| /* |
| * 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 "third_party/blink/renderer/core/css/css_to_length_conversion_data.h" |
| |
| #include "third_party/blink/renderer/core/css/css_resolution_units.h" |
| #include "third_party/blink/renderer/core/layout/layout_view.h" |
| #include "third_party/blink/renderer/core/style/computed_style.h" |
| |
| namespace blink { |
| |
| CSSToLengthConversionData::FontSizes::FontSizes(float em, |
| float rem, |
| const Font* font) |
| : em_(em), rem_(rem), font_(font) { |
| // FIXME: Improve RAII of StyleResolverState to use const Font&. |
| DCHECK(font_); |
| } |
| |
| CSSToLengthConversionData::FontSizes::FontSizes(const ComputedStyle* style, |
| const ComputedStyle* root_style) |
| : FontSizes(style->ComputedFontSize(), |
| root_style ? root_style->ComputedFontSize() : 1.0f, |
| &style->GetFont()) {} |
| |
| float CSSToLengthConversionData::FontSizes::Ex() const { |
| DCHECK(font_); |
| const SimpleFontData* font_data = font_->PrimaryFont(); |
| DCHECK(font_data); |
| |
| // 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 (!font_data || !font_data->GetFontMetrics().HasXHeight()) |
| return em_ / 2.0f; |
| return font_data->GetFontMetrics().XHeight(); |
| } |
| |
| float CSSToLengthConversionData::FontSizes::Ch() const { |
| DCHECK(font_); |
| const SimpleFontData* font_data = font_->PrimaryFont(); |
| DCHECK(font_data); |
| return font_data ? font_data->GetFontMetrics().ZeroWidth() : 0; |
| } |
| |
| CSSToLengthConversionData::ViewportSize::ViewportSize( |
| const LayoutView* layout_view) |
| : size_(layout_view ? layout_view->ViewportSizeForViewportUnits() |
| : DoubleSize()) {} |
| |
| CSSToLengthConversionData::CSSToLengthConversionData( |
| const ComputedStyle* style, |
| const FontSizes& font_sizes, |
| const ViewportSize& viewport_size, |
| float zoom) |
| : style_(style), |
| font_sizes_(font_sizes), |
| viewport_size_(viewport_size), |
| zoom_(clampTo<float>(zoom, std::numeric_limits<float>::denorm_min())) {} |
| |
| CSSToLengthConversionData::CSSToLengthConversionData( |
| const ComputedStyle* style, |
| const ComputedStyle* root_style, |
| const LayoutView* layout_view, |
| float zoom) |
| : CSSToLengthConversionData(style, |
| FontSizes(style, root_style), |
| ViewportSize(layout_view), |
| zoom) {} |
| |
| double CSSToLengthConversionData::ViewportWidthPercent() const { |
| // FIXME: Remove style_ from this class. Plumb viewport and rem unit |
| // information through as output parameters on functions involved in length |
| // resolution. |
| if (style_) |
| const_cast<ComputedStyle*>(style_)->SetHasViewportUnits(true); |
| return viewport_size_.Width() / 100; |
| } |
| double CSSToLengthConversionData::ViewportHeightPercent() const { |
| if (style_) |
| const_cast<ComputedStyle*>(style_)->SetHasViewportUnits(true); |
| return viewport_size_.Height() / 100; |
| } |
| double CSSToLengthConversionData::ViewportMinPercent() const { |
| if (style_) |
| const_cast<ComputedStyle*>(style_)->SetHasViewportUnits(true); |
| return std::min(viewport_size_.Width(), viewport_size_.Height()) / 100; |
| } |
| double CSSToLengthConversionData::ViewportMaxPercent() const { |
| if (style_) |
| const_cast<ComputedStyle*>(style_)->SetHasViewportUnits(true); |
| return std::max(viewport_size_.Width(), viewport_size_.Height()) / 100; |
| } |
| |
| float CSSToLengthConversionData::RemFontSize() const { |
| if (style_) |
| const_cast<ComputedStyle*>(style_)->SetHasRemUnits(); |
| return font_sizes_.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::kPixels: |
| case CSSPrimitiveValue::UnitType::kUserUnits: |
| return value * Zoom(); |
| |
| case CSSPrimitiveValue::UnitType::kCentimeters: |
| return value * kCssPixelsPerCentimeter * Zoom(); |
| |
| case CSSPrimitiveValue::UnitType::kMillimeters: |
| return value * kCssPixelsPerMillimeter * Zoom(); |
| |
| case CSSPrimitiveValue::UnitType::kQuarterMillimeters: |
| return value * kCssPixelsPerQuarterMillimeter * Zoom(); |
| |
| case CSSPrimitiveValue::UnitType::kInches: |
| return value * kCssPixelsPerInch * Zoom(); |
| |
| case CSSPrimitiveValue::UnitType::kPoints: |
| return value * kCssPixelsPerPoint * Zoom(); |
| |
| case CSSPrimitiveValue::UnitType::kPicas: |
| return value * kCssPixelsPerPica * Zoom(); |
| |
| case CSSPrimitiveValue::UnitType::kViewportWidth: |
| return value * ViewportWidthPercent() * Zoom(); |
| |
| case CSSPrimitiveValue::UnitType::kViewportHeight: |
| return value * ViewportHeightPercent() * Zoom(); |
| |
| case CSSPrimitiveValue::UnitType::kViewportMin: |
| return value * ViewportMinPercent() * Zoom(); |
| |
| case CSSPrimitiveValue::UnitType::kViewportMax: |
| 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::kEms: |
| case CSSPrimitiveValue::UnitType::kQuirkyEms: |
| return value * EmFontSize(); |
| |
| case CSSPrimitiveValue::UnitType::kExs: |
| return value * ExFontSize(); |
| |
| case CSSPrimitiveValue::UnitType::kRems: |
| return value * RemFontSize(); |
| |
| case CSSPrimitiveValue::UnitType::kChs: |
| return value * ChFontSize(); |
| |
| default: |
| NOTREACHED(); |
| return 0; |
| } |
| } |
| |
| } // namespace blink |