https://bugs.webkit.org/show_bug.cgi?id=125676

Reviewed by Simon Fraser.

* css/CSSCrossfadeValue.cpp:
(WebCore::subimageKnownToBeOpaque): Take a reference to the CSSValue, since
it's known not to be null. Used checked cast.
(WebCore::CSSCrossfadeValue::knownToBeOpaque): Updated to pass a reference.

* css/CSSImageGeneratorValue.cpp:
(WebCore::CSSImageGeneratorValue::saveCachedImageForSize): Use
make_unique instead of adoptPtr.
(WebCore::CSSImageGeneratorValue::subimageIsPending): Use checked cast.
(WebCore::CSSImageGeneratorValue::cachedImageForCSSValue): Ditto, also
use nullptr.

* css/CSSImageGeneratorValue.h: Removed unneeded includes, added some forward
declarations, used unique_ptr instead of OwnPtr, and used CSS_VALUE_TYPE_CASTS
macro to create cast functions.

* css/CSSValue.cpp: Removed unneeded include of CSSImageGeneratorValue.h.

* css/StyleResolver.cpp:
(WebCore::StyleResolver::State::clear): Use nullptr instead of 0.
(WebCore::StyleResolver::applyProperty): Use checked cast and pass references
instead of pointers to StyleGeneratedImage::create.
(WebCore::StyleResolver::styleImage): Use checked cast and pass references
instead of pointers to generatedOrPendingFromValue.
(WebCore::StyleResolver::generatedOrPendingFromValue): Take the value as a
reference instead of a pointer.
(WebCore::StyleResolver::loadPendingImage): Pass a refernece instead of a
pointer to StyleGeneratedImage::create.
(WebCore::StyleResolver::loadPendingImages): Use auto for iteration instead of
a lot type name.

* css/StyleResolver.h: Changed generatedOrPendingFromValue to take the value
as a reference instead of a pointer.

* page/animation/CSSPropertyAnimation.cpp:
(WebCore::blendFilter): Pass a reference insted of a pointer to
StyleGeneratedImage::create.
(WebCore::crossfadeBlend): Ditto.
(WebCore::blendFunc): Ditto. Also use references for local variables.

* rendering/style/StyleGeneratedImage.cpp:
(WebCore::StyleGeneratedImage::StyleGeneratedImage): Use PassRef instead of
PassRefPtr for the argument type.
(WebCore::StyleGeneratedImage::cssValue): Updated since m_imageGeneratorValue
is now a Ref instead of a RefPtr. Sadly this requires a const_cast that we can
come back and get rid of later.
(WebCore::StyleGeneratedImage::imageSize): Ditto.
(WebCore::StyleGeneratedImage::image): Ditto.

* rendering/style/StyleGeneratedImage.h: Changed create function and constructor
to take a PassRef. Made imageValue non-const since it returns a non-const value,
to be consistent with "conceptual const". Changed m_imageGeneratorValue to be a
Ref instead of a RefPtr.

* rendering/style/StyleImage.h: Made WrappedImagePtr be const void*, since it's
a pointer used only for equality checks. Not a great idiom, but fine to use a
const pointer instead of non-const, and avoids the const_cast we'd otherwise
need in StyleGeneratedImage::data.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@160528 268f45cc-cd09-0410-ab3c-d52691b4dbfc