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cdgraphics: fix incorrect vertical offset mask in cdg_scroll() 

The vertical offset mask 0x07 is suspicious.

    v_off = FFMIN(data[2] & 0x07, CDG_BORDER_HEIGHT - 1);

Note that v_off is up to 11 (CDG_BORDER_HEIGHT - 1), the correct mask
should be 0x0F.

Signed-off-by: Xi Wang <xi.wang@gmail.com>
Signed-off-by: Anton Khirnov <anton@khirnov.net>
This commit is contained in:
Xi Wang 2012-11-14 03:42:37 -05:00 committed by Anton Khirnov
parent b655cfefaf
commit 0d3123666a
1 changed files with 1 additions and 1 deletions
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2
libavcodec/cdgraphics.c
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@ -218,7 +218,7 @@ static void cdg_scroll(CDGraphicsContext *cc, uint8_t *data,
vscmd = (data[2] & 0x30) >> 4;
h_off = FFMIN(data[1] & 0x07, CDG_BORDER_WIDTH - 1);
v_off = FFMIN(data[2] & 0x07, CDG_BORDER_HEIGHT - 1);
v_off = FFMIN(data[2] & 0x0F, CDG_BORDER_HEIGHT - 1);
/// find the difference and save the offset for cdg_tile_block usage
hinc = h_off - cc->hscroll;