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32 #ifndef HTMLSrcsetParser_h
33 #define HTMLSrcsetParser_h
35 #include "wtf/text/WTFString.h"
39 enum { UninitializedDescriptor = -1 };
41 class DescriptorParsingResult {
43 DescriptorParsingResult()
44 : m_density(UninitializedDescriptor)
45 , m_resourceWidth(UninitializedDescriptor)
46 , m_resourceHeight(UninitializedDescriptor)
50 bool hasDensity() const { return m_density >= 0; }
51 bool hasWidth() const { return m_resourceWidth >= 0; }
52 bool hasHeight() const { return m_resourceHeight >= 0; }
54 float density() const { ASSERT(hasDensity()); return m_density; }
55 unsigned resourceWidth() const { ASSERT(hasWidth()); return m_resourceWidth; }
56 unsigned resourceHeight() const { ASSERT(hasHeight()); return m_resourceHeight; }
58 void setResourceWidth(int width) { ASSERT(width >= 0); m_resourceWidth = (unsigned)width; }
59 void setResourceHeight(int height) { ASSERT(height >= 0); m_resourceHeight = (unsigned)height; }
60 void setDensity(float densityToSet) { ASSERT(densityToSet >= 0); m_density = densityToSet; }
68 class ImageCandidate {
70 enum OriginAttribute {
77 , m_resourceWidth(UninitializedDescriptor)
78 , m_originAttribute(SrcsetOrigin)
82 ImageCandidate(const String& source, unsigned start, unsigned length, const DescriptorParsingResult& result, OriginAttribute originAttribute)
83 : m_string(source.createView(start, length))
84 , m_density(result.hasDensity()?result.density():UninitializedDescriptor)
85 , m_resourceWidth(result.hasWidth()?result.resourceWidth():UninitializedDescriptor)
86 , m_originAttribute(originAttribute)
90 String toString() const
92 return String(m_string.toString());
95 AtomicString url() const
97 return AtomicString(m_string.toString());
100 void setDensity(float factor)
105 float density() const
110 int resourceWidth() const
112 return m_resourceWidth;
115 bool srcOrigin() const
117 return (m_originAttribute == SrcOrigin);
120 inline bool isEmpty() const
122 return m_string.isEmpty();
129 OriginAttribute m_originAttribute;
132 ImageCandidate bestFitSourceForSrcsetAttribute(float deviceScaleFactor, unsigned sourceSize, const String& srcsetAttribute);
134 ImageCandidate bestFitSourceForImageAttributes(float deviceScaleFactor, unsigned sourceSize, const String& srcAttribute, const String& srcsetAttribute);
136 String bestFitSourceForImageAttributes(float deviceScaleFactor, unsigned sourceSize, const String& srcAttribute, ImageCandidate& srcsetImageCandidate);