1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
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
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
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
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
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
|
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/keysym.h>
#include "meh.h"
/* Globals */
Display *display;
int screen;
Window window;
GC gc;
static unsigned int getshift(unsigned int mask){
#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
return __builtin_ctz(mask);
#else
int i = 0;
while((mask & 1) == 0){
i++;
mask >>= 1;
}
return i;
#endif
}
XImage *ximage(struct image *img, int width, int height) {
int depth;
XImage *ximg = NULL;
Visual *vis;
unsigned int rshift, gshift, bshift;
int i;
int x,y;
depth = DefaultDepth(display, screen);
vis = DefaultVisual(display, screen);
rshift = getshift(vis->red_mask);
gshift = getshift(vis->green_mask);
bshift = getshift(vis->blue_mask);
if (depth >= 24) {
unsigned int dx;
size_t numNewBufBytes = (4 * width * height);
u_int32_t *newBuf = malloc(numNewBufBytes);
dx = 1024 * img->width / width;
for(y = 0; y < height; y++){
i = (y * img->height / height * img->width) * 1024;
for(x = 0; x < width; x++){
unsigned int r, g, b;
r = (img->buf[(i >> 10)*3] << rshift) & vis->red_mask;
g = (img->buf[(i >> 10)*3+1] << gshift) & vis->green_mask;
b = (img->buf[(i >> 10)*3+2] << bshift) & vis->blue_mask;
newBuf[y * width + x] = r | g | b;
i += dx;
}
}
ximg = XCreateImage (display,
CopyFromParent, depth,
ZPixmap, 0,
(char *) newBuf,
width, height,
32, 0
);
}else if(depth >= 15){
unsigned int dx;
size_t numNewBufBytes = (2 * width * height);
u_int16_t *newBuf = malloc (numNewBufBytes);
dx = 1024 * img->width / width;
for(y = 0; y < height; y++){
i = (y * img->height / height * img->width) * 1024;
for(x = 0; x < width; x++){
unsigned int r, g, b;
r = (img->buf[i++] << rshift) & vis->red_mask;
g = (img->buf[i++] << gshift) & vis->green_mask;
b = (img->buf[i++] << bshift) & vis->blue_mask;
newBuf[y * width + x] = r | g | b;
i += dx;
}
}
ximg = XCreateImage(display,
CopyFromParent, depth,
ZPixmap, 0,
(char *) newBuf,
width, height,
16, 0
);
}else{
fprintf(stderr, "This program does not support displays with a depth less than 15.\n");
exit(1);
return NULL;
}
XInitImage(ximg);
return ximg;
}
void drawimage(struct image *img, int width, int height){
static struct image *lastimg = NULL;
static int lastwidth = 0, lastheight = 0;
static XImage *ximg = NULL;
if(0 && img == lastimg && width == lastwidth && height == lastheight){
}else{
if(ximg)
XDestroyImage(ximg);
lastwidth = width;
lastheight = height;
lastimg = img;
if(width * img->height > height * img->width){
ximg = ximage(img, img->width * height / img->height, height);
}else{
ximg = ximage(img, width, img->height * width / img->width);
}
}
assert(ximg);
{
XRectangle rects[2];
int yoffset, xoffset;
xoffset = (width - ximg->width) / 2;
yoffset = (height - ximg->height) / 2;
if(xoffset || yoffset){
rects[0].x = rects[0].y = 0;
if(xoffset){
rects[0].width = rects[1].width = xoffset;
rects[0].height = rects[1].height = height;
rects[1].x = width-xoffset;
rects[1].y = 0;
}else if(yoffset){
rects[0].width = rects[1].width = width;
rects[0].height = rects[1].height = yoffset;
rects[1].x = 0;
rects[1].y = height - yoffset;
}
XFillRectangles(display, window, gc, rects, 2);
}
XPutImage(display, window, gc, ximg, 0, 0, xoffset, yoffset, ximg->width, ximg->height);
XFlush(display);
}
}
void setaspect(int w, int h){
XSizeHints *hints = XAllocSizeHints();
hints->flags = PAspect;
hints->min_aspect.x = hints->max_aspect.x = w;
hints->min_aspect.y = hints->max_aspect.y = h;
XSetWMNormalHints(display, window, hints);
XFlush(display);
XFree(hints);
}
void xinit(){
display = XOpenDisplay (NULL);
assert(display);
screen = DefaultScreen(display);
window = XCreateWindow(display, DefaultRootWindow(display), 0, 0, 640, 480, 0, DefaultDepth(display, screen), InputOutput, CopyFromParent, 0, NULL);
setaspect(1, 1);
gc = XCreateGC(display, window, 0, NULL);
XMapRaised(display, window);
XSelectInput(display, window, StructureNotifyMask | ExposureMask | KeyPressMask);
XFlush(display);
}
|