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sub/spudec: fix artefacts at right border of subtitles 

Fix artefacts at right border of scaled bitmap subtitles by clearing
the destination to 0 first if the width is not a multiple of 8.
This is necessary because some of the optimized sub drawing functions
always draw pixels in multiples of 8, so we cannot rely on any "dirt"
in the "unused" borders being ignored.
Note that due to the way rendering works, both alpha and the image need
to be cleared.

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@33230 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
reimar 2011-04-07 21:08:49 +00:00 committed by Uoti Urpala
parent e617653265
commit dbde82d0f2
1 changed files with 4 additions and 0 deletions
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4
sub/spudec.c
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@ -920,6 +920,10 @@ void spudec_draw_scaled(void *me, unsigned int dxs, unsigned int dys, void (*dra
}
if (spu->scaled_image) {
unsigned int x, y;
// needs to be 0-initialized because draw_alpha draws always a
// multiple of 8 pixels. TODO: optimize
if (spu->scaled_width & 7)
memset(spu->scaled_image, 0, 2 * spu->scaled_image_size);
if (spu->scaled_width <= 1 || spu->scaled_height <= 1) {
goto nothing_to_do;
}