| /* |
| * Copyright (C) 2004, 2005, 2006 Nikolas Zimmermann <zimmermann@kde.org> |
| * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org> |
| * Copyright (C) 2007 Apple Inc. All rights reserved. |
| * Copyright (C) Research In Motion Limited 2011. All rights reserved. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| */ |
| |
| #include "third_party/blink/renderer/core/svg/svg_length_context.h" |
| |
| #include <cmath> |
| |
| #include "third_party/blink/renderer/core/css/css_primitive_value.h" |
| #include "third_party/blink/renderer/core/css/css_resolution_units.h" |
| #include "third_party/blink/renderer/core/css/css_to_length_conversion_data.h" |
| #include "third_party/blink/renderer/core/dom/node_computed_style.h" |
| #include "third_party/blink/renderer/core/frame/local_frame_view.h" |
| #include "third_party/blink/renderer/core/layout/adjust_for_absolute_zoom.h" |
| #include "third_party/blink/renderer/core/layout/layout_object.h" |
| #include "third_party/blink/renderer/core/style/computed_style.h" |
| #include "third_party/blink/renderer/core/svg/svg_length.h" |
| #include "third_party/blink/renderer/core/svg/svg_svg_element.h" |
| #include "third_party/blink/renderer/platform/fonts/font_metrics.h" |
| #include "third_party/blink/renderer/platform/geometry/length_functions.h" |
| #include "third_party/blink/renderer/platform/geometry/length_point.h" |
| #include "ui/gfx/geometry/size_f.h" |
| #include "ui/gfx/geometry/vector2d_f.h" |
| |
| namespace blink { |
| |
| namespace { |
| |
| const ComputedStyle* ComputedStyleForLengthResolving( |
| const SVGElement* context) { |
| if (!context) { |
| return nullptr; |
| } |
| |
| const ContainerNode* current_context = context; |
| do { |
| if (current_context->GetLayoutObject()) { |
| return current_context->GetLayoutObject()->Style(); |
| } |
| current_context = current_context->parentNode(); |
| } while (current_context); |
| |
| // We can end up here if trying to resolve values for elements in an |
| // inactive document. |
| return nullptr; |
| } |
| |
| const ComputedStyle* RootElementStyle(const Node* context) { |
| if (!context) { |
| return nullptr; |
| } |
| |
| const Document& document = context->GetDocument(); |
| Node* document_element = document.documentElement(); |
| const ComputedStyle* document_style = document.GetComputedStyle(); |
| const ComputedStyle* style = document_element && context != document_element |
| ? document_element->GetComputedStyle() |
| : document_style; |
| if (!style) { |
| style = document_style; |
| } |
| return style; |
| } |
| |
| class CSSToLengthConversionDataContext { |
| STACK_ALLOCATED(); |
| |
| public: |
| explicit CSSToLengthConversionDataContext(const SVGElement* context) |
| : context_(context), |
| style_(ComputedStyleForLengthResolving(context)), |
| root_style_(RootElementStyle(context)) {} |
| |
| bool HasStyle() const { return style_; } |
| |
| CSSToLengthConversionData MakeConversionData() const { |
| DCHECK(context_); |
| DCHECK(HasStyle()); |
| return CSSToLengthConversionData(style_, style_, root_style_, |
| context_->GetDocument().GetLayoutView(), |
| CSSToLengthConversionData::ContainerSizes( |
| context_->ParentOrShadowHostElement()), |
| 1.0f, ignored_flags_); |
| } |
| |
| private: |
| const SVGElement* context_ = nullptr; |
| const ComputedStyle* style_ = nullptr; |
