HTML layout implementation. More...

#include <assert.h>
#include <limits.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <dom/dom.h>
#include "utils/log.h"
#include "utils/talloc.h"
#include "utils/utils.h"
#include "utils/nsoption.h"
#include "utils/corestrings.h"
#include "utils/nsurl.h"
#include "netsurf/inttypes.h"
#include "netsurf/content.h"
#include "netsurf/browser_window.h"
#include "netsurf/layout.h"
#include "content/content.h"
#include "content/content_protected.h"
#include "css/utils.h"
#include "desktop/scrollbar.h"
#include "desktop/textarea.h"
#include "html/html.h"
#include "html/html_save.h"
#include "html/private.h"
#include "html/box.h"
#include "html/box_inspect.h"
#include "html/font.h"
#include "html/form_internal.h"
#include "html/layout.h"
#include "html/layout_internal.h"
#include "html/table.h"

Include dependency graph for layout.c:

Functions
static void	layout_minmax_block (struct box block, const struct gui_layout_table font_func, const html_content *content)
	Calculate minimum and maximum width of a block. More...

static void	layout_get_object_dimensions (struct box box, int width, int *height, int min_width, int max_width, int min_height, int max_height)
	Compute the size of replaced boxes with auto dimensions, according to content. More...

static int	layout_text_indent (const css_unit_ctx unit_len_ctx, const css_computed_style style, int width)
	Calculate the text-indent length. More...

static void	layout_minmax_table (struct box table, const struct gui_layout_table font_func, const html_content *content)
	Calculate minimum and maximum width of a table. More...

static bool	box_has_percentage_max_width (struct box *b)
	Helper to check if a box has percentage max width. More...

static struct box *	layout_minmax_line (struct box first, int line_min, int line_max, bool first_line, bool line_has_height, const struct gui_layout_table font_func, const html_content content)
	Calculate minimum and maximum width of a line. More...

static void	layout_minmax_inline_container (struct box inline_container, bool has_height, const struct gui_layout_table font_func, const html_content content)
	Calculate minimum and maximum width of an inline container. More...

static struct box *	layout_next_margin_block (const css_unit_ctx unit_len_ctx, struct box box, struct box block, int viewport_height, int max_pos_margin, int *max_neg_margin)
	Find next block that current margin collapses to. More...

static int	layout_clear (struct box *fl, enum css_clear_e clear)
	Find y coordinate which clears all floats on left and/or right. More...

static void	find_sides (struct box fl, int y0, int y1, int x0, int x1, struct box left, struct box *right)
	Find left and right edges in a vertical range. More...

static int	layout_solve_width (struct box *box, int available_width, int width, int lm, int rm, int max_width, int min_width)
	Solve the width constraint as given in CSS 2.1 section 10.3.3. More...

static void	layout_block_find_dimensions (const css_unit_ctx unit_len_ctx, int available_width, int viewport_height, int lm, int rm, struct box box)
	Compute dimensions of box, margins, paddings, and borders for a block-level element. More...

static void	layout_block_add_scrollbar (struct box *box, int which)
	Manipulate a block's [RB]padding/height/width to accommodate scrollbars. More...

static void	layout_move_children (struct box *box, int x, int y)
	Moves the children of a box by a specified amount. More...

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

static bool	layout_apply_minmax_height (const css_unit_ctx unit_len_ctx, struct box box, struct box *container)
	Manimpulate box height according to CSS min-height and max-height properties. More...

static bool	layout_block_object (struct box *block)
	Layout a block which contains an object. More...

static void	add_float_to_container (struct box cont, struct box b)
	Insert a float into a container. More...

static bool	layout_text_box_split (html_content content, plot_font_style_t fstyle, struct box *split_box, size_t new_length, int new_width)
	Split a text box. More...

static void	layout_float_find_dimensions (const css_unit_ctx unit_len_ctx, int available_width, const css_computed_style style, struct box *box)
	Compute dimensions of box, margins, paddings, and borders for a floating element using shrink-to-fit. More...

static bool	layout_float (struct box b, int width, html_content content)
	Layout the contents of a float or inline block. More...

static void	place_float_below (struct box c, int width, int cx, int y, struct box cont)
	Position a float in the first available space. More...

static int	line_height (const css_unit_ctx unit_len_ctx, const css_computed_style style)
	Calculate line height from a style. More...

static bool	layout_line (struct box first, int width, int y, int cx, int cy, struct box cont, bool indent, bool has_text_children, html_content content, struct box *next_box)
	Position a line of boxes in inline formatting context. More...

static bool	layout_inline_container (struct box inline_container, int width, struct box cont, int cx, int cy, html_content *content)
	Layout lines of text or inline boxes with floats. More...

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

static bool	layout__get_element_tag (const dom_node node, dom_html_element_type type)
	Get a dom node's element tag type. More...

static bool	layout__check_element_type (const dom_node *node, dom_html_element_type type)
	Check a node's tag type. More...

static bool	layout__get_li_value (dom_node li_node, dom_long value_out)
	Helper to get attribute value from a LI node. More...

static bool	layout__get_ol_start (dom_node ol_node, dom_long start_out)
	Helper to get start attribute value from a OL node. More...

static bool	layout__get_ol_reversed (dom_node *ol_node)
	Helper to get reversed attribute value from a OL node. More...

static bool	layout__get_list_item_count (dom_node list_owner, dom_long count_out)
	Get the number of list items for a list owner. More...

static void	layout__ordered_list_count (struct box *box)
	Handle list item counting, if this is a list owner box. More...

static void	layout__set_numerical_marker_text (const html_content content, struct box box)
	Set up the marker text for a numerical list item. More...

static bool	layout__list_item_is_numerical (const struct box *b)
	Find out if box's style represents a numerical list style type. More...

