#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"

Include dependency graph for drawutils.c:

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. More...

void	ff_draw_color (FFDrawContext draw, FFDrawColor color, const uint8_t rgba[4])
	Prepare a color. More...

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. More...

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. More...

static void	clip_interval (int wmax, int x, int w, int *dx)
	Clip interval [x; x+w[ within [0; wmax[. More...

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. More...

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. More...

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. More...

int	ff_draw_round_to_sub (FFDrawContext *draw, int sub_dir, int round_dir, int value)
	Round a dimension according to subsampling. More...

AVFilterFormats *	ff_draw_supported_pixel_formats (unsigned flags)
	Return the list of pixel formats supported by the draw functions. More...

Enumeration Type Documentation

anonymous enum

Enumerator
RED
GREEN
BLUE
ALPHA

Definition at line 31 of file drawutils.c.

Function Documentation

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 309 of file drawutils.c.

Referenced by ff_blend_rectangle().

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 404 of file drawutils.c.

Referenced by ff_blend_mask().

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 381 of file drawutils.c.

Referenced by blend_line_hv().

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 270 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 301 of file drawutils.c.

Referenced by ff_blend_mask(), and ff_blend_rectangle().

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 429 of file drawutils.c.

Referenced by draw_glyphs(), and overlay_ass_image().

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 331 of file drawutils.c.

Referenced by draw_text().

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 115 of file drawutils.c.

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 214 of file drawutils.c.

Referenced by filter_frame().

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

Prepare a color.

Definition at line 179 of file drawutils.c.

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

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 135 of file drawutils.c.

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

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 95 of file drawutils.c.

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 489 of file drawutils.c.

Referenced by config_input(), and request_frame().

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 501 of file drawutils.c.

Referenced by query_formats(), and request_frame().

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 52 of file drawutils.c.

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 236 of file drawutils.c.

Referenced by draw_blank_frame(), filter_frame(), and request_frame().

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_output(), config_props(), ff_draw_color(), ff_fill_line_with_color(), and request_frame().

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

static

Definition at line 206 of file drawutils.c.

Referenced by ff_blend_mask(), ff_blend_rectangle(), ff_copy_rectangle2(), and ff_fill_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 289 of file drawutils.c.

Referenced by ff_blend_mask(), and ff_blend_rectangle().

Paris Hackday Code

Enumerations

Functions

Enumeration Type Documentation

Function Documentation