[spice-server v4 06/11] qxl: Add red_message_{new, ref, unref} helpers

[Christophe Fergeau <cfergeau@xxxxxxxxxx>]

Currently, RedMessage are allocated on the stack, and then
initialized/uninitialized with red_{get,put}_message
This makes the API inconsistent with what is being done for RedDrawable
and RedCursor. Since QXLMessage is just a (mostly unused/unsecure) debugging tool,
we can dynamically allocate it instead, and get a consistent API.
---
 server/red-parse-qxl.c | 37 ++++++++++++++++++++++++++++++++++---
 server/red-parse-qxl.h |  7 ++++---
 server/red-worker.c    |  8 ++++----
 3 files changed, 42 insertions(+), 10 deletions(-)

diff --git a/server/red-parse-qxl.c b/server/red-parse-qxl.c
index 4be53d3e5..e88e75096 100644
--- a/server/red-parse-qxl.c
+++ b/server/red-parse-qxl.c
@@ -1261,8 +1261,8 @@ void red_put_update_cmd(RedUpdateCmd *red)
     /* nothing yet */
 }
 
-bool red_get_message(QXLInstance *qxl_instance, RedMemSlotInfo *slots, int group_id,
-                     RedMessage *red, QXLPHYSICAL addr)
+static bool red_get_message(QXLInstance *qxl_instance, RedMemSlotInfo *slots, int group_id,
+                            RedMessage *red, QXLPHYSICAL addr)
 {
     QXLMessage *qxl;
     int memslot_id;
@@ -1294,13 +1294,44 @@ bool red_get_message(QXLInstance *qxl_instance, RedMemSlotInfo *slots, int group
     return true;
 }
 
-void red_put_message(RedMessage *red)
+static void red_put_message(RedMessage *red)
 {
     if (red->qxl != NULL) {
         red_qxl_release_resource(red->qxl, red->release_info_ext);
     }
 }
 
+RedMessage *red_message_new(QXLInstance *qxl, RedMemSlotInfo *slots, int group_id, QXLPHYSICAL addr)
+{
+    RedMessage *red;
+
+    red = g_new0(RedMessage, 1);
+
+    red->refs = 1;
+
+    if (!red_get_message(qxl, slots, group_id, red, addr)) {
+        red_message_unref(red);
+        return NULL;
+    }
+
+    return red;
+}
+
+RedMessage *red_message_ref(RedMessage *red)
+{
+    red->refs++;
+    return red;
+}
+
+void red_message_unref(RedMessage *red)
+{
+    if (--red->refs) {
+        return;
+    }
+    red_put_message(red);
+    g_free(red);
+}
+
 static unsigned int surface_format_to_bpp(uint32_t format)
 {
     switch (format) {
diff --git a/server/red-parse-qxl.h b/server/red-parse-qxl.h
index ecf7b1577..fad144071 100644
--- a/server/red-parse-qxl.h
+++ b/server/red-parse-qxl.h
@@ -69,6 +69,7 @@ typedef struct RedUpdateCmd {
 typedef struct RedMessage {
     QXLInstance *qxl;
     QXLReleaseInfoExt release_info_ext;
+    int refs;
     int len;
     uint8_t *data;
 } RedMessage;
@@ -122,9 +123,9 @@ bool red_get_update_cmd(RedMemSlotInfo *slots, int group_id,
                         RedUpdateCmd *red, QXLPHYSICAL addr);
 void red_put_update_cmd(RedUpdateCmd *red);
 
-bool red_get_message(QXLInstance *qxl, RedMemSlotInfo *slots, int group_id,
-                     RedMessage *red, QXLPHYSICAL addr);
-void red_put_message(RedMessage *red);
+RedMessage *red_message_new(QXLInstance *qxl, RedMemSlotInfo *slots, int group_id, QXLPHYSICAL addr);
+RedMessage *red_message_ref(RedMessage *red);
+void red_message_unref(RedMessage *red);
 
 bool red_validate_surface(uint32_t width, uint32_t height,
                           int32_t stride, uint32_t format);
diff --git a/server/red-worker.c b/server/red-worker.c
index aa54dcd85..70d596dd6 100644
--- a/server/red-worker.c
+++ b/server/red-worker.c
@@ -230,16 +230,16 @@ static int red_process_display(RedWorker *worker, int *ring_is_empty)
             break;
         }
         case QXL_CMD_MESSAGE: {
-            RedMessage message;
+            RedMessage *message;
 
-            if (!red_get_message(worker->qxl, &worker->mem_slots, ext_cmd.group_id,
-                                 &message, ext_cmd.cmd.data)) {
+            message = red_message_new(worker->qxl, &worker->mem_slots, ext_cmd.group_id, ext_cmd.cmd.data);
+            if (message == NULL) {
                 break;
             }
 #ifdef DEBUG
             spice_warning("MESSAGE: %.*s", message.len, message.data);
 #endif
-            red_put_message(&message);
+            red_message_unref(message);
             break;
         }
         case QXL_CMD_SURFACE:
-- 
2.19.1

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