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. 4 5 #ifndef SKIA_EXT_VECTOR_PLATFORM_DEVICE_EMF_WIN_H_ 6 #define SKIA_EXT_VECTOR_PLATFORM_DEVICE_EMF_WIN_H_ 7 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" 13 14 namespace skia { 15 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 // TODO(robertphillips): Once Skia's SkBaseDevice is refactored to remove 21 // the bitmap-specific entry points, this class should derive from it. 22 class VectorPlatformDeviceEmf : public SkBitmapDevice, public PlatformDevice { 23 public: 24 SK_API static SkBaseDevice* CreateDevice(int width, int height, bool isOpaque, 25 HANDLE shared_section); 26 27 // Factory function. The DC is kept as the output context. 28 static SkBaseDevice* create(HDC dc, int width, int height); 29 30 VectorPlatformDeviceEmf(HDC dc, const SkBitmap& bitmap); 31 virtual ~VectorPlatformDeviceEmf(); 32 33 // PlatformDevice methods 34 virtual PlatformSurface BeginPlatformPaint() OVERRIDE; 35 virtual void DrawToNativeContext(HDC dc, int x, int y, 36 const RECT* src_rect) OVERRIDE; 37 // SkBaseDevice methods. 38 virtual void drawPaint(const SkDraw& draw, const SkPaint& paint) OVERRIDE; 39 virtual void drawPoints(const SkDraw& draw, SkCanvas::PointMode mode, 40 size_t count, const SkPoint[], 41 const SkPaint& paint) OVERRIDE; 42 virtual void drawRect(const SkDraw& draw, const SkRect& r, 43 const SkPaint& paint) OVERRIDE; 44 virtual void drawRRect(const SkDraw&, const SkRRect& rr, 45 const SkPaint& paint) OVERRIDE; 46 virtual void drawPath(const SkDraw& draw, const SkPath& path, 47 const SkPaint& paint, 48 const SkMatrix* prePathMatrix = NULL, 49 bool pathIsMutable = false) OVERRIDE; 50 virtual void drawBitmapRect(const SkDraw& draw, const SkBitmap& bitmap, 51 const SkRect* src, const SkRect& dst, 52 const SkPaint& paint, 53 SkCanvas::DrawBitmapRectFlags flags) SK_OVERRIDE; 54 virtual void drawBitmap(const SkDraw& draw, const SkBitmap& bitmap, 55 const SkMatrix& matrix, 56 const SkPaint& paint) OVERRIDE; 57 virtual void drawSprite(const SkDraw& draw, const SkBitmap& bitmap, 58 int x, int y, const SkPaint& paint) OVERRIDE; 59 virtual void drawText(const SkDraw& draw, const void* text, size_t len, 60 SkScalar x, SkScalar y, const SkPaint& paint) OVERRIDE; 61 virtual void drawPosText(const SkDraw& draw, const void* text, size_t len, 62 const SkScalar pos[], SkScalar constY, 63 int scalarsPerPos, const SkPaint& paint) OVERRIDE; 64 virtual void drawTextOnPath(const SkDraw& draw, const void* text, size_t len, 65 const SkPath& path, const SkMatrix* matrix, 66 const SkPaint& paint) OVERRIDE; 67 virtual void drawVertices(const SkDraw& draw, SkCanvas::VertexMode, 68 int vertexCount, 69 const SkPoint verts[], const SkPoint texs[], 70 const SkColor colors[], SkXfermode* xmode, 71 const uint16_t indices[], int indexCount, 72 const SkPaint& paint) OVERRIDE; 73 virtual void drawDevice(const SkDraw& draw, SkBaseDevice*, int x, int y, 74 const SkPaint&) OVERRIDE; 75 76 virtual void setMatrixClip(const SkMatrix& transform, const SkRegion& region, 77 const SkClipStack&) OVERRIDE; 78 79 void LoadClipRegion(); 80 81 protected: 82 #ifdef SK_SUPPORT_LEGACY_COMPATIBLEDEVICE_CONFIG 83 virtual SkBaseDevice* onCreateCompatibleDevice(SkBitmap::Config, int width, 84 int height, bool isOpaque, 85 Usage usage) OVERRIDE; 86 #endif 87 virtual SkBaseDevice* onCreateDevice(const SkImageInfo& info, 88 Usage usage) OVERRIDE; 89 90 private: 91 // Applies the SkPaint's painting properties in the current GDI context, if 92 // possible. If GDI can't support all paint's properties, returns false. It 93 // doesn't execute the "commands" in SkPaint. 94 bool ApplyPaint(const SkPaint& paint); 95 96 // Selects a new object in the device context. It can be a pen, a brush, a 97 // clipping region, a bitmap or a font. Returns the old selected object. 98 HGDIOBJ SelectObject(HGDIOBJ object); 99 100 // Creates a brush according to SkPaint's properties. 101 bool CreateBrush(bool use_brush, const SkPaint& paint); 102 103 // Creates a pen according to SkPaint's properties. 104 bool CreatePen(bool use_pen, const SkPaint& paint); 105 106 // Restores back the previous objects (pen, brush, etc) after a paint command. 107 void Cleanup(); 108 109 // Creates a brush according to SkPaint's properties. 110 bool CreateBrush(bool use_brush, COLORREF color); 111 112 // Creates a pen according to SkPaint's properties. 113 bool CreatePen(bool use_pen, COLORREF color, int stroke_width, 114 float stroke_miter, DWORD pen_style); 115 116 // Draws a bitmap in the the device, using the currently loaded matrix. 117 void InternalDrawBitmap(const SkBitmap& bitmap, int x, int y, 118 const SkPaint& paint); 119 120 // The Windows Device Context handle. It is the backend used with GDI drawing. 121 // This backend is write-only and vectorial. 122 HDC hdc_; 123 124 // Translation assigned to the DC: we need to keep track of this separately 125 // so it can be updated even if the DC isn't created yet. 126 SkMatrix transform_; 127 128 // The current clipping 129 SkRegion clip_region_; 130 131 // Previously selected brush before the current drawing. 132 HGDIOBJ previous_brush_; 133 134 // Previously selected pen before the current drawing. 135 HGDIOBJ previous_pen_; 136 137 DISALLOW_COPY_AND_ASSIGN(VectorPlatformDeviceEmf); 138 }; 139 140 typedef void (*SkiaEnsureTypefaceCharactersAccessible) 141 (const LOGFONT& font, const wchar_t* text, unsigned int text_length); 142 143 SK_API void SetSkiaEnsureTypefaceCharactersAccessible( 144 SkiaEnsureTypefaceCharactersAccessible func); 145 146 } // namespace skia 147 148 #endif // SKIA_EXT_VECTOR_PLATFORM_DEVICE_EMF_WIN_H_ 149
