Attachment 425715 Details for Bug 224306 – Patch

[patch] Patch

bug-224306-20210411170237.patch (text/plain), 39.14 KB, created by Said Abou-Hallawa on 2021-04-11 17:02:38 PDT

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Creator: Said Abou-Hallawa

Created: 2021-04-11 17:02:38 PDT

Size: 39.14 KB

patch

obsolete

>Subversion Revision: 275810
>diff --git a/Source/WebCore/ChangeLog b/Source/WebCore/ChangeLog
>index 4656fba5ae49bd823f7bcd0b5e80cd2e644f5495..6444a14feeb4fc60858ac76c9ef1b7133dd81b58 100644
>--- a/Source/WebCore/ChangeLog
>+++ b/Source/WebCore/ChangeLog
>@@ -1,3 +1,67 @@
>+2021-04-11  Said Abou-Hallawa  <said@apple.com>
>+
>+        [GPU Process] Make ImageBuffer calculate its memoryCost() from its size
>+        https://bugs.webkit.org/show_bug.cgi?id=224306
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        Instead of round-trip processes to get the backend memoryCost(), we can 
>+        calculate it from the size and the bytes alignment of each row in the
>+        backend. These are static values so in the case of RemoteImageBufferProxy,
>+        there is no need to ensure the backend is created in GPUP and it is mapped
>+        in the Web Process.
>+
>+        * platform/graphics/ConcreteImageBuffer.h:
>+        * platform/graphics/ImageBufferBackend.cpp:
>+        (WebCore::ImageBufferBackend::calculateBackendSize):
>+        (WebCore::ImageBufferBackend::calculateMemoryCost):
>+        (WebCore::ImageBufferBackend::ImageBufferBackend):
>+        * platform/graphics/ImageBufferBackend.h:
>+        (WebCore::ImageBufferBackend::calculateExternalMemoryCost):
>+        (WebCore::ImageBufferBackend::memoryCost const): Deleted.
>+        (WebCore::ImageBufferBackend::externalMemoryCost const): Deleted.
>+        (WebCore::ImageBufferBackend::bytesPerRow const): Deleted.
>+        - This is the general case of the backend which is 4-bytes aligned rows.
>+        - calculateSafeBackendSize() returns the size whose bytesPerRow does not
>+        overflow unsigned and whose memoryCost does not not overflow size_t.
>+
>+        * platform/graphics/cairo/ImageBufferCairoImageSurfaceBackend.cpp:
>+        (WebCore::ImageBufferCairoImageSurfaceBackend::calculateSafeBackendSize):
>+        (WebCore::ImageBufferCairoImageSurfaceBackend::calculateBytesPerRow):
>+        (WebCore::ImageBufferCairoImageSurfaceBackend::calculateMemoryCost):
>+        (WebCore::ImageBufferCairoImageSurfaceBackend::create):
>+        (WebCore::ImageBufferCairoImageSurfaceBackend::bytesPerRow const):
>+        * platform/graphics/cairo/ImageBufferCairoImageSurfaceBackend.h:
>+        cairo_format_stride_for_width() is used to calculate the bytesPerRow()
>+        for Cairo port.
>+
>+        * platform/graphics/cg/ImageBufferCGBackend.cpp:
>+        (WebCore::ImageBufferCGBackend::calculateBytesPerRow):
>+        * platform/graphics/cg/ImageBufferCGBackend.h:
>+        This is the CG case when the backend is 4-bytes aligned rows.
>+
>+        * platform/graphics/cg/ImageBufferCGBitmapBackend.cpp:
>+        (WebCore::ImageBufferCGBitmapBackend::calculateSafeBackendSize):
>+        (WebCore::ImageBufferCGBitmapBackend::calculateMemoryCost):
>+        (WebCore::ImageBufferCGBitmapBackend::create):
>+        (WebCore::ImageBufferCGBitmapBackend::bytesPerRow const):
>+        * platform/graphics/cg/ImageBufferCGBitmapBackend.h:
>+        This is the CG bitmap case where the backend is 4-bytes aligned rows.
>+
>+        * platform/graphics/cg/ImageBufferIOSurfaceBackend.cpp:
>+        (WebCore::ImageBufferIOSurfaceBackend::calculateSafeBackendSize):
>+        (WebCore::ImageBufferIOSurfaceBackend::calculateBytesPerRow):
>+        (WebCore::ImageBufferIOSurfaceBackend::calculateMemoryCost):
>+        (WebCore::ImageBufferIOSurfaceBackend::calculateExternalMemoryCost):
>+        (WebCore::ImageBufferIOSurfaceBackend::create):
>+        (WebCore::ImageBufferIOSurfaceBackend::context const):
>+        (WebCore::ImageBufferIOSurfaceBackend::calculateBackendSize): Deleted.
>+        (WebCore::ImageBufferIOSurfaceBackend::memoryCost const): Deleted.
>+        (WebCore::ImageBufferIOSurfaceBackend::externalMemoryCost const): Deleted.
>+        * platform/graphics/cg/ImageBufferIOSurfaceBackend.h:
>+        IOSurfaceAlignProperty() is used to align the CG bytesPerRow to the proper
>+        IOSurface alignment.
>+
> 2021-04-11  Darin Adler  <darin@apple.com>
> 
>         [Mac] Add a missing null check to slider thumb focus rendering
>diff --git a/Source/WebKit/ChangeLog b/Source/WebKit/ChangeLog
>index 18c9fde36e0913b69eef87ef0277b352cecb1ad5..eb48694d1b0d147897a97765bafdec06b9274d64 100644
>--- a/Source/WebKit/ChangeLog
>+++ b/Source/WebKit/ChangeLog
>@@ -1,3 +1,41 @@
>+2021-04-11  Said Abou-Hallawa  <said@apple.com>
>+
>+        [GPU Process] Make ImageBuffer calculate its memoryCost() from its size
>+        https://bugs.webkit.org/show_bug.cgi?id=224306
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * Shared/ShareableBitmap.h:
>+        Make ShareableBitmap::calculateBytesPerRow() public.
