SkAnimCodecPlayer Class Reference

#include <SkAnimCodecPlayer.h>

Public Member Functions
	SkAnimCodecPlayer (std::unique_ptr< SkCodec > codec)
	~SkAnimCodecPlayer ()
sk_sp< SkImage >	getFrame ()
SkISize	dimensions () const
uint32_t	duration () const
bool	seek (uint32_t msec)

Detailed Description

Definition at line 22 of file SkAnimCodecPlayer.h.

Constructor & Destructor Documentation

SkAnimCodecPlayer()

SkAnimCodecPlayer::SkAnimCodecPlayer

(

std::unique_ptr< SkCodec >

codec

)

Definition at line 32 of file SkAnimCodecPlayer.cpp.

                                                                 : fCodec(std::move(codec)) {
    fImageInfo = fCodec->getInfo();
    fFrameInfos = fCodec->getFrameInfo();
    fImages.resize(fFrameInfos.size());
 
    // change the interpretation of fDuration to a end-time for that frame
    size_t dur = 0;
    for (auto& f : fFrameInfos) {
        dur += f.fDuration;
        f.fDuration = dur;
    }
    fTotalDuration = dur;
 
    if (!fTotalDuration) {
        // Static image -- may or may not have returned a single frame info.
        fFrameInfos.clear();
        fImages.clear();
        fImages.push_back(SkImages::DeferredFromGenerator(
                SkCodecImageGenerator::MakeFromCodec(std::move(fCodec))));
    }
}

~SkAnimCodecPlayer()

SkAnimCodecPlayer::~SkAnimCodecPlayer

(

)

Definition at line 54 of file SkAnimCodecPlayer.cpp.

{}

Member Function Documentation

dimensions()

SkISize SkAnimCodecPlayer::dimensions

(

)

const

Return the size of the image(s) that will be returned by getFrame().

Definition at line 56 of file SkAnimCodecPlayer.cpp.

                                            {
    if (!fCodec) {
        auto image = fImages.front();
        return image ? image->dimensions() : SkISize::MakeEmpty();
    }
    if (SkEncodedOriginSwapsWidthHeight(fCodec->getOrigin())) {
        return { fImageInfo.height(), fImageInfo.width() };
    }
    return { fImageInfo.width(), fImageInfo.height() };
}

duration()

uint32_t SkAnimCodecPlayer::duration ( ) const

inline

Returns the total duration of the animation in milliseconds. Returns 0 for a single-frame image.

Definition at line 43 of file SkAnimCodecPlayer.h.

{ return fTotalDuration; }

getFrame()

sk_sp< SkImage > SkAnimCodecPlayer::getFrame

(

)

Returns the current frame of the animation. This defaults to the first frame for animated codecs (i.e. msec = 0). Calling this multiple times (without calling seek()) will always return the same image object (or null if there was an error).

Definition at line 131 of file SkAnimCodecPlayer.cpp.

                                           {
    SkASSERT(fTotalDuration > 0 || fImages.size() == 1);
 
    return fTotalDuration > 0
        ? this->getFrameAt(fCurrIndex)
        : fImages.front();
}

seek()

bool SkAnimCodecPlayer::seek

(

uint32_t

msec

)

Finds the closest frame associated with the time code (in milliseconds) and sets that to be the current frame (call getFrame() to retrieve that image). Returns true iff this call to seek() changed the "current frame" for the animation. Thus if seek() returns false, then getFrame() will return the same image as it did before this call to seek().

Definition at line 139 of file SkAnimCodecPlayer.cpp.

                                          {
    if (!fTotalDuration) {
        return false;
    }
 
    msec %= fTotalDuration;
 
    auto lower = std::lower_bound(fFrameInfos.begin(), fFrameInfos.end(), msec,
                                  [](const SkCodec::FrameInfo& info, uint32_t msec) {
                                      return (uint32_t)info.fDuration <= msec;
                                  });
    int prevIndex = fCurrIndex;
    fCurrIndex = lower - fFrameInfos.begin();
    return fCurrIndex != prevIndex;
}

---

The documentation for this class was generated from the following files:

• third_party/skia/modules/skresources/src/SkAnimCodecPlayer.h
• third_party/skia/modules/skresources/src/SkAnimCodecPlayer.cpp