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1 #include "dmlib.h"
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2
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3
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4 void dmFillRect(SDL_Surface *screen, int x0, int y0, int x1, int y1, Uint32 col)
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5 {
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6 SDL_Rect rc;
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7 rc.x = x0;
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8 rc.y = y0;
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9 rc.w = x1 - x0 + 1;
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10 rc.h = y1 - y0 + 1;
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11 SDL_FillRect(screen, &rc, col);
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12 }
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13
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14 #define DM_SWAP(T, A, B) { if ((B) < (A)) { T swtmp = (B); B = (A); A = swtmp; } }
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15
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16 void dmDrawHLine(SDL_Surface *screen, int x0, int x1, int yc, const Uint32 col)
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17 {
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18 int x;
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19 const int bpp = screen->format->BytesPerPixel,
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20 cx0 = screen->clip_rect.x, cy0 = screen->clip_rect.y,
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21 cx1 = screen->clip_rect.x + screen->clip_rect.w - 1,
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22 cy1 = screen->clip_rect.y + screen->clip_rect.h - 1;
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23
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24 DM_SWAP(int, x0, x1);
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25 if (yc < cy0|| yc > cy1 || x1 < cx0 || x0 > cx1) return;
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26 if (x0 < cx0) x0 = cx0;
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27 if (x1 > cx1) x1 = cx1;
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28
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29 Uint8 *pix = screen->pixels + yc * screen->pitch + (x0 * bpp);
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30 switch (screen->format->BitsPerPixel)
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31 {
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32 case 8:
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33 for (x = x0; x <= x1; x++)
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34 *pix++ = col;
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35 break;
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36
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37 case 15:
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38 case 16:
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39 {
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40 Uint16 *p = (Uint16 *) pix;
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41 for (x = x0; x <= x1; x++)
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42 *p++ = col;
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43 }
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44 break;
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45
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46 case 24:
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47 for (x = x0; x <= x1; x++)
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48 {
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49 *pix++ = col;
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50 *pix++ = col;
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51 *pix++ = col;
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52 }
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53 break;
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54
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55 case 32:
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56 {
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57 Uint32 *p = (Uint32 *) pix;
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58 for (x = x0; x <= x1; x++)
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59 *p++ = col;
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60 }
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61 break;
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62 }
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63 }
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64
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65
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66 void dmDrawVLine(SDL_Surface *screen, int y0, int y1, int xc, const Uint32 col)
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67 {
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68 int y;
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69 const int bpp = screen->format->BytesPerPixel,
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70 pitch = screen->pitch / bpp,
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71 cx0 = screen->clip_rect.x, cy0 = screen->clip_rect.y,
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72 cx1 = screen->clip_rect.x + screen->clip_rect.w - 1,
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73 cy1 = screen->clip_rect.y + screen->clip_rect.h - 1;
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74
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75 DM_SWAP(int, y0, y1);
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76 if (xc < cx0 || xc > cx1 || y1 < cy0 || y0 > cy1) return;
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77 if (y0 < cy0) y0 = cy0;
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78 if (y1 > cy1) y1 = cy1;
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79
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80 Uint8 *pix = screen->pixels + y0 * screen->pitch + (xc * bpp);
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81 switch (screen->format->BitsPerPixel)
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82 {
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83 case 8:
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84 for (y = y0; y <= y1; y++, pix += pitch)
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85 *pix = col;
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86 break;
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87
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88 case 16:
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89 case 15:
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90 {
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91 Uint16 *p = (Uint16 *) pix;
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92 for (y = y0; y <= y1; y++, p += pitch)
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93 *p = col;
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94 }
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95 break;
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96
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97 case 24:
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98 for (y = y0; y <= y1; y++, pix += pitch)
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99 pix[0] = pix[1] = pix[2] = col;
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100 break;
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101
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102 case 32:
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103 {
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104 Uint32 *p = (Uint32 *) pix;
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105 for (y = y0; y <= y1; y++, p += pitch)
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106 *p = col;
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107 }
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108 break;
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109 }
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110 }
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111
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112
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113 void dmDrawBox3D(SDL_Surface *screen, int x0, int y0, int x1, int y1, Uint32 bgcol, Uint32 ucol, Uint32 dcol)
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114 {
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115 SDL_Rect rc;
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116
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117 rc.x = x0 + 1;
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118 rc.y = y0 + 1;
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119 rc.w = x1 - x0 - 1;
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120 rc.h = y1 - y0 - 1;
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121 SDL_FillRect(screen, &rc, bgcol);
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122
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123 dmDrawHLine(screen, x0 , x1 - 1, y0, ucol);
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124 dmDrawHLine(screen, x0 + 1, x1 , y1, dcol);
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125
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126 dmDrawVLine(screen, y0 , y1 - 1, x0, ucol);
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127 dmDrawVLine(screen, y0 + 1, y1 , x1, dcol);
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128 }
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129
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130
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131 void dmClearSurface(SDL_Surface *screen, const Uint32 col)
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132 {
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133 SDL_FillRect(screen, NULL, col);
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134 }
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135
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136
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137 Uint32 dmMapRGB(SDL_Surface *screen, int r, int g, int b)
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138 {
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139 return SDL_MapRGB(screen->format, r, g, b);
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140 }
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141
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142
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143 Uint32 dmMapRGBA(SDL_Surface *screen, int r, int g, int b, int a)
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144 {
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145 return SDL_MapRGBA(screen->format, r, g, b, a);
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146 }
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147
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148
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149 int dmDirectBlitSurface(SDL_Surface *bmp, SDL_Surface *screen)
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150 {
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151 return SDL_BlitSurface(bmp, NULL, screen, NULL);
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152 }
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