SDL  2.0
SDL_drawpoint.c
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1 /*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2018 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_RENDER_DISABLED
24 
25 #include "SDL_draw.h"
26 #include "SDL_drawpoint.h"
27 
28 
29 int
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:
51  break;
52  case 2:
54  break;
55  case 3:
56  return SDL_Unsupported();
57  case 4:
59  break;
60  }
61  return 0;
62 }
63 
64 int
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:
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_RENDER_DISABLED */
113 
114 /* vi: set ts=4 sw=4 expandtab: */
GLenum GLenum dst
GLint GLint GLint GLint GLint x
Definition: SDL_opengl.h:1574
Uint8 BytesPerPixel
Definition: SDL_pixels.h:320
GLuint GLuint GLsizei count
Definition: SDL_opengl.h:1571
#define DRAW_FASTSETPIXELXY1(x, y)
Definition: SDL_draw.h:42
#define DRAW_FASTSETPIXELXY4(x, y)
Definition: SDL_draw.h:44
The structure that defines a point.
Definition: SDL_rect.h:48
A collection of pixels used in software blitting.
Definition: SDL_surface.h:69
uint32_t Uint32
Definition: SDL_stdinc.h:181
GLfixed GLfixed GLint GLint GLfixed points
int x
Definition: SDL_rect.h:50
int y
Definition: SDL_rect.h:51
Uint8 BitsPerPixel
Definition: SDL_pixels.h:319
GLint GLint GLint GLint GLint GLint y
Definition: SDL_opengl.h:1574
int x
Definition: SDL_rect.h:66
int w
Definition: SDL_rect.h:67
SDL_Rect clip_rect
Definition: SDL_surface.h:85
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
Definition: SDL_x11sym.h:50
#define DRAW_FASTSETPIXELXY2(x, y)
Definition: SDL_draw.h:43
SDL_PixelFormat * format
Definition: SDL_surface.h:72
#define SDL_SetError
int SDL_DrawPoints(SDL_Surface *dst, const SDL_Point *points, int count, Uint32 color)
Definition: SDL_drawpoint.c:65
int h
Definition: SDL_rect.h:67
GLuint color
int y
Definition: SDL_rect.h:66
#define SDL_Unsupported()
Definition: SDL_error.h:53
int SDL_DrawPoint(SDL_Surface *dst, int x, int y, Uint32 color)
Definition: SDL_drawpoint.c:30