| const ComputedStyle* root_style_ = nullptr; |
| mutable CSSToLengthConversionData::Flags ignored_flags_ = 0; |
| }; |
| |
| float ObjectBoundingBoxUnitToUserUnits(const Length& length, |
| float ref_dimension) { |
| // For "plain" percentages we resolve against the real reference dimension |
| // and scale with the unit dimension to avoid losing precision for common |
| // cases. In essence because of the difference between: |
| // |
| // v * percentage / 100 |
| // |
| // and: |
| // |
| // v * (percentage / 100) |
| // |
| // for certain, common, values of v and percentage. |
| float unit_dimension = 1; |
| if (length.IsPercent()) { |
| std::swap(unit_dimension, ref_dimension); |
| } |
| return FloatValueForLength(length, unit_dimension, nullptr) * ref_dimension; |
| } |
| |
| float ConvertValueFromUserUnitsToEMS(const ComputedStyle* style, float value) { |
| if (!style) { |
| return 0; |
| } |
| float font_size = style->SpecifiedFontSize(); |
| if (!font_size) { |
| return 0; |
| } |
| return value / font_size; |
| } |
| |
| float ConvertValueFromEMSToUserUnits(const ComputedStyle* style, float value) { |
| if (!style) { |
| return 0; |
| } |
| return value * style->SpecifiedFontSize(); |
| } |
| |
| float ConvertValueFromUserUnitsToEXS(const ComputedStyle* style, float value) { |
| if (!style) { |
| return 0; |
| } |
| const SimpleFontData* font_data = style->GetFont().PrimaryFont(); |
| if (!font_data) { |
| return 0; |
| } |
| // Use of ceil allows a pixel match to the W3Cs expected output of |
| // coords-units-03-b.svg, if this causes problems in real world cases maybe it |
| // would be best to remove this. |
| float x_height = |
| ceilf(font_data->GetFontMetrics().XHeight() / style->EffectiveZoom()); |
| if (!x_height) { |
| return 0; |
| } |
| return value / x_height; |
| } |
| |
| float ConvertValueFromEXSToUserUnits(const ComputedStyle* style, float value) { |
| if (!style) { |
| return 0; |
| } |
| const SimpleFontData* font_data = style->GetFont().PrimaryFont(); |
| if (!font_data) { |
| return 0; |
| } |
| // Use of ceil allows a pixel match to the W3Cs expected output of |
| // coords-units-03-b.svg, if this causes problems in real world cases maybe it |
| // would be best to remove this. |
| return value * |
| ceilf(font_data->GetFontMetrics().XHeight() / style->EffectiveZoom()); |
| } |
| |
| float ConvertValueFromUserUnitsToCHS(const ComputedStyle* style, float value) { |
| if (!style) { |
| return 0; |
| } |
| const SimpleFontData* font_data = style->GetFont().PrimaryFont(); |
| if (!font_data) { |
| return 0; |
| } |
| float zero_width = |
| font_data->GetFontMetrics().ZeroWidth() / style->EffectiveZoom(); |
| if (!zero_width) { |
| return 0; |
| } |
| return value / zero_width; |
| } |
| |
| float ConvertValueFromCHSToUserUnits(const ComputedStyle* style, float value) { |
| if (!style) { |
| return 0; |
| } |
| const SimpleFontData* font_data = style->GetFont().PrimaryFont(); |
| if (!font_data) { |
| return 0; |
| } |
| return value * font_data->GetFontMetrics().ZeroWidth() / |
| style->EffectiveZoom(); |
| } |
| |
| float ConvertValueFromUserUnitsToICS(const ComputedStyle* style, float value) { |
| if (!style) { |
| return 0; |
| } |
| const SimpleFontData* font_data = style->GetFont().PrimaryFont(); |
| if (!font_data) { |
| return 0; |
