HTML layout private interface. More...

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Macros
#define	AUTO INT_MIN

Typedefs
typedef uint8_t(*	css_len_func) (const css_computed_style style, css_fixed length, css_unit *unit)

typedef uint8_t(*	css_border_style_func) (const css_computed_style *style)

typedef uint8_t(*	css_border_color_func) (const css_computed_style style, css_color color)

Functions
bool	layout_block_context (struct box block, int viewport_height, html_content content)
	Layout a block formatting context. More...

bool	layout_table (struct box table, int available_width, html_content content)
	Layout a table. More...

bool	layout_flex (struct box flex, int available_width, html_content content)
	Layout a flex container. More...

static bool	lh__box_is_float_box (const struct box *b)
	Layout helper: Check whether box is a float. More...

static bool	lh__box_is_inline_flow (const struct box *b)
	Layout helper: Check whether box takes part in inline flow. More...

static bool	lh__box_is_flex_container (const struct box *b)
	Layout helper: Check whether box takes part in inline flow. More...

static bool	lh__box_is_flex_item (const struct box *b)
	Layout helper: Check whether box takes part in inline flow. More...

static bool	lh__box_is_inline_level (const struct box *b)
	Layout helper: Check whether box is inline level. More...

static bool	lh__box_is_inline_content (const struct box *b)
	Layout helper: Check whether box is inline level. More...

static bool	lh__box_is_object (const struct box *b)
	Layout helper: Check whether box is an object. More...

static bool	lh__box_is_replace (const struct box *b)
	Layout helper: Check whether box is replaced. More...

static bool	lh__have_border (enum box_side side, const css_computed_style *style)
	Layout helper: Check for CSS border on given side. More...

static bool	lh__box_is_absolute (const struct box *b)

static bool	lh__flex_main_is_horizontal (const struct box *flex)

static bool	lh__flex_direction_reversed (const struct box *flex)

static int	lh__non_auto_margin (const struct box *b, enum box_side side)

static int	lh__delta_outer_height (const struct box *b)

static int	lh__delta_outer_width (const struct box *b)

static int	lh__delta_outer_main (const struct box flex, const struct box b)

static int	lh__delta_outer_cross (const struct box flex, const struct box b)

static int *	lh__box_size_main_ptr (bool horizontal, struct box *b)

static int *	lh__box_size_cross_ptr (bool horizontal, struct box *b)

static int	lh__box_size_main (bool horizontal, const struct box *b)

static int	lh__box_size_cross (bool horizontal, const struct box *b)

static bool	lh__box_size_cross_is_auto (bool horizontal, struct box *b)

static enum css_align_self_e	lh__box_align_self (const struct box flex, const struct box item)

static void	calculate_mbp_width (const css_unit_ctx unit_len_ctx, const css_computed_style style, unsigned int side, bool margin, bool border, bool padding, int fixed, float frac)
	Determine width of margin, borders, and padding on one side of a box. More...

static void	layout_handle_box_sizing (const css_unit_ctx unit_len_ctx, const struct box box, int available_width, bool setwidth, int *dimension)
	Adjust a specified width or height for the box-sizing property. More...

static void	layout_find_dimensions (const css_unit_ctx unit_len_ctx, int available_width, int viewport_height, const struct box box, const css_computed_style style, int width, int height, int max_width, int min_width, int max_height, int *min_height, int margin[4], int padding[4], struct box_border border[4])
	Calculate width, height, and thickness of margins, paddings, and borders. More...

Variables
const css_len_func	margin_funcs [4]
	Array of per-side access functions for computed style margins. More...

const css_len_func	padding_funcs [4]
	Array of per-side access functions for computed style paddings. More...

const css_len_func	border_width_funcs [4]
	Array of per-side access functions for computed style border_widths. More...

const css_border_style_func	border_style_funcs [4]
	Array of per-side access functions for computed style border styles. More...

const css_border_color_func	border_color_funcs [4]
	Array of per-side access functions for computed style border colors. More...

Detailed Description

HTML layout private interface.

Definition in file layout_internal.h.

Macro Definition Documentation

◆ AUTO

#define AUTO INT_MIN

Definition at line 27 of file layout_internal.h.

Typedef Documentation

◆ css_border_color_func

typedef uint8_t(* css_border_color_func) (const css_computed_style *style, css_color *color)

Definition at line 76 of file layout_internal.h.

◆ css_border_style_func

typedef uint8_t(* css_border_style_func) (const css_computed_style *style)

Definition at line 74 of file layout_internal.h.

