libvpx: Pull from upstream

source/libvpx/vp9/encoder/vp9_encodemb.c

Index: source/libvpx/vp9/encoder/vp9_encodemb.c
===================================================================
--- source/libvpx/vp9/encoder/vp9_encodemb.c	(revision 278778)
+++ source/libvpx/vp9/encoder/vp9_encodemb.c	(working copy)
@@ -301,6 +301,52 @@
     vp9_fdct32x32(src, dst, src_stride);
 }
 
+void vp9_xform_quant_fp(MACROBLOCK *x, int plane, int block,
+                        BLOCK_SIZE plane_bsize, TX_SIZE tx_size) {
+  MACROBLOCKD *const xd = &x->e_mbd;
+  const struct macroblock_plane *const p = &x->plane[plane];
+  const struct macroblockd_plane *const pd = &xd->plane[plane];
+  int16_t *const coeff = BLOCK_OFFSET(p->coeff, block);
+  int16_t *const qcoeff = BLOCK_OFFSET(p->qcoeff, block);
+  int16_t *const dqcoeff = BLOCK_OFFSET(pd->dqcoeff, block);
+  uint16_t *const eob = &p->eobs[block];
+  const int diff_stride = 4 * num_4x4_blocks_wide_lookup[plane_bsize];
+  int i, j;
+  const int16_t *src_diff;
+
+  txfrm_block_to_raster_xy(plane_bsize, tx_size, block, &i, &j);
+  src_diff = &p->src_diff[4 * (j * diff_stride + i)];
+
+  switch (tx_size) {
+    case TX_32X32:
+      vp9_fdct32x32_1(src_diff, coeff, diff_stride);
+      vp9_quantize_dc_32x32(coeff, x->skip_block, p->round,
+                            p->quant_fp[0], qcoeff, dqcoeff,
+                            pd->dequant[0], eob);
+      break;
+    case TX_16X16:
+      vp9_fdct16x16_1(src_diff, coeff, diff_stride);
+      vp9_quantize_dc(coeff, x->skip_block, p->round,
+                     p->quant_fp[0], qcoeff, dqcoeff,
+                     pd->dequant[0], eob);
+      break;
+    case TX_8X8:
+      vp9_fdct8x8_1(src_diff, coeff, diff_stride);
+      vp9_quantize_dc(coeff, x->skip_block, p->round,
+                      p->quant_fp[0], qcoeff, dqcoeff,
+                      pd->dequant[0], eob);
+      break;
+    case TX_4X4:
+      x->fwd_txm4x4(src_diff, coeff, diff_stride);
+      vp9_quantize_dc(coeff, x->skip_block, p->round,
+                      p->quant_fp[0], qcoeff, dqcoeff,
+                      pd->dequant[0], eob);
+      break;
+    default:
+      assert(0);
+  }
+}
+
 void vp9_xform_quant(MACROBLOCK *x, int plane, int block,
                      BLOCK_SIZE plane_bsize, TX_SIZE tx_size) {
   MACROBLOCKD *const xd = &x->e_mbd;
@@ -376,8 +422,19 @@
     return;
   }
 
-  if (!x->skip_recode)
-    vp9_xform_quant(x, plane, block, plane_bsize, tx_size);
+  if (x->skip_txfm == 0) {
+    // full forward transform and quantization
+    if (!x->skip_recode)
+      vp9_xform_quant(x, plane, block, plane_bsize, tx_size);
+  } else if (x->skip_txfm == 2) {
+    // fast path forward transform and quantization
+    vp9_xform_quant_fp(x, plane, block, plane_bsize, tx_size);
+  } else {
+    // skip forward transform
+    p->eobs[block] = 0;
+    *a = *l = 0;
+    return;
+  }
 
   if (x->optimize && (!x->skip_recode || !x->skip_optimize)) {
     const int ctx = combine_entropy_contexts(*a, *l);
@@ -406,7 +463,7 @@
       // this is like vp9_short_idct4x4 but has a special case around eob<=1
       // which is significant (not just an optimization) for the lossless
       // case.
-      xd->itxm_add(dqcoeff, dst, pd->dst.stride, p->eobs[block]);
+      x->itxm_add(dqcoeff, dst, pd->dst.stride, p->eobs[block]);
       break;
     default:
       assert(0 && "Invalid transform size");
@@ -428,7 +485,7 @@
   vp9_xform_quant(x, plane, block, plane_bsize, tx_size);
 
   if (p->eobs[block] > 0)
-    xd->itxm_add(dqcoeff, dst, pd->dst.stride, p->eobs[block]);
+    x->itxm_add(dqcoeff, dst, pd->dst.stride, p->eobs[block]);
 }
 
 void vp9_encode_sby_pass1(MACROBLOCK *x, BLOCK_SIZE bsize) {
@@ -574,7 +631,7 @@
           // this is like vp9_short_idct4x4 but has a special case around eob<=1
           // which is significant (not just an optimization) for the lossless
           // case.
-          xd->itxm_add(dqcoeff, dst, dst_stride, *eob);
+          x->itxm_add(dqcoeff, dst, dst_stride, *eob);
         else
           vp9_iht4x4_16_add(dqcoeff, dst, dst_stride, tx_type);
       }