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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkCodec.h"
#include "SkData.h"
#include "SkCodec_libbmp.h"
#include "SkCodec_libpng.h"
#include "SkStream.h"
struct DecoderProc {
bool (*IsFormat)(SkStream*);
SkCodec* (*NewFromStream)(SkStream*);
};
static const DecoderProc gDecoderProcs[] = {
{ SkPngCodec::IsPng, SkPngCodec::NewFromStream },
{ SkBmpCodec::IsBmp, SkBmpCodec::NewFromStream }
};
SkCodec* SkCodec::NewFromStream(SkStream* stream) {
if (!stream) {
return NULL;
}
for (uint32_t i = 0; i < SK_ARRAY_COUNT(gDecoderProcs); i++) {
DecoderProc proc = gDecoderProcs[i];
const bool correctFormat = proc.IsFormat(stream);
if (!stream->rewind()) {
return NULL;
}
if (correctFormat) {
return proc.NewFromStream(stream);
}
}
return NULL;
}
SkCodec* SkCodec::NewFromData(SkData* data) {
if (!data) {
return NULL;
}
return NewFromStream(SkNEW_ARGS(SkMemoryStream, (data)));
}
SkCodec::SkCodec(const SkImageInfo& info, SkStream* stream)
: INHERITED(info)
, fInfo(info)
, fStream(stream)
, fNeedsRewind(false)
{}
bool SkCodec::rewindIfNeeded() {
// Store the value of fNeedsRewind so we can update it. Next read will
// require a rewind.
const bool neededRewind = fNeedsRewind;
fNeedsRewind = true;
return !neededRewind || fStream->rewind();
}
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