Add a new client that draws a pointer.

pointer.c

@@ -0,0 +1,162 @@
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <i915_drm.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <math.h>
+#include <time.h>
+#include <cairo.h>
+
+#include "wayland-client.h"
+
+static const char gem_device[] = "/dev/dri/card0";
+static const char socket_name[] = "\0wayland";
+
+static uint32_t name_cairo_surface(int fd, cairo_surface_t *surface)
+{
+	struct drm_i915_gem_create create;
+	struct drm_gem_flink flink;
+	struct drm_i915_gem_pwrite pwrite;
+	int32_t width, height, stride;
+
+	width = cairo_image_surface_get_width(surface);
+	height = cairo_image_surface_get_height(surface);
+	stride = cairo_image_surface_get_stride(surface);
+
+	memset(&create, 0, sizeof(create));
+	create.size = height * stride;
+
+	if (ioctl(fd, DRM_IOCTL_I915_GEM_CREATE, &create) != 0) {
+		fprintf(stderr, "gem create failed: %m\n");
+		return 0;
+	}
+
+	pwrite.handle = create.handle;
+	pwrite.offset = 0;
+	pwrite.size = height * stride;
+	pwrite.data_ptr = (uint64_t) (uintptr_t)
+		cairo_image_surface_get_data(surface);
+	if (ioctl(fd, DRM_IOCTL_I915_GEM_PWRITE, &pwrite) < 0) {
+		fprintf(stderr, "gem pwrite failed: %m\n");
+		return 0;
+	}
+
+	flink.handle = create.handle;
+	if (ioctl(fd, DRM_IOCTL_GEM_FLINK, &flink) != 0) {
+		fprintf(stderr, "gem flink failed: %m\n");
+		return 0;
+	}
+
+#if 0
+	/* We need to hold on to the handle until the server has received
+	 * the attach request... we probably need a confirmation event.
+	 * I guess the breadcrumb idea will suffice. */
+	struct drm_gem_close close;
+	close.handle = create.handle;
+	if (ioctl(fd, DRM_IOCTL_GEM_CLOSE, &close) < 0) {
+		fprintf(stderr, "gem close failed: %m\n");
+		return 0;
+	}
+#endif
+
+	return flink.name;
+}
+
+static void *
+draw_pointer(int width, int height)
+{
+	const int d = 2, end = 4, tx = 2, ty = 6, dx = 5, dy = 4;
+	cairo_surface_t *surface;
+	cairo_t *cr;
+
+	surface = cairo_image_surface_create(CAIRO_FORMAT_RGB24,
+					     width, height);
+
+	cr = cairo_create(surface);
+	cairo_set_line_width (cr, d);
+	cairo_move_to(cr, d, d);
+	cairo_line_to(cr, d + tx, d + ty);
+	cairo_line_to(cr, d + dx, d + dy);
+	cairo_line_to(cr, width - end, height - d);
+	cairo_line_to(cr, width - d, height - end);
+	cairo_line_to(cr, d + dy, d + dx);
+	cairo_line_to(cr, d + ty, d + tx);
+	cairo_close_path(cr);
+	cairo_set_source_rgb(cr, 1, 1, 1);
+	cairo_stroke_preserve(cr);
+	cairo_set_source_rgb(cr, 1, 0, 0);
+	cairo_fill(cr);
+
+	cairo_destroy(cr);
+
+	return surface;
+}
+
+static int
+connection_update(struct wl_connection *connection,
+		  uint32_t mask, void *data)
+{
+	return 0;
+}
+
+struct pointer {
+	int width, height;
+	struct wl_surface *surface;
+};
+
+void event_handler(struct wl_display *display,
+		   uint32_t opcode,
+		   uint32_t arg1, uint32_t arg2, void *data)
+{
+	struct pointer *pointer = data;
+
+	wl_surface_map(pointer->surface, arg1, arg2, pointer->width, pointer->height);
+	
+}
+
+int main(int argc, char *argv[])
+{
+	struct wl_display *display;
+	struct pointer pointer;
+	int fd;
+	uint32_t name;
+	cairo_surface_t *s;
+
+	srandom(time(NULL));
+
+	fd = open(gem_device, O_RDWR);
+	if (fd < 0) {
+		fprintf(stderr, "drm open failed: %m\n");
+		return -1;
+	}
+
+	display = wl_display_create(socket_name,
+				    connection_update, NULL);
+	if (display == NULL) {
+		fprintf(stderr, "failed to create display: %m\n");
+		return -1;
+	}
+
+	pointer.width = 16;
+	pointer.height = 16;
+	pointer.surface = wl_display_create_surface(display);
+
+	s = draw_pointer(pointer.width, pointer.height);
+	name = name_cairo_surface(fd, s);
+
+	wl_surface_attach(pointer.surface, name,
+			  pointer.width, pointer.height,
+			  cairo_image_surface_get_stride(s));
+
+	wl_display_set_event_handler(display, event_handler, &pointer);
+
+	while (1)
+		wl_display_iterate(display,
+				   WL_CONNECTION_WRITABLE |
+				   WL_CONNECTION_READABLE);
+
+	return 0;
+}