vf_blend.c File Reference

#include "libavutil/imgutils.h"
#include "libavutil/eval.h"
#include "libavutil/opt.h"
#include "libavutil/pixfmt.h"
#include "avfilter.h"
#include "bufferqueue.h"
#include "formats.h"
#include "internal.h"
#include "dualinput.h"
#include "video.h"

Go to the source code of this file.

Data Structures
struct	FilterParams
	filter data More...
struct	ThreadData
struct	BlendContext

Macros
#define	TOP   0
#define	BOTTOM   1
#define	COMMON_OPTIONS
#define	OFFSET(x)   offsetof(BlendContext, x)
#define	FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
#define	DEFINE_BLEND(name, expr)
#define	A   top[j]
#define	B   bottom[j]
#define	MULTIPLY(x, a, b)   ((x) * (((a) * (b)) / 255))
#define	SCREEN(x, a, b)   (255 - (x) * ((255 - (a)) * (255 - (b)) / 255))
#define	BURN(a, b)   (((a) == 0) ? (a) : FFMAX(0, 255 - ((255 - (b)) << 8) / (a)))
#define	DODGE(a, b)   (((a) == 255) ? (a) : FFMIN(255, (((b) << 8) / (255 - (a)))))

Enumerations
enum	BlendMode {   BLEND_UNSET = -1, BLEND_NORMAL, BLEND_ADDITION, BLEND_AND,   BLEND_AVERAGE, BLEND_BURN, BLEND_DARKEN, BLEND_DIFFERENCE,   BLEND_DIFFERENCE128, BLEND_DIVIDE, BLEND_DODGE, BLEND_EXCLUSION,   BLEND_HARDLIGHT, BLEND_LIGHTEN, BLEND_MULTIPLY, BLEND_NEGATION,   BLEND_OR, BLEND_OVERLAY, BLEND_PHOENIX, BLEND_PINLIGHT,   BLEND_REFLECT, BLEND_SCREEN, BLEND_SOFTLIGHT, BLEND_SUBTRACT,   BLEND_VIVIDLIGHT, BLEND_XOR, BLEND_HARDMIX, BLEND_LINEARLIGHT,   BLEND_GLOW, BLEND_NB }
enum	{   VAR_X, VAR_Y, VAR_W, VAR_H,   VAR_SW, VAR_SH, VAR_T, VAR_N,   VAR_A, VAR_B, VAR_TOP, VAR_BOTTOM,   VAR_VARS_NB }

Functions
	AVFILTER_DEFINE_CLASS (blend)
static void	blend_normal (const uint8_t *top, int top_linesize, const uint8_t *bottom, int bottom_linesize, uint8_t *dst, int dst_linesize, int width, int start, int end, FilterParams *param, double *values)
	DEFINE_BLEND (overlay,(A< 128)?MULTIPLY(2, A, B):SCREEN(2, A, B))
static int	filter_slice (AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
static AVFrame *	blend_frame (AVFilterContext *ctx, AVFrame *top_buf, const AVFrame *bottom_buf)
static av_cold int	init (AVFilterContext *ctx)
static int	query_formats (AVFilterContext *ctx)
static av_cold void	uninit (AVFilterContext *ctx)

Variables
static const char *const	var_names [] = { "X", "Y", "W", "H", "SW", "SH", "T", "N", "A", "B", "TOP", "BOTTOM", NULL }
static const AVOption	blend_options []

Macro Definition Documentation

#define TOP   0

Definition at line 32 of file vf_blend.c.

#define BOTTOM   1

Definition at line 33 of file vf_blend.c.

#define COMMON_OPTIONS

Definition at line 106 of file vf_blend.c.

#define OFFSET

(

x

)

offsetof(BlendContext, x)

Definition at line 151 of file vf_blend.c.

#define FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

Definition at line 152 of file vf_blend.c.

#define DEFINE_BLEND	(		name,
			expr
	)

Value:

static void blend_## name(const uint8_t *top, int top_linesize,       \
                          const uint8_t *bottom, int bottom_linesize, \
                          uint8_t *dst, int dst_linesize,             \
                          int width, int start, int end,              \
                          FilterParams *param, double *values)        \
{                                                                     \
    double opacity = param->opacity;                                  \
    int i, j;                                                         \
                                                                      \
    for (i = start; i < end; i++) {                                   \
        for (j = 0; j < width; j++) {                                 \
            dst[j] = top[j] + ((expr) - top[j]) * opacity;            \
        }                                                             \
        dst    += dst_linesize;                                       \
        top    += top_linesize;                                       \
        bottom += bottom_linesize;                                    \
    }                                                                 \
}

Definition at line 172 of file vf_blend.c.

