wes
/
Xblit
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity
Browse Source

Move to XCB

master
Wesley Kerfoot 6 years ago
parent
d1aeb6e411
commit
b77ae46cc7
2 changed files with 176 additions and 311 deletions
Whitespace
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Split View
Diff Options
Show Stats Download Patch File Download Diff File
  1. 262
      blit.c
  2. 225
      blit2.c

262
blit.c
View File

@ -1,16 +1,62 @@
#include <X11/Xcms.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
Display*
#include <unistd.h>
#include <xcb/xcb.h>
/* Macro definition to parse X server events
* The ~0x80 is needed to get the lower 7 bits
* XCB supports exactly the events specified in the protocol (33 events).
* This structure contains the type of event received (including a bit for whether it came from the server or another client),
* as well as the data associated with the event
* (e.g. position on the screen where the event was generated,
* mouse button associated with the event,
* region of the screen associated with a "redraw" event, etc).
* The way to read the event's data depends on the event type.
*/
#define RECEIVE_EVENT(ev) (ev->response_type & ~0x80)
/*
* Here is the definition of xcb_cw_t
typedef enum {
XCB_CW_BACK_PIXMAP = 1L<<0,
XCB_CW_BACK_PIXEL = 1L<<1,
XCB_CW_BORDER_PIXMAP = 1L<<2,
XCB_CW_BORDER_PIXEL = 1L<<3,
XCB_CW_BIT_GRAVITY = 1L<<4,
XCB_CW_WIN_GRAVITY = 1L<<5,
XCB_CW_BACKING_STORE = 1L<<6,
XCB_CW_BACKING_PLANES = 1L<<7,
XCB_CW_BACKING_PIXEL = 1L<<8,
XCB_CW_OVERRIDE_REDIRECT = 1L<<9,
XCB_CW_SAVE_UNDER = 1L<<10,
XCB_CW_EVENT_MASK = 1L<<11,
XCB_CW_DONT_PROPAGATE = 1L<<12,
XCB_CW_COLORMAP = 1L<<13,
XCB_CW_CURSOR = 1L<<14
} xcb_cw_t;
* Why does this matter?
* This lets us define what events we want to handle
* See here https://xcb.freedesktop.org/tutorial/events/
*/
/* TODO
*
* Figure out what resources need to be free'd and figure out a strategy for allocating things better
* Figure out a better way of managing the event loop than nanosleep?
* Figure out which events we need to actually be handling
* Figure out how to resize dynamically (See handmade hero videos for tips)
* Figure out good strategy for only copying changed pixels to window
* Figure out what allocations can fail and what to do if they fail
*/
xcb_connection_t*
getDisplay() {
/* Get a display to use */
/* Currently just uses the default display */
Display *display = XOpenDisplay(NULL);
xcb_connection_t *display = xcb_connect (NULL, NULL);
if (display == NULL) {
fprintf(stderr, "Could not open the display! :(\n");
@ -20,116 +66,160 @@ getDisplay() {
return display;
}
XColor*
getColor(Display *display,
int screen,
xcb_screen_t*
getScreen(xcb_connection_t *display) {
const xcb_setup_t *setup = xcb_get_setup(display);
xcb_screen_iterator_t iter = xcb_setup_roots_iterator(setup);
xcb_screen_t *screen = iter.data;
return screen;
}
xcb_window_t
getWindow(xcb_connection_t *display,
xcb_screen_t *screen) {
/* Create the window */
xcb_window_t window = xcb_generate_id(display);
xcb_cw_t mask = XCB_CW_EVENT_MASK;
/* Define all the events we want to handle with xcb */
/* XCB_EVENT_MASK_EXPOSURE is the "exposure" event */
/* I.e. it fires when our window shows up on the screen */
uint32_t valwin[1] = { XCB_EVENT_MASK_EXPOSURE };
xcb_create_window(display, /* Connection */
XCB_COPY_FROM_PARENT, /* depth (same as root) */
window, /* window Id */
screen->root, /* parent window */
0, /* x */
0, /* y */
150,
150,/* width, height */
10, /* border_width */
XCB_WINDOW_CLASS_INPUT_OUTPUT, /* class */
screen->root_visual, /* visual */
mask, /* value mask, used for events */