>+
>+        * WebProcess/GPU/graphics/ImageBufferShareableBitmapBackend.cpp:
>+        (WebKit::ImageBufferShareableBitmapBackend::configuration):
>+        (WebKit::ImageBufferShareableBitmapBackend::calculateSafeBackendSize):
>+        (WebKit::ImageBufferShareableBitmapBackend::calculateBytesPerRow):
>+        (WebKit::ImageBufferShareableBitmapBackend::calculateMemoryCost):
>+        (WebKit::ImageBufferShareableBitmapBackend::create):
>+        * WebProcess/GPU/graphics/ImageBufferShareableBitmapBackend.h:
>+        ShareableBitmap::calculateBytesPerRow() is used to get the bytesPerRow()
>+        by giving it the scaled backend size.
>+
>+        * WebProcess/GPU/graphics/RemoteImageBufferProxy.h:
>+        (WebKit::RemoteImageBufferProxy::create):
>+        Use the new name of the function calculateSafeBackendSize().
>+
>+        * WebProcess/GPU/graphics/cocoa/ImageBufferShareableIOSurfaceBackend.cpp:
>+        (WebKit::ImageBufferShareableIOSurfaceBackend::calculateSafeBackendSize):
>+        (WebKit::ImageBufferShareableIOSurfaceBackend::calculateMemoryCost):
>+        (WebKit::ImageBufferShareableIOSurfaceBackend::calculateExternalMemoryCost):
>+        (WebKit::ImageBufferShareableIOSurfaceBackend::bytesPerRow const):
>+        * WebProcess/GPU/graphics/cocoa/ImageBufferShareableIOSurfaceBackend.h:
>+        Implement these static functions and make them call the corresponding 
>+        functions from ImageBufferIOSurfaceBackend because this class is derived
>+        from ImageBufferBackend.
>+
>+        * WebProcess/GPU/graphics/cocoa/ImageBufferShareableMappedIOSurfaceBackend.cpp:
>+        (WebKit::ImageBufferShareableMappedIOSurfaceBackend::create):
>+        Use the new name of the function calculateSafeBackendSize().
>+
> 2021-04-11  Sam Weinig  <weinig@apple.com>
> 
>         Simplify WebKitTestRunner preference reset to be more like DRT
>diff --git a/Source/WebCore/platform/graphics/ConcreteImageBuffer.h b/Source/WebCore/platform/graphics/ConcreteImageBuffer.h
>index 3a5114b7320b7c90d9204976ce402ff008ee57b0..d0f00ecc92a0e87ea8fb9172e489a796ad01b223 100644
>--- a/Source/WebCore/platform/graphics/ConcreteImageBuffer.h
>+++ b/Source/WebCore/platform/graphics/ConcreteImageBuffer.h
>@@ -1,5 +1,5 @@
> /*
>- * Copyright (C) 2020 Apple Inc.  All rights reserved.
>+ * Copyright (C) 2020-2021 Apple Inc.  All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -111,16 +111,12 @@ protected:
> 
>     size_t memoryCost() const override
>     {
>-        if (auto* backend = ensureBackendCreated())
>-            return m_backend->memoryCost();
>-        return 0;
>+        return BackendType::calculateMemoryCost(m_parameters);
>     }
> 
>     size_t externalMemoryCost() const override
>     {
>-        if (auto* backend = ensureBackendCreated())
>-            return m_backend->externalMemoryCost();
>-        return 0;
>+        return BackendType::calculateExternalMemoryCost(m_parameters);
>     }
> 
>     RefPtr<NativeImage> copyNativeImage(BackingStoreCopy copyBehavior = CopyBackingStore) const override
>diff --git a/Source/WebCore/platform/graphics/ImageBufferBackend.cpp b/Source/WebCore/platform/graphics/ImageBufferBackend.cpp
>index 3794de77be63a999a3b971c78bfdce1d4caa2b0b..2e66650f96af2738327ea9221e943646392b9a37 100644
>--- a/Source/WebCore/platform/graphics/ImageBufferBackend.cpp
>+++ b/Source/WebCore/platform/graphics/ImageBufferBackend.cpp
>@@ -1,5 +1,5 @@
> /*
>- * Copyright (C) 2020 Apple Inc.  All rights reserved.
>+ * Copyright (C) 2020-2021 Apple Inc.  All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -31,28 +31,25 @@
> 
> namespace WebCore {
> 
>-ImageBufferBackend::ImageBufferBackend(const Parameters& parameters)
>-    : m_parameters(parameters)
>+IntSize ImageBufferBackend::calculateBackendSize(const Parameters& parameters)
> {
>-}
>-
>-IntSize ImageBufferBackend::calculateBackendSize(const FloatSize& size, float resolutionScale)
>-{
>-    FloatSize scaledSize = { ceilf(resolutionScale * size.width()), ceilf(resolutionScale * size.height()) };
>+    FloatSize scaledSize = { ceilf(parameters.resolutionScale * parameters.logicalSize.width()), ceilf(parameters.resolutionScale * parameters.logicalSize.height()) };
>     if (scaledSize.isEmpty() || !scaledSize.isExpressibleAsIntSize())
>         return { };
> 
>-    IntSize backendSize = IntSize(scaledSize);
>-
>-    Checked<unsigned, RecordOverflow> bytesPerRow = 4 * Checked<unsigned, RecordOverflow>(backendSize.width());
>-    if (bytesPerRow.hasOverflowed())
>-        return { };
>+    return IntSize(scaledSize);
>+}
> 
>+size_t ImageBufferBackend::calculateMemoryCost(const IntSize& backendSize, unsigned bytesPerRow)
>+{
>+    ASSERT(!backendSize.isEmpty());
>     CheckedSize numBytes = Checked<unsigned, RecordOverflow>(backendSize.height()) * bytesPerRow;
>-    if (numBytes.hasOverflowed())
>-        return { };
>+    return numBytes.unsafeGet();
>+}
> 
>-    return backendSize;
>+ImageBufferBackend::ImageBufferBackend(const Parameters& parameters)
>+    : m_parameters(parameters)
>+{
> }
> 
> RefPtr<NativeImage> ImageBufferBackend::sinkIntoNativeImage()
>diff --git a/Source/WebCore/platform/graphics/ImageBufferBackend.h b/Source/WebCore/platform/graphics/ImageBufferBackend.h
>index 31ce97757b5d2f9800b15763ce16be1c7869f16c..dce4b7a1db911c13466038d13774a39fa93aab16 100644
>--- a/Source/WebCore/platform/graphics/ImageBufferBackend.h
>+++ b/Source/WebCore/platform/graphics/ImageBufferBackend.h
>@@ -1,5 +1,5 @@
> /*
>- * Copyright (C) 2020 Apple Inc.  All rights reserved.
