chromium/third_party/blink/renderer/core/paint/nine_piece_image_grid.h

// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_PAINT_NINE_PIECE_IMAGE_GRID_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_PAINT_NINE_PIECE_IMAGE_GRID_H_

#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/layout/geometry/box_sides.h"
#include "third_party/blink/renderer/core/style/nine_piece_image.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/rect_f.h"
#include "ui/gfx/geometry/size.h"
#include "ui/gfx/geometry/size_f.h"

namespace gfx {
class Outsets;
}

namespace blink {

enum NinePiece { … };

inline NinePiece& operator++(NinePiece& piece) { … }

// The NinePieceImageGrid class is responsible for computing drawing information
// for the nine piece image.
//
// https://drafts.csswg.org/css-backgrounds/#border-image-process
//
// Given an image, a set of slices and a border area:
//
//       |         |
//   +---+---------+---+          +------------------+
//   | 1 |    7    | 4 |          |      border      |
// --+---+---------+---+---       |  +------------+  |
//   |   |         |   |          |  |            |  |
//   | 3 |    9    | 6 |          |  |    css     |  |
//   |   |  image  |   |          |  |    box     |  |
//   |   |         |   |          |  |            |  |
// --+---+---------+---+---       |  |            |  |
//   | 2 |    8    | 5 |          |  +------------+  |
//   +---+---------+---+          |                  |
//       |         |              +------------------+
//
// it generates drawing information for the nine border pieces.
class CORE_EXPORT NinePieceImageGrid { … };

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_CORE_PAINT_NINE_PIECE_IMAGE_GRID_H_