Protected surface API

To be used by DRM framework, implemented by display HAL

Change-Id: I054a07a94f4d5dbe792f3a597e2e49a100d90eb2

include/surfaceflinger/ISurfaceComposer.h

@@ -44,6 +44,8 @@ public:
         eSecure             = 0x00000080,
         eNonPremultiplied   = 0x00000100,
         eOpaque             = 0x00000400,
+        eProtectedByApp     = 0x00000800,
+        eProtectedByDRM     = 0x00001000,
 
         eFXSurfaceNormal    = 0x00000000,
         eFXSurfaceBlur      = 0x00010000,

include/ui/GraphicBuffer.h

@@ -54,9 +54,11 @@ public:
         USAGE_SW_WRITE_RARELY   = GRALLOC_USAGE_SW_WRITE_RARELY,
         USAGE_SW_WRITE_OFTEN    = GRALLOC_USAGE_SW_WRITE_OFTEN,
         USAGE_SW_WRITE_MASK     = GRALLOC_USAGE_SW_WRITE_MASK,
-        
+
         USAGE_SOFTWARE_MASK     = USAGE_SW_READ_MASK|USAGE_SW_WRITE_MASK,
-        
+
+        USAGE_PROTECTED         = GRALLOC_USAGE_PROTECTED,
+
         USAGE_HW_TEXTURE        = GRALLOC_USAGE_HW_TEXTURE,
         USAGE_HW_RENDER         = GRALLOC_USAGE_HW_RENDER,
         USAGE_HW_2D             = GRALLOC_USAGE_HW_2D,

services/surfaceflinger/Layer.cpp

@@ -56,6 +56,8 @@ Layer::Layer(SurfaceFlinger* flinger,
         mNeedsBlending(true),
         mNeedsDithering(false),
         mSecure(false),
+        mProtectedByApp(false),
+        mProtectedByDRM(false),
         mTextureManager(),
         mBufferManager(mTextureManager),
         mWidth(0), mHeight(0), mNeedsScaling(false), mFixedSize(false)
@@ -191,6 +193,8 @@ status_t Layer::setBuffers( uint32_t w, uint32_t h,
     mReqHeight = h;
 
     mSecure = (flags & ISurfaceComposer::eSecure) ? true : false;
+    mProtectedByApp = (flags & ISurfaceComposer::eProtectedByApp) ? true : false;
+    mProtectedByDRM = (flags & ISurfaceComposer::eProtectedByDRM) ? true : false;
     mNeedsBlending = (info.h_alpha - info.l_alpha) > 0 &&
             (flags & ISurfaceComposer::eOpaque) == 0;
 
@@ -476,6 +480,10 @@ uint32_t Layer::getEffectiveUsage(uint32_t usage) const
         // request EGLImage for all buffers
         usage |= GraphicBuffer::USAGE_HW_TEXTURE;
     }
+    if (mProtectedByApp || mProtectedByDRM) {
+        // need a hardware-protected path to external video sink
+        usage |= GraphicBuffer::USAGE_PROTECTED;
+    }
     return usage;
 }
 

services/surfaceflinger/Layer.h

@@ -79,6 +79,8 @@ public:
     virtual bool needsDithering() const     { return mNeedsDithering; }
     virtual bool needsFiltering() const;
     virtual bool isSecure() const           { return mSecure; }
+    virtual bool isProtectedByApp() const   { return mProtectedByApp; }
+    virtual bool isProtectedByDRM() const   { return mProtectedByDRM; }
     virtual sp<Surface> createSurface() const;
     virtual status_t ditch();
     virtual void onRemoved();
@@ -218,7 +220,9 @@ private:
     bool mNeedsDithering;
 
     // page-flip thread (currently main thread)
-    bool mSecure;
+    bool mSecure;         // no screenshots
+    bool mProtectedByApp; // application requires protected path to external sink
+    bool mProtectedByDRM; // DRM agent requires protected path to external sink
     Region mPostedDirtyRegion;
 
     // page-flip thread and transaction thread (currently main thread)

services/surfaceflinger/LayerBase.h

@@ -196,6 +196,18 @@ public:
      */
     virtual bool isSecure() const       { return false; }
 
+    /**
+     * isProtectedByApp - true if application says this surface is protected, that
+     * is if it requires a hardware-protected data path to an external sink.
+     */
+    virtual bool isProtectedByApp() const   { return false; }
+
+    /**
+     * isProtectedByDRM - true if DRM agent says this surface is protected, that
+     * is if it requires a hardware-protected data path to an external sink.
+     */
+    virtual bool isProtectedByDRM() const   { return false; }
+
     /** Called from the main thread, when the surface is removed from the
      * draw list */
     virtual status_t ditch() { return NO_ERROR; }

services/surfaceflinger/LayerDim.h

@@ -42,8 +42,10 @@ public:
         virtual ~LayerDim();
 
     virtual void onDraw(const Region& clip) const;
-    virtual bool needsBlending() const  { return true; }
-    virtual bool isSecure() const       { return false; }
+    virtual bool needsBlending() const    { return true; }
+    virtual bool isSecure() const         { return false; }
+    virtual bool isProtectedByApp() const { return false; }
+    virtual bool isProtectedByDRM() const { return false; }
     virtual const char* getTypeId() const { return "LayerDim"; }
 
     static void initDimmer(SurfaceFlinger* flinger, uint32_t w, uint32_t h);