>+ * Copyright (C) 2020-2021 Apple Inc.  All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -87,16 +87,15 @@ public:
> 
>     WEBCORE_EXPORT virtual ~ImageBufferBackend() = default;
> 
>-    WEBCORE_EXPORT static IntSize calculateBackendSize(const FloatSize&, float resolutionScale);
>+    WEBCORE_EXPORT static IntSize calculateBackendSize(const Parameters&);
>+    WEBCORE_EXPORT static size_t calculateMemoryCost(const IntSize& backendSize, unsigned bytesPerRow);
>+    static size_t calculateExternalMemoryCost(const Parameters&) { return 0; }
> 
>     virtual GraphicsContext& context() const = 0;
>     virtual void flushContext() { }
> 
>     virtual IntSize backendSize() const { return { }; }
> 
>-    virtual size_t memoryCost() const { return 4 * backendSize().area().unsafeGet(); }
>-    virtual size_t externalMemoryCost() const { return 0; }
>-
>     virtual RefPtr<NativeImage> copyNativeImage(BackingStoreCopy) const = 0;
>     virtual RefPtr<Image> copyImage(BackingStoreCopy, PreserveResolution) const = 0;
> 
>@@ -136,7 +135,7 @@ public:
> protected:
>     WEBCORE_EXPORT ImageBufferBackend(const Parameters&);
> 
>-    virtual unsigned bytesPerRow() const { return 4 * backendSize().width(); }
>+    virtual unsigned bytesPerRow() const = 0;
> 
>     template<typename T>
>     T toBackendCoordinates(T t) const
>diff --git a/Source/WebCore/platform/graphics/cairo/ImageBufferCairoImageSurfaceBackend.cpp b/Source/WebCore/platform/graphics/cairo/ImageBufferCairoImageSurfaceBackend.cpp
>index 47a45dcc2e82dd6d0cacb5126606abf7195c1041..17b7973ba14568eae98f4193cabaeb244c154da4 100644
>--- a/Source/WebCore/platform/graphics/cairo/ImageBufferCairoImageSurfaceBackend.cpp
>+++ b/Source/WebCore/platform/graphics/cairo/ImageBufferCairoImageSurfaceBackend.cpp
>@@ -3,7 +3,7 @@
>  * Copyright (C) 2007 Holger Hans Peter Freyther <zecke@selfish.org>
>  * Copyright (C) 2008, 2009 Dirk Schulze <krit@webkit.org>
>  * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
>- * Copyright (C) 2020 Apple Inc.  All rights reserved.
>+ * Copyright (C) 2020-2021 Apple Inc.  All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -41,14 +41,38 @@ namespace WebCore {
> 
> WTF_MAKE_ISO_ALLOCATED_IMPL(ImageBufferCairoImageSurfaceBackend);
> 
>+IntSize ImageBufferCairoImageSurfaceBackend::calculateSafeBackendSize(const Parameters& parameters)
>+{
>+    IntSize backendSize = calculateBackendSize(parameters);
>+    if (backendSize.isEmpty())
>+        return { };
>+
>+    if (backendSize.width() > cairoMaxImageSize || backendSize.height() > cairoMaxImageSize)
>+        return { };
>+
>+    return backendSize;
>+}
>+
>+unsigned ImageBufferCairoImageSurfaceBackend::calculateBytesPerRow(const IntSize& backendSize)
>+{
>+    ASSERT(!backendSize.isEmpty());
>+    return cairo_format_stride_for_width(CAIRO_FORMAT_ARGB32, backendSize.width());
>+}
>+
>+size_t ImageBufferCairoImageSurfaceBackend::calculateMemoryCost(const Parameters& parameters)
>+{
>+    IntSize backendSize = calculateBackendSize(parameters);
>+    return ImageBufferBackend::calculateMemoryCost(backendSize, calculateBytesPerRow(backendSize));
>+}
>+
> std::unique_ptr<ImageBufferCairoImageSurfaceBackend> ImageBufferCairoImageSurfaceBackend::create(const Parameters& parameters, const HostWindow*)
> {
>     ASSERT(parameters.pixelFormat == PixelFormat::BGRA8);
> 
>     static cairo_user_data_key_t s_surfaceDataKey;
> 
>-    IntSize backendSize = calculateBackendSize(parameters.logicalSize, parameters.resolutionScale);
>-    if (backendSize.isEmpty() || backendSize.width() > cairoMaxImageSize || backendSize.height() > cairoMaxImageSize)
>+    IntSize backendSize = calculateSafeBackendSize(parameters);
>+    if (backendSize.isEmpty())
>         return nullptr;
> 
>     int stride = cairo_format_stride_for_width(CAIRO_FORMAT_ARGB32, backendSize.width());
>@@ -77,6 +101,12 @@ ImageBufferCairoImageSurfaceBackend::ImageBufferCairoImageSurfaceBackend(const P
>     ASSERT(cairo_surface_get_type(m_surface.get()) == CAIRO_SURFACE_TYPE_IMAGE);
> }
> 
>+unsigned ImageBufferCairoImageSurfaceBackend::bytesPerRow() const
>+{
>+    IntSize backendSize = calculateBackendSize(m_parameters);
>+    return calculateBytesPerRow(backendSize);
>+}
>+
> void ImageBufferCairoImageSurfaceBackend::platformTransformColorSpace(const std::array<uint8_t, 256>& lookUpTable)
> {
>     unsigned char* dataSrc = cairo_image_surface_get_data(m_surface.get());
>diff --git a/Source/WebCore/platform/graphics/cairo/ImageBufferCairoImageSurfaceBackend.h b/Source/WebCore/platform/graphics/cairo/ImageBufferCairoImageSurfaceBackend.h
>index 865cc69b2d5338545f37e4193cb94f1980be73a4..bde99e34f60aa34634cb2b62807538feb64497f8 100644
>--- a/Source/WebCore/platform/graphics/cairo/ImageBufferCairoImageSurfaceBackend.h
>+++ b/Source/WebCore/platform/graphics/cairo/ImageBufferCairoImageSurfaceBackend.h
>@@ -3,7 +3,7 @@
>  * Copyright (C) 2007 Holger Hans Peter Freyther <zecke@selfish.org>
>  * Copyright (C) 2008, 2009 Dirk Schulze <krit@webkit.org>
>  * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
>- * Copyright (C) 2020 Apple Inc.  All rights reserved.
