XCB: Stop taking the xcb socket

This makes the xcb backend use the auto-generated xcb API instead of
hand-writing each request. This should also improve parallelism with non-cairo
threads that use the same xcb connection.

Big thanks to Andrea Canciani for taking a look at this and finding lots of good
improvements (especially finding xcb_send_request was great).

cairo-perf-trace and cairo-perf-diff-files between master
(6732dbf2992891be4b1f08b14a5c449fd08b637c) and this change:

 $ ./cairo-perf-diff-files ../master_perf ../xcb_no_socket_perf
old: master_perf
new: xcb_no_socket_perf
Speedups
========
  xcb-rgba                  evolution-0    23558.86 (23558.86 0.00%) -> 19338.78 (19338.78 0.00%):  1.22x speedup
▎
  xcb-rgba          poppler-bug-12266-0     98.43 (98.43 0.00%) ->  82.36 (82.36 0.00%):  1.20x speedup
▎
  xcb-rgba         gnome-terminal-vim-0    5518.08 (5518.08 0.00%) -> 4905.92 (4905.92 0.00%):  1.12x speedup
▏
  xcb-rgba    gnome-terminal-20090601-0    45648.46 (45648.46 0.00%) -> 41231.25 (41231.25 0.00%):  1.11x speedup
▏
  xcb-rgba         evolution-20090607-0    71643.69 (71643.69 0.00%) -> 66314.95 (66314.95 0.00%):  1.08x speedup
▏
  xcb-rgba                    poppler-0    3501.69 (3501.69 0.00%) -> 3322.26 (3322.26 0.00%):  1.05x speedup

Slowdowns
=========
  xcb-rgba       gnome-system-monitor-0    7500.01 (7500.01 0.00%) -> 7923.70 (7923.70 0.00%):  1.06x slowdown

  xcb-rgba        swfdec-youtube-full-0    26409.89 (26409.89 0.00%) -> 28430.76 (28430.76 0.00%):  1.08x slowdown
▏
  xcb-rgba gnome-system-monitor-20090821-0    34801.61 (34801.61 0.00%) -> 37891.14 (37891.14 0.00%):  1.09x slowdown

Signed-off-by: Uli Schlachter <psychon@znc.in>

1 files changed, 11 insertions, 94 deletions

diff --git a/src/cairo-xcb-connection-shm.c b/src/cairo-xcb-connection-shm.c
index 060a03e3..3e76301d 100644
--- a/src/cairo-xcb-connection-shm.c
+++ b/src/cairo-xcb-connection-shm.c
@@ -41,35 +41,12 @@ _cairo_xcb_connection_shm_attach (cairo_xcb_connection_t *connection,
 				  uint32_t id,
 				  cairo_bool_t readonly)
 {
-    struct {
-	uint8_t req;
-	uint8_t shm_req;
-	uint16_t length;
-	uint32_t segment;
-	uint32_t id;
-	uint8_t readonly;
-	uint8_t pad1;
-	uint16_t pad2;
-    } req;
-    struct iovec vec[1];
-
-    COMPILE_TIME_ASSERT (sizeof (req) == 16);
-
-    req.req = connection->shm->major_opcode;
-    req.shm_req = 1;
-    req.length = sizeof (req) >> 2;
-    req.segment = _cairo_xcb_connection_get_xid (connection);
-    req.id = id;
-    req.readonly = readonly;
-
-    vec[0].iov_base = &req;
-    vec[0].iov_len = sizeof (req);
-
-    _cairo_xcb_connection_write (connection, vec, 1);
-    return req.segment;
+    uint32_t segment = _cairo_xcb_connection_get_xid (connection);
+    xcb_shm_attach (connection->xcb_connection, segment, id, readonly);
+    return segment;
 }
 
-uint64_t
+unsigned int
 _cairo_xcb_connection_shm_put_image (cairo_xcb_connection_t *connection,
 				     xcb_drawable_t dst,
 				     xcb_gcontext_t gc,
@@ -85,53 +62,11 @@ _cairo_xcb_connection_shm_put_image (cairo_xcb_connection_t *connection,
 				     uint32_t shm,
 				     uint32_t offset)
 {
-    struct {
-	uint8_t req;
-	uint8_t shm_req;
-	uint16_t len;
-	uint32_t dst;
-	uint32_t gc;
-	uint16_t total_width;
-	uint16_t total_height;
-	int16_t src_x;
-	int16_t src_y;
-	uint16_t src_width;
-	uint16_t src_height;
-	int16_t dst_x;
-	int16_t dst_y;
-	uint8_t depth;
-	uint8_t format;
-	uint8_t send_event;
-	uint8_t pad;
-	uint32_t shm;
-	uint32_t offset;
-    } req;
-    struct iovec vec[2];
-
-    req.req = connection->shm->major_opcode;
-    req.shm_req = 3;
-    req.len = sizeof (req) >> 2;
-    req.dst = dst;
-    req.gc = gc;
-    req.total_width = total_width;
-    req.total_height = total_height;
-    req.src_x = src_x;
-    req.src_y = src_y;
-    req.src_width = width;
-    req.src_height = height;
-    req.dst_x = dst_x;
-    req.dst_y = dst_y;
-    req.depth = depth;
-    req.format = XCB_IMAGE_FORMAT_Z_PIXMAP;
-    req.send_event = 0;
-    req.shm = shm;
-    req.offset = offset;
-
-    vec[0].iov_base = &req;
-    vec[0].iov_len = sizeof (req);
-
-    _cairo_xcb_connection_write (connection, vec, 1);
-    return connection->seqno;
+    xcb_void_cookie_t cookie;
+    cookie = xcb_shm_put_image (connection->xcb_connection, dst, gc, total_width, total_height,
+				src_x, src_y, width, height, dst_x, dst_y, depth,
+				XCB_IMAGE_FORMAT_Z_PIXMAP, 0, shm, offset);
+    return cookie.sequence;
 }
 
 cairo_status_t
@@ -164,31 +99,13 @@ _cairo_xcb_connection_shm_get_image (cairo_xcb_connection_t *connection,
 	return _cairo_error (CAIRO_STATUS_READ_ERROR);
     }
 
-    return _cairo_xcb_connection_take_socket (connection);
+    return CAIRO_STATUS_SUCCESS;
 }
 
 void
 _cairo_xcb_connection_shm_detach (cairo_xcb_connection_t *connection,
 				  uint32_t segment)
 {
-    struct {
-	uint8_t req;
-	uint8_t shm_req;
-	uint16_t length;
-	uint32_t segment;
-    } req;
-    struct iovec vec[1];
-
-    COMPILE_TIME_ASSERT (sizeof (req) == 8);
-
-    req.req = connection->shm->major_opcode;
-    req.shm_req = 2;
-    req.length = sizeof (req) >> 2;
-    req.segment = segment;
-
-    vec[0].iov_base = &req;
-    vec[0].iov_len = sizeof (req);
-
-    _cairo_xcb_connection_write (connection, vec, 1);
+    xcb_shm_detach (connection->xcb_connection, segment);
     _cairo_xcb_connection_put_xid (connection, segment);
 }