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  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. #define pixman_fixed_e                  ((pixman_fixed_t) 1)
  37. #define pixman_fixed_1                  (pixman_int_to_fixed(1))
  38. #define pixman_fixed_1_minus_e          (pixman_fixed_1 - pixman_fixed_e)
  39. #define pixman_fixed_to_int(f)          ((int) ((f) >> 16))
  40. #define pixman_int_to_fixed(i)          ((pixman_fixed_t) ((i) << 16))
  41. #define pixman_fixed_fraction(f)        ((f) & pixman_fixed_1_minus_e)
  42.  
  43. #define IntToxFixed(i)  pixman_int_to_fixed(i)
  44.  
  45. /**
  46.  * Returns whether the provided transform is affine.
  47.  *
  48.  * transform may be null.
  49.  */
  50. bool sna_transform_is_affine(const PictTransform *t)
  51. {
  52.         if (t == NULL)
  53.                 return true;
  54.  
  55.         return t->matrix[2][0] == 0 && t->matrix[2][1] == 0;
  56. }
  57.  
  58. bool
  59. sna_transform_is_translation(const PictTransform *t,
  60.                              pixman_fixed_t *tx,
  61.                              pixman_fixed_t *ty)
  62. {
  63.         if (t == NULL) {
  64.                 *tx = *ty = 0;
  65.                 return true;
  66.         }
  67.  
  68.         if (t->matrix[0][0] != IntToxFixed(1) ||
  69.             t->matrix[0][1] != 0 ||
  70.             t->matrix[1][0] != 0 ||
  71.             t->matrix[1][1] != IntToxFixed(1) ||
  72.             t->matrix[2][0] != 0 ||
  73.             t->matrix[2][1] != 0 ||
  74.             t->matrix[2][2] != IntToxFixed(1))
  75.                 return false;
  76.  
  77.         *tx = t->matrix[0][2];
  78.         *ty = t->matrix[1][2];
  79.         return true;
  80. }
  81.  
  82. bool
  83. sna_transform_is_integer_translation(const PictTransform *t, int16_t *tx, int16_t *ty)
  84. {
  85.         if (t == NULL) {
  86.                 *tx = *ty = 0;
  87.                 return true;
  88.         }
  89.  
  90.         if (t->matrix[0][0] != IntToxFixed(1) ||
  91.             t->matrix[0][1] != 0 ||
  92.             t->matrix[1][0] != 0 ||
  93.             t->matrix[1][1] != IntToxFixed(1) ||
  94.             t->matrix[2][0] != 0 ||
  95.             t->matrix[2][1] != 0 ||
  96.             t->matrix[2][2] != IntToxFixed(1))
  97.                 return false;
  98.  
  99.         if (pixman_fixed_fraction(t->matrix[0][2]) ||
  100.             pixman_fixed_fraction(t->matrix[1][2]))
  101.                 return false;
  102.  
  103.         *tx = pixman_fixed_to_int(t->matrix[0][2]);
  104.         *ty = pixman_fixed_to_int(t->matrix[1][2]);
  105.         return true;
  106. }
  107.  
  108. /**
  109.  * Returns the floating-point coordinates transformed by the given transform.
  110.  */
  111. void
  112. sna_get_transformed_coordinates(int x, int y,
  113.                                 const PictTransform *transform,
  114.                                 float *x_out, float *y_out)
  115. {
  116.         if (transform == NULL) {
  117.                 *x_out = x;
  118.                 *y_out = y;
  119.         } else
  120.                 _sna_get_transformed_coordinates(x, y, transform, x_out, y_out);
  121. }
  122.  
  123. /**
  124.  * Returns the un-normalized floating-point coordinates transformed by the given transform.
  125.  */
  126. void
  127. sna_get_transformed_coordinates_3d(int x, int y,
  128.                                    const PictTransform *transform,
  129.                                    float *x_out, float *y_out, float *w_out)
  130. {
  131.         if (transform == NULL) {
  132.                 *x_out = x;
  133.                 *y_out = y;
  134.                 *w_out = 1;
  135.         } else {
  136.                 int64_t result[3];
  137.  
  138.                 if (_sna_transform_point(transform, x, y, result)) {
  139.                         *x_out = result[0] / 65536.;
  140.                         *y_out = result[1] / 65536.;
  141.                         *w_out = result[2] / 65536.;
  142.                 } else {
  143.                         *x_out = *y_out = 0;
  144.                         *w_out = 1.;
  145.                 }
  146.         }
  147. }
  148.