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Merge "ReconstructRow: move some one-time inits out of the main loop"

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This commit is contained in:
James Zern 2015-04-16 14:51:36 -07:00 committed by Gerrit Code Review
commit d6fe588469
1 changed files with 24 additions and 21 deletions
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45
src/dec/frame.c
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@ -39,7 +39,7 @@ static int CheckMode(int mb_x, int mb_y, int mode) {
return mode;
}
static void Copy32b(uint8_t* dst, uint8_t* src) {
static void Copy32b(uint8_t* const dst, const uint8_t* const src) {
memcpy(dst, src, 4);
}
@ -80,6 +80,28 @@ static void ReconstructRow(const VP8Decoder* const dec,
uint8_t* const y_dst = dec->yuv_b_ + Y_OFF;
uint8_t* const u_dst = dec->yuv_b_ + U_OFF;
uint8_t* const v_dst = dec->yuv_b_ + V_OFF;
// Initialize left-most block.
for (j = 0; j < 16; ++j) {
y_dst[j * BPS - 1] = 129;
}
for (j = 0; j < 8; ++j) {
u_dst[j * BPS - 1] = 129;
v_dst[j * BPS - 1] = 129;
}
// Init top-left sample on left column too.
if (mb_y > 0) {
y_dst[-1 - BPS] = u_dst[-1 - BPS] = v_dst[-1 - BPS] = 129;
} else {
// we only need to do this init once at block (0,0).
// Afterward, it remains valid for the whole topmost row.
memset(y_dst - BPS - 1, 127, 16 + 4 + 1);
memset(u_dst - BPS - 1, 127, 8 + 1);
memset(v_dst - BPS - 1, 127, 8 + 1);
}
// Reconstruct one row.
for (mb_x = 0; mb_x < dec->mb_w_; ++mb_x) {
const VP8MBData* const block = ctx->mb_data_ + mb_x;
@ -93,18 +115,6 @@ static void ReconstructRow(const VP8Decoder* const dec,
Copy32b(&u_dst[j * BPS - 4], &u_dst[j * BPS + 4]);
Copy32b(&v_dst[j * BPS - 4], &v_dst[j * BPS + 4]);
}
} else {
for (j = 0; j < 16; ++j) {
y_dst[j * BPS - 1] = 129;
}
for (j = 0; j < 8; ++j) {
u_dst[j * BPS - 1] = 129;
v_dst[j * BPS - 1] = 129;
}
// Init top-left sample on left column too
if (mb_y > 0) {
y_dst[-1 - BPS] = u_dst[-1 - BPS] = v_dst[-1 - BPS] = 129;
}
}
{
// bring top samples into the cache
@ -117,12 +127,6 @@ static void ReconstructRow(const VP8Decoder* const dec,
memcpy(y_dst - BPS, top_yuv[0].y, 16);
memcpy(u_dst - BPS, top_yuv[0].u, 8);
memcpy(v_dst - BPS, top_yuv[0].v, 8);
} else if (mb_x == 0) {
// we only need to do this init once at block (0,0).
// Afterward, it remains valid for the whole topmost row.
memset(y_dst - BPS - 1, 127, 16 + 4 + 1);
memset(u_dst - BPS - 1, 127, 8 + 1);
memset(v_dst - BPS - 1, 127, 8 + 1);
}
// predict and add residuals
@ -146,8 +150,7 @@ static void ReconstructRow(const VP8Decoder* const dec,
DoTransform(bits, coeffs + n * 16, dst);
}
} else { // 16x16
const int pred_func = CheckMode(mb_x, mb_y,
block->imodes_[0]);
const int pred_func = CheckMode(mb_x, mb_y, block->imodes_[0]);
VP8PredLuma16[pred_func](y_dst);
if (bits != 0) {
for (n = 0; n < 16; ++n, bits <<= 2) {