1 files changed, 75 insertions, 0 deletions
diff --git a/media/libvpx/libvpx/vp8/common/reconintra4x4.c b/media/libvpx/libvpx/vp8/common/reconintra4x4.c
new file mode 100644
index 0000000000..be936df5e0
--- /dev/null
+++ b/media/libvpx/libvpx/vp8/common/reconintra4x4.c
@@ -0,0 +1,75 @@
+/*
+ *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include <string.h>
+
+#include "vpx_config.h"
+#include "./vpx_dsp_rtcd.h"
+#include "vp8_rtcd.h"
+#include "blockd.h"
+#include "reconintra4x4.h"
+#include "vp8/common/common.h"
+#include "vpx_ports/compiler_attributes.h"
+
+typedef void (*intra_pred_fn)(uint8_t *dst, ptrdiff_t stride,
+                              const uint8_t *above, const uint8_t *left);
+
+static intra_pred_fn pred[10];
+
+void vp8_init_intra4x4_predictors_internal(void) {
+  pred[B_DC_PRED] = vpx_dc_predictor_4x4;
+  pred[B_TM_PRED] = vpx_tm_predictor_4x4;
+  pred[B_VE_PRED] = vpx_ve_predictor_4x4;
+  pred[B_HE_PRED] = vpx_he_predictor_4x4;
+  pred[B_LD_PRED] = vpx_d45e_predictor_4x4;
+  pred[B_RD_PRED] = vpx_d135_predictor_4x4;
+  pred[B_VR_PRED] = vpx_d117_predictor_4x4;
+  pred[B_VL_PRED] = vpx_d63e_predictor_4x4;
+  pred[B_HD_PRED] = vpx_d153_predictor_4x4;
+  pred[B_HU_PRED] = vpx_d207_predictor_4x4;
+}
+
+void vp8_intra4x4_predict(unsigned char *above, unsigned char *yleft,
+                          int left_stride, B_PREDICTION_MODE b_mode,
+                          unsigned char *dst, int dst_stride,
+                          unsigned char top_left) {
+/* Power PC implementation uses "vec_vsx_ld" to read 16 bytes from
+   Above (aka, Aboveb + 4). Play it safe by reserving enough stack
+   space here. Similary for "Left". */
+#if HAVE_VSX
+  unsigned char Aboveb[20];
+#else
+  unsigned char Aboveb[12];
+#endif
+  unsigned char *Above = Aboveb + 4;
+#if HAVE_NEON
+  // Neon intrinsics are unable to load 32 bits, or 4 8 bit values. Instead, it
+  // over reads but does not use the extra 4 values.
+  unsigned char Left[8];
+#if VPX_WITH_ASAN
+  // Silence an 'uninitialized read' warning. Although uninitialized values are
+  // indeed read, they are not used.
+  vp8_zero_array(Left, 8);
+#endif  // VPX_WITH_ASAN
+#elif HAVE_VSX
+  unsigned char Left[16];
+#else
+  unsigned char Left[4];
+#endif  // HAVE_NEON
+
+  Left[0] = yleft[0];
+  Left[1] = yleft[left_stride];
+  Left[2] = yleft[2 * left_stride];
+  Left[3] = yleft[3 * left_stride];
+  memcpy(Above, above, 8);
+  Above[-1] = top_left;
+
+  pred[b_mode](dst, dst_stride, Above, Left);
+}