[spice] Use display_channel_surface_has_canvas() instead of free coding it

[Francois Gouget <fgouget@xxxxxxxxxxxxxxx>]

Signed-off-by: Francois Gouget <fgouget@xxxxxxxxxxxxxxx>
---
 server/dcc.c             |  2 +-
 server/display-channel.c | 16 ++++++++--------
 2 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/server/dcc.c b/server/dcc.c
index ae7b4380f..a05b6e59e 100644
--- a/server/dcc.c
+++ b/server/dcc.c
@@ -579,7 +579,7 @@ void dcc_start(DisplayChannelClient *dcc)
         return;
 
     red_channel_client_ack_zero_messages_window(rcc);
-    if (display->priv->surfaces[0].context.canvas) {
+    if (display_channel_surface_has_canvas(display, 0)) {
         display_channel_current_flush(display, 0);
         red_channel_client_pipe_add_type(rcc, RED_PIPE_ITEM_TYPE_INVAL_PALETTE_CACHE);
         dcc_create_surface(dcc, 0);
diff --git a/server/display-channel.c b/server/display-channel.c
index e179abfd3..cf12e99bf 100644
--- a/server/display-channel.c
+++ b/server/display-channel.c
@@ -108,7 +108,7 @@ display_channel_finalize(GObject *object)
         spice_assert(ring_is_empty(&self->priv->streams));
 
         for (count = 0; count < NUM_SURFACES; ++count) {
-            spice_assert(self->priv->surfaces[count].context.canvas == NULL);
+            spice_assert(!display_channel_surface_has_canvas(self, count));
         }
     }
 
@@ -1498,7 +1498,7 @@ void display_channel_flush_all_surfaces(DisplayChannel *display)
     int x;
 
     for (x = 0; x < NUM_SURFACES; ++x) {
-        if (display->priv->surfaces[x].context.canvas) {
+        if (display_channel_surface_has_canvas(display, x)) {
             display_channel_current_flush(display, x);
         }
     }
@@ -2072,7 +2072,7 @@ void display_channel_destroy_surface_wait(DisplayChannel *display, uint32_t surf
 {
     if (!display_channel_validate_surface(display, surface_id))
         return;
-    if (!display->priv->surfaces[surface_id].context.canvas)
+    if (!display_channel_surface_has_canvas(display, surface_id))
         return;
 
     draw_depend_on_me(display, surface_id);
@@ -2092,12 +2092,12 @@ void display_channel_destroy_surfaces(DisplayChannel *display)
     spice_debug("trace");
     //to handle better
     for (i = 0; i < NUM_SURFACES; ++i) {
-        if (display->priv->surfaces[i].context.canvas) {
+        if (display_channel_surface_has_canvas(display, i)) {
             display_channel_destroy_surface_wait(display, i);
-            if (display->priv->surfaces[i].context.canvas) {
+            if (display_channel_surface_has_canvas(display, i)) {
                 display_channel_surface_unref(display, i);
             }
-            spice_assert(!display->priv->surfaces[i].context.canvas);
+            spice_assert(!display_channel_surface_has_canvas(display, i));
         }
     }
     spice_warn_if_fail(ring_is_empty(&display->priv->streams));
@@ -2424,7 +2424,7 @@ gboolean display_channel_validate_surface(DisplayChannel *display, uint32_t surf
         spice_warning("invalid surface_id %u", surface_id);
         return FALSE;
     }
-    if (!display->priv->surfaces[surface_id].context.canvas) {
+    if (!display_channel_surface_has_canvas(display, surface_id)) {
         spice_warning("canvas address is %p for %d (and is NULL)",
                    &(display->priv->surfaces[surface_id].context.canvas), surface_id);
         spice_warning("failed on %d", surface_id);
@@ -2462,7 +2462,7 @@ void display_channel_set_monitors_config_to_primary(DisplayChannel *display)
     QXLHead head = { 0, };
     uint16_t old_max = 1;
 
-    spice_return_if_fail(display->priv->surfaces[0].context.canvas);
+    spice_return_if_fail(display_channel_surface_has_canvas(display, 0));
 
     if (display->priv->monitors_config) {
         old_max = display->priv->monitors_config->max_allowed;
-- 
2.20.1

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