148 lines
4.2 KiB
C
148 lines
4.2 KiB
C
/*
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* Copyright 1998-1999 Precision Insight, Inc., Cedar Park, Texas. All Rights Reserved.
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* Copyright (c) 2005 Jesse Barnes <jbarnes@virtuousgeek.org>
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* Copyright © 2010 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* Authors:
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* Jesse Barns <jbarnes@virtuousgeek.org>
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* Chris Wilson <chris@chris-wilson.co.uk>
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "sna.h"
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#define pixman_fixed_e ((pixman_fixed_t) 1)
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#define pixman_fixed_1 (pixman_int_to_fixed(1))
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#define pixman_fixed_1_minus_e (pixman_fixed_1 - pixman_fixed_e)
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#define pixman_fixed_to_int(f) ((int) ((f) >> 16))
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#define pixman_int_to_fixed(i) ((pixman_fixed_t) ((i) << 16))
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#define pixman_fixed_fraction(f) ((f) & pixman_fixed_1_minus_e)
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#define IntToxFixed(i) pixman_int_to_fixed(i)
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/**
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* Returns whether the provided transform is affine.
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*
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* transform may be null.
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*/
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bool sna_transform_is_affine(const PictTransform *t)
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{
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if (t == NULL)
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return true;
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return t->matrix[2][0] == 0 && t->matrix[2][1] == 0;
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}
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bool
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sna_transform_is_translation(const PictTransform *t,
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pixman_fixed_t *tx,
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pixman_fixed_t *ty)
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{
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if (t == NULL) {
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*tx = *ty = 0;
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return true;
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}
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if (t->matrix[0][0] != IntToxFixed(1) ||
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t->matrix[0][1] != 0 ||
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t->matrix[1][0] != 0 ||
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t->matrix[1][1] != IntToxFixed(1) ||
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t->matrix[2][0] != 0 ||
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t->matrix[2][1] != 0 ||
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t->matrix[2][2] != IntToxFixed(1))
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return false;
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*tx = t->matrix[0][2];
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*ty = t->matrix[1][2];
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return true;
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}
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bool
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sna_transform_is_integer_translation(const PictTransform *t, int16_t *tx, int16_t *ty)
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{
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if (t == NULL) {
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*tx = *ty = 0;
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return true;
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}
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if (t->matrix[0][0] != IntToxFixed(1) ||
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t->matrix[0][1] != 0 ||
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t->matrix[1][0] != 0 ||
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t->matrix[1][1] != IntToxFixed(1) ||
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t->matrix[2][0] != 0 ||
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t->matrix[2][1] != 0 ||
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t->matrix[2][2] != IntToxFixed(1))
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return false;
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if (pixman_fixed_fraction(t->matrix[0][2]) ||
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pixman_fixed_fraction(t->matrix[1][2]))
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return false;
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*tx = pixman_fixed_to_int(t->matrix[0][2]);
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*ty = pixman_fixed_to_int(t->matrix[1][2]);
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return true;
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}
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/**
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* Returns the floating-point coordinates transformed by the given transform.
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*/
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void
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sna_get_transformed_coordinates(int x, int y,
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const PictTransform *transform,
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float *x_out, float *y_out)
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{
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if (transform == NULL) {
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*x_out = x;
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*y_out = y;
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} else
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_sna_get_transformed_coordinates(x, y, transform, x_out, y_out);
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}
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/**
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* Returns the un-normalized floating-point coordinates transformed by the given transform.
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*/
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void
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sna_get_transformed_coordinates_3d(int x, int y,
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const PictTransform *transform,
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float *x_out, float *y_out, float *w_out)
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{
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if (transform == NULL) {
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*x_out = x;
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*y_out = y;
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*w_out = 1;
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} else {
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int64_t result[3];
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if (_sna_transform_point(transform, x, y, result)) {
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*x_out = result[0] / 65536.;
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*y_out = result[1] / 65536.;
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*w_out = result[2] / 65536.;
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} else {
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*x_out = *y_out = 0;
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*w_out = 1.;
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}
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}
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}
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