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annotate src/render/software/SDL_drawline.c @ 5231:710d00cb3a6a

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Made it possible to disable the rendering subsystem with configure --disable-render
author Sam Lantinga <slouken@libsdl.org>
date Tue, 08 Feb 2011 10:04:09 -0800
parents 4d39eeaad00b
children b530ef003506
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
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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.
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
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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
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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21 */
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22 #include "SDL_config.h"
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23
5231
710d00cb3a6a Made it possible to disable the rendering subsystem with configure --disable-render
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24 #if !SDL_RENDER_DISABLED
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25
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e40448bc7727 Share code between fill and line drawing
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26 #include "SDL_draw.h"
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d72793305335 Making the API simpler, moved the surface drawing functions to the software renderer.
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27 #include "SDL_drawline.h"
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28 #include "SDL_drawpoint.h"
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29
2890
1863c8b59658 Placeholder for line drawing algorithm (current code doesn't work)
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30
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31 static void
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32 SDL_DrawLine1(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color,
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33 SDL_bool draw_end)
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34 {
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35 if (y1 == y2) {
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36 //HLINE(Uint8, DRAW_FASTSETPIXEL1, draw_end);
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37 int length;
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38 int pitch = (dst->pitch / dst->format->BytesPerPixel);
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39 Uint8 *pixel;
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40 if (x1 <= x2) {
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41 pixel = (Uint8 *)dst->pixels + y1 * pitch + x1;
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42 length = draw_end ? (x2-x1+1) : (x2-x1);
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43 } else {
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44 pixel = (Uint8 *)dst->pixels + y1 * pitch + x2;
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45 if (!draw_end) {
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46 ++pixel;
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47 }
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48 length = draw_end ? (x1-x2+1) : (x1-x2);
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49 }
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50 SDL_memset(pixel, color, length);
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51 } else if (x1 == x2) {
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52 VLINE(Uint8, DRAW_FASTSETPIXEL1, draw_end);
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53 } else if (ABS(x1 - x2) == ABS(y1 - y2)) {
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54 DLINE(Uint8, DRAW_FASTSETPIXEL1, draw_end);
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55 } else {
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56 BLINE(x1, y1, x2, y2, DRAW_FASTSETPIXELXY1, draw_end);
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57 }
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58 }
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59
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60 static void
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61 SDL_DrawLine2(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color,
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62 SDL_bool draw_end)
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63 {
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64 if (y1 == y2) {
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65 HLINE(Uint16, DRAW_FASTSETPIXEL2, draw_end);
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66 } else if (x1 == x2) {
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67 VLINE(Uint16, DRAW_FASTSETPIXEL2, draw_end);
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68 } else if (ABS(x1 - x2) == ABS(y1 - y2)) {
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69 DLINE(Uint16, DRAW_FASTSETPIXEL2, draw_end);
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70 } else {
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71 Uint8 _r, _g, _b, _a;
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72 const SDL_PixelFormat * fmt = dst->format;
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73 SDL_GetRGBA(color, fmt, &_r, &_g, &_b, &_a);
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74 if (fmt->Rmask == 0x7C00) {
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75 AALINE(x1, y1, x2, y2,
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76 DRAW_FASTSETPIXELXY2, DRAW_SETPIXELXY_BLEND_RGB555,
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77 draw_end);
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78 } else if (fmt->Rmask == 0xF800) {
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79 AALINE(x1, y1, x2, y2,
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80 DRAW_FASTSETPIXELXY2, DRAW_SETPIXELXY_BLEND_RGB565,
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81 draw_end);
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82 } else {
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83 AALINE(x1, y1, x2, y2,
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84 DRAW_FASTSETPIXELXY2, DRAW_SETPIXELXY2_BLEND_RGB,
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85 draw_end);
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86 }
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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87 }
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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88 }
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89
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90 static void
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91 SDL_DrawLine4(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color,
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92 SDL_bool draw_end)
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93 {
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94 if (y1 == y2) {
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95 HLINE(Uint32, DRAW_FASTSETPIXEL4, draw_end);
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96 } else if (x1 == x2) {
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97 VLINE(Uint32, DRAW_FASTSETPIXEL4, draw_end);
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98 } else if (ABS(x1 - x2) == ABS(y1 - y2)) {
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99 DLINE(Uint32, DRAW_FASTSETPIXEL4, draw_end);
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100 } else {
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101 Uint8 _r, _g, _b, _a;
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102 const SDL_PixelFormat * fmt = dst->format;
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103 SDL_GetRGBA(color, fmt, &_r, &_g, &_b, &_a);
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104 if (fmt->Rmask == 0x00FF0000) {
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105 if (!fmt->Amask) {
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106 AALINE(x1, y1, x2, y2,
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107 DRAW_FASTSETPIXELXY4, DRAW_SETPIXELXY_BLEND_RGB888,
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108 draw_end);
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109 } else {
