mirror of
https://gitlab.freedesktop.org/cairo/cairo.git
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105 lines
2.6 KiB
C
105 lines
2.6 KiB
C
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/*
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* $XFree86: $
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*
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* Copyright <EFBFBD> 2002 Carl D. Worth
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*
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* Permission to use, copy, modify, distribute, and sell this software
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* and its documentation for any purpose is hereby granted without
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* fee, provided that the above copyright notice appear in all copies
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* and that both that copyright notice and this permission notice
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* appear in supporting documentation, and that the name of Carl
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* D. Worth not be used in advertising or publicity pertaining to
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* distribution of the software without specific, written prior
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* permission. Carl D. Worth makes no representations about the
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* suitability of this software for any purpose. It is provided "as
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* is" without express or implied warranty.
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*
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* CARL D. WORTH DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
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* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS, IN NO EVENT SHALL CARL D. WORTH BE LIABLE FOR ANY SPECIAL,
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* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
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* 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
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* IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <stdlib.h>
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#include "xrint.h"
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#define XR_POLYGON_GROWTH_INC 10
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/* private functions */
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static void
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_XrPolygonGrowBy(XrPolygon *poly, int additional);
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void
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XrPolygonInit(XrPolygon *poly)
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{
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poly->num_edges = 0;
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poly->edges_size = 0;
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poly->edges = NULL;
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}
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void
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XrPolygonDeinit(XrPolygon *poly)
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{
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if (poly->edges_size) {
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free(poly->edges);
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poly->edges_size = 0;
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poly->num_edges = 0;
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}
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}
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static void
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_XrPolygonGrowBy(XrPolygon *poly, int additional)
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{
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XrEdge *new_edges;
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int old_size = poly->edges_size;
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int new_size = poly->num_edges + additional;
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if (new_size <= poly->edges_size) {
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return;
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}
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poly->edges_size = new_size;
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new_edges = realloc(poly->edges, poly->edges_size * sizeof(XrEdge));
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if (new_edges) {
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poly->edges = new_edges;
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} else {
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/* XXX: BUG: How do we really want to handle this out of memory error? */
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poly->edges_size = old_size;
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}
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}
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void
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XrPolygonAddEdge(void *closure, XPointFixed *p1, XPointFixed *p2)
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{
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XrEdge *edge;
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XrPolygon *poly = closure;
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/* drop horizontal edges */
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if (p1->y == p2->y) {
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return;
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}
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if (poly->num_edges >= poly->edges_size) {
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_XrPolygonGrowBy(poly, XR_POLYGON_GROWTH_INC);
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}
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edge = &poly->edges[poly->num_edges];
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if (p1->y < p2->y) {
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edge->edge.p1 = *p1;
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edge->edge.p2 = *p2;
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edge->clockWise = True;
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} else {
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edge->edge.p1 = *p2;
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edge->edge.p2 = *p1;
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edge->clockWise = False;
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}
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poly->num_edges++;
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}
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