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/*
* 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.
*/
#ifndef HTMLSrcsetParser_h
#define HTMLSrcsetParser_h
#include "core/CoreExport.h"
#include "wtf/Allocator.h"
#include "wtf/text/StringView.h"
#include "wtf/text/WTFString.h"
namespace blink {
class Document;
enum { UninitializedDescriptor = -1 };
class DescriptorParsingResult {
STACK_ALLOCATED();
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 getResourceWidth() 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;
};
class ImageCandidate {
DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
public:
enum OriginAttribute {
SrcsetOrigin,
SrcOrigin
};
ImageCandidate()
: m_density(1.0)
, m_resourceWidth(UninitializedDescriptor)
, m_originAttribute(SrcsetOrigin)
{
}
ImageCandidate(const String& source, unsigned start, unsigned length, const DescriptorParsingResult& result, OriginAttribute originAttribute)
: m_source(source)
, m_string(source, start, length)
, m_density(result.hasDensity() ? result.density() : UninitializedDescriptor)
, m_resourceWidth(result.hasWidth() ? result.getResourceWidth() : UninitializedDescriptor)
, m_originAttribute(originAttribute)
{
}
String toString() const
{
return m_string.toString();
}
AtomicString url() const
{
return AtomicString(toString());
}
void setDensity(float factor)
{
m_density = factor;
}
float density() const
{
return m_density;
}
int getResourceWidth() const
{
return m_resourceWidth;
}
bool srcOrigin() const
{
return (m_originAttribute == SrcOrigin);
}
inline bool isEmpty() const
{
return m_string.isEmpty();
}
private:
String m_source; // Keep the StringView buffer alive.
StringView m_string;
float m_density;
int m_resourceWidth;
OriginAttribute m_originAttribute;
};
ImageCandidate bestFitSourceForSrcsetAttribute(float deviceScaleFactor, float sourceSize, const String& srcsetAttribute, Document* = nullptr);
CORE_EXPORT ImageCandidate bestFitSourceForImageAttributes(float deviceScaleFactor, float sourceSize, const String& srcAttribute, const String& srcsetAttribute, Document* = nullptr);
String bestFitSourceForImageAttributes(float deviceScaleFactor, float sourceSize, const String& srcAttribute, ImageCandidate& srcsetImageCandidate);
} // namespace blink
#endif