Port adjust_src_dst_region_for_blitframebuffer workaround to ANGLE.

include/platform/FeaturesGL.h

@@ -323,6 +323,14 @@ struct FeaturesGL : FeatureSetBase
         "Limit max 3d texture size and max array texture layers to 1024 to avoid system hang on "
         "older Intel Linux",
         &members, "http://crbug.com/927470"};
+
+    // BlitFramebuffer has issues on some platforms with large source/dest texture sizes. This
+    // workaround adjusts the destination rectangle source and dest rectangle to fit within maximum
+    // twice the size of the framebuffer.
+    Feature adjustSrcDstRegionBlitFramebuffer = {
+        "adjust_src_dst_region_for_blitframebuffer", FeatureCategory::OpenGLWorkarounds,
+        "Many platforms have issues with blitFramebuffer when the parameters are large.", &members,
+        "http://crbug.com/830046"};
 };
 
 inline FeaturesGL::FeaturesGL()  = default;

src/common/third_party/base/anglebase/numerics/safe_math.h

@@ -89,6 +89,14 @@ class CheckedNumeric
     // IsValid() is the public API to test if a CheckedNumeric is currently valid.
     bool IsValid() const { return validity() == RANGE_VALID; }
 
+    // AssignIfValid(Dst) - Assigns the underlying value if it is currently valid and is within the
+    // range supported by the destination type. Returns true if successful and false otherwise.
+    template <typename Dst>
+    constexpr bool AssignIfValid(Dst *result) const
+    {
+        return IsValid() ? ((*result = static_cast<Dst>(state_.value())), true) : false;
+    }
+
     // ValueOrDie() The primary accessor for the underlying value. If the current
     // state is not valid it will CHECK and crash.
     T ValueOrDie() const

src/libANGLE/Framebuffer.cpp

@@ -602,10 +602,15 @@ int FramebufferState::getBaseViewIndex() const
 
 Box FramebufferState::getDimensions() const
 {
+    Extents extents = getExtents();
+    return Box(0, 0, 0, extents.width, extents.height, extents.depth);
+}
+
+Extents FramebufferState::getExtents() const
+{
     ASSERT(attachmentsHaveSameDimensions());
     ASSERT(getFirstNonNullAttachment() != nullptr);
-    Extents extents = getFirstNonNullAttachment()->getSize();
-    return Box(0, 0, 0, extents.width, extents.height, extents.depth);
+    return getFirstNonNullAttachment()->getSize();
 }
 
 Framebuffer::Framebuffer(const Caps &caps, rx::GLImplFactory *factory, GLuint id)
@@ -2285,6 +2290,11 @@ Box Framebuffer::getDimensions() const
     return mState.getDimensions();
 }
 
+Extents Framebuffer::getExtents() const
+{
+    return mState.getExtents();
+}
+
 angle::Result Framebuffer::ensureBufferInitialized(const Context *context,
                                                    GLenum bufferType,
                                                    GLint bufferIndex)

src/libANGLE/Framebuffer.h

@@ -82,6 +82,7 @@ class FramebufferState final : angle::NonCopyable
     bool hasSeparateDepthAndStencilAttachments() const;
     bool colorAttachmentsAreUniqueImages() const;
     Box getDimensions() const;
+    Extents getExtents() const;
 
     const FramebufferAttachment *getDrawBuffer(size_t drawBufferIdx) const;
     size_t getDrawBufferCount() const;
@@ -202,6 +203,7 @@ class Framebuffer final : public angle::ObserverInterface,
     bool readDisallowedByMultiview() const;
     GLsizei getNumViews() const;
     GLint getBaseViewIndex() const;
+    Extents getExtents() const;
 
     size_t getDrawbufferStateCount() const;
     GLenum getDrawBufferState(size_t drawBuffer) const;

src/libANGLE/renderer/gl/FramebufferGL.h

@@ -115,6 +115,12 @@ class FramebufferGL : public FramebufferImpl
     void maskOutInactiveOutputDrawBuffersImpl(const gl::Context *context,
                                               gl::DrawBufferMask targetAppliedDrawBuffers);
 
+    angle::Result adjustSrcDstRegion(const gl::Context *context,
+                                     const gl::Rectangle &sourceArea,
+                                     const gl::Rectangle &destArea,
+                                     gl::Rectangle *newSourceArea,
+                                     gl::Rectangle *newDestArea);
+
     GLuint mFramebufferID;
     bool mIsDefault;
 

src/libANGLE/renderer/gl/renderergl_utils.cpp

@@ -1531,6 +1531,9 @@ void InitializeFeatures(const FunctionsGL *functions, angle::FeaturesGL *feature
 
     features->clearToZeroOrOneBroken.enabled =
         IsApple() && IsIntel(vendor) && GetMacOSVersion() < OSVersion(10, 12, 6);
+
+    features->adjustSrcDstRegionBlitFramebuffer.enabled =
+        IsApple() || IsLinux() || (IsAndroid() && IsNvidia(vendor));
 }
 
 void InitializeFrontendFeatures(const FunctionsGL *functions, angle::FrontendFeatures *features)