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videomixer: Don't do floating point math in the inner processing loop for I420 blending

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This commit is contained in:
Sebastian Dröge 2009-12-11 12:35:59 +01:00
parent b8c2ccce4e
commit 089d9d9dba
1 changed files with 4 additions and 1 deletions
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5
gst/videomixer/blend_i420.c
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@ -190,6 +190,7 @@ gst_i420_do_blend (guint8 * src, guint8 * dest,
gint dest_width, gdouble src_alpha) gint dest_width, gdouble src_alpha)
{ {
int i, j; int i, j;
gint b_alpha;
/* If it's completely transparent... we just return */ /* If it's completely transparent... we just return */
if (G_UNLIKELY (src_alpha == 0.0)) { if (G_UNLIKELY (src_alpha == 0.0)) {
@ -208,9 +209,11 @@ gst_i420_do_blend (guint8 * src, guint8 * dest,
return; return;
} }
b_alpha = (gint) (src_alpha * 255);
for (i = 0; i < src_height; i++) { for (i = 0; i < src_height; i++) {
for (j = 0; j < src_width; j++) { for (j = 0; j < src_width; j++) {
*dest = src_alpha * (*src) + (1. - src_alpha) * (*dest); *dest = (b_alpha * (*src) + (255 - b_alpha) * (*dest)) >> 16;
dest++; dest++;
src++; src++;
} }