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32 #ifndef HTMLSrcsetParser_h
33 #define HTMLSrcsetParser_h
35 #include "wtf/text/WTFString.h"
41 enum { UninitializedDescriptor = -1 };
43 class DescriptorParsingResult {
45 DescriptorParsingResult()
46 : m_density(UninitializedDescriptor)
47 , m_resourceWidth(UninitializedDescriptor)
48 , m_resourceHeight(UninitializedDescriptor)
52 bool hasDensity() const { return m_density >= 0; }
53 bool hasWidth() const { return m_resourceWidth >= 0; }
54 bool hasHeight() const { return m_resourceHeight >= 0; }
56 float density() const { ASSERT(hasDensity()); return m_density; }
57 unsigned resourceWidth() const { ASSERT(hasWidth()); return m_resourceWidth; }
58 unsigned resourceHeight() const { ASSERT(hasHeight()); return m_resourceHeight; }
60 void setResourceWidth(int width) { ASSERT(width >= 0); m_resourceWidth = (unsigned)width; }
61 void setResourceHeight(int height) { ASSERT(height >= 0); m_resourceHeight = (unsigned)height; }
62 void setDensity(float densityToSet) { ASSERT(densityToSet >= 0); m_density = densityToSet; }
70 class ImageCandidate {
72 enum OriginAttribute {
79 , m_resourceWidth(UninitializedDescriptor)
80 , m_originAttribute(SrcsetOrigin)
84 ImageCandidate(const String& source, unsigned start, unsigned length, const DescriptorParsingResult& result, OriginAttribute originAttribute)
85 : m_string(source.createView(start, length))
86 , m_density(result.hasDensity()?result.density():UninitializedDescriptor)
87 , m_resourceWidth(result.hasWidth()?result.resourceWidth():UninitializedDescriptor)
88 , m_originAttribute(originAttribute)
92 String toString() const
94 return String(m_string.toString());
97 AtomicString url() const
99 return AtomicString(m_string.toString());
102 void setDensity(float factor)
107 float density() const
112 int resourceWidth() const
114 return m_resourceWidth;
117 bool srcOrigin() const
119 return (m_originAttribute == SrcOrigin);
122 inline bool isEmpty() const
124 return m_string.isEmpty();
131 OriginAttribute m_originAttribute;
134 ImageCandidate bestFitSourceForSrcsetAttribute(float deviceScaleFactor, float sourceSize, const String& srcsetAttribute, Document* = nullptr);
136 ImageCandidate bestFitSourceForImageAttributes(float deviceScaleFactor, float sourceSize, const String& srcAttribute, const String& srcsetAttribute, Document* = nullptr);
138 String bestFitSourceForImageAttributes(float deviceScaleFactor, float sourceSize, const String& srcAttribute, ImageCandidate& srcsetImageCandidate);