Use struct buffer from cairo-util.c in flower.c.

Makefile

@@ -43,7 +43,7 @@ glx-compositor.so : $(glx_compositor_objs)
 libwayland.so $(compositors) :
 	gcc -o $@ $^ $(LDLIBS) -shared 
 
-flower_objs = flower.o wayland-glib.o
+flower_objs = flower.o wayland-glib.o cairo-util.o
 pointer_objs = pointer.o wayland-glib.o cairo-util.o
 background_objs = background.o wayland-glib.o
 window_objs = window.o gears.o wayland-glib.o cairo-util.o

flower.c

@@ -14,61 +14,11 @@
 
 #include "wayland-client.h"
 #include "wayland-glib.h"
+#include "cairo-util.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;
-	void *data;
-
-	width = cairo_image_surface_get_width(surface);
-	height = cairo_image_surface_get_height(surface);
-	stride = cairo_image_surface_get_stride(surface);
-	data = cairo_image_surface_get_data(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) data;
-	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
 set_random_color(cairo_t *cr)
 {
@@ -155,12 +105,12 @@ int main(int argc, char *argv[])
 {
 	struct wl_display *display;
 	int fd;
-	uint32_t name;
 	cairo_surface_t *s;
 	struct timespec ts;
 	GMainLoop *loop;
 	GSource *source;
 	struct flower flower;
+	struct buffer *buffer;
 
 	fd = open(gem_device, O_RDWR);
 	if (fd < 0) {
@@ -190,10 +140,10 @@ int main(int argc, char *argv[])
 	flower.i = ts.tv_nsec;
 
 	s = draw_stuff(flower.width, flower.height);
-	name = name_cairo_surface(fd, s);
+	buffer = buffer_create_from_cairo_surface(fd, s);
 
-	wl_surface_attach(flower.surface, name, flower.width, flower.height,
+	wl_surface_attach(flower.surface, buffer->name, flower.width, flower.height,
-			  cairo_image_surface_get_stride(s));
+			  buffer->stride);
 
 	g_timeout_add(20, move_flower, &flower);