Add glow effects - blind - suckless command-line video editing utility
HTML git clone git://git.suckless.org/blind
DIR Log
DIR Files
DIR Refs
DIR README
DIR LICENSE
---
DIR commit 5ba5815d0a7255f311cdc66251774e6e36854e8f
DIR parent eebc4d5fb9cf6d78cbdba7a5aa9be713ddf9959c
HTML Author: Mattias Andrée <maandree@kth.se>
Date: Wed, 26 Jul 2017 19:25:28 +0200
Add glow effects
Signed-off-by: Mattias Andrée <maandree@kth.se>
Diffstat:
M TODO | 2 +-
M man/blind-gauss-blur.1 | 9 +++++++--
M man/blind-kernel.1 | 8 ++++++--
M src/blind-gauss-blur.c | 33 ++++++++++++++++++++++++++++++-
M src/blind-kernel.c | 11 ++++++++---
5 files changed, 54 insertions(+), 9 deletions(-)
---
DIR diff --git a/TODO b/TODO
@@ -43,7 +43,7 @@ blind-from-video: add options to:
blind-cone-gradient: add ability to make gradient superelliptic
-Add [-j jobs] to blind-from-video and blind-to-video.
+Add [-j jobs] to blind-from-video, blind-to-video, and blind-apply-kernel.
long double is slightly faster than long.
long double (xyza q) could be added as another format.
DIR diff --git a/man/blind-gauss-blur.1 b/man/blind-gauss-blur.1
@@ -10,7 +10,7 @@ blind-gauss-blur - Apply Gaussian blur to a video
|
-s
.RB ' auto ']
-[-achvy]
+[-acghvy]
.I sd-stream
.SH DESCRIPTION
.B blind-gauss-blur
@@ -45,6 +45,9 @@ video is opaque.
.B -c
Blur the chroma only, not the luma.
.TP
+.B -g
+Add glow effect.
+.TP
.B -h
Blur horizontally only. Has no affect if -v is also
specified.
@@ -75,7 +78,9 @@ as the standard deviation all channels.
.SH REQUIREMENTS
.B blind-gauss-blur
requires enough free memory to load three full frames into
-memory. A frame requires 32 bytes per pixel it contains.
+memory. A frame requires 32 bytes per pixel it contains. If
+.B -g
+is used, four full frames are required.
.SH SEE ALSO
.BR blind (7),
.BR blind-single-colour (1),
DIR diff --git a/man/blind-kernel.1 b/man/blind-kernel.1
@@ -61,12 +61,16 @@ is specified,
.B SE
is used.
.TP
-.RI \fBgaussian\fP\ [-s\ spread ]\ [-u]\ standard-deviation
+.RI \fBgaussian\fP\ [-s\ spread ]\ [-g\ |\ -u]\ standard-deviation
Creates a Gaussian blur kernel with the standard deviation
.IR standard-deviation .
If
.B -u
-is used, the a Gaussian unsharpen kernel is created. If
+is used, the a Gaussian unsharpen kernel is created.
+If
+.B -g
+is used, the a Gaussian blur kernel with glow effect is created.
+If
.B -s
is specified, the specified
.I spread
DIR diff --git a/src/blind-gauss-blur.c b/src/blind-gauss-blur.c
@@ -1,16 +1,18 @@
/* See LICENSE file for copyright and license details. */
#include "common.h"
-USAGE("[-j jobs] [-s spread | -s 'auto'] [-achvy] sd-stream")
+USAGE("[-j jobs] [-s spread | -s 'auto'] [-acghvy] sd-stream")
static int chroma = 0;
static int noalpha = 0;
+static int glow = 0;
static int vertical = 0;
static int horizontal = 0;
static int measure_y_only = 0;
static int auto_spread = 0;
static size_t jobs = 1;
static size_t spread = 0;
+static void *original = NULL;
/*
* This is not a regular simple gaussian blur implementation.