static void	layout_lists (const html_content content, struct box box)
	Layout list markers. More...

static void	layout_compute_offsets (const css_unit_ctx unit_len_ctx, struct box box, struct box containing_block, int top, int right, int bottom, int *left)
	Compute box offsets for a relatively or absolutely positioned box with respect to a box. More...

static bool	layout_absolute (struct box box, struct box containing_block, int cx, int cy, html_content *content)
	Layout and position an absolutely positioned box. More...

static bool	layout_position_absolute (struct box box, struct box containing_block, int cx, int cy, html_content *content)
	Recursively layout and position absolutely positioned boxes. More...

static void	layout_compute_relative_offset (const css_unit_ctx unit_len_ctx, struct box box, int x, int y)
	Compute a box's relative offset as per CSS 2.1 9.4.3. More...

static void	layout_position_relative (const css_unit_ctx unit_len_ctx, struct box root, struct box *fp, int fx, int fy)
	Adjust positions of relatively positioned boxes. More...

static void	layout_get_box_bbox (const css_unit_ctx unit_len_ctx, struct box box, int desc_x0, int desc_y0, int desc_x1, int desc_y1)
	Find a box's bounding box relative to itself, i.e. More...

static void	layout_update_descendant_bbox (const css_unit_ctx unit_len_ctx, struct box box, struct box *child, int off_x, int off_y)
	Apply changes to box descendant_[xy][01] values due to given child. More...

static void	layout_calculate_descendant_bboxes (const css_unit_ctx unit_len_ctx, struct box box)
	Recursively calculate the descendant_[xy][01] values for a laid-out box tree and inform iframe browser windows of their size and position. More...

bool	layout_document (html_content *content, int width, int height)
	Calculate positions of boxes in a document. 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 implementation.

Layout is carried out in two stages:

+ calculation of minimum / maximum box widths, and
- determination of whether block level boxes will have >zero height
+ layout (position and dimensions)

In most cases the functions for the two stages are a corresponding pair layout_minmax_X() and layout_X().

Definition in file layout.c.

Function Documentation

◆ add_float_to_container()

static void add_float_to_container	(	struct box *	cont,
		struct box *	b
	)

static

Insert a float into a container.

Parameters

cont	block formatting context block, used to contain float
b	box to add to float

This sorts floats in order of descending bottom edges.

Definition at line 2305 of file layout.c.

References BOX_FLOAT_LEFT, BOX_FLOAT_RIGHT, box::float_children, box::height, box::next_float, box::prev, box::type, and box::y.

Referenced by layout_line().

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◆ box_has_percentage_max_width()

static bool box_has_percentage_max_width ( struct box * b )

inlinestatic

Helper to check if a box has percentage max width.

Parameters

[in] b Box to check.

Returns: true iff box has percnetage max width.

Definition at line 438 of file layout.c.

References box::style, and type.

Referenced by layout_minmax_line().

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◆ find_sides()

static void find_sides	(	struct box *	fl,
		int	y0,
		int	y1,
		int *	x0,
		int *	x1,
		struct box **	left,
		struct box **	right
	)

static

Find left and right edges in a vertical range.

Parameters

fl	first float in float list
y0	start of y range to search
y1	end of y range to search
x0	start left edge, updated to available left edge
x1	start right edge, updated to available right edge
left	returns float on left if present
right	returns float on right if present

Definition at line 1285 of file layout.c.

References BOX_FLOAT_LEFT, box::height, box::next_float, NSLOG, box::type, box::width, box::x, and box::y.

Referenced by layout_block_context(), layout_line(), and place_float_below().

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◆ layout__check_element_type()

static bool layout__check_element_type	(	const dom_node *	node,
		dom_html_element_type	type
	)

inlinestatic

Check a node's tag type.

Parameters

[in]	node	Node to check tag type of.
[in]	type	Tag type to test for.

Returns: true if if node has given type, false otherwise.

Definition at line 4050 of file layout.c.

References layout__get_element_tag(), box::node, and type.

Referenced by layout__get_list_item_count(), and layout__ordered_list_count().

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◆ layout__get_element_tag()

static bool layout__get_element_tag	(	const dom_node *	node,
		dom_html_element_type *	type
	)

static

Get a dom node's element tag type.

Parameters

[in]	node	Node to get tag type of.
[in]	type	Returns element tag type on success.

Returns: true if on success, false otherwise.

Definition at line 4018 of file layout.c.

References box::node, and type.

Referenced by layout__check_element_type(), layout__get_list_item_count(), and layout__ordered_list_count().

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◆ layout__get_li_value()

static bool layout__get_li_value	(	dom_node *	li_node,
		dom_long *	value_out
	)

static

Helper to get attribute value from a LI node.

Parameters

[in]	li_node	DOM node for the LI element;
[out]	value_out	Returns the value on success.

Returns: true if node has value, otherwise false.

Todo:: dom_html_li_element_get_value() is rubbish and we can't tell a lack of value attribute or invalid value from a perfectly valid '-1'.

This helps for the common case of no value. However we should fix libdom to have some kind of sane interface to get numerical attributes.

Definition at line 4072 of file layout.c.

Referenced by layout__ordered_list_count().

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◆ layout__get_list_item_count()

static bool layout__get_list_item_count	(	dom_node *	list_owner,
		dom_long *	count_out
	)

static

Get the number of list items for a list owner.

Parameters

[in]	list_owner	DOM node to count list items for.
[in]	count_out	Returns list item count on success.

Returns: true on success, otherwise false.

Definition at line 4173 of file layout.c.

References count(), layout__check_element_type(), layout__get_element_tag(), and box::list_marker.

Referenced by layout__ordered_list_count().

