| /* |
| * Copyright (C) 2010 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef SkDevice_DEFINED |
| #define SkDevice_DEFINED |
| |
| #include "SkRefCnt.h" |
| #include "SkBitmap.h" |
| #include "SkCanvas.h" |
| #include "SkColor.h" |
| |
| class SkClipStack; |
| class SkDevice; |
| class SkDraw; |
| struct SkIRect; |
| class SkMatrix; |
| class SkMetaData; |
| class SkRegion; |
| |
| /** \class SkDeviceFactory |
| |
| Devices that extend SkDevice should also provide a SkDeviceFactory class |
| to pass into SkCanvas. Doing so will eliminate the need to extend |
| SkCanvas as well. |
| */ |
| class SK_API SkDeviceFactory : public SkRefCnt { |
| public: |
| SkDeviceFactory(); |
| virtual ~SkDeviceFactory(); |
| virtual SkDevice* newDevice(SkCanvas*, SkBitmap::Config, int width, |
| int height, bool isOpaque, bool isLayer) = 0; |
| }; |
| |
| class SkRasterDeviceFactory : public SkDeviceFactory { |
| public: |
| virtual SkDevice* newDevice(SkCanvas*, SkBitmap::Config, int width, |
| int height, bool isOpaque, bool isLayer); |
| }; |
| |
| class SK_API SkDevice : public SkRefCnt { |
| public: |
| SkDevice(SkCanvas*); |
| /** Construct a new device, extracting the width/height/config/isOpaque values from |
| the bitmap. If transferPixelOwnership is true, and the bitmap claims to own its |
| own pixels (getOwnsPixels() == true), then transfer this responsibility to the |
| device, and call setOwnsPixels(false) on the bitmap. |
| |
| Subclasses may override the destructor, which is virtual, even though this class |
| doesn't have one. SkRefCnt does. |
| |
| @param bitmap A copy of this bitmap is made and stored in the device |
| */ |
| SkDevice(SkCanvas*, const SkBitmap& bitmap, bool forOffscreen); |
| virtual ~SkDevice(); |
| |
| /** |
| * Return the factory that will create this subclass of SkDevice. |
| * The returned factory is cached by the device, and so its reference count |
| * is not changed by this call. |
| */ |
| SkDeviceFactory* getDeviceFactory(); |
| |
| enum Capabilities { |
| kGL_Capability = 0x1, //!< mask indicating GL support |
| kVector_Capability = 0x2, //!< mask indicating a vector representation |
| kAll_Capabilities = 0x3 |
| }; |
| virtual uint32_t getDeviceCapabilities() { return 0; } |
| |
| /** Return the width of the device (in pixels). |
| */ |
| virtual int width() const { return fBitmap.width(); } |
| /** Return the height of the device (in pixels). |
| */ |
| virtual int height() const { return fBitmap.height(); } |
| |
| /** |
| * Return the device's origin: its offset in device coordinates from |
| * the default origin in its canvas' matrix/clip |
| */ |
| const SkIPoint& getOrigin() const { return fOrigin; } |
| |
| /** Return the bitmap config of the device's pixels |
| */ |
| SkBitmap::Config config() const { return fBitmap.getConfig(); } |
| /** Returns true if the device's bitmap's config treats every pixels as |
| implicitly opaque. |
| */ |
| bool isOpaque() const { return fBitmap.isOpaque(); } |
| |
| /** Return the bounds of the device |
| */ |
| void getBounds(SkIRect* bounds) const; |
| |
| /** Return true if the specified rectangle intersects the bounds of the |
| device. If sect is not NULL and there is an intersection, sect returns |
| the intersection. |
| */ |
| bool intersects(const SkIRect& r, SkIRect* sect = NULL) const; |
| |
| /** Return the bitmap associated with this device. Call this each time you need |
| to access the bitmap, as it notifies the subclass to perform any flushing |
| etc. before you examine the pixels. |
| @param changePixels set to true if the caller plans to change the pixels |
| @return the device's bitmap |
| */ |
| const SkBitmap& accessBitmap(bool changePixels); |
| |
| /** Clears the entire device to the specified color (including alpha). |
| * Ignores the clip. |
| */ |
| virtual void clear(SkColor color); |
| |
| /** |
| * Deprecated name for clear. |
| */ |
| void eraseColor(SkColor eraseColor) { this->clear(eraseColor); } |
| |
| /** Called when this device is installed into a Canvas. Balanaced by a call |
| to unlockPixels() when the device is removed from a Canvas. |
| */ |
| virtual void lockPixels(); |
| virtual void unlockPixels(); |
| |
| /** Return the device's associated texture, or NULL. If returned, it may be |
| drawn into another device |
| */ |
| virtual SkGpuTexture* accessTexture() { return NULL; } |
| |
| /** |
| * Called with the correct matrix and clip before this device is drawn |
| * to using those settings. If your subclass overrides this, be sure to |
| * call through to the base class as well. |
| * |
| * The clipstack is another view of the clip. It records the actual |
| * geometry that went into building the region. It is present for devices |
| * that want to parse it, but is not required: the region is a complete |
| * picture of the current clip. (i.e. if you regionize all of the geometry |
| * in the clipstack, you will arrive at an equivalent region to the one |
| * passed in). |
| */ |
| virtual void setMatrixClip(const SkMatrix&, const SkRegion&, |
| const SkClipStack&); |
| |
| /** Called when this device gains focus (i.e becomes the current device |
| for drawing). |
| */ |
