SkGifDecoder Namespace Reference

Functions
SK_API bool	IsGif (const void *, size_t)
SK_API std::unique_ptr< SkCodec >	Decode (std::unique_ptr< SkStream >, SkCodec::Result *, SkCodecs::DecodeContext=nullptr)
SK_API std::unique_ptr< SkCodec >	Decode (sk_sp< SkData >, SkCodec::Result *, SkCodecs::DecodeContext=nullptr)
constexpr SkCodecs::Decoder	Decoder ()

Function Documentation

Decode() [1/2]

std::unique_ptr< SkCodec > SkGifDecoder::Decode	(	sk_sp< SkData >	data,
		SkCodec::Result *	outResult,
		SkCodecs::DecodeContext	ctx = nullptr
	)

Definition at line 1096 of file SkWuffsCodec.cpp.

                                                           {
    if (!data) {
        if (outResult) {
            *outResult = SkCodec::kInvalidInput;
        }
        return nullptr;
    }
    return Decode(SkMemoryStream::Make(std::move(data)), outResult, ctx);
}

Decode() [2/2]

std::unique_ptr< SkCodec > SkGifDecoder::Decode	(	std::unique_ptr< SkStream >	stream,
		SkCodec::Result *	outResult,
		SkCodecs::DecodeContext	ctx = nullptr
	)

Attempts to decode the given bytes as a GIF.

If the bytes are not a GIF, returns nullptr.

DecodeContext is ignored

Definition at line 1082 of file SkWuffsCodec.cpp.

                                                           {
    SkCodec::Result resultStorage;
    if (!outResult) {
        outResult = &resultStorage;
    }
    auto policy = SkCodec::SelectionPolicy::kPreferStillImage;
    if (ctx) {
        policy = *static_cast<SkCodec::SelectionPolicy*>(ctx);
    }
    return MakeFromStream(std::move(stream), policy, outResult);
}

Decoder()

constexpr SkCodecs::Decoder SkGifDecoder::Decoder ( )

inlineconstexpr

Definition at line 38 of file SkGifDecoder.h.

                                           {
    return { "gif", IsGif, Decode };
}

IsGif()

bool SkGifDecoder::IsGif	(	const void *	buf,
		size_t	bytesRead
	)

Returns true if this data claims to be a GIF image.

Definition at line 977 of file SkWuffsCodec.cpp.

                                              {
    constexpr const char* gif_ptr = "GIF8";
    constexpr size_t      gif_len = 4;
    return (bytesRead >= gif_len) && (memcmp(buf, gif_ptr, gif_len) == 0);
}