This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
testbitmap.c
1
2
3
4
5
6
7
8
9
10
/* Simple program: Test bitmap blits */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "SDL.h"
#include "picture.xbm"
11
/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
12
13
static void
quit(int rc)
15
16
SDL_Quit();
exit(rc);
19
20
SDL_Surface *
LoadXBM(SDL_Surface * screen, int w, int h, Uint8 * bits)
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
SDL_Surface *bitmap;
Uint8 *line;
/* Allocate the bitmap */
bitmap = SDL_CreateRGBSurface(SDL_SWSURFACE, w, h, 1, 0, 0, 0, 0);
if (bitmap == NULL) {
fprintf(stderr, "Couldn't allocate bitmap: %s\n", SDL_GetError());
return (NULL);
}
/* Copy the pixels */
line = (Uint8 *) bitmap->pixels;
w = (w + 7) / 8;
while (h--) {
memcpy(line, bits, w);
/* X11 Bitmap images have the bits reversed */
{
int i, j;
Uint8 *buf, byte;
for (buf = line, i = 0; i < w; ++i, ++buf) {
byte = *buf;
*buf = 0;
for (j = 7; j >= 0; --j) {
*buf |= (byte & 0x01) << j;
byte >>= 1;
}
}
}
line += bitmap->pitch;
bits += w;
}
return (bitmap);
54
55
}
56
57
int
main(int argc, char *argv[])
59
60
61
62
63
64
65
66
67
68
69
70
SDL_Surface *screen;
SDL_Surface *bitmap;
Uint8 video_bpp;
Uint32 videoflags;
Uint8 *buffer;
int i, k, done;
SDL_Event event;
Uint16 *buffer16;
Uint16 color;
Uint8 gradient;
SDL_Color palette[256];
71
int video_w, video_h;
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
/* Initialize SDL */
if (SDL_Init(SDL_INIT_VIDEO) < 0) {
fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
return (1);
}
video_bpp = 0;
videoflags = SDL_SWSURFACE;
while (argc > 1) {
--argc;
if (strcmp(argv[argc - 1], "-bpp") == 0) {
video_bpp = atoi(argv[argc]);
--argc;
} else if (strcmp(argv[argc], "-warp") == 0) {
videoflags |= SDL_HWPALETTE;
} else if (strcmp(argv[argc], "-hw") == 0) {
videoflags |= SDL_HWSURFACE;
} else if (strcmp(argv[argc], "-fullscreen") == 0) {
videoflags |= SDL_FULLSCREEN;
} else {
fprintf(stderr,
"Usage: %s [-bpp N] [-warp] [-hw] [-fullscreen]\n",
argv[0]);
quit(1);
100
101
102
103
104
105
106
107
#ifdef __IPHONEOS__
video_w = 320;
video_h = 480;
#else
video_w = 640;
video_h = 480;
#endif
108
/* Set 640x480 video mode */
109
110
if ((screen =
SDL_SetVideoMode(video_w, video_h, video_bpp, videoflags)) == NULL) {
111
fprintf(stderr, "Couldn't set %dx%d %d video mode: %s\n", video_w,
112
video_h, video_bpp, SDL_GetError());
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
quit(2);
}
if (video_bpp == 8) {
/* Set a gray colormap, reverse order from white to black */
for (i = 0; i < 256; ++i) {
palette[i].r = 255 - i;
palette[i].g = 255 - i;
palette[i].b = 255 - i;
}
SDL_SetColors(screen, palette, 0, 256);
}
/* Set the surface pixels and refresh! */
if (SDL_LockSurface(screen) < 0) {
fprintf(stderr, "Couldn't lock the display surface: %s\n",
SDL_GetError());
quit(2);
}
buffer = (Uint8 *) screen->pixels;
if (screen->format->BytesPerPixel != 2) {
for (i = 0; i < screen->h; ++i) {
memset(buffer, (i * 255) / screen->h, screen->pitch);
buffer += screen->pitch;
}
} else {
for (i = 0; i < screen->h; ++i) {
gradient = ((i * 255) / screen->h);
color = SDL_MapRGB(screen->format, gradient, gradient, gradient);
buffer16 = (Uint16 *) buffer;
for (k = 0; k < screen->w; k++) {
*(buffer16 + k) = color;
}
buffer += screen->pitch;
}
}
SDL_UnlockSurface(screen);
SDL_UpdateRect(screen, 0, 0, 0, 0);
/* Load the bitmap */
bitmap = LoadXBM(screen, picture_width, picture_height,
(Uint8 *) picture_bits);
if (bitmap == NULL) {
quit(1);
}
/* Wait for a keystroke */
done = 0;
while (!done) {
/* Check for events */
while (SDL_PollEvent(&event)) {
switch (event.type) {
case SDL_MOUSEBUTTONDOWN:
{
SDL_Rect dst;
dst.x = event.button.x - bitmap->w / 2;
dst.y = event.button.y - bitmap->h / 2;
dst.w = bitmap->w;
dst.h = bitmap->h;
SDL_BlitSurface(bitmap, NULL, screen, &dst);
SDL_UpdateRects(screen, 1, &dst);
}
break;
case SDL_KEYDOWN:
/* Any key press quits the app... */
done = 1;
break;
case SDL_QUIT:
done = 1;
break;
default:
break;
}
188
189
190
191
}
SDL_FreeSurface(bitmap);
SDL_Quit();
return (0);
192
}