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| 1 // Copyright 2016 The Chromium 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 UI_GFX_WIN_RECT_UTIL_H_ | |
| 6 #define UI_GFX_WIN_RECT_UTIL_H_ | |
| 7 | |
| 8 #include <stdint.h> | |
| 9 | |
| 10 #include "ui/gfx/gfx_export.h" | |
| 11 | |
| 12 namespace gfx { | |
| 13 | |
| 14 class Rect; | |
| 15 | |
| 16 namespace win { | |
| 17 | |
| 18 enum class RectEdge { | |
| 19 BOTTOM = 0, | |
| 20 LEFT = 1, | |
| 21 TOP = 2, | |
| 22 RIGHT = 3, | |
| 23 NONE = 4, | |
| 24 }; | |
| 25 | |
| 26 // Returns |ref|'s RectEdge touching |test|. | |
| 27 // Returns RectEdge::NONE if |ref| and |test| do not touch. | |
| 28 // At corners, the bottom corners are clamped to BOTTOM, the upper left corner | |
| 29 // is clamped to LEFT and the upper right corner is clamped to TOP. | |
| 30 GFX_EXPORT RectEdge FindTouchingRectEdge(const gfx::Rect& ref, | |
| 31 const gfx::Rect& test); | |
| 32 | |
| 33 // Returns a scaled and position rect from |unscaled_rect|, positioned against | |
| 34 // |ref_scaled_rect| based off of the original edge positioning on | |
| 35 // |ref_unscaled_rect|, and downscaled by |unscaled_rect_scale_factor|. | |
| 36 // As such, |unscaled_rect| and |ref_unscaled_rect| must be touching rectangles. | |
| 37 // | |
| 38 // Examples: | |
| 39 // Scaled and Unscaled Coordinates | |
| 40 // +--------------+ Since both rectangles are of the same scale | |
| 41 // | | factor, relative positions remain the same. | |
| 42 // | | | |
| 43 // | REF 1x +----------+ | |
| 44 // | | | | |
| 45 // +--------------+ 1x | | |
| 46 // | | | |
| 47 // +----------+ | |
| 48 // | |
| 49 // Unscaled Coordinates | |
| 50 // +--------------+ The 2x rectangle is scaled down while | |
| 51 // | | maintaining a similar neighboring relationship | |
| 52 // | | with the REF 1x rectangle. | |
| 53 // | REF 1x +----------+ | |
| 54 // | | | | |
| 55 // +--------------+ 2x | | |
| 56 // | | | |
| 57 // +----------+ | |
| 58 // Scaled Coordinates | |
| 59 // +--------------+ | |
| 60 // | | | |
| 61 // | | | |
| 62 // | REF 1x | | |
| 63 // | +-----+ | |
| 64 // +--------------+ 2x | | |
| 65 // +-----+ | |
| 66 // | |
| 67 // Unscaled Coordinates | |
| 68 // +--------------+ The reference rectangle has been scaled by 2x | |
| 69 // | | from |ref_unscaled_rect| to |ref_scaled_rect|. | |
| 70 // | | ScaleAndPositionRect maintains the same | |
| 71 // | REF 2x +----------+ relative positioning of the unscaled rect in | |
| 72 // | | | the scaled coordinate space. | |
| 73 // | | | | |
| 74 // | | 1x | | |
| 75 // +--------------+ | | |
| 76 // | | | |
| 77 // +----------+ | |
| 78 // Scaled Coordinates | |
| 79 // +-------+ | |
| 80 // | | | |
| 81 // | REF 2x+----------+ | |
| 82 // | | | | |
| 83 // +-------+ | | |
| 84 // | 1x | | |
| 85 // | | | |
| 86 // | | | |
| 87 // +----------+ | |
| 88 GFX_EXPORT gfx::Rect ScaleAndPositionRect(const gfx::Rect& ref_scaled_rect, | |
| 89 const gfx::Rect& ref_unscaled_rect, | |
| 90 const gfx::Rect& unscaled_rect, | |
| 91 float unscaled_rect_scale_factor); | |
| 92 | |
| 93 // Returns the squared distance between two rects. | |
| 94 // The distance between two rects is the length of the shortest segment that can | |
| 95 // be drawn between two rectangles. This segment generally connects two opposing | |
| 96 // corners between rectangles like this... | |
| 97 // | |
| 98 // +----------+ | |
| 99 // | | | |
| 100 // +----------+ | |
| 101 // \ <--- Shortest Segment | |
| 102 // \ | |
| 103 // +---+ | |
| 104 // | | | |
| 105 // | | | |
| 106 // +---+ | |
| 107 // | |
| 108 // For rectangles that share coordinates within the same axis, that generally | |
| 109 // means the segment is parallel to the axis and perpendicular to the edges. | |
| 110 // | |
| 111 // One of many shortest segments | |
| 112 // +----------+ / \ +--------+ | |
| 113 // | | | \ | | | |
| 114 // | | V +---+ \ +--------+ | |
| 115 // | |-----| | \-->| | |
| 116 // +----------+ | | +----+ | |
| 117 // | | | | | |
| 118 // +---+ +----+ | |
| 119 // | |
| 120 // For rectangles that intersect each other, the distance is 0. | |
| 121 // | |
| 122 // The squared distance is used to avoid taking the square root as the common | |
| 123 // usage is to compare distances greater than 1 unit. | |
| 124 GFX_EXPORT int64_t SquaredDistanceBetweenRects(const gfx::Rect& ref, | |
| 125 const gfx::Rect& rect); | |
| 126 | |
| 127 } // namespace win | |
| 128 } // namespace gfx | |
| 129 | |
| 130 #endif // UI_GFX_WIN_RECT_UTIL_H_ | |
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Issue 1813493002:
COMPLETED PREVIEW Migrate to Display Placement (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@gfxmove