>+ * Copyright (C) 2020-2021 Apple Inc.  All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -40,12 +40,18 @@ class ImageBufferCairoImageSurfaceBackend : public ImageBufferCairoSurfaceBacken
>     WTF_MAKE_ISO_ALLOCATED(ImageBufferCairoImageSurfaceBackend);
>     WTF_MAKE_NONCOPYABLE(ImageBufferCairoImageSurfaceBackend);
> public:
>+    static IntSize calculateSafeBackendSize(const Parameters&);
>+    static unsigned calculateBytesPerRow(const IntSize& backendSize);
>+    static size_t calculateMemoryCost(const Parameters&);
>+
>     static std::unique_ptr<ImageBufferCairoImageSurfaceBackend> create(const Parameters&, const HostWindow*);
>     static std::unique_ptr<ImageBufferCairoImageSurfaceBackend> create(const Parameters&, const GraphicsContext&);
> 
> private:
>     ImageBufferCairoImageSurfaceBackend(const Parameters&, RefPtr<cairo_surface_t>&&);
> 
>+    unsigned bytesPerRow() const override;
>+
>     void platformTransformColorSpace(const std::array<uint8_t, 256>& lookUpTable) override;
> };
> 
>diff --git a/Source/WebCore/platform/graphics/cg/ImageBufferCGBackend.cpp b/Source/WebCore/platform/graphics/cg/ImageBufferCGBackend.cpp
>index c5c28421fdbc078d38dd4e8038c1f33e2af405f2..c4a3921f46d43d72914ef57b3a6728270cdc0060 100644
>--- a/Source/WebCore/platform/graphics/cg/ImageBufferCGBackend.cpp
>+++ b/Source/WebCore/platform/graphics/cg/ImageBufferCGBackend.cpp
>@@ -60,6 +60,13 @@ private:
>     RetainPtr<CGContextRef> m_context;
> };
> 
>+unsigned ImageBufferCGBackend::calculateBytesPerRow(const IntSize& backendSize)
>+{
>+    ASSERT(!backendSize.isEmpty());
>+    Checked<unsigned, RecordOverflow> bytesPerRow = (Checked<unsigned, RecordOverflow>(backendSize.width()) * 4);
>+    return bytesPerRow.unsafeGet();
>+}
>+
> RetainPtr<CGColorSpaceRef> ImageBufferCGBackend::contextColorSpace(const GraphicsContext& context)
> {
> #if PLATFORM(COCOA)
>diff --git a/Source/WebCore/platform/graphics/cg/ImageBufferCGBackend.h b/Source/WebCore/platform/graphics/cg/ImageBufferCGBackend.h
>index b26ae084347b9e233404600c2ea4a4a28b1e1ba7..54746860ded7e40a41423d9c6a0acee4d9c32863 100644
>--- a/Source/WebCore/platform/graphics/cg/ImageBufferCGBackend.h
>+++ b/Source/WebCore/platform/graphics/cg/ImageBufferCGBackend.h
>@@ -33,6 +33,8 @@ namespace WebCore {
> 
> class WEBCORE_EXPORT ImageBufferCGBackend : public ImageBufferBackend {
> public:
>+    static unsigned calculateBytesPerRow(const IntSize& backendSize);
>+
>     RefPtr<Image> copyImage(BackingStoreCopy = CopyBackingStore, PreserveResolution = PreserveResolution::No) const override;
>     RefPtr<Image> sinkIntoImage(PreserveResolution) override;
> 
>diff --git a/Source/WebCore/platform/graphics/cg/ImageBufferCGBitmapBackend.cpp b/Source/WebCore/platform/graphics/cg/ImageBufferCGBitmapBackend.cpp
>index 9d538befcd8e038f1a1a97a2a7784130f328ca45..1e4d824912324784a840def508bafb19c211eb9a 100644
>--- a/Source/WebCore/platform/graphics/cg/ImageBufferCGBitmapBackend.cpp
>+++ b/Source/WebCore/platform/graphics/cg/ImageBufferCGBitmapBackend.cpp
>@@ -1,5 +1,5 @@
> /*
>- * Copyright (C) 2020 Apple Inc.  All rights reserved.
