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/* Copyright (C) 2018 C. McEnroe <june@causal.agency>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <X11/Xlib.h>
#include <err.h>
#include <sysexits.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdbool.h>
#include "gfx.h"
static size_t width = 800;
static size_t height = 600;
static Display *display;
static Window window;
static Atom WM_DELETE_WINDOW;
static GC windowGc;
static XImage *image;
static size_t bufSize;
static uint32_t *buf;
static size_t pixmapWidth;
static size_t pixmapHeight;
static Pixmap pixmap;
static void createWindow(void) {
display = XOpenDisplay(NULL);
if (!display) errx(EX_UNAVAILABLE, "XOpenDisplay: %s", XDisplayName(NULL));
Window root = DefaultRootWindow(display);
window = XCreateSimpleWindow(display, root, 0, 0, width, height, 0, 0, 0);
WM_DELETE_WINDOW = XInternAtom(display, "WM_DELETE_WINDOW", false);
XSetWMProtocols(display, window, &WM_DELETE_WINDOW, 1);
windowGc = XCreateGC(display, window, 0, NULL);
image = XCreateImage(display, NULL, 24, ZPixmap, 0, NULL, width, height, 32, 0);
}
static void resizePixmap(void) {
size_t newSize = 4 * width * height;
if (newSize > bufSize) {
bufSize = newSize;
free(buf);
buf = malloc(bufSize);
if (!buf) err(EX_OSERR, "malloc(%zu)", bufSize);
}
image->data = (char *)buf;
image->width = width;
image->height = height;
image->bytes_per_line = 4 * width;
if (width > pixmapWidth || height > pixmapHeight) {
pixmapWidth = width;
pixmapHeight = height;
if (pixmap) XFreePixmap(display, pixmap);
pixmap = XCreatePixmap(display, window, pixmapWidth, pixmapHeight, 24);
}
}
static void drawWindow(void) {
draw(buf, width, height);
XPutImage(display, pixmap, windowGc, image, 0, 0, 0, 0, width, height);
XCopyArea(display, pixmap, window, windowGc, 0, 0, width, height, 0, 0);
}
int main(int argc, char *argv[]) {
int error = init(argc, argv);
if (error) return error;
createWindow();
resizePixmap();
drawWindow();
XStoreName(display, window, status());
XMapWindow(display, window);
XEvent event;
XSelectInput(display, window, ExposureMask | StructureNotifyMask | KeyPressMask);
for (;;) {
XNextEvent(display, &event);
switch (event.type) {
case KeyPress: {
XKeyEvent key = event.xkey;
KeySym sym = XLookupKeysym(&key, key.state & ShiftMask);
if (sym > 0x80) break;
if (!input(sym)) return EX_OK;
drawWindow();
XStoreName(display, window, status());
} break;
case ConfigureNotify: {
XConfigureEvent configure = event.xconfigure;
width = configure.width;
height = configure.height;
resizePixmap();
drawWindow();
} break;
case Expose: {
XExposeEvent expose = event.xexpose;
XCopyArea(
display, pixmap, window, windowGc,
expose.x, expose.y,
expose.width, expose.height,
expose.x, expose.y
);
} break;
case ClientMessage: {
XClientMessageEvent client = event.xclient;
if ((Atom)client.data.l[0] == WM_DELETE_WINDOW) return EX_OK;
} break;
}
}
}
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