FFmpeg
blend_modes.c
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1 /*
2  * Copyright (c) 2013 Paul B Mahol
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include "libavutil/common.h"
22 #include "libavutil/intfloat.h"
23 #include "avfilter.h"
24 #include "internal.h"
25 #include "video.h"
26 #include "blend.h"
27 
28 #undef PIXEL
29 #undef MAX
30 #undef HALF
31 #undef CLIP
32 
33 #if DEPTH == 8
34 #define PIXEL uint8_t
35 #define MAX 255
36 #define HALF 128
37 #define CLIP(x) (av_clip_uint8(x))
38 #elif DEPTH == 32
39 #define PIXEL float
40 #define MAX 1.f
41 #define HALF 0.5f
42 #define CLIP(x) (x)
43 #else
44 #define PIXEL uint16_t
45 #define MAX ((1 << DEPTH) - 1)
46 #define HALF (1 << (DEPTH - 1))
47 #define CLIP(x) ((int)av_clip_uintp2(x, DEPTH))
48 #endif
49 
50 #undef MULTIPLY
51 #undef SCREEN
52 #undef BURN
53 #undef DODGE
54 #undef GEOMETRIC
55 #undef INT2FLOAT
56 #undef FLOAT2INT
57 #undef MDIV
58 #undef LRINTF
59 
60 #if DEPTH < 32
61 #define MULTIPLY(x, a, b) ((x) * (((a) * (b)) / MAX))
62 #define SCREEN(x, a, b) (MAX - (x) * ((MAX - (a)) * (MAX - (b)) / MAX))
63 #define BURN(a, b) (((a) == 0) ? (a) : FFMAX(0, MAX - ((MAX - (b)) << DEPTH) / (a)))
64 #define DODGE(a, b) (((a) == MAX) ? (a) : FFMIN(MAX, (((b) << DEPTH) / (MAX - (a)))))
65 #define GEOMETRIC(a, b) (lrintf(sqrtf((unsigned)A * B)))
66 #define INT2FLOAT(x) (x)
67 #define FLOAT2INT(x) (x)
68 #define MDIV (0.125f * (1 << DEPTH))
69 #define LRINTF(x) lrintf(x)
70 #else
71 #define MULTIPLY(x, a, b) ((x) * (((a) * (b)) / 1.0))
72 #define SCREEN(x, a, b) (1.0 - (x) * ((1.0 - (a)) * (1.0 - (b)) / 1.0))
73 #define BURN(a, b) (((a) <= 0.0) ? (a) : FFMAX(0.0, 1.0 - (1.0 - (b)) / (a)))
74 #define DODGE(a, b) (((a) >= 1.0) ? (a) : FFMIN(1.0, ((b) / (1.0 - (a)))))
75 #define GEOMETRIC(a, b) (sqrtf(fmaxf(A, 0) * fmaxf(B, 0)))
76 #define INT2FLOAT(x) av_int2float(x)
77 #define FLOAT2INT(x) av_float2int(x)
78 #define MDIV 0.125f
79 #define LRINTF(x) (x)
80 #endif
81 
82 #define A top[j]
83 #define B bottom[j]
84 
85 #define fn2(a, b) blend_##a##_##b##bit
86 #define fn1(name, depth) fn2(name, depth)
87 #define fn0(name) fn1(name, DEPTH)
88 
89 #define fn(NAME, EXPR) \
90 static void fn0(NAME)(const uint8_t *_top, ptrdiff_t top_linesize, \
91  const uint8_t *_bottom, ptrdiff_t bottom_linesize, \
92  uint8_t *_dst, ptrdiff_t dst_linesize, \
93  ptrdiff_t width, ptrdiff_t height, \
94  FilterParams *param, double *values, int starty) \
95 { \
96  const PIXEL *top = (const PIXEL *)_top; \
97  const PIXEL *bottom = (const PIXEL *)_bottom; \
98  PIXEL *dst = (PIXEL *)_dst; \
99  const float opacity = param->opacity; \
100  \
101  dst_linesize /= sizeof(PIXEL); \
102  top_linesize /= sizeof(PIXEL); \
103  bottom_linesize /= sizeof(PIXEL); \
104  \
105  for (int i = 0; i < height; i++) { \
106  for (int j = 0; j < width; j++) { \
107  dst[j] = top[j] + ((EXPR)-top[j]) * opacity; \
108  } \
109  dst += dst_linesize; \
110  top += top_linesize; \
111  bottom += bottom_linesize; \
112  } \
113 }
114 
115 fn(addition, FFMIN(MAX, A + B))
116 fn(grainmerge, CLIP(A + B - HALF))
117 fn(average, (A + B) / 2)
118 fn(subtract, FFMAX(0, A - B))
119 fn(multiply, MULTIPLY(1, A, B))
120 fn(multiply128,CLIP((A - HALF) * B / MDIV + HALF))
121 fn(negation, MAX - FFABS(MAX - A - B))
122 fn(extremity, FFABS(MAX - A - B))