>+ * Copyright (C) 2020-2021 Apple Inc.  All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -39,11 +39,34 @@ namespace WebCore {
> 
> WTF_MAKE_ISO_ALLOCATED_IMPL(ImageBufferCGBitmapBackend);
> 
>+IntSize ImageBufferCGBitmapBackend::calculateSafeBackendSize(const Parameters& parameters)
>+{
>+    IntSize backendSize = calculateBackendSize(parameters);
>+    if (backendSize.isEmpty())
>+        return backendSize;
>+    
>+    Checked<unsigned, RecordOverflow> bytesPerRow = 4 * Checked<unsigned, RecordOverflow>(backendSize.width());
>+    if (bytesPerRow.hasOverflowed())
>+        return { };
>+
>+    CheckedSize numBytes = Checked<unsigned, RecordOverflow>(backendSize.height()) * bytesPerRow;
>+    if (numBytes.hasOverflowed())
>+        return { };
>+
>+    return backendSize;
>+}
>+
>+size_t ImageBufferCGBitmapBackend::calculateMemoryCost(const Parameters& parameters)
>+{
>+    IntSize backendSize = calculateBackendSize(parameters);
>+    return ImageBufferBackend::calculateMemoryCost(backendSize, calculateBytesPerRow(backendSize));
>+}
>+
> std::unique_ptr<ImageBufferCGBitmapBackend> ImageBufferCGBitmapBackend::create(const Parameters& parameters, CGColorSpaceRef cgColorSpace, const HostWindow*)
> {
>     ASSERT(parameters.pixelFormat == PixelFormat::BGRA8);
> 
>-    IntSize backendSize = calculateBackendSize(parameters.logicalSize, parameters.resolutionScale);
>+    IntSize backendSize = calculateSafeBackendSize(parameters);
>     if (backendSize.isEmpty())
>         return nullptr;
> 
>@@ -109,6 +132,12 @@ IntSize ImageBufferCGBitmapBackend::backendSize() const
>     return { static_cast<int>(CGBitmapContextGetWidth(cgContext)), static_cast<int>(CGBitmapContextGetHeight(cgContext)) };
> }
> 
>+unsigned ImageBufferCGBitmapBackend::bytesPerRow() const
>+{
>+    IntSize backendSize = calculateBackendSize(m_parameters);
>+    return calculateBytesPerRow(backendSize);
>+}
>+
> RefPtr<NativeImage> ImageBufferCGBitmapBackend::copyNativeImage(BackingStoreCopy copyBehavior) const
> {
>     switch (copyBehavior) {
>diff --git a/Source/WebCore/platform/graphics/cg/ImageBufferCGBitmapBackend.h b/Source/WebCore/platform/graphics/cg/ImageBufferCGBitmapBackend.h
>index 8f3323e7dcec6355acb7d5b99c20787715c86ba8..790d342878fc037d45518fa29a6cd6eccd638a49 100644
>--- a/Source/WebCore/platform/graphics/cg/ImageBufferCGBitmapBackend.h
>+++ b/Source/WebCore/platform/graphics/cg/ImageBufferCGBitmapBackend.h
>@@ -36,6 +36,9 @@ class ImageBufferCGBitmapBackend : public ImageBufferCGBackend {
>     WTF_MAKE_ISO_ALLOCATED(ImageBufferCGBitmapBackend);
>     WTF_MAKE_NONCOPYABLE(ImageBufferCGBitmapBackend);
> public:
>+    static IntSize calculateSafeBackendSize(const Parameters&);
>+    static size_t calculateMemoryCost(const Parameters&);
>+
>     static std::unique_ptr<ImageBufferCGBitmapBackend> create(const Parameters&, CGColorSpaceRef, const HostWindow*);
>     static std::unique_ptr<ImageBufferCGBitmapBackend> create(const Parameters&, const HostWindow*);
>     static std::unique_ptr<ImageBufferCGBitmapBackend> create(const Parameters&, const GraphicsContext&);
>@@ -56,6 +59,8 @@ public:
> private:
>     ImageBufferCGBitmapBackend(const Parameters&, void* data, RetainPtr<CGDataProviderRef>&&, std::unique_ptr<GraphicsContext>&&);
> 
>+    unsigned bytesPerRow() const override;
>+
>     void* m_data;
>     RetainPtr<CGDataProviderRef> m_dataProvider;
>     std::unique_ptr<GraphicsContext> m_context;
>diff --git a/Source/WebCore/platform/graphics/cg/ImageBufferIOSurfaceBackend.cpp b/Source/WebCore/platform/graphics/cg/ImageBufferIOSurfaceBackend.cpp
>index 6c3b7c74b46e126e79d9f16220b3a2fad9edd9a1..8dfecb903168e72bf81bb80470aabb1b79c46877 100644
>--- a/Source/WebCore/platform/graphics/cg/ImageBufferIOSurfaceBackend.cpp
>+++ b/Source/WebCore/platform/graphics/cg/ImageBufferIOSurfaceBackend.cpp
>@@ -1,5 +1,5 @@
> /*
>- * Copyright (C) 2020 Apple Inc.  All rights reserved.
>+ * Copyright (C) 2020-2021 Apple Inc.  All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -41,9 +41,9 @@ namespace WebCore {
> 
> WTF_MAKE_ISO_ALLOCATED_IMPL(ImageBufferIOSurfaceBackend);
> 
>-IntSize ImageBufferIOSurfaceBackend::calculateBackendSize(const FloatSize& size, float resolutionScale)
>+IntSize ImageBufferIOSurfaceBackend::calculateSafeBackendSize(const Parameters& parameters)
> {
>-    IntSize backendSize = ImageBufferCGBackend::calculateBackendSize(size, resolutionScale);
>+    IntSize backendSize = calculateBackendSize(parameters);
>     if (backendSize.isEmpty())
>         return { };
> 
>@@ -54,6 +54,23 @@ IntSize ImageBufferIOSurfaceBackend::calculateBackendSize(const FloatSize& size,
>     return backendSize;
> }
> 
>+unsigned ImageBufferIOSurfaceBackend::calculateBytesPerRow(const IntSize& backendSize)
>+{
>+    unsigned bytesPerRow = ImageBufferCGBackend::calculateBytesPerRow(backendSize);
>+    return IOSurfaceAlignProperty(kIOSurfaceBytesPerRow, bytesPerRow);
>+}
>+
>+size_t ImageBufferIOSurfaceBackend::calculateMemoryCost(const Parameters& parameters)
>+{
>+    IntSize backendSize = calculateBackendSize(parameters);
>+    return ImageBufferBackend::calculateMemoryCost(backendSize, calculateBytesPerRow(backendSize));
>+}
>+
>+size_t ImageBufferIOSurfaceBackend::calculateExternalMemoryCost(const Parameters& parameters)
>+{
>+    return calculateMemoryCost(parameters);
>+}
>+
> RetainPtr<CGColorSpaceRef> ImageBufferIOSurfaceBackend::contextColorSpace(const GraphicsContext& context)
> {
>     CGContextRef cgContext = context.platformContext();
>@@ -66,7 +83,7 @@ RetainPtr<CGColorSpaceRef> ImageBufferIOSurfaceBackend::contextColorSpace(const
> 
> std::unique_ptr<ImageBufferIOSurfaceBackend> ImageBufferIOSurfaceBackend::create(const Parameters& parameters, CGColorSpaceRef cgColorSpace, const HostWindow* hostWindow)
> {
>-    IntSize backendSize = calculateBackendSize(parameters.logicalSize, parameters.resolutionScale);
>+    IntSize backendSize = calculateSafeBackendSize(parameters);
>     if (backendSize.isEmpty())
>         return nullptr;
> 
>@@ -106,7 +123,6 @@ ImageBufferIOSurfaceBackend::ImageBufferIOSurfaceBackend(const Parameters& param
> 
> GraphicsContext& ImageBufferIOSurfaceBackend::context() const
> {
>-
>     GraphicsContext& context = m_surface->ensureGraphicsContext();
>     if (m_needsSetupContext) {
>         m_needsSetupContext = false;
>@@ -125,16 +141,6 @@ IntSize ImageBufferIOSurfaceBackend::backendSize() const
>     return m_surface->size();
> }
> 
>-size_t ImageBufferIOSurfaceBackend::memoryCost() const
>-{
>-    return m_surface->totalBytes();
>-}
>-
>-size_t ImageBufferIOSurfaceBackend::externalMemoryCost() const
>-{
>-    return memoryCost();
>-}
>-
> unsigned ImageBufferIOSurfaceBackend::bytesPerRow() const
> {
>     return m_surface->bytesPerRow();
>diff --git a/Source/WebCore/platform/graphics/cg/ImageBufferIOSurfaceBackend.h b/Source/WebCore/platform/graphics/cg/ImageBufferIOSurfaceBackend.h
>index 4859df6fc525d85c328c145f079178356909e25d..b9d15690411c888f9e00a63986b5565a12893d3a 100644
>--- a/Source/WebCore/platform/graphics/cg/ImageBufferIOSurfaceBackend.h
>+++ b/Source/WebCore/platform/graphics/cg/ImageBufferIOSurfaceBackend.h
>@@ -1,5 +1,5 @@
> /*
>- * Copyright (C) 2020 Apple Inc.  All rights reserved.
