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librsvgdec: Fix frame clearing code 

The existing code attempts to clear the frame by painting in OVER
mode with transparent black - which is a no-op. As a result if you
have many input frames (e.g. you're using a sequence of svg files),
you'll start to see new frames drawn over old frames as memory gets
re-used.

Switch the code to paint using the CLEAR compositing operator,
which fills every channel with 0 values (setting a source colour
is not required).
This commit is contained in:
Calvin Walton 2018-02-01 13:28:25 -05:00 committed by Rostislav Pehlivanov
parent 4be6307cbf
commit 108958e43d
1 changed files with 4 additions and 2 deletions
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6
libavcodec/librsvgdec.c
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@ -82,8 +82,10 @@ static int librsvg_decode_frame(AVCodecContext *avctx, void *data, int *got_fram
crender = cairo_create(image);
cairo_set_source_rgba(crender, 0.0, 0.0, 0.0, 1.0f);
cairo_paint_with_alpha(crender, 0.0f);
cairo_save(crender);
cairo_set_operator(crender, CAIRO_OPERATOR_CLEAR);
cairo_paint(crender);
cairo_restore(crender);
cairo_scale(crender, dimensions.width / (double)unscaled_dimensions.width,
dimensions.height / (double)unscaled_dimensions.height);