hwc: Map dirtyRect to layer destination before using.

DirtyRect for a layer is generated w.r.t to its buffer
coordinates. It needs to be mapped for layer destination
(display) coordinates before using it to calculate the frame's
ROI.

Change-Id: Id86f495b2016da2cfd5aed4d86bff6d3035abf10

msm8226/libhwcomposer/hwc_mdpcomp.cpp

@@ -581,11 +581,17 @@ void MDPCompSplit::generateROI(hwc_context_t *ctx,
         hwc_layer_1_t* layer = &list->hwLayers[index];
         if ((mCachedFrame.hnd[index] != layer->handle) ||
                 isYuvBuffer((private_handle_t *)layer->handle)) {
-            hwc_rect_t updatingRect = layer->displayFrame;
+            hwc_rect_t dst = layer->displayFrame;
+            hwc_rect_t updatingRect = dst;
 
 #ifdef QCOM_BSP
             if(!needsScaling(layer) && !layer->transform)
-                updatingRect =  layer->dirtyRect;
+            {
+                hwc_rect_t src = integerizeSourceCrop(layer->sourceCropf);
+                int x_off = dst.left - src.left;
+                int y_off = dst.top - src.top;
+                updatingRect = moveRect(layer->dirtyRect, x_off, y_off);
+            }
 #endif
 
             hwc_rect_t l_dst  = getIntersection(l_frame, updatingRect);

msm8226/libhwcomposer/hwc_utils.cpp

@@ -1086,6 +1086,21 @@ bool operator ==(const hwc_rect_t& lhs, const hwc_rect_t& rhs) {
     return false;
 }
 
+hwc_rect_t moveRect(const hwc_rect_t& rect, const int& x_off, const int& y_off)
+{
+    hwc_rect_t res;
+
+    if(!isValidRect(rect))
+        return (hwc_rect_t){0, 0, 0, 0};
+
+    res.left = rect.left + x_off;
+    res.top = rect.top + y_off;
+    res.right = rect.right + x_off;
+    res.bottom = rect.bottom + y_off;
+
+    return res;
+}
+
 /* computes the intersection of two rects */
 hwc_rect_t getIntersection(const hwc_rect_t& rect1, const hwc_rect_t& rect2)
 {

msm8226/libhwcomposer/hwc_utils.h

@@ -262,6 +262,7 @@ int getExtOrientation(hwc_context_t* ctx);
 bool isValidRect(const hwc_rect_t& rect);
 hwc_rect_t deductRect(const hwc_rect_t& rect1, const hwc_rect_t& rect2);
 bool isSameRect(const hwc_rect& rect1, const hwc_rect& rect2);
+hwc_rect_t moveRect(const hwc_rect_t& rect, const int& x_off, const int& y_off);
 hwc_rect_t getIntersection(const hwc_rect_t& rect1, const hwc_rect_t& rect2);
 hwc_rect_t getUnion(const hwc_rect_t& rect1, const hwc_rect_t& rect2);
 void optimizeLayerRects(const hwc_display_contents_1_t *list);