drawutils.c File Reference

#include <string.h>
#include "libavutil/avutil.h"
#include "libavutil/colorspace.h"
#include "libavutil/mem.h"
#include "libavutil/pixdesc.h"
#include "drawutils.h"
#include "formats.h"

Go to the source code of this file.

Enumerations
enum	{ RED = 0, GREEN, BLUE, ALPHA }

Functions
int	ff_fill_rgba_map (uint8_t *rgba_map, enum AVPixelFormat pix_fmt)
int	ff_fill_line_with_color (uint8_t *line[4], int pixel_step[4], int w, uint8_t dst_color[4], enum AVPixelFormat pix_fmt, uint8_t rgba_color[4], int *is_packed_rgba, uint8_t rgba_map_ptr[4])
void	ff_draw_rectangle (uint8_t *dst[4], int dst_linesize[4], uint8_t *src[4], int pixelstep[4], int hsub, int vsub, int x, int y, int w, int h)
void	ff_copy_rectangle (uint8_t *dst[4], int dst_linesize[4], uint8_t *src[4], int src_linesize[4], int pixelstep[4], int hsub, int vsub, int x, int y, int y2, int w, int h)
int	ff_draw_init (FFDrawContext *draw, enum AVPixelFormat format, unsigned flags)
	Init a draw context.
void	ff_draw_color (FFDrawContext *draw, FFDrawColor *color, const uint8_t rgba[4])
	Prepare a color.
static uint8_t *	pointer_at (FFDrawContext *draw, uint8_t *data[], int linesize[], int plane, int x, int y)
void	ff_copy_rectangle2 (FFDrawContext *draw, uint8_t *dst[], int dst_linesize[], uint8_t *src[], int src_linesize[], int dst_x, int dst_y, int src_x, int src_y, int w, int h)
	Copy a rectangle from an image to another.
void	ff_fill_rectangle (FFDrawContext *draw, FFDrawColor *color, uint8_t *dst[], int dst_linesize[], int dst_x, int dst_y, int w, int h)
	Fill a rectangle with an uniform color.
static void	clip_interval (int wmax, int *x, int *w, int *dx)
	Clip interval [x; x+w[ within [0; wmax[.
static void	subsampling_bounds (int sub, int *x, int *w, int *start, int *end)
	Decompose w pixels starting at x into start + (w starting at x) + end with x and w aligned on multiples of 1<<sub.
static int	component_used (FFDrawContext *draw, int plane, int comp)
static void	blend_line (uint8_t *dst, unsigned src, unsigned alpha, int dx, int w, unsigned hsub, int left, int right)
void	ff_blend_rectangle (FFDrawContext *draw, FFDrawColor *color, uint8_t *dst[], int dst_linesize[], int dst_w, int dst_h, int x0, int y0, int w, int h)
	Blend a rectangle with an uniform color.
static void	blend_pixel (uint8_t *dst, unsigned src, unsigned alpha, uint8_t *mask, int mask_linesize, int l2depth, unsigned w, unsigned h, unsigned shift, unsigned xm0)
static void	blend_line_hv (uint8_t *dst, int dst_delta, unsigned src, unsigned alpha, uint8_t *mask, int mask_linesize, int l2depth, int w, unsigned hsub, unsigned vsub, int xm, int left, int right, int hband)
void	ff_blend_mask (FFDrawContext *draw, FFDrawColor *color, uint8_t *dst[], int dst_linesize[], int dst_w, int dst_h, uint8_t *mask, int mask_linesize, int mask_w, int mask_h, int l2depth, unsigned endianness, int x0, int y0)
	Blend an alpha mask with an uniform color.
int	ff_draw_round_to_sub (FFDrawContext *draw, int sub_dir, int round_dir, int value)
	Round a dimension according to subsampling.
AVFilterFormats *	ff_draw_supported_pixel_formats (unsigned flags)
	Return the list of pixel formats supported by the draw functions.

Enumeration Type Documentation

anonymous enum

Enumerator:

RED
GREEN
BLUE
ALPHA

Definition at line 31 of file drawutils.c.

Function Documentation

int ff_fill_rgba_map	(	uint8_t *	rgba_map,
		enum AVPixelFormat	pix_fmt
	)

Definition at line 33 of file drawutils.c.

Referenced by config_input(), config_input_main(), config_input_overlay(), config_input_ref(), config_output(), config_props(), ff_draw_color(), and ff_fill_line_with_color().

int ff_fill_line_with_color	(	uint8_t *	line[4],
		int	pixel_step[4],
		int	w,
		uint8_t	dst_color[4],
		enum AVPixelFormat	pix_fmt,
		uint8_t	rgba_color[4],
		int *	is_packed_rgba,
		uint8_t	rgba_map_ptr[4]
	)

Definition at line 62 of file drawutils.c.

void ff_draw_rectangle	(	uint8_t *	dst[4],
		int	dst_linesize[4],
		uint8_t *	src[4],
		int	pixelstep[4],
		int	hsub,
		int	vsub,
		int	x,
		int	y,
		int	w,
		int	h
	)

Definition at line 105 of file drawutils.c.

void ff_copy_rectangle	(	uint8_t *	dst[4],
		int	dst_linesize[4],
		uint8_t *	src[4],
		int	src_linesize[4],
		int	pixelstep[4],
		int	hsub,
		int	vsub,
		int	x,
		int	y,
		int	y2,
		int	w,
		int	h
	)

Definition at line 127 of file drawutils.c.

int ff_draw_init	(	FFDrawContext *	draw,
		enum AVPixelFormat	format,
		unsigned	flags
	)

Init a draw context.

Only a limited number of pixel formats are supported, if format is not supported the function will return an error. No flags currently defined.

