surfaceflinger: clean up captureScreen

dispScissor is never empty.  Remove the check and update the
comments so that the intention is clear.

It also becomes obvious that reqWidth/reqHeight is never zero when
we reach "// get screen geometry".  All code following the comment
is actually dead, which means we probably broke it since commit
06a58e22.

Bug: 113041375
Test: take screenshot, rotate screen, screencap
Change-Id: Ida1430383ce62271365d9ef64ad9b055638e1eac
diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index 48eec61..bc176fd 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -5082,34 +5082,18 @@
         display = getDisplayDeviceLocked(displayToken);
         if (!display) return BAD_VALUE;
 
-        const Rect& dispScissor = display->getScissor();
-        if (!dispScissor.isEmpty()) {
-            sourceCrop.set(dispScissor);
-            // adb shell screencap will default reqWidth and reqHeight to zeros.
-            if (reqWidth == 0 || reqHeight == 0) {
-                reqWidth = uint32_t(display->getViewport().width());
-                reqHeight = uint32_t(display->getViewport().height());
-            }
+        // set the source crop to the (projected) logical display viewport
+        // unconditionally until the framework is fixed
+        sourceCrop.set(display->getScissor());
+
+        // set the requested width/height to the logical display viewport size
+        // by default
+        if (reqWidth == 0 || reqHeight == 0) {
+            reqWidth = uint32_t(display->getViewport().width());
+            reqHeight = uint32_t(display->getViewport().height());
         }
 
-        // get screen geometry
-        uint32_t width = display->getWidth();
-        uint32_t height = display->getHeight();
-
-        if (renderAreaRotation & ui::Transform::ROT_90) {
-            std::swap(width, height);
-        }
-
-        if (mPrimaryDisplayOrientation & DisplayState::eOrientationSwapMask) {
-            std::swap(width, height);
-        }
-
-        if (reqWidth == 0) {
-            reqWidth = width;
-        }
-        if (reqHeight == 0) {
-            reqHeight = height;
-        }
+        // XXX mPrimaryDisplayOrientation is ignored
     }
 
     DisplayRenderArea renderArea(display, sourceCrop, reqWidth, reqHeight, renderAreaRotation);