Atlas - SDL_drawpoint.c
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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#ifdef SDL_VIDEO_RENDER_SW
24
25#include "SDL_draw.h"
26#include "SDL_drawpoint.h"
27
28bool SDL_DrawPoint(SDL_Surface *dst, int x, int y, Uint32 color)
29{
30    CHECK_PARAM(!SDL_SurfaceValid(dst)) {
31        return SDL_InvalidParamError("SDL_DrawPoint(): dst");
32    }
33
34    // This function doesn't work on surfaces < 8 bpp
35    if (dst->fmt->bits_per_pixel < 8) {
36        return SDL_SetError("SDL_DrawPoint(): Unsupported surface format");
37    }
38
39    // Perform clipping
40    if (x < dst->clip_rect.x || y < dst->clip_rect.y ||
41        x >= (dst->clip_rect.x + dst->clip_rect.w) ||
42        y >= (dst->clip_rect.y + dst->clip_rect.h)) {
43        return true;
44    }
45
46    switch (dst->fmt->bytes_per_pixel) {
47    case 1:
48        DRAW_FASTSETPIXELXY1(x, y);
49        break;
50    case 2:
51        DRAW_FASTSETPIXELXY2(x, y);
52        break;
53    case 3:
54        return SDL_Unsupported();
55    case 4:
56        DRAW_FASTSETPIXELXY4(x, y);
57        break;
58    }
59    return true;
60}
61
62bool SDL_DrawPoints(SDL_Surface *dst, const SDL_Point *points, int count, Uint32 color)
63{
64    int minx, miny;
65    int maxx, maxy;
66    int i;
67    int x, y;
68
69    CHECK_PARAM(!SDL_SurfaceValid(dst)) {
70        return SDL_InvalidParamError("SDL_DrawPoints(): dst");
71    }
72
73    // This function doesn't work on surfaces < 8 bpp
74    if (dst->fmt->bits_per_pixel < 8) {
75        return SDL_SetError("SDL_DrawPoints(): Unsupported surface format");
76    }
77
78    minx = dst->clip_rect.x;
79    maxx = dst->clip_rect.x + dst->clip_rect.w - 1;
80    miny = dst->clip_rect.y;
81    maxy = dst->clip_rect.y + dst->clip_rect.h - 1;
82
83    for (i = 0; i < count; ++i) {
84        x = points[i].x;
85        y = points[i].y;
86
87        if (x < minx || x > maxx || y < miny || y > maxy) {
88            continue;
89        }
90
91        switch (dst->fmt->bytes_per_pixel) {
92        case 1:
93            DRAW_FASTSETPIXELXY1(x, y);
94            break;
95        case 2:
96            DRAW_FASTSETPIXELXY2(x, y);
97            break;
98        case 3:
99            return SDL_Unsupported();
100        case 4:
101            DRAW_FASTSETPIXELXY4(x, y);
102            break;
103        }
104    }
105    return true;
106}
107
108#endif // SDL_VIDEO_RENDER_SW
109
[FILE END]
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