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/*
* Copyright 1998-1999 Precision Insight, Inc., Cedar Park, Texas. All Rights Reserved.
* Copyright (c) 2005 Jesse Barnes <jbarnes@virtuousgeek.org>
* Copyright © 2010 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Authors:
* Jesse Barns <jbarnes@virtuousgeek.org>
* Chris Wilson <chris@chris-wilson.co.uk>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "sna.h"
/**
* Returns whether the provided transform is affine.
*
* transform may be null.
*/
bool sna_transform_is_affine(const PictTransform *t)
{
if (t == NULL)
return true;
return t->matrix[2][0] == 0 && t->matrix[2][1] == 0;
}
bool
sna_transform_is_translation(const PictTransform *t,
pixman_fixed_t *tx,
pixman_fixed_t *ty)
{
if (t == NULL) {
*tx = *ty = 0;
return true;
}
if (t->matrix[0][0] != IntToxFixed(1) ||
t->matrix[0][1] != 0 ||
t->matrix[1][0] != 0 ||
t->matrix[1][1] != IntToxFixed(1) ||
t->matrix[2][0] != 0 ||
t->matrix[2][1] != 0 ||
t->matrix[2][2] != IntToxFixed(1))
return false;
*tx = t->matrix[0][2];
*ty = t->matrix[1][2];
return true;
}
bool
sna_transform_is_integer_translation(const PictTransform *t, int16_t *tx, int16_t *ty)
{
if (t == NULL) {
*tx = *ty = 0;
return true;
}
if (t->matrix[0][0] != IntToxFixed(1) ||
t->matrix[0][1] != 0 ||
t->matrix[1][0] != 0 ||
t->matrix[1][1] != IntToxFixed(1) ||
t->matrix[2][0] != 0 ||
t->matrix[2][1] != 0 ||
t->matrix[2][2] != IntToxFixed(1))
return false;
if (pixman_fixed_fraction(t->matrix[0][2]) ||
pixman_fixed_fraction(t->matrix[1][2]))
return false;
*tx = pixman_fixed_to_int(t->matrix[0][2]);
*ty = pixman_fixed_to_int(t->matrix[1][2]);
return true;
}
bool
sna_transform_is_imprecise_integer_translation(const PictTransform *t,
int filter, bool precise,
int16_t *tx, int16_t *ty)
{
if (t == NULL) {
DBG(("%s: no transform\n", __FUNCTION__));
*tx = *ty = 0;
return true;
}
DBG(("%s: FilterNearest?=%d, precise?=%d, transform=[%f %f %f, %f %f %f, %f %f %f]\n",
__FUNCTION__, filter==PictFilterNearest, precise,
t->matrix[0][0]/65536., t->matrix[0][1]/65536., t->matrix[0][2]/65536.,
t->matrix[1][0]/65536., t->matrix[1][1]/65536., t->matrix[1][2]/65536.,
t->matrix[2][0]/65536., t->matrix[2][1]/65536., t->matrix[2][2]/65536.));
if (t->matrix[0][0] != IntToxFixed(1) ||
t->matrix[0][1] != 0 ||
t->matrix[1][0] != 0 ||
t->matrix[1][1] != IntToxFixed(1) ||
t->matrix[2][0] != 0 ||
t->matrix[2][1] != 0 ||
t->matrix[2][2] != IntToxFixed(1)) {
DBG(("%s: not unity scaling\n", __FUNCTION__));
return false;
}
if (filter != PictFilterNearest) {
if (precise) {
if (pixman_fixed_fraction(t->matrix[0][2]) ||
pixman_fixed_fraction(t->matrix[1][2])) {
DBG(("%s: precise, fractional translation\n", __FUNCTION__));
return false;
}
} else {
int f;
f = pixman_fixed_fraction(t->matrix[0][2]);
if (f > IntToxFixed(1)/4 && f < IntToxFixed(3)/4) {
DBG(("%s: imprecise, fractional translation X: %x\n", __FUNCTION__, f));
return false;
}
f = pixman_fixed_fraction(t->matrix[1][2]);
if (f > IntToxFixed(1)/4 && f < IntToxFixed(3)/4) {
DBG(("%s: imprecise, fractional translation Y: %x\n", __FUNCTION__, f));
return false;
}
}
}
*tx = pixman_fixed_to_int(t->matrix[0][2] + IntToxFixed(1)/2);
*ty = pixman_fixed_to_int(t->matrix[1][2] + IntToxFixed(1)/2);
return true;
}
/**
* Returns the floating-point coordinates transformed by the given transform.
*/
void
sna_get_transformed_coordinates(int x, int y,
const PictTransform *transform,
float *x_out, float *y_out)
{
if (transform == NULL) {
*x_out = x;
*y_out = y;
} else
_sna_get_transformed_coordinates(x, y, transform, x_out, y_out);
}
/**
* Returns the un-normalized floating-point coordinates transformed by the given transform.
*/
void
sna_get_transformed_coordinates_3d(int x, int y,
const PictTransform *transform,
float *x_out, float *y_out, float *w_out)
{
if (transform == NULL) {
*x_out = x;
*y_out = y;
*w_out = 1;
} else {
int64_t result[3];
if (_sna_transform_point(transform, x, y, result)) {
*x_out = result[0] / 65536.;
*y_out = result[1] / 65536.;
*w_out = result[2] / 65536.;
} else {
*x_out = *y_out = 0;
*w_out = 1.;
}
}
}
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