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get_disto: fix the r/g/b order for luma calculation

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Change-Id: I62be556f6254031e8c1f1a572cfdc4ea2641483b
This commit is contained in:
Pascal Massimino 2016-09-30 16:04:17 +02:00
parent 9310d19258
commit fb01743a53
1 changed files with 2 additions and 2 deletions
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4
extras/get_disto.c
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@ -186,9 +186,9 @@ static void ConvertToGray(WebPPicture* const pic) {
uint32_t* const row = &pic->argb[y * pic->argb_stride]; uint32_t* const row = &pic->argb[y * pic->argb_stride];
for (x = 0; x < pic->width; ++x) { for (x = 0; x < pic->width; ++x) {
const uint32_t argb = row[x]; const uint32_t argb = row[x];
const uint32_t r = (argb >> 0) & 0xff; const uint32_t r = (argb >> 16) & 0xff;
const uint32_t g = (argb >> 8) & 0xff; const uint32_t g = (argb >> 8) & 0xff;
const uint32_t b = (argb >> 16) & 0xff; const uint32_t b = (argb >> 0) & 0xff;
// We use BT.709 for converting to luminance. // We use BT.709 for converting to luminance.
const uint32_t Y = (uint32_t)(0.2126 * r + 0.7152 * g + 0.0722 * b + .5); const uint32_t Y = (uint32_t)(0.2126 * r + 0.7152 * g + 0.0722 * b + .5);
row[x] = (argb & 0xff000000u) | (Y * 0x010101u); row[x] = (argb & 0xff000000u) | (Y * 0x010101u);