CSSCrossfadeValue.h [plain text]
#ifndef CSSCrossfadeValue_h
#define CSSCrossfadeValue_h
#include "CachedImageClient.h"
#include "CachedResourceHandle.h"
#include "CSSImageGeneratorValue.h"
#include "CSSPrimitiveValue.h"
#include "Image.h"
#include "ImageObserver.h"
namespace WebCore {
class CachedImage;
class CrossfadeSubimageObserverProxy;
class RenderElement;
class Document;
class CSSCrossfadeValue : public CSSImageGeneratorValue {
friend class CrossfadeSubimageObserverProxy;
public:
static Ref<CSSCrossfadeValue> create(PassRefPtr<CSSValue> fromValue, PassRefPtr<CSSValue> toValue)
{
return adoptRef(*new CSSCrossfadeValue(fromValue, toValue));
}
~CSSCrossfadeValue();
String customCSSText() const;
PassRefPtr<Image> image(RenderElement*, const FloatSize&);
bool isFixedSize() const { return true; }
FloatSize fixedSize(const RenderElement*);
bool isPending() const;
bool knownToBeOpaque(const RenderElement*) const;
void loadSubimages(CachedResourceLoader&, const ResourceLoaderOptions&);
void setPercentage(PassRefPtr<CSSPrimitiveValue> percentageValue) { m_percentageValue = percentageValue; }
bool traverseSubresources(const std::function<bool (const CachedResource&)>& handler) const;
PassRefPtr<CSSCrossfadeValue> blend(const CSSCrossfadeValue&, double) const;
bool equals(const CSSCrossfadeValue&) const;
bool equalInputImages(const CSSCrossfadeValue&) const;
private:
CSSCrossfadeValue(PassRefPtr<CSSValue> fromValue, PassRefPtr<CSSValue> toValue)
: CSSImageGeneratorValue(CrossfadeClass)
, m_fromValue(fromValue)
, m_toValue(toValue)
, m_crossfadeSubimageObserver(this)
{
}
class CrossfadeSubimageObserverProxy final : public CachedImageClient {
public:
CrossfadeSubimageObserverProxy(CSSCrossfadeValue* ownerValue)
: m_ownerValue(ownerValue)
, m_ready(false)
{
}
virtual ~CrossfadeSubimageObserverProxy() { }
virtual void imageChanged(CachedImage*, const IntRect* = nullptr) override;
void setReady(bool ready) { m_ready = ready; }
private:
CSSCrossfadeValue* m_ownerValue;
bool m_ready;
};
void crossfadeChanged(const IntRect&);
RefPtr<CSSValue> m_fromValue;
RefPtr<CSSValue> m_toValue;
RefPtr<CSSPrimitiveValue> m_percentageValue;
CachedResourceHandle<CachedImage> m_cachedFromImage;
CachedResourceHandle<CachedImage> m_cachedToImage;
RefPtr<Image> m_generatedImage;
CrossfadeSubimageObserverProxy m_crossfadeSubimageObserver;
};
}
SPECIALIZE_TYPE_TRAITS_CSS_VALUE(CSSCrossfadeValue, isCrossfadeValue())
#endif // CSSCrossfadeValue_h