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/* gcc -g -O2 -Wall `pkg-config --cflags --libs xcb` -o test xcb_image.o test_xcb_image.c */
#include <stdlib.h>
#include <stdio.h>
#include <xcb/xcb.h>
#include "xcb_aux.h"
#include "xcb_image.h"
#define W_W 64
#define W_H 64
void
reflect_window (xcb_connection_t *c,
xcb_drawable_t win,
xcb_drawable_t new_win,
xcb_gcontext_t gc,
uint16_t width,
uint16_t height)
{
xcb_image_t *image;
uint32_t pixel1;
uint32_t pixel2;
int32_t left_x;
int32_t right_x;
int32_t y;
int format;
format = XCB_IMAGE_FORMAT_Z_PIXMAP;
printf ("get_image %d %d\n", width, height);
image = xcb_image_get (c, win,
0, 0, width, height,
~0,
format);
printf ("Create image summary:\n");
printf (" * format................: %d\n", image->format);
printf (" * byte order............: %d\n", image->byte_order);
printf (" * bitmap order..........: %d\n", image->bit_order);
printf (" * bitmap pad............: %d\n", image->scanline_pad);
printf (" * depth.................: %d\n", image->depth);
printf (" * bytes/line............: %d\n", image->stride);
printf (" * bits/pixel (or unit)..: %d\n", image->bpp);
printf ("bpl %d %d\n", image->stride, image->height);
printf("calculating reflection -- this may take awhile...\n");
for (left_x = 0 ; left_x < width/2 ; left_x++)
{
for (y = 0 ; y < height ; y++)
{
pixel1 = xcb_image_get_pixel (image, left_x, y);
right_x = width - left_x-1;
if (left_x != right_x)
{
pixel2 = xcb_image_get_pixel (image, right_x, y);
xcb_image_put_pixel (image, left_x, y, pixel2);
}
xcb_image_put_pixel (image, right_x, y, pixel1);
}
}
printf("putting image\n");
xcb_image_put (c, new_win, gc, image, 0, 0, 0);
image = xcb_image_get (c, new_win,
0, 0, width, height,
~0,
format);
printf ("done\n");
}
int
main (int argc, char *argv[])
{
xcb_connection_t *c;
xcb_screen_t *screen;
xcb_drawable_t win;
xcb_drawable_t new_win;
xcb_drawable_t rect;
xcb_rectangle_t rect_coord = { 0, 0, W_W, W_H};
xcb_gcontext_t bgcolor, fgcolor;
xcb_point_t points[2];
uint32_t mask;
uint32_t valgc[2];
uint32_t valwin[3];
int depth;
int screen_nbr;
xcb_generic_event_t *e;
/* Open the connexion to the X server and get the first screen */
c = xcb_connect (NULL, &screen_nbr);
screen = xcb_aux_get_screen (c, screen_nbr);
depth = xcb_aux_get_depth (c, screen);
/* Create a black graphic context for drawing in the foreground */
win = screen->root;
fgcolor = xcb_generate_id(c);
mask = XCB_GC_FOREGROUND | XCB_GC_GRAPHICS_EXPOSURES;
valgc[0] = screen->black_pixel;
valgc[1] = 0; /* no graphics exposures */
xcb_create_gc(c, fgcolor, win, mask, valgc);
bgcolor = xcb_generate_id(c);
mask = XCB_GC_FOREGROUND | XCB_GC_GRAPHICS_EXPOSURES;
valgc[0] = screen->white_pixel;
valgc[1] = 0; /* no graphics exposures */
xcb_create_gc(c, bgcolor, win, mask, valgc);
/* Ask for our window's Id */
win = xcb_generate_id(c);
/* Create the window */
mask = XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK | XCB_CW_DONT_PROPAGATE;
valwin[0] = screen->white_pixel;
valwin[1] = XCB_EVENT_MASK_KEY_PRESS | XCB_EVENT_MASK_BUTTON_RELEASE | XCB_EVENT_MASK_EXPOSURE;
valwin[2] = XCB_EVENT_MASK_BUTTON_PRESS;
xcb_create_window (c, /* Connection */
0, /* depth */
win, /* window Id */
screen->root, /* parent window */
0, 0, /* x, y */
W_W, W_H, /* width, height */
10, /* border_width */
XCB_WINDOW_CLASS_INPUT_OUTPUT,/* class */
screen->root_visual, /* visual */
mask, valwin); /* masks, not used yet */
/* Map the window on the screen */
xcb_map_window (c, win);
/* Create a Pixmap that will fill the window */
rect = xcb_generate_id (c);
xcb_create_pixmap(c, depth, rect, win, W_W, W_H);
xcb_poly_fill_rectangle(c, rect, bgcolor, 1, &rect_coord);
points[0].x = 0;
points[0].y = 0;
points[1].x = W_W;
points[1].y = W_H;
xcb_poly_line(c, XCB_COORD_MODE_ORIGIN, rect, fgcolor, 2, points);
points[0].x = W_W / 4;
points[0].y = 0;
points[1].x = W_W / 2;
points[1].y = W_H / 2;
xcb_poly_line(c, XCB_COORD_MODE_ORIGIN, rect, fgcolor, 2, points);
/* Ask for our window's Id */
new_win = xcb_generate_id(c);
/* Create the window */
mask = XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK | XCB_CW_DONT_PROPAGATE;
valwin[0] = screen->white_pixel;
valwin[1] = XCB_EVENT_MASK_KEY_PRESS | XCB_EVENT_MASK_BUTTON_RELEASE | XCB_EVENT_MASK_EXPOSURE;
valwin[2] = XCB_EVENT_MASK_BUTTON_PRESS;
xcb_create_window (c, /* Connection */
0, /* depth */
new_win, /* window Id */
screen->root, /* parent window */
0, 0, /* x, y */
W_W, W_H, /* width, height */
10, /* border_width */
XCB_WINDOW_CLASS_INPUT_OUTPUT,/* class */
screen->root_visual, /* visual */
mask, valwin); /* masks, not used yet */
/* Map the window on the screen */
xcb_map_window (c, new_win);
xcb_flush (c);
while ((e = xcb_wait_for_event(c)))
{
switch (e->response_type)
{
case XCB_EXPOSE:
{
xcb_copy_area(c, rect, win, bgcolor,
0, 0, 0, 0, W_W, W_H);
reflect_window (c, win, new_win,
fgcolor,
W_W, W_H);
xcb_flush (c);
break;
}
}
free (e);
}
return 1;
}
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