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annotate src/video/SDL_drawline.c @ 3596:f638ded38b8a

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Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color. Renamed SDL_RenderPoint() and SDL_RenderLine() to SDL_RenderDrawPoint() and SDL_RenderDrawLine(). Added API for rectangle drawing (as opposed to filling) Added placeholder API functions for circles and ellipses ... I'm not sure whether these will stay. Optimized software line drawing quite a bit. Added support for Wu's anti-aliased line drawing, currently disabled by default.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 23 Dec 2009 01:55:00 +0000
parents c8bed77b0386
children 0d6f520c0eb9
rev   line source
2888
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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1 /*
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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2 SDL - Simple DirectMedia Layer
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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3 Copyright (C) 1997-2009 Sam Lantinga
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4
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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5 This library is free software; you can redistribute it and/or
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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6 modify it under the terms of the GNU Lesser General Public
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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7 License as published by the Free Software Foundation; either
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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8 version 2.1 of the License, or (at your option) any later version.
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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9
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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10 This library is distributed in the hope that it will be useful,
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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13 Lesser General Public License for more details.
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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14
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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15 You should have received a copy of the GNU Lesser General Public
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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16 License along with this library; if not, write to the Free Software
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
2898
e40448bc7727 Share code between fill and line drawing
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24 #include "SDL_draw.h"
2890
1863c8b59658 Placeholder for line drawing algorithm (current code doesn't work)
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25
3596
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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26 static void
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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27 SDL_DrawLine1(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color,
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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28 SDL_bool draw_end)
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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29 {
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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30 if (y1 == y2) {
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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31 HLINE(Uint8, DRAW_FASTSETPIXEL1, draw_end);
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32 } else if (x1 == x2) {
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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33 VLINE(Uint8, DRAW_FASTSETPIXEL1, draw_end);
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34 } else if (ABS(x1 - x2) == ABS(y1 - y2)) {
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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35 DLINE(Uint8, DRAW_FASTSETPIXEL1, draw_end);
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36 } else {
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37 BLINE(x1, y1, x2, y2, DRAW_FASTSETPIXELXY1, draw_end);
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38 }
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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39 }
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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40
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41 static void
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42 SDL_DrawLine2(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color,
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43 SDL_bool draw_end)
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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44 {
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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45 if (y1 == y2) {
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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46 HLINE(Uint16, DRAW_FASTSETPIXEL2, draw_end);
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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47 } else if (x1 == x2) {
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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48 VLINE(Uint16, DRAW_FASTSETPIXEL2, draw_end);
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49 } else if (ABS(x1 - x2) == ABS(y1 - y2)) {
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50 DLINE(Uint16, DRAW_FASTSETPIXEL2, draw_end);
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51 } else {
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52 Uint8 _r, _g, _b, _a;
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53 const SDL_PixelFormat * fmt = dst->format;
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54 SDL_GetRGBA(color, fmt, &_r, &_g, &_b, &_a);
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55 if (fmt->Rmask == 0x7C00) {
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56 AALINE(x1, y1, x2, y2,
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57 DRAW_FASTSETPIXELXY2, DRAW_SETPIXELXY_BLEND_RGB555,
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58 draw_end);
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59 } else if (fmt->Rmask == 0xF800) {
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60 AALINE(x1, y1, x2, y2,
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61 DRAW_FASTSETPIXELXY2, DRAW_SETPIXELXY_BLEND_RGB565,
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62 draw_end);
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63 } else {
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64 AALINE(x1, y1, x2, y2,
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65 DRAW_FASTSETPIXELXY2, DRAW_SETPIXELXY2_BLEND_RGB,
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66 draw_end);
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67 }
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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68 }
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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69 }
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70
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71 static void
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72 SDL_DrawLine4(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color,
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73 SDL_bool draw_end)
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74 {
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75 if (y1 == y2) {
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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76 HLINE(Uint32, DRAW_FASTSETPIXEL4, draw_end);
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77 } else if (x1 == x2) {
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78 VLINE(Uint32, DRAW_FASTSETPIXEL4, draw_end);
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79 } else if (ABS(x1 - x2) == ABS(y1 - y2)) {
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80 DLINE(Uint32, DRAW_FASTSETPIXEL4, draw_end);
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81 } else {
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82 Uint8 _r, _g, _b, _a;
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83 const SDL_PixelFormat * fmt = dst->format;
