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 #ifdef SK_SUPPORT_LEGACY_COMPATIBLEDEVICE_CONFIG
35 * Create a new raster device and have the pixels be automatically
36 * allocated. The rowBytes of the device will be computed automatically
37 * based on the config and the width.
39 * @param config The desired config for the pixels. If the request cannot
40 * be met, the closest matching support config will be used.
41 * @param width width (in pixels) of the device
42 * @param height height (in pixels) of the device
43 * @param isOpaque Set to true if it is known that all of the pixels will
44 * be drawn to opaquely. Used as an accelerator when drawing
45 * these pixels to another device.
47 SkBitmapDevice(SkBitmap::Config config, int width, int height, bool isOpaque = false);
50 * Create a new raster device and have the pixels be automatically
51 * allocated. The rowBytes of the device will be computed automatically
52 * based on the config and the width.
54 * @param config The desired config for the pixels. If the request cannot
55 * be met, the closest matching support config will be used.
56 * @param width width (in pixels) of the device
57 * @param height height (in pixels) of the device
58 * @param isOpaque Set to true if it is known that all of the pixels will
59 * be drawn to opaquely. Used as an accelerator when drawing
60 * these pixels to another device.
61 * @param deviceProperties Properties which affect compositing.
63 SkBitmapDevice(SkBitmap::Config config, int width, int height, bool isOpaque,
64 const SkDeviceProperties& deviceProperties);
66 static SkBitmapDevice* Create(const SkImageInfo&,
67 const SkDeviceProperties* = NULL);
69 /** Return the width of the device (in pixels).
71 virtual int width() const SK_OVERRIDE { return fBitmap.width(); }
72 /** Return the height of the device (in pixels).
74 virtual int height() const SK_OVERRIDE { return fBitmap.height(); }
76 /** Returns true if the device's bitmap's config treats every pixels as
79 virtual bool isOpaque() const SK_OVERRIDE { return fBitmap.isOpaque(); }
81 /** Return the bitmap config of the device's pixels
83 virtual SkBitmap::Config config() const SK_OVERRIDE { return fBitmap.config(); }
85 virtual SkImageInfo imageInfo() const SK_OVERRIDE;
88 * Return the device's associated gpu render target, or NULL.
90 virtual GrRenderTarget* accessRenderTarget() SK_OVERRIDE { return NULL; }
94 * Device may filter the text flags for drawing text here. If it wants to
95 * make a change to the specified values, it should write them into the
96 * textflags parameter (output) and return true. If the paint is fine as
97 * is, then ignore the textflags parameter and return false.
99 * The baseclass SkDevice filters based on its depth and blitters.
101 virtual bool filterTextFlags(const SkPaint& paint, TextFlags*) SK_OVERRIDE;
103 /** Clears the entire device to the specified color (including alpha).
106 virtual void clear(SkColor color) SK_OVERRIDE;
108 /** These are called inside the per-device-layer loop for each draw call.
109 When these are called, we have already applied any saveLayer operations,
110 and are handling any looping from the paint, and any effects from the
113 virtual void drawPaint(const SkDraw&, const SkPaint& paint) SK_OVERRIDE;
114 virtual void drawPoints(const SkDraw&, SkCanvas::PointMode mode, size_t count,
115 const SkPoint[], const SkPaint& paint) SK_OVERRIDE;
116 virtual void drawRect(const SkDraw&, const SkRect& r,
117 const SkPaint& paint) SK_OVERRIDE;
118 virtual void drawOval(const SkDraw&, const SkRect& oval,
119 const SkPaint& paint) SK_OVERRIDE;
120 virtual void drawRRect(const SkDraw&, const SkRRect& rr,
121 const SkPaint& paint) SK_OVERRIDE;
124 * If pathIsMutable, then the implementation is allowed to cast path to a
125 * non-const pointer and modify it in place (as an optimization). Canvas
126 * may do this to implement helpers such as drawOval, by placing a temp
127 * path on the stack to hold the representation of the oval.
129 * If prePathMatrix is not null, it should logically be applied before any
130 * stroking or other effects. If there are no effects on the paint that
131 * affect the geometry/rasterization, then the pre matrix can just be
132 * pre-concated with the current matrix.
134 virtual void drawPath(const SkDraw&, const SkPath& path,
135 const SkPaint& paint,
136 const SkMatrix* prePathMatrix = NULL,
137 bool pathIsMutable = false) SK_OVERRIDE;
138 virtual void drawBitmap(const SkDraw&, const SkBitmap& bitmap,
139 const SkMatrix& matrix, const SkPaint& paint) SK_OVERRIDE;
140 virtual void drawSprite(const SkDraw&, const SkBitmap& bitmap,
141 int x, int y, const SkPaint& paint) SK_OVERRIDE;
144 * The default impl. will create a bitmap-shader from the bitmap,
145 * and call drawRect with it.
147 virtual void drawBitmapRect(const SkDraw&, const SkBitmap&,
148 const SkRect* srcOrNull, const SkRect& dst,
149 const SkPaint& paint,
150 SkCanvas::DrawBitmapRectFlags flags) SK_OVERRIDE;
153 * Does not handle text decoration.
