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annotate src/video/SDL_drawline.c @ 5157:fb424691cfc7

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Moved the rendering code out to a separate directory in the hope that it can someday be completely decoupled from the rest of the library and be expanded to an awesome 2D on 3D library.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 02 Feb 2011 14:34:54 -0800
parents f7b03b6838cb
children
rev   line source
2888
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 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.
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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,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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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
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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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
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24 #include "SDL_draw.h"
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25
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26 static void
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27 SDL_DrawLine1(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color,
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28 SDL_bool draw_end)
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29 {
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30 if (y1 == y2) {
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31 //HLINE(Uint8, DRAW_FASTSETPIXEL1, draw_end);
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32 int length;
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33 int pitch = (dst->pitch / dst->format->BytesPerPixel);
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34 Uint8 *pixel;
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35 if (x1 <= x2) {
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36 pixel = (Uint8 *)dst->pixels + y1 * pitch + x1;
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37 length = draw_end ? (x2-x1+1) : (x2-x1);
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38 } else {
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39 pixel = (Uint8 *)dst->pixels + y1 * pitch + x2;
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40 if (!draw_end) {
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41 ++pixel;
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42 }
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43 length = draw_end ? (x1-x2+1) : (x1-x2);
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44 }
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45 SDL_memset(pixel, color, length);
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46 } else if (x1 == x2) {
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47 VLINE(Uint8, DRAW_FASTSETPIXEL1, draw_end);
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48 } else if (ABS(x1 - x2) == ABS(y1 - y2)) {
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49 DLINE(Uint8, DRAW_FASTSETPIXEL1, draw_end);
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50 } else {
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51 BLINE(x1, y1, x2, y2, DRAW_FASTSETPIXELXY1, draw_end);
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52 }
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53 }
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54
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55 static void
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56 SDL_DrawLine2(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color,
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57 SDL_bool draw_end)
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58 {
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59 if (y1 == y2) {
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60 HLINE(Uint16, DRAW_FASTSETPIXEL2, draw_end);
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61 } else if (x1 == x2) {
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62 VLINE(Uint16, DRAW_FASTSETPIXEL2, draw_end);
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63 } else if (ABS(x1 - x2) == ABS(y1 - y2)) {
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64 DLINE(Uint16, DRAW_FASTSETPIXEL2, draw_end);
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65 } else {
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66 Uint8 _r, _g, _b, _a;
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67 const SDL_PixelFormat * fmt = dst->format;
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68 SDL_GetRGBA(color, fmt, &_r, &_g, &_b, &_a);
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69 if (fmt->Rmask == 0x7C00) {
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70 AALINE(x1, y1, x2, y2,
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71 DRAW_FASTSETPIXELXY2, DRAW_SETPIXELXY_BLEND_RGB555,
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72 draw_end);
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73 } else if (fmt->Rmask == 0xF800) {
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74 AALINE(x1, y1, x2, y2,
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75 DRAW_FASTSETPIXELXY2, DRAW_SETPIXELXY_BLEND_RGB565,
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76 draw_end);
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77 } else {
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78 AALINE(x1, y1, x2, y2,
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79 DRAW_FASTSETPIXELXY2, DRAW_SETPIXELXY2_BLEND_RGB,
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80 draw_end);
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81 }
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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82 }
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83 }
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84
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85 static void
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86 SDL_DrawLine4(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color,
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87 SDL_bool draw_end)
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88 {
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89 if (y1 == y2) {
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90 HLINE(Uint32, DRAW_FASTSETPIXEL4, draw_end);
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91 } else if (x1 == x2) {
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92 VLINE(Uint32, DRAW_FASTSETPIXEL4, draw_end);
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93 } else if (ABS(x1 - x2) == ABS(y1 - y2)) {
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94 DLINE(Uint32, DRAW_FASTSETPIXEL4, draw_end);
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95 } else {
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96 Uint8 _r, _g, _b, _a;
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97 const SDL_PixelFormat * fmt = dst->format;
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98 SDL_GetRGBA(color, fmt, &_r, &_g, &_b, &_a);
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99 if (fmt->Rmask == 0x00FF0000) {
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100 if (!fmt->Amask) {
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101 AALINE(x1, y1, x2, y2,
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102 DRAW_FASTSETPIXELXY4, DRAW_SETPIXELXY_BLEND_RGB888,
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103 draw_end);
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104 } else {
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105 AALINE(x1, y1, x2, y2,
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106 DRAW_FASTSETPIXELXY4, DRAW_SETPIXELXY_BLEND_ARGB8888,
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107 draw_end);
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108 }
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109 } else {
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110 AALINE(x1, y1, x2, y2,
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111 DRAW_FASTSETPIXELXY4, DRAW_SETPIXELXY4_BLEND_RGB,
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112 draw_end);
