1 /*
2 * Copyright (c) 2017 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 "./vp9_rtcd.h"
12 #include "./vpx_dsp_rtcd.h"
13 #include "./vpx_scale_rtcd.h"
14 #include "vp9/common/vp9_blockd.h"
15 #include "vpx_dsp/vpx_filter.h"
16 #include "vpx_scale/yv12config.h"
17
vp9_scale_and_extend_frame_c(const YV12_BUFFER_CONFIG * src,YV12_BUFFER_CONFIG * dst,INTERP_FILTER filter_type,int phase_scaler)18 void vp9_scale_and_extend_frame_c(const YV12_BUFFER_CONFIG *src,
19 YV12_BUFFER_CONFIG *dst,
20 INTERP_FILTER filter_type, int phase_scaler) {
21 const int src_w = src->y_crop_width;
22 const int src_h = src->y_crop_height;
23 const uint8_t *const srcs[3] = { src->y_buffer, src->u_buffer,
24 src->v_buffer };
25 const int src_strides[3] = { src->y_stride, src->uv_stride, src->uv_stride };
26 uint8_t *const dsts[3] = { dst->y_buffer, dst->u_buffer, dst->v_buffer };
27 const int dst_strides[3] = { dst->y_stride, dst->uv_stride, dst->uv_stride };
28 const InterpKernel *const kernel = vp9_filter_kernels[filter_type];
29 int x, y, i;
30
31 #if HAVE_SSSE3 || HAVE_NEON
32 // TODO(linfengz): The 4:3 specialized C code is disabled by default since
33 // it's much slower than the general version which calls vpx_scaled_2d() even
34 // if vpx_scaled_2d() is not optimized. It will only be enabled as a reference
35 // for the platforms which have faster optimization.
36 if (4 * dst->y_crop_width == 3 * src_w &&
37 4 * dst->y_crop_height == 3 * src_h) {
38 // Specialize 4 to 3 scaling.
39 // Example pixel locations.
40 // (O: Original pixel. S: Scaled pixel. X: Overlapped pixel.)
41 // phase_scaler = 0 | phase_scaler = 8
42 // |
43 // X O S O S O X | O O O O O
44 // |
45 // |
46 // | S S S
47 // |
48 // |
49 // O O O O O | O O O O O
50 // |
51 // S S S S |
52 // |
53 // |
54 // | S S S
55 // O O O O O | O O O O O
56 // |
57 // |
58 // |
59 // S S S S |
60 // |
61 // O O O O O | O O O O O
62 // | S S S
63 // |
64 // |
65 // |
66 // |
67 // X O S O S O X | O O O O O
68
69 const int dst_ws[3] = { dst->y_crop_width, dst->uv_crop_width,
70 dst->uv_crop_width };
71 const int dst_hs[3] = { dst->y_crop_height, dst->uv_crop_height,
72 dst->uv_crop_height };
73 for (i = 0; i < MAX_MB_PLANE; ++i) {
74 const int dst_w = dst_ws[i];
75 const int dst_h = dst_hs[i];
76 const int src_stride = src_strides[i];
77 const int dst_stride = dst_strides[i];
78 for (y = 0; y < dst_h; y += 3) {
79 for (x = 0; x < dst_w; x += 3) {
80 const uint8_t *src_ptr = srcs[i] + 4 * y / 3 * src_stride + 4 * x / 3;
81 uint8_t *dst_ptr = dsts[i] + y * dst_stride + x;
82
83 // Must call c function because its optimization doesn't support 3x3.
84 vpx_scaled_2d_c(src_ptr, src_stride, dst_ptr, dst_stride, kernel,
85 phase_scaler, 64 / 3, phase_scaler, 64 / 3, 3, 3);
86 }
87 }
88 }
89 } else
90 #endif
91 {
92 const int dst_w = dst->y_crop_width;
93 const int dst_h = dst->y_crop_height;
94 for (i = 0; i < MAX_MB_PLANE; ++i) {
95 const int factor = (i == 0 || i == 3 ? 1 : 2);
96 const int src_stride = src_strides[i];
97 const int dst_stride = dst_strides[i];
98 for (y = 0; y < dst_h; y += 16) {
99 const int y_q4 = y * (16 / factor) * src_h / dst_h + phase_scaler;
100 for (x = 0; x < dst_w; x += 16) {
101 const int x_q4 = x * (16 / factor) * src_w / dst_w + phase_scaler;
102 const uint8_t *src_ptr = srcs[i] +
103 (y / factor) * src_h / dst_h * src_stride +
104 (x / factor) * src_w / dst_w;
105 uint8_t *dst_ptr = dsts[i] + (y / factor) * dst_stride + (x / factor);
106
107 vpx_scaled_2d(src_ptr, src_stride, dst_ptr, dst_stride, kernel,
108 x_q4 & 0xf, 16 * src_w / dst_w, y_q4 & 0xf,
109 16 * src_h / dst_h, 16 / factor, 16 / factor);
110 }
111 }
112 }
113 }
114
115 vpx_extend_frame_borders(dst);
116 }
117