Atlas - SDL_rect.c
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[FILE BEGIN]
1/*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2025 Sam Lantinga <[email protected]>
4
5  This software is provided 'as-is', without any express or implied
6  warranty.  In no event will the authors be held liable for any damages
7  arising from the use of this software.
8
9  Permission is granted to anyone to use this software for any purpose,
10  including commercial applications, and to alter it and redistribute it
11  freely, subject to the following restrictions:
12
13  1. The origin of this software must not be misrepresented; you must not
14     claim that you wrote the original software. If you use this software
15     in a product, an acknowledgment in the product documentation would be
16     appreciated but is not required.
17  2. Altered source versions must be plainly marked as such, and must not be
18     misrepresented as being the original software.
19  3. This notice may not be removed or altered from any source distribution.
20*/
21#include "SDL_internal.h"
22
23#include "SDL_rect_c.h"
24
25/* There's no float version of this at the moment, because it's not a public API
26   and internally we only need the int version. */
27bool SDL_GetSpanEnclosingRect(int width, int height,
28                         int numrects, const SDL_Rect *rects, SDL_Rect *span)
29{
30    int i;
31    int span_y1, span_y2;
32    int rect_y1, rect_y2;
33
34    CHECK_PARAM(width < 1) {
35        SDL_InvalidParamError("width");
36        return false;
37    }
38    CHECK_PARAM(height < 1) {
39        SDL_InvalidParamError("height");
40        return false;
41    }
42    CHECK_PARAM(!rects) {
43        SDL_InvalidParamError("rects");
44        return false;
45    }
46    CHECK_PARAM(!span) {
47        SDL_InvalidParamError("span");
48        return false;
49    }
50    CHECK_PARAM(numrects < 1) {
51        SDL_InvalidParamError("numrects");
52        return false;
53    }
54
55    // Initialize to empty rect
56    span_y1 = height;
57    span_y2 = 0;
58
59    for (i = 0; i < numrects; ++i) {
60        rect_y1 = rects[i].y;
61        rect_y2 = rect_y1 + rects[i].h;
62
63        // Clip out of bounds rectangles, and expand span rect
64        if (rect_y1 < 0) {
65            span_y1 = 0;
66        } else if (rect_y1 < span_y1) {
67            span_y1 = rect_y1;
68        }
69        if (rect_y2 > height) {
70            span_y2 = height;
71        } else if (rect_y2 > span_y2) {
72            span_y2 = rect_y2;
73        }
74    }
75    if (span_y2 > span_y1) {
76        span->x = 0;
77        span->y = span_y1;
78        span->w = width;
79        span->h = (span_y2 - span_y1);
80        return true;
81    }
82    return false;
83}
84
85// For use with the Cohen-Sutherland algorithm for line clipping, in SDL_rect_impl.h
86#define CODE_BOTTOM 1
87#define CODE_TOP    2
88#define CODE_LEFT   4
89#define CODE_RIGHT  8
90
91// Same code twice, for float and int versions...
92#define RECTTYPE                 SDL_Rect
93#define POINTTYPE                SDL_Point
94#define SCALARTYPE               int
95#define BIGSCALARTYPE            Sint64
96#define COMPUTEOUTCODE           ComputeOutCode
97#define ENCLOSEPOINTS_EPSILON    1
98#define SDL_RECT_CAN_OVERFLOW    SDL_RectCanOverflow
99#define SDL_HASINTERSECTION      SDL_HasRectIntersection
100#define SDL_INTERSECTRECT        SDL_GetRectIntersection
101#define SDL_RECTEMPTY            SDL_RectEmpty
102#define SDL_UNIONRECT            SDL_GetRectUnion
103#define SDL_ENCLOSEPOINTS        SDL_GetRectEnclosingPoints
104#define SDL_INTERSECTRECTANDLINE SDL_GetRectAndLineIntersection
105#include "SDL_rect_impl.h"
106
107#define RECTTYPE                 SDL_FRect
108#define POINTTYPE                SDL_FPoint
109#define SCALARTYPE               float
110#define BIGSCALARTYPE            double
111#define COMPUTEOUTCODE           ComputeOutCodeFloat
112#define ENCLOSEPOINTS_EPSILON    0.0f
113#define SDL_RECT_CAN_OVERFLOW    SDL_RectCanOverflowFloat
114#define SDL_HASINTERSECTION      SDL_HasRectIntersectionFloat
115#define SDL_INTERSECTRECT        SDL_GetRectIntersectionFloat
116#define SDL_RECTEMPTY            SDL_RectEmptyFloat
117#define SDL_UNIONRECT            SDL_GetRectUnionFloat
118#define SDL_ENCLOSEPOINTS        SDL_GetRectEnclosingPointsFloat
119#define SDL_INTERSECTRECTANDLINE SDL_GetRectAndLineIntersectionFloat
120#include "SDL_rect_impl.h"
121
[FILE END]
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