| /* |
| * 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_libico.h" |
| #include "SkCodec_libpng.h" |
| #include "SkCodec_wbmp.h" |
| #include "SkStream.h" |
| |
| struct DecoderProc { |
| bool (*IsFormat)(SkStream*); |
| SkCodec* (*NewFromStream)(SkStream*); |
| }; |
| |
| static const DecoderProc gDecoderProcs[] = { |
| { SkPngCodec::IsPng, SkPngCodec::NewFromStream }, |
| { SkIcoCodec::IsIco, SkIcoCodec::NewFromStream }, |
| { SkBmpCodec::IsBmp, SkBmpCodec::NewFromStream }, |
| { SkWbmpCodec::IsWbmp, SkWbmpCodec::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) |
| #ifdef SK_SUPPORT_LEGACY_BOOL_ONGETINFO |
| , fInfo(info) |
| #endif |
| , fStream(stream) |
| , fNeedsRewind(false) |
| {} |
| |
| SkCodec::RewindState SkCodec::rewindIfNeeded() { |
| // Store the value of fNeedsRewind so we can update it. Next read will |
| // require a rewind. |
| const bool needsRewind = fNeedsRewind; |
| fNeedsRewind = true; |
| if (!needsRewind) { |
| return kNoRewindNecessary_RewindState; |
| } |
| return fStream->rewind() ? kRewound_RewindState |
| : kCouldNotRewind_RewindState; |
| } |
| |
| SkScanlineDecoder* SkCodec::getScanlineDecoder(const SkImageInfo& dstInfo) { |
| fScanlineDecoder.reset(NULL); |
| if (!rewindIfNeeded()) { |
| return NULL; |
| } |
| fScanlineDecoder.reset(this->onGetScanlineDecoder(dstInfo)); |
| return fScanlineDecoder.get(); |
| } |