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// Copyright 2014 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef COBALT_LAYOUT_USED_STYLE_H_
#define COBALT_LAYOUT_USED_STYLE_H_
#include "cobalt/cssom/css_computed_style_data.h"
#include "cobalt/cssom/linear_gradient_value.h"
#include "cobalt/cssom/property_list_value.h"
#include "cobalt/cssom/property_value.h"
#include "cobalt/cssom/property_value_visitor.h"
#include "cobalt/cssom/radial_gradient_value.h"
#include "cobalt/cssom/transform_function_list_value.h"
#include "cobalt/cssom/transform_matrix.h"
#include "cobalt/dom/font_cache.h"
#include "cobalt/dom/font_list.h"
#include "cobalt/dom/html_element_context.h"
#include "cobalt/layout/layout_unit.h"
#include "cobalt/layout/size_layout_unit.h"
#include "cobalt/loader/image/animated_image_tracker.h"
#include "cobalt/loader/image/image.h"
#include "cobalt/loader/image/image_cache.h"
#include "cobalt/loader/mesh/mesh_projection.h"
#include "cobalt/math/size.h"
#include "cobalt/math/size_f.h"
#include "cobalt/render_tree/color_rgba.h"
#include "cobalt/render_tree/node.h"
#include "cobalt/render_tree/resource_provider.h"
#include "cobalt/render_tree/rounded_corners.h"
namespace cobalt {
namespace layout {
// The used value is the result of taking the computed value and completing any
// remaining calculations to make it the absolute theoretical value used in
// the layout of the document. If the property does not apply to this element,
// then the element has no used value for that property.
// https://www.w3.org/TR/css-cascade-3/#used
// All used values are expressed in terms of render tree.
//
// This file contains facilities to convert CSSOM values to render tree values
// for properties not affected by the layout, such as "color" or "font-size",
// as for them the used values are the same as the computed values.
class ContainingBlock;
class UsedStyleProvider {
public:
// A function that will attach a camera matrix projection transform to a given
// sub render tree. |max_horizontal_fov_rad| and |max_vertical_fov_rad|
// dictate the minimum field of view to use in that direction, in radians.
// These minimum FOV values are compared against the values derived from
// applying the aspect ratio to the other FOV value, and using whichever one
// is most minimum.
typedef base::Callback<scoped_refptr<render_tree::Node>(
const scoped_refptr<render_tree::Node>&, float max_horizontal_fov_rad,
float max_vertical_fov_rad)> AttachCameraNodeFunction;
UsedStyleProvider(dom::HTMLElementContext* html_element_context,
dom::FontCache* font_cache,
const AttachCameraNodeFunction& attach_camera_node_function,
bool enable_image_animations);
scoped_refptr<dom::FontList> GetUsedFontList(
const scoped_refptr<cssom::PropertyValue>& font_family_refptr,
const scoped_refptr<cssom::PropertyValue>& font_size_refptr,
const scoped_refptr<cssom::PropertyValue>& font_style_refptr,
const scoped_refptr<cssom::PropertyValue>& font_weight_refptr);
scoped_refptr<loader::image::Image> ResolveURLToImage(const GURL& url);
scoped_refptr<loader::mesh::MeshProjection> ResolveURLToMeshProjection(
const GURL& url);
const AttachCameraNodeFunction attach_camera_node_function() const {
return attach_camera_node_function_;
}
// Notifies animated image tracker to update the playing status of animated
// images.
void UpdateAnimatedImages();
bool enable_image_animations() const { return enable_image_animations_; }
private:
// Called after layout is completed so that it can perform any necessary
// cleanup. Its primary current purpose is making a request to the font cache
// to remove any font lists that are no longer being referenced by boxes.
void CleanupAfterLayout();
dom::FontCache* const font_cache_;
loader::image::AnimatedImageTracker* const animated_image_tracker_;
loader::image::ImageCache* const image_cache_;
loader::mesh::MeshCache* const mesh_cache_;
AttachCameraNodeFunction attach_camera_node_function_;
// |font_list_key_| is retained in between lookups so that the font names
// vector will not need to allocate elements each time that it is populated.
dom::FontListKey font_list_key_;
// The last_font member variables are used to speed up |GetUsedFontList()|.