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113 }
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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114 }
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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115 }
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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116
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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117 typedef void (*DrawLineFunc) (SDL_Surface * dst,
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118 int x1, int y1, int x2, int y2,
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119 Uint32 color, SDL_bool draw_end);
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120
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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121 static DrawLineFunc
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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122 SDL_CalculateDrawLineFunc(const SDL_PixelFormat * fmt)
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123 {
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124 switch (fmt->BytesPerPixel) {
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125 case 1:
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126 if (fmt->BitsPerPixel < 8) {
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127 break;
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128 }
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129 return SDL_DrawLine1;
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130 case 2:
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131 return SDL_DrawLine2;
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132 case 4:
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133 return SDL_DrawLine4;
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134 }
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135 return NULL;
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136 }
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137
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138 int
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139 SDL_DrawLine(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color)
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140 {
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141 DrawLineFunc func;
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142
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143 if (!dst) {
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144 SDL_SetError("SDL_DrawLine(): Passed NULL destination surface");
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145 return -1;
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146 }
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147
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148 func = SDL_CalculateDrawLineFunc(dst->format);
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149 if (!func) {
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150 SDL_SetError("SDL_DrawLine(): Unsupported surface format");
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151 return -1;
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152 }
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153
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154 /* Perform clipping */
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155 /* FIXME: We don't actually want to clip, as it may change line slope */
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156 if (!SDL_IntersectRectAndLine(&dst->clip_rect, &x1, &y1, &x2, &y2)) {
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157 return 0;
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158 }
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159
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160 func(dst, x1, y1, x2, y2, color, SDL_TRUE);
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161 return 0;
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162 }
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163
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164 int
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165 SDL_DrawLines(SDL_Surface * dst, const SDL_Point * points, int count,
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166 Uint32 color)
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167 {
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168 int i;
3596
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169 int x1, y1;
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170 int x2, y2;
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171 SDL_bool draw_end;
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172 DrawLineFunc func;
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173
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174 if (!dst) {
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175 SDL_SetError("SDL_DrawLines(): Passed NULL destination surface");
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176 return -1;
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177 }
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178
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179 func = SDL_CalculateDrawLineFunc(dst->format);
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180 if (!func) {
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181 SDL_SetError("SDL_DrawLines(): Unsupported surface format");
3536
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182 return -1;
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183 }
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184
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diff changeset
185 for (i = 1; i < count; ++i) {
3596
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186 x1 = points[i-1].x;
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187 y1 = points[i-1].y;
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188 x2 = points[i].x;
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189 y2 = points[i].y;
3536
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190
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191 /* Perform clipping */
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diff changeset
192 /* FIXME: We don't actually want to clip, as it may change line slope */
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
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parents: 2910
diff changeset
193 if (!SDL_IntersectRectAndLine(&dst->clip_rect, &x1, &y1, &x2, &y2)) {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
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diff changeset
194 continue;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
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diff changeset
195 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
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diff changeset
196
3596
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197 /* Draw the end if it was clipped */
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diff changeset
198 draw_end = (x2 != points[i].x || y2 != points[i].y);
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diff changeset
199
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diff changeset
200 func(dst, x1, y1, x2, y2, color, draw_end);
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
201 }
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
202 if (points[0].x != points[count-1].x || points[0].y != points[count-1].y) {
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
203 SDL_DrawPoint(dst, points[count-1].x, points[count-1].y, color);
3536
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diff changeset
204 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
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diff changeset
205 return 0;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
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diff changeset
206 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
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diff changeset
207
2888
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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parents:
diff changeset
208 /* vi: set ts=4 sw=4 expandtab: */