blend_modes.c File Reference

#include "libavutil/common.h"
#include "libavutil/intfloat.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
#include "blend.h"

Go to the source code of this file.

Macros
#define	PIXEL   uint16_t
#define	MAX   ((1 << DEPTH) - 1)
#define	HALF   (1 << (DEPTH - 1))
#define	CLIP(x)   ((int)av_clip_uintp2(x, DEPTH))
#define	MULTIPLY(x, a, b)   ((x) * (((a) * (b)) / MAX))
#define	SCREEN(x, a, b)   (MAX - (x) * ((MAX - (a)) * (MAX - (b)) / MAX))
#define	BURN(a, b)   (((a) == 0) ? (a) : FFMAX(0, MAX - ((MAX - (b)) << DEPTH) / (a)))
#define	DODGE(a, b)   (((a) == MAX) ? (a) : FFMIN(MAX, (((b) << DEPTH) / (MAX - (a)))))
#define	GEOMETRIC(a, b)   (lrintf(sqrtf((unsigned)A * B)))
#define	INT2FLOAT(x)   (x)
#define	FLOAT2INT(x)   (x)
#define	MDIV   (0.125f * (1 << DEPTH))
#define	A   top[j]
#define	B   bottom[j]
#define	fn2(a, b)   blend_##a##_##b##bit
#define	fn1(name, depth)   fn2(name, depth)
#define	fn0(name)   fn1(name, DEPTH)
#define	fn(NAME, EXPR)

Macro Definition Documentation

PIXEL

#define PIXEL   uint16_t

Definition at line 45 of file blend_modes.c.

MAX

#define MAX   ((1 << DEPTH) - 1)

Definition at line 46 of file blend_modes.c.

HALF

#define HALF   (1 << (DEPTH - 1))

Definition at line 47 of file blend_modes.c.

CLIP

#define CLIP

(

x

)

((int)av_clip_uintp2(x, DEPTH))

Definition at line 48 of file blend_modes.c.

MULTIPLY

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

Definition at line 61 of file blend_modes.c.

SCREEN

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

Definition at line 62 of file blend_modes.c.

BURN

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

Definition at line 63 of file blend_modes.c.

DODGE

#define DODGE	(		a,
			b
	)		(((a) == MAX) ? (a) : FFMIN(MAX, (((b) << DEPTH) / (MAX - (a)))))

Definition at line 64 of file blend_modes.c.

GEOMETRIC

#define GEOMETRIC	(		a,
			b
	)		(lrintf(sqrtf((unsigned)A * B)))

Definition at line 65 of file blend_modes.c.

INT2FLOAT

#define INT2FLOAT

(

x

)

(x)

Definition at line 66 of file blend_modes.c.

FLOAT2INT

#define FLOAT2INT

(

x

)

(x)

Definition at line 67 of file blend_modes.c.

MDIV

#define MDIV   (0.125f * (1 << DEPTH))

Definition at line 68 of file blend_modes.c.

A

#define A   top[j]

Definition at line 80 of file blend_modes.c.

B

#define B   bottom[j]

Definition at line 81 of file blend_modes.c.

fn2

#define fn2	(		a,
			b
	)		blend_##a##_##b##bit

Definition at line 83 of file blend_modes.c.

fn1

#define fn1	(		name,
			depth
	)		fn2(name, depth)

Definition at line 84 of file blend_modes.c.

fn0

#define fn0

(

name

)

fn1(name, DEPTH)

Definition at line 85 of file blend_modes.c.

fn

#define fn	(		NAME,
			EXPR
	)

Value:

static void fn0(NAME)(const uint8_t *_top, ptrdiff_t top_linesize, \
     const uint8_t *_bottom, ptrdiff_t bottom_linesize,       \
     uint8_t *_dst, ptrdiff_t dst_linesize,                   \
     ptrdiff_t width, ptrdiff_t height,                       \
     FilterParams *param, double *values, int starty)         \
{                                                                                   \
    const PIXEL *top = (PIXEL *)_top;                                               \
    const PIXEL *bottom = (PIXEL *)_bottom;                                         \
    PIXEL *dst = (PIXEL *)_dst;                                                     \
    const float opacity = param->opacity;                                           \
                                                                                    \
    dst_linesize /= sizeof(PIXEL);                                                  \
    top_linesize /= sizeof(PIXEL);                                                  \
    bottom_linesize /= sizeof(PIXEL);                                               \
                                                                                    \
    for (int i = 0; i < height; i++) {                                              \
        for (int 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 87 of file blend_modes.c.