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◆ layout__get_ol_reversed()

static bool layout__get_ol_reversed ( dom_node * ol_node )

static

Helper to get reversed attribute value from a OL node.

Parameters

[in] ol_node DOM node for the OL element;

Returns: true if node has reversed, otherwise false.

Definition at line 4149 of file layout.c.

Referenced by layout__ordered_list_count().

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◆ layout__get_ol_start()

static bool layout__get_ol_start	(	dom_node *	ol_node,
		dom_long *	start_out
	)

static

Helper to get start attribute value from a OL node.

Parameters

[in]	ol_node	DOM node for the OL element;
[out]	start_out	Returns the value on success.

Returns: true if node has value, otherwise false.

Todo:: see layout__get_li_value().

Definition at line 4114 of file layout.c.

Referenced by layout__ordered_list_count().

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◆ layout__list_item_is_numerical()

static bool layout__list_item_is_numerical ( const struct box * b )

static

Find out if box's style represents a numerical list style type.

Parameters

[in] b Box with style to test.

Returns: true if box has numerical list style type, false otherwise.

Definition at line 4375 of file layout.c.

References box::style.

Referenced by layout_lists().

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◆ layout__ordered_list_count()

static void layout__ordered_list_count ( struct box * box )

static

Handle list item counting, if this is a list owner box.

Parameters

[in] box Box to do list item counting for.

Definition at line 4239 of file layout.c.

References layout__check_element_type(), layout__get_element_tag(), layout__get_li_value(), layout__get_list_item_count(), layout__get_ol_reversed(), layout__get_ol_start(), box::list_marker, box::list_value, box::next, and box::node.

Referenced by layout_lists().

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◆ layout__set_numerical_marker_text()

static void layout__set_numerical_marker_text	(	const html_content *	content,
		struct box *	box
	)

static

Set up the marker text for a numerical list item.

Parameters

[in]	content	The HTML content.
[in]	box	The list item's main box.

initial length of a list marker buffer

enough for 9,999,999,999,999,999,999 in decimal or five characters for 4-byte UTF-8.

Definition at line 4325 of file layout.c.

References box::length, box::list_marker, box::list_value, box::style, talloc_array, talloc_realloc, and box::text.

Referenced by layout_lists().

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◆ layout_absolute()

static bool layout_absolute	(	struct box *	box,
		struct box *	containing_block,
		int	cx,
		int	cy,
		html_content *	content
	)

static

Layout and position an absolutely positioned box.

Parameters

box	absolute box to layout and position
containing_block	containing block
cx	position of box relative to containing_block
cy	position of box relative to containing_block
content	memory pool for any new boxes

Returns: true on success, false on memory exhaustion

Todo:: inline ancestors

Todo:: Inline ancestors

Definition at line 4558 of file layout.c.

References AUTO, box::border, BOTTOM, BOX_BLOCK, BOX_FLEX, BOX_INLINE_BLOCK, BOX_INLINE_FLEX, BOX_TABLE, BOX_TABLE_CELL, box::flags, box::float_container, box::height, height, IFRAME, layout_apply_minmax_height(), layout_block_context(), layout_compute_offsets(), layout_find_dimensions(), layout_flex(), layout_solve_width(), layout_table(), LEFT, box::margin, max, box::max_width, min, box::min_width, NSLOG, box::object, box::padding, box::parent, RIGHT, box::style, TOP, box::type, box_border::width, box::width, border::width, width, box::x, and box::y.

Referenced by layout_position_absolute().

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◆ layout_apply_minmax_height()

static bool layout_apply_minmax_height	(	const css_unit_ctx *	unit_len_ctx,
		struct box *	box,
		struct box *	container
	)

static

Manimpulate box height according to CSS min-height and max-height properties.

Parameters

unit_len_ctx	CSS length conversion context for document.
box	block to modify with any min-height or max-height
container	containing block for absolutely positioned elements, or NULL for non absolutely positioned elements.

Returns: whether the height has been changed

Definition at line 2158 of file layout.c.

References AUTO, BOX_INLINE_CONTAINER, box::float_container, box::height, height, ns_computed_min_height(), box::parent, box::style, and box::type.

Referenced by layout_absolute(), and layout_block_context().

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◆ layout_block_add_scrollbar()

static void layout_block_add_scrollbar	(	struct box *	box,
		int	which
	)

static

Manipulate a block's [RB]padding/height/width to accommodate scrollbars.

Parameters

box	Box to apply scrollbar space too. Must be BOX_BLOCK.
which	Which scrollbar to make space for. Must be RIGHT or BOTTOM.

Definition at line 1526 of file layout.c.

References AUTO, BOTTOM, BOX_BLOCK, box_hscrollbar_present(), box_vscrollbar_present(), content_get_type(), CONTENT_HTML, box::height, height, box::object, box::padding, RIGHT, SCROLLBAR_WIDTH, box::style, box::type, and box::width.

Referenced by layout_block_context().

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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_block_find_dimensions()

static void layout_block_find_dimensions	(	const css_unit_ctx *	unit_len_ctx,
		int	available_width,
		int	viewport_height,
		int	lm,
		int	rm,
		struct box *	box
	)

static

Compute dimensions of box, margins, paddings, and borders for a block-level element.

Parameters

unit_len_ctx	Length conversion context
available_width	Max width available in pixels
viewport_height	Height of viewport in pixels or -ve if unknown
lm	min left margin required to avoid floats in px. zero if not applicable
rm	min right margin required to avoid floats in px. zero if not applicable
box	box to find dimensions of. updated with new width, height, margins, borders and paddings

See CSS 2.1 10.3.3, 10.3.4, 10.6.2, and 10.6.3.

Definition at line 1484 of file layout.c.

