skia2/include/core/SkPngChunkReader.h
Mike Klein c0bd9f9fe5 rewrite includes to not need so much -Ifoo
Current strategy: everything from the top

Things to look at first are the manual changes:

   - added tools/rewrite_includes.py
   - removed -Idirectives from BUILD.gn
   - various compile.sh simplifications
   - tweak tools/embed_resources.py
   - update gn/find_headers.py to write paths from the top
   - update gn/gn_to_bp.py SkUserConfig.h layout
     so that #include "include/config/SkUserConfig.h" always
     gets the header we want.

No-Presubmit: true
Change-Id: I73a4b181654e0e38d229bc456c0d0854bae3363e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/209706
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Hal Canary <halcanary@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
2019-04-24 16:27:11 +00:00

46 lines
1.5 KiB
C++

/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkPngChunkReader_DEFINED
#define SkPngChunkReader_DEFINED
#include "include/core/SkRefCnt.h"
#include "include/core/SkTypes.h"
/**
* SkPngChunkReader
*
* Base class for optional callbacks to retrieve meta/chunk data out of a PNG
* encoded image as it is being decoded.
* Used by SkCodec.
*/
class SkPngChunkReader : public SkRefCnt {
public:
/**
* This will be called by the decoder when it sees an unknown chunk.
*
* Use by SkCodec:
* Depending on the location of the unknown chunks, this callback may be
* called by
* - the factory (NewFromStream/NewFromData)
* - getPixels
* - startScanlineDecode
* - the first call to getScanlines/skipScanlines
* The callback may be called from a different thread (e.g. if the SkCodec
* is passed to another thread), and it may be called multiple times, if
* the SkCodec is used multiple times.
*
* @param tag Name for this type of chunk.
* @param data Data to be interpreted by the subclass.
* @param length Number of bytes of data in the chunk.
* @return true to continue decoding, or false to indicate an error, which
* will cause the decoder to not return the image.
*/
virtual bool readChunk(const char tag[], const void* data, size_t length) = 0;
};
#endif // SkPngChunkReader_DEFINED