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/*
* Copyright (C) 2018 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.
*/
#pragma once
#include <stdio.h>
#include <memory>
#include <string>
#include <png.h>
// This class handles the PNG file parsing. It also holds the ownership of the PNG pointer and the
// opened file pointer. Both will be destroyed / closed when this object goes out of scope.
class PngHandler {
public:
// Constructs an instance by loading the PNG file from '/res/images/<name>.png', or '<name>'.
PngHandler(const std::string& name);
~PngHandler();
png_uint_32 width() const {
return width_;
}
png_uint_32 height() const {
return height_;
}
png_byte channels() const {
return channels_;
}
int bit_depth() const {
return bit_depth_;
}
int color_type() const {
return color_type_;
}
png_structp png_ptr() const {
return png_ptr_;
}
png_infop info_ptr() const {
return info_ptr_;
}
int error_code() const {
return error_code_;
};
operator bool() const {
return error_code_ == 0;
}
private:
png_structp png_ptr_{ nullptr };
png_infop info_ptr_{ nullptr };
png_uint_32 width_;
png_uint_32 height_;
png_byte channels_;
int bit_depth_;
int color_type_;
// The |error_code_| is set to a negative value if an error occurs when opening the png file.
int error_code_{ 0 };
// After initialization, we'll keep the file pointer open before destruction of PngHandler.
std::unique_ptr<FILE, decltype(&fclose)> png_fp_{ nullptr, fclose };
};
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