| virtual void gainFocus(SkCanvas*, const SkMatrix&, const SkRegion&, |
| const SkClipStack&) {} |
| |
| /** Causes any deferred drawing to the device to be completed. |
| */ |
| virtual void flush() {} |
| |
| /** |
| * Copy the pixels from the device into bitmap. Returns true on success. |
| * If false is returned, then the bitmap parameter is left unchanged. |
| * The bitmap parameter is treated as output-only, and will be completely |
| * overwritten (if the method returns true). |
| */ |
| virtual bool readPixels(const SkIRect& srcRect, SkBitmap* bitmap); |
| |
| /** |
| * Similar to draw sprite, this method will copy the pixels in bitmap onto |
| * the device, with the top/left corner specified by (x, y). The pixel |
| * values in the device are completely replaced: there is no blending. |
| */ |
| virtual void writePixels(const SkBitmap& bitmap, int x, int y); |
| |
| /** These are called inside the per-device-layer loop for each draw call. |
| When these are called, we have already applied any saveLayer operations, |
| and are handling any looping from the paint, and any effects from the |
| DrawFilter. |
| */ |
| virtual void drawPaint(const SkDraw&, const SkPaint& paint); |
| virtual void drawPoints(const SkDraw&, SkCanvas::PointMode mode, size_t count, |
| const SkPoint[], const SkPaint& paint); |
| virtual void drawRect(const SkDraw&, const SkRect& r, |
| const SkPaint& paint); |
| /** |
| * If pathIsMutable, then the implementation is allowed to cast path to a |
| * non-const pointer and modify it in place (as an optimization). Canvas |
| * may do this to implement helpers such as drawOval, by placing a temp |
| * path on the stack to hold the representation of the oval. |
| * |
| * If prePathMatrix is not null, it should logically be applied before any |
| * stroking or other effects. If there are no effects on the paint that |
| * affect the geometry/rasterization, then the pre matrix can just be |
| * pre-concated with the current matrix. |
| */ |
| virtual void drawPath(const SkDraw&, const SkPath& path, |
| const SkPaint& paint, |
| const SkMatrix* prePathMatrix = NULL, |
| bool pathIsMutable = false); |
| virtual void drawBitmap(const SkDraw&, const SkBitmap& bitmap, |
| const SkIRect* srcRectOrNull, |
| const SkMatrix& matrix, const SkPaint& paint); |
| virtual void drawSprite(const SkDraw&, const SkBitmap& bitmap, |
| int x, int y, const SkPaint& paint); |
| virtual void drawText(const SkDraw&, const void* text, size_t len, |
| SkScalar x, SkScalar y, const SkPaint& paint); |
| virtual void drawPosText(const SkDraw&, const void* text, size_t len, |
| const SkScalar pos[], SkScalar constY, |
| int scalarsPerPos, const SkPaint& paint); |
| virtual void drawTextOnPath(const SkDraw&, const void* text, size_t len, |
| const SkPath& path, const SkMatrix* matrix, |
| const SkPaint& paint); |
| #ifdef ANDROID |
| virtual void drawPosTextOnPath(const SkDraw& draw, const void* text, size_t len, |
| const SkPoint pos[], const SkPaint& paint, |
| const SkPath& path, const SkMatrix* matrix); |
| #endif |
| virtual void drawVertices(const SkDraw&, SkCanvas::VertexMode, int vertexCount, |
| const SkPoint verts[], const SkPoint texs[], |
| const SkColor colors[], SkXfermode* xmode, |
| const uint16_t indices[], int indexCount, |
| const SkPaint& paint); |
| virtual void drawDevice(const SkDraw&, SkDevice*, int x, int y, |
| const SkPaint&); |
| |
| /////////////////////////////////////////////////////////////////////////// |
| |
| SkMetaData& getMetaData(); |
| |
| struct TextFlags { |
| uint32_t fFlags; // SkPaint::getFlags() |
| SkPaint::Hinting fHinting; |
| }; |
| |
| /** |
| * Device may filter the text flags for drawing text here. If it wants to |
| * make a change to the specified values, it should write them into the |
| * textflags parameter (output) and return true. If the paint is fine as |
| * is, then ignore the textflags parameter and return false. |
| * |
| * The baseclass SkDevice filters based on its depth and blitters. |
| */ |
| virtual bool filterTextFlags(const SkPaint& paint, TextFlags*); |
| |
| protected: |
| /** |
| * subclasses must override this to return a new (or ref'd) instance of |
| * a device factory that will create this subclass of device. This value |
| * is cached, so it should get called at most once for a given instance. |
| */ |
| virtual SkDeviceFactory* onNewDeviceFactory(); |
| |
| /** Update as needed the pixel value in the bitmap, so that the caller can access |
| the pixels directly. Note: only the pixels field should be altered. The config/width/height/rowbytes |
| must remain unchanged. |
| */ |
| virtual void onAccessBitmap(SkBitmap*); |
| |
| SkPixelRef* getPixelRef() const { return fBitmap.pixelRef(); } |
| // just for subclasses, to assign a custom pixelref |
| SkPixelRef* setPixelRef(SkPixelRef* pr, size_t offset) { |
| fBitmap.setPixelRef(pr, offset); |
| return pr; |
| } |
| |
| private: |
| friend class SkCanvas; |
| // just called by SkCanvas when built as a layer |
| void setOrigin(int x, int y) { fOrigin.set(x, y); } |
| |
| SkCanvas* fCanvas; |
| SkBitmap fBitmap; |
| SkIPoint fOrigin; |
| SkMetaData* fMetaData; |
| |
| SkDeviceFactory* fCachedDeviceFactory; |
| }; |
| |
| #endif |