valwin); /* masks, used for events */
return window;
}
xcb_alloc_color_reply_t*
getColor(xcb_connection_t *display,
xcb_screen_t *screen,
xcb_window_t window,
unsigned short red,
unsigned short green,
unsigned short blue) {
/* Return a new XColor structure */
/* Return a new xcb color structure */
/* Initialize it with RGB */
XColor *xcolor = malloc(sizeof (XColor));
xcb_colormap_t colormapId = xcb_generate_id(display);
xcolor->red = red;
xcolor->green = green;
xcolor->blue = blue;
xcb_create_colormap(display,
XCB_COLORMAP_ALLOC_NONE,
colormapId,
window,
screen->root_visual);
xcolor->flags = DoRed | DoGreen | DoBlue;
XAllocColor(display,
XDefaultColormap(display, screen),
xcolor);
return xcolor;
}
xcb_alloc_color_reply_t *reply = xcb_alloc_color_reply(display,
xcb_alloc_color(display,
colormapId,
red,
green,
blue),
NULL);
int
main(void) {
Window window;
XEvent event;
return reply;
}
Display *display = getDisplay();
int screen = DefaultScreen(display);
GC gc = XDefaultGC(display, screen);
static struct timespec
genSleep(time_t sec,
long nanosec) {
struct timespec t;
t.tv_sec = sec;
t.tv_nsec = nanosec;
return t;
}
XColor *xcolor = getColor(display, screen, 0xffff, 0xffff, 0xffff);
static xcb_gcontext_t
getGC(xcb_connection_t *display,
xcb_screen_t *screen) {
window = XCreateSimpleWindow(display,
RootWindow(display, screen),
10,
10,
100,
100,
1,
WhitePixel(display, screen),
xcolor->pixel);
xcb_drawable_t window = screen->root;
XSelectInput(display,
window,
ExposureMask | KeyPressMask);
xcb_gcontext_t foreground = xcb_generate_id(display);
XMapWindow(display, window);
uint32_t mask = XCB_GC_FOREGROUND | XCB_GC_GRAPHICS_EXPOSURES;
uint32_t values[2] = {screen->black_pixel, 0};
int depth = DefaultDepth(display, DefaultScreen(display));
xcb_create_gc(display,
foreground,
window,
mask,
values);
Pixmap pixmap;
pixmap = XCreatePixmap(display,
window,
100,
100,
depth);
return foreground;
}
int factor = 0;
int
main(void) {
struct timespec req;
struct timespec rem;
xcb_connection_t *display = getDisplay();
req.tv_sec = 0;
req.tv_nsec = 20000000;
xcb_screen_t *screen = getScreen(display);
while (1) {
/* Event loop that handles events from the X server's event queue */
/* Will actually block if there are no events */
xcb_window_t window = getWindow(display, screen);
XNextEvent(display, &event);
if (event.type == Expose) {
xcb_map_window(display, window);
XColor *boxcolor = getColor(display, screen, 32000, 0, 32000);
xcb_alloc_color_reply_t *xcolor = getColor(display,
screen,
window,
0xffff,
0xffff,
0xffff);
XSetForeground(display, gc, boxcolor->pixel);
xcb_flush(display);
}
/* Used to handle the event loop */
struct timespec req = genSleep(0, 20000000);
struct timespec rem = genSleep(0, 0);
//if (event.type == KeyPress) {
//break;
//}
xcb_generic_event_t *event;
xcb_expose_event_t *expose;
for(int x = 0; x < 100; x++) {
for(int y = 0; y < 100; y++) {
XDrawPoint(display, pixmap, gc, x, y);
while (1) {
event = xcb_poll_for_event(display);
if (event != NULL) {
switch RECEIVE_EVENT(event) {
/* TODO encapsulate event handlers in functions */
case XCB_EXPOSE: {
expose = (xcb_expose_event_t *)event;
printf("Window %u exposed. Region to be redrawn at location (%u,%u), with dimension (%u,%u)\n",
expose->window, expose->x,
expose->y,
expose->width,
expose->height);
break;
}
default: {
printf ("Unknown event: %u\n", event->response_type);
break;
}
free(event);
}
}
factor++;
XClearWindow(display, window);
XCopyArea(display,
pixmap,
window,
gc,
0,
0,
100,
100,
factor,
factor);
nanosleep(&req, &rem);
}
XCloseDisplay(display);
xcb_disconnect(display);
return 0;
}