#define A   top[j]

Definition at line 192 of file vf_blend.c.

#define B   bottom[j]

Definition at line 193 of file vf_blend.c.

#define MULTIPLY	(		x,
			a,
			b
	)		((x) * (((a) * (b)) / 255))

Definition at line 195 of file vf_blend.c.

#define SCREEN	(		x,
			a,
			b
	)		(255 - (x) * ((255 - (a)) * (255 - (b)) / 255))

Definition at line 196 of file vf_blend.c.

#define BURN	(		a,
			b
	)		(((a) == 0) ? (a) : FFMAX(0, 255 - ((255 - (b)) << 8) / (a)))

Definition at line 197 of file vf_blend.c.

#define DODGE	(		a,
			b
	)		(((a) == 255) ? (a) : FFMIN(255, (((b) << 8) / (255 - (a)))))

Definition at line 198 of file vf_blend.c.

Enumeration Type Documentation

enum BlendMode

Enumerator
BLEND_UNSET
BLEND_NORMAL
BLEND_ADDITION
BLEND_AND
BLEND_AVERAGE
BLEND_BURN
BLEND_DARKEN
BLEND_DIFFERENCE
BLEND_DIFFERENCE128
BLEND_DIVIDE
BLEND_DODGE
BLEND_EXCLUSION
BLEND_HARDLIGHT
BLEND_LIGHTEN
BLEND_MULTIPLY
BLEND_NEGATION
BLEND_OR
BLEND_OVERLAY
BLEND_PHOENIX
BLEND_PINLIGHT
BLEND_REFLECT
BLEND_SCREEN
BLEND_SOFTLIGHT
BLEND_SUBTRACT
BLEND_VIVIDLIGHT
BLEND_XOR
BLEND_HARDMIX
BLEND_LINEARLIGHT
BLEND_GLOW
BLEND_NB

Definition at line 35 of file vf_blend.c.

anonymous enum

Enumerator
VAR_X
VAR_Y
VAR_W
VAR_H
VAR_SW
VAR_SH
VAR_T
VAR_N
VAR_A
VAR_B
VAR_TOP
VAR_BOTTOM
VAR_VARS_NB

Definition at line 69 of file vf_blend.c.

Function Documentation

AVFILTER_DEFINE_CLASS

(

blend

)

static void blend_normal ( const uint8_t *  top, int  top_linesize, const uint8_t *  bottom, int  bottom_linesize, uint8_t *  dst, int  dst_linesize, int  width, int  start, int  end, FilterParams *  param, double *  values  )

static

Definition at line 163 of file vf_blend.c.

Referenced by init().

DEFINE_BLEND	(	overlay	,
		(A< 128)?MULTIPLY(2, A, B):SCREEN(2, A, B)
	)

Definition at line 208 of file vf_blend.c.

static int filter_slice ( AVFilterContext *  ctx, void *  arg, int  jobnr, int  nb_jobs  )

static

Definition at line 251 of file vf_blend.c.

Referenced by blend_frame().

static AVFrame* blend_frame ( AVFilterContext *  ctx, AVFrame *  top_buf, const AVFrame *  bottom_buf  )

static

Definition at line 278 of file vf_blend.c.

Referenced by init().

static av_cold int init ( AVFilterContext *  ctx )

static

Definition at line 311 of file vf_blend.c.

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 375 of file vf_blend.c.

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 390 of file vf_blend.c.

Variable Documentation

const char* const var_names[] = { "X", "Y", "W", "H", "SW", "SH", "T", "N", "A", "B", "TOP", "BOTTOM", NULL }

static

Definition at line 68 of file vf_blend.c.

Referenced by init().

const AVOption blend_options[]

static

Initial value:

= {
    COMMON_OPTIONS,
    { "shortest",    "force termination when the shortest input terminates", OFFSET(dinput.shortest), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS },
    { "repeatlast",  "repeat last bottom frame", OFFSET(dinput.repeatlast), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS },
    { NULL }
}

Definition at line 154 of file vf_blend.c.