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comparison src/video/SDL_drawline.c @ 3536:0267b8b1595c

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Added interfaces for batch drawing of points, lines and rects: SDL_DrawPoints() SDL_BlendPoints() SDL_BlendLines() SDL_DrawLines() SDL_FillRects() SDL_BlendRects() SDL_RenderPoints() SDL_RenderLines() SDL_RenderRects() Renamed SDL_RenderFill() to SDL_RenderRect()
author Sam Lantinga <slouken@libsdl.org>
date Wed, 09 Dec 2009 15:56:56 +0000
parents 27d8b12e0e8e
children c8bed77b0386
comparison
equal deleted inserted replaced
3535:b403f790df65 3536:0267b8b1595c
25 25
26 26
27 int 27 int
28 SDL_DrawLine(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color) 28 SDL_DrawLine(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color)
29 { 29 {
30 if (!dst) {
31 SDL_SetError("Passed NULL destination surface");
32 return -1;
33 }
34
30 /* This function doesn't work on surfaces < 8 bpp */ 35 /* This function doesn't work on surfaces < 8 bpp */
31 if (dst->format->BitsPerPixel < 8) { 36 if (dst->format->BitsPerPixel < 8) {
32 SDL_SetError("SDL_DrawLine(): Unsupported surface format"); 37 SDL_SetError("SDL_DrawLine(): Unsupported surface format");
33 return (-1); 38 return -1;
34 } 39 }
35 40
36 /* Perform clipping */ 41 /* Perform clipping */
42 /* FIXME: We don't actually want to clip, as it may change line slope */
37 if (!SDL_IntersectRectAndLine(&dst->clip_rect, &x1, &y1, &x2, &y2)) { 43 if (!SDL_IntersectRectAndLine(&dst->clip_rect, &x1, &y1, &x2, &y2)) {
38 return (0); 44 return (0);
39 } 45 }
40 46
41 switch (dst->format->BytesPerPixel) { 47 switch (dst->format->BytesPerPixel) {
53 break; 59 break;
54 } 60 }
55 return 0; 61 return 0;
56 } 62 }
57 63
64 int
65 SDL_DrawLines(SDL_Surface * dst, const SDL_Point * points, int count,
66 Uint32 color)
67 {
68 int i;
69
70 if (!dst) {
71 SDL_SetError("Passed NULL destination surface");
72 return -1;
73 }
74
75 /* This function doesn't work on surfaces < 8 bpp */
76 if (dst->format->BitsPerPixel < 8) {
77 SDL_SetError("SDL_DrawLine(): Unsupported surface format");
78 return -1;
79 }
80
81 if (count < 2) {
82 return 0;
83 }
84
85 for (i = 1; i < count; ++i) {
86 int x1 = points[i-1].x;
87 int y1 = points[i-1].y;
88 int x2 = points[i].x;
89 int y2 = points[i].y;
90
91 /* Perform clipping */
92 /* FIXME: We don't actually want to clip, as it may change line slope */
93 if (!SDL_IntersectRectAndLine(&dst->clip_rect, &x1, &y1, &x2, &y2)) {
94 continue;
95 }
96
97 switch (dst->format->BytesPerPixel) {
98 case 1:
99 DRAWLINE(x1, y1, x2, y2, DRAW_FASTSETPIXEL1);
100 break;
101 case 2:
102 DRAWLINE(x1, y1, x2, y2, DRAW_FASTSETPIXEL2);
103 break;
104 case 3:
105 SDL_Unsupported();
106 return -1;
107 case 4:
108 DRAWLINE(x1, y1, x2, y2, DRAW_FASTSETPIXEL4);
109 break;
110 }
111 }
112 return 0;
113 }
114
58 /* vi: set ts=4 sw=4 expandtab: */ 115 /* vi: set ts=4 sw=4 expandtab: */