References AUTO, box::border, BOTTOM, content_get_type(), CONTENT_HTML, box::flags, box::height, height, layout_find_dimensions(), layout_get_object_dimensions(), layout_solve_width(), box::margin, box::max_width, box::min_width, box::object, box::padding, REPLACE_DIM, box_border::style, box::style, TOP, box::width, and width.

Referenced by layout_block_context(), and layout_document().

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◆ layout_block_object()

static bool layout_block_object ( struct box * block )

static

Layout a block which contains an object.

Parameters

block box of type BLOCK, INLINE_BLOCK, TABLE, or TABLE_CELL

Returns: true on success, false on memory exhaustion

Definition at line 2271 of file layout.c.

References BOX_BLOCK, BOX_FLEX, BOX_INLINE_BLOCK, BOX_INLINE_FLEX, BOX_TABLE, BOX_TABLE_CELL, content_can_reformat(), content_reformat(), hlcache_handle_get_url(), NSLOG, box::object, box::type, and box::width.

Referenced by layout_block_context().

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◆ layout_calculate_descendant_bboxes()

static void layout_calculate_descendant_bboxes	(	const css_unit_ctx *	unit_len_ctx,
		struct box *	box
	)

static

Recursively calculate the descendant_[xy][01] values for a laid-out box tree and inform iframe browser windows of their size and position.

Parameters

unit_len_ctx	Length conversion context
box	tree of boxes to update

Definition at line 5303 of file layout.c.

References AUTO, box_coords(), BOX_FLOAT_LEFT, BOX_FLOAT_RIGHT, BOX_INLINE, BOX_INLINE_END, BOX_TEXT, browser_window_reformat(), browser_window_set_dimensions(), browser_window_set_position(), box::children, content_get_height(), content_get_type(), content_get_width(), CONTENT_HTML, box::descendant_x0, box::descendant_x1, box::descendant_y0, box::descendant_y1, box::flags, box::float_children, box::height, box::iframe, box::inline_end, layout_calculate_descendant_bboxes(), layout_get_box_bbox(), layout_update_descendant_bbox(), box::list_marker, box::next, box::next_float, box::object, REPLACE_DIM, box::style, box::type, UNKNOWN_WIDTH, box::width, box::x, and box::y.

Referenced by layout_calculate_descendant_bboxes(), and layout_document().

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◆ layout_clear()

static int layout_clear	(	struct box *	fl,
		enum css_clear_e	clear
	)

static

Find y coordinate which clears all floats on left and/or right.

Parameters

fl	first float in float list
clear	type of clear

Returns: y coordinate relative to ancestor box for floats

Definition at line 1256 of file layout.c.

References BOX_FLOAT_LEFT, BOX_FLOAT_RIGHT, box::height, box::next_float, box::type, and box::y.

Referenced by layout_block_context(), and layout_line().

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◆ layout_compute_offsets()

static void layout_compute_offsets	(	const css_unit_ctx *	unit_len_ctx,
		struct box *	box,
		struct box *	containing_block,
		int *	top,
		int *	right,
		int *	bottom,
		int *	left
	)

static

Compute box offsets for a relatively or absolutely positioned box with respect to a box.

Parameters

unit_len_ctx	Length conversion context
box	box to compute offsets for
containing_block	box to compute percentages with respect to
top	updated to top offset, or AUTO
right	updated to right offset, or AUTO
bottom	updated to bottom offset, or AUTO
left	updated to left offset, or AUTO

See CSS 2.1 9.3.2. containing_block must have width and height.

Definition at line 4469 of file layout.c.

References AUTO, box::height, box::style, type, UNKNOWN_WIDTH, and box::width.

Referenced by layout_absolute(), and layout_compute_relative_offset().

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◆ layout_compute_relative_offset()

static void layout_compute_relative_offset	(	const css_unit_ctx *	unit_len_ctx,
		struct box *	box,
		int *	x,
		int *	y
	)

static

Compute a box's relative offset as per CSS 2.1 9.4.3.

Parameters

unit_len_ctx	Length conversion context
box	Box to compute relative offsets for.
x	Receives relative offset in x.
y	Receives relative offset in y.

Definition at line 5011 of file layout.c.

References AUTO, box::float_container, layout_compute_offsets(), NSLOG, box::parent, box::style, box::x, and box::y.

Referenced by layout_position_relative().

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◆ layout_document()

bool layout_document	(	struct html_content *	content,
		int	width,
		int	height
	)

Calculate positions of boxes in a document.

Parameters

content	content of type CONTENT_HTML
width	available width
height	available height

Returns: true on success, false on memory exhaustion

Definition at line 5396 of file layout.c.

References box::border, BOTTOM, box::children, content_get_url(), box::height, height, layout_block_context(), layout_block_find_dimensions(), layout_calculate_descendant_bboxes(), layout_lists(), layout_minmax_block(), layout_position_absolute(), layout_position_relative(), LEFT, box::margin, NSLOG, nsurl_access(), box::padding, RIGHT, TOP, box_border::width, box::width, width, box::x, and box::y.

Referenced by html_reformat().

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◆ layout_float()

static bool layout_float	(	struct box *	b,
		int	width,
		html_content *	content
	)

static

Layout the contents of a float or inline block.

Parameters

b	float or inline block box
width	available width
content	memory pool for any new boxes

Returns: true on success, false on memory exhaustion

Definition at line 2569 of file layout.c.

References AUTO, BOTTOM, BOX_BLOCK, BOX_FLEX, BOX_INLINE_BLOCK, BOX_INLINE_FLEX, BOX_TABLE, layout_block_context(), layout_flex(), layout_float_find_dimensions(), layout_table(), LEFT, box::margin, RIGHT, box::style, TOP, box::type, and width.

Referenced by layout_line().