| } |
| float ideographic_full_width = |
| font_data->GetFontMetrics().IdeographicFullWidth().value_or( |
| style->ComputedFontSize()) / |
| style->EffectiveZoom(); |
| if (!ideographic_full_width) { |
| return 0; |
| } |
| return value / ideographic_full_width; |
| } |
| |
| float ConvertValueFromICSToUserUnits(const ComputedStyle* style, float value) { |
| if (!style) { |
| return 0; |
| } |
| const SimpleFontData* font_data = style->GetFont().PrimaryFont(); |
| if (!font_data) { |
| return 0; |
| } |
| return value * |
| font_data->GetFontMetrics().IdeographicFullWidth().value_or( |
| style->ComputedFontSize()) / |
| style->EffectiveZoom(); |
| } |
| |
| float ConvertValueFromUserUnitsToLHS(const ComputedStyle* style, float value) { |
| return value / AdjustForAbsoluteZoom::AdjustFloat(style->ComputedLineHeight(), |
| *style); |
| } |
| |
| float ConvertValueFromLHSToUserUnits(const ComputedStyle* style, float value) { |
| return value * AdjustForAbsoluteZoom::AdjustFloat(style->ComputedLineHeight(), |
| *style); |
| } |
| |
| inline float ViewportLengthPercent(const float width_or_height) { |
| return width_or_height / 100; |
| } |
| |
| inline float ViewportMinPercent(const gfx::SizeF& viewport_size) { |
| return std::min(viewport_size.width(), viewport_size.height()) / 100; |
| } |
| |
| inline float ViewportMaxPercent(const gfx::SizeF& viewport_size) { |
| return std::max(viewport_size.width(), viewport_size.height()) / 100; |
| } |
| |
| inline float DimensionForViewportUnit(const SVGElement* context, |
| CSSPrimitiveValue::UnitType unit) { |
| if (!context) { |
| return 0; |
| } |
| |
| const Document& document = context->GetDocument(); |
| LocalFrameView* view = document.View(); |
| if (!view) { |
| return 0; |
| } |
| |
| const ComputedStyle* style = ComputedStyleForLengthResolving(context); |
| if (!style) { |
| return 0; |
| } |
| |
| gfx::SizeF viewport_size(view->Width(), view->Height()); |
| |
| switch (unit) { |
| case CSSPrimitiveValue::UnitType::kViewportWidth: |
| return ViewportLengthPercent(viewport_size.width()) / |
| style->EffectiveZoom(); |
| |
| case CSSPrimitiveValue::UnitType::kViewportHeight: |
| return ViewportLengthPercent(viewport_size.height()) / |
| style->EffectiveZoom(); |
| |
| case CSSPrimitiveValue::UnitType::kViewportMin: |
| return ViewportMinPercent(viewport_size) / style->EffectiveZoom(); |
| |
| case CSSPrimitiveValue::UnitType::kViewportMax: |
| return ViewportMaxPercent(viewport_size) / style->EffectiveZoom(); |
| default: |
| break; |
| } |
| |
| NOTREACHED(); |
| return 0; |
| } |
| |
| } // namespace |
| |
| SVGLengthContext::SVGLengthContext(const SVGElement* context) |
| : context_(context) {} |
| |
| gfx::RectF SVGLengthContext::ResolveRectangle(const SVGElement* context, |
| SVGUnitTypes::SVGUnitType type, |
| const gfx::RectF& viewport, |
| const SVGLength& x, |
| const SVGLength& y, |
| const SVGLength& width, |
| const SVGLength& height) { |
| DCHECK_NE(SVGUnitTypes::kSvgUnitTypeUnknown, type); |
| CSSToLengthConversionDataContext conversion_context(context); |
| if (!conversion_context.HasStyle()) { |
| return gfx::RectF(0, 0, 0, 0); |
| } |
| const CSSToLengthConversionData conversion_data = |
| conversion_context.MakeConversionData(); |
| // Convert SVGLengths to Lengths (preserves percentages). |
| const LengthPoint point( |
