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avfilter/vf_fillborders: add fade mode

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This commit is contained in:
Paul B Mahol 2020-12-18 23:06:56 +01:00
parent 962040ad91
commit 50a9210739
2 changed files with 101 additions and 3 deletions
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5
doc/filters.texi
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@ -11766,12 +11766,15 @@ fill pixels using reflecting (whole sample symmetric)
@item wrap
fill pixels using wrapping
@item fade
fade pixels to constant value
@end table
Default is @var{smear}.
@item color
Set color for pixels in fixed mode. Default is @var{black}.
Set color for pixels in fixed or fade mode. Default is @var{black}.
@end table
@subsection Commands

99
libavfilter/vf_fillborders.c
View File

@ -32,7 +32,7 @@
enum { Y, U, V, A };
enum { R, G, B };
enum FillMode { FM_SMEAR, FM_MIRROR, FM_FIXED, FM_REFLECT, FM_WRAP, FM_NB_MODES };
enum FillMode { FM_SMEAR, FM_MIRROR, FM_FIXED, FM_REFLECT, FM_WRAP, FM_FADE, FM_NB_MODES };
typedef struct Borders {
int left, right, top, bottom;
@ -402,6 +402,99 @@ static void wrap_borders16(FillBordersContext *s, AVFrame *frame)
}
}
static int lerp8(int fill, int src, int pos, int size)
{
return av_clip_uint8(((fill * 256 * pos / size) + (src * 256 * (size - pos) / size)) >> 8);
}
static int lerp16(int fill, int src, int pos, int size, int depth)
{
return av_clip_uintp2_c(((fill * (1LL << depth) * pos / size) + (src * (1LL << depth) * (size - pos) / size)) >> depth, depth);
}
static void fade_borders8(FillBordersContext *s, AVFrame *frame)
{
int p, y, x;
for (p = 0; p < s->nb_planes; p++) {
uint8_t *ptr = frame->data[p];
const uint8_t fill = s->fill[p];
const int linesize = frame->linesize[p];
const int start_left = s->borders[p].left;
const int start_right = s->planewidth[p] - s->borders[p].right;
const int start_top = s->borders[p].top;
const int start_bottom = s->planeheight[p] - s->borders[p].bottom;
for (y = 0; y < start_top; y++) {
for (x = 0; x < s->planewidth[p]; x++) {
int src = ptr[y * linesize + x];
ptr[y * linesize + x] = lerp8(fill, src, start_top - y, start_top);
}
}
for (y = start_bottom; y < s->planeheight[p]; y++) {
for (x = 0; x < s->planewidth[p]; x++) {
int src = ptr[y * linesize + x];
ptr[y * linesize + x] = lerp8(fill, src, y - start_bottom, s->borders[p].bottom);
}
}
for (y = 0; y < s->planeheight[p]; y++) {
for (x = 0; x < start_left; x++) {
int src = ptr[y * linesize + x];
ptr[y * linesize + x] = lerp8(fill, src, start_left - x, start_left);
}
for (x = 0; x < s->borders[p].right; x++) {
int src = ptr[y * linesize + start_right + x];
ptr[y * linesize + start_right + x] = lerp8(fill, src, x, s->borders[p].right);
}
}
}
}
static void fade_borders16(FillBordersContext *s, AVFrame *frame)
{
const int depth = s->depth;
int p, y, x;
for (p = 0; p < s->nb_planes; p++) {
uint16_t *ptr = (uint16_t *)frame->data[p];
const uint16_t fill = s->fill[p] << (depth - 8);
const int linesize = frame->linesize[p] / 2;
const int start_left = s->borders[p].left;
const int start_right = s->planewidth[p] - s->borders[p].right;
const int start_top = s->borders[p].top;
const int start_bottom = s->planeheight[p] - s->borders[p].bottom;
for (y = 0; y < start_top; y++) {
for (x = 0; x < s->planewidth[p]; x++) {
int src = ptr[y * linesize + x];
ptr[y * linesize + x] = lerp16(fill, src, start_top - y, start_top, depth);
}
}
for (y = start_bottom; y < s->planeheight[p]; y++) {
for (x = 0; x < s->planewidth[p]; x++) {
int src = ptr[y * linesize + x];
ptr[y * linesize + x] = lerp16(fill, src, y - start_bottom, s->borders[p].bottom, depth);
}
}
for (y = 0; y < s->planeheight[p]; y++) {
for (x = 0; x < start_left; x++) {
int src = ptr[y * linesize + x];
ptr[y * linesize + x] = lerp16(fill, src, start_left - x, start_left, depth);
}
for (x = 0; x < s->borders[p].right; x++) {
int src = ptr[y * linesize + start_right + x];
ptr[y * linesize + start_right + x] = lerp16(fill, src, x, s->borders[p].right, depth);
}
}
}
}
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
{
FillBordersContext *s = inlink->dst->priv;
@ -460,6 +553,7 @@ static int config_input(AVFilterLink *inlink)
case FM_FIXED: s->fillborders = s->depth <= 8 ? fixed_borders8 : fixed_borders16; break;
case FM_REFLECT:s->fillborders = s->depth <= 8 ? reflect_borders8: reflect_borders16;break;
case FM_WRAP: s->fillborders = s->depth <= 8 ? wrap_borders8 : wrap_borders16; break;
case FM_FADE: s->fillborders = s->depth <= 8 ? fade_borders8 : fade_borders16; break;
default: av_assert0(0);
}
@ -508,7 +602,8 @@ static const AVOption fillborders_options[] = {
{ "fixed", NULL, 0, AV_OPT_TYPE_CONST, {.i64=FM_FIXED}, 0, 0, FLAGS, "mode" },
{ "reflect",NULL, 0, AV_OPT_TYPE_CONST, {.i64=FM_REFLECT},0, 0, FLAGS, "mode" },
{ "wrap", NULL, 0, AV_OPT_TYPE_CONST, {.i64=FM_WRAP}, 0, 0, FLAGS, "mode" },
{ "color", "set the color for the fixed mode", OFFSET(rgba_color), AV_OPT_TYPE_COLOR, {.str = "black"}, .flags = FLAGS },
{ "fade", NULL, 0, AV_OPT_TYPE_CONST, {.i64=FM_FADE}, 0, 0, FLAGS, "mode" },
{ "color", "set the color for the fixed/fade mode", OFFSET(rgba_color), AV_OPT_TYPE_COLOR, {.str = "black"}, .flags = FLAGS },
{ NULL }
};