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Nuklear/demo/x11_rawfb/nuklear_xlib.h
b-aaz fb474874db Added required includes to the platform headers . 
Added missing include decelerations and in one case removed an unnecessary
one form the platform headers in the demo/ directory .
2024-01-20 16:16:45 +03:30

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/*
* MIT License
*
* Copyright (c) 2016-2017 Patrick Rudolph <siro@das-labor.org>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Based on x11/nuklear_xlib.h.
*/
/*
* ==============================================================
*
* API
*
* ===============================================================
*/
#ifndef NK_XLIBSHM_H_
#define NK_XLIBSHM_H_
#include <X11/Xlib.h>
NK_API int nk_xlib_init(Display *dpy, Visual *vis, int screen, Window root, unsigned int w, unsigned int h, void **fb, rawfb_pl *pl);
NK_API int nk_xlib_handle_event(Display *dpy, int screen, Window win, XEvent *evt, struct rawfb_context *rawfb);
NK_API void nk_xlib_render(Drawable screen);
NK_API void nk_xlib_shutdown(void);
#endif
/*
* ==============================================================
*
* IMPLEMENTATION
*
* ===============================================================
*/
#ifdef NK_XLIBSHM_IMPLEMENTATION
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xresource.h>
#include <X11/Xlocale.h>
#include <X11/extensions/XShm.h>
#include <sys/ipc.h>
#include <sys/shm.h>
static struct {
struct nk_context ctx;
struct XSurface *surf;
Cursor cursor;
Display *dpy;
Window root;
XImage *ximg;
XShmSegmentInfo xsi;
char fallback;
GC gc;
} xlib;
NK_API int
nk_xlib_init(Display *dpy, Visual *vis, int screen, Window root,
unsigned int w, unsigned int h, void **fb, rawfb_pl *pl)
{
unsigned int depth = XDefaultDepth(dpy, screen);
xlib.dpy = dpy;
xlib.root = root;
if (!setlocale(LC_ALL,"")) return 0;
if (!XSupportsLocale()) return 0;
if (!XSetLocaleModifiers("@im=none")) return 0;
/* create invisible cursor */
{static XColor dummy; char data[1] = {0};
Pixmap blank = XCreateBitmapFromData(dpy, root, data, 1, 1);
if (blank == None) return 0;
xlib.cursor = XCreatePixmapCursor(dpy, blank, blank, &dummy, &dummy, 0, 0);
XFreePixmap(dpy, blank);}
xlib.fallback = False;
do {/* Initialize shared memory according to:
* https://www.x.org/archive/X11R7.5/doc/Xext/mit-shm.html */
int status;
if (!XShmQueryExtension(dpy)) {
printf("No XShm Extension available.\n");
xlib.fallback = True;
break;
}
xlib.ximg = XShmCreateImage(dpy, vis, depth, ZPixmap, NULL, &xlib.xsi, w, h);
if (!xlib.ximg) {
xlib.fallback = True;
break;
}
xlib.xsi.shmid = shmget(IPC_PRIVATE, xlib.ximg->bytes_per_line * xlib.ximg->height, IPC_CREAT | 0777);
if (xlib.xsi.shmid < 0) {
XDestroyImage(xlib.ximg);
xlib.fallback = True;
break;
}
xlib.xsi.shmaddr = xlib.ximg->data = shmat(xlib.xsi.shmid, NULL, 0);
if ((intptr_t)xlib.xsi.shmaddr < 0) {
XDestroyImage(xlib.ximg);
xlib.fallback = True;
break;
}
xlib.xsi.readOnly = False;
status = XShmAttach(dpy, &xlib.xsi);
if (!status) {
shmdt(xlib.xsi.shmaddr);
XDestroyImage(xlib.ximg);
xlib.fallback = True;
break;
} XSync(dpy, False);
shmctl(xlib.xsi.shmid, IPC_RMID, NULL);
} while(0);
if (xlib.fallback) {
xlib.ximg = XCreateImage(dpy, vis, depth, ZPixmap, 0, NULL, w, h, 32, 0);
