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Revert "rescaler: better handling of the fxy_scale=0 special case."

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This reverts commit 9f226bf8c3.

I dropped a 'dst_height' from 'ratio'!! My bad...

Change-Id: Id355f0f012a754cddf97012715d69aa5e03c2e5c
This commit is contained in:
Pascal Massimino 2015-10-07 19:43:56 +00:00 committed by James Zern
parent 9f226bf8c3
commit 55c05293d5
1 changed files with 3 additions and 9 deletions
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12
src/utils/rescaler.c
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@ -48,15 +48,9 @@ void WebPRescalerInit(WebPRescaler* const wrk, int src_width, int src_height,
wrk->y_sub = wrk->y_expand ? y_sub - 1 : y_sub;
wrk->y_accum = wrk->y_expand ? wrk->y_sub : wrk->y_add;
if (!wrk->y_expand) {
// this is WEBP_RESCALER_FRAC(1, x_add * y_add) without the cast.
const uint64_t ratio = WEBP_RESCALER_ONE / (wrk->x_add * wrk->y_add);
if (ratio != (uint32_t)ratio) {
// We can't represent the ratio with the current fixed-point precision.
// => We special-case fxy_scale = 0, in WebPRescalerExportRow().
wrk->fxy_scale = 0;
} else {
wrk->fxy_scale = (uint32_t)ratio;
}
// note the very special case where x_add = y_add = 1 cannot be represented.
// We special-case fxy_scale = 0 in this case, in WebPRescalerExportRow().
wrk->fxy_scale = WEBP_RESCALER_FRAC(dst_height, wrk->x_add * wrk->y_add);
wrk->fy_scale = WEBP_RESCALER_FRAC(1, wrk->y_sub);
} else {
wrk->fy_scale = WEBP_RESCALER_FRAC(1, wrk->x_add);