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// Copyright 2018 Google LLC
//
// 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
//
// https://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.
#ifndef ASTC_CODEC_DECODER_ASTC_FILE_H_
#define ASTC_CODEC_DECODER_ASTC_FILE_H_
#include "src/base/optional.h"
#include "src/decoder/footprint.h"
#include "src/decoder/physical_astc_block.h"
#include <memory>
#include <string>
namespace astc_codec {
// A thin wrapper around a .astc file on disk. This class simply reads the ASTC
// header, and stores the block data in memory.
class ASTCFile {
private:
struct Header {
Header(size_t width, size_t height, size_t depth, size_t block_width,
size_t block_height, size_t block_depth)
: width_(width),
height_(height),
depth_(depth),
block_width_(block_width),
block_height_(block_height),
block_depth_(block_depth) {}
size_t width_;
size_t height_;
size_t depth_;
size_t block_width_;
size_t block_height_;
size_t block_depth_;
};
ASTCFile(ASTCFile::Header&& header, std::string&& blocks);
public:
// Load an ASTC file from memory.
// If loading failed, nullptr is returned and an error string is populated
// in the error parameter.
static std::unique_ptr<ASTCFile> LoadFromMemory(const char* data,
size_t length,
std::string* error);
// Load an ASTC file from file.
// If loading failed, nullptr is returned and an error string is populated
// in the error parameter.
static std::unique_ptr<ASTCFile> LoadFile(const std::string& path,
std::string* error);
// Returns the footprint for the file, if it is considered to be a valid
// footprint.
base::Optional<Footprint> GetFootprint() const;
// Returns the string of the form "NxM" where N and M are the width and height
// of the block footprint, respectively.
std::string GetFootprintString() const;
// Get the raw block data for the astc file.
const std::string& GetRawBlockData() const;
// Returns the physical block at the associated block index.
PhysicalASTCBlock GetBlock(size_t block_idx) const;
size_t GetWidth() const { return header_.width_; }
size_t GetHeight() const { return header_.height_; }
size_t GetDepth() const { return header_.depth_; }
size_t NumBlocks() const {
return blocks_.size() / PhysicalASTCBlock::kSizeInBytes;
}
private:
static base::Optional<ASTCFile::Header> ParseHeader(const char* header);
const Header header_;
const std::string blocks_;
};
} // namespace astc_codec
#endif // ASTC_CODEC_DECODER_ASTC_FILE_H_
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