1 /*
2 * Copyright 1998-1999 Precision Insight, Inc., Cedar Park, Texas. All Rights Reserved.
3 * Copyright (c) 2005 Jesse Barnes <jbarnes@virtuousgeek.org>
4 * Copyright © 2010 Intel Corporation
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice (including the next
14 * paragraph) shall be included in all copies or substantial portions of the
15 * Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 * SOFTWARE.
24 *
25 * Authors:
26 * Jesse Barns <jbarnes@virtuousgeek.org>
27 * Chris Wilson <chris@chris-wilson.co.uk>
28 */
29
30 #ifdef HAVE_CONFIG_H
31 #include "config.h"
32 #endif
33
34 #include "sna.h"
35
36 /**
37 * Returns whether the provided transform is affine.
38 *
39 * transform may be null.
40 */
sna_transform_is_affine(const PictTransform * t)41 bool sna_transform_is_affine(const PictTransform *t)
42 {
43 if (t == NULL)
44 return true;
45
46 return t->matrix[2][0] == 0 && t->matrix[2][1] == 0;
47 }
48
49 bool
sna_transform_is_translation(const PictTransform * t,pixman_fixed_t * tx,pixman_fixed_t * ty)50 sna_transform_is_translation(const PictTransform *t,
51 pixman_fixed_t *tx,
52 pixman_fixed_t *ty)
53 {
54 if (t == NULL) {
55 *tx = *ty = 0;
56 return true;
57 }
58
59 if (t->matrix[0][0] != IntToxFixed(1) ||
60 t->matrix[0][1] != 0 ||
61 t->matrix[1][0] != 0 ||
62 t->matrix[1][1] != IntToxFixed(1) ||
63 t->matrix[2][0] != 0 ||
64 t->matrix[2][1] != 0 ||
65 t->matrix[2][2] != IntToxFixed(1))
66 return false;
67
68 *tx = t->matrix[0][2];
69 *ty = t->matrix[1][2];
70 return true;
71 }
72
73 bool
sna_transform_is_integer_translation(const PictTransform * t,int16_t * tx,int16_t * ty)74 sna_transform_is_integer_translation(const PictTransform *t, int16_t *tx, int16_t *ty)
75 {
76 if (t == NULL) {
77 *tx = *ty = 0;
78 return true;
79 }
80
81 if (t->matrix[0][0] != IntToxFixed(1) ||
82 t->matrix[0][1] != 0 ||
83 t->matrix[1][0] != 0 ||
84 t->matrix[1][1] != IntToxFixed(1) ||
85 t->matrix[2][0] != 0 ||
86 t->matrix[2][1] != 0 ||
87 t->matrix[2][2] != IntToxFixed(1))
88 return false;
89
90 if (pixman_fixed_fraction(t->matrix[0][2]) ||
91 pixman_fixed_fraction(t->matrix[1][2]))
92 return false;
93
94 *tx = pixman_fixed_to_int(t->matrix[0][2]);
95 *ty = pixman_fixed_to_int(t->matrix[1][2]);
96 return true;
97 }
98
99 bool
sna_transform_is_imprecise_integer_translation(const PictTransform * t,int filter,bool precise,int16_t * tx,int16_t * ty)100 sna_transform_is_imprecise_integer_translation(const PictTransform *t,
101 int filter, bool precise,
102 int16_t *tx, int16_t *ty)
103 {
104 if (t == NULL) {
105 DBG(("%s: no transform\n", __FUNCTION__));
106 *tx = *ty = 0;
107 return true;
108 }
109
110 DBG(("%s: FilterNearest?=%d, precise?=%d, transform=[%f %f %f, %f %f %f, %f %f %f]\n",
111 __FUNCTION__, filter==PictFilterNearest, precise,
112 t->matrix[0][0]/65536., t->matrix[0][1]/65536., t->matrix[0][2]/65536.,
113 t->matrix[1][0]/65536., t->matrix[1][1]/65536., t->matrix[1][2]/65536.,
114 t->matrix[2][0]/65536., t->matrix[2][1]/65536., t->matrix[2][2]/65536.));
115
116 if (t->matrix[0][0] != IntToxFixed(1) ||
117 t->matrix[0][1] != 0 ||
118 t->matrix[1][0] != 0 ||
119 t->matrix[1][1] != IntToxFixed(1) ||
120 t->matrix[2][0] != 0 ||
121 t->matrix[2][1] != 0 ||
122 t->matrix[2][2] != IntToxFixed(1)) {
123 DBG(("%s: not unity scaling\n", __FUNCTION__));
124 return false;
125 }
126
127 if (filter != PictFilterNearest) {
128 if (precise) {
129 if (pixman_fixed_fraction(t->matrix[0][2]) ||
130 pixman_fixed_fraction(t->matrix[1][2])) {
131 DBG(("%s: precise, fractional translation\n", __FUNCTION__));
132 return false;
133 }
134 } else {
135 int f;
136
137 f = pixman_fixed_fraction(t->matrix[0][2]);
138 if (f > IntToxFixed(1)/4 && f < IntToxFixed(3)/4) {
139 DBG(("%s: imprecise, fractional translation X: %x\n", __FUNCTION__, f));
140 return false;
141 }
142
143 f = pixman_fixed_fraction(t->matrix[1][2]);
144 if (f > IntToxFixed(1)/4 && f < IntToxFixed(3)/4) {
145 DBG(("%s: imprecise, fractional translation Y: %x\n", __FUNCTION__, f));
146 return false;
147 }
148 }
149 }
150
151 *tx = pixman_fixed_to_int(t->matrix[0][2] + IntToxFixed(1)/2);
152 *ty = pixman_fixed_to_int(t->matrix[1][2] + IntToxFixed(1)/2);
153 return true;
154 }
155
156 /**
157 * Returns the floating-point coordinates transformed by the given transform.
158 */
159 void
sna_get_transformed_coordinates(int x,int y,const PictTransform * transform,float * x_out,float * y_out)160 sna_get_transformed_coordinates(int x, int y,
161 const PictTransform *transform,
162 float *x_out, float *y_out)
163 {
164 if (transform == NULL) {
165 *x_out = x;
166 *y_out = y;
167 } else
168 _sna_get_transformed_coordinates(x, y, transform, x_out, y_out);
169 }
170
171 /**
172 * Returns the un-normalized floating-point coordinates transformed by the given transform.
173 */
174 void
sna_get_transformed_coordinates_3d(int x,int y,const PictTransform * transform,float * x_out,float * y_out,float * w_out)175 sna_get_transformed_coordinates_3d(int x, int y,
176 const PictTransform *transform,
177 float *x_out, float *y_out, float *w_out)
178 {
179 if (transform == NULL) {
180 *x_out = x;
181 *y_out = y;
182 *w_out = 1;
183 } else {
184 int64_t result[3];
185
186 if (_sna_transform_point(transform, x, y, result)) {
187 *x_out = result[0] / 65536.;
188 *y_out = result[1] / 65536.;
189 *w_out = result[2] / 65536.;
190 } else {
191 *x_out = *y_out = 0;
192 *w_out = 1.;
193 }
194 }
195 }
196