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