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◆ layout_float_find_dimensions()

static void layout_float_find_dimensions	(	const css_unit_ctx *	unit_len_ctx,
		int	available_width,
		const css_computed_style *	style,
		struct box *	box
	)

static

Compute dimensions of box, margins, paddings, and borders for a floating element using shrink-to-fit.

Also used for inline-blocks.

Parameters

unit_len_ctx	CSS length conversion context for document.
available_width	Max width available in pixels
style	Box's style
box	Box for which to find dimensions Box margins, borders, paddings, width and height are updated.

Definition at line 2431 of file layout.c.

References AUTO, box::border, BOTTOM, calculate_mbp_width(), content_get_type(), CONTENT_HTML, box::flags, box::gadget, GADGET_FILE, GADGET_PASSWORD, GADGET_TEXTAREA, GADGET_TEXTBOX, box::height, height, layout_find_dimensions(), layout_get_object_dimensions(), LEFT, box::margin, max, box::max_width, min, box::min_width, box::object, box::padding, REPLACE_DIM, RIGHT, SCROLLBAR_WIDTH, box_border::style, box::style, TOP, form_control::type, box_border::width, box::width, and width.

Referenced by layout_float().

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◆ layout_get_box_bbox()

static void layout_get_box_bbox	(	const css_unit_ctx *	unit_len_ctx,
		struct box *	box,
		int *	desc_x0,
		int *	desc_y0,
		int *	desc_x1,
		int *	desc_y1
	)

static

Find a box's bounding box relative to itself, i.e.

the box's border edge box

Parameters

unit_len_ctx	Length conversion context
box	box find bounding box of
desc_x0	updated to left of box's bbox
desc_y0	updated to top of box's bbox
desc_x1	updated to right of box's bbox
desc_y1	updated to bottom of box's bbox

Definition at line 5195 of file layout.c.

References box::border, BOTTOM, BOX_BLOCK, box::height, LEFT, box::object, box::padding, RIGHT, box::style, TOP, box::type, box_border::width, and box::width.

Referenced by layout_calculate_descendant_bboxes(), and layout_update_descendant_bbox().

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◆ layout_get_object_dimensions()

static void layout_get_object_dimensions	(	struct box *	box,
		int *	width,
		int *	height,
		int	min_width,
		int	max_width,
		int	min_height,
		int	max_height
	)

static

Compute the size of replaced boxes with auto dimensions, according to content.

Parameters

box	Box with object
width	Width value in px or AUTO. If AUTO, updated to value in px.
height	Height value in px or AUTO. If AUTO, updated to value in px.
min_width	Box's min width, as given by layout_find_dimensions.
max_width	Box's max width, as given by layout_find_dimensions.
min_height	Box's min height, as given by layout_find_dimensions.
max_height	Box's max height, as given by layout_find_dimensions.

See CSS 2.1 sections 10.3 and 10.6.

Definition at line 134 of file layout.c.

References AUTO, content_get_height(), content_get_width(), height, box::object, and width.

Referenced by layout_block_context(), layout_block_find_dimensions(), layout_float_find_dimensions(), layout_line(), and layout_minmax_line().

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◆ layout_inline_container()

static bool layout_inline_container	(	struct box *	inline_container,
		int	width,
		struct box *	cont,
		int	cx,
		int	cy,
		html_content *	content
	)

static

Layout lines of text or inline boxes with floats.

Parameters

box	inline container box
width	horizontal space available
cont	ancestor box which defines horizontal space, for floats
cx	box position relative to cont
cy	box position relative to cont
content	memory pool for any new boxes

Returns: true on success, false on memory exhaustion

Todo:: fix wrapping so that a box with horizontal scrollbar will shrink back to 'width' if no word is wider than 'width' (Or just set curwidth = width and have the multiword lines wrap to the min width)

Definition at line 3443 of file layout.c.

References BOX_BR, BOX_INLINE_CONTAINER, box::children, box::height, layout_line(), box::length, lh__box_is_object(), max, box::next, NSLOG, box::style, box::text, box::type, box::width, width, and box::y.

Referenced by layout_block_context().

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◆ layout_line()

static bool layout_line	(	struct box *	first,
		int *	width,
		int *	y,
		int	cx,
		int	cy,
		struct box *	cont,
		bool	indent,
		bool	has_text_children,
		html_content *	content,
		struct box **	next_box
	)

static

Position a line of boxes in inline formatting context.

Parameters

first	box at start of line
width	available width on input, updated with actual width on output (may be incorrect if the line gets split?)
y	coordinate of top of line, updated on exit to bottom
cx	coordinate of left of line relative to cont
cy	coordinate of top of line relative to cont
cont	ancestor box which defines horizontal space, for floats
indent	apply any first-line indent
has_text_children	at least one TEXT in the inline_container
next_box	updated to first box for next line, or 0 at end
content	memory pool for any new boxes

Returns: true on success, false on memory exhaustion

Todo:: handle errors

Todo:: handle errors

Todo:: handle errors

Todo:: handle errors

Todo:: handle errors

Todo:: proper vertical alignment handling

Definition at line 2707 of file layout.c.

