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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 <X11/extensions/XShm.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include "meh.h"
/* Globals */
Display *display;
int screen;
Window window;
GC gc;
int xshm = 0;
XShmSegmentInfo *shminfo;
XImage *ximage(struct image *img, unsigned int width, unsigned int height, int fast){
int depth;
XImage *ximg = NULL;
Visual *vis;
depth = DefaultDepth(display, screen);
vis = DefaultVisual(display, screen);
if(depth >= 24){
if(xshm){
shminfo = malloc(sizeof(XShmSegmentInfo));
if(!(ximg = XShmCreateImage(display,
CopyFromParent, depth,
ZPixmap,
NULL,
shminfo,
width, height
))){
fprintf(stderr, "XShm problems\n");
exit(1);
}
if((shminfo->shmid = shmget(IPC_PRIVATE, ximg->bytes_per_line * ximg->height, IPC_CREAT|0777)) == -1){
fprintf(stderr, "XShm problems\n");
exit(1);
}
if((shminfo->shmaddr = ximg->data = shmat(shminfo->shmid, 0, 0)) == (void *)-1){
fprintf(stderr, "XShm problems\n");
exit(1);
}
shminfo->readOnly = False;
if(!XShmAttach(display, shminfo)){
fprintf(stderr, "XShm problems, falling back to to XImage\n");
xshm = 0;
}
}
if(!xshm){
ximg = XCreateImage(display,
CopyFromParent, depth,
ZPixmap, 0,
NULL,
width, height,
32, 0
);
ximg->data = malloc(ximg->bytes_per_line * ximg->height);
XInitImage(ximg);
}
(fast ? nearestscale : scale)(img, ximg->width, ximg->height, ximg->bytes_per_line, ximg->data);
}else{
/* TODO other depths */
fprintf(stderr, "This program does not yet support display depths <24.\n");
exit(1);
return NULL;
}
return ximg;
}
XImage *getimage(struct image *img, unsigned int width, unsigned int height, int fast){
if(width * img->bufheight > height * img->bufwidth){
return ximage(img, img->bufwidth * height / img->bufheight, height, fast);
}else{
return ximage(img, width, img->bufheight * width / img->bufwidth, fast);
}
}
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 = xoffset + ximg->width;
rects[1].y = 0;
rects[1].width = width - rects[1].x;
}else if(yoffset){
rects[0].width = rects[1].width = width;
rects[0].height = yoffset;
rects[1].x = 0;
rects[1].y = yoffset + ximg->height;
rects[1].height = height - rects[1].y;
}
XFillRectangles(display, window, gc, rects, 2);
}
if(xshm){
XShmPutImage(display, window, gc, ximg, 0, 0, xoffset, yoffset, ximg->width, ximg->height, False);
}else{
XPutImage(display, window, gc, ximg, 0, 0, xoffset, yoffset, ximg->width, ximg->height);
}
XFlush(display);
}
void freeXImg(XImage *ximg){
if(xshm){
XShmDetach(display, shminfo);
XDestroyImage(ximg);
shmdt(shminfo->shmaddr);
shmctl(shminfo->shmid, IPC_RMID, 0);
free(shminfo);
}else{
XDestroyImage(ximg);
}
}
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);
}
/* Alt-F4 silent. Keeps people happy */
int xquit(Display *d){
(void)d;
exit(EXIT_SUCCESS);
return 0;
}
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);
XSetIOErrorHandler(xquit);
XFlush(display);
}
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