06460ef0d7
This also enables an AAPT behavior that CTS tests have come to depend on. Small files that compress negatively (get larger) are stored uncompressed. Some CTS tests assume this and try to open these files by mmapping them, which is only possible if they are uncompressed. Bug: 35461578 Test: make aapt2_tests Change-Id: Id622a6150fe72477ad65d67d1bad897a8ee2ffb9
101 lines
2.5 KiB
C++
101 lines
2.5 KiB
C++
/*
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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 { return error_; }
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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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bool error_ = false;
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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, 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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