154 * Decorations (underline and stike-thru) will be handled by SkCanvas.
156 virtual void drawText(const SkDraw&, const void* text, size_t len,
157 SkScalar x, SkScalar y, const SkPaint& paint) SK_OVERRIDE;
158 virtual void drawPosText(const SkDraw&, const void* text, size_t len,
159 const SkScalar pos[], SkScalar constY,
160 int scalarsPerPos, const SkPaint& paint) SK_OVERRIDE;
161 virtual void drawTextOnPath(const SkDraw&, const void* text, size_t len,
162 const SkPath& path, const SkMatrix* matrix,
163 const SkPaint& paint) SK_OVERRIDE;
164 virtual void drawVertices(const SkDraw&, SkCanvas::VertexMode, int vertexCount,
165 const SkPoint verts[], const SkPoint texs[],
166 const SkColor colors[], SkXfermode* xmode,
167 const uint16_t indices[], int indexCount,
168 const SkPaint& paint) SK_OVERRIDE;
169 /** The SkBaseDevice passed will be an SkBaseDevice which was returned by a call to
170 onCreateDevice on this device with kSaveLayer_Usage.
172 virtual void drawDevice(const SkDraw&, SkBaseDevice*, int x, int y,
173 const SkPaint&) SK_OVERRIDE;
175 ///////////////////////////////////////////////////////////////////////////
177 /** Update as needed the pixel value in the bitmap, so that the caller can
178 access the pixels directly. Note: only the pixels field should be
179 altered. The config/width/height/rowbytes must remain unchanged.
180 @return the device contents as a bitmap
182 virtual const SkBitmap& onAccessBitmap() SK_OVERRIDE;
184 SkPixelRef* getPixelRef() const { return fBitmap.pixelRef(); }
185 // just for subclasses, to assign a custom pixelref
186 SkPixelRef* setPixelRef(SkPixelRef* pr) {
187 fBitmap.setPixelRef(pr);
191 virtual bool onReadPixels(const SkImageInfo&, void*, size_t, int x, int y) SK_OVERRIDE;
192 virtual bool onWritePixels(const SkImageInfo&, const void*, size_t, int, int) SK_OVERRIDE;
193 virtual void* onAccessPixels(SkImageInfo* info, size_t* rowBytes) SK_OVERRIDE;
195 /** Called when this device is installed into a Canvas. Balanced by a call
196 to unlockPixels() when the device is removed from a Canvas.
198 virtual void lockPixels() SK_OVERRIDE;
199 virtual void unlockPixels() SK_OVERRIDE;
202 * Returns true if the device allows processing of this imagefilter. If
203 * false is returned, then the filter is ignored. This may happen for
204 * some subclasses that do not support pixel manipulations after drawing
205 * has occurred (e.g. printing). The default implementation returns true.
207 virtual bool allowImageFilter(const SkImageFilter*) SK_OVERRIDE;
210 * Override and return true for filters that the device can handle
211 * intrinsically. Doing so means that SkCanvas will pass-through this
212 * filter to drawSprite and drawDevice (and potentially filterImage).
213 * Returning false means the SkCanvas will have apply the filter itself,
214 * and just pass the resulting image to the device.
216 virtual bool canHandleImageFilter(const SkImageFilter*) SK_OVERRIDE;
219 * Related (but not required) to canHandleImageFilter, this method returns
220 * true if the device could apply the filter to the src bitmap and return
221 * the result (and updates offset as needed).
222 * If the device does not recognize or support this filter,
223 * it just returns false and leaves result and offset unchanged.
225 virtual bool filterImage(const SkImageFilter*, const SkBitmap&, const SkImageFilter::Context&,
226 SkBitmap* result, SkIPoint* offset) SK_OVERRIDE;
229 friend class SkCanvas;
230 friend struct DeviceCM; //for setMatrixClip
232 friend class SkDrawIter;
233 friend class SkDeviceFilteredPaint;
234 friend class SkDeviceImageFilterProxy;
236 friend class SkSurface_Raster;
238 // used to change the backend's pixels (and possibly config/rowbytes)
239 // but cannot change the width/height, so there should be no change to
240 // any clip information.
241 virtual void replaceBitmapBackendForRasterSurface(const SkBitmap&) SK_OVERRIDE;
243 #ifdef SK_SUPPORT_LEGACY_COMPATIBLEDEVICE_CONFIG
244 // in support of legacy constructors
245 void init(SkBitmap::Config config, int width, int height, bool isOpaque);
248 virtual SkBaseDevice* onCreateDevice(const SkImageInfo&, Usage) SK_OVERRIDE;
250 /** Causes any deferred drawing to the device to be completed.
252 virtual void flush() SK_OVERRIDE {}
254 virtual SkSurface* newSurface(const SkImageInfo&) SK_OVERRIDE;
255 virtual const void* peekPixels(SkImageInfo*, size_t* rowBytes) SK_OVERRIDE;
259 typedef SkBaseDevice INHERITED;
262 #endif // SkBitmapDevice_DEFINED