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#include <assert.h>
#include <stdio.h>
#include <string.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, unsigned int width, unsigned int height) {
int depth;
XImage *ximg = NULL;
Visual *vis;
unsigned int rshift, gshift, bshift;
unsigned int i;
unsigned int x,y;
unsigned int j = 0;
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 char *ibuf;
unsigned int dx;
size_t numNewBufBytes = ((sizeof(u_int32_t)) * (width) * (height));
u_int32_t *newBuf = malloc(numNewBufBytes);
dx = 1024 * img->width / width;
for(y = 0; y < height; y++){
i = 0;
ibuf = &img->buf[y * img->height / height * img->width * 3];
for(x = 0; x < width; x++){
unsigned int r, g, b;
r = (ibuf[(i >> 10)*3] << rshift) & vis->red_mask;
g = (ibuf[(i >> 10)*3+1] << gshift) & vis->green_mask;
b = (ibuf[(i >> 10)*3+2] << bshift) & vis->blue_mask;
newBuf[j++] = r | g | b;
i += dx;
}
}
ximg = XCreateImage (display,
CopyFromParent, depth,
ZPixmap, 0,
(char *) newBuf,
width, height,
32, 0
);
}else{
/* TODO other depths */
fprintf(stderr, "This program does not support display depths less than 24.\n");
exit(1);
return NULL;
}
XInitImage(ximg);
return ximg;
}
XImage *getimage(struct image *img, int width, int height){
if(width * img->height > height * img->width){
return ximage(img, img->width * height / img->height, height);
}else{
return ximage(img, width, img->height * width / img->width);
}
}
void drawimage(XImage *ximg, unsigned int width, unsigned int height){
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(unsigned int w, unsigned int h){
XSizeHints *hints = XAllocSizeHints();
//hints->flags = PAspect;
hints->flags = 0;
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);
}
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