Returns

0 for success, < 0 for error

Definition at line 149 of file drawutils.c.

Referenced by config_input(), config_props(), and ff_draw_supported_pixel_formats().

void ff_draw_color	(	FFDrawContext *	draw,
		FFDrawColor *	color,
		const uint8_t	rgba[4]
	)

Prepare a color.

Definition at line 191 of file drawutils.c.

Referenced by config_input(), config_props(), draw_text(), and overlay_ass_image().

static uint8_t* pointer_at ( FFDrawContext *  draw, uint8_t *  data[], int  linesize[], int  plane, int  x, int  y  )

static

Definition at line 223 of file drawutils.c.

Referenced by ff_blend_mask(), ff_blend_rectangle(), ff_copy_rectangle2(), and ff_fill_rectangle().

void ff_copy_rectangle2	(	FFDrawContext *	draw,
		uint8_t *	dst[],
		int	dst_linesize[],
		uint8_t *	src[],
		int	src_linesize[],
		int	dst_x,
		int	dst_y,
		int	src_x,
		int	src_y,
		int	w,
		int	h
	)

Copy a rectangle from an image to another.

The coordinates must be as even as the subsampling requires.

Definition at line 231 of file drawutils.c.

Referenced by filter_frame().

void ff_fill_rectangle	(	FFDrawContext *	draw,
		FFDrawColor *	color,
		uint8_t *	dst[],
		int	dst_linesize[],
		int	dst_x,
		int	dst_y,
		int	w,
		int	h
	)

Fill a rectangle with an uniform color.

The coordinates must be as even as the subsampling requires. The color needs to be inited with ff_draw_color.

Definition at line 253 of file drawutils.c.

Referenced by draw_blank_frame(), and filter_frame().

static void clip_interval ( int  wmax, int *  x, int *  w, int *  dx  )

static

Clip interval [x; x+w[ within [0; wmax[.

The resulting w may be negative if the final interval is empty. dx, if not null, return the difference between in and out value of x.

Definition at line 287 of file drawutils.c.

Referenced by ff_blend_mask(), and ff_blend_rectangle().

static void subsampling_bounds ( int  sub, int *  x, int *  w, int *  start, int *  end  )

static

Decompose w pixels starting at x into start + (w starting at x) + end with x and w aligned on multiples of 1<<sub.

Definition at line 306 of file drawutils.c.

Referenced by ff_blend_mask(), and ff_blend_rectangle().

static int component_used ( FFDrawContext *  draw, int  plane, int  comp  )

static

Definition at line 318 of file drawutils.c.

Referenced by ff_blend_mask(), and ff_blend_rectangle().

static void blend_line ( uint8_t *  dst, unsigned  src, unsigned  alpha, int  dx, int  w, unsigned  hsub, int  left, int  right  )

static

Definition at line 326 of file drawutils.c.

Referenced by ff_blend_rectangle().

void ff_blend_rectangle	(	FFDrawContext *	draw,
		FFDrawColor *	color,
		uint8_t *	dst[],
		int	dst_linesize[],
		int	dst_w,
		int	dst_h,
		int	x0,
		int	y0,
		int	w,
		int	h
	)

Blend a rectangle with an uniform color.

Definition at line 348 of file drawutils.c.

Referenced by draw_text().

static void blend_pixel ( uint8_t *  dst, unsigned  src, unsigned  alpha, uint8_t *  mask, int  mask_linesize, int  l2depth, unsigned  w, unsigned  h, unsigned  shift, unsigned  xm0  )

static

Definition at line 398 of file drawutils.c.

Referenced by blend_line_hv().

static void blend_line_hv ( uint8_t *  dst, int  dst_delta, unsigned  src, unsigned  alpha, uint8_t *  mask, int  mask_linesize, int  l2depth, int  w, unsigned  hsub, unsigned  vsub, int  xm, int  left, int  right, int  hband  )

static

Definition at line 421 of file drawutils.c.

Referenced by ff_blend_mask().

void ff_blend_mask	(	FFDrawContext *	draw,
		FFDrawColor *	color,
		uint8_t *	dst[],
		int	dst_linesize[],
		int	dst_w,
		int	dst_h,
		uint8_t *	mask,
		int	mask_linesize,
		int	mask_w,
		int	mask_h,
		int	l2depth,
		unsigned	endianness,
		int	x0,
		int	y0
	)

Blend an alpha mask with an uniform color.

Parameters

draw	draw context
color	color for the overlay;
dst	destination image
dst_linesize	line stride of the destination
dst_w	width of the destination image
dst_h	height of the destination image
mask	mask
mask_linesize	line stride of the mask
mask_w	width of the mask
mask_h	height of the mask
l2depth	log2 of depth of the mask (0 for 1bpp, 3 for 8bpp)
endianness	bit order of the mask (0: MSB to the left)
x0	horizontal position of the overlay
y0	vertical position of the overlay

Definition at line 446 of file drawutils.c.

Referenced by draw_glyphs(), and overlay_ass_image().

int ff_draw_round_to_sub	(	FFDrawContext *	draw,
		int	sub_dir,
		int	round_dir,
		int	value
	)

Round a dimension according to subsampling.

Parameters

draw	draw context
sub_dir	0 for horizontal, 1 for vertical
round_dir	0 nearest, -1 round down, +1 round up
value	value to round

Returns

the rounded value

Definition at line 506 of file drawutils.c.

Referenced by config_input().

AVFilterFormats* ff_draw_supported_pixel_formats

(

unsigned

flags

)

Return the list of pixel formats supported by the draw functions.

The flags are the same as ff_draw_init, i.e., none currently.

Definition at line 518 of file drawutils.c.

Referenced by query_formats().