1 /*
2 * Copyright (c) 2010 The WebM project authors. All Rights Reserved.
3 *
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
10
11 #include <string.h>
12
13 #include "vpx_config.h"
14 #include "./vpx_dsp_rtcd.h"
15 #include "vp8_rtcd.h"
16 #include "blockd.h"
17 #include "reconintra4x4.h"
18 #include "vp8/common/common.h"
19 #include "vpx_ports/compiler_attributes.h"
20
21 typedef void (*intra_pred_fn)(uint8_t *dst, ptrdiff_t stride,
22 const uint8_t *above, const uint8_t *left);
23
24 static intra_pred_fn pred[10];
25
vp8_init_intra4x4_predictors_internal(void)26 void vp8_init_intra4x4_predictors_internal(void) {
27 pred[B_DC_PRED] = vpx_dc_predictor_4x4;
28 pred[B_TM_PRED] = vpx_tm_predictor_4x4;
29 pred[B_VE_PRED] = vpx_ve_predictor_4x4;
30 pred[B_HE_PRED] = vpx_he_predictor_4x4;
31 pred[B_LD_PRED] = vpx_d45e_predictor_4x4;
32 pred[B_RD_PRED] = vpx_d135_predictor_4x4;
33 pred[B_VR_PRED] = vpx_d117_predictor_4x4;
34 pred[B_VL_PRED] = vpx_d63e_predictor_4x4;
35 pred[B_HD_PRED] = vpx_d153_predictor_4x4;
36 pred[B_HU_PRED] = vpx_d207_predictor_4x4;
37 }
38
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)39 void vp8_intra4x4_predict(unsigned char *above, unsigned char *yleft,
40 int left_stride, B_PREDICTION_MODE b_mode,
41 unsigned char *dst, int dst_stride,
42 unsigned char top_left) {
43 /* Power PC implementation uses "vec_vsx_ld" to read 16 bytes from
44 Above (aka, Aboveb + 4). Play it safe by reserving enough stack
45 space here. Similary for "Left". */
46 #if HAVE_VSX
47 unsigned char Aboveb[20];
48 #else
49 unsigned char Aboveb[12];
50 #endif
51 unsigned char *Above = Aboveb + 4;
52 #if HAVE_NEON
53 // Neon intrinsics are unable to load 32 bits, or 4 8 bit values. Instead, it
54 // over reads but does not use the extra 4 values.
55 unsigned char Left[8];
56 #if VPX_WITH_ASAN
57 // Silence an 'uninitialized read' warning. Although uninitialized values are
58 // indeed read, they are not used.
59 vp8_zero_array(Left, 8);
60 #endif // VPX_WITH_ASAN
61 #elif HAVE_VSX
62 unsigned char Left[16];
63 #else
64 unsigned char Left[4];
65 #endif // HAVE_NEON
66
67 Left[0] = yleft[0];
68 Left[1] = yleft[left_stride];
69 Left[2] = yleft[2 * left_stride];
70 Left[3] = yleft[3 * left_stride];
71 memcpy(Above, above, 8);
72 Above[-1] = top_left;
73
74 pred[b_mode](dst, dst_stride, Above, Left);
75 }
76