hwc: On downscale check swap on 90 transform

While checking for valid dimensions, take 90 transform into
account while calculating downscales.

b/14225977

Change-Id: Ie8b527c8263a5eb366ae2a4adaa2ffbbf270ba50

msm8226/libhwcomposer/hwc_mdpcomp.cpp

@@ -348,8 +348,9 @@ bool MDPComp::isValidDimension(hwc_context_t *ctx, hwc_layer_1_t *layer) {
 
     hwc_rect_t crop = integerizeSourceCrop(layer->sourceCropf);
     hwc_rect_t dst = layer->displayFrame;
-    int crop_w = crop.right - crop.left;
-    int crop_h = crop.bottom - crop.top;
+    bool rotated90 = (bool)layer->transform & HAL_TRANSFORM_ROT_90;
+    int crop_w = rotated90 ? crop.bottom - crop.top : crop.right - crop.left;
+    int crop_h = rotated90 ? crop.right - crop.left : crop.bottom - crop.top;
     int dst_w = dst.right - dst.left;
     int dst_h = dst.bottom - dst.top;
     float w_scale = ((float)crop_w / (float)dst_w);