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annotate src/render/software/SDL_drawline.c @ 5167:97423d858a1a

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Added an intro to the features and goals of the 2D rendering API.
author Sam Lantinga <slouken@libsdl.org>
date Thu, 03 Feb 2011 10:03:55 -0800
parents d72793305335
children 4d39eeaad00b
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
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
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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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e40448bc7727 Share code between fill and line drawing
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24 #include "SDL_draw.h"
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25 #include "SDL_drawline.h"
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26
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27
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28 static void
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29 SDL_DrawLine1(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color,
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30 SDL_bool draw_end)
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31 {
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32 if (y1 == y2) {
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33 //HLINE(Uint8, DRAW_FASTSETPIXEL1, draw_end);
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34 int length;
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35 int pitch = (dst->pitch / dst->format->BytesPerPixel);
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36 Uint8 *pixel;
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37 if (x1 <= x2) {
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38 pixel = (Uint8 *)dst->pixels + y1 * pitch + x1;
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39 length = draw_end ? (x2-x1+1) : (x2-x1);
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40 } else {
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41 pixel = (Uint8 *)dst->pixels + y1 * pitch + x2;
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42 if (!draw_end) {
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43 ++pixel;
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44 }
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45 length = draw_end ? (x1-x2+1) : (x1-x2);
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46 }
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47 SDL_memset(pixel, color, length);
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48 } else if (x1 == x2) {
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49 VLINE(Uint8, DRAW_FASTSETPIXEL1, draw_end);
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50 } else if (ABS(x1 - x2) == ABS(y1 - y2)) {
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51 DLINE(Uint8, DRAW_FASTSETPIXEL1, draw_end);
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52 } else {
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53 BLINE(x1, y1, x2, y2, DRAW_FASTSETPIXELXY1, draw_end);
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54 }
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55 }
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56
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57 static void
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58 SDL_DrawLine2(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color,
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59 SDL_bool draw_end)
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60 {
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61 if (y1 == y2) {
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62 HLINE(Uint16, DRAW_FASTSETPIXEL2, draw_end);
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63 } else if (x1 == x2) {
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64 VLINE(Uint16, DRAW_FASTSETPIXEL2, draw_end);
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65 } else if (ABS(x1 - x2) == ABS(y1 - y2)) {
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66 DLINE(Uint16, DRAW_FASTSETPIXEL2, draw_end);
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67 } else {
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68 Uint8 _r, _g, _b, _a;
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69 const SDL_PixelFormat * fmt = dst->format;
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70 SDL_GetRGBA(color, fmt, &_r, &_g, &_b, &_a);
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71 if (fmt->Rmask == 0x7C00) {
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72 AALINE(x1, y1, x2, y2,
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73 DRAW_FASTSETPIXELXY2, DRAW_SETPIXELXY_BLEND_RGB555,
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74 draw_end);
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75 } else if (fmt->Rmask == 0xF800) {
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76 AALINE(x1, y1, x2, y2,
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77 DRAW_FASTSETPIXELXY2, DRAW_SETPIXELXY_BLEND_RGB565,
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78 draw_end);
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79 } else {
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80 AALINE(x1, y1, x2, y2,
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81 DRAW_FASTSETPIXELXY2, DRAW_SETPIXELXY2_BLEND_RGB,
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82 draw_end);
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83 }
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84 }
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85 }
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86
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87 static void
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88 SDL_DrawLine4(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color,
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89 SDL_bool draw_end)
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90 {
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91 if (y1 == y2) {
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92 HLINE(Uint32, DRAW_FASTSETPIXEL4, draw_end);
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93 } else if (x1 == x2) {
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94 VLINE(Uint32, DRAW_FASTSETPIXEL4, draw_end);
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95 } else if (ABS(x1 - x2) == ABS(y1 - y2)) {
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96 DLINE(Uint32, DRAW_FASTSETPIXEL4, draw_end);
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97 } else {
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98 Uint8 _r, _g, _b, _a;
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99 const SDL_PixelFormat * fmt = dst->format;
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100 SDL_GetRGBA(color, fmt, &_r, &_g, &_b, &_a);
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101 if (fmt->Rmask == 0x00FF0000) {
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102 if (!fmt->Amask) {
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103 AALINE(x1, y1, x2, y2,
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104 DRAW_FASTSETPIXELXY4, DRAW_SETPIXELXY_BLEND_RGB888,
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105 draw_end);
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106 } else {
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107 AALINE(x1, y1, x2, y2,
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108 DRAW_FASTSETPIXELXY4, DRAW_SETPIXELXY_BLEND_ARGB8888,
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109 draw_end);
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110 }
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111 } else {
