1 /* 2 * Copyright (C) 2011-2013 Intel Corporation 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice (including the next 12 * paragraph) shall be included in all copies or substantial portions of the 13 * Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 * SOFTWARE. 22 */ 23 24 #ifndef DRM_RECT_H 25 #define DRM_RECT_H 26 27 /** 28 * drm_rect - two dimensional rectangle 29 * @x1: horizontal starting coordinate (inclusive) 30 * @x2: horizontal ending coordinate (exclusive) 31 * @y1: vertical starting coordinate (inclusive) 32 * @y2: vertical ending coordinate (exclusive) 33 */ 34 struct drm_rect { 35 int x1, y1, x2, y2; 36 }; 37 38 /** 39 * drm_rect_adjust_size - adjust the size of the rectangle 40 * @r: rectangle to be adjusted 41 * @dw: horizontal adjustment 42 * @dh: vertical adjustment 43 * 44 * Change the size of rectangle @r by @dw in the horizontal direction, 45 * and by @dh in the vertical direction, while keeping the center 46 * of @r stationary. 47 * 48 * Positive @dw and @dh increase the size, negative values decrease it. 49 */ 50 static inline void drm_rect_adjust_size(struct drm_rect *r, int dw, int dh) 51 { 52 r->x1 -= dw >> 1; 53 r->y1 -= dh >> 1; 54 r->x2 += (dw + 1) >> 1; 55 r->y2 += (dh + 1) >> 1; 56 } 57 58 /** 59 * drm_rect_translate - translate the rectangle 60 * @r: rectangle to be tranlated 61 * @dx: horizontal translation 62 * @dy: vertical translation 63 * 64 * Move rectangle @r by @dx in the horizontal direction, 65 * and by @dy in the vertical direction. 66 */ 67 static inline void drm_rect_translate(struct drm_rect *r, int dx, int dy) 68 { 69 r->x1 += dx; 70 r->y1 += dy; 71 r->x2 += dx; 72 r->y2 += dy; 73 } 74 75 /** 76 * drm_rect_downscale - downscale a rectangle 77 * @r: rectangle to be downscaled 78 * @horz: horizontal downscale factor 79 * @vert: vertical downscale factor 80 * 81 * Divide the coordinates of rectangle @r by @horz and @vert. 82 */ 83 static inline void drm_rect_downscale(struct drm_rect *r, int horz, int vert) 84 { 85 r->x1 /= horz; 86 r->y1 /= vert; 87 r->x2 /= horz; 88 r->y2 /= vert; 89 } 90 91 /** 92 * drm_rect_width - determine the rectangle width 93 * @r: rectangle whose width is returned 94 * 95 * RETURNS: 96 * The width of the rectangle. 97 */ 98 static inline int drm_rect_width(const struct drm_rect *r) 99 { 100 return r->x2 - r->x1; 101 } 102 103 /** 104 * drm_rect_height - determine the rectangle height 105 * @r: rectangle whose height is returned 106 * 107 * RETURNS: 108 * The height of the rectangle. 109 */ 110 static inline int drm_rect_height(const struct drm_rect *r) 111 { 112 return r->y2 - r->y1; 113 } 114 115 /** 116 * drm_rect_visible - determine if the the rectangle is visible 117 * @r: rectangle whose visibility is returned 118 * 119 * RETURNS: 120 * %true if the rectangle is visible, %false otherwise. 121 */ 122 static inline bool drm_rect_visible(const struct drm_rect *r) 123 { 124 return drm_rect_width(r) > 0 && drm_rect_height(r) > 0; 125 } 126 127 bool drm_rect_intersect(struct drm_rect *r, const struct drm_rect *clip); 128 bool drm_rect_clip_scaled(struct drm_rect *src, struct drm_rect *dst, 129 const struct drm_rect *clip, 130 int hscale, int vscale); 131 int drm_rect_calc_hscale(const struct drm_rect *src, 132 const struct drm_rect *dst, 133 int min_hscale, int max_hscale); 134 int drm_rect_calc_vscale(const struct drm_rect *src, 135 const struct drm_rect *dst, 136 int min_vscale, int max_vscale); 137 int drm_rect_calc_hscale_relaxed(struct drm_rect *src, 138 struct drm_rect *dst, 139 int min_hscale, int max_hscale); 140 int drm_rect_calc_vscale_relaxed(struct drm_rect *src, 141 struct drm_rect *dst, 142 int min_vscale, int max_vscale); 143 144 #endif 145