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/*
* 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 CSSToLengthConversionData_h
#define CSSToLengthConversionData_h
#include <limits>
#include "core/CoreExport.h"
#include "core/css/CSSPrimitiveValue.h"
#include "platform/geometry/DoubleSize.h"
#include "platform/wtf/Allocator.h"
#include "platform/wtf/Assertions.h"
#include "platform/wtf/MathExtras.h"
namespace blink {
class ComputedStyle;
class LayoutView;
class Font;
class CORE_EXPORT CSSToLengthConversionData {
DISALLOW_NEW();
public:
class CORE_EXPORT FontSizes {
DISALLOW_NEW();
public:
FontSizes() : em_(0), rem_(0), font_(nullptr) {}
FontSizes(float em, float rem, const Font*);
FontSizes(const ComputedStyle*, const ComputedStyle* root_style);
float Em() const { return em_; }
float Rem() const { return rem_; }
float Ex() const;
float Ch() const;
private:
float em_;
float rem_;
const Font* font_;
};
class CORE_EXPORT ViewportSize {
DISALLOW_NEW();
public:
ViewportSize() = default;
ViewportSize(double width, double height) : size_(width, height) {}
explicit ViewportSize(const LayoutView*);
double Width() const { return size_.Width(); }
double Height() const { return size_.Height(); }
private:
DoubleSize size_;
};
CSSToLengthConversionData() : style_(nullptr), zoom_(1) {}
CSSToLengthConversionData(const ComputedStyle*,
const FontSizes&,
const ViewportSize&,
float zoom);
CSSToLengthConversionData(const ComputedStyle* curr_style,
const ComputedStyle* root_style,
const LayoutView*,
float zoom);
float Zoom() const { return zoom_; }
float EmFontSize() const { return font_sizes_.Em(); }
float RemFontSize() const;
float ExFontSize() const { return font_sizes_.Ex(); }
float ChFontSize() const { return font_sizes_.Ch(); }
// Accessing these marks the style as having viewport units
double ViewportWidthPercent() const;
double ViewportHeightPercent() const;
double ViewportMinPercent() const;
double ViewportMaxPercent() const;
void SetFontSizes(const FontSizes& font_sizes) { font_sizes_ = font_sizes; }
void SetZoom(float zoom) {
DCHECK(std::isfinite(zoom));
DCHECK_GT(zoom, 0);
zoom_ = zoom;
}
CSSToLengthConversionData CopyWithAdjustedZoom(float new_zoom) const {
return CSSToLengthConversionData(style_, font_sizes_, viewport_size_,
new_zoom);
}
double ZoomedComputedPixels(double value, CSSPrimitiveValue::UnitType) const;
private:
const ComputedStyle* style_;
FontSizes font_sizes_;
ViewportSize viewport_size_;
float zoom_;
};
} // namespace blink
#endif