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 12 #include "extend.h" 13 #include "vpx_mem/vpx_mem.h" 14 15 16 static void extend_plane_borders 17 ( 18 unsigned char *s, /* source */ 19 int sp, /* pitch */ 20 int h, /* height */ 21 int w, /* width */ 22 int et, /* extend top border */ 23 int el, /* extend left border */ 24 int eb, /* extend bottom border */ 25 int er /* extend right border */ 26 ) 27 { 28 29 int i; 30 unsigned char *src_ptr1, *src_ptr2; 31 unsigned char *dest_ptr1, *dest_ptr2; 32 int linesize; 33 34 /* copy the left and right most columns out */ 35 src_ptr1 = s; 36 src_ptr2 = s + w - 1; 37 dest_ptr1 = s - el; 38 dest_ptr2 = s + w; 39 40 for (i = 0; i < h - 0 + 1; i++) 41 { 42 /* Some linkers will complain if we call vpx_memset with el set to a 43 * constant 0. 44 */ 45 if (el) 46 vpx_memset(dest_ptr1, src_ptr1[0], el); 47 vpx_memset(dest_ptr2, src_ptr2[0], er); 48 src_ptr1 += sp; 49 src_ptr2 += sp; 50 dest_ptr1 += sp; 51 dest_ptr2 += sp; 52 } 53 54 /* Now copy the top and bottom source lines into each line of the respective borders */ 55 src_ptr1 = s - el; 56 src_ptr2 = s + sp * (h - 1) - el; 57 dest_ptr1 = s + sp * (-et) - el; 58 dest_ptr2 = s + sp * (h) - el; 59 linesize = el + er + w + 1; 60 61 for (i = 0; i < (int)et; i++) 62 { 63 vpx_memcpy(dest_ptr1, src_ptr1, linesize); 64 dest_ptr1 += sp; 65 } 66 67 for (i = 0; i < (int)eb; i++) 68 { 69 vpx_memcpy(dest_ptr2, src_ptr2, linesize); 70 dest_ptr2 += sp; 71 } 72 } 73 74 75 void vp8_extend_to_multiple_of16(YV12_BUFFER_CONFIG *ybf, int width, int height) 76 { 77 int er = 0xf & (16 - (width & 0xf)); 78 int eb = 0xf & (16 - (height & 0xf)); 79 80 /* check for non multiples of 16 */ 81 if (er != 0 || eb != 0) 82 { 83 extend_plane_borders(ybf->y_buffer, ybf->y_stride, height, width, 0, 0, eb, er); 84 85 /* adjust for uv */ 86 height = (height + 1) >> 1; 87 width = (width + 1) >> 1; 88 er = 0x7 & (8 - (width & 0x7)); 89 eb = 0x7 & (8 - (height & 0x7)); 90 91 if (er || eb) 92 { 93 extend_plane_borders(ybf->u_buffer, ybf->uv_stride, height, width, 0, 0, eb, er); 94 extend_plane_borders(ybf->v_buffer, ybf->uv_stride, height, width, 0, 0, eb, er); 95 } 96 } 97 } 98 99 /* note the extension is only for the last row, for intra prediction purpose */ 100 void vp8_extend_mb_row(YV12_BUFFER_CONFIG *ybf, unsigned char *YPtr, unsigned char *UPtr, unsigned char *VPtr) 101 { 102 int i; 103 104 YPtr += ybf->y_stride * 14; 105 UPtr += ybf->uv_stride * 6; 106 VPtr += ybf->uv_stride * 6; 107 108 for (i = 0; i < 4; i++) 109 { 110 YPtr[i] = YPtr[-1]; 111 UPtr[i] = UPtr[-1]; 112 VPtr[i] = VPtr[-1]; 113 } 114 115 YPtr += ybf->y_stride; 116 UPtr += ybf->uv_stride; 117 VPtr += ybf->uv_stride; 118 119 for (i = 0; i < 4; i++) 120 { 121 YPtr[i] = YPtr[-1]; 122 UPtr[i] = UPtr[-1]; 123 VPtr[i] = VPtr[-1]; 124 } 125 } 126
