161 lines
6.8 KiB
C++
161 lines
6.8 KiB
C++
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/*
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* Copyright 2013 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkBitmapDevice_DEFINED
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#define SkBitmapDevice_DEFINED
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#include "SkDevice.h"
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///////////////////////////////////////////////////////////////////////////////
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class SK_API SkBitmapDevice : public SkBaseDevice {
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public:
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SK_DECLARE_INST_COUNT(SkBitmapDevice)
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/**
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* Construct a new device with the specified bitmap as its backend. It is
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* valid for the bitmap to have no pixels associated with it. In that case,
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* any drawing to this device will have no effect.
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*/
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SkBitmapDevice(const SkBitmap& bitmap);
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private:
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/**
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* Construct a new device with the specified bitmap as its backend. It is
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* valid for the bitmap to have no pixels associated with it. In that case,
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* any drawing to this device will have no effect.
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*/
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SkBitmapDevice(const SkBitmap& bitmap, const SkDeviceProperties& deviceProperties);
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static SkBitmapDevice* Create(const SkImageInfo&, const SkDeviceProperties*);
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public:
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static SkBitmapDevice* Create(const SkImageInfo& info) {
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return Create(info, NULL);
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}
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SkImageInfo imageInfo() const SK_OVERRIDE;
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protected:
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bool onShouldDisableLCD(const SkPaint&) const SK_OVERRIDE;
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/** These are called inside the per-device-layer loop for each draw call.
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When these are called, we have already applied any saveLayer operations,
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and are handling any looping from the paint, and any effects from the
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DrawFilter.
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*/
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void drawPaint(const SkDraw&, const SkPaint& paint) SK_OVERRIDE;
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virtual void drawPoints(const SkDraw&, SkCanvas::PointMode mode, size_t count,
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const SkPoint[], const SkPaint& paint) SK_OVERRIDE;
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virtual void drawRect(const SkDraw&, const SkRect& r,
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const SkPaint& paint) SK_OVERRIDE;
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virtual void drawOval(const SkDraw&, const SkRect& oval,
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const SkPaint& paint) SK_OVERRIDE;
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virtual void drawRRect(const SkDraw&, const SkRRect& rr,
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const SkPaint& paint) SK_OVERRIDE;
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/**
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* If pathIsMutable, then the implementation is allowed to cast path to a
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* non-const pointer and modify it in place (as an optimization). Canvas
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* may do this to implement helpers such as drawOval, by placing a temp
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* path on the stack to hold the representation of the oval.
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*
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* If prePathMatrix is not null, it should logically be applied before any
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* stroking or other effects. If there are no effects on the paint that
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* affect the geometry/rasterization, then the pre matrix can just be
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* pre-concated with the current matrix.
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*/
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virtual void drawPath(const SkDraw&, const SkPath& path,
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const SkPaint& paint,
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const SkMatrix* prePathMatrix = NULL,
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bool pathIsMutable = false) SK_OVERRIDE;
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virtual void drawBitmap(const SkDraw&, const SkBitmap& bitmap,
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const SkMatrix& matrix, const SkPaint& paint) SK_OVERRIDE;
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virtual void drawSprite(const SkDraw&, const SkBitmap& bitmap,
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int x, int y, const SkPaint& paint) SK_OVERRIDE;
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/**
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* The default impl. will create a bitmap-shader from the bitmap,
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* and call drawRect with it.
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*/
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virtual void drawBitmapRect(const SkDraw&, const SkBitmap&,
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const SkRect* srcOrNull, const SkRect& dst,
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const SkPaint& paint,
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SkCanvas::DrawBitmapRectFlags flags) SK_OVERRIDE;
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/**
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* Does not handle text decoration.
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* Decorations (underline and stike-thru) will be handled by SkCanvas.
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*/
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virtual void drawText(const SkDraw&, const void* text, size_t len,
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SkScalar x, SkScalar y, const SkPaint& paint) SK_OVERRIDE;
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virtual void drawPosText(const SkDraw&, const void* text, size_t len,
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const SkScalar pos[], int scalarsPerPos,
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const SkPoint& offset, const SkPaint& paint) SK_OVERRIDE;
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virtual void drawVertices(const SkDraw&, SkCanvas::VertexMode, int vertexCount,
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const SkPoint verts[], const SkPoint texs[],
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const SkColor colors[], SkXfermode* xmode,
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const uint16_t indices[], int indexCount,
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const SkPaint& paint) SK_OVERRIDE;
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/** The SkBaseDevice passed will be an SkBaseDevice which was returned by a call to
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onCreateCompatibleDevice on this device with kSaveLayer_Usage.
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*/
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virtual void drawDevice(const SkDraw&, SkBaseDevice*, int x, int y,
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const SkPaint&) SK_OVERRIDE;
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///////////////////////////////////////////////////////////////////////////
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/** Update as needed the pixel value in the bitmap, so that the caller can
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access the pixels directly. Note: only the pixels field should be
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altered. The config/width/height/rowbytes must remain unchanged.
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@return the device contents as a bitmap
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*/
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const SkBitmap& onAccessBitmap() SK_OVERRIDE;
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SkPixelRef* getPixelRef() const { return fBitmap.pixelRef(); }
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// just for subclasses, to assign a custom pixelref
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SkPixelRef* setPixelRef(SkPixelRef* pr) {
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fBitmap.setPixelRef(pr);
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return pr;
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}
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bool onReadPixels(const SkImageInfo&, void*, size_t, int x, int y) SK_OVERRIDE;
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bool onWritePixels(const SkImageInfo&, const void*, size_t, int, int) SK_OVERRIDE;
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void* onAccessPixels(SkImageInfo* info, size_t* rowBytes) SK_OVERRIDE;
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/** Called when this device is installed into a Canvas. Balanced by a call
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to unlockPixels() when the device is removed from a Canvas.
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*/
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void lockPixels() SK_OVERRIDE;
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void unlockPixels() SK_OVERRIDE;
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private:
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friend class SkCanvas;
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friend struct DeviceCM; //for setMatrixClip
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friend class SkDraw;
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friend class SkDrawIter;
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friend class SkDeviceFilteredPaint;
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friend class SkDeviceImageFilterProxy;
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friend class SkSurface_Raster;
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// used to change the backend's pixels (and possibly config/rowbytes)
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// but cannot change the width/height, so there should be no change to
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// any clip information.
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void replaceBitmapBackendForRasterSurface(const SkBitmap&) SK_OVERRIDE;
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SkBaseDevice* onCreateCompatibleDevice(const CreateInfo&) SK_OVERRIDE;
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SkSurface* newSurface(const SkImageInfo&, const SkSurfaceProps&) SK_OVERRIDE;
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const void* peekPixels(SkImageInfo*, size_t* rowBytes) SK_OVERRIDE;
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SkImageFilter::Cache* getImageFilterCache() SK_OVERRIDE;
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SkBitmap fBitmap;
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typedef SkBaseDevice INHERITED;
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};
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#endif // SkBitmapDevice_DEFINED
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