>+ * Copyright (C) 2020-2021 Apple Inc.  All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -37,8 +37,11 @@ class WEBCORE_EXPORT ImageBufferIOSurfaceBackend : public ImageBufferCGBackend {
>     WTF_MAKE_ISO_ALLOCATED(ImageBufferIOSurfaceBackend);
>     WTF_MAKE_NONCOPYABLE(ImageBufferIOSurfaceBackend);
> public:
>-    static IntSize calculateBackendSize(const FloatSize& logicalSize, float resolutionScale);
>-
>+    static IntSize calculateSafeBackendSize(const Parameters&);
>+    static unsigned calculateBytesPerRow(const IntSize& backendSize);
>+    static size_t calculateMemoryCost(const Parameters&);
>+    static size_t calculateExternalMemoryCost(const Parameters&);
>+    
>     static std::unique_ptr<ImageBufferIOSurfaceBackend> create(const Parameters&, CGColorSpaceRef, const HostWindow*);
>     static std::unique_ptr<ImageBufferIOSurfaceBackend> create(const Parameters&, const HostWindow*);
>     static std::unique_ptr<ImageBufferIOSurfaceBackend> create(const Parameters&, const GraphicsContext&);
>@@ -50,9 +53,6 @@ public:
> 
>     IntSize backendSize() const override;
>     
>-    size_t memoryCost() const override;
>-    size_t externalMemoryCost() const override;
>-
>     RefPtr<NativeImage> copyNativeImage(BackingStoreCopy = CopyBackingStore) const override;
>     RefPtr<NativeImage> sinkIntoNativeImage() override;
> 
>diff --git a/Source/WebKit/Shared/ShareableBitmap.h b/Source/WebKit/Shared/ShareableBitmap.h
>index c7193bccb9feb061fb44cd295e6b3bd4b7e3bd91..45db88f6e44d895bfac178c593252d1a54abcf6e 100644
>--- a/Source/WebKit/Shared/ShareableBitmap.h
>+++ b/Source/WebKit/Shared/ShareableBitmap.h
>@@ -89,6 +89,10 @@ public:
>         Configuration m_configuration;
>     };
> 
>+    static Checked<unsigned, RecordOverflow> numBytesForSize(WebCore::IntSize, const ShareableBitmap::Configuration&);
>+    static Checked<unsigned, RecordOverflow> calculateBytesPerRow(WebCore::IntSize, const Configuration&);
>+    static Checked<unsigned, RecordOverflow> calculateBytesPerPixel(const Configuration&);
>+
>     // Create a shareable bitmap that uses malloced memory.
>     static RefPtr<ShareableBitmap> create(const WebCore::IntSize&, Configuration);
> 
>@@ -151,10 +155,6 @@ private:
>     ShareableBitmap(const WebCore::IntSize&, Configuration, void*);
>     ShareableBitmap(const WebCore::IntSize&, Configuration, RefPtr<SharedMemory>);
> 
>-    static Checked<unsigned, RecordOverflow> numBytesForSize(WebCore::IntSize, const ShareableBitmap::Configuration&);
>-    static Checked<unsigned, RecordOverflow> calculateBytesPerRow(WebCore::IntSize, const Configuration&);
>-    static Checked<unsigned, RecordOverflow> calculateBytesPerPixel(const Configuration&);
>-
> #if USE(CG)
>     RetainPtr<CGImageRef> createCGImage(CGDataProviderRef) const;
>     static void releaseBitmapContextData(void* typelessBitmap, void* typelessData);
>diff --git a/Source/WebKit/WebProcess/GPU/graphics/ImageBufferShareableBitmapBackend.cpp b/Source/WebKit/WebProcess/GPU/graphics/ImageBufferShareableBitmapBackend.cpp
>index e19a9abcc50a42c10626b30e9bdfed07e39e0a9b..162d03bd487e40c11e989b399ec28289f5919bd8 100644
>--- a/Source/WebKit/WebProcess/GPU/graphics/ImageBufferShareableBitmapBackend.cpp
>+++ b/Source/WebKit/WebProcess/GPU/graphics/ImageBufferShareableBitmapBackend.cpp
>@@ -1,5 +1,5 @@
> /*
>- * Copyright (C) 2020 Apple Inc. All rights reserved.