| x.AsCSSPrimitiveValue().ConvertToLength(conversion_data), |
| y.AsCSSPrimitiveValue().ConvertToLength(conversion_data)); |
| const LengthSize size( |
| width.AsCSSPrimitiveValue().ConvertToLength(conversion_data), |
| height.AsCSSPrimitiveValue().ConvertToLength(conversion_data)); |
| |
| gfx::RectF resolved_rect; |
| // If the requested unit is 'objectBoundingBox' then the resolved user units |
| // are actually normalized (in bounding box units), so transform them to the |
| // actual user space. |
| if (type == SVGUnitTypes::kSvgUnitTypeObjectboundingbox) { |
| // Resolve the Lengths to user units. |
| resolved_rect = gfx::RectF( |
| ObjectBoundingBoxUnitToUserUnits(point.X(), viewport.width()), |
| ObjectBoundingBoxUnitToUserUnits(point.Y(), viewport.height()), |
| ObjectBoundingBoxUnitToUserUnits(size.Width(), viewport.width()), |
| ObjectBoundingBoxUnitToUserUnits(size.Height(), viewport.height())); |
| resolved_rect += viewport.OffsetFromOrigin(); |
| } else { |
| DCHECK_EQ(type, SVGUnitTypes::kSvgUnitTypeUserspaceonuse); |
| // Determine the viewport to use for resolving the Lengths to user units. |
| gfx::SizeF viewport_size_for_resolve; |
| if (size.Width().IsPercentOrCalc() || size.Height().IsPercentOrCalc() || |
| point.X().IsPercentOrCalc() || point.Y().IsPercentOrCalc()) { |
| viewport_size_for_resolve = SVGLengthContext(context).ResolveViewport(); |
| } |
| // Resolve the Lengths to user units. |
| resolved_rect = |
| gfx::RectF(PointForLengthPoint(point, viewport_size_for_resolve), |
| SizeForLengthSize(size, viewport_size_for_resolve)); |
| } |
| return resolved_rect; |
| } |
| |
| gfx::Vector2dF SVGLengthContext::ResolveLengthPair( |
| const Length& x_length, |
| const Length& y_length, |
| const ComputedStyle& style) const { |
| gfx::SizeF viewport_size; |
| if (x_length.IsPercentOrCalc() || y_length.IsPercentOrCalc()) { |
| viewport_size = ResolveViewport(); |
| // If either |x_length| or |y_length| is 'auto', set that viewport dimension |
| // to zero so that the corresponding Length resolves to zero. This matches |
| // the behavior of ValueForLength() below. |
| if (x_length.IsAuto()) { |
| viewport_size.set_width(0); |
| } else if (y_length.IsAuto()) { |
| viewport_size.set_height(0); |
| } |
| } |
| float zoom = style.EffectiveZoom(); |
| return gfx::Vector2dF(ValueForLength(x_length, zoom, viewport_size.width()), |
| ValueForLength(y_length, zoom, viewport_size.height())); |
| } |
| |
| float SVGLengthContext::ResolveValue(const CSSPrimitiveValue& primitive_value, |
| SVGLengthMode mode) const { |
| CSSToLengthConversionDataContext conversion_context(context_); |
| if (!conversion_context.HasStyle()) { |
| return 0; |
| } |
| const Length& length = |
| primitive_value.ConvertToLength(conversion_context.MakeConversionData()); |
| return ValueForLength(length, 1.0f, mode); |
| } |
| |
| Length SVGLengthContext::ConvertToLength(const SVGLength& length) const { |
| CSSToLengthConversionDataContext conversion_context(context_); |
| if (!conversion_context.HasStyle()) { |
| return Length::Fixed(0); |
| } |
| return length.AsCSSPrimitiveValue().ConvertToLength( |
| conversion_context.MakeConversionData()); |
| } |
| |
| LengthPoint SVGLengthContext::ConvertToLengthPoint(const SVGLength& x, |
| const SVGLength& y) const { |
