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Add an extra check to avoid a case that cause black lines in scaled

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vobsubs due to an overflow in the multiplication.


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@25668 b3059339-0415-0410-9bf9-f77b7e298cf2
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reimar 2008-01-10 21:47:33 +00:00
parent 8661c5f8c0
commit 89518d1df3
1 changed files with 2 additions and 0 deletions
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spudec.c
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@ -731,6 +731,8 @@ static void scale_image(int x, int y, scale_pixel* table_x, scale_pixel* table_y
color[2] = spu->image[base + spu->stride];
color[3] = spu->image[base + spu->stride + 1];
scale[0] = (table_x[x].left_up * table_y[y].left_up >> 16) * alpha[0];
if (table_y[y].left_up == 0x10000) // necessary to avoid overflow-case
scale[0] = table_x[x].left_up * alpha[0];
scale[1] = (table_x[x].right_down * table_y[y].left_up >>16) * alpha[1];
scale[2] = (table_x[x].left_up * table_y[y].right_down >> 16) * alpha[2];
scale[3] = (table_x[x].right_down * table_y[y].right_down >> 16) * alpha[3];