>+ * Copyright (C) 2020-2021 Apple Inc. All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -43,19 +43,54 @@ using namespace WebCore;
> 
> WTF_MAKE_ISO_ALLOCATED_IMPL(ImageBufferShareableBitmapBackend);
> 
>+ShareableBitmap::Configuration ImageBufferShareableBitmapBackend::configuration(const Parameters& parameters)
>+{
>+    ShareableBitmap::Configuration configuration;
>+#if PLATFORM(COCOA)
>+    configuration.colorSpace = { cachedCGColorSpace(parameters.colorSpace) };
>+#endif
>+    return configuration;
>+}
>+
>+IntSize ImageBufferShareableBitmapBackend::calculateSafeBackendSize(const Parameters& parameters)
>+{
>+    IntSize backendSize = calculateBackendSize(parameters);
>+    if (backendSize.isEmpty())
>+        return { };
>+
>+    Checked<unsigned, RecordOverflow> bytesPerRow = ShareableBitmap::calculateBytesPerRow(backendSize, configuration(parameters));
>+    if (bytesPerRow.hasOverflowed())
>+        return { };
>+
>+    CheckedSize numBytes = Checked<unsigned, RecordOverflow>(backendSize.height()) * bytesPerRow;
>+    if (numBytes.hasOverflowed())
>+        return { };
>+
>+    return backendSize;
>+}
>+
>+unsigned ImageBufferShareableBitmapBackend::calculateBytesPerRow(const Parameters& parameters, const IntSize& backendSize)
>+{
>+    ASSERT(!backendSize.isEmpty());
>+    Checked<unsigned, RecordOverflow> bytesPerRow = ShareableBitmap::calculateBytesPerRow(backendSize, configuration(parameters));
>+    return bytesPerRow.unsafeGet();
>+}
>+
>+size_t ImageBufferShareableBitmapBackend::calculateMemoryCost(const Parameters& parameters)
>+{
>+    IntSize backendSize = calculateBackendSize(parameters);
>+    return ImageBufferBackend::calculateMemoryCost(backendSize, calculateBytesPerRow(parameters, backendSize));
>+}
>+
> std::unique_ptr<ImageBufferShareableBitmapBackend> ImageBufferShareableBitmapBackend::create(const Parameters& parameters, const HostWindow*)
> {
>     ASSERT(parameters.pixelFormat == PixelFormat::BGRA8);
> 
>-    IntSize backendSize = calculateBackendSize(parameters.logicalSize, parameters.resolutionScale);
>+    IntSize backendSize = calculateSafeBackendSize(parameters);
>     if (backendSize.isEmpty())
>         return nullptr;
> 
>-    ShareableBitmap::Configuration configuration;
>-#if PLATFORM(COCOA)
>-    configuration.colorSpace = { cachedCGColorSpace(parameters.colorSpace) };
>-#endif
>-    auto bitmap = ShareableBitmap::createShareable(backendSize, configuration);
>+    auto bitmap = ShareableBitmap::createShareable(backendSize, configuration(parameters));
>     if (!bitmap)
>         return nullptr;
> 
>diff --git a/Source/WebKit/WebProcess/GPU/graphics/ImageBufferShareableBitmapBackend.h b/Source/WebKit/WebProcess/GPU/graphics/ImageBufferShareableBitmapBackend.h
>index 512c78e554b7c431ea7ab3b785e74bae3047f33e..5d1f4c99a452892eb511c67e0f9eca30a2d3c4f6 100644
>--- a/Source/WebKit/WebProcess/GPU/graphics/ImageBufferShareableBitmapBackend.h
>+++ b/Source/WebKit/WebProcess/GPU/graphics/ImageBufferShareableBitmapBackend.h
>@@ -1,5 +1,5 @@
> /*
>- * Copyright (C) 2020 Apple Inc.  All rights reserved.
>+ * Copyright (C) 2020-2021 Apple Inc.  All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -43,6 +43,11 @@ class ImageBufferShareableBitmapBackend : public WebCore::PlatformImageBufferBac
>     WTF_MAKE_ISO_ALLOCATED(ImageBufferShareableBitmapBackend);
>     WTF_MAKE_NONCOPYABLE(ImageBufferShareableBitmapBackend);
> public:
>+    static ShareableBitmap::Configuration configuration(const Parameters&);
>+    static WebCore::IntSize calculateSafeBackendSize(const Parameters&);
>+    static unsigned calculateBytesPerRow(const Parameters&, const WebCore::IntSize& backendSize);
>+    static size_t calculateMemoryCost(const Parameters&);
>+
>     static std::unique_ptr<ImageBufferShareableBitmapBackend> create(const Parameters&, const WebCore::HostWindow*);
>     static std::unique_ptr<ImageBufferShareableBitmapBackend> create(const Parameters&, ImageBufferBackendHandle);
> 
>diff --git a/Source/WebKit/WebProcess/GPU/graphics/RemoteImageBufferProxy.h b/Source/WebKit/WebProcess/GPU/graphics/RemoteImageBufferProxy.h
>index 2b6bff1047f117096718cde9dc71a4cf90bf5eef..8315ddc1aa67e43df36a97d846045e147532ab75 100644
>--- a/Source/WebKit/WebProcess/GPU/graphics/RemoteImageBufferProxy.h
>+++ b/Source/WebKit/WebProcess/GPU/graphics/RemoteImageBufferProxy.h
>@@ -55,10 +55,9 @@ class RemoteImageBufferProxy : public WebCore::DisplayList::ImageBuffer<BackendT
> public:
>     static RefPtr<RemoteImageBufferProxy> create(const WebCore::FloatSize& size, float resolutionScale, WebCore::DestinationColorSpace colorSpace, WebCore::PixelFormat pixelFormat, RemoteRenderingBackendProxy& remoteRenderingBackendProxy)
>     {
>-        if (BackendType::calculateBackendSize(size, resolutionScale).isEmpty())
>-            return nullptr;
>-
>         auto parameters = WebCore::ImageBufferBackend::Parameters { size, resolutionScale, colorSpace, pixelFormat };
>+        if (BackendType::calculateSafeBackendSize(parameters).isEmpty())
>+            return nullptr;
>         return adoptRef(new RemoteImageBufferProxy(parameters, remoteRenderingBackendProxy));
>     }
> 
>diff --git a/Source/WebKit/WebProcess/GPU/graphics/cocoa/ImageBufferShareableIOSurfaceBackend.cpp b/Source/WebKit/WebProcess/GPU/graphics/cocoa/ImageBufferShareableIOSurfaceBackend.cpp
>index 57c7f7d5a24597d2b6b2ff3eb50d7f56974950a9..7a0f891d62120edec2c5f7abd872ea6b65c84f99 100644
>--- a/Source/WebKit/WebProcess/GPU/graphics/cocoa/ImageBufferShareableIOSurfaceBackend.cpp
>+++ b/Source/WebKit/WebProcess/GPU/graphics/cocoa/ImageBufferShareableIOSurfaceBackend.cpp
>@@ -1,5 +1,5 @@
> /*
>- * Copyright (C) 2020 Apple Inc. All rights reserved.