// Around 85% of the time in current clients, the current font list matches
// the last font list, so immediately comparing the current font list's
// properties against the last font list's properties, prior to updating the
// font list key and performing a font cache lookup, results in a significant
// performance improvement.
scoped_refptr<cssom::PropertyValue> last_font_family_refptr_;
scoped_refptr<cssom::PropertyValue> last_font_style_refptr_;
scoped_refptr<cssom::PropertyValue> last_font_weight_refptr_;
scoped_refptr<dom::FontList> last_font_list_;
// If true, animated WebP images should animate, otherwise they should not.
const bool enable_image_animations_;
friend class UsedStyleProviderLayoutScope;
DISALLOW_COPY_AND_ASSIGN(UsedStyleProvider);
};
class UsedStyleProviderLayoutScope {
public:
explicit UsedStyleProviderLayoutScope(UsedStyleProvider* used_style_provider);
~UsedStyleProviderLayoutScope();
private:
UsedStyleProvider* const used_style_provider_;
};
render_tree::ColorRGBA GetUsedColor(
const scoped_refptr<cssom::PropertyValue>& color_refptr);
LayoutUnit GetUsedLength(
const scoped_refptr<cssom::PropertyValue>& length_refptr);
LayoutUnit GetUsedNonNegativeLength(
const scoped_refptr<cssom::PropertyValue>& length_refptr);
class UsedBackgroundNodeProvider
: public cssom::NotReachedPropertyValueVisitor {
public:
UsedBackgroundNodeProvider(
const math::RectF& frame,
const scoped_refptr<cssom::PropertyValue>& background_size,
const scoped_refptr<cssom::PropertyValue>& background_position,
const scoped_refptr<cssom::PropertyValue>& background_repeat,
UsedStyleProvider* used_style_provider);
void VisitAbsoluteURL(cssom::AbsoluteURLValue* url_value) OVERRIDE;
void VisitLinearGradient(
cssom::LinearGradientValue* linear_gradient_value) OVERRIDE;
void VisitRadialGradient(
cssom::RadialGradientValue* radial_gradient_value) OVERRIDE;
scoped_refptr<render_tree::Node> background_node() {
return background_node_;
}
bool is_opaque() const { return is_opaque_; }
private:
const math::RectF frame_;
const scoped_refptr<cssom::PropertyValue> background_size_;
const scoped_refptr<cssom::PropertyValue> background_position_;
const scoped_refptr<cssom::PropertyValue> background_repeat_;
UsedStyleProvider* const used_style_provider_;
scoped_refptr<render_tree::Node> background_node_;
bool is_opaque_;
DISALLOW_COPY_AND_ASSIGN(UsedBackgroundNodeProvider);
};
class UsedBackgroundPositionProvider
: public cssom::NotReachedPropertyValueVisitor {
public:
UsedBackgroundPositionProvider(const math::SizeF& frame_size,
const math::SizeF& image_actual_size);
void VisitPropertyList(
cssom::PropertyListValue* property_list_value) OVERRIDE;
float translate_x() { return translate_x_; }
float translate_y() { return translate_y_; }
float translate_x_relative_to_frame() {
return frame_size_.width() == 0.0f ? 0.0f
: translate_x_ / frame_size_.width();
}
float translate_y_relative_to_frame() {
return frame_size_.height() == 0.0f ? 0.0f
: translate_y_ / frame_size_.height();
}
private:
const math::SizeF frame_size_;
const math::SizeF image_actual_size_;
float translate_x_;
float translate_y_;
DISALLOW_COPY_AND_ASSIGN(UsedBackgroundPositionProvider);
};
class UsedBackgroundRepeatProvider
