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Line	Branch	Exec	Source
1			/*
2			* Copyright (C) 2010 Georg Martius <georg.martius@web.de>
3			* Copyright (C) 2010 Daniel G. Taylor <dan@programmer-art.org>
4			*
5			* This file is part of FFmpeg.
6			*
7			* FFmpeg is free software; you can redistribute it and/or
8			* modify it under the terms of the GNU Lesser General Public
9			* License as published by the Free Software Foundation; either
10			* version 2.1 of the License, or (at your option) any later version.
11			*
12			* FFmpeg is distributed in the hope that it will be useful,
13			* but WITHOUT ANY WARRANTY; without even the implied warranty of
14			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15			* Lesser General Public License for more details.
16			*
17			* You should have received a copy of the GNU Lesser General Public
18			* License along with FFmpeg; if not, write to the Free Software
19			* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20			*/
21
22			/**
23			* @file
24			* transform input video
25			*/
26
27			#include "libavutil/common.h"
28			#include "libavutil/avassert.h"
29
30			#include "transform.h"
31
32			#define INTERPOLATE_METHOD(name) \
33			static uint8_t name(float x, float y, const uint8_t *src, \
34			int width, int height, int stride, uint8_t def)
35
36			#define PIXEL(img, x, y, w, h, stride, def) \
37			((x) < 0 || (y) < 0) ? (def) : \
38			(((x) >= (w) || (y) >= (h)) ? (def) : \
39			img[(x) + (y) * (stride)])
40
41			/**
42			* Nearest neighbor interpolation
43			*/
44		✗	INTERPOLATE_METHOD(interpolate_nearest)
45			{
46		✗	return PIXEL(src, (int)(x + 0.5), (int)(y + 0.5), width, height, stride, def);
47			}
48
49			/**
50			* Bilinear interpolation
51			*/
52		✗	INTERPOLATE_METHOD(interpolate_bilinear)
53			{
54			int x_c, x_f, y_c, y_f;
55			int v1, v2, v3, v4;
56
57		✗	if (x < -1 || x > width || y < -1 || y > height) {
58		✗	return def;
59			} else {
60		✗	x_f = (int)x;
61		✗	x_c = x_f + 1;
62
63		✗	y_f = (int)y;
64		✗	y_c = y_f + 1;
65
66		✗	v1 = PIXEL(src, x_c, y_c, width, height, stride, def);
67		✗	v2 = PIXEL(src, x_c, y_f, width, height, stride, def);
68		✗	v3 = PIXEL(src, x_f, y_c, width, height, stride, def);
69		✗	v4 = PIXEL(src, x_f, y_f, width, height, stride, def);
70
71		✗	return (v1*(x - x_f)*(y - y_f) + v2*((x - x_f)*(y_c - y)) +
72		✗	v3*(x_c - x)*(y - y_f) + v4*((x_c - x)*(y_c - y)));
73			}
74			}
75
76			/**
77			* Biquadratic interpolation
78			*/
79		✗	INTERPOLATE_METHOD(interpolate_biquadratic)
80			{
81			int x_c, x_f, y_c, y_f;
82			uint8_t v1, v2, v3, v4;
83			float f1, f2, f3, f4;
84
85		✗	if (x < - 1 || x > width || y < -1 || y > height)
86		✗	return def;
87			else {
88		✗	x_f = (int)x;
89		✗	x_c = x_f + 1;
90		✗	y_f = (int)y;
91		✗	y_c = y_f + 1;
92
93		✗	v1 = PIXEL(src, x_c, y_c, width, height, stride, def);
94		✗	v2 = PIXEL(src, x_c, y_f, width, height, stride, def);
95		✗	v3 = PIXEL(src, x_f, y_c, width, height, stride, def);
96		✗	v4 = PIXEL(src, x_f, y_f, width, height, stride, def);
97
98		✗	f1 = 1 - sqrt((x_c - x) * (y_c - y));
99		✗	f2 = 1 - sqrt((x_c - x) * (y - y_f));
100		✗	f3 = 1 - sqrt((x - x_f) * (y_c - y));
101		✗	f4 = 1 - sqrt((x - x_f) * (y - y_f));
102		✗	return (v1 * f1 + v2 * f2 + v3 * f3 + v4 * f4) / (f1 + f2 + f3 + f4);
103			}
104			}
105
106		✗	void ff_get_matrix(
107			float x_shift,
108			float y_shift,
109			float angle,
110			float scale_x,
111			float scale_y,
112			float *matrix
113			) {
114		✗	matrix[0] = scale_x * cos(angle);
115		✗	matrix[1] = -sin(angle);
116		✗	matrix[2] = x_shift;
117		✗	matrix[3] = -matrix[1];
118		✗	matrix[4] = scale_y * cos(angle);
119		✗	matrix[5] = y_shift;
120		✗	matrix[6] = 0;
121		✗	matrix[7] = 0;
122		✗	matrix[8] = 1;
123		✗	}
124
125		✗	int ff_affine_transform(const uint8_t *src, uint8_t *dst,
126			int src_stride, int dst_stride,
127			int width, int height, const float *matrix,
128			enum InterpolateMethod interpolate,
129			enum FillMethod fill)
130			{
131			int x, y;
132			float x_s, y_s;
133		✗	uint8_t def = 0;
134		✗	uint8_t (*func)(float, float, const uint8_t *, int, int, int, uint8_t) = NULL;
135
136		✗	switch(interpolate) {
137		✗	case INTERPOLATE_NEAREST:
138		✗	func = interpolate_nearest;
139		✗	break;
140		✗	case INTERPOLATE_BILINEAR:
141		✗	func = interpolate_bilinear;
142		✗	break;
143		✗	case INTERPOLATE_BIQUADRATIC:
144		✗	func = interpolate_biquadratic;
145		✗	break;
146		✗	default:
147		✗	return AVERROR(EINVAL);
148			}
149
150		✗	for (y = 0; y < height; y++) {
151		✗	for(x = 0; x < width; x++) {
152		✗	x_s = x * matrix[0] + y * matrix[1] + matrix[2];
153		✗	y_s = x * matrix[3] + y * matrix[4] + matrix[5];
154
155		✗	switch(fill) {
156		✗	case FILL_ORIGINAL:
157		✗	def = src[y * src_stride + x];
158		✗	break;
159		✗	case FILL_CLAMP:
160		✗	y_s = av_clipf(y_s, 0, height - 1);
161		✗	x_s = av_clipf(x_s, 0, width - 1);
162		✗	def = src[(int)y_s * src_stride + (int)x_s];
163		✗	break;
164		✗	case FILL_MIRROR:
165		✗	x_s = avpriv_mirror(x_s, width-1);
166		✗	y_s = avpriv_mirror(y_s, height-1);
167
168			av_assert2(x_s >= 0 && y_s >= 0);
169			av_assert2(x_s < width && y_s < height);
170		✗	def = src[(int)y_s * src_stride + (int)x_s];
171			}
172
173		✗	dst[y * dst_stride + x] = func(x_s, y_s, src, width, height, src_stride, def);
174			}
175			}
176		✗	return 0;
177			}
178