knockout.c File Reference

Knockout rendering implementation. More...

#include <assert.h>
#include <string.h>
#include <stdio.h>
#include "utils/utils.h"
#include "utils/log.h"
#include "utils/errors.h"
#include "netsurf/bitmap.h"
#include "content/content.h"
#include "netsurf/plotters.h"
#include "desktop/gui_internal.h"
#include "desktop/knockout.h"

Include dependency graph for knockout.c:

Go to the source code of this file.

Data Structures
struct	knockout_box
struct	knockout_entry

Macros
#define	KNOCKOUT_ENTRIES   3072 /* 40 bytes each */
#define	KNOCKOUT_BOXES   768 /* 28 bytes each */
#define	KNOCKOUT_POLYGONS   3072 /* 4 bytes each */

Enumerations
enum	knockout_type {   KNOCKOUT_PLOT_RECTANGLE , KNOCKOUT_PLOT_LINE , KNOCKOUT_PLOT_POLYGON , KNOCKOUT_PLOT_FILL ,   KNOCKOUT_PLOT_CLIP , KNOCKOUT_PLOT_TEXT , KNOCKOUT_PLOT_DISC , KNOCKOUT_PLOT_ARC ,   KNOCKOUT_PLOT_BITMAP , KNOCKOUT_PLOT_GROUP_START , KNOCKOUT_PLOT_GROUP_END }

Functions
static nserror	knockout_plot_fill_recursive (const struct redraw_context *ctx, struct knockout_box *box, plot_style_t *plot_style)
	fill an area recursively More...
static nserror	knockout_plot_bitmap_recursive (const struct redraw_context *ctx, struct knockout_box *box, struct knockout_entry *entry)
	bitmap plot recusivley More...
static nserror	knockout_plot_flush (const struct redraw_context *ctx)
	Flush the current knockout session to empty the buffers. More...
static void	knockout_calculate (const struct redraw_context *ctx, int x0, int y0, int x1, int y1, struct knockout_box *owner)
	Knockout a section of previous rendering. More...
static nserror	knockout_plot_rectangle (const struct redraw_context *ctx, const plot_style_t *pstyle, const struct rect *rect)
	knockout rectangle plotting. More...
static nserror	knockout_plot_line (const struct redraw_context *ctx, const plot_style_t *pstyle, const struct rect *line)
	Knockout line plotting. More...
static nserror	knockout_plot_polygon (const struct redraw_context *ctx, const plot_style_t *pstyle, const int *p, unsigned int n)
	Knockout polygon plotting. More...
static nserror	knockout_plot_path (const struct redraw_context *ctx, const plot_style_t *pstyle, const float *p, unsigned int n, const float transform[6])
	knockout path plotting. More...
static nserror	knockout_plot_clip (const struct redraw_context *ctx, const struct rect *clip)
static nserror	knockout_plot_text (const struct redraw_context *ctx, const plot_font_style_t *fstyle, int x, int y, const char *text, size_t length)
	Text plotting. More...
static nserror	knockout_plot_disc (const struct redraw_context *ctx, const plot_style_t *pstyle, int x, int y, int radius)
	knockout circle plotting More...
static nserror	knockout_plot_arc (const struct redraw_context *ctx, const plot_style_t *pstyle, int x, int y, int radius, int angle1, int angle2)
	Plots an arc. More...
static nserror	knockout_plot_bitmap (const struct redraw_context *ctx, struct bitmap *bitmap, int x, int y, int width, int height, colour bg, bitmap_flags_t flags)
	knockout bitmap plotting. More...
static nserror	knockout_plot_group_start (const struct redraw_context *ctx, const char *name)
	Start of a group of objects. More...
static nserror	knockout_plot_group_end (const struct redraw_context *ctx)
	End a group of objects. More...
bool	knockout_plot_start (const struct redraw_context *ctx, struct redraw_context *knk_ctx)
	Start a knockout plotting session. More...
bool	knockout_plot_end (const struct redraw_context *ctx)
	End a knockout plotting session. More...

Variables
static struct knockout_entry	knockout_entries [KNOCKOUT_ENTRIES]
static struct knockout_box	knockout_boxes [KNOCKOUT_BOXES]
static int	knockout_polygons [KNOCKOUT_POLYGONS]
static int	knockout_entry_cur = 0
static int	knockout_box_cur = 0
static int	knockout_polygon_cur = 0
static struct knockout_box *	knockout_list = NULL
static struct plotter_table	real_plot
static struct rect	clip_cur
static int	nested_depth = 0
const struct plotter_table	knockout_plotters
	knockout plotter operation table More...

