ref: daefbf2a6f5a2a9334355845396fa5f2fdccbaa5
dir: /vp8/common/reconintra4x4.c/
/* * 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/mem.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); }