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| 4251 | Serge | 1 | /* |
| 2 | * Copyright 1998-1999 Precision Insight, Inc., Cedar Park, Texas. All Rights Reserved. |
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| 3 | * Copyright (c) 2005 Jesse Barnes |
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| 4 | * Copyright © 2010 Intel Corporation |
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| 5 | * |
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| 6 | * Permission is hereby granted, free of charge, to any person obtaining a |
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| 7 | * copy of this software and associated documentation files (the "Software"), |
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| 8 | * to deal in the Software without restriction, including without limitation |
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| 9 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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| 10 | * and/or sell copies of the Software, and to permit persons to whom the |
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| 11 | * Software is furnished to do so, subject to the following conditions: |
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| 12 | * |
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| 13 | * The above copyright notice and this permission notice (including the next |
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| 14 | * paragraph) shall be included in all copies or substantial portions of the |
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| 15 | * Software. |
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| 16 | * |
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| 17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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| 18 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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| 19 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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| 20 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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| 21 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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| 22 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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| 23 | * SOFTWARE. |
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| 24 | * |
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| 25 | * Authors: |
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| 26 | * Jesse Barns |
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| 27 | * Chris Wilson |
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| 28 | */ |
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| 29 | |||
| 30 | #ifdef HAVE_CONFIG_H |
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| 31 | #include "config.h" |
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| 32 | #endif |
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| 33 | |||
| 34 | #include "sna.h" |
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| 35 | |||
| 36 | #define pixman_fixed_e ((pixman_fixed_t) 1) |
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| 37 | #define pixman_fixed_1 (pixman_int_to_fixed(1)) |
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| 38 | #define pixman_fixed_1_minus_e (pixman_fixed_1 - pixman_fixed_e) |
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| 39 | #define pixman_fixed_to_int(f) ((int) ((f) >> 16)) |
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| 40 | #define pixman_int_to_fixed(i) ((pixman_fixed_t) ((i) << 16)) |
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| 41 | #define pixman_fixed_fraction(f) ((f) & pixman_fixed_1_minus_e) |
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| 42 | |||
| 43 | #define IntToxFixed(i) pixman_int_to_fixed(i) |
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| 44 | |||
| 45 | /** |
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| 46 | * Returns whether the provided transform is affine. |
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| 47 | * |
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| 48 | * transform may be null. |
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| 49 | */ |
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| 50 | bool sna_transform_is_affine(const PictTransform *t) |
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| 51 | { |
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| 52 | if (t == NULL) |
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| 53 | return true; |
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| 54 | |||
| 55 | return t->matrix[2][0] == 0 && t->matrix[2][1] == 0; |
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| 56 | } |
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| 57 | |||
| 58 | bool |
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| 59 | sna_transform_is_translation(const PictTransform *t, |
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| 60 | pixman_fixed_t *tx, |
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| 61 | pixman_fixed_t *ty) |
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| 62 | { |
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| 63 | if (t == NULL) { |
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| 64 | *tx = *ty = 0; |
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| 65 | return true; |
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| 66 | } |
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| 67 | |||
| 68 | if (t->matrix[0][0] != IntToxFixed(1) || |
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| 69 | t->matrix[0][1] != 0 || |
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| 70 | t->matrix[1][0] != 0 || |
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| 71 | t->matrix[1][1] != IntToxFixed(1) || |
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| 72 | t->matrix[2][0] != 0 || |
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| 73 | t->matrix[2][1] != 0 || |
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| 74 | t->matrix[2][2] != IntToxFixed(1)) |
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| 75 | return false; |
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| 76 | |||
| 77 | *tx = t->matrix[0][2]; |
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| 78 | *ty = t->matrix[1][2]; |
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| 79 | return true; |
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| 80 | } |
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| 81 | |||
| 82 | bool |
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| 83 | sna_transform_is_integer_translation(const PictTransform *t, int16_t *tx, int16_t *ty) |
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| 84 | { |
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| 85 | if (t == NULL) { |
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| 86 | *tx = *ty = 0; |
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| 87 | return true; |
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| 88 | } |
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| 89 | |||
| 90 | if (t->matrix[0][0] != IntToxFixed(1) || |
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| 91 | t->matrix[0][1] != 0 || |
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| 92 | t->matrix[1][0] != 0 || |
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| 93 | t->matrix[1][1] != IntToxFixed(1) || |
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| 94 | t->matrix[2][0] != 0 || |
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| 95 | t->matrix[2][1] != 0 || |
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| 96 | t->matrix[2][2] != IntToxFixed(1)) |
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| 97 | return false; |
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| 98 | |||
| 99 | if (pixman_fixed_fraction(t->matrix[0][2]) || |
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| 100 | pixman_fixed_fraction(t->matrix[1][2])) |
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| 101 | return false; |
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| 102 | |||
| 103 | *tx = pixman_fixed_to_int(t->matrix[0][2]); |
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| 104 | *ty = pixman_fixed_to_int(t->matrix[1][2]); |
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| 105 | return true; |
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| 106 | } |
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| 107 | |||
| 108 | /** |
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| 109 | * Returns the floating-point coordinates transformed by the given transform. |
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| 110 | */ |
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| 111 | void |
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| 112 | sna_get_transformed_coordinates(int x, int y, |
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| 113 | const PictTransform *transform, |
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| 114 | float *x_out, float *y_out) |
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| 115 | { |
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| 116 | if (transform == NULL) { |
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| 117 | *x_out = x; |
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| 118 | *y_out = y; |
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| 119 | } else |
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| 120 | _sna_get_transformed_coordinates(x, y, transform, x_out, y_out); |
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| 121 | } |
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| 122 | |||
| 123 | /** |
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| 124 | * Returns the un-normalized floating-point coordinates transformed by the given transform. |
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| 125 | */ |
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| 126 | void |
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| 127 | sna_get_transformed_coordinates_3d(int x, int y, |
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| 128 | const PictTransform *transform, |
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| 129 | float *x_out, float *y_out, float *w_out) |
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| 130 | { |
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| 131 | if (transform == NULL) { |
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| 132 | *x_out = x; |
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| 133 | *y_out = y; |
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| 134 | *w_out = 1; |
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| 135 | } else { |
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| 136 | int64_t result[3]; |
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| 137 | |||
| 138 | if (_sna_transform_point(transform, x, y, result)) { |
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| 139 | *x_out = result[0] / 65536.; |
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| 140 | *y_out = result[1] / 65536.; |
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| 141 | *w_out = result[2] / 65536.; |
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| 142 | } else { |
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| 143 | *x_out = *y_out = 0; |
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| 144 | *w_out = 1.; |
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| 145 | } |
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| 146 | } |
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| 147 | } |