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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef AAPT_PNG_H
#define AAPT_PNG_H
#include <iostream>
#include <string>
#include "android-base/macros.h"
#include "Diagnostics.h"
#include "Source.h"
#include "compile/Image.h"
#include "io/Io.h"
#include "process/IResourceTableConsumer.h"
#include "util/BigBuffer.h"
namespace aapt {
// Size in bytes of the PNG signature.
constexpr size_t kPngSignatureSize = 8u;
struct PngOptions {
int grayscale_tolerance = 0;
};
/**
* Deprecated. Removing once new PNG crunching code is proved to be correct.
*/
class Png {
public:
explicit Png(IDiagnostics* diag) : mDiag(diag) {}
bool process(const Source& source, std::istream* input, BigBuffer* outBuffer,
const PngOptions& options);
private:
DISALLOW_COPY_AND_ASSIGN(Png);
IDiagnostics* mDiag;
};
/**
* An InputStream that filters out unimportant PNG chunks.
*/
class PngChunkFilter : public io::InputStream {
public:
explicit PngChunkFilter(const android::StringPiece& data);
virtual ~PngChunkFilter() = default;
bool Next(const void** buffer, size_t* len) override;
void BackUp(size_t count) override;
bool CanRewind() const override { return true; }
bool Rewind() override;
size_t ByteCount() const override { return window_start_; }
bool HadError() const override {
return !error_msg_.empty();
}
std::string GetError() const override {
return error_msg_;
}
private:
DISALLOW_COPY_AND_ASSIGN(PngChunkFilter);
bool ConsumeWindow(const void** buffer, size_t* len);
android::StringPiece data_;
size_t window_start_ = 0;
size_t window_end_ = 0;
std::string error_msg_;
};
/**
* Reads a PNG from the InputStream into memory as an RGBA Image.
*/
std::unique_ptr<Image> ReadPng(IAaptContext* context, const Source& source, io::InputStream* in);
/**
* Writes the RGBA Image, with optional 9-patch meta-data, into the OutputStream
* as a PNG.
*/
bool WritePng(IAaptContext* context, const Image* image,
const NinePatch* nine_patch, io::OutputStream* out,
const PngOptions& options);
} // namespace aapt
#endif // AAPT_PNG_H
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