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MIPS: dspr2: added optimization for EmitAlphaRGB

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New dsp function: WebPDispatchAlpha()

Change-Id: I48e539d22471279ec75185759bc68d18b127f716
This commit is contained in:
Djordje Pesut
2014-08-21 19:26:18 +02:00
committed by skal
parent 953acd56a4
commit 0b21c30b1a
8 changed files with 131 additions and 13 deletions
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17
src/dec/io.c
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@ -206,21 +206,12 @@ static int EmitAlphaRGB(const VP8Io* const io, WebPDecParams* const p) {
int num_rows;
const int start_y = GetAlphaSourceRow(io, &alpha, &num_rows);
uint8_t* const base_rgba = buf->rgba + start_y * buf->stride;
uint8_t* dst = base_rgba + (alpha_first ? 0 : 3);
uint32_t alpha_mask = 0xff;
int i, j;
uint8_t* const dst = base_rgba + (alpha_first ? 0 : 3);
const int has_alpha = WebPDispatchAlpha(alpha, io->width, mb_w,
num_rows, dst, buf->stride);
for (j = 0; j < num_rows; ++j) {
for (i = 0; i < mb_w; ++i) {
const uint32_t alpha_value = alpha[i];
dst[4 * i] = alpha_value;
alpha_mask &= alpha_value;
}
alpha += io->width;
dst += buf->stride;
}
// alpha_mask is < 0xff if there's non-trivial alpha to premultiply with.
if (alpha_mask != 0xff && WebPIsPremultipliedMode(colorspace)) {
if (has_alpha && WebPIsPremultipliedMode(colorspace)) {
WebPApplyAlphaMultiply(base_rgba, alpha_first,
mb_w, num_rows, buf->stride);
}