_Mode.
-  //
-  // NOTE: if you need a single pixel line, use DrawLine.
-  void DrawRect(const Rect& rect, SkColor color);
-
-  // Draws a single pixel rect in the specified region with the specified
-  // color and transfer mode.
-  //
-  // NOTE: if you need a single pixel line, use DrawLine.
-  void DrawRect(const Rect& rect, SkColor color, SkXfermode::Mode mode);
-
-  // Draws the given rectangle with the given |paint| parameters.
-  void DrawRect(const Rect& rect, const SkPaint& paint);
-
-  // Draw the given point with the given |paint| parameters.
-  void DrawPoint(const Point& p, const SkPaint& paint);
-
-  // Draws a single pixel line with the specified color.
-  void DrawLine(const Point& p1, const Point& p2, SkColor color);
-
-  // Draws a line with the given |paint| parameters.
-  void DrawLine(const Point& p1, const Point& p2, const SkPaint& paint);
-
-  // Draws a circle with the given |paint| parameters.
-  void DrawCircle(const Point& center_point,
-                  int radius,
-                  const SkPaint& paint);
-
-  // Draws the given rectangle with rounded corners of |radius| using the
-  // given |paint| parameters.
-  void DrawRoundRect(const Rect& rect, int radius, const SkPaint& paint);
-
-  // Draws the given path using the given |paint| parameters.
-  void DrawPath(const SkPath& path, const SkPaint& paint);
-
-  // Draws an image with the origin at the specified location. The upper left
-  // corner of the bitmap is rendered at the specified location.
-  // Parameters are specified relative to current canvas scale not in pixels.
-  // Thus, x is 2 pixels if canvas scale = 2 & |x| = 1.
-  void DrawImageInt(const ImageSkia&, int x, int y);
-
-  // Helper for DrawImageInt(..., paint) that constructs a temporary paint and
-  // calls paint.setAlpha(alpha).
-  void DrawImageInt(const ImageSkia&, int x, int y, uint8 alpha);
-
-  // Draws an image with the origin at the specified location, using the
-  // specified paint. The upper left corner of the bitmap is rendered at the
-  // specified location.
-  // Parameters are specified relative to current canvas scale not in pixels.
-  // Thus, |x| is 2 pixels if canvas scale = 2 & |x| = 1.
-  void DrawImageInt(const ImageSkia& image,
-                    int x,
-                    int y,
-                    const SkPaint& paint);
-
-  // Draws a portion of an image in the specified location. The src parameters
-  // correspond to the region of the bitmap to draw in the region defined
-  // by the dest coordinates.
-  //
-  // If the width or height of the source differs from that of the destination,
-  // the image will be scaled. When scaling down, a mipmap will be generated.
-  // Set |filter| to use filtering for images, otherwise the nearest-neighbor
-  // algorithm is used for resampling.
-  //
-  // An optional custom SkPaint can be provided.
-  // Parameters are specified relative to current canvas scale not in pixels.
-  // Thus, |x| is 2 pixels if canvas scale = 2 & |x| = 1.
-  void DrawImageInt(const ImageSkia& image,
-                    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);
-  void DrawImageInt(const ImageSkia& image,
-                    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);
-
-  // Same as the DrawImageInt functions above. Difference being this does not
-  // do any scaling, i.e. it assumes that the source/destination/image, etc are
-  // in pixels. It does translate the destination rectangle to ensure that the
-  // image is displayed at the correct pixel coordinates.
-  void DrawImageIntInPixel(const ImageSkia& image,
-                           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);
-
-  // Draws an |image| with the top left corner at |x| and |y|, clipped to
-  // |path|.
-  // Parameters are specified relative to current canvas scale not in pixels.
-  // Thus, x is 2 pixels if canvas scale = 2 & |x| = 1.
