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rectangle_packer.h
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1 // Copyright 2013 The Flutter Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #ifndef FLUTTER_IMPELLER_TYPOGRAPHER_RECTANGLE_PACKER_H_
6 #define FLUTTER_IMPELLER_TYPOGRAPHER_RECTANGLE_PACKER_H_
7
8 #include "flutter/fml/logging.h"
9
10 #include <cstdint>
11
12 namespace impeller {
13
14 struct IPoint16 {
15 int16_t x() const { return x_; }
16 int16_t y() const { return y_; }
17
18 int16_t x_;
19 int16_t y_;
20 };
21
22 //------------------------------------------------------------------------------
23 /// @brief Packs rectangles into a specified area without rotating them.
24 ///
25 class RectanglePacker {
26 public:
27 //----------------------------------------------------------------------------
28 /// @brief Return an empty packer with area specified by width and height.
29 ///
30 static RectanglePacker* Factory(int width, int height);
31
32 virtual ~RectanglePacker() {}
33
34 //----------------------------------------------------------------------------
35 /// @brief Attempt to add a rect without moving already placed rectangles.
36 ///
37 /// @param[in] width The width of the rectangle to add.
38 /// @param[in] height The height of the rectangle to add.
39 /// @param[out] loc If successful, will be set to the position of the
40 /// upper-left corner of the rectangle.
41 ///
42 /// @return Return true on success; false on failure.
43 ///
44 virtual bool addRect(int width, int height, IPoint16* loc) = 0;
45
46 //----------------------------------------------------------------------------
47 /// @brief Returns how much area has been filled with rectangles.
48 ///
49 /// @return Percentage as a decimal between 0.0 and 1.0
50 ///
51 virtual float percentFull() const = 0;
52
53 //----------------------------------------------------------------------------
54 /// @brief Empty out all previously added rectangles.
55 ///
56 virtual void reset() = 0;
57
58 protected:
59 RectanglePacker(int width, int height) : width_(width), height_(height) {
60 FML_DCHECK(width >= 0);
61 FML_DCHECK(height >= 0);
62 }
63
64 int width() const { return width_; }
65 int height() const { return height_; }
66
67 private:
68 const int width_;
69 const int height_;
70 };
71
72 } // namespace impeller
73
74 #endif // FLUTTER_IMPELLER_TYPOGRAPHER_RECTANGLE_PACKER_H_
impeller::RectanglePacker::width
int width() const
Definition: rectangle_packer.h:64
impeller::RectanglePacker::percentFull
virtual float percentFull() const =0
Returns how much area has been filled with rectangles.
impeller::IPoint16::x
int16_t x() const
Definition: rectangle_packer.h:15
impeller::IPoint16::y
int16_t y() const
Definition: rectangle_packer.h:16
impeller::RectanglePacker
Packs rectangles into a specified area without rotating them.
Definition: rectangle_packer.h:25
impeller::RectanglePacker::addRect
virtual bool addRect(int width, int height, IPoint16 *loc)=0
Attempt to add a rect without moving already placed rectangles.
impeller::RectanglePacker::height
int height() const
Definition: rectangle_packer.h:65
impeller::IPoint16::x_
int16_t x_
Definition: rectangle_packer.h:18
impeller::RectanglePacker::RectanglePacker
RectanglePacker(int width, int height)
Definition: rectangle_packer.h:59
impeller::IPoint16::y_
int16_t y_
Definition: rectangle_packer.h:19
impeller::RectanglePacker::Factory
static RectanglePacker * Factory(int width, int height)
Return an empty packer with area specified by width and height.
Definition: rectangle_packer.cc:169
impeller::RectanglePacker::~RectanglePacker
virtual ~RectanglePacker()
Definition: rectangle_packer.h:32
impeller::IPoint16
Definition: rectangle_packer.h:14
impeller::RectanglePacker::reset
virtual void reset()=0
Empty out all previously added rectangles.
impeller
Definition: aiks_context.cc:10