| /* |
| * 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/LayoutView.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&. |
| ASSERT(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 |
| { |
| 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 layoutObject 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 LayoutView* layoutView) |
| : m_size(layoutView ? layoutView->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())) |
| { |
| ASSERT(m_style); |
| } |
| |
| CSSToLengthConversionData::CSSToLengthConversionData(const ComputedStyle* style, const ComputedStyle* rootStyle, const LayoutView* layoutView, float zoom) |
| : CSSToLengthConversionData(style, FontSizes(style, rootStyle), ViewportSize(layoutView), 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; |
| } |
| |
| float CSSToLengthConversionData::remFontSize() const |
| { |
| 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: |
| ASSERT_NOT_REACHED(); |
| return 0; |
| } |
| } |
| |
| } // namespace blink |