Detailed Description

Knockout rendering implementation.

Knockout rendering is an optimisation which is particularly for unaccelerated screen redraw. It tries to avoid plotting the same area more than once.

If the object is to plot two overlapping rectangles (one large, one small), such as:

+--------------—+ |#################| |####+----—+####| |####|:::::::|####| |####|:::::::|####| |####|:::::::|####| |####+----—+####| |#################| +--------------—+

Without knockout rendering we plot the bottom rectangle and then the top one:

+--------------—+ +--------------—+ |#################| |#################| |#################| |####+----—+####| |#################| |####|:::::::|####| |#################| and then, |####|:::::::|####| |#################| |####|:::::::|####| |#################| |####+----—+####| |#################| |#################| +--------------—+ +--------------—+

With knockout rendering, the bottom rectangle is split up into smaller ones and each pixel is just plotted once:

+--------------—+ |#################| +-—+----—+-—+ |####|:::::::|####| |####|:::::::|####| |####|:::::::|####| +-—+----—+-—+ |#################| +--------------—+

Definition in file knockout.c.

Macro Definition Documentation

KNOCKOUT_BOXES

#define KNOCKOUT_BOXES   768 /* 28 bytes each */

Definition at line 84 of file knockout.c.

KNOCKOUT_ENTRIES

#define KNOCKOUT_ENTRIES   3072 /* 40 bytes each */

Definition at line 83 of file knockout.c.

KNOCKOUT_POLYGONS

#define KNOCKOUT_POLYGONS   3072 /* 4 bytes each */

Definition at line 85 of file knockout.c.

Enumeration Type Documentation

knockout_type

enum knockout_type

Enumerator
KNOCKOUT_PLOT_RECTANGLE
KNOCKOUT_PLOT_LINE
KNOCKOUT_PLOT_POLYGON
KNOCKOUT_PLOT_FILL
KNOCKOUT_PLOT_CLIP
KNOCKOUT_PLOT_TEXT
KNOCKOUT_PLOT_DISC
KNOCKOUT_PLOT_ARC
KNOCKOUT_PLOT_BITMAP
KNOCKOUT_PLOT_GROUP_START
KNOCKOUT_PLOT_GROUP_END

Definition at line 90 of file knockout.c.

Function Documentation

knockout_calculate()

static void knockout_calculate ( const struct redraw_context *  ctx, int  x0, int  y0, int  x1, int  y1, struct knockout_box *  owner  )

static

Knockout a section of previous rendering.

Parameters

ctx	The current redraw context.
x0	The left edge of the removal box
y0	The bottom edge of the removal box
x1	The right edge of the removal box
y1	The top edge of the removal box
owner	The parent box set to consider, or NULL for top level

Definition at line 394 of file knockout.c.

References knockout_box::bbox, knockout_box::child, knockout_box::deleted, knockout_box_cur, KNOCKOUT_BOXES, knockout_boxes, knockout_calculate(), knockout_list, knockout_plot_flush(), knockout_box::next, parent, rect::x0, rect::x1, rect::y0, and rect::y1.

Referenced by knockout_calculate(), knockout_plot_bitmap(), and knockout_plot_rectangle().

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knockout_plot_arc()

static nserror knockout_plot_arc ( const struct redraw_context *  ctx, const plot_style_t *  pstyle, int  x, int  y, int  radius, int  angle1, int  angle2  )

static

Plots an arc.

plot an arc segment around (x,y), anticlockwise from angle1 to angle2. Angles are measured anticlockwise from horizontal, in degrees.

Parameters

ctx	The current redraw context.
pstyle	Style controlling the arc plot.
x	The x coordinate of the arc.
y	The y coordinate of the arc.
radius	The radius of the arc.
angle1	The start angle of the arc.
angle2	The finish angle of the arc.

Returns

NSERROR_OK on success else error code.

Definition at line 807 of file knockout.c.

References knockout_entry::angle1, knockout_entry::angle2, knockout_entry::arc, knockout_entry::data, KNOCKOUT_ENTRIES, knockout_entries, knockout_entry_cur, KNOCKOUT_PLOT_ARC, knockout_plot_flush(), NSERROR_OK, knockout_entry::plot_style, knockout_entry::radius, knockout_entry::type, knockout_entry::x, and knockout_entry::y.