: public cssom::NotReachedPropertyValueVisitor {
public:
UsedBackgroundRepeatProvider();
void VisitPropertyList(
cssom::PropertyListValue* property_list_value) OVERRIDE;
bool repeat_x() { return repeat_x_; }
bool repeat_y() { return repeat_y_; }
private:
bool repeat_x_;
bool repeat_y_;
DISALLOW_COPY_AND_ASSIGN(UsedBackgroundRepeatProvider);
};
class UsedBackgroundSizeProvider
: public cssom::NotReachedPropertyValueVisitor {
public:
UsedBackgroundSizeProvider(const math::SizeF& frame_size,
const math::Size& image_size);
void VisitPropertyList(
cssom::PropertyListValue* property_list_value) OVERRIDE;
void VisitKeyword(cssom::KeywordValue* keyword) OVERRIDE;
float width_scale_relative_to_frame() const {
return frame_size_.width() == 0.0f ? 0.0f : width_ / frame_size_.width();
}
float height_scale_relative_to_frame() const {
return frame_size_.height() == 0.0f ? 0.0f : height_ / frame_size_.height();
}
float width() const { return width_; }
float height() const { return height_; }
private:
void ConvertWidthAndHeightScale(float width_scale, float height_scale);
const math::SizeF frame_size_;
const math::Size image_size_;
float width_;
float height_;
DISALLOW_COPY_AND_ASSIGN(UsedBackgroundSizeProvider);
};
class UsedBorderRadiusProvider : public cssom::NotReachedPropertyValueVisitor {
public:
explicit UsedBorderRadiusProvider(const math::SizeF& frame_size);
void VisitLength(cssom::LengthValue* length) OVERRIDE;
void VisitPercentage(cssom::PercentageValue* percentage) OVERRIDE;
const base::optional<render_tree::RoundedCorners>& rounded_corners() const {
return rounded_corners_;
}
private:
base::optional<render_tree::RoundedCorners> rounded_corners_;
const math::SizeF frame_size_;
DISALLOW_COPY_AND_ASSIGN(UsedBorderRadiusProvider);
};
class UsedLineHeightProvider : public cssom::NotReachedPropertyValueVisitor {
public:
explicit UsedLineHeightProvider(
const render_tree::FontMetrics& font_metrics,
const scoped_refptr<cssom::PropertyValue>& font_size);
void VisitKeyword(cssom::KeywordValue* keyword) OVERRIDE;
void VisitLength(cssom::LengthValue* length) OVERRIDE;
void VisitNumber(cssom::NumberValue* length) OVERRIDE;
LayoutUnit used_line_height() const { return used_line_height_; }
LayoutUnit half_leading() const { return half_leading_; }
// Half the leading is added above ascent (A) and the other half below
// descent (D), giving the glyph and its leading (L) a total height above
// the baseline of A' = A + L/2 and a total depth of D' = D + L/2.
// https://www.w3.org/TR/CSS21/visudet.html#leading
LayoutUnit baseline_offset_from_top() const {
return LayoutUnit(LayoutUnit(font_metrics_.ascent()) + half_leading_);
}
LayoutUnit baseline_offset_from_bottom() const {
return LayoutUnit(LayoutUnit(font_metrics_.descent()) + half_leading_);
}
private:
void UpdateHalfLeading();
const render_tree::FontMetrics font_metrics_;
const scoped_refptr<cssom::PropertyValue> font_size_;
LayoutUnit used_line_height_;
LayoutUnit half_leading_;
DISALLOW_COPY_AND_ASSIGN(UsedLineHeightProvider);
};
math::Vector2dF GetTransformOrigin(const math::RectF& used_rect,
cssom::PropertyValue* value);
cssom::TransformMatrix GetTransformMatrix(cssom::PropertyValue* value);
// Functions to calculate used values of box model properties.
