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lavc/ccaption_dec: clear all unused rows during rollup

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Sometimes rollup captions can move around the screen. This fixes "ghost"
captions from below the current rollup area from continuing to be
captured when a rollup moves higher up on the screen.
This commit is contained in:
Aman Gupta 2016-01-12 17:27:06 -08:00 committed by Clément Bœsch
parent 9027806e3c
commit 3a0e5cfcee
1 changed files with 4 additions and 1 deletions
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5
libavcodec/ccaption_dec.c
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@ -294,8 +294,11 @@ static void roll_up(CCaptionSubContext *ctx)
*/
keep_lines = FFMIN(ctx->cursor_row + 1, ctx->rollup);
for (i = 0; i < ctx->cursor_row - keep_lines; i++)
for (i = 0; i < SCREEN_ROWS; i++) {
if (i > ctx->cursor_row - keep_lines && i <= ctx->cursor_row)
continue;
UNSET_FLAG(screen->row_used, i);
}
for (i = 0; i < keep_lines && screen->row_used; i++) {
const int i_row = ctx->cursor_row - keep_lines + i + 1;