drv/imped: add screen notifierdrvmodelv2wip2

this is used to signal drv screens when screens are attached/detached

3 files changed, 27 insertions, 0 deletions

diff --git a/drv/drv_scrnintstr.h b/drv/drv_scrnintstr.h
index 12192b8e9..53ae0b532 100644
--- a/drv/drv_scrnintstr.h
+++ b/drv/drv_scrnintstr.h
@@ -91,6 +91,15 @@ typedef    void (* DrvStoreColorsProcPtr)(
 	int /*ndef*/,
 	xColorItem * /*pdef*/);
 
+#define DRV_ACTION_BIND_SCREEN 1
+#define DRV_ACTION_UNBIND_SCREEN 2
+#define DRV_ACTION_SCREEN_NUM_CHANGE 3
+
+typedef void (*DrvScreenNotifier)(
+    DrvScreenPtr,
+    ScreenPtr,
+    int action, int num_screens);
+
 typedef struct _DrvScreen
 {    /* new driver interface */
 
@@ -128,6 +137,8 @@ typedef struct _DrvScreen
     ResolveColorProcPtr		ResolveColor;
 
     DrvSetScreenPixmapProcPtr SetScreenPixmap;
+
+    DrvScreenNotifier ScreenChange;
     pointer blockData;
     pointer wakeupData;
 
diff --git a/drv/impedplug.c b/drv/impedplug.c
index b4c6a0a03..892cdcb77 100644
--- a/drv/impedplug.c
+++ b/drv/impedplug.c
@@ -157,4 +157,13 @@ Bool impedRemoveDrvScreen(ScreenPtr pScreen, DrvScreenPtr pDrvScreen)
 
     imped_screen->num_gpu--;
 
+    if (pDrvScreen->ScreenChange)
+	(*pDrvScreen->ScreenChange)(pDrvScreen, pScreen, DRV_ACTION_UNBIND_SCREEN, imped_screen->num_gpu);
+
+    for (i = 0; i < imped_screen->num_gpu; i++) {
+	if (imped_screen->gpu[i]->ScreenChange) {
+	  (*imped_screen->gpu[i]->ScreenChange)(imped_screen->gpu[i], pScreen, DRV_ACTION_SCREEN_NUM_CHANGE, imped_screen->num_gpu);
+	}
+    }
+
 }
diff --git a/drv/impedscrn.c b/drv/impedscrn.c
index a32297181..803a5339c 100644
--- a/drv/impedscrn.c
+++ b/drv/impedscrn.c
@@ -537,6 +537,13 @@ void impedAttachDrvScreen(ScreenPtr pScreen, DrvScreenPtr pDrvScreen)
     imped_screen->gpu[i] = pDrvScreen;
     pDrvScreen->pScreen = pScreen;
     imped_screen->num_gpu++;
+
+    for (i = 0; i < imped_screen->num_gpu; i++) {
+	if (imped_screen->gpu[i]->ScreenChange) {
+	    int action = (imped_screen->gpu[i] == pDrvScreen) ? DRV_ACTION_BIND_SCREEN : DRV_ACTION_SCREEN_NUM_CHANGE;
+	    (*imped_screen->gpu[i]->ScreenChange)(pDrvScreen, pScreen, action, imped_screen->num_gpu);
+	}
+    }
 }
 
 struct list drvscreen_list;