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