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fix rescaling-with-alpha inaccuracy

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(still missing YUVA decoding case for now)

https://code.google.com/p/webp/issues/detail?id=160

Change-Id: If723b4a5c0a303d0853ec9d839f995adce056095
This commit is contained in:
Pascal Massimino
2013-07-26 12:05:42 -07:00
committed by skal
parent 11249abfc7
commit 8dcae8b3cf
10 changed files with 342 additions and 37 deletions
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5
src/utils/rescaler.c
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@ -123,6 +123,11 @@ uint8_t* WebPRescalerExportRow(WebPRescaler* const wrk) {
//------------------------------------------------------------------------------
// all-in-one calls
int WebPRescaleNeededLines(const WebPRescaler* const wrk, int max_num_lines) {
const int num_lines = (wrk->y_accum + wrk->y_sub - 1) / wrk->y_sub;
return (num_lines > max_num_lines) ? max_num_lines : num_lines;
}
int WebPRescalerImport(WebPRescaler* const wrk, int num_lines,
const uint8_t* src, int src_stride) {
int total_imported = 0;