diff --git a/libs/ui/Gralloc2.cpp b/libs/ui/Gralloc2.cpp
index 2c4b5f3..92ea07c 100644
--- a/libs/ui/Gralloc2.cpp
+++ b/libs/ui/Gralloc2.cpp
@@ -94,7 +94,7 @@
     mMapperV2_1 = IMapper::castFrom(mMapper);
 }
 
-bool Gralloc2Mapper::isSupported() const {
+bool Gralloc2Mapper::isLoaded() const {
     return mMapper != nullptr;
 }
 
@@ -359,7 +359,7 @@
     }
 }
 
-bool Gralloc2Allocator::isSupported() const {
+bool Gralloc2Allocator::isLoaded() const {
     return mAllocator != nullptr;
 }
 
diff --git a/libs/ui/Gralloc3.cpp b/libs/ui/Gralloc3.cpp
index acb6b01..306a74b 100644
--- a/libs/ui/Gralloc3.cpp
+++ b/libs/ui/Gralloc3.cpp
@@ -92,7 +92,7 @@
     }
 }
 
-bool Gralloc3Mapper::isSupported() const {
+bool Gralloc3Mapper::isLoaded() const {
     return mMapper != nullptr;
 }
 
@@ -322,7 +322,7 @@
     }
 }
 
-bool Gralloc3Allocator::isSupported() const {
+bool Gralloc3Allocator::isLoaded() const {
     return mAllocator != nullptr;
 }
 
diff --git a/libs/ui/GraphicBuffer.cpp b/libs/ui/GraphicBuffer.cpp
index da24cf1..15597eb 100644
--- a/libs/ui/GraphicBuffer.cpp
+++ b/libs/ui/GraphicBuffer.cpp
@@ -236,15 +236,15 @@
     return NO_ERROR;
 }
 
-status_t GraphicBuffer::lock(uint32_t inUsage, void** vaddr)
-{
+status_t GraphicBuffer::lock(uint32_t inUsage, void** vaddr, int32_t* outBytesPerPixel,
+                             int32_t* outBytesPerStride) {
     const Rect lockBounds(width, height);
-    status_t res = lock(inUsage, lockBounds, vaddr);
+    status_t res = lock(inUsage, lockBounds, vaddr, outBytesPerPixel, outBytesPerStride);
     return res;
 }
 
-status_t GraphicBuffer::lock(uint32_t inUsage, const Rect& rect, void** vaddr)
-{
+status_t GraphicBuffer::lock(uint32_t inUsage, const Rect& rect, void** vaddr,
+                             int32_t* outBytesPerPixel, int32_t* outBytesPerStride) {
     if (rect.left < 0 || rect.right  > width ||
         rect.top  < 0 || rect.bottom > height) {
         ALOGE("locking pixels (%d,%d,%d,%d) outside of buffer (w=%d, h=%d)",
@@ -252,10 +252,10 @@
                 width, height);
         return BAD_VALUE;
     }
-    int32_t bytesPerPixel, bytesPerStride;
 
-    status_t res =
-            getBufferMapper().lock(handle, inUsage, rect, vaddr, &bytesPerPixel, &bytesPerStride);
+    status_t res = getBufferMapper().lock(handle, inUsage, rect, vaddr, outBytesPerPixel,
+                                          outBytesPerStride);
+
     return res;
 }
 
diff --git a/libs/ui/GraphicBufferAllocator.cpp b/libs/ui/GraphicBufferAllocator.cpp
index efb5798..5a67dc4 100644
--- a/libs/ui/GraphicBufferAllocator.cpp
+++ b/libs/ui/GraphicBufferAllocator.cpp
@@ -48,12 +48,12 @@
 GraphicBufferAllocator::GraphicBufferAllocator() : mMapper(GraphicBufferMapper::getInstance()) {
     mAllocator = std::make_unique<const Gralloc3Allocator>(
             reinterpret_cast<const Gralloc3Mapper&>(mMapper.getGrallocMapper()));
-    if (!mAllocator->isSupported()) {
+    if (!mAllocator->isLoaded()) {
         mAllocator = std::make_unique<const Gralloc2Allocator>(
                 reinterpret_cast<const Gralloc2Mapper&>(mMapper.getGrallocMapper()));
     }
 
-    if (!mAllocator->isSupported()) {
+    if (!mAllocator->isLoaded()) {
         LOG_ALWAYS_FATAL("gralloc-allocator is missing");
     }
 }
diff --git a/libs/ui/GraphicBufferMapper.cpp b/libs/ui/GraphicBufferMapper.cpp
index 9e36377..79c333f 100644
--- a/libs/ui/GraphicBufferMapper.cpp
+++ b/libs/ui/GraphicBufferMapper.cpp
@@ -51,11 +51,11 @@
 
 GraphicBufferMapper::GraphicBufferMapper() {
     mMapper = std::make_unique<const Gralloc3Mapper>();
-    if (!mMapper->isSupported()) {
+    if (!mMapper->isLoaded()) {
         mMapper = std::make_unique<const Gralloc2Mapper>();
     }
 
-    if (!mMapper->isSupported()) {
+    if (!mMapper->isLoaded()) {
         LOG_ALWAYS_FATAL("gralloc-mapper is missing");
     }
 }
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,