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tile-generator.h
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tile-generator.h
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// Copyright 2021 Ellogon BV.
//
// 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.
#ifndef __TILE_GENERATOR_H_
#define __TILE_GENERATOR_H_
#include <cstddef>
#include <vips/vips.h>
#include <vips/vips8>
#include "utils.h"
using namespace vips;
typedef struct {
Buffer buffer;
unsigned index;
} Tile;
// Lazy loads each tile.
class VipsImageTileGenerator : public Generator<Tile> {
public:
VipsImageTileGenerator(const VImage &source, unsigned tile_width, unsigned tile_height);
virtual std::optional<Tile> Next(
const std::optional<Tile> &prev, bool *end) const final;
const std::optional<Tile> operator[] (unsigned i) const;
private:
const bool ExtractTile(int x, int y, Buffer *out) const;
const VImage &source_;
const unsigned tile_width_;
const unsigned tile_height_;
const unsigned num_tiles_width_;
const unsigned num_total_tiles_;
};
#endif // __TILE_GENERATOR_H_