>+ * Copyright (C) 2020-2021 Apple Inc. All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -29,6 +29,7 @@
> #if HAVE(IOSURFACE)
> 
> #include <WebCore/GraphicsContextCG.h>
>+#include <WebCore/ImageBufferIOSurfaceBackend.h>
> #include <wtf/IsoMallocInlines.h>
> #include <wtf/StdLibExtras.h>
> 
>@@ -37,6 +38,21 @@ using namespace WebCore;
> 
> WTF_MAKE_ISO_ALLOCATED_IMPL(ImageBufferShareableIOSurfaceBackend);
> 
>+IntSize ImageBufferShareableIOSurfaceBackend::calculateSafeBackendSize(const Parameters& parameters)
>+{
>+    return ImageBufferIOSurfaceBackend::calculateSafeBackendSize(parameters);
>+}
>+
>+size_t ImageBufferShareableIOSurfaceBackend::calculateMemoryCost(const Parameters& parameters)
>+{
>+    return ImageBufferIOSurfaceBackend::calculateMemoryCost(parameters);
>+}
>+
>+size_t ImageBufferShareableIOSurfaceBackend::calculateExternalMemoryCost(const Parameters& parameters)
>+{
>+    return ImageBufferIOSurfaceBackend::calculateExternalMemoryCost(parameters);
>+}
>+
> std::unique_ptr<ImageBufferShareableIOSurfaceBackend> ImageBufferShareableIOSurfaceBackend::create(const Parameters& parameters, ImageBufferBackendHandle handle)
> {
>     if (!WTF::holds_alternative<MachSendRight>(handle)) {
>@@ -58,6 +74,12 @@ GraphicsContext& ImageBufferShareableIOSurfaceBackend::context() const
>     return *(GraphicsContext*)nullptr;
> }
> 
>+unsigned ImageBufferShareableIOSurfaceBackend::bytesPerRow() const
>+{
>+    IntSize backendSize = calculateBackendSize(m_parameters);
>+    return ImageBufferIOSurfaceBackend::calculateBytesPerRow(backendSize);
>+}
>+
> RefPtr<NativeImage> ImageBufferShareableIOSurfaceBackend::copyNativeImage(BackingStoreCopy) const
> {
>     RELEASE_ASSERT_NOT_REACHED();
>diff --git a/Source/WebKit/WebProcess/GPU/graphics/cocoa/ImageBufferShareableIOSurfaceBackend.h b/Source/WebKit/WebProcess/GPU/graphics/cocoa/ImageBufferShareableIOSurfaceBackend.h
>index d5e00e42098a4b370682a497be389c0d38953ca8..1686254ee9acbc0a75f312b167537a2d2aa0dd32 100644
>--- a/Source/WebKit/WebProcess/GPU/graphics/cocoa/ImageBufferShareableIOSurfaceBackend.h
>+++ b/Source/WebKit/WebProcess/GPU/graphics/cocoa/ImageBufferShareableIOSurfaceBackend.h
>@@ -1,5 +1,5 @@
> /*
>- * Copyright (C) 2020 Apple Inc.  All rights reserved.
>+ * Copyright (C) 2020-2021 Apple Inc.  All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -38,6 +38,10 @@ class ImageBufferShareableIOSurfaceBackend final : public WebCore::ImageBufferBa
>     WTF_MAKE_ISO_ALLOCATED(ImageBufferShareableIOSurfaceBackend);
>     WTF_MAKE_NONCOPYABLE(ImageBufferShareableIOSurfaceBackend);
> public:
>+    static WebCore::IntSize calculateSafeBackendSize(const Parameters&);
>+    static size_t calculateMemoryCost(const Parameters&);
>+    static size_t calculateExternalMemoryCost(const Parameters&);
>+
>     static std::unique_ptr<ImageBufferShareableIOSurfaceBackend> create(const Parameters&, ImageBufferBackendHandle);
> 
>     ImageBufferShareableIOSurfaceBackend(const Parameters& parameters, ImageBufferBackendHandle&& handle)
>@@ -64,6 +68,8 @@ public:
>     static constexpr WebCore::RenderingMode renderingMode = WebCore::RenderingMode::Accelerated;
> 
> private:
>+    unsigned bytesPerRow() const override;
>+
>     ImageBufferBackendHandle m_handle;
> };
> 
>diff --git a/Source/WebKit/WebProcess/GPU/graphics/cocoa/ImageBufferShareableMappedIOSurfaceBackend.cpp b/Source/WebKit/WebProcess/GPU/graphics/cocoa/ImageBufferShareableMappedIOSurfaceBackend.cpp
>index 2e20eda773cbb73c3d0fb37b85a8133644766333..43beb51734a8a281e069e17fb739c0d22d68c1fb 100644
>--- a/Source/WebKit/WebProcess/GPU/graphics/cocoa/ImageBufferShareableMappedIOSurfaceBackend.cpp
>+++ b/Source/WebKit/WebProcess/GPU/graphics/cocoa/ImageBufferShareableMappedIOSurfaceBackend.cpp
>@@ -1,5 +1,5 @@
> /*
>- * Copyright (C) 2020 Apple Inc. All rights reserved.
>+ * Copyright (C) 2020-2021 Apple Inc. All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -41,7 +41,7 @@ WTF_MAKE_ISO_ALLOCATED_IMPL(ImageBufferShareableMappedIOSurfaceBackend);
> 
> std::unique_ptr<ImageBufferShareableMappedIOSurfaceBackend> ImageBufferShareableMappedIOSurfaceBackend::create(const Parameters& parameters, const HostWindow*)
> {
>-    IntSize backendSize = calculateBackendSize(parameters.logicalSize, parameters.resolutionScale);
>+    IntSize backendSize = calculateSafeBackendSize(parameters);
>     if (backendSize.isEmpty())
>         return nullptr;
>

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Attachments on bug 224306: 425450 | 425460 | 425465 | 425473 | 425476 | 425659 | 425715