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annotate src/video/SDL_drawline.c @ 4778:9838d3525a1b

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Stubbed out the new get/set parameter functions, added the start of the enum, union, and struct for those parameters themselves, and added doxygen comments throughout the SDL_shape.h header.
author Eli Gottlieb <eligottlieb@gmail.com>
date Thu, 10 Jun 2010 17:37:19 -0400
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
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6 modify it under the terms of the GNU Lesser General Public
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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
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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 }
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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 }
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114 }
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115 }
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116
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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
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121 static DrawLineFunc
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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;
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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");
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182 return -1;
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183 }
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184
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185 for (i = 1; i < count; ++i) {
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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;
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190
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191 /* Perform clipping */
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192 /* FIXME: We don't actually want to clip, as it may change line slope */
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193 if (!SDL_IntersectRectAndLine(&dst->clip_rect, &x1, &y1, &x2, &y2)) {
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194 continue;
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195 }
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196
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197 /* Draw the end if it was clipped */
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198 draw_end = (x2 != points[i].x || y2 != points[i].y);
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199
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200 func(dst, x1, y1, x2, y2, color, draw_end);
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201 }
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202 if (points[0].x != points[count-1].x || points[0].y != points[count-1].y) {
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203 SDL_DrawPoint(dst, points[count-1].x, points[count-1].y, color);
3536
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204 }
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205 return 0;
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206 }
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207
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208 /* vi: set ts=4 sw=4 expandtab: */