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knockout_plot_bitmap()

static nserror knockout_plot_bitmap ( const struct redraw_context *  ctx, struct bitmap *  bitmap, int  x, int  y, int  width, int  height, colour  bg, bitmap_flags_t  flags  )

static

knockout bitmap plotting.

Tiled plot of a bitmap image. (x,y) gives the top left coordinate of an explicitly placed tile. From this tile the image can repeat in all four directions – up, down, left and right – to the extents given by the current clip rectangle.

The bitmap_flags say whether to tile in the x and y directions. If not tiling in x or y directions, the single image is plotted. The width and height give the dimensions the image is to be scaled to.

Parameters

ctx	The current redraw context.
bitmap	The bitmap to plot
x	The x coordinate to plot the bitmap
y	The y coordiante to plot the bitmap
width	The width of area to plot the bitmap into
height	The height of area to plot the bitmap into
bg	the background colour to alpha blend into
flags	the flags controlling the type of plot operation

Returns

NSERROR_OK on success else error code.

Definition at line 856 of file knockout.c.

References knockout_box::bbox, netsurf_table::bitmap, knockout_entry::bitmap, bitmap(), BITMAPF_REPEAT_X, BITMAPF_REPEAT_Y, knockout_entry::box, knockout_box::child, clip_cur, knockout_entry::data, knockout_box::deleted, gui_bitmap_table::get_opaque, guit, bitmap::height, height, knockout_box_cur, KNOCKOUT_BOXES, knockout_boxes, knockout_calculate(), KNOCKOUT_ENTRIES, knockout_entries, knockout_entry_cur, knockout_list, KNOCKOUT_PLOT_BITMAP, knockout_plot_clip(), knockout_plot_flush(), knockout_box::next, NSERROR_OK, knockout_entry::type, bitmap::width, width, rect::x0, rect::x1, rect::y0, and rect::y1.

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knockout_plot_bitmap_recursive()

static nserror knockout_plot_bitmap_recursive ( const struct redraw_context *  ctx, struct knockout_box *  box, struct knockout_entry *  entry  )

static

bitmap plot recusivley

Definition at line 221 of file knockout.c.

References knockout_entry::bitmap, plotter_table::bitmap, plotter_table::clip, knockout_entry::data, bitmap::height, knockout_plot_bitmap_recursive(), NSERROR_OK, parent, real_plot, and bitmap::width.

Referenced by knockout_plot_bitmap_recursive(), and knockout_plot_flush().

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knockout_plot_clip()

static nserror knockout_plot_clip ( const struct redraw_context *  ctx, const struct rect *  clip  )

static

Definition at line 699 of file knockout.c.

References knockout_entry::clip, clip(), clip_cur, knockout_entry::data, KNOCKOUT_ENTRIES, knockout_entries, knockout_entry_cur, KNOCKOUT_PLOT_CLIP, knockout_plot_flush(), NSERROR_BAD_SIZE, NSERROR_OK, NSLOG, and knockout_entry::type.

Referenced by knockout_plot_bitmap().

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knockout_plot_disc()

static nserror knockout_plot_disc ( const struct redraw_context *  ctx, const plot_style_t *  pstyle, int  x, int  y, int  radius  )

static

knockout circle plotting

Plot a circle centered on (x,y), which is optionally filled.

Parameters

ctx	The current redraw context.
pstyle	Style controlling the circle plot.
x	x coordinate of circle centre.
y	y coordinate of circle centre.
radius	circle radius.

Returns

NSERROR_OK on success else error code.

Definition at line 770 of file knockout.c.

References knockout_entry::data, knockout_entry::disc, KNOCKOUT_ENTRIES, knockout_entries, knockout_entry_cur, KNOCKOUT_PLOT_DISC, knockout_plot_flush(), NSERROR_OK, knockout_entry::plot_style, knockout_entry::radius, knockout_entry::type, knockout_entry::x, and knockout_entry::y.

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knockout_plot_end()

bool knockout_plot_end

(

const struct redraw_context *

ctx

)

End a knockout plotting session.

Returns

true on success, false otherwise

Definition at line 997 of file knockout.c.

References knockout_plot_flush(), and nested_depth.

