[cairo-commit] [cairo-www] src/cookbook src/cookbook.mdwn src/examples.mdwn

[Bryce Harrington]

 src/cookbook.mdwn         |    1 
 src/cookbook/xcbsurface.c |   93 ++++++++++++++++++++++++++++++++++++++++++++++
 src/examples.mdwn         |    4 -
 3 files changed, 94 insertions(+), 4 deletions(-)

New commits:
commit 521a996236b92d3dc37b54951e8210466bcc5a7b
Author: Bryce Harrington <bryce at osg.samsung.com>
Date:   Mon Jun 29 12:46:33 2015 -0700

    cookbook: Add Uli's XcbSurface example in place of linkrot
    
    We used to link to an externally hosted cairo-xcb-demo git repo but this
    appears to have gone extinct, so replace that with a locally hosted
    example Uli posted to the cairo devel list, June 26, 2015.

diff --git a/src/cookbook.mdwn b/src/cookbook.mdwn
index 66bb541..1205376 100644
--- a/src/cookbook.mdwn
+++ b/src/cookbook.mdwn
@@ -22,3 +22,4 @@
 * [[How_to:Perform a Gaussian blur on an image surface|blur.c]]
 * [[How_to:Apply an emboss filter to an image surface|emboss]]
 * [[How_to:Render text with Pango using Python|pycairo_pango]]
+* [[How_to:Create and use an XcbSurface|xcbsurface.c]]
diff --git a/src/cookbook/xcbsurface.c b/src/cookbook/xcbsurface.c
new file mode 100644
index 0000000..8d21dd7
--- /dev/null
+++ b/src/cookbook/xcbsurface.c
@@ -0,0 +1,93 @@
+#include <xcb/xcb.h>
+#include <cairo-xcb.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+static xcb_visualtype_t *find_visual(xcb_connection_t *c, xcb_visualid_t visual)
+{
+	xcb_screen_iterator_t screen_iter = xcb_setup_roots_iterator(xcb_get_setup(c));
+	
+	for (; screen_iter.rem; xcb_screen_next(&screen_iter)) {
+		xcb_depth_iterator_t depth_iter = xcb_screen_allowed_depths_iterator(screen_iter.data);
+		for (; depth_iter.rem; xcb_depth_next(&depth_iter)) {
+			xcb_visualtype_iterator_t visual_iter = xcb_depth_visuals_iterator(depth_iter.data);
+			for (; visual_iter.rem; xcb_visualtype_next(&visual_iter))
+				if (visual == visual_iter.data->visual_id)
+					return visual_iter.data;
+		}
+	}
+
+	return NULL;
+}
+
+int main()
+{
+	xcb_connection_t *c;
+	xcb_screen_t *screen;
+	xcb_window_t window;
+	uint32_t mask[2];
+	xcb_visualtype_t *visual;
+	xcb_generic_event_t *event;
+	cairo_surface_t *surface;
+	cairo_t *cr;
+
+	c = xcb_connect(NULL, NULL);
+	if (xcb_connection_has_error(c)) {
+		fprintf(stderr, "Could not connect to X11 server");
+		return 1;
+	}
+
+	mask[0] = 1;
+	mask[1] = XCB_EVENT_MASK_EXPOSURE;
+	screen = xcb_setup_roots_iterator(xcb_get_setup(c)).data;
+	window = xcb_generate_id(c);
+	xcb_create_window(c, XCB_COPY_FROM_PARENT, window, screen->root,
+			20, 20, 150, 150, 0,
+			XCB_WINDOW_CLASS_INPUT_OUTPUT,
+			screen->root_visual,
+			XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK,
+			mask);
+	xcb_map_window(c, window);
+
+	visual = find_visual(c, screen->root_visual);
+	if (visual == NULL) {
+		fprintf(stderr, "Some weird internal error...?!");
+		xcb_disconnect(c);
+		return 1;
+	}
+	surface = cairo_xcb_surface_create(c, window, visual, 150, 150);
+	cr = cairo_create(surface);
+
+	xcb_flush(c);
+	while ((event = xcb_wait_for_event(c))) {
+		switch (event->response_type & ~0x80) {
+		case XCB_EXPOSE:
+			/* Should check if this is the last expose event in the
+			 * sequence, but I'm too lazy right now...
+			 */
+			cairo_set_source_rgb(cr, 0, 1, 0);
+			cairo_paint(cr);
+
+			cairo_set_source_rgb(cr, 1, 0, 0);
+			cairo_move_to(cr, 0, 0);
+			cairo_line_to(cr, 150, 0);
+			cairo_line_to(cr, 150, 150);
+			cairo_close_path(cr);
+			cairo_fill(cr);
+
+			cairo_set_source_rgb(cr, 0, 0, 1);
+			cairo_set_line_width(cr, 20);
+			cairo_move_to(cr, 0, 150);
+			cairo_line_to(cr, 150, 0);
+			cairo_stroke(cr);
+
+			cairo_surface_flush(surface);
+			break;
+		}
+		free(event);
+		xcb_flush(c);
+	}
+	cairo_surface_finish(surface);
+	xcb_disconnect(c);
+	return 0;
+}
diff --git a/src/examples.mdwn b/src/examples.mdwn
index 8987b55..8b94db0 100644
--- a/src/examples.mdwn
+++ b/src/examples.mdwn
@@ -59,10 +59,6 @@ A pycairo example showing how to use librsvg on windows: [[cairo_rsvg_and_python
 A small physics / blob simulator using Cairo and SDL for
 rendering: [blobsallad](http://www.blobsallad.se/)
 
-A quick demo showing how to use Cairo and XCB together.
-
-    git clone git://git.thisnukes4u.net/cairo-xcb-demo.git
-
 The [[Xlib]] page outlines using Cairo with just Xlib to make a simple
 GUI demo.