1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
|
// 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_SKIA_H_
#define GFX_CANVAS_SKIA_H_
#include "base/basictypes.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 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::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
#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
// Extracts a bitmap from the contents of this canvas.
SkBitmap ExtractBitmap() const;
// Overridden from Canvas2:
virtual void Save();
virtual void SaveLayerAlpha(U8CPU alpha);
virtual void SaveLayerAlpha(U8CPU alpha, const gfx::Rect& layer_bounds);
virtual void Restore();
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 CanvasSkia* AsCanvasSkia();
virtual const CanvasSkia* AsCanvasSkia() const;
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(CanvasSkia);
};
} // namespace gfx;
#endif // GFX_CANVAS_SKIA_H_
|