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84 SDL_GetRGBA(color, fmt, &_r, &_g, &_b, &_a);
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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85 if (fmt->Rmask == 0x00FF0000) {
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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86 if (!fmt->Amask) {
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87 AALINE(x1, y1, x2, y2,
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88 DRAW_FASTSETPIXELXY4, DRAW_SETPIXELXY_BLEND_RGB888,
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89 draw_end);
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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90 } else {
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91 AALINE(x1, y1, x2, y2,
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92 DRAW_FASTSETPIXELXY4, DRAW_SETPIXELXY_BLEND_ARGB8888,
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93 draw_end);
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94 }
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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95 } else {
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96 AALINE(x1, y1, x2, y2,
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97 DRAW_FASTSETPIXELXY4, DRAW_SETPIXELXY4_BLEND_RGB,
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98 draw_end);
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99 }
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100 }
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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101 }
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102
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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103 typedef void (*DrawLineFunc) (SDL_Surface * dst,
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104 int x1, int y1, int x2, int y2,
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105 Uint32 color, SDL_bool draw_end);
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106
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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107 static DrawLineFunc
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108 SDL_CalculateDrawLineFunc(const SDL_PixelFormat * fmt)
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109 {
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110 switch (fmt->BytesPerPixel) {
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111 case 1:
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112 if (fmt->BitsPerPixel < 8) {
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113 break;
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114 }
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115 return SDL_DrawLine1;
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116 case 2:
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117 return SDL_DrawLine2;
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118 case 4:
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119 return SDL_DrawLine4;
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120 }
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121 return NULL;
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122 }
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123
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124 int
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125 SDL_DrawLine(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color)
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126 {
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127 DrawLineFunc func;
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128
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129 if (!dst) {
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130 SDL_SetError("SDL_DrawLine(): Passed NULL destination surface");
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131 return -1;
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132 }
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133
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134 func = SDL_CalculateDrawLineFunc(dst->format);
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135 if (!func) {
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136 SDL_SetError("SDL_DrawLine(): Unsupported surface format");
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137 return -1;
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138 }
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139
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140 /* Perform clipping */
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141 /* FIXME: We don't actually want to clip, as it may change line slope */
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142 if (!SDL_IntersectRectAndLine(&dst->clip_rect, &x1, &y1, &x2, &y2)) {
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143 return 0;
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144 }
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145
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146 func(dst, x1, y1, x2, y2, color, SDL_TRUE);
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147 return 0;
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148 }
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149
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150 int
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151 SDL_DrawLines(SDL_Surface * dst, const SDL_Point * points, int count,
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152 Uint32 color)
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153 {
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154 int i;
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155 int x1, y1;
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156 int x2, y2;
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157 SDL_bool draw_end;
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158 DrawLineFunc func;
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159
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160 if (!dst) {
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161 SDL_SetError("SDL_DrawLines(): Passed NULL destination surface");
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162 return -1;
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163 }
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164
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165 func = SDL_CalculateDrawLineFunc(dst->format);
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166 if (!func) {
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167 SDL_SetError("SDL_DrawLines(): Unsupported surface format");
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168 return -1;
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169 }
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170
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171 for (i = 1; i < count; ++i) {
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172 x1 = points[i-1].x;
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173 y1 = points[i-1].y;
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174 x2 = points[i].x;
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175 y2 = points[i].y;
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176
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177 /* Perform clipping */
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178 /* FIXME: We don't actually want to clip, as it may change line slope */
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179 if (!SDL_IntersectRectAndLine(&dst->clip_rect, &x1, &y1, &x2, &y2)) {
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180 continue;
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181 }
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182
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183 /* Draw the end if it was clipped */
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184 draw_end = (x2 != points[i].x || y2 != points[i].y);
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185
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186 func(dst, x1, y1, x2, y2, color, draw_end);
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187 }
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188 if (points[0].x != points[count-1].x || points[0].y != points[count-1].y) {
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189 SDL_DrawPoint(dst, points[count-1].x, points[count-1].y, color);
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190 }
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191 return 0;
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192 }
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193
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194 /* vi: set ts=4 sw=4 expandtab: */