a93a14a998
This was created by looking at warnings produced by clang's -Wzero-as-null-pointer-constant. This updates most issues in Skia code. However, there are places where GL and Vulkan want pointer values which are explicitly 0, external headers which use NULL directly, and possibly more uses in un-compiled sources (for other platforms). Change-Id: Id22fbac04d5c53497a53d734f0896b4f06fe8345 Reviewed-on: https://skia-review.googlesource.com/39521 Reviewed-by: Mike Reed <reed@google.com> Commit-Queue: Ben Wagner <bungeman@google.com>
83 lines
2.7 KiB
C++
83 lines
2.7 KiB
C++
/*
|
|
* Copyright 2014 Google Inc.
|
|
*
|
|
* Use of this source code is governed by a BSD-style license that can be
|
|
* found in the LICENSE file.
|
|
*/
|
|
|
|
#ifndef SkDrawable_DEFINED
|
|
#define SkDrawable_DEFINED
|
|
|
|
#include "SkFlattenable.h"
|
|
#include "SkScalar.h"
|
|
|
|
class SkCanvas;
|
|
class SkMatrix;
|
|
class SkPicture;
|
|
struct SkRect;
|
|
|
|
/**
|
|
* Base-class for objects that draw into SkCanvas.
|
|
*
|
|
* The object has a generation ID, which is guaranteed to be unique across all drawables. To
|
|
* allow for clients of the drawable that may want to cache the results, the drawable must
|
|
* change its generation ID whenever its internal state changes such that it will draw differently.
|
|
*/
|
|
class SkDrawable : public SkFlattenable {
|
|
public:
|
|
SkDrawable();
|
|
|
|
/**
|
|
* Draws into the specified content. The drawing sequence will be balanced upon return
|
|
* (i.e. the saveLevel() on the canvas will match what it was when draw() was called,
|
|
* and the current matrix and clip settings will not be changed.
|
|
*/
|
|
void draw(SkCanvas*, const SkMatrix* = nullptr);
|
|
void draw(SkCanvas*, SkScalar x, SkScalar y);
|
|
|
|
SkPicture* newPictureSnapshot();
|
|
|
|
/**
|
|
* Return a unique value for this instance. If two calls to this return the same value,
|
|
* it is presumed that calling the draw() method will render the same thing as well.
|
|
*
|
|
* Subclasses that change their state should call notifyDrawingChanged() to ensure that
|
|
* a new value will be returned the next time it is called.
|
|
*/
|
|
uint32_t getGenerationID();
|
|
|
|
/**
|
|
* Return the (conservative) bounds of what the drawable will draw. If the drawable can
|
|
* change what it draws (e.g. animation or in response to some external change), then this
|
|
* must return a bounds that is always valid for all possible states.
|
|
*/
|
|
SkRect getBounds();
|
|
|
|
/**
|
|
* Calling this invalidates the previous generation ID, and causes a new one to be computed
|
|
* the next time getGenerationID() is called. Typically this is called by the object itself,
|
|
* in response to its internal state changing.
|
|
*/
|
|
void notifyDrawingChanged();
|
|
|
|
SK_DEFINE_FLATTENABLE_TYPE(SkDrawable)
|
|
Factory getFactory() const override { return nullptr; }
|
|
|
|
protected:
|
|
virtual SkRect onGetBounds() = 0;
|
|
virtual void onDraw(SkCanvas*) = 0;
|
|
|
|
/**
|
|
* Default implementation calls onDraw() with a canvas that records into a picture. Subclasses
|
|
* may override if they have a more efficient way to return a picture for the current state
|
|
* of their drawable. Note: this picture must draw the same as what would be drawn from
|
|
* onDraw().
|
|
*/
|
|
virtual SkPicture* onNewPictureSnapshot();
|
|
|
|
private:
|
|
int32_t fGenerationID;
|
|
};
|
|
|
|
#endif
|