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annotate src/render/software/SDL_drawline.c @ 5226:2ee8112bfc6b

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Added a simple log message API
author Sam Lantinga <slouken@libsdl.org>
date Mon, 07 Feb 2011 16:45:40 -0800
parents 4d39eeaad00b
children 710d00cb3a6a
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
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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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24 #include "SDL_draw.h"
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25 #include "SDL_drawline.h"
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26 #include "SDL_drawpoint.h"
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27
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28
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29 static void
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30 SDL_DrawLine1(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color,
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31 SDL_bool draw_end)
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32 {
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33 if (y1 == y2) {
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34 //HLINE(Uint8, DRAW_FASTSETPIXEL1, draw_end);
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35 int length;
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36 int pitch = (dst->pitch / dst->format->BytesPerPixel);
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37 Uint8 *pixel;
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38 if (x1 <= x2) {
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39 pixel = (Uint8 *)dst->pixels + y1 * pitch + x1;
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40 length = draw_end ? (x2-x1+1) : (x2-x1);
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41 } else {
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42 pixel = (Uint8 *)dst->pixels + y1 * pitch + x2;
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43 if (!draw_end) {
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44 ++pixel;
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45 }
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46 length = draw_end ? (x1-x2+1) : (x1-x2);
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47 }
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48 SDL_memset(pixel, color, length);
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49 } else if (x1 == x2) {
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50 VLINE(Uint8, DRAW_FASTSETPIXEL1, draw_end);
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51 } else if (ABS(x1 - x2) == ABS(y1 - y2)) {
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52 DLINE(Uint8, DRAW_FASTSETPIXEL1, draw_end);
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53 } else {
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54 BLINE(x1, y1, x2, y2, DRAW_FASTSETPIXELXY1, draw_end);
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55 }
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56 }
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57
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58 static void
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59 SDL_DrawLine2(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color,
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60 SDL_bool draw_end)
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61 {
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62 if (y1 == y2) {
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63 HLINE(Uint16, DRAW_FASTSETPIXEL2, draw_end);
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64 } else if (x1 == x2) {
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65 VLINE(Uint16, DRAW_FASTSETPIXEL2, draw_end);
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66 } else if (ABS(x1 - x2) == ABS(y1 - y2)) {
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67 DLINE(Uint16, DRAW_FASTSETPIXEL2, draw_end);
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68 } else {
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69 Uint8 _r, _g, _b, _a;
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70 const SDL_PixelFormat * fmt = dst->format;
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71 SDL_GetRGBA(color, fmt, &_r, &_g, &_b, &_a);
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72 if (fmt->Rmask == 0x7C00) {
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73 AALINE(x1, y1, x2, y2,
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74 DRAW_FASTSETPIXELXY2, DRAW_SETPIXELXY_BLEND_RGB555,
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75 draw_end);
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76 } else if (fmt->Rmask == 0xF800) {
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77 AALINE(x1, y1, x2, y2,
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78 DRAW_FASTSETPIXELXY2, DRAW_SETPIXELXY_BLEND_RGB565,
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79 draw_end);
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80 } else {
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81 AALINE(x1, y1, x2, y2,
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82 DRAW_FASTSETPIXELXY2, DRAW_SETPIXELXY2_BLEND_RGB,
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83 draw_end);
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84 }
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85 }
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86 }
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87
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88 static void
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89 SDL_DrawLine4(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color,
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90 SDL_bool draw_end)
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91 {
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92 if (y1 == y2) {
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93 HLINE(Uint32, DRAW_FASTSETPIXEL4, draw_end);
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94 } else if (x1 == x2) {
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95 VLINE(Uint32, DRAW_FASTSETPIXEL4, draw_end);
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96 } else if (ABS(x1 - x2) == ABS(y1 - y2)) {
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97 DLINE(Uint32, DRAW_FASTSETPIXEL4, draw_end);
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98 } else {
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99 Uint8 _r, _g, _b, _a;
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100 const SDL_PixelFormat * fmt = dst->format;
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101 SDL_GetRGBA(color, fmt, &_r, &_g, &_b, &_a);
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102 if (fmt->Rmask == 0x00FF0000) {
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103 if (!fmt->Amask) {
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104 AALINE(x1, y1, x2, y2,
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105 DRAW_FASTSETPIXELXY4, DRAW_SETPIXELXY_BLEND_RGB888,
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106 draw_end);
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107 } else {
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108 AALINE(x1, y1, x2, y2,
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109 DRAW_FASTSETPIXELXY4, DRAW_SETPIXELXY_BLEND_ARGB8888,
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110 draw_end);
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111 }
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112 } else {
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113 AALINE(x1, y1, x2, y2,
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114 DRAW_FASTSETPIXELXY4, DRAW_SETPIXELXY4_BLEND_RGB,