References add_float_to_container(), AUTO, box::border, BOTTOM, BOX_BR, BOX_FLOAT_LEFT, BOX_INLINE, BOX_INLINE_BLOCK, BOX_INLINE_END, BOX_INLINE_FLEX, BOX_TEXT, box::cached_place_below_level, box::children, box::clear_level, content_can_reformat(), content_get_available_width(), content_get_height(), content_reformat(), find_sides(), box::flags, box::float_children, box::float_container, font_plot_style_from_css(), box::gadget, GADGET_SELECT, box::height, height, IFRAME, box::inline_end, form_control::items, layout_clear(), layout_find_dimensions(), layout_float(), layout_get_object_dimensions(), layout_text_box_split(), layout_text_indent(), LEFT, box::length, lh__box_is_float_box(), lh__box_is_inline_content(), lh__box_is_inline_flow(), lh__box_is_replace(), line_height(), box::margin, box::max_width, MEASURED, NEW_LINE, box::next, form_option::next, NSLOG, nsoption_bool, box::object, box::padding, box::parent, place_float_below(), PRIsizet, REPLACE_DIM, RIGHT, SCROLLBAR_WIDTH, form_control::select, box::space, gui_layout_table::split, box::style, box::text, form_option::text, TOP, box::type, form_control::type, UNKNOWN_WIDTH, form_option::value, box_border::width, box::width, width, gui_layout_table::width, box::x, and box::y.

Referenced by layout_inline_container().

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◆ layout_lists()

static void layout_lists	(	const html_content *	content,
		struct box *	box
	)

static

Layout list markers.

Definition at line 4396 of file layout.c.

References box::children, content_get_height(), content_get_width(), box::flags, font_plot_style_from_css(), box::height, layout__list_item_is_numerical(), layout__ordered_list_count(), layout__set_numerical_marker_text(), layout_lists(), box::length, line_height(), box::list_marker, MEASURED, box::next, box::object, box::style, box::text, UNKNOWN_WIDTH, content::width, box::width, box::x, and box::y.

Referenced by layout_document(), and layout_lists().

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◆ layout_minmax_block()

static void layout_minmax_block	(	struct box *	block,
		const struct gui_layout_table *	font_func,
		const html_content *	content
	)

static

Calculate minimum and maximum width of a block.

Parameters

block	box of type BLOCK, INLINE_BLOCK, or TABLE_CELL
font_func	font functions
content	The HTML content being layed out.

Postcondition: block->min_width and block->max_width filled in, 0 <= block->min_width <= block->max_width

Todo:: do we need to know the min/max width of the iframe's content?

Definition at line 859 of file layout.c.

References BOX_BLOCK, box_dump(), BOX_FLEX, BOX_INLINE_BLOCK, BOX_INLINE_CONTAINER, BOX_INLINE_FLEX, BOX_TABLE, BOX_TABLE_CELL, calculate_mbp_width(), box::children, content_get_type(), content_get_width(), CONTENT_HTML, box::flags, box::gadget, GADGET_CHECKBOX, GADGET_FILE, GADGET_PASSWORD, GADGET_RADIO, GADGET_TEXTAREA, GADGET_TEXTBOX, HAS_HEIGHT, height, html_get_box_tree(), IFRAME, layout_minmax_block(), layout_minmax_inline_container(), layout_minmax_table(), LEFT, lh__box_is_flex_container(), lh__box_is_flex_item(), lh__box_is_float_box(), lh__flex_main_is_horizontal(), MAKE_HEIGHT, max, box::max_width, min, box::min_width, NEED_MIN, box::next, box::object, box::parent, RIGHT, box::style, box::type, form_control::type, UNKNOWN_MAX_WIDTH, and width.

Referenced by layout_document(), layout_minmax_block(), layout_minmax_line(), and layout_minmax_table().

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◆ layout_minmax_inline_container()

static void layout_minmax_inline_container	(	struct box *	inline_container,
		bool *	has_height,
		const struct gui_layout_table *	font_func,
		const html_content *	content
	)

static

Calculate minimum and maximum width of an inline container.

Parameters

	inline_container	box of type INLINE_CONTAINER
[out]	has_height	set to true if container has height
	font_func	Font functions.

Postcondition: inline_container->min_width and inline_container->max_width filled in, 0 <= inline_container->min_width <= inline_container->max_width

Definition at line 811 of file layout.c.

References BOX_INLINE_CONTAINER, box::children, layout_minmax_line(), max, box::max_width, min, box::min_width, box::type, and UNKNOWN_MAX_WIDTH.

Referenced by layout_minmax_block().

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◆ layout_minmax_line()

static struct box * layout_minmax_line	(	struct box *	first,
		int *	line_min,
		int *	line_max,
		bool	first_line,
		bool *	line_has_height,
		const struct gui_layout_table *	font_func,
		const html_content *	content
	)

static

Calculate minimum and maximum width of a line.

Parameters

first	a box in an inline container
line_min	updated to minimum width of line starting at first
line_max	updated to maximum width of line starting at first
first_line	true iff this is the first line in the inline container
line_has_height	updated to true or false, depending on line
font_func	Font functions.

Returns: first box in next line, or 0 if no more lines

Postcondition: 0 <= *line_min <= *line_max

Todo:: handle errors

Definition at line 463 of file layout.c.

References AUTO, BOX_BR, box_has_percentage_max_width(), BOX_INLINE, BOX_INLINE_BLOCK, BOX_INLINE_END, BOX_INLINE_FLEX, BOX_TABLE, calculate_mbp_width(), box::children, box::flags, font_plot_style_from_css(), box::gadget, GADGET_SELECT, HAS_HEIGHT, height, IFRAME, box::inline_end, form_control::items, layout_get_object_dimensions(), layout_minmax_block(), layout_minmax_table(), layout_text_indent(), LEFT, box::length, lh__box_is_float_box(), lh__box_is_inline_content(), lh__box_is_replace(), max, box::max_width, MEASURED, min, box::min_width, NEED_MIN, box::next, form_option::next, NSLOG, nsoption_bool, box::object, box::parent, REPLACE_DIM, RIGHT, SCROLLBAR_WIDTH, form_control::select, box::space, box::style, box::text, form_option::text, box::type, form_control::type, UNKNOWN_WIDTH, form_option::value, box::width, width, and gui_layout_table::width.

Referenced by layout_minmax_inline_container().

