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annotate test/testbitmap.c @ 1698:412149a1c756 SDL-1.3

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Renamed, per Mike's comment on bug #157
author Sam Lantinga <slouken@libsdl.org>
date Wed, 21 Jun 2006 08:25:17 +0000
parents 4da1ee79c9af
children
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 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
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12 static void
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13 quit(int rc)
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14 {
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15 SDL_Quit();
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16 exit(rc);
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17 }
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18
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19 SDL_Surface *
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20 LoadXBM(SDL_Surface * screen, int w, int h, Uint8 * bits)
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21 {
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22 SDL_Surface *bitmap;
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23 Uint8 *line;
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24
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25 /* Allocate the bitmap */
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26 bitmap = SDL_CreateRGBSurface(SDL_SWSURFACE, w, h, 1, 0, 0, 0, 0);
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27 if (bitmap == NULL) {
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28 fprintf(stderr, "Couldn't allocate bitmap: %s\n", SDL_GetError());
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29 return (NULL);
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30 }
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31
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32 /* Copy the pixels */
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33 line = (Uint8 *) bitmap->pixels;
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34 w = (w + 7) / 8;
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35 while (h--) {
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36 memcpy(line, bits, w);
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37 /* X11 Bitmap images have the bits reversed */
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38 {
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39 int i, j;
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40 Uint8 *buf, byte;
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41 for (buf = line, i = 0; i < w; ++i, ++buf) {
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42 byte = *buf;
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43 *buf = 0;
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44 for (j = 7; j >= 0; --j) {
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45 *buf |= (byte & 0x01) << j;
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46 byte >>= 1;
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47 }
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48 }
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49 }
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50 line += bitmap->pitch;
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51 bits += w;
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52 }
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53 return (bitmap);
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54 }
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55
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56 int
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57 main(int argc, char *argv[])
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58 {
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59 SDL_Surface *screen;
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60 SDL_Surface *bitmap;
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61 Uint8 video_bpp;
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62 Uint32 videoflags;
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63 Uint8 *buffer;
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64 int i, k, done;
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65 SDL_Event event;
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66 Uint16 *buffer16;
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67 Uint16 color;
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68 Uint8 gradient;
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69 SDL_Color palette[256];
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71
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72 /* Initialize SDL */
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73 if (SDL_Init(SDL_INIT_VIDEO) < 0) {
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74 fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
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75 return (1);
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76 }
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77
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78 video_bpp = 0;
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79 videoflags = SDL_SWSURFACE;
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80 while (argc > 1) {
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81 --argc;
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82 if (strcmp(argv[argc - 1], "-bpp") == 0) {
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83 video_bpp = atoi(argv[argc]);
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84 --argc;
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85 } else if (strcmp(argv[argc], "-warp") == 0) {
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86 videoflags |= SDL_HWPALETTE;
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87 } else if (strcmp(argv[argc], "-hw") == 0) {
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88 videoflags |= SDL_HWSURFACE;
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89 } else if (strcmp(argv[argc], "-fullscreen") == 0) {
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90 videoflags |= SDL_FULLSCREEN;
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91 } else {
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92 fprintf(stderr,
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93 "Usage: %s [-bpp N] [-warp] [-hw] [-fullscreen]\n",
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94 argv[0]);
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95 quit(1);
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96 }
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97 }
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98
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99 /* Set 640x480 video mode */
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100 if ((screen = SDL_SetVideoMode(640, 480, video_bpp, videoflags)) == NULL) {
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101 fprintf(stderr, "Couldn't set 640x480x%d video mode: %s\n",
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102 video_bpp, SDL_GetError());
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103 quit(2);
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104 }
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105
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106 if (video_bpp == 8) {
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107 /* Set a gray colormap, reverse order from white to black */
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108 for (i = 0; i < 256; ++i) {
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109 palette[i].r = 255 - i;
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110 palette[i].g = 255 - i;
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111 palette[i].b = 255 - i;
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112 }
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113 SDL_SetColors(screen, palette, 0, 256);
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114 }
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115
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116 /* Set the surface pixels and refresh! */
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117 if (SDL_LockSurface(screen) < 0) {
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118 fprintf(stderr, "Couldn't lock the display surface: %s\n",
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119 SDL_GetError());
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120 quit(2);
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121 }
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122 buffer = (Uint8 *) screen->pixels;
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123 if (screen->format->BytesPerPixel != 2) {
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124 for (i = 0; i < screen->h; ++i) {
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125 memset(buffer, (i * 255) / screen->h, screen->pitch);
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126 buffer += screen->pitch;
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127 }
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128 } else {
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129 for (i = 0; i < screen->h; ++i) {
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130 gradient = ((i * 255) / screen->h);
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131 color = SDL_MapRGB(screen->format, gradient, gradient, gradient);
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132 buffer16 = (Uint16 *) buffer;
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133 for (k = 0; k < screen->w; k++) {
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134 *(buffer16 + k) = color;
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135 }
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136 buffer += screen->pitch;
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137 }
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138 }
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139 SDL_UnlockSurface(screen);
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140 SDL_UpdateRect(screen, 0, 0, 0, 0);
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141
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142 /* Load the bitmap */
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143 bitmap = LoadXBM(screen, picture_width, picture_height,
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144 (Uint8 *) picture_bits);
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145 if (bitmap == NULL) {
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146 quit(1);
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147 }
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148
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149 /* Wait for a keystroke */
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150 done = 0;
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151 while (!done) {
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152 /* Check for events */
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153 while (SDL_PollEvent(&event)) {
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154 switch (event.type) {
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155 case SDL_MOUSEBUTTONDOWN:
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156 {
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157 SDL_Rect dst;
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158
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159 dst.x = event.button.x - bitmap->w / 2;
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160 dst.y = event.button.y - bitmap->h / 2;
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161 dst.w = bitmap->w;
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162 dst.h = bitmap->h;
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163 SDL_BlitSurface(bitmap, NULL, screen, &dst);
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164 SDL_UpdateRects(screen, 1, &dst);
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165 }
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166 break;
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167 case SDL_KEYDOWN:
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168 /* Any key press quits the app... */
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169 done = 1;
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170 break;
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171 case SDL_QUIT:
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172 done = 1;
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173 break;
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174 default:
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175 break;
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176 }
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177 }
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178 }
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179 SDL_FreeSurface(bitmap);
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180 SDL_Quit();
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181 return (0);
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182 }