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revamp the point-sampling functions by processing a full plane

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-nofancy is slower than fancy upsampler, because the latter has SSE2 optim.

Change-Id: Ibf22e5a8ea1de86a54248d4a4ecc63d514c01b88
This commit is contained in:
Pascal Massimino
2014-05-20 09:43:02 -07:00
parent 2b5cb32612
commit a2f8b28905
4 changed files with 115 additions and 121 deletions
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28
src/dec/io.c
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@ -45,27 +45,12 @@ static int EmitYUV(const VP8Io* const io, WebPDecParams* const p) {
// Point-sampling U/V sampler.
static int EmitSampledRGB(const VP8Io* const io, WebPDecParams* const p) {
WebPDecBuffer* output = p->output;
const WebPRGBABuffer* const buf = &output->u.RGBA;
uint8_t* dst = buf->rgba + io->mb_y * buf->stride;
const uint8_t* y_src = io->y;
const uint8_t* u_src = io->u;
const uint8_t* v_src = io->v;
const WebPSampleLinePairFunc sample = WebPSamplers[output->colorspace];
const int mb_w = io->mb_w;
const int last = io->mb_h - 1;
int j;
for (j = 0; j < last; j += 2) {
sample(y_src, y_src + io->y_stride, u_src, v_src,
dst, dst + buf->stride, mb_w);
y_src += 2 * io->y_stride;
u_src += io->uv_stride;
v_src += io->uv_stride;
dst += 2 * buf->stride;
}
if (j == last) { // Just do the last line twice
sample(y_src, y_src, u_src, v_src, dst, dst, mb_w);
}
WebPDecBuffer* const output = p->output;
WebPRGBABuffer* const buf = &output->u.RGBA;
uint8_t* const dst = buf->rgba + io->mb_y * buf->stride;
WebPSamplers[output->colorspace](io->y, io->y_stride,
io->u, io->v, io->uv_stride,
dst, buf->stride, io->mb_w, io->mb_h);
return io->mb_h;
}
@ -637,4 +622,3 @@ void WebPInitCustomIo(WebPDecParams* const params, VP8Io* const io) {
}
//------------------------------------------------------------------------------