Can't load a very large image as an image document

https://bugs.webkit.org/show_bug.cgi?id=241110
<rdar://94126683>

Reviewed by Jer Noble.

Stop flattening the SharedBuffer whenever we received a new segment.
The core logic change to support this was done in https://bugs.webkit.org/show_bug.cgi?id=236695
but the CachedImage wasn't modified at the time (it should have been).

We have to use const_cast for now to minimize the change size, proper solution will be done in
https://bugs.webkit.org/show_bug.cgi?id=241251

* Source/WebCore/loader/cache/CachedImage.cpp:
(WebCore::CachedImage::updateBufferInternal):
(WebCore::CachedImage::updateBuffer):
* Source/WebCore/loader/cache/CachedImage.h:

Canonical link: https://commits.webkit.org/251253@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@295169 268f45cc-cd09-0410-ab3c-d52691b4dbfc

Source/WebCore/loader/cache/CachedImage.cpp

@@ -471,9 +471,9 @@ inline void CachedImage::clearImage()
     m_updateImageDataCount = 0;
 }
 
-void CachedImage::updateBufferInternal(const SharedBuffer& data)
+void CachedImage::updateBufferInternal(const FragmentedSharedBuffer& data)
 {
-    m_data = data.makeContiguous();
+    m_data = const_cast<FragmentedSharedBuffer*>(&data);
     setEncodedSize(m_data->size());
     createImage();
 
@@ -553,7 +553,7 @@ EncodedDataStatus CachedImage::updateImageData(bool allDataReceived)
 void CachedImage::updateBuffer(const FragmentedSharedBuffer& buffer)
 {
     ASSERT(dataBufferingPolicy() == DataBufferingPolicy::BufferData);
-    updateBufferInternal(buffer.makeContiguous());
+    updateBufferInternal(buffer);
 }
 
 void CachedImage::updateData(const SharedBuffer& data)

Source/WebCore/loader/cache/CachedImage.h

@@ -169,7 +169,7 @@ class CachedImage final : public CachedResource {
     void changedInRect(const Image&, const IntRect*);
     void scheduleRenderingUpdate(const Image&);
 
-    void updateBufferInternal(const SharedBuffer&);
+    void updateBufferInternal(const FragmentedSharedBuffer&);
 
     void didReplaceSharedBufferContents() override;