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FFmpeg/libavfilter/blend_modes.c
Andreas Rheinhardt 44dcc4d606 avfilter/blend_modes: Always preserve constness 
These casts cast const away temporarily; they are safe, because
the pointers that are initialized point to const data. But this
is nevertheless not nice and leads to warnings when using
-Wcast-qual. blend_modes.c generates 546 (2*39*7) such warnings
which is the majority of such warnings for FFmpeg as a whole.
vf_blend.c and vf_blend_init.h also use this pattern;
they have also been changed.

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2023-09-07 20:58:00 +02:00

154 lines
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C
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/*
* Copyright (c) 2013 Paul B Mahol
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/common.h"
#include "libavutil/intfloat.h"
#include "avfilter.h"
#include "internal.h"
#include "video.h"
#include "blend.h"
#undef PIXEL
#undef MAX
#undef HALF
#undef CLIP
#if DEPTH == 8
#define PIXEL uint8_t
#define MAX 255
#define HALF 128
#define CLIP(x) (av_clip_uint8(x))
#elif DEPTH == 32
#define PIXEL float
#define MAX 1.f
#define HALF 0.5f
#define CLIP(x) (x)
#else
#define PIXEL uint16_t
#define MAX ((1 << DEPTH) - 1)
#define HALF (1 << (DEPTH - 1))
#define CLIP(x) ((int)av_clip_uintp2(x, DEPTH))
#endif
#undef MULTIPLY
#undef SCREEN
#undef BURN
#undef DODGE
#undef GEOMETRIC
#undef INT2FLOAT
#undef FLOAT2INT
#undef MDIV
#undef LRINTF
#if DEPTH < 32
#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 LRINTF(x) lrintf(x)
#else
#define MULTIPLY(x, a, b) ((x) * (((a) * (b)) / 1.0))
#define SCREEN(x, a, b) (1.0 - (x) * ((1.0 - (a)) * (1.0 - (b)) / 1.0))
#define BURN(a, b) (((a) <= 0.0) ? (a) : FFMAX(0.0, 1.0 - (1.0 - (b)) / (a)))
#define DODGE(a, b) (((a) >= 1.0) ? (a) : FFMIN(1.0, ((b) / (1.0 - (a)))))
#define GEOMETRIC(a, b) (sqrtf(fmaxf(A, 0) * fmaxf(B, 0)))
#define INT2FLOAT(x) av_int2float(x)
#define FLOAT2INT(x) av_float2int(x)
#define MDIV 0.125f
#define LRINTF(x) (x)
#endif
#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) \
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 = (const PIXEL *)_top; \
const PIXEL *bottom = (const 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; \
} \
}
fn(addition, FFMIN(MAX, A + B))
fn(grainmerge, CLIP(A + B - HALF))
fn(average, (A + B) / 2)
fn(subtract, FFMAX(0, A - B))
fn(multiply, MULTIPLY(1, A, B))
fn(multiply128,CLIP((A - HALF) * B / MDIV + HALF))
fn(negation, MAX - FFABS(MAX - A - B))
fn(extremity, FFABS(MAX - A - B))
fn(difference, FFABS(A - B))
fn(grainextract, CLIP(HALF + A - B))
fn(screen, SCREEN(1, A, B))
fn(overlay, (A < HALF) ? MULTIPLY(2, A, B) : SCREEN(2, A, B))
fn(hardlight, (B < HALF) ? MULTIPLY(2, B, A) : SCREEN(2, B, A))
fn(hardmix, (A < (MAX - B)) ? 0: MAX)
fn(heat, (A == 0) ? 0 : MAX - FFMIN(((MAX - B) * (MAX - B)) / A, MAX))
fn(freeze, (B == 0) ? 0 : MAX - FFMIN(((MAX - A) * (MAX - A)) / B, MAX))
fn(darken, FFMIN(A, B))
fn(lighten, FFMAX(A, B))
fn(divide, CLIP(B == 0 ? MAX : MAX * A / B))
fn(dodge, DODGE(A, B))
fn(burn, BURN(A, B))
fn(softlight, CLIP(A * A / MAX + (2 * (B * ((A * (MAX - A)) / MAX) / MAX))))
fn(exclusion, A + B - 2 * A * B / MAX)
fn(pinlight, (B < HALF) ? FFMIN(A, 2 * B) : FFMAX(A, 2 * (B - HALF)))
fn(phoenix, FFMIN(A, B) - FFMAX(A, B) + MAX)
fn(reflect, (B == MAX) ? B : FFMIN(MAX, (A * A / (MAX - B))))
fn(glow, (A == MAX) ? A : FFMIN(MAX, (B * B / (MAX - A))))
fn(and, INT2FLOAT(FLOAT2INT(A) & FLOAT2INT(B)))
fn(or, INT2FLOAT(FLOAT2INT(A) | FLOAT2INT(B)))
fn(xor, INT2FLOAT(FLOAT2INT(A) ^ FLOAT2INT(B)))
fn(vividlight, (A < HALF) ? BURN(2 * A, B) : DODGE(2 * (A - HALF), B))
fn(linearlight,CLIP((B < HALF) ? B + 2 * A - MAX : B + 2 * (A - HALF)))
fn(softdifference,CLIP((A > B) ? (B == MAX) ? 0 : (A - B) * MAX / (MAX - B) : (B == 0) ? 0 : (B - A) * MAX / B))
fn(geometric, GEOMETRIC(A, B))
fn(harmonic, A == 0 && B == 0 ? 0 : 2LL * A * B / (A + B))
fn(bleach, (MAX - B) + (MAX - A) - MAX)
fn(stain, 2 * MAX - A - B)
fn(interpolate,LRINTF(MAX * (2 - cosf(A * M_PI / MAX) - cosf(B * M_PI / MAX)) * 0.25f))
fn(hardoverlay,A == MAX ? MAX : FFMIN(MAX, MAX * B / (2 * MAX - 2 * A) * (A > HALF) + 2 * A * B / MAX * (A <= HALF)))
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