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◆ layout_minmax_table()

static void layout_minmax_table	(	struct box *	table,
		const struct gui_layout_table *	font_func,
		const html_content *	content
	)

static

Calculate minimum and maximum width of a table.

Parameters

table	box of type TABLE
font_func	Font functions
content	The HTML content we are laying out.

Postcondition: table->min_width and table->max_width filled in, 0 <= table->min_width <= table->max_width

TODO: Handle colspan="0" correctly. It's currently converted to 1 in box normaisation

Definition at line 257 of file layout.c.

References box_dump(), BOX_TABLE_CELL, calculate_mbp_width(), box::children, box::col, box::columns, layout_minmax_block(), LEFT, column::max, max, box::max_width, column::min, min, box::min_width, box::next, NSLOG, RIGHT, box::start_column, box::style, table_calculate_column_types(), box::type, type, UNKNOWN_MAX_WIDTH, column::width, and width.

Referenced by layout_minmax_block(), and layout_minmax_line().

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◆ layout_move_children()

static void layout_move_children	(	struct box *	box,
		int	x,
		int	y
	)

static

Moves the children of a box by a specified amount.

Parameters

box	top of tree of boxes
x	the amount to move children by horizontally
y	the amount to move children by vertically

Definition at line 1579 of file layout.c.

References box::children, box::next, box::x, and box::y.

Referenced by layout_table().

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◆ layout_next_margin_block()

static struct box * layout_next_margin_block	(	const css_unit_ctx *	unit_len_ctx,
		struct box *	box,
		struct box *	block,
		int	viewport_height,
		int *	max_pos_margin,
		int *	max_neg_margin
	)

static

Find next block that current margin collapses to.

Parameters

unit_len_ctx	Length conversion context
box	box to start tree-order search from (top margin is included)
block	box responsible for current block fromatting context
viewport_height	height of viewport in px
max_pos_margin	updated to to maximum positive margin encountered
max_neg_margin	updated to to maximum negative margin encountered

Returns: next box that current margin collapses to, or NULL if none.

Definition at line 1139 of file layout.c.

References box::border, BOTTOM, BOX_BLOCK, BOX_INLINE_CONTAINER, box_is_first_child(), box::children, box::flags, layout_find_dimensions(), MAKE_HEIGHT, box::margin, box::next, box::object, box::padding, box::parent, box::style, TOP, box::type, box_border::width, and box::width.

Referenced by layout_block_context().

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◆ layout_position_absolute()

static bool layout_position_absolute	(	struct box *	box,
		struct box *	containing_block,
		int	cx,
		int	cy,
		html_content *	content
	)

static

Recursively layout and position absolutely positioned boxes.

Parameters

box	tree of boxes to layout
containing_block	current containing block
cx	position of box relative to containing_block
cy	position of box relative to containing_block
content	memory pool for any new boxes

Returns: true on success, false on memory exhaustion

Definition at line 4944 of file layout.c.

References BOX_BLOCK, BOX_FLEX, BOX_INLINE_BLOCK, BOX_INLINE_FLEX, BOX_TABLE, box::children, box::float_children, layout_absolute(), layout_position_absolute(), box::next, box::parent, box::style, box::type, box::x, and box::y.

Referenced by layout_document(), and layout_position_absolute().

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◆ layout_position_relative()

static void layout_position_relative	(	const css_unit_ctx *	unit_len_ctx,
		struct box *	root,
		struct box *	fp,
		int	fx,
		int	fy
	)

static

Adjust positions of relatively positioned boxes.

Parameters

unit_len_ctx	Length conversion context
root	box to adjust the position of
fp	box which forms the block formatting context for children of "root" which are floats
fx	x offset due to intervening relatively positioned boxes between current box, "root", and the block formatting context box, "fp", for float children of "root"
fy	y offset due to intervening relatively positioned boxes between current box, "root", and the block formatting context box, "fp", for float children of "root"

Todo:: ensure containing box is large enough after moving boxes

Definition at line 5092 of file layout.c.

References BOX_INLINE, BOX_TEXT, box::children, box::float_children, box::inline_end, layout_compute_relative_offset(), layout_position_relative(), box::next, box::next_float, root, box::style, box::type, box::x, and box::y.

Referenced by layout_document(), and layout_position_relative().

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◆ layout_solve_width()

static int layout_solve_width	(	struct box *	box,
		int	available_width,
		int	width,
		int	lm,
		int	rm,
		int	max_width,
		int	min_width
	)

static

Solve the width constraint as given in CSS 2.1 section 10.3.3.

Parameters

box	Box to solve constraint for
available_width	Max width available in pixels
width	Current box width
lm	Min left margin required to avoid floats in px. zero if not applicable
rm	Min right margin required to avoid floats in px. zero if not applicable
max_width	Box max-width ( -ve means no max-width to apply)
min_width	Box min-width ( <=0 means no min-width to apply)

Returns: New box width

Postcondition: box's left/right margins will be updated.

Definition at line 1346 of file layout.c.

References AUTO, box::border, LEFT, box::margin, box::max_width, box::min_width, box::padding, box::parent, RIGHT, box::style, box_border::width, and width.

Referenced by layout_absolute(), layout_block_context(), and layout_block_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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◆ layout_text_box_split()

static bool layout_text_box_split	(	html_content *	content,
		plot_font_style_t *	fstyle,
		struct box *	split_box,
		size_t	new_length,
		int	new_width
	)

static

Split a text box.

Parameters

content	memory pool for any new boxes
fstyle	style for text in text box
split_box	box with text to split
new_length	new length for text in split_box, after splitting
new_width	new width for text in split_box, after splitting

Returns: true on success, false on memory exhaustion

A new box is created and inserted into the box tree after split_box, containing the text after new_length excluding the initial space character.