◆ css_len_func

typedef uint8_t(* css_len_func) (const css_computed_style *style, css_fixed *length, css_unit *unit)

Definition at line 71 of file layout_internal.h.

Function Documentation

◆ calculate_mbp_width()

static void calculate_mbp_width	(	const css_unit_ctx *	unit_len_ctx,
		const css_computed_style *	style,
		unsigned int	side,
		bool	margin,
		bool	border,
		bool	padding,
		int *	fixed,
		float *	frac
	)

inlinestatic

Determine width of margin, borders, and padding on one side of a box.

Parameters

unit_len_ctx	CSS length conversion context for document
style	style to measure
side	side of box to measure
margin	whether margin width is required
border	whether border width is required
padding	whether padding width is required
fixed	increased by sum of fixed margin, border, and padding
frac	increased by sum of fractional margin and padding

Definition at line 313 of file layout_internal.h.

References border_width_funcs, lh__have_border(), margin_funcs, padding_funcs, and type.

Referenced by layout_float_find_dimensions(), layout_handle_box_sizing(), layout_minmax_block(), layout_minmax_line(), and layout_minmax_table().

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◆ layout_block_context()

bool layout_block_context	(	struct box *	block,
		int	viewport_height,
		html_content *	content
	)

Layout a block formatting context.

Parameters

block	BLOCK, INLINE_BLOCK, or TABLE_CELL to layout
viewport_height	Height of viewport in pixels or -ve if unknown
content	Memory pool for any new boxes

Returns: true on success, false on memory exhaustion

This function carries out layout of a block and its children, as described in CSS 2.1 9.4.1.

< current coordinates

Definition at line 3508 of file layout.c.

References AUTO, plot_font_style::background, box::border, BOTTOM, BOX_BLOCK, BOX_FLEX, BOX_INLINE_BLOCK, BOX_INLINE_CONTAINER, BOX_INLINE_FLEX, box_is_first_child(), BOX_TABLE, BOX_TABLE_CELL, box::cached_place_below_level, box::children, box::clear_level, form_control::data, find_sides(), box::flags, box::float_children, font_plot_style_from_css(), box::gadget, GADGET_CHECKBOX, GADGET_PASSWORD, GADGET_RADIO, GADGET_TEXTAREA, GADGET_TEXTBOX, HAS_HEIGHT, box::height, IFRAME, box::iframe, layout_apply_minmax_height(), layout_block_add_scrollbar(), layout_block_context(), layout_block_find_dimensions(), layout_block_object(), layout_clear(), layout_flex(), layout_get_object_dimensions(), layout_inline_container(), layout_next_margin_block(), layout_solve_width(), layout_table(), LEFT, lh__box_is_object(), MAKE_HEIGHT, box::margin, box::next, box::next_float, NS_TRANSPARENT, NSLOG, box::object, box::padding, box::parent, REPLACE_DIM, RIGHT, box::style, textarea_set_layout(), TOP, box::type, form_control::type, UNKNOWN_WIDTH, box_border::width, box::width, width, box::x, and box::y.

Referenced by layout_absolute(), layout_block_context(), layout_document(), layout_flex_item(), layout_float(), and layout_table().

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◆ layout_find_dimensions()

static void layout_find_dimensions	(	const css_unit_ctx *	unit_len_ctx,
		int	available_width,
		int	viewport_height,
		const struct box *	box,
		const css_computed_style *	style,
		int *	width,
		int *	height,
		int *	max_width,
		int *	min_width,
		int *	max_height,
		int *	min_height,
		int	margin[4],
		int	padding[4],
		struct box_border	border[4]
	)

inlinestatic

Calculate width, height, and thickness of margins, paddings, and borders.

Parameters

unit_len_ctx	Length conversion context
available_width	width of containing block
viewport_height	height of viewport in pixels or -ve if unknown
box	current box
style	style giving width, height, margins, paddings, and borders
width	updated to width, may be NULL
height	updated to height, may be NULL
max_width	updated to max-width, may be NULL
min_width	updated to min-width, may be NULL
max_height	updated to max-height, may be NULL
min_height	updated to min-height, may be NULL
margin	filled with margins, may be NULL
padding	filled with paddings, may be NULL
border	filled with border widths, may be NULL

Definition at line 430 of file layout_internal.h.

References AUTO, border_color_funcs, border_style_funcs, border_width_funcs, BOX_INLINE_CONTAINER, BOX_TABLE, BOX_TABLE_CELL, BOX_TABLE_ROW, BOX_TABLE_ROW_GROUP, border::c, box::float_container, box::height, height, layout_handle_box_sizing(), box::margin, margin_funcs, box::max_width, box::min_width, ns_computed_min_height(), ns_computed_min_width(), box::padding, padding_funcs, box::parent, box::style, border::style, box::type, type, border::width, and width.

