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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.
*/
#include "config.h"
#include "core/css/CSSToLengthConversionData.h"
#include "core/rendering/RenderView.h"
#include "core/rendering/style/RenderStyle.h"
namespace blink {
CSSToLengthConversionData::FontSizes::FontSizes(float em, float rem, const Font* font)
: m_em(em)
, m_rem(rem)
, m_font(font)
{
// FIXME: Improve RAII of StyleResolverState to use const Font&.
ASSERT(m_font);
}
CSSToLengthConversionData::FontSizes::FontSizes(const RenderStyle* style, const RenderStyle* rootStyle)
: FontSizes(style->computedFontSize(), rootStyle ? rootStyle->computedFontSize() : 1.0f, &style->font())
{
}
float CSSToLengthConversionData::FontSizes::ex() const
{
ASSERT(m_font);
// FIXME: We have a bug right now where the zoom will be applied twice to EX units.
// We really need to compute EX using fontMetrics for the original specifiedSize and not use
// our actual constructed rendering font.
if (!m_font->fontMetrics().hasXHeight())
return m_em / 2.0f;
return m_font->fontMetrics().xHeight();
}
float CSSToLengthConversionData::FontSizes::ch() const
{
ASSERT(m_font);
return m_font->fontMetrics().zeroWidth();
}
CSSToLengthConversionData::ViewportSize::ViewportSize(const RenderView* renderView)
: m_width(renderView ? renderView->layoutViewportWidth() : 0)
, m_height(renderView ? renderView->layoutViewportHeight() : 0)
{
}
CSSToLengthConversionData::CSSToLengthConversionData(const RenderStyle* style, const FontSizes& fontSizes, const ViewportSize& viewportSize, float zoom)
: m_style(style)
, m_fontSizes(fontSizes)
, m_viewportSize(viewportSize)
, m_zoom(zoom)
{
ASSERT(m_style);
ASSERT(zoom > 0);
}
CSSToLengthConversionData::CSSToLengthConversionData(const RenderStyle* style, const RenderStyle* rootStyle, const RenderView* renderView, float zoom)
: CSSToLengthConversionData(style, FontSizes(style, rootStyle), ViewportSize(renderView), zoom)
{
}
double CSSToLengthConversionData::viewportWidthPercent() const
{
m_style->setHasViewportUnits();
return m_viewportSize.width() / 100;
}
double CSSToLengthConversionData::viewportHeightPercent() const
{
m_style->setHasViewportUnits();
return m_viewportSize.height() / 100;
}
double CSSToLengthConversionData::viewportMinPercent() const
{
m_style->setHasViewportUnits();
return std::min(m_viewportSize.width(), m_viewportSize.height()) / 100;
}
double CSSToLengthConversionData::viewportMaxPercent() const
{
m_style->setHasViewportUnits();
return std::max(m_viewportSize.width(), m_viewportSize.height()) / 100;
}
} // namespace blink
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