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annotate src/render/software/SDL_drawline.c @ 5275:7aba0406c273

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Frank Zago to sdl The following patch fixes some of the bitrot for the Nintendo DS port. The support is still basic at the moment, but it allows to run the "general" test under the current head of tree (parent: 5269:11bd1585efb5 tip). Most of the patch is mine, but I integrated a couple changes that John Magnotti posted on Feb 1st.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 12 Feb 2011 11:36:56 -0800
parents b530ef003506
children
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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b530ef003506 Happy 2011! :)
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3 Copyright (C) 1997-2011 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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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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27 #include "SDL_drawline.h"
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28 #include "SDL_drawpoint.h"
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29
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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 }
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87 }
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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 }
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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 }
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119 }
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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
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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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205 func(dst, x1, y1, x2, y2, color, draw_end);
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206 }
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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
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diff changeset
215 /* vi: set ts=4 sw=4 expandtab: */