Referenced by layout_absolute(), layout_block_find_dimensions(), layout_flex(), layout_flex_ctx__populate_item_data(), layout_float_find_dimensions(), layout_line(), layout_next_margin_block(), and layout_table().

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◆ layout_flex()

bool layout_flex	(	struct box *	flex,
		int	available_width,
		html_content *	content
	)

Layout a flex container.

Parameters

[in]	flex	table to layout
[in]	available_width	width of containing block
[in]	content	memory pool for any new boxes

Returns: true on success, false on memory exhaustion

Definition at line 1046 of file layout_flex.c.

References AUTO, flex_ctx::available_cross, flex_ctx::available_main, box::border, flex_ctx::cross_size, flex_ctx::flex, box::height, flex_ctx::horizontal, layout_find_dimensions(), layout_flex__collect_items_into_lines(), layout_flex__place_lines(), layout_flex_ctx__create(), layout_flex_ctx__destroy(), layout_flex_ctx__populate_item_data(), flex_ctx::main_size, box::margin, min, NSLOG, box::padding, box::style, flex_ctx::unit_len_ctx, and box::width.

Referenced by layout_absolute(), layout_block_context(), layout_flex_item(), and layout_float().

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◆ layout_handle_box_sizing()

static void layout_handle_box_sizing	(	const css_unit_ctx *	unit_len_ctx,
		const struct box *	box,
		int	available_width,
		bool	setwidth,
		int *	dimension
	)

inlinestatic

Adjust a specified width or height for the box-sizing property.

This turns the specified dimension into a content-box dimension.

Parameters

unit_len_ctx	Length conversion context
box	gadget to adjust dimensions of
available_width	width of containing block
setwidth	set true if the dimension to be tweaked is a width, else set false for a height
dimension	current value for given width/height dimension. updated to new value after consideration of gadget properties.

Definition at line 382 of file layout_internal.h.

References BOTTOM, calculate_mbp_width(), LEFT, RIGHT, box::style, and TOP.

Referenced by layout_find_dimensions().

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◆ layout_table()

bool layout_table	(	struct box *	table,
		int	available_width,
		html_content *	content
	)

Layout a table.

Parameters

table	table to layout
available_width	width of containing block
content	memory pool for any new boxes

Returns: true on success, false on memory exhaustion

Todo:: distribute spare height over the row groups / rows / cells

Definition at line 1591 of file layout.c.

References AUTO, box::border, BOTTOM, BOX_INLINE_CONTAINER, BOX_TABLE, box::cached_place_below_level, box::children, box::col, column::COLUMN_WIDTH_FIXED, column::COLUMN_WIDTH_PERCENT, column::COLUMN_WIDTH_RELATIVE, box::columns, count(), box::descendant_y0, box::descendant_y1, box::float_children, box::float_container, box::height, layout_block_context(), layout_find_dimensions(), layout_move_children(), LEFT, box::margin, column::max, max, box::max_width, column::min, min, box::min_width, box::next, NSLOG, box::padding, box::parent, column::positioned, RIGHT, box::rows, SCROLLBAR_WIDTH, box::start_column, box::style, table_used_border_for_cell(), TOP, column::type, box::type, type, box_border::width, column::width, box::width, width, box::x, and box::y.

Referenced by layout_absolute(), layout_block_context(), and layout_float().

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◆ lh__box_align_self()

static enum css_align_self_e lh__box_align_self	(	const struct box *	flex,
		const struct box *	item
	)

inlinestatic

Definition at line 288 of file layout_internal.h.

References box::style.

Referenced by layout_flex__place_line_items_cross().

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◆ lh__box_is_absolute()

static bool lh__box_is_absolute ( const struct box * b )

inlinestatic

Definition at line 161 of file layout_internal.h.

References box::style.

Referenced by layout_flex__build_line(), layout_flex__item_freeze(), and layout_flex__place_line_items_main().

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◆ lh__box_is_flex_container()

static bool lh__box_is_flex_container ( const struct box * b )

inlinestatic

Layout helper: Check whether box takes part in inline flow.

Definition at line 113 of file layout_internal.h.

References BOX_FLEX, BOX_INLINE_FLEX, and box::type.

Referenced by layout_minmax_block(), and lh__box_is_flex_item().

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◆ lh__box_is_flex_item()

static bool lh__box_is_flex_item ( const struct box * b )

inlinestatic

Layout helper: Check whether box takes part in inline flow.