if (!xlib.ximg) return 0;
xlib.ximg->data = malloc(h * xlib.ximg->bytes_per_line);
if (!xlib.ximg->data)
return 0;
}
xlib.gc = XDefaultGC(dpy, screen);
*fb = xlib.ximg->data;
if (xlib.ximg->red_mask == 0xff0000 &&
xlib.ximg->green_mask == 0xff00 &&
xlib.ximg->blue_mask == 0xff &&
xlib.ximg->bits_per_pixel == 32) {
*pl = PIXEL_LAYOUT_XRGB_8888;
}
else if (xlib.ximg->red_mask == 0xff000000 &&
xlib.ximg->green_mask == 0xff0000 &&
xlib.ximg->blue_mask == 0xff00 &&
xlib.ximg->bits_per_pixel == 32) {
*pl = PIXEL_LAYOUT_RGBX_8888;
}
else {
perror("nk_xlib_init(): Unrecognized pixel layout.\n");
return 0;
}
return 1;
}
NK_API int
nk_xlib_handle_event(Display *dpy, int screen, Window win, XEvent *evt, struct rawfb_context *rawfb)
{
/* optional grabbing behavior */
if (rawfb->ctx.input.mouse.grab) {
/* XDefineCursor(xlib.dpy, xlib.root, xlib.cursor); */
rawfb->ctx.input.mouse.grab = 0;
} else if (rawfb->ctx.input.mouse.ungrab) {
XWarpPointer(xlib.dpy, None, xlib.root, 0, 0, 0, 0,
(int)rawfb->ctx.input.mouse.prev.x, (int)rawfb->ctx.input.mouse.prev.y);
/* XUndefineCursor(xlib.dpy, xlib.root); */
rawfb->ctx.input.mouse.ungrab = 0;
}
if (evt->type == KeyPress || evt->type == KeyRelease)
{
/* Key handler */
int ret, down = (evt->type == KeyPress);
KeySym *code = XGetKeyboardMapping(xlib.dpy, (KeyCode)evt->xkey.keycode, 1, &ret);
if (*code == XK_Shift_L || *code == XK_Shift_R) nk_input_key(&rawfb->ctx, NK_KEY_SHIFT, down);
else if (*code == XK_Control_L || *code == XK_Control_R) nk_input_key(&rawfb->ctx, NK_KEY_CTRL, down);
else if (*code == XK_Delete) nk_input_key(&rawfb->ctx, NK_KEY_DEL, down);
else if (*code == XK_Return) nk_input_key(&rawfb->ctx, NK_KEY_ENTER, down);
else if (*code == XK_Tab) nk_input_key(&rawfb->ctx, NK_KEY_TAB, down);
else if (*code == XK_Left) nk_input_key(&rawfb->ctx, NK_KEY_LEFT, down);
else if (*code == XK_Right) nk_input_key(&rawfb->ctx, NK_KEY_RIGHT, down);
else if (*code == XK_Up) nk_input_key(&rawfb->ctx, NK_KEY_UP, down);
else if (*code == XK_Down) nk_input_key(&rawfb->ctx, NK_KEY_DOWN, down);
else if (*code == XK_BackSpace) nk_input_key(&rawfb->ctx, NK_KEY_BACKSPACE, down);
else if (*code == XK_Escape) nk_input_key(&rawfb->ctx, NK_KEY_TEXT_RESET_MODE, down);
else if (*code == XK_Page_Up) nk_input_key(&rawfb->ctx, NK_KEY_SCROLL_UP, down);
else if (*code == XK_Page_Down) nk_input_key(&rawfb->ctx, NK_KEY_SCROLL_DOWN, down);
else if (*code == XK_Home) {
nk_input_key(&rawfb->ctx, NK_KEY_TEXT_START, down);
nk_input_key(&rawfb->ctx, NK_KEY_SCROLL_START, down);
} else if (*code == XK_End) {
nk_input_key(&rawfb->ctx, NK_KEY_TEXT_END, down);
nk_input_key(&rawfb->ctx, NK_KEY_SCROLL_END, down);
} else {
if (*code == 'c' && (evt->xkey.state & ControlMask))
nk_input_key(&rawfb->ctx, NK_KEY_COPY, down);
else if (*code == 'v' && (evt->xkey.state & ControlMask))
nk_input_key(&rawfb->ctx, NK_KEY_PASTE, down);
else if (*code == 'x' && (evt->xkey.state & ControlMask))
nk_input_key(&rawfb->ctx, NK_KEY_CUT, down);
else if (*code == 'z' && (evt->xkey.state & ControlMask))
nk_input_key(&rawfb->ctx, NK_KEY_TEXT_UNDO, down);
else if (*code == 'r' && (evt->xkey.state & ControlMask))
nk_input_key(&rawfb->ctx, NK_KEY_TEXT_REDO, down);
else if (*code == XK_Left && (evt->xkey.state & ControlMask))