-  void DrawImageInPath(const ImageSkia& image,
-                       int x,
-                       int y,
-                       const SkPath& path,
-                       const SkPaint& paint);
-
-  // Draws text with the specified color, fonts 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 DrawStringRect(const base::string16& text,
-                      const FontList& font_list,
-                      SkColor color,
-                      const Rect& display_rect);
-
-  // Draws text with the specified color, fonts and location. The last argument
-  // specifies flags for how the text should be rendered. It can be one of
-  // TEXT_ALIGN_CENTER, TEXT_ALIGN_RIGHT or TEXT_ALIGN_LEFT.
-  void DrawStringRectWithFlags(const base::string16& text,
-                               const FontList& font_list,
-                               SkColor color,
-                               const Rect& display_rect,
-                               int flags);
-
-  // Similar to above DrawStringRect method but with text shadows support.
-  // Currently it's only implemented for canvas skia. Specifying a 0 line_height
-  // will cause the default height to be used.
-  void DrawStringRectWithShadows(const base::string16& text,
-                                 const FontList& font_list,
-                                 SkColor color,
-                                 const Rect& text_bounds,
-                                 int line_height,
-                                 int flags,
-                                 const ShadowValues& shadows);
-
-  // Draws a dotted gray rectangle used for focus purposes.
-  void DrawFocusRect(const Rect& rect);
-
-  // Draws a |rect| in the specified region with the specified |color| with a
-  // with of one logical pixel which might be more device pixels.
-  void DrawSolidFocusRect(const Rect& rect, SkColor color);
-
-  // Tiles the image in the specified region.
-  // Parameters are specified relative to current canvas scale not in pixels.
-  // Thus, |x| is 2 pixels if canvas scale = 2 & |x| = 1.
-  void TileImageInt(const ImageSkia& image,
-                    int x,
-                    int y,
-                    int w,
-                    int h);
-  void TileImageInt(const ImageSkia& image,
-                    int src_x,
-                    int src_y,
-                    int dest_x,
-                    int dest_y,
-                    int w,
-                    int h);
-  void TileImageInt(const ImageSkia& image,
-                    int src_x,
-                    int src_y,
-                    float tile_scale_x,
-                    float tile_scale_y,
-                    int dest_x,
-                    int dest_y,
-                    int w,
-                    int h);
-
-  // Returns a native drawing context for platform specific drawing routines to
-  // use. Must be balanced by a call to EndPlatformPaint().
-  NativeDrawingContext BeginPlatformPaint();
-
-  // Signifies the end of platform drawing using the native drawing context
-  // returned by BeginPlatformPaint().
-  void EndPlatformPaint();
-
-  // Apply transformation on the canvas.
-  void Transform(const Transform& transform);
-
-  // Draws the given string with a fade gradient at the end.
-  void DrawFadedString(const base::string16& text,
-                       const FontList& font_list,
-                       SkColor color,
-                       const Rect& display_rect,
-                       int flags);
-
-  skia::PlatformCanvas* platform_canvas() { return owned_canvas_.get(); }
-  SkCanvas* sk_canvas() { return canvas_; }
-  float image_scale() const { return image_scale_; }
-
- private:
-  Canvas(SkCanvas* canvas, float image_scale);
-
-  // Test whether the provided rectangle intersects the current clip rect.
-  bool IntersectsClipRectInt(int x, int y, int w, int h);
-  bool IntersectsClipRect(const Rect& rect);
-
-  // Helper for the DrawImageInt functions declared above. The |pixel|
-  // parameter if true indicates that the bounds and the image are to
-  // be assumed to be in pixels, i.e. no scaling needs to be performed.
-  void DrawImageIntHelper(const ImageSkia& image,
-                          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,
-                          float image_scale,
-                          bool pixel);
-
-  // The device scale factor at which drawing on this canvas occurs.
-  // An additional scale can be applied via Canvas::Scale(). However,
-  // Canvas::Scale() does not affect |image_scale_|.
-  float image_scale_;
-
-  skia::RefPtr<skia::PlatformCanvas> owned_canvas_;
-  SkCanvas* canvas_;
-
-  DISALLOW_COPY_AND_ASSIGN(Canvas);
-};
-
-}  // namespace gfx
-
-#endif  // UI_GFX_CANVAS_H_