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#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
#include <X11/Xlib.h>
#include <X11/keysym.h>
#include "jpeg.h"
#include "util.h"
Display *display;
int screen;
Window window;
GC gc;
void usage(){
printf("USAGE: meh [FILE1 [FILE2 [...]]]");
exit(1);
}
static int popcount(unsigned long mask){
#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
return __builtin_popcount(mask);
#else
int y;
y = (mask >> 1) &033333333333;
y = mask - y - ((y >>1) & 033333333333);
return (((y + (y >> 3)) & 030707070707) % 077);
#endif
}
unsigned int getshift(unsigned int mask){
return popcount((mask - 1) & ~mask) & 31;
}
XImage *create_image_from_buffer(unsigned char *buf, int width, int height, int bufwidth, int bufheight) {
int depth;
XImage *img = NULL;
Visual *vis;
unsigned int rshift, gshift, bshift;
int outIndex = 0;
int i;
int x,y;
int numBufBytes = (3 * bufwidth * bufheight);
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) {
size_t numNewBufBytes = (4 * (width * height));
u_int32_t *newBuf = malloc(numNewBufBytes);
//for(outIndex = 0; outIndex < width * height; outIndex++){
for(y = 0; y < height; y++){
for(x = 0; x < width; x++){
unsigned int r, g, b;
i = (y * bufheight / height * bufwidth + x * bufwidth / width) * 3;
assert(i < numBufBytes);
r = (buf[i++] << rshift) & vis->red_mask;
g = (buf[i++] << gshift) & vis->green_mask;
b = (buf[i++] << bshift) & vis->blue_mask;
newBuf[y * width + x] = r | g | b;
}
}
img = XCreateImage (display,
CopyFromParent, depth,
ZPixmap, 0,
(char *) newBuf,
width, height,
32, 0
);
} else if (depth >= 15) {
exit(1);
size_t numNewBufBytes = (2 * (width * height));
u_int16_t *newBuf = malloc (numNewBufBytes);
for (i = 0; i < numBufBytes;) {
unsigned int r, g, b;
r = (buf[i++] << rshift) & vis->red_mask;
g = (buf[i++] << gshift) & vis->green_mask;
b = (buf[i++] << bshift) & vis->blue_mask;
newBuf[outIndex++] = r | g | b;
}
img = 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.");
exit(1);
return NULL;
}
XInitImage (img);
return img;
}
void init(){
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);
gc = XCreateGC(display, window, 0, NULL);
XMapRaised(display, window);
XSelectInput(display, window, StructureNotifyMask | ExposureMask | KeyPressMask);
XFlush(display);
}
void run(char *images[], int length){
int i = 0;
int bufwidth, bufheight;
int width = 0, height = 0;
XImage *img = NULL;
unsigned char *buf = NULL;
int redraw = 0;
for(;;){
XEvent event;
XNextEvent(display, &event);
switch(event.type){
case MapNotify:
printf("MapNotify\n");
break;
case ConfigureNotify:
printf("ConfigureNotify(%i, %i, %i, %i)\n", event.xconfigure.x, event.xconfigure.y, event.xconfigure.width, event.xconfigure.height);
if(width != event.xconfigure.width || height != event.xconfigure.height){
if(img)
free(img);
img = NULL;
width = event.xconfigure.width;
height = event.xconfigure.height;
}
break;
case Expose:
redraw = 1;
break;
case KeyPress:
switch(XLookupKeysym(&event.xkey, 0)){
case XK_Escape:
exit(0);
break;
case XK_q:
exit(0);
break;
case XK_t:
i = (i + 1) % length;
if(img)
free(img);
if(buf)
free(buf);
img = NULL;
buf = NULL;
redraw = 1;
break;
case XK_n:
i = i ? i - 1 : length - 1;
if(img)
free(img);
if(buf)
free(buf);
img = NULL;
buf = NULL;
redraw = 1;
break;
}
break;
}
if(redraw){
if(!buf)
buf = loadjpeg(images[i], &bufwidth, &bufheight);
assert(buf);
if(!img)
img = create_image_from_buffer(buf, width, height, bufwidth, bufheight);
assert(img);
XPutImage(display, window, gc, img, 0, 0, 0, 0, width, height);
XFlush(display);
redraw = 0;
}
}
}
int main(int argc, char *argv[]){
if(argc < 2)
usage();
init();
run(&argv[1], argc - 1);
return 0;
}
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