nk_input_key(&rawfb->ctx, NK_KEY_TEXT_WORD_LEFT, down);
else if (*code == XK_Right && (evt->xkey.state & ControlMask))
nk_input_key(&rawfb->ctx, NK_KEY_TEXT_WORD_RIGHT, down);
else if (*code == 'b' && (evt->xkey.state & ControlMask))
nk_input_key(&rawfb->ctx, NK_KEY_TEXT_LINE_START, down);
else if (*code == 'e' && (evt->xkey.state & ControlMask))
nk_input_key(&rawfb->ctx, NK_KEY_TEXT_LINE_END, down);
else {
if (*code == 'i')
nk_input_key(&rawfb->ctx, NK_KEY_TEXT_INSERT_MODE, down);
else if (*code == 'r')
nk_input_key(&rawfb->ctx, NK_KEY_TEXT_REPLACE_MODE, down);
if (down) {
char buf[32];
KeySym keysym = 0;
if (XLookupString((XKeyEvent*)evt, buf, 32, &keysym, NULL) != NoSymbol)
nk_input_glyph(&rawfb->ctx, buf);
}
}
} XFree(code);
return 1;
} else if (evt->type == ButtonPress || evt->type == ButtonRelease) {
/* Button handler */
int down = (evt->type == ButtonPress);
const int x = evt->xbutton.x, y = evt->xbutton.y;
if (evt->xbutton.button == Button1)
nk_input_button(&rawfb->ctx, NK_BUTTON_LEFT, x, y, down);
if (evt->xbutton.button == Button2)
nk_input_button(&rawfb->ctx, NK_BUTTON_MIDDLE, x, y, down);
else if (evt->xbutton.button == Button3)
nk_input_button(&rawfb->ctx, NK_BUTTON_RIGHT, x, y, down);
else if (evt->xbutton.button == Button4)
nk_input_scroll(&rawfb->ctx, nk_vec2(0, 1.0f));
else if (evt->xbutton.button == Button5)
nk_input_scroll(&rawfb->ctx, nk_vec2(0, -1.0f));
else return 0;
return 1;
} else if (evt->type == MotionNotify) {
/* Mouse motion handler */
const int x = evt->xmotion.x, y = evt->xmotion.y;
nk_input_motion(&rawfb->ctx, x, y);
if (rawfb->ctx.input.mouse.grabbed) {
rawfb->ctx.input.mouse.pos.x = rawfb->ctx.input.mouse.prev.x;
rawfb->ctx.input.mouse.pos.y = rawfb->ctx.input.mouse.prev.y;
XWarpPointer(xlib.dpy, None, xlib.root, 0, 0, 0, 0, (int)rawfb->ctx.input.mouse.pos.x, (int)rawfb->ctx.input.mouse.pos.y);
} return 1;
} else if (evt->type == Expose || evt->type == ConfigureNotify) {
/* Window resize handler */
void *fb;
rawfb_pl pl;
unsigned int width, height;
XWindowAttributes attr;
XGetWindowAttributes(dpy, win, &attr);
width = (unsigned int)attr.width;
height = (unsigned int)attr.height;
nk_xlib_shutdown();
nk_xlib_init(dpy, XDefaultVisual(dpy, screen), screen, win, width, height, &fb, &pl);
nk_rawfb_resize_fb(rawfb, fb, width, height, width * 4, pl);
} else if (evt->type == KeymapNotify) {
XRefreshKeyboardMapping(&evt->xmapping);
return 1;
} else if (evt->type == LeaveNotify) {
XUndefineCursor(xlib.dpy, xlib.root);
} else if (evt->type == EnterNotify) {
XDefineCursor(xlib.dpy, xlib.root, xlib.cursor);
} return 0;
}
NK_API void
nk_xlib_shutdown(void)
{
XFreeCursor(xlib.dpy, xlib.cursor);
if (xlib.fallback) {
free(xlib.ximg->data);
XDestroyImage(xlib.ximg);
} else {
XShmDetach(xlib.dpy, &xlib.xsi);
XDestroyImage(xlib.ximg);
shmdt(xlib.xsi.shmaddr);
shmctl(xlib.xsi.shmid, IPC_RMID, NULL);
} memset(&xlib, 0, sizeof(xlib));
}
NK_API void
nk_xlib_render(Drawable screen)
{
if (xlib.fallback)
XPutImage(xlib.dpy, screen, xlib.gc, xlib.ximg,
0, 0, 0, 0, xlib.ximg->width, xlib.ximg->height);
else XShmPutImage(xlib.dpy, screen, xlib.gc, xlib.ximg,
0, 0, 0, 0, xlib.ximg->width, xlib.ximg->height, False);
}
#endif
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