| CSSToLengthConversionDataContext conversion_context(context_); |
| if (!conversion_context.HasStyle()) { |
| return LengthPoint(Length::Fixed(0), Length::Fixed(0)); |
| } |
| const CSSToLengthConversionData conversion_data = |
| conversion_context.MakeConversionData(); |
| return LengthPoint(x.AsCSSPrimitiveValue().ConvertToLength(conversion_data), |
| y.AsCSSPrimitiveValue().ConvertToLength(conversion_data)); |
| } |
| |
| float SVGLengthContext::ValueForLength(const UnzoomedLength& unzoomed_length, |
| SVGLengthMode mode) const { |
| return ValueForLength(unzoomed_length.length(), 1, mode); |
| } |
| |
| float SVGLengthContext::ValueForLength(const Length& length, |
| const ComputedStyle& style, |
| SVGLengthMode mode) const { |
| return ValueForLength(length, style.EffectiveZoom(), mode); |
| } |
| |
| float SVGLengthContext::ValueForLength(const Length& length, |
| float zoom, |
| SVGLengthMode mode) const { |
| // The viewport will be unaffected by zoom. |
| const float dimension = |
| length.IsPercentOrCalc() ? ViewportDimension(mode) : 0; |
| return ValueForLength(length, zoom, dimension); |
| } |
| |
| float SVGLengthContext::ValueForLength(const Length& length, |
| const ComputedStyle& style, |
| float dimension) { |
| return ValueForLength(length, style.EffectiveZoom(), dimension); |
| } |
| |
| float SVGLengthContext::ValueForLength(const Length& length, |
| float zoom, |
| float dimension) { |
| DCHECK_NE(zoom, 0); |
| // Only "specified" lengths have meaning for SVG. |
| if (!length.IsSpecified()) { |
| return 0; |
| } |
| return FloatValueForLength(length, dimension * zoom) / zoom; |
| } |
| |
| float SVGLengthContext::ConvertValueToUserUnits( |
| float value, |
| SVGLengthMode mode, |
| CSSPrimitiveValue::UnitType from_unit) const { |
| double user_units = value; |
| switch (from_unit) { |
| case CSSPrimitiveValue::UnitType::kPixels: |
| case CSSPrimitiveValue::UnitType::kNumber: |
| case CSSPrimitiveValue::UnitType::kInteger: |
| case CSSPrimitiveValue::UnitType::kUserUnits: |
| user_units = value; |
| break; |
| case CSSPrimitiveValue::UnitType::kPercentage: |
| user_units = value * ViewportDimension(mode) / 100; |
| break; |
| case CSSPrimitiveValue::UnitType::kEms: |
| user_units = ConvertValueFromEMSToUserUnits( |
| ComputedStyleForLengthResolving(context_), value); |
| break; |
| case CSSPrimitiveValue::UnitType::kExs: |
| user_units = ConvertValueFromEXSToUserUnits( |
| ComputedStyleForLengthResolving(context_), value); |
| break; |
| case CSSPrimitiveValue::UnitType::kCentimeters: |
| user_units = value * kCssPixelsPerCentimeter; |
| break; |
| case CSSPrimitiveValue::UnitType::kMillimeters: |
| user_units = value * kCssPixelsPerMillimeter; |
| break; |
| case CSSPrimitiveValue::UnitType::kQuarterMillimeters: |
| user_units = value * kCssPixelsPerQuarterMillimeter; |
| break; |
| case CSSPrimitiveValue::UnitType::kInches: |
| user_units = value * kCssPixelsPerInch; |
| break; |
| case CSSPrimitiveValue::UnitType::kPoints: |
| user_units = value * kCssPixelsPerPoint; |
| break; |
| case CSSPrimitiveValue::UnitType::kPicas: |
| user_units = value * kCssPixelsPerPica; |
| break; |
| case CSSPrimitiveValue::UnitType::kRems: |
| user_units = |
| ConvertValueFromEMSToUserUnits(RootElementStyle(context_), value); |
| break; |
| case CSSPrimitiveValue::UnitType::kRexs: |
| user_units = |