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112 AALINE(x1, y1, x2, y2,
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113 DRAW_FASTSETPIXELXY4, DRAW_SETPIXELXY4_BLEND_RGB,
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114 draw_end);
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115 }
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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 }
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118
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119 typedef void (*DrawLineFunc) (SDL_Surface * dst,
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120 int x1, int y1, int x2, int y2,
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121 Uint32 color, SDL_bool draw_end);
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122
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123 static DrawLineFunc
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124 SDL_CalculateDrawLineFunc(const SDL_PixelFormat * fmt)
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125 {
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126 switch (fmt->BytesPerPixel) {
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127 case 1:
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128 if (fmt->BitsPerPixel < 8) {
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129 break;
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130 }
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131 return SDL_DrawLine1;
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132 case 2:
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133 return SDL_DrawLine2;
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134 case 4:
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135 return SDL_DrawLine4;
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136 }
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137 return NULL;
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138 }
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139
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140 int
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141 SDL_DrawLine(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color)
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142 {
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143 DrawLineFunc func;
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144
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145 if (!dst) {
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146 SDL_SetError("SDL_DrawLine(): Passed NULL destination surface");
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147 return -1;
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148 }
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149
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150 func = SDL_CalculateDrawLineFunc(dst->format);
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151 if (!func) {
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152 SDL_SetError("SDL_DrawLine(): Unsupported surface format");
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153 return -1;
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154 }
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155
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156 /* Perform clipping */
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157 /* FIXME: We don't actually want to clip, as it may change line slope */
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158 if (!SDL_IntersectRectAndLine(&dst->clip_rect, &x1, &y1, &x2, &y2)) {
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159 return 0;
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160 }
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161
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162 func(dst, x1, y1, x2, y2, color, SDL_TRUE);
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163 return 0;
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164 }
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165
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166 int
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167 SDL_DrawLines(SDL_Surface * dst, const SDL_Point * points, int count,
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168 Uint32 color)
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169 {
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170 int i;
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171 int x1, y1;
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172 int x2, y2;
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173 SDL_bool draw_end;
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174 DrawLineFunc func;
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175
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176 if (!dst) {
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177 SDL_SetError("SDL_DrawLines(): Passed NULL destination surface");
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178 return -1;
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179 }
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180
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181 func = SDL_CalculateDrawLineFunc(dst->format);
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182 if (!func) {
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183 SDL_SetError("SDL_DrawLines(): Unsupported surface format");
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184 return -1;
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185 }
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186
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diff changeset
187 for (i = 1; i < count; ++i) {
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188 x1 = points[i-1].x;
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189 y1 = points[i-1].y;
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190 x2 = points[i].x;
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191 y2 = points[i].y;
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192
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193 /* Perform clipping */
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194 /* FIXME: We don't actually want to clip, as it may change line slope */
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parents: 2910
diff changeset
195 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
196 continue;
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diff changeset
197 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
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diff changeset
198
3596
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199 /* Draw the end if it was clipped */
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diff changeset
200 draw_end = (x2 != points[i].x || y2 != points[i].y);
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diff changeset
201
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diff changeset
202 func(dst, x1, y1, x2, y2, color, draw_end);
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diff changeset
203 }
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
204 if (points[0].x != points[count-1].x || points[0].y != points[count-1].y) {
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diff changeset
205 SDL_DrawPoint(dst, points[count-1].x, points[count-1].y, color);
3536
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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 return 0;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
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diff changeset
208 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
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diff changeset
209
2888
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diff changeset
210 /* vi: set ts=4 sw=4 expandtab: */