Png.h revision ce5e56e243d262a9b65459c3bd0bb9eaadd40628
1/* 2 * Copyright (C) 2015 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#ifndef AAPT_PNG_H 18#define AAPT_PNG_H 19 20#include <iostream> 21#include <string> 22 23#include "android-base/macros.h" 24 25#include "Diagnostics.h" 26#include "Source.h" 27#include "compile/Image.h" 28#include "io/Io.h" 29#include "process/IResourceTableConsumer.h" 30#include "util/BigBuffer.h" 31 32namespace aapt { 33 34struct PngOptions { 35 int grayscale_tolerance = 0; 36}; 37 38/** 39 * Deprecated. Removing once new PNG crunching code is proved to be correct. 40 */ 41class Png { 42 public: 43 explicit Png(IDiagnostics* diag) : mDiag(diag) {} 44 45 bool process(const Source& source, std::istream* input, BigBuffer* outBuffer, 46 const PngOptions& options); 47 48 private: 49 IDiagnostics* mDiag; 50 51 DISALLOW_COPY_AND_ASSIGN(Png); 52}; 53 54/** 55 * An InputStream that filters out unimportant PNG chunks. 56 */ 57class PngChunkFilter : public io::InputStream { 58 public: 59 explicit PngChunkFilter(const StringPiece& data); 60 61 bool Next(const void** buffer, int* len) override; 62 void BackUp(int count) override; 63 bool Skip(int count) override; 64 65 int64_t ByteCount() const override { 66 return static_cast<int64_t>(window_start_); 67 } 68 69 bool HadError() const override { return error_; } 70 71 private: 72 bool ConsumeWindow(const void** buffer, int* len); 73 74 StringPiece data_; 75 size_t window_start_ = 0; 76 size_t window_end_ = 0; 77 bool error_ = false; 78 79 DISALLOW_COPY_AND_ASSIGN(PngChunkFilter); 80}; 81 82/** 83 * Reads a PNG from the InputStream into memory as an RGBA Image. 84 */ 85std::unique_ptr<Image> ReadPng(IAaptContext* context, io::InputStream* in); 86 87/** 88 * Writes the RGBA Image, with optional 9-patch meta-data, into the OutputStream 89 * as a PNG. 90 */ 91bool WritePng(IAaptContext* context, const Image* image, 92 const NinePatch* nine_patch, io::OutputStream* out, 93 const PngOptions& options); 94 95} // namespace aapt 96 97#endif // AAPT_PNG_H 98