@@ -126,6 +128,7 @@ static size_t spread = 0;
\
pixel_t *restrict clr = (pixel_t *)cbuf;\
pixel_t *restrict sig = (pixel_t *)sbuf;\
+ pixel_t *restrict orig = original;\
pixel_t *img = (pixel_t *)output;\
pixel_t c, k;\
size_t x1, y1, i1, x2, y2, i2;\
@@ -139,6 +142,8 @@ static size_t spread = 0;
x2end = colour->width;\
y2end = colour->height;\
\
+ if (glow)\
+ memcpy(orig, clr, colour->frame_size);\
if (chroma || !noalpha) {\
start = 0, end = colour->height;\
is_master = efork_jobs(&start, &end, jobs, &children);\
@@ -155,6 +160,12 @@ static size_t spread = 0;
}\
}\
\
+ /* store original image */\
+ if (glow) {\
+ i1 = start * colour->width;\
+ memcpy(orig + i1, clr + i1, (end - start) * colour->width * sizeof(*clr));\
+ }\
+ \
/* convert colour model */\
if (chroma) {\
i1 = start * colour->width;\
@@ -247,6 +258,19 @@ static size_t spread = 0;
}\
}\
\
+ /* apply glow */\
+ if (glow) {\
+ i1 = start * colour->width;\
+ for (y1 = start; y1 < end; y1++) {\
+ for (x1 = 0; x1 < colour->width; x1++, i1++) {\
+ img[i1][0] = 1 - (1 - img[i1][0]) * (1 - orig[i1][0]);\
+ img[i1][1] = 1 - (1 - img[i1][1]) * (1 - orig[i1][1]);\
+ img[i1][2] = 1 - (1 - img[i1][2]) * (1 - orig[i1][2]);\
+ img[i1][3] = 1 - (1 - img[i1][3]) * (1 - orig[i1][3]);\
+ }\
+ }\
+ }\
+ \
/* unpremultiply alpha channel */\
i1 = start * colour->width;\
for (y1 = start; y1 < end; y1++) {\
@@ -301,6 +325,9 @@ main(int argc, char *argv[])
case 'c':
chroma = 1;
break;
+ case 'g':
+ glow = 1;
+ break;
case 'h':
horizontal = 1;
break;
@@ -340,8 +367,12 @@ main(int argc, char *argv[])
if (jobs > colour.height)
jobs = colour.height;
+ if (glow)
+ original = emalloc(colour.frame_size);
+
fprint_stream_head(stdout, &colour);
efflush(stdout, "<stdout>");
process_each_frame_two_streams(&colour, &sigma, STDOUT_FILENO, "<stdout>", process);
+ free(original);
return 0;
}
DIR diff --git a/src/blind-kernel.c b/src/blind-kernel.c
@@ -223,13 +223,16 @@ kernel_gaussian(int argc, char *argv[], size_t *rows, size_t *cols, double **fre
{
size_t spread = 0, y, x;
ssize_t xx, yy;
- int unsharpen = 0;
+ int unsharpen = 0, glow = 0;
double sigma, value, c, k;
char *arg;
#define argv0 arg
argc++, argv--;
ARGBEGIN {
+ case 'g':
+ glow = 1;
+ break;
case 's':
if (!(arg = ARGF()))
goto usage;
@@ -243,7 +246,7 @@ kernel_gaussian(int argc, char *argv[], size_t *rows, size_t *cols, double **fre
} ARGEND;
#undef argv0
- if (argc != 1)
+ if (argc != 1 || (unsharpen && glow))
goto usage;
sigma = etolf_arg("standard-deviation", argv[0]);
@@ -270,11 +273,13 @@ kernel_gaussian(int argc, char *argv[], size_t *rows, size_t *cols, double **fre
if (unsharpen)
(*free_this)[spread * *cols + spread] -= 2.0;
+ if (glow)
+ (*free_this)[spread * *cols + spread] += 1;
return *free_this;
usage:
- eprintf(SUBUSAGE("'gaussian' [-s spread] [-u] standard-deviation"));
+ eprintf(SUBUSAGE("'gaussian' [-s spread] [-g | -u] standard-deviation"));
return NULL;
}