Referenced by browser_window_redraw(), content_scaled_redraw(), knockout_plot_start(), page_info_redraw(), and treeview_redraw().

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knockout_plot_fill_recursive()

static nserror knockout_plot_fill_recursive ( const struct redraw_context *  ctx, struct knockout_box *  box, plot_style_t *  plot_style  )

static

fill an area recursively

Definition at line 190 of file knockout.c.

References knockout_plot_fill_recursive(), NSERROR_OK, parent, real_plot, and plotter_table::rectangle.

Referenced by knockout_plot_fill_recursive(), and knockout_plot_flush().

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knockout_plot_flush()

static nserror knockout_plot_flush ( const struct redraw_context *  ctx )

static

Flush the current knockout session to empty the buffers.

Returns

true on success, false otherwise

Definition at line 261 of file knockout.c.

References knockout_entry::angle1, knockout_entry::angle2, knockout_entry::arc, plotter_table::arc, knockout_entry::bitmap, plotter_table::bitmap, knockout_entry::box, knockout_box::child, knockout_entry::clip, plotter_table::clip, knockout_entry::data, knockout_entry::disc, plotter_table::disc, knockout_entry::fill, plotter_table::group_end, knockout_entry::group_start, plotter_table::group_start, bitmap::height, knockout_box_cur, KNOCKOUT_BOXES, KNOCKOUT_ENTRIES, knockout_entries, knockout_entry_cur, knockout_list, KNOCKOUT_PLOT_ARC, KNOCKOUT_PLOT_BITMAP, knockout_plot_bitmap_recursive(), KNOCKOUT_PLOT_CLIP, KNOCKOUT_PLOT_DISC, KNOCKOUT_PLOT_FILL, knockout_plot_fill_recursive(), KNOCKOUT_PLOT_GROUP_END, KNOCKOUT_PLOT_GROUP_START, KNOCKOUT_PLOT_LINE, KNOCKOUT_PLOT_POLYGON, KNOCKOUT_PLOT_RECTANGLE, KNOCKOUT_PLOT_TEXT, knockout_polygon_cur, KNOCKOUT_POLYGONS, knockout_entry::l, knockout_entry::line, plotter_table::line, knockout_entry::n, knockout_entry::name, NSERROR_OK, NSLOG, knockout_entry::p, knockout_entry::plot_style, knockout_entry::polygon, plotter_table::polygon, knockout_entry::r, knockout_entry::radius, real_plot, knockout_entry::rectangle, plotter_table::rectangle, knockout_entry::text, plotter_table::text, type, bitmap::width, knockout_entry::x, and knockout_entry::y.

Referenced by knockout_calculate(), knockout_plot_arc(), knockout_plot_bitmap(), knockout_plot_clip(), knockout_plot_disc(), knockout_plot_end(), knockout_plot_group_end(), knockout_plot_group_start(), knockout_plot_line(), knockout_plot_path(), knockout_plot_polygon(), knockout_plot_rectangle(), and knockout_plot_text().

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knockout_plot_group_end()

static nserror knockout_plot_group_end ( const struct redraw_context *  ctx )

static

End a group of objects.

Used when plotter implements export to a vector graphics file format.

Parameters

ctx	The current redraw context.

Returns

NSERROR_OK on success else error code.

Definition at line 957 of file knockout.c.

References plotter_table::group_end, KNOCKOUT_ENTRIES, knockout_entries, knockout_entry_cur, knockout_plot_flush(), KNOCKOUT_PLOT_GROUP_END, NSERROR_OK, real_plot, and knockout_entry::type.

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knockout_plot_group_start()

static nserror knockout_plot_group_start ( const struct redraw_context *  ctx, const char *  name  )

static

Start of a group of objects.

Used when plotter implements export to a vector graphics file format.

Parameters

ctx	The current redraw context.
name	The name of the group being started.

Returns

NSERROR_OK on success else error code.

Definition at line 934 of file knockout.c.

References knockout_entry::data, knockout_entry::group_start, plotter_table::group_start, KNOCKOUT_ENTRIES, knockout_entries, knockout_entry_cur, knockout_plot_flush(), KNOCKOUT_PLOT_GROUP_START, knockout_entry::name, NSERROR_OK, real_plot, and knockout_entry::type.

