| /* |
| * 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 "core/css/CSSToLengthConversionData.h" |
| |
| #include "core/css/CSSHelper.h" |
| #include "core/layout/api/LayoutViewItem.h" |
| #include "core/style/ComputedStyle.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&. |
| DCHECK(m_font); |
| } |
| |
| CSSToLengthConversionData::FontSizes::FontSizes(const ComputedStyle* style, |
| const ComputedStyle* rootStyle) |
| : FontSizes(style->computedFontSize(), |
| rootStyle ? rootStyle->computedFontSize() : 1.0f, |
| &style->font()) {} |
| |
| float CSSToLengthConversionData::FontSizes::ex() const { |
| DCHECK(m_font); |
| const SimpleFontData* fontData = m_font->primaryFont(); |
| DCHECK(fontData); |
| |
| // 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 layoutObject font. |
| if (!fontData || !fontData->getFontMetrics().hasXHeight()) |
| return m_em / 2.0f; |
| return fontData->getFontMetrics().xHeight(); |
| } |
| |
| float CSSToLengthConversionData::FontSizes::ch() const { |
| DCHECK(m_font); |
| const SimpleFontData* fontData = m_font->primaryFont(); |
| DCHECK(fontData); |
| return fontData ? fontData->getFontMetrics().zeroWidth() : 0; |
| } |
| |
| CSSToLengthConversionData::ViewportSize::ViewportSize( |
| const LayoutViewItem& layoutViewItem) |
| : m_size(!layoutViewItem.isNull() |
| ? layoutViewItem.viewportSizeForViewportUnits() |
| : DoubleSize()) {} |
| |
| CSSToLengthConversionData::CSSToLengthConversionData( |
| const ComputedStyle* style, |
| const FontSizes& fontSizes, |
| const ViewportSize& viewportSize, |
| float zoom) |
| : m_style(style), |
| m_fontSizes(fontSizes), |
| m_viewportSize(viewportSize), |
| m_zoom(clampTo<float>(zoom, std::numeric_limits<float>::denorm_min())) { |
| } |
| |
| CSSToLengthConversionData::CSSToLengthConversionData( |
| const ComputedStyle* style, |
| const ComputedStyle* rootStyle, |
| const LayoutViewItem& layoutViewItem, |
| float zoom) |
| : CSSToLengthConversionData(style, |
| FontSizes(style, rootStyle), |
| ViewportSize(layoutViewItem), |
| zoom) {} |
| |
| double CSSToLengthConversionData::viewportWidthPercent() const { |
| // FIXME: Remove m_style from this class. Plumb viewport and rem unit |
| // information through as output parameters on functions involved in length |
| // resolution. |
| const_cast<ComputedStyle*>(m_style)->setHasViewportUnits(); |
| return m_viewportSize.width() / 100; |
| } |
| double CSSToLengthConversionData::viewportHeightPercent() const { |
| const_cast<ComputedStyle*>(m_style)->setHasViewportUnits(); |
| return m_viewportSize.height() / 100; |
| } |
| double CSSToLengthConversionData::viewportMinPercent() const { |
| const_cast<ComputedStyle*>(m_style)->setHasViewportUnits(); |
| return std::min(m_viewportSize.width(), m_viewportSize.height()) / 100; |
| } |
| double CSSToLengthConversionData::viewportMaxPercent() const { |
| const_cast<ComputedStyle*>(m_style)->setHasViewportUnits(); |
| return std::max(m_viewportSize.width(), m_viewportSize.height()) / 100; |
| } |
| |
| float CSSToLengthConversionData::remFontSize() const { |
| const_cast<ComputedStyle*>(m_style)->setHasRemUnits(); |
| return m_fontSizes.rem(); |
| } |
| |
| double CSSToLengthConversionData::zoomedComputedPixels( |
| double value, |
| CSSPrimitiveValue::UnitType type) const { |
| // The logic in this function is duplicated in MediaValues::computeLength() |
| // because MediaValues::computeLength() needs nearly identical logic, but we |
| // haven't found a way to make zoomedComputedPixels() more generic (to solve |
| // both cases) without hurting performance. |
| switch (type) { |
| case CSSPrimitiveValue::UnitType::Pixels: |
| case CSSPrimitiveValue::UnitType::UserUnits: |
| return value * zoom(); |
| |
| case CSSPrimitiveValue::UnitType::Centimeters: |
| return value * cssPixelsPerCentimeter * zoom(); |
| |
| case CSSPrimitiveValue::UnitType::Millimeters: |
| return value * cssPixelsPerMillimeter * zoom(); |
| |
| case CSSPrimitiveValue::UnitType::Inches: |
| return value * cssPixelsPerInch * zoom(); |
| |
| case CSSPrimitiveValue::UnitType::Points: |
| return value * cssPixelsPerPoint * zoom(); |
| |
| case CSSPrimitiveValue::UnitType::Picas: |
| return value * cssPixelsPerPica * zoom(); |
| |
| case CSSPrimitiveValue::UnitType::ViewportWidth: |
| return value * viewportWidthPercent() * zoom(); |
| |
| case CSSPrimitiveValue::UnitType::ViewportHeight: |
| return value * viewportHeightPercent() * zoom(); |
| |
| case CSSPrimitiveValue::UnitType::ViewportMin: |
| return value * viewportMinPercent() * zoom(); |
| |
| case CSSPrimitiveValue::UnitType::ViewportMax: |
| return value * viewportMaxPercent() * zoom(); |
| |
| // We do not apply the zoom factor when we are computing the value of the |
| // font-size property. The zooming for font sizes is much more complicated, |
| // since we have to worry about enforcing the minimum font size preference |
| // as well as enforcing the implicit "smart minimum." |
| case CSSPrimitiveValue::UnitType::Ems: |
| case CSSPrimitiveValue::UnitType::QuirkyEms: |
| return value * emFontSize(); |
| |
| case CSSPrimitiveValue::UnitType::Exs: |
| return value * exFontSize(); |
| |
| case CSSPrimitiveValue::UnitType::Rems: |
| return value * remFontSize(); |
| |
| case CSSPrimitiveValue::UnitType::Chs: |
| return value * chFontSize(); |
| |
| default: |
| NOTREACHED(); |
| return 0; |
| } |
| } |
| |
| } // namespace blink |