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#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(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);
}
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