annotate test/testbitmap.c @ 1022:3d4f1930ed02

*** empty log message ***
author Sam Lantinga <slouken@libsdl.org>
date Tue, 04 Jan 2005 19:04:14 +0000
parents 609543e2b3a1
children be9c9c8f6d53
rev   line source
0
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1
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2 /* Simple program: Test bitmap blits */
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3
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4 #include <stdio.h>
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5 #include <stdlib.h>
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6 #include <string.h>
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7
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8 #include "SDL.h"
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9 #include "picture.xbm"
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10
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11 SDL_Surface *LoadXBM(SDL_Surface *screen, int w, int h, Uint8 *bits)
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12 {
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13 SDL_Surface *bitmap;
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14 Uint8 *line;
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15
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16 /* Allocate the bitmap */
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17 bitmap = SDL_CreateRGBSurface(SDL_SWSURFACE, w, h, 1, 0, 0, 0, 0);
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18 if ( bitmap == NULL ) {
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19 fprintf(stderr, "Couldn't allocate bitmap: %s\n",
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20 SDL_GetError());
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21 return(NULL);
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22 }
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23
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24 /* Copy the pixels */
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25 line = (Uint8 *)bitmap->pixels;
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26 w = (w+7)/8;
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27 while ( h-- ) {
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28 memcpy(line, bits, w);
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29 /* X11 Bitmap images have the bits reversed */
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30 { int i, j; Uint8 *buf, byte;
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31 for ( buf=line, i=0; i<w; ++i, ++buf ) {
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32 byte = *buf;
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33 *buf = 0;
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34 for ( j=7; j>=0; --j ) {
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35 *buf |= (byte&0x01)<<j;
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36 byte >>= 1;
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37 }
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38 }
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39 }
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40 line += bitmap->pitch;
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41 bits += w;
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42 }
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43 return(bitmap);
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44 }
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45
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46 int main(int argc, char *argv[])
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47 {
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48 SDL_Surface *screen;
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49 SDL_Surface *bitmap;
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50 Uint8 video_bpp;
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51 Uint32 videoflags;
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52 Uint8 *buffer;
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53 int i, k, done;
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54 SDL_Event event;
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55 Uint16 *buffer16;
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56 Uint16 color;
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57 Uint8 gradient;
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58 SDL_Color palette[256];
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59
0
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60
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61 /* Initialize SDL */
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62 if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) {
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63 fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
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64 exit(1);
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65 }
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66 atexit(SDL_Quit);
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67
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68 video_bpp = 0;
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69 videoflags = SDL_SWSURFACE;
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70 while ( argc > 1 ) {
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71 --argc;
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72 if ( strcmp(argv[argc-1], "-bpp") == 0 ) {
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73 video_bpp = atoi(argv[argc]);
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74 --argc;
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75 } else
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76 if ( strcmp(argv[argc], "-warp") == 0 ) {
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77 videoflags |= SDL_HWPALETTE;
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78 } else
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79 if ( strcmp(argv[argc], "-hw") == 0 ) {
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80 videoflags |= SDL_HWSURFACE;
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81 } else
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82 if ( strcmp(argv[argc], "-fullscreen") == 0 ) {
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83 videoflags |= SDL_FULLSCREEN;
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84 } else {
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85 fprintf(stderr,
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86 "Usage: %s [-bpp N] [-warp] [-hw] [-fullscreen]\n",
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87 argv[0]);
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88 exit(1);
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89 }
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90 }
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91
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92 /* Set 640x480 video mode */
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93 if ( (screen=SDL_SetVideoMode(640,480,video_bpp,videoflags)) == NULL ) {
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94 fprintf(stderr, "Couldn't set 640x480x%d video mode: %s\n",
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95 video_bpp, SDL_GetError());
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96 exit(2);
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97 }
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98
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99 if (video_bpp==8) {
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100 /* Set a gray colormap, reverse order from white to black */
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101 for ( i=0; i<256; ++i ) {
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102 palette[i].r = 255-i;
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103 palette[i].g = 255-i;
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104 palette[i].b = 255-i;
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105 }
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106 SDL_SetColors(screen, palette, 0, 256);
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107 }
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108
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109 /* Set the surface pixels and refresh! */
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110 if ( SDL_LockSurface(screen) < 0 ) {
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111 fprintf(stderr, "Couldn't lock the display surface: %s\n",
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112 SDL_GetError());
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113 exit(2);
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114 }
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115 buffer=(Uint8 *)screen->pixels;
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116 if (screen->format->BytesPerPixel!=2) {
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117 for ( i=0; i<screen->h; ++i ) {
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118 memset(buffer,(i*255)/screen->h, screen->pitch);
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119 buffer += screen->pitch;
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120 }
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121 }
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122 else
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123 {
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124 for ( i=0; i<screen->h; ++i ) {
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125 gradient=((i*255)/screen->h);
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126 color = SDL_MapRGB(screen->format, gradient, gradient, gradient);
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127 buffer16=(Uint16*)buffer;
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128 for (k=0; k<screen->w; k++)
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129 {
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130 *(buffer16+k)=color;
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131 }
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132 buffer += screen->pitch;
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133 }
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134 }
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135 SDL_UnlockSurface(screen);
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136 SDL_UpdateRect(screen, 0, 0, 0, 0);
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137
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138 /* Load the bitmap */
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139 bitmap = LoadXBM(screen, picture_width, picture_height,
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140 (Uint8 *)picture_bits);
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141 if ( bitmap == NULL ) {
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142 exit(1);
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143 }
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144
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145 /* Wait for a keystroke */
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146 done = 0;
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147 while ( !done ) {
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148 /* Check for events */
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149 while ( SDL_PollEvent(&event) ) {
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150 switch (event.type) {
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151 case SDL_MOUSEBUTTONDOWN: {
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152 SDL_Rect dst;
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153
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154 dst.x = event.button.x - bitmap->w/2;
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155 dst.y = event.button.y - bitmap->h/2;
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156 dst.w = bitmap->w;
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157 dst.h = bitmap->h;
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158 SDL_BlitSurface(bitmap, NULL,
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159 screen, &dst);
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160 SDL_UpdateRects(screen,1,&dst);
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161 }
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162 break;
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163 case SDL_KEYDOWN:
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164 /* Any key press quits the app... */
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165 done = 1;
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166 break;
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167 case SDL_QUIT:
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168 done = 1;
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169 break;
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170 default:
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171 break;
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172 }
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173 }
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174 }
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175 SDL_FreeSurface(bitmap);
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176 return(0);
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177 }