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64 lines
2 KiB
C
64 lines
2 KiB
C
/*
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* Copyright © 2000 SuSE, Inc.
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that
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* copyright notice and this permission notice appear in supporting
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* documentation, and that the name of SuSE not be used in advertising or
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* publicity pertaining to distribution of the software without specific,
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* written prior permission. SuSE makes no representations about the
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* suitability of this software for any purpose. It is provided "as is"
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* without express or implied warranty.
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*
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* SuSE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL SuSE
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* BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* Author: Keith Packard, SuSE, Inc.
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*/
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#include "icint.h"
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#define MAX_FIXED_48_16 ((xFixed_48_16) 0x7fffffff)
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#define MIN_FIXED_48_16 (-((xFixed_48_16) 1 << 31))
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int
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pixman_transform_point (pixman_transform_t *transform,
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pixman_vector_t *vector)
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{
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pixman_vector_t result;
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int i, j;
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xFixed_32_32 partial;
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xFixed_48_16 v;
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for (j = 0; j < 3; j++)
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{
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v = 0;
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for (i = 0; i < 3; i++)
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{
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partial = ((xFixed_48_16) transform->matrix[j][i] *
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(xFixed_48_16) vector->vector[i]);
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v += partial >> 16;
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}
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if (v > MAX_FIXED_48_16 || v < MIN_FIXED_48_16)
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return 0;
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result.vector[j] = (xFixed) v;
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}
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if (!result.vector[2])
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return 0;
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for (j = 0; j < 2; j++)
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{
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partial = (xFixed_48_16) result.vector[j] << 16;
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v = partial / result.vector[2];
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if (v > MAX_FIXED_48_16 || v < MIN_FIXED_48_16)
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return 0;
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vector->vector[j] = (xFixed) v;
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}
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vector->vector[2] = xFixed1;
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return 1;
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}
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