Add a debug option to turn the "transformation hint" off

transformation hint is disabled with:

   adb shell service call SurfaceFlinger 1009 i32 1

Change-Id: I9aafe6f280f88ce41569ed69a06dc522b10e3a88

services/surfaceflinger/Layer.cpp

@@ -541,9 +541,9 @@ void Layer::dump(String8& result, char* buffer, size_t SIZE) const
     snprintf(buffer, SIZE,
             "      "
             "format=%2d, activeBuffer=[%4ux%4u:%4u,%3X],"
-            " freezeLock=%p, queued-frames=%d\n",
+            " freezeLock=%p, transform-hint=0x%02x, queued-frames=%d\n",
             mFormat, w0, h0, s0,f0,
-            getFreezeLock().get(), mQueuedFrames);
+            getFreezeLock().get(), getTransformHint(), mQueuedFrames);
 
     result.append(buffer);
 
@@ -562,6 +562,17 @@ uint32_t Layer::getEffectiveUsage(uint32_t usage) const
     return usage;
 }
 
+uint32_t Layer::getTransformHint() const {
+    uint32_t orientation = 0;
+    if (!mFlinger->mDebugDisableTransformHint) {
+        orientation = getOrientation();
+        if (orientation & Transform::ROT_INVALID) {
+            orientation = 0;
+        }
+    }
+    return orientation;
+}
+
 // ---------------------------------------------------------------------------
 
 

services/surfaceflinger/Layer.h

@@ -89,6 +89,7 @@ private:
     void onFrameQueued();
     virtual sp<ISurface> createSurface();
     uint32_t getEffectiveUsage(uint32_t usage) const;
+    uint32_t getTransformHint() const;
     bool isCropped() const;
     static bool getOpacityForFormat(uint32_t format);
 

services/surfaceflinger/SurfaceFlinger.cpp

@@ -93,6 +93,7 @@ SurfaceFlinger::SurfaceFlinger()
         mDebugBackground(0),
         mDebugDDMS(0),
         mDebugDisableHWC(0),
+        mDebugDisableTransformHint(0),
         mDebugInSwapBuffers(0),
         mLastSwapBufferTime(0),
         mDebugInTransaction(0),
@@ -1689,6 +1690,12 @@ status_t SurfaceFlinger::onTransact(
                 invalidateHwcGeometry();
                 repaintEverything();
                 return NO_ERROR;
+            case 1009:  // toggle use of transform hint
+                n = data.readInt32();
+                mDebugDisableTransformHint = n ? 1 : 0;
+                invalidateHwcGeometry();
+                repaintEverything();
+                return NO_ERROR;
             case 1010:  // interrogate.
                 reply->writeInt32(0);
                 reply->writeInt32(0);

services/surfaceflinger/SurfaceFlinger.h

@@ -374,6 +374,7 @@ private:
                 int                         mDebugBackground;
                 int                         mDebugDDMS;
                 int                         mDebugDisableHWC;
+                int                         mDebugDisableTransformHint;
                 volatile nsecs_t            mDebugInSwapBuffers;
                 nsecs_t                     mLastSwapBufferTime;
                 volatile nsecs_t            mDebugInTransaction;

services/surfaceflinger/SurfaceTextureLayer.cpp

@@ -57,16 +57,10 @@ status_t SurfaceTextureLayer::queueBuffer(int buf, int64_t timestamp,
 
     status_t res = SurfaceTexture::queueBuffer(buf, timestamp,
             outWidth, outHeight, outTransform);
-
     sp<Layer> layer(mLayer.promote());
     if (layer != NULL) {
-        uint32_t orientation = layer->getOrientation();
+        *outTransform = layer->getTransformHint();
-        if (orientation & Transform::ROT_INVALID) {
-            orientation = 0;
-        }
-        *outTransform = orientation;
     }
-
     return res;
 }