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knockout_plot_line()

static nserror knockout_plot_line ( const struct redraw_context *  ctx, const plot_style_t *  pstyle, const struct rect *  line  )

static

Knockout line plotting.

plot a line from (x0,y0) to (x1,y1). Coordinates are at centre of line width/thickness.

Parameters

ctx	The current redraw context.
pstyle	Style controlling the line plot.
line	A rectangle defining the line to be drawn

Returns

NSERROR_OK on success else error code.

Definition at line 591 of file knockout.c.

References knockout_entry::data, KNOCKOUT_ENTRIES, knockout_entries, knockout_entry_cur, knockout_plot_flush(), KNOCKOUT_PLOT_LINE, knockout_entry::l, knockout_entry::line, line(), NSERROR_OK, knockout_entry::plot_style, and knockout_entry::type.

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knockout_plot_path()

static nserror knockout_plot_path ( const struct redraw_context *  ctx, const plot_style_t *  pstyle, const float *  p, unsigned int  n, const float  transform[6]  )

static

knockout path plotting.

The knockout implementation simply flushes the queue and plots the path directly using real plotter.

Parameters

ctx	The current redraw context.
pstyle	Style controlling the path plot.
p	elements of path
n	nunber of elements on path
transform	A transform to apply to the path.

Returns

NSERROR_OK on success else error code.

Definition at line 678 of file knockout.c.

References knockout_plot_flush(), NSERROR_OK, plotter_table::path, and real_plot.

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knockout_plot_polygon()

static nserror knockout_plot_polygon ( const struct redraw_context *  ctx, const plot_style_t *  pstyle, const int *  p, unsigned int  n  )

static

Knockout polygon plotting.

Plots a filled polygon with straight lines between points. The lines around the edge of the ploygon are not plotted. The polygon is filled with the non-zero winding rule.

Parameters

ctx	The current redraw context.
pstyle	Style controlling the polygon plot.
p	verticies of polygon
n	number of verticies.

Returns

NSERROR_OK on success else error code.

Definition at line 620 of file knockout.c.

References knockout_entry::data, KNOCKOUT_ENTRIES, knockout_entries, knockout_entry_cur, knockout_plot_flush(), KNOCKOUT_PLOT_POLYGON, knockout_polygon_cur, KNOCKOUT_POLYGONS, knockout_polygons, knockout_entry::n, NSERROR_OK, knockout_entry::p, knockout_entry::plot_style, knockout_entry::polygon, plotter_table::polygon, real_plot, and knockout_entry::type.

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knockout_plot_rectangle()

static nserror knockout_plot_rectangle ( const struct redraw_context *  ctx, const plot_style_t *  pstyle, const struct rect *  rect  )

static

knockout rectangle plotting.

The rectangle can be filled an outline or both controlled by the plot style The line can be solid, dotted or dashed. Top left corner at (x0,y0) and rectangle has given width and height.

Parameters

ctx	The current redraw context.
pstyle	Style controlling the rectangle plot.
rect	A rectangle defining the line to be drawn

Returns

NSERROR_OK on success else error code.

Definition at line 526 of file knockout.c.

References knockout_box::bbox, knockout_entry::box, knockout_box::child, clip_cur, knockout_entry::data, knockout_box::deleted, knockout_entry::fill, plot_style_s::fill_type, knockout_box_cur, KNOCKOUT_BOXES, knockout_boxes, knockout_calculate(), KNOCKOUT_ENTRIES, knockout_entries, knockout_entry_cur, knockout_list, KNOCKOUT_PLOT_FILL, knockout_plot_flush(), KNOCKOUT_PLOT_RECTANGLE, knockout_box::next, NSERROR_OK, PLOT_OP_TYPE_NONE, knockout_entry::plot_style, knockout_entry::r, knockout_entry::rectangle, plot_style_s::stroke_type, knockout_entry::type, rect::x0, rect::x1, rect::y0, and rect::y1.

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knockout_plot_start()

bool knockout_plot_start	(	const struct redraw_context *	ctx,
		struct redraw_context *	knk_ctx
	)

Start a knockout plotting session.

Parameters

ctx	the redraw context with real plotter table
knk_ctx	updated to copy of ctx, with plotter table replaced

Returns

true on success, false otherwise

Definition at line 971 of file knockout.c.

References knockout_entry_cur, knockout_plot_end(), knockout_plotters, nested_depth, redraw_context::plot, real_plot, and plotter_table::rectangle.

