Separate Simple Backend creation from initialization.
[chromium-blink-merge.git] / skia / ext / vector_platform_device_emf_win.h
blob461dddcea21c2faa63fdf14fce995ef6c124b906
1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #ifndef SKIA_EXT_VECTOR_PLATFORM_DEVICE_EMF_WIN_H_
6 #define SKIA_EXT_VECTOR_PLATFORM_DEVICE_EMF_WIN_H_
8 #include "base/basictypes.h"
9 #include "base/compiler_specific.h"
10 #include "skia/ext/platform_device.h"
11 #include "third_party/skia/include/core/SkMatrix.h"
12 #include "third_party/skia/include/core/SkRegion.h"
14 namespace skia {
16 // A device is basically a wrapper around SkBitmap that provides a surface for
17 // SkCanvas to draw into. This specific device is not not backed by a surface
18 // and is thus unreadable. This is because the backend is completely vectorial.
19 // This device is a simple wrapper over a Windows device context (HDC) handle.
20 class VectorPlatformDeviceEmf : public SkDevice, public PlatformDevice {
21 public:
22 SK_API static SkDevice* CreateDevice(int width, int height, bool isOpaque,
23 HANDLE shared_section);
25 // Factory function. The DC is kept as the output context.
26 static SkDevice* create(HDC dc, int width, int height);
28 VectorPlatformDeviceEmf(HDC dc, const SkBitmap& bitmap);
29 virtual ~VectorPlatformDeviceEmf();
31 // PlatformDevice methods
32 virtual PlatformSurface BeginPlatformPaint() OVERRIDE;
33 virtual void DrawToNativeContext(HDC dc, int x, int y,
34 const RECT* src_rect) OVERRIDE;
35 // SkDevice methods.
36 virtual uint32_t getDeviceCapabilities();
37 virtual void drawPaint(const SkDraw& draw, const SkPaint& paint) OVERRIDE;
38 virtual void drawPoints(const SkDraw& draw, SkCanvas::PointMode mode,
39 size_t count, const SkPoint[],
40 const SkPaint& paint) OVERRIDE;
41 virtual void drawRect(const SkDraw& draw, const SkRect& r,
42 const SkPaint& paint) OVERRIDE;
43 virtual void drawPath(const SkDraw& draw, const SkPath& path,
44 const SkPaint& paint,
45 const SkMatrix* prePathMatrix = NULL,
46 bool pathIsMutable = false) OVERRIDE;
47 virtual void drawBitmapRect(const SkDraw& draw, const SkBitmap& bitmap,
48 const SkRect* src, const SkRect& dst,
49 const SkPaint& paint) SK_OVERRIDE;
50 virtual void drawBitmap(const SkDraw& draw, const SkBitmap& bitmap,
51 const SkIRect* srcRectOrNull,
52 const SkMatrix& matrix,
53 const SkPaint& paint) OVERRIDE;
54 virtual void drawSprite(const SkDraw& draw, const SkBitmap& bitmap,
55 int x, int y, const SkPaint& paint) OVERRIDE;
56 virtual void drawText(const SkDraw& draw, const void* text, size_t len,
57 SkScalar x, SkScalar y, const SkPaint& paint) OVERRIDE;
58 virtual void drawPosText(const SkDraw& draw, const void* text, size_t len,
59 const SkScalar pos[], SkScalar constY,
60 int scalarsPerPos, const SkPaint& paint) OVERRIDE;
61 virtual void drawTextOnPath(const SkDraw& draw, const void* text, size_t len,
62 const SkPath& path, const SkMatrix* matrix,
63 const SkPaint& paint) OVERRIDE;
64 virtual void drawVertices(const SkDraw& draw, SkCanvas::VertexMode,
65 int vertexCount,
66 const SkPoint verts[], const SkPoint texs[],
67 const SkColor colors[], SkXfermode* xmode,
68 const uint16_t indices[], int indexCount,
69 const SkPaint& paint) OVERRIDE;
70 virtual void drawDevice(const SkDraw& draw, SkDevice*, int x, int y,
71 const SkPaint&) OVERRIDE;
73 virtual void setMatrixClip(const SkMatrix& transform, const SkRegion& region,
74 const SkClipStack&) OVERRIDE;
76 void LoadClipRegion();
78 protected:
79 virtual SkDevice* onCreateCompatibleDevice(SkBitmap::Config, int width,
80 int height, bool isOpaque,
81 Usage usage) OVERRIDE;
83 private:
84 // Applies the SkPaint's painting properties in the current GDI context, if
85 // possible. If GDI can't support all paint's properties, returns false. It
86 // doesn't execute the "commands" in SkPaint.
87 bool ApplyPaint(const SkPaint& paint);
89 // Selects a new object in the device context. It can be a pen, a brush, a
90 // clipping region, a bitmap or a font. Returns the old selected object.
91 HGDIOBJ SelectObject(HGDIOBJ object);
93 // Creates a brush according to SkPaint's properties.
94 bool CreateBrush(bool use_brush, const SkPaint& paint);
96 // Creates a pen according to SkPaint's properties.
97 bool CreatePen(bool use_pen, const SkPaint& paint);
99 // Restores back the previous objects (pen, brush, etc) after a paint command.
100 void Cleanup();
102 // Creates a brush according to SkPaint's properties.
103 bool CreateBrush(bool use_brush, COLORREF color);
105 // Creates a pen according to SkPaint's properties.
106 bool CreatePen(bool use_pen, COLORREF color, int stroke_width,
107 float stroke_miter, DWORD pen_style);
109 // Draws a bitmap in the the device, using the currently loaded matrix.
110 void InternalDrawBitmap(const SkBitmap& bitmap, int x, int y,
111 const SkPaint& paint);
113 // The Windows Device Context handle. It is the backend used with GDI drawing.
114 // This backend is write-only and vectorial.
115 HDC hdc_;
117 // Translation assigned to the DC: we need to keep track of this separately
118 // so it can be updated even if the DC isn't created yet.
119 SkMatrix transform_;
121 // The current clipping
122 SkRegion clip_region_;
124 // Previously selected brush before the current drawing.
125 HGDIOBJ previous_brush_;
127 // Previously selected pen before the current drawing.
128 HGDIOBJ previous_pen_;
130 DISALLOW_COPY_AND_ASSIGN(VectorPlatformDeviceEmf);
133 typedef void (*SkiaEnsureTypefaceCharactersAccessible)
134 (const LOGFONT& font, const wchar_t* text, unsigned int text_length);
136 SK_API void SetSkiaEnsureTypefaceCharactersAccessible(
137 SkiaEnsureTypefaceCharactersAccessible func);
139 } // namespace skia
141 #endif // SKIA_EXT_VECTOR_PLATFORM_DEVICE_EMF_WIN_H_