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fix loop bug in DispatchAlpha()

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* We were re-doing most of the work in plain-C as 'left-over'.
* we were always returning has_alpha = true because of a bad mask all_0xff

These bugs were conservative and silent, in the sense that we were 'just' doing
more work than necessary.

Now, the SSE2 version is really 2x faster than the C version.

Change-Id: I6c8132a267fe3c7a3d1fa70e7a5fcd10719543fa
This commit is contained in:
Pascal Massimino
2014-09-11 22:35:08 +02:00
parent 3101f53720
commit 690b491af1
2 changed files with 5 additions and 7 deletions
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2
src/dec/io.c
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@ -210,7 +210,7 @@ static int EmitAlphaRGB(const VP8Io* const io, WebPDecParams* const p) {
const int has_alpha = WebPDispatchAlpha(alpha, io->width, mb_w,
num_rows, dst, buf->stride);
// alpha_mask is < 0xff if there's non-trivial alpha to premultiply with.
// has_alpha is true if there's non-trivial alpha to premultiply with.
if (has_alpha && WebPIsPremultipliedMode(colorspace)) {
WebPApplyAlphaMultiply(base_rgba, alpha_first,
mb_w, num_rows, buf->stride);