Imported WebKit commit 2ea9d364d0f6efa8fa64acf19f451504c59be0e4 (http://svn.webkit.org/repository/webkit/trunk@104285)

1 files changed, 175 insertions, 0 deletions

diff --git a/Source/WebCore/css/CSSCrossfadeValue.cpp b/Source/WebCore/css/CSSCrossfadeValue.cpp
new file mode 100644
index 000000000..4ff08afca
--- /dev/null
+++ b/Source/WebCore/css/CSSCrossfadeValue.cpp
@@ -0,0 +1,175 @@
+/*
+ * Copyright (C) 2011 Apple Inc.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "CSSCrossfadeValue.h"
+
+#include "CSSImageValue.h"
+#include "CachedImage.h"
+#include "CachedResourceLoader.h"
+#include "CrossfadeGeneratedImage.h"
+#include "ImageBuffer.h"
+#include "RenderObject.h"
+#include "StyleCachedImage.h"
+#include "StyleGeneratedImage.h"
+
+namespace WebCore {
+
+static bool subimageIsPending(CSSValue* value)
+{
+    if (value->isImageValue())
+        return static_cast<CSSImageValue*>(value)->cachedOrPendingImage()->isPendingImage();
+    
+    if (value->isImageGeneratorValue())
+        return static_cast<CSSImageGeneratorValue*>(value)->isPending();
+    
+    ASSERT_NOT_REACHED();
+    
+    return false;
+}
+
+static CachedImage* cachedImageForCSSValue(CSSValue* value, CachedResourceLoader* cachedResourceLoader)
+{
+    if (!value)
+        return 0;
+
+    if (value->isImageValue()) {
+        StyleCachedImage* styleCachedImage = static_cast<CSSImageValue*>(value)->cachedImage(cachedResourceLoader);
+        if (!styleCachedImage)
+            return 0;
+
+        return styleCachedImage->cachedImage();
+    }
+    
+    if (value->isImageGeneratorValue()) {
+        static_cast<CSSImageGeneratorValue*>(value)->loadSubimages(cachedResourceLoader);
+        // FIXME: Handle CSSImageGeneratorValue (and thus cross-fades with gradients and canvas).
+        return 0;
+    }
+    
+    ASSERT_NOT_REACHED();
+    
+    return 0;
+}
+
+CSSCrossfadeValue::~CSSCrossfadeValue()
+{
+    if (m_cachedFromImage)
+        m_cachedFromImage->removeClient(&m_crossfadeSubimageObserver);
+    if (m_cachedToImage)
+        m_cachedToImage->removeClient(&m_crossfadeSubimageObserver);
+}
+
+String CSSCrossfadeValue::customCssText() const
+{
+    String result = "-webkit-cross-fade(";
+    result += m_fromValue->cssText() + ", ";
+    result += m_toValue->cssText() + ", ";
+    result += m_percentageValue->cssText();
+    result += ")";
+    return result;
+}
+
+IntSize CSSCrossfadeValue::fixedSize(const RenderObject* renderer)
+{
+    float percentage = m_percentageValue->getFloatValue();
+    float inversePercentage = 1 - percentage;
+
+    CachedResourceLoader* cachedResourceLoader = renderer->document()->cachedResourceLoader();
+    CachedImage* cachedFromImage = cachedImageForCSSValue(m_fromValue.get(), cachedResourceLoader);
+    CachedImage* cachedToImage = cachedImageForCSSValue(m_toValue.get(), cachedResourceLoader);
+
+    if (!cachedFromImage || !cachedToImage)
+        return IntSize();
+
+    IntSize fromImageSize = cachedFromImage->imageForRenderer(renderer)->size();
+    IntSize toImageSize = cachedToImage->imageForRenderer(renderer)->size();
+
+    // Rounding issues can cause transitions between images of equal size to return
+    // a different fixed size; avoid performing the interpolation if the images are the same size.
+    if (fromImageSize == toImageSize)
+        return fromImageSize;
+
+    return IntSize(fromImageSize.width() * inversePercentage + toImageSize.width() * percentage,
+        fromImageSize.height() * inversePercentage + toImageSize.height() * percentage);
+}
+
+bool CSSCrossfadeValue::isPending() const
+{
+    return subimageIsPending(m_fromValue.get()) || subimageIsPending(m_toValue.get());
+}
+
+void CSSCrossfadeValue::loadSubimages(CachedResourceLoader* cachedResourceLoader)
+{
+    m_cachedFromImage = cachedImageForCSSValue(m_fromValue.get(), cachedResourceLoader);
+    m_cachedToImage = cachedImageForCSSValue(m_toValue.get(), cachedResourceLoader);
+
+    if (m_cachedFromImage)
+        m_cachedFromImage->addClient(&m_crossfadeSubimageObserver);
+    if (m_cachedToImage)
+        m_cachedToImage->addClient(&m_crossfadeSubimageObserver);
+
+    m_crossfadeSubimageObserver.setReady(true);
+}
+
+PassRefPtr<Image> CSSCrossfadeValue::image(RenderObject* renderer, const IntSize& size)
+{
+    if (size.isEmpty())
+        return 0;
+
+    CachedResourceLoader* cachedResourceLoader = renderer->document()->cachedResourceLoader();
+    CachedImage* cachedFromImage = cachedImageForCSSValue(m_fromValue.get(), cachedResourceLoader);
+    CachedImage* cachedToImage = cachedImageForCSSValue(m_toValue.get(), cachedResourceLoader);
+
+    if (!cachedFromImage || !cachedToImage)
+        return Image::nullImage();
+
+    Image* fromImage = cachedFromImage->imageForRenderer(renderer);
+    Image* toImage = cachedToImage->imageForRenderer(renderer);
+
+    if (!fromImage || !toImage)
+        return Image::nullImage();
+
+    m_generatedImage = CrossfadeGeneratedImage::create(fromImage, toImage, m_percentageValue->getFloatValue(), fixedSize(renderer), size);
+
+    return m_generatedImage.release();
+}
+
+void CSSCrossfadeValue::crossfadeChanged(const IntRect&)
+{
+    RenderObjectSizeCountMap::const_iterator end = clients().end();
+    for (RenderObjectSizeCountMap::const_iterator curr = clients().begin(); curr != end; ++curr) {
+        RenderObject* client = const_cast<RenderObject*>(curr->first);
+        client->imageChanged(static_cast<WrappedImagePtr>(this));
+    }
+}
+
+void CSSCrossfadeValue::CrossfadeSubimageObserverProxy::imageChanged(CachedImage*, const IntRect* rect)
+{
+    if (m_ready)
+        m_ownerValue->crossfadeChanged(*rect);
+}
+
+} // namespace WebCore