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/*
* Copyright 2017 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkFrameHolder_DEFINED
#define SkFrameHolder_DEFINED
#include "SkTypes.h"
#include "SkCodecAnimation.h"
/**
* Base class for a single frame of an animated image.
*
* Separate from SkCodec::FrameInfo, which is a pared down
* interface that only contains the info the client needs.
*/
class SkFrame : public SkNoncopyable {
public:
SkFrame(int id)
: fId(id)
, fHasAlpha(false)
, fRequiredFrame(kUninitialized)
, fDisposalMethod(SkCodecAnimation::Keep_DisposalMethod)
, fDuration(0)
, fBlend(SkCodecAnimation::Blend::kPriorFrame)
{
fRect.setEmpty();
}
virtual ~SkFrame() {}
/**
* 0-based index of the frame in the image sequence.
*/
int frameId() const { return fId; }
/**
* Whether this frame reports alpha.
*
* This only considers the rectangle of this frame, and
* considers it to have alpha even if it is opaque once
* blended with the frame behind it.
*/
bool reportsAlpha() const {
return this->onReportsAlpha();
}
/**
* Cached value representing whether the frame has alpha,
* after compositing with the prior frame.
*/
bool hasAlpha() const { return fHasAlpha; }
/**
* Cache whether the finished frame has alpha.
*/
void setHasAlpha(bool alpha) { fHasAlpha = alpha; }
/**
* Whether enough of the frame has been read to determine
* fRequiredFrame and fHasAlpha.
*/
bool reachedStartOfData() const { return fRequiredFrame != kUninitialized; }
/**
* The frame this one depends on.
*
* Must not be called until fRequiredFrame has been set properly.
*/
int getRequiredFrame() const {
SkASSERT(this->reachedStartOfData());
return fRequiredFrame;
}
/**
* Set the frame that this frame depends on.
*/
void setRequiredFrame(int req) { fRequiredFrame = req; }
/**
* Set the rectangle that is updated by this frame.
*/
void setXYWH(int x, int y, int width, int height) {
fRect.setXYWH(x, y, width, height);
}
/**
* The rectangle that is updated by this frame.
*/
SkIRect frameRect() const { return fRect; }
int xOffset() const { return fRect.x(); }
int yOffset() const { return fRect.y(); }
int width() const { return fRect.width(); }
int height() const { return fRect.height(); }
SkCodecAnimation::DisposalMethod getDisposalMethod() const {
return fDisposalMethod;
}
void setDisposalMethod(SkCodecAnimation::DisposalMethod disposalMethod) {
fDisposalMethod = disposalMethod;
}
/**
* Set the duration (in ms) to show this frame.
*/
void setDuration(int duration) {
fDuration = duration;
}
/**
* Duration in ms to show this frame.
*/
int getDuration() const {
return fDuration;
}
void setBlend(SkCodecAnimation::Blend blend) {
fBlend = blend;
}
SkCodecAnimation::Blend getBlend() const {
return fBlend;
}
protected:
virtual bool onReportsAlpha() const = 0;
private:
static constexpr int kUninitialized = -2;
const int fId;
bool fHasAlpha;
int fRequiredFrame;
SkIRect fRect;
SkCodecAnimation::DisposalMethod fDisposalMethod;
int fDuration;
SkCodecAnimation::Blend fBlend;
};
/**
* Base class for an object which holds the SkFrames of an
* image sequence.
*/
class SkFrameHolder : public SkNoncopyable {
public:
SkFrameHolder()
: fScreenWidth(0)
, fScreenHeight(0)
{}
virtual ~SkFrameHolder() {}
/**
* Size of the image. Each frame will be contained in
* these dimensions (possibly after clipping).
*/
int screenWidth() const { return fScreenWidth; }
int screenHeight() const { return fScreenHeight; }
/**
* Compute the opacity and required frame, based on
* whether the frame reportsAlpha and how it blends
* with prior frames.
*/
void setAlphaAndRequiredFrame(SkFrame*);
/**
* Return the frame with frameId i.
*/
const SkFrame* getFrame(int i) const {
return this->onGetFrame(i);
}
protected:
int fScreenWidth;
int fScreenHeight;
virtual const SkFrame* onGetFrame(int i) const = 0;
};
#endif // SkFrameHolder_DEFINED
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