/* * 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 "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, SliceParams *sliceparam)            \{                                                                                   \    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)))