hwc: Pull in updates from exynos3 hwc

Change-Id: I61e1556da3e2d1e9a8b9c22163f4f11982bda7dc

exynos4/hal/libhwcomposer/SecHWC.cpp

@@ -527,12 +527,17 @@ static void get_hwc_ui_lay_skipdraw_decision(struct hwc_context_t* ctx,
 static int hwc_prepare(hwc_composer_device_1_t *dev, size_t numDisplays, hwc_display_contents_1_t** displays)
 {
 
-    for (uint32_t i = 0; i < numDisplays; i++) {
-        hwc_display_contents_1_t *list = displays[i];  
     struct hwc_context_t* ctx = (struct hwc_context_t*)dev;
     int overlay_win_cnt = 0;
     int compositionType = 0;
     int ret;
+
+    // Compat
+    hwc_display_contents_1_t* list = NULL;
+    if (numDisplays > 0) {
+        list = displays[0];
+    }
+
 #if defined(BOARD_USES_HDMI)
     android::SecHdmiClient *mHdmiClient = android::SecHdmiClient::getInstance();
     int hdmi_cable_status = (int)mHdmiClient->getHdmiCableStatus();
@@ -656,7 +661,7 @@ static int hwc_prepare(hwc_composer_device_1_t *dev, size_t numDisplays, hwc_dis
             reset_win_rect_info(&ctx->win[i]);
         }
     }
-    }
+
     return 0;
 }
 
@@ -675,8 +680,6 @@ static int hwc_set(hwc_composer_device_1_t *dev,
     struct sec_rect src_work_rect;
     struct sec_rect dst_work_rect;
     bool need_swap_buffers = ctx->num_of_fb_layer > 0;
-    for (uint32_t i = 0; i < numDisplays; i++) {
-        hwc_display_contents_1_t* list = displays[i];      
 
     memset(&src_img, 0, sizeof(src_img));
     memset(&dst_img, 0, sizeof(dst_img));
@@ -688,6 +691,9 @@ static int hwc_set(hwc_composer_device_1_t *dev,
     int rotVal = 0;
 #endif
 
+    // Only support one display
+    hwc_display_contents_1_t* list = displays[0];
+
     if (!list) {
         //turn off the all windows
         for (int i = 0; i < NUM_OF_WIN; i++) {
@@ -887,7 +893,7 @@ static int hwc_set(hwc_composer_device_1_t *dev,
         }
     }
 #endif
-    }
+
     return 0;
 }
 
@@ -1036,12 +1042,22 @@ static int hwc_device_close(struct hw_device_t *dev)
     }
     return ret;
 }
+
 static int hwc_blank(struct hwc_composer_device_1 *dev, int dpy, int blank)
 {
-    // We're using an older method of screen blanking based on
-    // early_suspend in the kernel.  No need to do anything here.
+    struct hwc_context_t* ctx = (struct hwc_context_t*)dev;
+    if (blank) {
+        // release our resources, the screen is turning off
+        // in our case, there is nothing to do.
+        ctx->num_of_fb_layer_prev = 0;
         return 0;
+    }
+    else {
+        // No need to unblank, will unblank on set()
+        return 0;
+    }
 }
+
 static int hwc_device_open(const struct hw_module_t* module, const char* name,
         struct hw_device_t** device)
 {