sdl

FORK: Simple Directmedia Layer
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SDL_drawpoint.c (3156B)

      1 /*
      2   Simple DirectMedia Layer
      3   Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
      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 #if SDL_VIDEO_RENDER_SW && !SDL_RENDER_DISABLED
     24 
     25 #include "SDL_draw.h"
     26 #include "SDL_drawpoint.h"
     27 
     28 
     29 int
     30 SDL_DrawPoint(SDL_Surface * dst, int x, int y, Uint32 color)
     31 {
     32     if (!dst) {
     33         return SDL_SetError("Passed NULL destination surface");
     34     }
     35 
     36     /* This function doesn't work on surfaces < 8 bpp */
     37     if (dst->format->BitsPerPixel < 8) {
     38         return SDL_SetError("SDL_DrawPoint(): Unsupported surface format");
     39     }
     40 
     41     /* Perform clipping */
     42     if (x < dst->clip_rect.x || y < dst->clip_rect.y ||
     43         x >= (dst->clip_rect.x + dst->clip_rect.w) ||
     44         y >= (dst->clip_rect.y + dst->clip_rect.h)) {
     45         return 0;
     46     }
     47 
     48     switch (dst->format->BytesPerPixel) {
     49     case 1:
     50         DRAW_FASTSETPIXELXY1(x, y);
     51         break;
     52     case 2:
     53         DRAW_FASTSETPIXELXY2(x, y);
     54         break;
     55     case 3:
     56         return SDL_Unsupported();
     57     case 4:
     58         DRAW_FASTSETPIXELXY4(x, y);
     59         break;
     60     }
     61     return 0;
     62 }
     63 
     64 int
     65 SDL_DrawPoints(SDL_Surface * dst, const SDL_Point * points, int count,
     66                Uint32 color)
     67 {
     68     int minx, miny;
     69     int maxx, maxy;
     70     int i;
     71     int x, y;
     72 
     73     if (!dst) {
     74         return SDL_SetError("Passed NULL destination surface");
     75     }
     76 
     77     /* This function doesn't work on surfaces < 8 bpp */
     78     if (dst->format->BitsPerPixel < 8) {
     79         return SDL_SetError("SDL_DrawPoints(): Unsupported surface format");
     80     }
     81 
     82     minx = dst->clip_rect.x;
     83     maxx = dst->clip_rect.x + dst->clip_rect.w - 1;
     84     miny = dst->clip_rect.y;
     85     maxy = dst->clip_rect.y + dst->clip_rect.h - 1;
     86 
     87     for (i = 0; i < count; ++i) {
     88         x = points[i].x;
     89         y = points[i].y;
     90 
     91         if (x < minx || x > maxx || y < miny || y > maxy) {
     92             continue;
     93         }
     94 
     95         switch (dst->format->BytesPerPixel) {
     96         case 1:
     97             DRAW_FASTSETPIXELXY1(x, y);
     98             break;
     99         case 2:
    100             DRAW_FASTSETPIXELXY2(x, y);
    101             break;
    102         case 3:
    103             return SDL_Unsupported();
    104         case 4:
    105             DRAW_FASTSETPIXELXY4(x, y);
    106             break;
    107         }
    108     }
    109     return 0;
    110 }
    111 
    112 #endif /* SDL_VIDEO_RENDER_SW && !SDL_RENDER_DISABLED */
    113 
    114 /* vi: set ts=4 sw=4 expandtab: */