3 * Copyright 2013 Google Inc.
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
9 #ifndef SkBitmapDevice_DEFINED
10 #define SkBitmapDevice_DEFINED
14 ///////////////////////////////////////////////////////////////////////////////
15 class SK_API SkBitmapDevice : public SkBaseDevice {
17 SK_DECLARE_INST_COUNT(SkBitmapDevice)
20 * Construct a new device with the specified bitmap as its backend. It is
21 * valid for the bitmap to have no pixels associated with it. In that case,
22 * any drawing to this device will have no effect.
24 SkBitmapDevice(const SkBitmap& bitmap);
27 * Construct a new device with the specified bitmap as its backend. It is
28 * valid for the bitmap to have no pixels associated with it. In that case,
29 * any drawing to this device will have no effect.
31 SkBitmapDevice(const SkBitmap& bitmap, const SkDeviceProperties& deviceProperties);
33 static SkBitmapDevice* Create(const SkImageInfo&,
34 const SkDeviceProperties* = NULL);
36 /** Return the width of the device (in pixels).
38 virtual int width() const SK_OVERRIDE { return fBitmap.width(); }
39 /** Return the height of the device (in pixels).
41 virtual int height() const SK_OVERRIDE { return fBitmap.height(); }
43 /** Returns true if the device's bitmap's config treats every pixels as
46 virtual bool isOpaque() const SK_OVERRIDE { return fBitmap.isOpaque(); }
48 /** Return the bitmap config of the device's pixels
50 virtual SkBitmap::Config config() const SK_OVERRIDE { return fBitmap.config(); }
52 virtual SkImageInfo imageInfo() const SK_OVERRIDE;
55 * Return the device's associated gpu render target, or NULL.
57 virtual GrRenderTarget* accessRenderTarget() SK_OVERRIDE { return NULL; }
61 * Device may filter the text flags for drawing text here. If it wants to
62 * make a change to the specified values, it should write them into the
63 * textflags parameter (output) and return true. If the paint is fine as
64 * is, then ignore the textflags parameter and return false.
66 * The baseclass SkDevice filters based on its depth and blitters.
68 virtual bool filterTextFlags(const SkPaint& paint, TextFlags*) SK_OVERRIDE;
70 /** Clears the entire device to the specified color (including alpha).
73 virtual void clear(SkColor color) SK_OVERRIDE;
75 /** These are called inside the per-device-layer loop for each draw call.
76 When these are called, we have already applied any saveLayer operations,
77 and are handling any looping from the paint, and any effects from the
80 virtual void drawPaint(const SkDraw&, const SkPaint& paint) SK_OVERRIDE;
81 virtual void drawPoints(const SkDraw&, SkCanvas::PointMode mode, size_t count,
82 const SkPoint[], const SkPaint& paint) SK_OVERRIDE;
83 virtual void drawRect(const SkDraw&, const SkRect& r,
84 const SkPaint& paint) SK_OVERRIDE;
85 virtual void drawOval(const SkDraw&, const SkRect& oval,
86 const SkPaint& paint) SK_OVERRIDE;
87 virtual void drawRRect(const SkDraw&, const SkRRect& rr,
88 const SkPaint& paint) SK_OVERRIDE;
91 * If pathIsMutable, then the implementation is allowed to cast path to a
92 * non-const pointer and modify it in place (as an optimization). Canvas
93 * may do this to implement helpers such as drawOval, by placing a temp
94 * path on the stack to hold the representation of the oval.
96 * If prePathMatrix is not null, it should logically be applied before any
97 * stroking or other effects. If there are no effects on the paint that
98 * affect the geometry/rasterization, then the pre matrix can just be
99 * pre-concated with the current matrix.
101 virtual void drawPath(const SkDraw&, const SkPath& path,
102 const SkPaint& paint,
103 const SkMatrix* prePathMatrix = NULL,
104 bool pathIsMutable = false) SK_OVERRIDE;
105 virtual void drawBitmap(const SkDraw&, const SkBitmap& bitmap,
106 const SkMatrix& matrix, const SkPaint& paint) SK_OVERRIDE;
107 virtual void drawSprite(const SkDraw&, const SkBitmap& bitmap,
108 int x, int y, const SkPaint& paint) SK_OVERRIDE;
111 * The default impl. will create a bitmap-shader from the bitmap,
112 * and call drawRect with it.
114 virtual void drawBitmapRect(const SkDraw&, const SkBitmap&,
115 const SkRect* srcOrNull, const SkRect& dst,
116 const SkPaint& paint,
117 SkCanvas::DrawBitmapRectFlags flags) SK_OVERRIDE;
120 * Does not handle text decoration.
121 * Decorations (underline and stike-thru) will be handled by SkCanvas.