| ConvertValueFromEXSToUserUnits(RootElementStyle(context_), value); |
| break; |
| case CSSPrimitiveValue::UnitType::kChs: |
| user_units = ConvertValueFromCHSToUserUnits( |
| ComputedStyleForLengthResolving(context_), value); |
| break; |
| case CSSPrimitiveValue::UnitType::kRchs: |
| user_units = |
| ConvertValueFromCHSToUserUnits(RootElementStyle(context_), value); |
| break; |
| case CSSPrimitiveValue::UnitType::kIcs: |
| user_units = ConvertValueFromICSToUserUnits( |
| ComputedStyleForLengthResolving(context_), value); |
| break; |
| case CSSPrimitiveValue::UnitType::kRics: |
| user_units = |
| ConvertValueFromICSToUserUnits(RootElementStyle(context_), value); |
| break; |
| case CSSPrimitiveValue::UnitType::kLhs: |
| user_units = ConvertValueFromLHSToUserUnits( |
| ComputedStyleForLengthResolving(context_), value); |
| break; |
| case CSSPrimitiveValue::UnitType::kRlhs: |
| user_units = |
| ConvertValueFromLHSToUserUnits(RootElementStyle(context_), value); |
| break; |
| case CSSPrimitiveValue::UnitType::kViewportWidth: |
| case CSSPrimitiveValue::UnitType::kViewportHeight: |
| case CSSPrimitiveValue::UnitType::kViewportMin: |
| case CSSPrimitiveValue::UnitType::kViewportMax: |
| user_units = value * DimensionForViewportUnit(context_, from_unit); |
| break; |
| case CSSPrimitiveValue::UnitType::kContainerWidth: |
| case CSSPrimitiveValue::UnitType::kContainerHeight: |
| case CSSPrimitiveValue::UnitType::kContainerInlineSize: |
| case CSSPrimitiveValue::UnitType::kContainerBlockSize: |
| case CSSPrimitiveValue::UnitType::kContainerMin: |
| case CSSPrimitiveValue::UnitType::kContainerMax: |
| NOTREACHED() << "Must be handled using ResolveValue"; |
| break; |
| default: |
| NOTREACHED(); |
| break; |
| } |
| |
| // Since we mix css <length> values with svg's length values we need to |
| // clamp values to the narrowest range, otherwise it can result in |
| // rendering issues. |
| return CSSPrimitiveValue::ClampToCSSLengthRange(user_units); |
| } |
| |
| float SVGLengthContext::ConvertValueFromUserUnits( |
| float value, |
| SVGLengthMode mode, |
| CSSPrimitiveValue::UnitType to_unit) const { |
| switch (to_unit) { |
| case CSSPrimitiveValue::UnitType::kPixels: |
| case CSSPrimitiveValue::UnitType::kNumber: |
| case CSSPrimitiveValue::UnitType::kInteger: |
| case CSSPrimitiveValue::UnitType::kUserUnits: |
| return value; |
| case CSSPrimitiveValue::UnitType::kPercentage: { |
| const float dimension = ViewportDimension(mode); |
| if (!dimension) { |
| return 0; |
| } |
| // LengthTypePercentage is represented with 100% = 100.0. |
| // Good for accuracy but could eventually be changed. |
| return value * 100 / dimension; |
| } |
| case CSSPrimitiveValue::UnitType::kEms: |
| return ConvertValueFromUserUnitsToEMS( |
| ComputedStyleForLengthResolving(context_), value); |
| case CSSPrimitiveValue::UnitType::kExs: |
| return ConvertValueFromUserUnitsToEXS( |
| ComputedStyleForLengthResolving(context_), value); |
| case CSSPrimitiveValue::UnitType::kRems: |
| return ConvertValueFromUserUnitsToEMS(RootElementStyle(context_), value); |
| case CSSPrimitiveValue::UnitType::kRexs: |
| return ConvertValueFromUserUnitsToEXS(RootElementStyle(context_), value); |
| case CSSPrimitiveValue::UnitType::kChs: |
| return ConvertValueFromUserUnitsToCHS( |
| ComputedStyleForLengthResolving(context_), value); |
