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/*
* Copyright 2013 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkErrorInternals.h"
#include "SkImageDecoder.h"
#include "SkStream.h"
#include "SkTRegistry.h"
// This file is used for registration of SkImageDecoders. It also holds a function
// for checking all the the registered SkImageDecoders for one that matches an
// input SkStreamRewindable.
template SkImageDecoder_DecodeReg* SkImageDecoder_DecodeReg::gHead;
SkImageDecoder* image_decoder_from_stream(SkStreamRewindable*);
SkImageDecoder* image_decoder_from_stream(SkStreamRewindable* stream) {
SkImageDecoder* codec = nullptr;
const SkImageDecoder_DecodeReg* curr = SkImageDecoder_DecodeReg::Head();
while (curr) {
codec = curr->factory()(stream);
// we rewind here, because we promise later when we call "decode", that
// the stream will be at its beginning.
bool rewindSuceeded = stream->rewind();
// our image decoder's require that rewind is supported so we fail early
// if we are given a stream that does not support rewinding.
if (!rewindSuceeded) {
SkDEBUGF(("Unable to rewind the image stream."));
delete codec;
return nullptr;
}
if (codec) {
return codec;
}
curr = curr->next();
}
return nullptr;
}
template SkImageDecoder_FormatReg* SkImageDecoder_FormatReg::gHead;
SkImageDecoder::Format SkImageDecoder::GetStreamFormat(SkStreamRewindable* stream) {
const SkImageDecoder_FormatReg* curr = SkImageDecoder_FormatReg::Head();
while (curr != nullptr) {
Format format = curr->factory()(stream);
if (!stream->rewind()) {
SkErrorInternals::SetError(kInvalidOperation_SkError,
"Unable to rewind the image stream\n");
return kUnknown_Format;
}
if (format != kUnknown_Format) {
return format;
}
curr = curr->next();
}
return kUnknown_Format;
}
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