1 files changed, 109 insertions, 0 deletions
diff --git a/Source/WebCore/html/parser/HTMLSrcsetParser.h b/Source/WebCore/html/parser/HTMLSrcsetParser.h
new file mode 100644
index 000000000..63aee53a3
--- /dev/null
+++ b/Source/WebCore/html/parser/HTMLSrcsetParser.h
@@ -0,0 +1,109 @@
+/*
+ * Copyright (C) 2013 Apple Inc. All rights reserved.
+ * Copyright (C) 2013 Google 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:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * 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.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "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 THE COPYRIGHT
+ * OWNER 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.
+ */
+
+#pragma once
+
+#include <wtf/text/StringView.h>
+
+namespace WebCore {
+
+const int UninitializedDescriptor = -1;
+const float DefaultDensityValue = 1.0;
+
+class DescriptorParsingResult {
+public:
+    DescriptorParsingResult()
+        : m_density(UninitializedDescriptor)
+        , m_resourceWidth(UninitializedDescriptor)
+        , m_resourceHeight(UninitializedDescriptor)
+    {
+    }
+
+    bool hasDensity() const { return m_density >= 0; }
+    bool hasWidth() const { return m_resourceWidth >= 0; }
+    bool hasHeight() const { return m_resourceHeight >= 0; }
+
+    float density() const { ASSERT(hasDensity()); return m_density; }
+    unsigned resourceWidth() const { ASSERT(hasWidth()); return m_resourceWidth; }
+    unsigned resourceHeight() const { ASSERT(hasHeight()); return m_resourceHeight; }
+
+    void setResourceWidth(int width) { ASSERT(width >= 0); m_resourceWidth = (unsigned)width; }
+    void setResourceHeight(int height) { ASSERT(height >= 0); m_resourceHeight = (unsigned)height; }
+    void setDensity(float densityToSet) { ASSERT(densityToSet >= 0); m_density = densityToSet; }
+
+private:
+    float m_density;
+    int m_resourceWidth;
+    int m_resourceHeight;
+};
+
+struct ImageCandidate {
+    enum OriginAttribute {
+        SrcsetOrigin,
+        SrcOrigin
+    };
+
+    ImageCandidate()
+        : density(DefaultDensityValue)
+        , resourceWidth(UninitializedDescriptor)
+        , originAttribute(SrcsetOrigin)
+    {
+    }
+
+    ImageCandidate(const StringView& source, const DescriptorParsingResult& result, OriginAttribute originAttribute)
+        : string(source)
+        , density(result.hasDensity() ? result.density() : UninitializedDescriptor)
+        , resourceWidth(result.hasWidth() ? result.resourceWidth() : UninitializedDescriptor)
+        , originAttribute(originAttribute)
+    {
+    }
+
+    bool srcOrigin() const
+    {
+        return (originAttribute == SrcOrigin);
+    }
+    
+    bool isEmpty() const
+    {
+        return string.isEmpty();
+    }
+
+    StringView string;
+    float density;
+    int resourceWidth;
+    OriginAttribute originAttribute;
+};
+
+ImageCandidate bestFitSourceForImageAttributes(float deviceScaleFactor, const AtomicString& srcAttribute, const AtomicString& srcsetAttribute, float sourceSize);
+
+Vector<ImageCandidate> parseImageCandidatesFromSrcsetAttribute(StringView attribute);
+
+} // namespace WebCore