123 virtual void drawText(const SkDraw&, const void* text, size_t len,
124 SkScalar x, SkScalar y, const SkPaint& paint) SK_OVERRIDE;
125 virtual void drawPosText(const SkDraw&, const void* text, size_t len,
126 const SkScalar pos[], SkScalar constY,
127 int scalarsPerPos, const SkPaint& paint) SK_OVERRIDE;
128 virtual void drawTextOnPath(const SkDraw&, const void* text, size_t len,
129 const SkPath& path, const SkMatrix* matrix,
130 const SkPaint& paint) SK_OVERRIDE;
131 virtual void drawVertices(const SkDraw&, SkCanvas::VertexMode, int vertexCount,
132 const SkPoint verts[], const SkPoint texs[],
133 const SkColor colors[], SkXfermode* xmode,
134 const uint16_t indices[], int indexCount,
135 const SkPaint& paint) SK_OVERRIDE;
136 /** The SkBaseDevice passed will be an SkBaseDevice which was returned by a call to
137 onCreateDevice on this device with kSaveLayer_Usage.
139 virtual void drawDevice(const SkDraw&, SkBaseDevice*, int x, int y,
140 const SkPaint&) SK_OVERRIDE;
142 ///////////////////////////////////////////////////////////////////////////
144 /** Update as needed the pixel value in the bitmap, so that the caller can
145 access the pixels directly. Note: only the pixels field should be
146 altered. The config/width/height/rowbytes must remain unchanged.
147 @return the device contents as a bitmap
149 virtual const SkBitmap& onAccessBitmap() SK_OVERRIDE;
151 SkPixelRef* getPixelRef() const { return fBitmap.pixelRef(); }
152 // just for subclasses, to assign a custom pixelref
153 SkPixelRef* setPixelRef(SkPixelRef* pr) {
154 fBitmap.setPixelRef(pr);
158 virtual bool onReadPixels(const SkImageInfo&, void*, size_t, int x, int y) SK_OVERRIDE;
159 virtual bool onWritePixels(const SkImageInfo&, const void*, size_t, int, int) SK_OVERRIDE;
160 virtual void* onAccessPixels(SkImageInfo* info, size_t* rowBytes) SK_OVERRIDE;
162 /** Called when this device is installed into a Canvas. Balanced by a call
163 to unlockPixels() when the device is removed from a Canvas.
165 virtual void lockPixels() SK_OVERRIDE;
166 virtual void unlockPixels() SK_OVERRIDE;
169 * Returns true if the device allows processing of this imagefilter. If
170 * false is returned, then the filter is ignored. This may happen for
171 * some subclasses that do not support pixel manipulations after drawing
172 * has occurred (e.g. printing). The default implementation returns true.
174 virtual bool allowImageFilter(const SkImageFilter*) SK_OVERRIDE;
177 * Override and return true for filters that the device can handle
178 * intrinsically. Doing so means that SkCanvas will pass-through this
179 * filter to drawSprite and drawDevice (and potentially filterImage).
180 * Returning false means the SkCanvas will have apply the filter itself,
181 * and just pass the resulting image to the device.
183 virtual bool canHandleImageFilter(const SkImageFilter*) SK_OVERRIDE;
186 * Related (but not required) to canHandleImageFilter, this method returns
187 * true if the device could apply the filter to the src bitmap and return
188 * the result (and updates offset as needed).
189 * If the device does not recognize or support this filter,
190 * it just returns false and leaves result and offset unchanged.
192 virtual bool filterImage(const SkImageFilter*, const SkBitmap&, const SkImageFilter::Context&,
193 SkBitmap* result, SkIPoint* offset) SK_OVERRIDE;
196 friend class SkCanvas;
197 friend struct DeviceCM; //for setMatrixClip
199 friend class SkDrawIter;
200 friend class SkDeviceFilteredPaint;
201 friend class SkDeviceImageFilterProxy;
203 friend class SkSurface_Raster;
205 // used to change the backend's pixels (and possibly config/rowbytes)
206 // but cannot change the width/height, so there should be no change to
207 // any clip information.
208 virtual void replaceBitmapBackendForRasterSurface(const SkBitmap&) SK_OVERRIDE;
210 virtual SkBaseDevice* onCreateDevice(const SkImageInfo&, Usage) SK_OVERRIDE;
212 /** Causes any deferred drawing to the device to be completed.
214 virtual void flush() SK_OVERRIDE {}
216 virtual SkSurface* newSurface(const SkImageInfo&) SK_OVERRIDE;
217 virtual const void* peekPixels(SkImageInfo*, size_t* rowBytes) SK_OVERRIDE;
221 typedef SkBaseDevice INHERITED;
224 #endif // SkBitmapDevice_DEFINED