base::optional<LayoutUnit> GetUsedLeftIfNotAuto(
const scoped_refptr<const cssom::CSSComputedStyleData>& computed_style,
const SizeLayoutUnit& containing_block_size);
base::optional<LayoutUnit> GetUsedTopIfNotAuto(
const scoped_refptr<const cssom::CSSComputedStyleData>& computed_style,
const SizeLayoutUnit& containing_block_size);
base::optional<LayoutUnit> GetUsedRightIfNotAuto(
const scoped_refptr<const cssom::CSSComputedStyleData>& computed_style,
const SizeLayoutUnit& containing_block_size);
base::optional<LayoutUnit> GetUsedBottomIfNotAuto(
const scoped_refptr<const cssom::CSSComputedStyleData>& computed_style,
const SizeLayoutUnit& containing_block_size);
base::optional<LayoutUnit> GetUsedWidthIfNotAuto(
const scoped_refptr<const cssom::CSSComputedStyleData>& computed_style,
const SizeLayoutUnit& containing_block_size,
bool* width_depends_on_containing_block);
base::optional<LayoutUnit> GetUsedMaxHeightIfNotNone(
const scoped_refptr<const cssom::CSSComputedStyleData>& computed_style,
const SizeLayoutUnit& containing_block_size,
bool* height_depends_on_containing_block);
base::optional<LayoutUnit> GetUsedMaxWidthIfNotNone(
const scoped_refptr<const cssom::CSSComputedStyleData>& computed_style,
const SizeLayoutUnit& containing_block_size,
bool* width_depends_on_containing_block);
LayoutUnit GetUsedMinHeight(
const scoped_refptr<const cssom::CSSComputedStyleData>& computed_style,
const SizeLayoutUnit& containing_block_size,
bool* height_depends_on_containing_block);
LayoutUnit GetUsedMinWidth(
const scoped_refptr<const cssom::CSSComputedStyleData>& computed_style,
const SizeLayoutUnit& containing_block_size,
bool* width_depends_on_containing_block);
base::optional<LayoutUnit> GetUsedHeightIfNotAuto(
const scoped_refptr<const cssom::CSSComputedStyleData>& computed_style,
const SizeLayoutUnit& containing_block_size);
base::optional<LayoutUnit> GetUsedMarginLeftIfNotAuto(
const scoped_refptr<const cssom::CSSComputedStyleData>& computed_style,
const SizeLayoutUnit& containing_block_size);
base::optional<LayoutUnit> GetUsedMarginTopIfNotAuto(
const scoped_refptr<const cssom::CSSComputedStyleData>& computed_style,
const SizeLayoutUnit& containing_block_size);
base::optional<LayoutUnit> GetUsedMarginRightIfNotAuto(
const scoped_refptr<const cssom::CSSComputedStyleData>& computed_style,
const SizeLayoutUnit& containing_block_size);
base::optional<LayoutUnit> GetUsedMarginBottomIfNotAuto(
const scoped_refptr<const cssom::CSSComputedStyleData>& computed_style,
const SizeLayoutUnit& containing_block_size);
LayoutUnit GetUsedBorderLeft(
const scoped_refptr<const cssom::CSSComputedStyleData>& computed_style);
LayoutUnit GetUsedBorderTop(
const scoped_refptr<const cssom::CSSComputedStyleData>& computed_style);
LayoutUnit GetUsedBorderRight(
const scoped_refptr<const cssom::CSSComputedStyleData>& computed_style);
LayoutUnit GetUsedBorderBottom(
const scoped_refptr<const cssom::CSSComputedStyleData>& computed_style);
LayoutUnit GetUsedPaddingLeft(
const scoped_refptr<const cssom::CSSComputedStyleData>& computed_style,
const SizeLayoutUnit& containing_block_size);
LayoutUnit GetUsedPaddingTop(
const scoped_refptr<const cssom::CSSComputedStyleData>& computed_style,
const SizeLayoutUnit& containing_block_size);
LayoutUnit GetUsedPaddingRight(
const scoped_refptr<const cssom::CSSComputedStyleData>& computed_style,
const SizeLayoutUnit& containing_block_size);
LayoutUnit GetUsedPaddingBottom(
const scoped_refptr<const cssom::CSSComputedStyleData>& computed_style,
const SizeLayoutUnit& containing_block_size);
} // namespace layout
} // namespace cobalt
#endif // COBALT_LAYOUT_USED_STYLE_H_