libvpx: Pull from upstream

source/libvpx/vp9/encoder/vp9_rd.c

Index: source/libvpx/vp9/encoder/vp9_rd.c
===================================================================
--- source/libvpx/vp9/encoder/vp9_rd.c	(revision 293588)
+++ source/libvpx/vp9/encoder/vp9_rd.c	(working copy)
@@ -379,7 +379,7 @@
   *d_q10 = (dist_tab_q10[xq] * b_q10 + dist_tab_q10[xq + 1] * a_q10) >> 10;
 }
 
-void vp9_model_rd_from_var_lapndz(unsigned int var, unsigned int n,
+void vp9_model_rd_from_var_lapndz(unsigned int var, unsigned int n_log2,
                                   unsigned int qstep, int *rate,
                                   int64_t *dist) {
   // This function models the rate and distortion for a Laplacian
@@ -395,10 +395,10 @@
     int d_q10, r_q10;
     static const uint32_t MAX_XSQ_Q10 = 245727;
     const uint64_t xsq_q10_64 =
-        ((((uint64_t)qstep * qstep * n) << 10) + (var >> 1)) / var;
+        (((uint64_t)qstep * qstep << (n_log2 + 10)) + (var >> 1)) / var;
     const int xsq_q10 = (int)MIN(xsq_q10_64, MAX_XSQ_Q10);
     model_rd_norm(xsq_q10, &r_q10, &d_q10);
-    *rate = (n * r_q10 + 2) >> 2;
+    *rate = ((r_q10 << n_log2) + 2) >> 2;
     *dist = (var * (int64_t)d_q10 + 512) >> 10;
   }
 }
@@ -516,6 +516,20 @@
   }
 }
 
+int vp9_raster_block_offset(BLOCK_SIZE plane_bsize,
+                            int raster_block, int stride) {
+  const int bw = b_width_log2_lookup[plane_bsize];
+  const int y = 4 * (raster_block >> bw);
+  const int x = 4 * (raster_block & ((1 << bw) - 1));
+  return y * stride + x;
+}
+
+int16_t* vp9_raster_block_offset_int16(BLOCK_SIZE plane_bsize,
+                                       int raster_block, int16_t *base) {
+  const int stride = 4 * num_4x4_blocks_wide_lookup[plane_bsize];
+  return base + vp9_raster_block_offset(plane_bsize, raster_block, stride);
+}
+
 const YV12_BUFFER_CONFIG *vp9_get_scaled_ref_frame(const VP9_COMP *cpi,
                                                    int ref_frame) {
   const VP9_COMMON *const cm = &cpi->common;