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115 draw_end);
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116 }
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117 }
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118 }
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119
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120 typedef void (*DrawLineFunc) (SDL_Surface * dst,
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121 int x1, int y1, int x2, int y2,
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122 Uint32 color, SDL_bool draw_end);
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123
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124 static DrawLineFunc
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125 SDL_CalculateDrawLineFunc(const SDL_PixelFormat * fmt)
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126 {
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127 switch (fmt->BytesPerPixel) {
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128 case 1:
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129 if (fmt->BitsPerPixel < 8) {
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130 break;
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131 }
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132 return SDL_DrawLine1;
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133 case 2:
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134 return SDL_DrawLine2;
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135 case 4:
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136 return SDL_DrawLine4;
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137 }
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138 return NULL;
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139 }
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140
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141 int
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142 SDL_DrawLine(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color)
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143 {
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144 DrawLineFunc func;
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145
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146 if (!dst) {
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147 SDL_SetError("SDL_DrawLine(): Passed NULL destination surface");
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148 return -1;
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149 }
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150
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151 func = SDL_CalculateDrawLineFunc(dst->format);
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152 if (!func) {
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153 SDL_SetError("SDL_DrawLine(): Unsupported surface format");
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154 return -1;
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155 }
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156
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157 /* Perform clipping */
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158 /* FIXME: We don't actually want to clip, as it may change line slope */
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159 if (!SDL_IntersectRectAndLine(&dst->clip_rect, &x1, &y1, &x2, &y2)) {
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160 return 0;
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161 }
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162
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163 func(dst, x1, y1, x2, y2, color, SDL_TRUE);
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164 return 0;
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165 }
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166
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167 int
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168 SDL_DrawLines(SDL_Surface * dst, const SDL_Point * points, int count,
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169 Uint32 color)
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170 {
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171 int i;
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172 int x1, y1;
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173 int x2, y2;
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174 SDL_bool draw_end;
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175 DrawLineFunc func;
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176
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177 if (!dst) {
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178 SDL_SetError("SDL_DrawLines(): Passed NULL destination surface");
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179 return -1;
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180 }
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181
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182 func = SDL_CalculateDrawLineFunc(dst->format);
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183 if (!func) {
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184 SDL_SetError("SDL_DrawLines(): Unsupported surface format");
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185 return -1;
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186 }
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187
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diff changeset
188 for (i = 1; i < count; ++i) {
3596
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189 x1 = points[i-1].x;
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190 y1 = points[i-1].y;
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191 x2 = points[i].x;
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192 y2 = points[i].y;
3536
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193
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194 /* Perform clipping */
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195 /* FIXME: We don't actually want to clip, as it may change line slope */
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parents: 2910
diff changeset
196 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
197 continue;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
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diff changeset
198 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
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diff changeset
199
3596
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diff changeset
200 /* Draw the end if it was clipped */
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diff changeset
201 draw_end = (x2 != points[i].x || y2 != points[i].y);
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diff changeset
202
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
203 func(dst, x1, y1, x2, y2, color, draw_end);
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diff changeset
204 }
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
diff changeset
205 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.
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parents: 3594
diff changeset
206 SDL_DrawPoint(dst, points[count-1].x, points[count-1].y, color);
3536
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diff changeset
207 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
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diff changeset
208 return 0;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
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diff changeset
209 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
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diff changeset
210
2888
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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parents:
diff changeset
211 /* vi: set ts=4 sw=4 expandtab: */