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avfilter/vsrc_gradients: make rotation always continuous if speed changes

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This commit is contained in:
Paul B Mahol 2023-12-03 18:41:31 +01:00
parent 8888574d10
commit e3e3531d1e
1 changed files with 4 additions and 1 deletions
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5
libavfilter/vsrc_gradients.c
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@ -37,6 +37,7 @@ typedef struct GradientsContext {
int64_t pts;
int64_t duration; ///< duration expressed in microseconds
float speed;
float angle;
uint8_t color_rgba[8][4];
float color_rgbaf[8][4];
@ -392,10 +393,12 @@ static int activate(AVFilterContext *ctx)
if (ff_outlink_frame_wanted(outlink)) {
AVFrame *frame = ff_get_video_buffer(outlink, s->w, s->h);
float angle = (s->speed > 0.f) ? fmodf(s->pts * s->speed, 2.f * M_PI) : 1.f;
float angle = fmodf(s->angle, 2.f * M_PI);
const float w2 = s->w / 2.f;
const float h2 = s->h / 2.f;
s->angle = angle + s->speed;
s->fx0 = (s->x0 - w2) * cosf(angle) - (s->y0 - h2) * sinf(angle) + w2;
s->fy0 = (s->x0 - w2) * sinf(angle) + (s->y0 - h2) * cosf(angle) + h2;