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110 AALINE(x1, y1, x2, y2,
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111 DRAW_FASTSETPIXELXY4, DRAW_SETPIXELXY_BLEND_ARGB8888,
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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 } else {
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115 AALINE(x1, y1, x2, y2,
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116 DRAW_FASTSETPIXELXY4, DRAW_SETPIXELXY4_BLEND_RGB,
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117 draw_end);
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118 }
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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119 }
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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120 }
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121
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122 typedef void (*DrawLineFunc) (SDL_Surface * dst,
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123 int x1, int y1, int x2, int y2,
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124 Uint32 color, SDL_bool draw_end);
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125
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126 static DrawLineFunc
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127 SDL_CalculateDrawLineFunc(const SDL_PixelFormat * fmt)
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128 {
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129 switch (fmt->BytesPerPixel) {
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130 case 1:
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131 if (fmt->BitsPerPixel < 8) {
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132 break;
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133 }
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134 return SDL_DrawLine1;
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135 case 2:
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136 return SDL_DrawLine2;
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137 case 4:
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138 return SDL_DrawLine4;
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139 }
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140 return NULL;
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141 }
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142
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143 int
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144 SDL_DrawLine(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color)
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145 {
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146 DrawLineFunc func;
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147
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148 if (!dst) {
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149 SDL_SetError("SDL_DrawLine(): Passed NULL destination surface");
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150 return -1;
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151 }
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152
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153 func = SDL_CalculateDrawLineFunc(dst->format);
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154 if (!func) {
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155 SDL_SetError("SDL_DrawLine(): Unsupported surface format");
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156 return -1;
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157 }
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158
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159 /* Perform clipping */
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160 /* FIXME: We don't actually want to clip, as it may change line slope */
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161 if (!SDL_IntersectRectAndLine(&dst->clip_rect, &x1, &y1, &x2, &y2)) {
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162 return 0;
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163 }
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164
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165 func(dst, x1, y1, x2, y2, color, SDL_TRUE);
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166 return 0;
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167 }
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168
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169 int
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170 SDL_DrawLines(SDL_Surface * dst, const SDL_Point * points, int count,
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171 Uint32 color)
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172 {
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173 int i;
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174 int x1, y1;
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175 int x2, y2;
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176 SDL_bool draw_end;
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177 DrawLineFunc func;
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178
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179 if (!dst) {
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180 SDL_SetError("SDL_DrawLines(): Passed NULL destination surface");
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181 return -1;
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182 }
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183
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184 func = SDL_CalculateDrawLineFunc(dst->format);
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185 if (!func) {
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186 SDL_SetError("SDL_DrawLines(): Unsupported surface format");
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187 return -1;
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188 }
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189
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190 for (i = 1; i < count; ++i) {
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191 x1 = points[i-1].x;
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192 y1 = points[i-1].y;
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193 x2 = points[i].x;
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194 y2 = points[i].y;
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195
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196 /* Perform clipping */
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197 /* FIXME: We don't actually want to clip, as it may change line slope */
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diff changeset
198 if (!SDL_IntersectRectAndLine(&dst->clip_rect, &x1, &y1, &x2, &y2)) {
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diff changeset
199 continue;
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200 }
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diff changeset
201
3596
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202 /* Draw the end if it was clipped */
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203 draw_end = (x2 != points[i].x || y2 != points[i].y);
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204
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diff changeset
205 func(dst, x1, y1, x2, y2, color, draw_end);
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diff changeset
206 }
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
207 if (points[0].x != points[count-1].x || points[0].y != points[count-1].y) {
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diff changeset
208 SDL_DrawPoint(dst, points[count-1].x, points[count-1].y, color);
3536
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diff changeset
209 }
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diff changeset
210 return 0;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
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diff changeset
211 }
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diff changeset
212
5231
710d00cb3a6a Made it possible to disable the rendering subsystem with configure --disable-render
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diff changeset
213 #endif /* !SDL_RENDER_DISABLED */
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diff changeset
214
2888
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diff changeset
215 /* vi: set ts=4 sw=4 expandtab: */