123 fn(difference, FFABS(A - B))
124 fn(grainextract, CLIP(HALF + A - B))
125 fn(screen, SCREEN(1, A, B))
126 fn(overlay, (A < HALF) ? MULTIPLY(2, A, B) : SCREEN(2, A, B))
127 fn(hardlight, (B < HALF) ? MULTIPLY(2, B, A) : SCREEN(2, B, A))
128 fn(hardmix, (A < (MAX - B)) ? 0: MAX)
129 fn(heat, (A == 0) ? 0 : MAX - FFMIN(((MAX - B) * (MAX - B)) / A, MAX))
130 fn(freeze, (B == 0) ? 0 : MAX - FFMIN(((MAX - A) * (MAX - A)) / B, MAX))
131 fn(darken, FFMIN(A, B))
132 fn(lighten, FFMAX(A, B))
133 fn(divide, CLIP(B == 0 ? MAX : MAX * A / B))
134 fn(dodge, DODGE(A, B))
135 fn(burn, BURN(A, B))
136 fn(softlight, CLIP(A * A / MAX + (2 * (B * ((A * (MAX - A)) / MAX) / MAX))))
137 fn(exclusion, A + B - 2 * A * B / MAX)
138 fn(pinlight, (B < HALF) ? FFMIN(A, 2 * B) : FFMAX(A, 2 * (B - HALF)))
139 fn(phoenix, FFMIN(A, B) - FFMAX(A, B) + MAX)
140 fn(reflect, (B == MAX) ? B : FFMIN(MAX, (A * A / (MAX - B))))
141 fn(glow, (A == MAX) ? A : FFMIN(MAX, (B * B / (MAX - A))))
142 fn(and, INT2FLOAT(FLOAT2INT(A) & FLOAT2INT(B)))
143 fn(or, INT2FLOAT(FLOAT2INT(A) | FLOAT2INT(B)))
144 fn(xor, INT2FLOAT(FLOAT2INT(A) ^ FLOAT2INT(B)))
145 fn(vividlight, (A < HALF) ? BURN(2 * A, B) : DODGE(2 * (A - HALF), B))
146 fn(linearlight,CLIP((B < HALF) ? B + 2 * A - MAX : B + 2 * (A - HALF)))
147 fn(softdifference,CLIP((A > B) ? (B == MAX) ? 0 : (A - B) * MAX / (MAX - B) : (B == 0) ? 0 : (B - A) * MAX / B))
148 fn(geometric, GEOMETRIC(A, B))
149 fn(harmonic, A == 0 && B == 0 ? 0 : 2LL * A * B / (A + B))
150 fn(bleach, (MAX - B) + (MAX - A) - MAX)
151 fn(stain, 2 * MAX - A - B)
152 fn(interpolate,LRINTF(MAX * (2 - cosf(A * M_PI / MAX) - cosf(B * M_PI / MAX)) * 0.25f))
153 fn(hardoverlay,A == MAX ? MAX : FFMIN(MAX, MAX * B / (2 * MAX - 2 * A) * (A > HALF) + 2 * A * B / MAX * (A <= HALF)))
BURN
#define BURN(a, b)
Definition: blend_modes.c:63
GEOMETRIC
#define GEOMETRIC(a, b)
Definition: blend_modes.c:65
MAX
#define MAX
Definition: blend_modes.c:45
A
#define A
Definition: blend_modes.c:82
INT2FLOAT
#define INT2FLOAT(x)
Definition: blend_modes.c:66
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
intfloat.h
video.h
cosf
#define cosf(x)
Definition: libm.h:78
MULTIPLY
#define MULTIPLY(x, a, b)
Definition: blend_modes.c:61
multiply
static SoftFloat_IEEE754 multiply(SoftFloat_IEEE754 a, SoftFloat_IEEE754 b)
multiply two softfloats and handle the rounding off
Definition: alsdec.c:1398
FFABS
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:65
B
#define B
Definition: blend_modes.c:83
difference
static void difference(IPlane *g, IPlane *f, int y0, int y1)
Definition: vf_morpho.c:494
HALF
#define HALF
Definition: blend_modes.c:46
fn
#define fn(NAME, EXPR)
Definition: blend_modes.c:89
f
f
Definition: af_crystalizer.c:121
DODGE
#define DODGE(a, b)
Definition: blend_modes.c:64
interpolate
static void interpolate(float *out, float v1, float v2, int size)
Definition: twinvq.c:84
M_PI
#define M_PI
Definition: mathematics.h:67
internal.h
common.h
blend.h
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
CLIP
#define CLIP(x)
Definition: blend_modes.c:47
FLOAT2INT
#define FLOAT2INT(x)
Definition: blend_modes.c:67
avfilter.h
LRINTF
#define LRINTF(x)
Definition: blend_modes.c:69
SCREEN
#define SCREEN(x, a, b)
Definition: blend_modes.c:62
MDIV
#define MDIV
Definition: blend_modes.c:68
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