Definition at line 120 of file layout_internal.h.

References lh__box_is_flex_container(), and box::parent.

Referenced by layout_minmax_block().

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◆ lh__box_is_float_box()

static bool lh__box_is_float_box ( const struct box * b )

inlinestatic

Layout helper: Check whether box is a float.

Definition at line 96 of file layout_internal.h.

References BOX_FLOAT_LEFT, BOX_FLOAT_RIGHT, and box::type.

Referenced by layout_line(), layout_minmax_block(), layout_minmax_line(), and lh__box_is_inline_content().

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◆ lh__box_is_inline_content()

static bool lh__box_is_inline_content ( const struct box * b )

inlinestatic

Layout helper: Check whether box is inline level.

(Includes BR, floats.)

Definition at line 133 of file layout_internal.h.

References lh__box_is_float_box(), and lh__box_is_inline_level().

Referenced by layout_line(), and layout_minmax_line().

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◆ lh__box_is_inline_flow()

static bool lh__box_is_inline_flow ( const struct box * b )

inlinestatic

Layout helper: Check whether box takes part in inline flow.

Definition at line 103 of file layout_internal.h.

References BOX_INLINE, BOX_INLINE_BLOCK, BOX_INLINE_END, BOX_INLINE_FLEX, BOX_TEXT, and box::type.

Referenced by layout_line(), and lh__box_is_inline_level().

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◆ lh__box_is_inline_level()

static bool lh__box_is_inline_level ( const struct box * b )

inlinestatic

Layout helper: Check whether box is inline level.

(Includes BR.)

Definition at line 126 of file layout_internal.h.

References BOX_BR, lh__box_is_inline_flow(), and box::type.

Referenced by lh__box_is_inline_content().

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◆ lh__box_is_object()

static bool lh__box_is_object ( const struct box * b )

inlinestatic

Layout helper: Check whether box is an object.

Definition at line 140 of file layout_internal.h.

References box::flags, IFRAME, box::object, and REPLACE_DIM.

Referenced by layout_block_context(), layout_inline_container(), and lh__box_is_replace().

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◆ lh__box_is_replace()

static bool lh__box_is_replace ( const struct box * b )

inlinestatic

Layout helper: Check whether box is replaced.

Definition at line 147 of file layout_internal.h.

References box::gadget, and lh__box_is_object().

Referenced by layout_line(), and layout_minmax_line().

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◆ lh__box_size_cross()

static int lh__box_size_cross	(	bool	horizontal,
		const struct box *	b
	)

inlinestatic

Definition at line 265 of file layout_internal.h.

References box::height, and box::width.

Referenced by layout_flex__place_line_items_main().

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◆ lh__box_size_cross_is_auto()

static bool lh__box_size_cross_is_auto	(	bool	horizontal,
		struct box *	b
	)

inlinestatic

Definition at line 272 of file layout_internal.h.

References box::style.

Referenced by layout_flex__place_line_items_cross().

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◆ lh__box_size_cross_ptr()

static int * lh__box_size_cross_ptr	(	bool	horizontal,
		struct box *	b
	)

inlinestatic

Definition at line 251 of file layout_internal.h.

References box::height, and box::width.

Referenced by layout_flex__place_line_items_cross().

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◆ lh__box_size_main()

static int lh__box_size_main	(	bool	horizontal,
		const struct box *	b
	)

inlinestatic

Definition at line 258 of file layout_internal.h.

References box::height, and box::width.

Referenced by layout_flex__place_line_items_main().

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◆ lh__box_size_main_ptr()

static int * lh__box_size_main_ptr	(	bool	horizontal,
		struct box *	b
	)

inlinestatic

Definition at line 244 of file layout_internal.h.

References box::height, and box::width.

◆ lh__delta_outer_cross()

static int lh__delta_outer_cross	(	const struct box *	flex,
		const struct box *	b
	)

inlinestatic

Definition at line 233 of file layout_internal.h.

References lh__delta_outer_height(), lh__delta_outer_width(), and lh__flex_main_is_horizontal().

Referenced by layout_flex__place_line_items_cross(), and layout_flex__place_line_items_main().

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◆ lh__delta_outer_height()

static int lh__delta_outer_height ( const struct box * b )

inlinestatic

Definition at line 202 of file layout_internal.h.

References box::border, BOTTOM, lh__non_auto_margin(), box::padding, TOP, and box_border::width.

Referenced by lh__delta_outer_cross(), and lh__delta_outer_main().

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◆ lh__delta_outer_main()

static int lh__delta_outer_main	(	const struct box *	flex,
		const struct box *	b
	)

inlinestatic

Definition at line 222 of file layout_internal.h.