225
blit2.c
View File

@ -1,225 +0,0 @@
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#include <xcb/xcb.h>
/* Macro definition to parse X server events
* The ~0x80 is needed to get the lower 7 bits
* XCB supports exactly the events specified in the protocol (33 events).
* This structure contains the type of event received (including a bit for whether it came from the server or another client),
* as well as the data associated with the event
* (e.g. position on the screen where the event was generated,
* mouse button associated with the event,
* region of the screen associated with a "redraw" event, etc).
* The way to read the event's data depends on the event type.
*/
#define RECEIVE_EVENT(ev) (ev->response_type & ~0x80)
/*
* Here is the definition of xcb_cw_t
typedef enum {
XCB_CW_BACK_PIXMAP = 1L<<0,
XCB_CW_BACK_PIXEL = 1L<<1,
XCB_CW_BORDER_PIXMAP = 1L<<2,
XCB_CW_BORDER_PIXEL = 1L<<3,
XCB_CW_BIT_GRAVITY = 1L<<4,
XCB_CW_WIN_GRAVITY = 1L<<5,
XCB_CW_BACKING_STORE = 1L<<6,
XCB_CW_BACKING_PLANES = 1L<<7,
XCB_CW_BACKING_PIXEL = 1L<<8,
XCB_CW_OVERRIDE_REDIRECT = 1L<<9,
XCB_CW_SAVE_UNDER = 1L<<10,
XCB_CW_EVENT_MASK = 1L<<11,
XCB_CW_DONT_PROPAGATE = 1L<<12,
XCB_CW_COLORMAP = 1L<<13,
XCB_CW_CURSOR = 1L<<14
} xcb_cw_t;
* Why does this matter?
* This lets us define what events we want to handle
* See here https://xcb.freedesktop.org/tutorial/events/
*/
/* TODO
*
* Figure out what resources need to be free'd and figure out a strategy for allocating things better
* Figure out a better way of managing the event loop than nanosleep?
* Figure out which events we need to actually be handling
* Figure out how to resize dynamically (See handmade hero videos for tips)
* Figure out good strategy for only copying changed pixels to window
* Figure out what allocations can fail and what to do if they fail
*/
xcb_connection_t*
getDisplay() {
/* Get a display to use */
/* Currently just uses the default display */
xcb_connection_t *display = xcb_connect (NULL, NULL);
if (display == NULL) {
fprintf(stderr, "Could not open the display! :(\n");
exit(1);
}
return display;
}
xcb_screen_t*
getScreen(xcb_connection_t *display) {
const xcb_setup_t *setup = xcb_get_setup(display);
xcb_screen_iterator_t iter = xcb_setup_roots_iterator(setup);
xcb_screen_t *screen = iter.data;
return screen;
}
xcb_window_t
getWindow(xcb_connection_t *display,
xcb_screen_t *screen) {
/* Create the window */
xcb_window_t window = xcb_generate_id(display);
xcb_cw_t mask = XCB_CW_EVENT_MASK;
/* Define all the events we want to handle with xcb */
/* XCB_EVENT_MASK_EXPOSURE is the "exposure" event */
/* I.e. it fires when our window shows up on the screen */
uint32_t valwin[1] = { XCB_EVENT_MASK_EXPOSURE };
xcb_create_window(display, /* Connection */
XCB_COPY_FROM_PARENT, /* depth (same as root) */
window, /* window Id */
screen->root, /* parent window */
0, /* x */
0, /* y */
150,
150,/* width, height */
10, /* border_width */
XCB_WINDOW_CLASS_INPUT_OUTPUT, /* class */
screen->root_visual, /* visual */
mask, /* value mask, used for events */
valwin); /* masks, used for events */
return window;
}
xcb_alloc_color_reply_t*
getColor(xcb_connection_t *display,
xcb_screen_t *screen,
xcb_window_t window,
unsigned short red,
unsigned short green,
unsigned short blue) {
/* Return a new xcb color structure */
/* Initialize it with RGB */
xcb_colormap_t colormapId = xcb_generate_id(display);
xcb_create_colormap(display,
XCB_COLORMAP_ALLOC_NONE,
colormapId,
window,
screen->root_visual);
xcb_alloc_color_reply_t *reply = xcb_alloc_color_reply(display,
xcb_alloc_color(display,
colormapId,
red,
green,
blue),
NULL);
return reply;
}
static struct timespec
genSleep(time_t sec,
long nanosec) {
struct timespec t;
t.tv_sec = sec;
t.tv_nsec = nanosec;
return t;
}
static xcb_gcontext_t
getGC(xcb_connection_t *display,
xcb_screen_t *screen) {
xcb_drawable_t window = screen->root;
xcb_gcontext_t foreground = xcb_generate_id(display);
uint32_t mask = XCB_GC_FOREGROUND | XCB_GC_GRAPHICS_EXPOSURES;
uint32_t values[2] = {screen->black_pixel, 0};
xcb_create_gc(display,
foreground,
window,
mask,
values);
return foreground;
}
int
main(void) {
xcb_connection_t *display = getDisplay();
xcb_screen_t *screen = getScreen(display);
xcb_window_t window = getWindow(display, screen);
xcb_map_window(display, window);
xcb_alloc_color_reply_t *xcolor = getColor(display,
screen,
window,
0xffff,
0xffff,
0xffff);
xcb_flush(display);
/* Used to handle the event loop */
struct timespec req = genSleep(0, 20000000);
struct timespec rem = genSleep(0, 0);
xcb_generic_event_t *event;
xcb_expose_event_t *expose;
while (1) {
event = xcb_poll_for_event(display);
if (event != NULL) {
switch RECEIVE_EVENT(event) {
/* TODO encapsulate event handlers in functions */
case XCB_EXPOSE: {
expose = (xcb_expose_event_t *)event;
printf("Window %u exposed. Region to be redrawn at location (%u,%u), with dimension (%u,%u)\n",
expose->window, expose->x,
expose->y,
expose->width,
expose->height);
break;
}
default: {
printf ("Unknown event: %u\n", event->response_type);
break;
}
free(event);
}
}
nanosleep(&req, &rem);
}
xcb_disconnect(display);
return 0;
}
Write Preview
Loading…
Cancel
Save