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