Referenced by browser_window_redraw(), content_scaled_redraw(), page_info_redraw(), and treeview_redraw().

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knockout_plot_text()

static nserror knockout_plot_text ( const struct redraw_context *  ctx, const plot_font_style_t *  fstyle, int  x, int  y, const char *  text, size_t  length  )

static

Text plotting.

Parameters

ctx	The current redraw context.
fstyle	plot style for this text
x	x coordinate
y	y coordinate
text	UTF-8 string to plot
length	length of string, in bytes

Returns

NSERROR_OK on success else error code.

Definition at line 735 of file knockout.c.

References knockout_entry::data, KNOCKOUT_ENTRIES, knockout_entries, knockout_entry_cur, knockout_plot_flush(), KNOCKOUT_PLOT_TEXT, NSERROR_OK, knockout_entry::text, text(), and knockout_entry::type.

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Variable Documentation

clip_cur

struct rect clip_cur

static

Definition at line 182 of file knockout.c.

Referenced by knockout_plot_bitmap(), knockout_plot_clip(), and knockout_plot_rectangle().

knockout_box_cur

int knockout_box_cur = 0

static

Definition at line 176 of file knockout.c.

Referenced by knockout_calculate(), knockout_plot_bitmap(), knockout_plot_flush(), and knockout_plot_rectangle().

knockout_boxes

struct knockout_box knockout_boxes[KNOCKOUT_BOXES]

static

Definition at line 173 of file knockout.c.

Referenced by knockout_calculate(), knockout_plot_bitmap(), and knockout_plot_rectangle().

knockout_entries

struct knockout_entry knockout_entries[KNOCKOUT_ENTRIES]

static

Definition at line 172 of file knockout.c.

Referenced by knockout_plot_arc(), knockout_plot_bitmap(), knockout_plot_clip(), knockout_plot_disc(), knockout_plot_flush(), knockout_plot_group_end(), knockout_plot_group_start(), knockout_plot_line(), knockout_plot_polygon(), knockout_plot_rectangle(), and knockout_plot_text().

knockout_entry_cur

int knockout_entry_cur = 0

static

Definition at line 175 of file knockout.c.

Referenced by knockout_plot_arc(), knockout_plot_bitmap(), knockout_plot_clip(), knockout_plot_disc(), knockout_plot_flush(), knockout_plot_group_end(), knockout_plot_group_start(), knockout_plot_line(), knockout_plot_polygon(), knockout_plot_rectangle(), knockout_plot_start(), and knockout_plot_text().

knockout_list

struct knockout_box* knockout_list = NULL

static

Definition at line 178 of file knockout.c.

Referenced by knockout_calculate(), knockout_plot_bitmap(), knockout_plot_flush(), and knockout_plot_rectangle().

knockout_plotters

const struct plotter_table knockout_plotters

Initial value:

= {
        .rectangle = knockout_plot_rectangle,
        .line = knockout_plot_line,
        .polygon = knockout_plot_polygon,
        .clip = knockout_plot_clip,
        .text = knockout_plot_text,
        .disc = knockout_plot_disc,
        .arc = knockout_plot_arc,
        .bitmap = knockout_plot_bitmap,
        .group_start = knockout_plot_group_start,
        .group_end = knockout_plot_group_end,
        .flush = knockout_plot_flush,
        .path = knockout_plot_path,
        .option_knockout = true,
}

knockout plotter operation table

Definition at line 1012 of file knockout.c.

Referenced by knockout_plot_start().

knockout_polygon_cur

int knockout_polygon_cur = 0

static

Definition at line 177 of file knockout.c.

Referenced by knockout_plot_flush(), and knockout_plot_polygon().

knockout_polygons

int knockout_polygons[KNOCKOUT_POLYGONS]

static

Definition at line 174 of file knockout.c.

Referenced by knockout_plot_polygon().

nested_depth

int nested_depth = 0

static

Definition at line 183 of file knockout.c.

Referenced by knockout_plot_end(), and knockout_plot_start().

real_plot

struct plotter_table real_plot

static

Definition at line 180 of file knockout.c.

Referenced by knockout_plot_bitmap_recursive(), knockout_plot_fill_recursive(), knockout_plot_flush(), knockout_plot_group_end(), knockout_plot_group_start(), knockout_plot_path(), knockout_plot_polygon(), and knockout_plot_start().