Definition at line 2349 of file layout.c.

References CLONE, box::flags, box::last, box::length, MEASURED, box::next, NSLOG, box::parent, box::prev, PRIsizet, box::space, talloc_memdup, box::text, UNKNOWN_WIDTH, box::width, and gui_layout_table::width.

Referenced by layout_line().

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◆ layout_text_indent()

static int layout_text_indent	(	const css_unit_ctx *	unit_len_ctx,
		const css_computed_style *	style,
		int	width
	)

static

Calculate the text-indent length.

Parameters

style	style of block
width	width of containing block

Returns: length of indent

Definition at line 230 of file layout.c.

References width.

Referenced by layout_line(), and layout_minmax_line().

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◆ layout_update_descendant_bbox()

static void layout_update_descendant_bbox	(	const css_unit_ctx *	unit_len_ctx,
		struct box *	box,
		struct box *	child,
		int	off_x,
		int	off_y
	)

static

Apply changes to box descendant_[xy][01] values due to given child.

Parameters

unit_len_ctx	Length conversion context
box	box to update
child	a box, which may affect box's descendant bbox
off_x	offset to apply to child->x coord to treat as child of box
off_y	offset to apply to child->y coord to treat as child of box

Definition at line 5237 of file layout.c.

References content_get_type(), CONTENT_HTML, box::descendant_x0, box::descendant_x1, box::descendant_y0, box::descendant_y1, layout_get_box_bbox(), box::object, box::style, box::x, and box::y.

Referenced by layout_calculate_descendant_bboxes().

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◆ line_height()

static int line_height	(	const css_unit_ctx *	unit_len_ctx,
		const css_computed_style *	style
	)

static

Calculate line height from a style.

Definition at line 2654 of file layout.c.

References line_height(), and box::style.

Referenced by form_redraw_select_menu(), form_select_menu_clicked(), layout_line(), layout_lists(), line_height(), ro_gui_wimp_event_process_window_menu_click(), textarea_redraw(), textplain_coords_from_range(), textplain_offset_from_coords(), and textplain_redraw().

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◆ place_float_below()

static void place_float_below	(	struct box *	c,
		int	width,
		int	cx,
		int	y,
		struct box *	cont
	)

static

Position a float in the first available space.

Parameters

c	float box to position
width	available width
cx	x coordinate relative to cont to place float right of
y	y coordinate relative to cont to place float below
cont	ancestor box which defines horizontal space, for floats

Definition at line 2610 of file layout.c.

References BOX_FLOAT_LEFT, box::cached_place_below_level, find_sides(), box::float_children, box::height, NSLOG, box::type, box::width, width, box::x, and box::y.

Referenced by layout_line().

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Variable Documentation

◆ border_color_funcs

const css_border_color_func border_color_funcs[4]

Initial value:

= {
        [TOP]    = css_computed_border_top_color,
        [RIGHT]  = css_computed_border_right_color,
        [BOTTOM] = css_computed_border_bottom_color,
        [LEFT]   = css_computed_border_left_color,
}

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]

Initial value:

= {
        [TOP]    = css_computed_border_top_style,
        [RIGHT]  = css_computed_border_right_style,
        [BOTTOM] = css_computed_border_bottom_style,
        [LEFT]   = css_computed_border_left_style,
}

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]

Initial value:

= {
        [TOP]    = css_computed_border_top_width,
        [RIGHT]  = css_computed_border_right_width,
        [BOTTOM] = css_computed_border_bottom_width,
        [LEFT]   = css_computed_border_left_width,
}

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]

Initial value:

= {
        [TOP]    = css_computed_margin_top,
        [RIGHT]  = css_computed_margin_right,
        [BOTTOM] = css_computed_margin_bottom,
        [LEFT]   = css_computed_margin_left,
}

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]

Initial value:

= {
        [TOP]    = css_computed_padding_top,
        [RIGHT]  = css_computed_padding_right,
        [BOTTOM] = css_computed_padding_bottom,
        [LEFT]   = css_computed_padding_left,
}

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().

Functions

Variables

Detailed Description

Function Documentation

◆ add_float_to_container()

◆ box_has_percentage_max_width()

◆ find_sides()

◆ layout__check_element_type()

◆ layout__get_element_tag()

◆ layout__get_li_value()

◆ layout__get_list_item_count()

◆ layout__get_ol_reversed()

◆ layout__get_ol_start()

◆ layout__list_item_is_numerical()

◆ layout__ordered_list_count()

◆ layout__set_numerical_marker_text()

◆ layout_absolute()

◆ layout_apply_minmax_height()

◆ layout_block_add_scrollbar()

◆ layout_block_context()

◆ layout_block_find_dimensions()

◆ layout_block_object()

◆ layout_calculate_descendant_bboxes()

◆ layout_clear()

◆ layout_compute_offsets()

◆ layout_compute_relative_offset()

◆ layout_document()

◆ layout_float()

◆ layout_float_find_dimensions()

◆ layout_get_box_bbox()

◆ layout_get_object_dimensions()

◆ layout_inline_container()

◆ layout_line()

◆ layout_lists()

◆ layout_minmax_block()

◆ layout_minmax_inline_container()

◆ layout_minmax_line()

◆ layout_minmax_table()

◆ layout_move_children()

◆ layout_next_margin_block()

◆ layout_position_absolute()

◆ layout_position_relative()

◆ layout_solve_width()

◆ layout_table()

◆ layout_text_box_split()

◆ layout_text_indent()

◆ layout_update_descendant_bbox()

◆ line_height()

◆ place_float_below()

Variable Documentation

◆ border_color_funcs

◆ border_style_funcs

◆ border_width_funcs

◆ margin_funcs

◆ padding_funcs