| /* |
| * 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 SkDevice; |
| class SkDraw; |
| struct SkIRect; |
| class SkMatrix; |
| 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 SkDeviceFactory { |
| public: |
| virtual ~SkDeviceFactory(); |
| virtual SkDevice* newDevice(SkBitmap::Config config, int width, int height, |
| bool isOpaque, bool isForLayer) = 0; |
| }; |
| |
| class SkRasterDeviceFactory : public SkDeviceFactory { |
| public: |
| virtual SkDevice* newDevice(SkBitmap::Config config, int width, int height, |
| bool isOpaque, bool isForLayer); |
| }; |
| |
| class SkDevice : public SkRefCnt { |
| public: |
| SkDevice(); |
| /** Construct a new device, extracting the width/height/config/isOpaque |
| values from 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(const SkBitmap& bitmap); |
| |
| virtual SkDeviceFactory* getDeviceFactory() { |
| return SkNEW(SkRasterDeviceFactory); |
| } |
| |
| 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). |
| */ |
| int width() const { return fBitmap.width(); } |
| /** Return the height of the device (in pixels). |
| */ |
| int height() const { return fBitmap.height(); } |
| /** 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); |
| |
| /** Helper to erase the entire device to the specified color (including |
| alpha). |
| */ |
| void eraseColor(SkColor 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(); |
| |
| /** 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. |
| */ |
| virtual void setMatrixClip(const SkMatrix&, const SkRegion&); |
| |
| /** Called when this device gains focus (i.e becomes the current device |
| for drawing). |
| */ |
| virtual void gainFocus(SkCanvas*) {} |
| |
| /** 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); |
| virtual void drawPath(const SkDraw&, const SkPath& path, |
| const SkPaint& paint); |
| virtual void drawBitmap(const SkDraw&, const SkBitmap& bitmap, |
| 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); |
| virtual void drawPosTextOnPath(const SkDraw& draw, const void* text, size_t len, |
| const SkPoint pos[], const SkPaint& paint, |
| const SkPath& path, const SkMatrix* matrix); |
| 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&); |
| |
| protected: |
| /** 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*); |
| |
| private: |
| SkBitmap fBitmap; |
| }; |
| |
| #endif |