1
2 /* Simple program: Test bitmap blits */
3
4 #include <stdio.h>
5 #include <stdlib.h>
6 #include <string.h>
7
8 #include "SDL.h"
9 #include "picture.xbm"
10
11 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
quit(int rc)12 static void quit(int rc)
13 {
14 SDL_Quit();
15 exit(rc);
16 }
17
LoadXBM(SDL_Surface * screen,int w,int h,Uint8 * bits)18 SDL_Surface *LoadXBM(SDL_Surface *screen, int w, int h, Uint8 *bits)
19 {
20 SDL_Surface *bitmap;
21 Uint8 *line;
22
23 /* Allocate the bitmap */
24 bitmap = SDL_CreateRGBSurface(SDL_SWSURFACE, w, h, 1, 0, 0, 0, 0);
25 if ( bitmap == NULL ) {
26 fprintf(stderr, "Couldn't allocate bitmap: %s\n",
27 SDL_GetError());
28 return(NULL);
29 }
30
31 /* Copy the pixels */
32 line = (Uint8 *)bitmap->pixels;
33 w = (w+7)/8;
34 while ( h-- ) {
35 memcpy(line, bits, w);
36 /* X11 Bitmap images have the bits reversed */
37 { int i, j; Uint8 *buf, byte;
38 for ( buf=line, i=0; i<w; ++i, ++buf ) {
39 byte = *buf;
40 *buf = 0;
41 for ( j=7; j>=0; --j ) {
42 *buf |= (byte&0x01)<<j;
43 byte >>= 1;
44 }
45 }
46 }
47 line += bitmap->pitch;
48 bits += w;
49 }
50 return(bitmap);
51 }
52
main(int argc,char * argv[])53 int main(int argc, char *argv[])
54 {
55 SDL_Surface *screen;
56 SDL_Surface *bitmap;
57 Uint8 video_bpp;
58 Uint32 videoflags;
59 Uint8 *buffer;
60 int i, k, done;
61 SDL_Event event;
62 Uint16 *buffer16;
63 Uint16 color;
64 Uint8 gradient;
65 SDL_Color palette[256];
66
67
68 /* Initialize SDL */
69 if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) {
70 fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
71 return(1);
72 }
73
74 video_bpp = 0;
75 videoflags = SDL_SWSURFACE;
76 while ( argc > 1 ) {
77 --argc;
78 if ( strcmp(argv[argc-1], "-bpp") == 0 ) {
79 video_bpp = atoi(argv[argc]);
80 --argc;
81 } else
82 if ( strcmp(argv[argc], "-warp") == 0 ) {
83 videoflags |= SDL_HWPALETTE;
84 } else
85 if ( strcmp(argv[argc], "-hw") == 0 ) {
86 videoflags |= SDL_HWSURFACE;
87 } else
88 if ( strcmp(argv[argc], "-fullscreen") == 0 ) {
89 videoflags |= SDL_FULLSCREEN;
90 } else {
91 fprintf(stderr,
92 "Usage: %s [-bpp N] [-warp] [-hw] [-fullscreen]\n",
93 argv[0]);
94 quit(1);
95 }
96 }
97
98 /* Set 640x480 video mode */
99 if ( (screen=SDL_SetVideoMode(640,480,video_bpp,videoflags)) == NULL ) {
100 fprintf(stderr, "Couldn't set 640x480x%d video mode: %s\n",
101 video_bpp, SDL_GetError());
102 quit(2);
103 }
104
105 if (video_bpp==8) {
106 /* Set a gray colormap, reverse order from white to black */
107 for ( i=0; i<256; ++i ) {
108 palette[i].r = 255-i;
109 palette[i].g = 255-i;
110 palette[i].b = 255-i;
111 }
112 SDL_SetColors(screen, palette, 0, 256);
113 }
114
115 /* Set the surface pixels and refresh! */
116 if ( SDL_LockSurface(screen) < 0 ) {
117 fprintf(stderr, "Couldn't lock the display surface: %s\n",
118 SDL_GetError());
119 quit(2);
120 }
121 buffer=(Uint8 *)screen->pixels;
122 if (screen->format->BytesPerPixel!=2) {
123 for ( i=0; i<screen->h; ++i ) {
124 memset(buffer,(i*255)/screen->h, screen->pitch);
125 buffer += screen->pitch;
126 }
127 }
128 else
129 {
130 for ( i=0; i<screen->h; ++i ) {
131 gradient=((i*255)/screen->h);
132 color = SDL_MapRGB(screen->format, gradient, gradient, gradient);
133 buffer16=(Uint16*)buffer;
134 for (k=0; k<screen->w; k++)
135 {
136 *(buffer16+k)=color;
137 }
138 buffer += screen->pitch;
139 }
140 }
141 SDL_UnlockSurface(screen);
142 SDL_UpdateRect(screen, 0, 0, 0, 0);
143
144 /* Load the bitmap */
145 bitmap = LoadXBM(screen, picture_width, picture_height,
146 (Uint8 *)picture_bits);
147 if ( bitmap == NULL ) {
148 quit(1);
149 }
150
151 /* Wait for a keystroke */
152 done = 0;
153 while ( !done ) {
154 /* Check for events */
155 while ( SDL_PollEvent(&event) ) {
156 switch (event.type) {
157 case SDL_MOUSEBUTTONDOWN: {
158 SDL_Rect dst;
159
160 dst.x = event.button.x - bitmap->w/2;
161 dst.y = event.button.y - bitmap->h/2;
162 dst.w = bitmap->w;
163 dst.h = bitmap->h;
164 SDL_BlitSurface(bitmap, NULL,
165 screen, &dst);
166 SDL_UpdateRects(screen,1,&dst);
167 }
168 break;
169 case SDL_KEYDOWN:
170 /* Any key press quits the app... */
171 done = 1;
172 break;
173 case SDL_QUIT:
174 done = 1;
175 break;
176 default:
177 break;
178 }
179 }
180 }
181 SDL_FreeSurface(bitmap);
182 SDL_Quit();
183 return(0);
184 }
185