References lh__delta_outer_height(), lh__delta_outer_width(), and lh__flex_main_is_horizontal().

Referenced by layout_flex__base_and_main_sizes(), layout_flex__build_line(), and layout_flex__place_line_items_main().

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◆ lh__delta_outer_width()

static int lh__delta_outer_width ( const struct box * b )

inlinestatic

Definition at line 212 of file layout_internal.h.

References box::border, LEFT, lh__non_auto_margin(), box::padding, RIGHT, and box_border::width.

Referenced by layout_flex__base_and_main_sizes(), layout_flex__place_line_items_main(), lh__delta_outer_cross(), and lh__delta_outer_main().

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◆ lh__flex_direction_reversed()

static bool lh__flex_direction_reversed ( const struct box * flex )

inlinestatic

Definition at line 184 of file layout_internal.h.

References box::style.

Referenced by layout_flex_ctx__create().

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◆ lh__flex_main_is_horizontal()

static bool lh__flex_main_is_horizontal ( const struct box * flex )

inlinestatic

Definition at line 167 of file layout_internal.h.

References box::style.

Referenced by layout_flex_ctx__create(), layout_minmax_block(), lh__delta_outer_cross(), and lh__delta_outer_main().

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◆ lh__have_border()

static bool lh__have_border	(	enum box_side	side,
		const css_computed_style *	style
	)

inlinestatic

Layout helper: Check for CSS border on given side.

Definition at line 154 of file layout_internal.h.

References border_style_funcs.

Referenced by calculate_mbp_width().

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◆ lh__non_auto_margin()

static int lh__non_auto_margin	(	const struct box *	b,
		enum box_side	side
	)

inlinestatic

Definition at line 197 of file layout_internal.h.

References AUTO, and box::margin.

Referenced by layout_flex__place_line_items_cross(), layout_flex__place_line_items_main(), lh__delta_outer_height(), and lh__delta_outer_width().

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Variable Documentation

◆ border_color_funcs

const css_border_color_func border_color_funcs[4]

extern

Array of per-side access functions for computed style border colors.

Definition at line 106 of file layout.c.

Referenced by layout_find_dimensions().

◆ border_style_funcs

const css_border_style_func border_style_funcs[4]

extern

Array of per-side access functions for computed style border styles.

Definition at line 98 of file layout.c.

Referenced by layout_find_dimensions(), and lh__have_border().

◆ border_width_funcs

const css_len_func border_width_funcs[4]

extern

Array of per-side access functions for computed style border_widths.

Definition at line 90 of file layout.c.

Referenced by calculate_mbp_width(), and layout_find_dimensions().

◆ margin_funcs

const css_len_func margin_funcs[4]

extern

Array of per-side access functions for computed style margins.

Definition at line 74 of file layout.c.

Referenced by calculate_mbp_width(), and layout_find_dimensions().

◆ padding_funcs

const css_len_func padding_funcs[4]

extern

Array of per-side access functions for computed style paddings.

Definition at line 82 of file layout.c.

Referenced by calculate_mbp_width(), and layout_find_dimensions().

Macros

Typedefs

Functions

Variables

Detailed Description

Macro Definition Documentation

◆ AUTO

Typedef Documentation

◆ css_border_color_func

◆ css_border_style_func

◆ css_len_func

Function Documentation

◆ calculate_mbp_width()

◆ layout_block_context()

◆ layout_find_dimensions()

◆ layout_flex()

◆ layout_handle_box_sizing()

◆ layout_table()

◆ lh__box_align_self()

◆ lh__box_is_absolute()

◆ lh__box_is_flex_container()

◆ lh__box_is_flex_item()

◆ lh__box_is_float_box()

◆ lh__box_is_inline_content()

◆ lh__box_is_inline_flow()

◆ lh__box_is_inline_level()

◆ lh__box_is_object()

◆ lh__box_is_replace()

◆ lh__box_size_cross()

◆ lh__box_size_cross_is_auto()

◆ lh__box_size_cross_ptr()

◆ lh__box_size_main()

◆ lh__box_size_main_ptr()

◆ lh__delta_outer_cross()

◆ lh__delta_outer_height()

◆ lh__delta_outer_main()

◆ lh__delta_outer_width()

◆ lh__flex_direction_reversed()

◆ lh__flex_main_is_horizontal()

◆ lh__have_border()

◆ lh__non_auto_margin()

Variable Documentation

◆ border_color_funcs

◆ border_style_funcs

◆ border_width_funcs

◆ margin_funcs

◆ padding_funcs