| case CSSPrimitiveValue::UnitType::kRchs: |
| return ConvertValueFromUserUnitsToCHS(RootElementStyle(context_), value); |
| case CSSPrimitiveValue::UnitType::kIcs: |
| return ConvertValueFromUserUnitsToICS( |
| ComputedStyleForLengthResolving(context_), value); |
| case CSSPrimitiveValue::UnitType::kRics: |
| return ConvertValueFromUserUnitsToICS(RootElementStyle(context_), value); |
| case CSSPrimitiveValue::UnitType::kLhs: |
| return ConvertValueFromUserUnitsToLHS( |
| ComputedStyleForLengthResolving(context_), value); |
| case CSSPrimitiveValue::UnitType::kRlhs: |
| return ConvertValueFromUserUnitsToLHS(RootElementStyle(context_), value); |
| case CSSPrimitiveValue::UnitType::kCentimeters: |
| return value / kCssPixelsPerCentimeter; |
| case CSSPrimitiveValue::UnitType::kMillimeters: |
| return value / kCssPixelsPerMillimeter; |
| case CSSPrimitiveValue::UnitType::kQuarterMillimeters: |
| return value / kCssPixelsPerQuarterMillimeter; |
| case CSSPrimitiveValue::UnitType::kInches: |
| return value / kCssPixelsPerInch; |
| case CSSPrimitiveValue::UnitType::kPoints: |
| return value / kCssPixelsPerPoint; |
| case CSSPrimitiveValue::UnitType::kPicas: |
| return value / kCssPixelsPerPica; |
| case CSSPrimitiveValue::UnitType::kViewportWidth: |
| case CSSPrimitiveValue::UnitType::kViewportHeight: |
| case CSSPrimitiveValue::UnitType::kViewportMin: |
| case CSSPrimitiveValue::UnitType::kViewportMax: |
| return value / DimensionForViewportUnit(context_, to_unit); |
| case CSSPrimitiveValue::UnitType::kContainerWidth: |
| case CSSPrimitiveValue::UnitType::kContainerHeight: |
| case CSSPrimitiveValue::UnitType::kContainerInlineSize: |
| case CSSPrimitiveValue::UnitType::kContainerBlockSize: |
| case CSSPrimitiveValue::UnitType::kContainerMin: |
| case CSSPrimitiveValue::UnitType::kContainerMax: |
| NOTREACHED() << "Must be handled using ResolveValue"; |
| break; |
| default: |
| break; |
| } |
| |
| NOTREACHED(); |
| return 0; |
| } |
| |
| gfx::SizeF SVGLengthContext::ResolveViewport() const { |
| if (!context_) { |
| return gfx::SizeF(); |
| } |
| // Root <svg> element lengths are resolved against the top level viewport. |
| if (context_->IsOutermostSVGSVGElement()) { |
| return To<SVGSVGElement>(context_)->CurrentViewportSize(); |
| } |
| // Take size from nearest viewport element. |
| SVGElement* viewport_element = context_->viewportElement(); |
| const auto* svg = DynamicTo<SVGSVGElement>(viewport_element); |
| if (!svg) { |
| return gfx::SizeF(); |
| } |
| gfx::SizeF viewport_size = svg->CurrentViewBoxRect().size(); |
| if (viewport_size.IsEmpty()) { |
| viewport_size = svg->CurrentViewportSize(); |
| } |
| return viewport_size; |
| } |
| |
| float SVGLengthContext::ViewportDimension(SVGLengthMode mode) const { |
| gfx::SizeF viewport_size = ResolveViewport(); |
| switch (mode) { |
| case SVGLengthMode::kWidth: |
| return viewport_size.width(); |
| case SVGLengthMode::kHeight: |
| return viewport_size.height(); |
| case SVGLengthMode::kOther: |
| // Returns the normalized diagonal length of the viewport, as defined in |
| // https://www.w3.org/TR/SVG2/coords.html#Units. |
| return ClampTo<float>(std::sqrt( |
| gfx::Vector2dF(viewport_size.width(), viewport_size.height()) |
| .LengthSquared() / |
| 2)); |
| } |
| NOTREACHED(); |
| return 0; |
| } |
| |
| } // namespace blink |
