diff --git a/libs/ui/include/ui/Gralloc.h b/libs/ui/include/ui/Gralloc.h
index a484bce..1b8a930 100644
--- a/libs/ui/include/ui/Gralloc.h
+++ b/libs/ui/include/ui/Gralloc.h
@@ -31,7 +31,7 @@
 public:
     virtual ~GrallocMapper();
 
-    virtual bool isSupported() const = 0;
+    virtual bool isLoaded() const = 0;
 
     virtual status_t createDescriptor(void* bufferDescriptorInfo,
                                       void* outBufferDescriptor) const = 0;
@@ -74,7 +74,7 @@
 public:
     virtual ~GrallocAllocator();
 
-    virtual bool isSupported() const = 0;
+    virtual bool isLoaded() const = 0;
 
     virtual std::string dumpDebugInfo() const = 0;
 
diff --git a/libs/ui/include/ui/Gralloc2.h b/libs/ui/include/ui/Gralloc2.h
index b23d8f7..4ef9b51 100644
--- a/libs/ui/include/ui/Gralloc2.h
+++ b/libs/ui/include/ui/Gralloc2.h
@@ -36,7 +36,7 @@
 
     Gralloc2Mapper();
 
-    bool isSupported() const override;
+    bool isLoaded() const override;
 
     status_t createDescriptor(void* bufferDescriptorInfo, void* outBufferDescriptor) const override;
 
@@ -76,7 +76,7 @@
     // time.
     Gralloc2Allocator(const Gralloc2Mapper& mapper);
 
-    bool isSupported() const override;
+    bool isLoaded() const override;
 
     std::string dumpDebugInfo() const override;
 
diff --git a/libs/ui/include/ui/Gralloc3.h b/libs/ui/include/ui/Gralloc3.h
index b0cbcc1..879e96e 100644
--- a/libs/ui/include/ui/Gralloc3.h
+++ b/libs/ui/include/ui/Gralloc3.h
@@ -35,7 +35,7 @@
 
     Gralloc3Mapper();
 
-    bool isSupported() const override;
+    bool isLoaded() const override;
 
     status_t createDescriptor(void* bufferDescriptorInfo, void* outBufferDescriptor) const override;
 
@@ -74,7 +74,7 @@
     // time.
     Gralloc3Allocator(const Gralloc3Mapper& mapper);
 
-    bool isSupported() const override;
+    bool isLoaded() const override;
 
     std::string dumpDebugInfo() const override;
 
diff --git a/libs/ui/include/ui/GraphicBuffer.h b/libs/ui/include/ui/GraphicBuffer.h
index b73ca2b..18a27a0 100644
--- a/libs/ui/include/ui/GraphicBuffer.h
+++ b/libs/ui/include/ui/GraphicBuffer.h
@@ -169,8 +169,12 @@
     bool needsReallocation(uint32_t inWidth, uint32_t inHeight,
             PixelFormat inFormat, uint32_t inLayerCount, uint64_t inUsage);
 
-    status_t lock(uint32_t inUsage, void** vaddr);
-    status_t lock(uint32_t inUsage, const Rect& rect, void** vaddr);
+    // For the following two lock functions, if bytesPerStride or bytesPerPixel
+    // are unknown or variable, -1 will be returned
+    status_t lock(uint32_t inUsage, void** vaddr, int32_t* outBytesPerPixel = nullptr,
+                  int32_t* outBytesPerStride = nullptr);
+    status_t lock(uint32_t inUsage, const Rect& rect, void** vaddr,
+                  int32_t* outBytesPerPixel = nullptr, int32_t* outBytesPerStride = nullptr);
     // For HAL_PIXEL_FORMAT_YCbCr_420_888
     status_t lockYCbCr(uint32_t inUsage, android_ycbcr *ycbcr);
     status_t lockYCbCr(uint32_t inUsage, const Rect& rect,