160 lines
4.0 KiB
C
160 lines
4.0 KiB
C
/*
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* Copyright © 2004 Keith Packard
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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 Keith Packard not be used in
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* advertising or publicity pertaining to distribution of the software without
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* specific, written prior permission. Keith Packard makes no
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* representations about the suitability of this software for any purpose. It
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* is provided "as is" without express or implied warranty.
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*
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* KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifdef HAVE_DIX_CONFIG_H
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#include <dix-config.h>
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#endif
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#include "fb.h"
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#include "picturestr.h"
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#include "mipict.h"
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#include "fbpict.h"
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void
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fbAddTraps (PicturePtr pPicture,
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INT16 x_off,
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INT16 y_off,
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int ntrap,
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xTrap *traps)
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{
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int image_xoff, image_yoff;
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pixman_image_t *image = image_from_pict (pPicture, FALSE, &image_xoff, &image_yoff);
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if (!image)
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return;
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pixman_add_traps (image, x_off, y_off, ntrap, (pixman_trap_t *)traps);
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free_pixman_pict (pPicture, image);
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}
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void
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fbRasterizeTrapezoid (PicturePtr pPicture,
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xTrapezoid *trap,
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int x_off,
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int y_off)
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{
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int mask_xoff, mask_yoff;
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pixman_image_t *image = image_from_pict (pPicture, FALSE, &mask_xoff, &mask_yoff);
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if (!image)
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return;
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pixman_rasterize_trapezoid (image, (pixman_trapezoid_t *)trap, x_off, y_off);
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free_pixman_pict (pPicture, image);
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}
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static int
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_GreaterY (xPointFixed *a, xPointFixed *b)
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{
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if (a->y == b->y)
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return a->x > b->x;
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return a->y > b->y;
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}
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/*
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* Note that the definition of this function is a bit odd because
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* of the X coordinate space (y increasing downwards).
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*/
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static int
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_Clockwise (xPointFixed *ref, xPointFixed *a, xPointFixed *b)
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{
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xPointFixed ad, bd;
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ad.x = a->x - ref->x;
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ad.y = a->y - ref->y;
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bd.x = b->x - ref->x;
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bd.y = b->y - ref->y;
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return ((xFixed_32_32) bd.y * ad.x - (xFixed_32_32) ad.y * bd.x) < 0;
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}
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/* FIXME -- this could be made more efficient */
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void
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fbAddTriangles (PicturePtr pPicture,
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INT16 x_off,
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INT16 y_off,
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int ntri,
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xTriangle *tris)
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{
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xPointFixed *top, *left, *right, *tmp;
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xTrapezoid trap;
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for (; ntri; ntri--, tris++)
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{
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top = &tris->p1;
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left = &tris->p2;
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right = &tris->p3;
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if (_GreaterY (top, left)) {
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tmp = left; left = top; top = tmp;
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}
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if (_GreaterY (top, right)) {
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tmp = right; right = top; top = tmp;
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}
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if (_Clockwise (top, right, left)) {
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tmp = right; right = left; left = tmp;
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}
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/*
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* Two cases:
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*
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* + +
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* / \ / \
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* / \ / \
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* / + + \
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* / -- -- \
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* / -- -- \
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* / --- --- \
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* +-- --+
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*/
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trap.top = top->y;
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trap.left.p1 = *top;
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trap.left.p2 = *left;
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trap.right.p1 = *top;
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trap.right.p2 = *right;
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if (right->y < left->y)
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trap.bottom = right->y;
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else
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trap.bottom = left->y;
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fbRasterizeTrapezoid (pPicture, &trap, x_off, y_off);
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if (right->y < left->y)
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{
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trap.top = right->y;
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trap.bottom = left->y;
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trap.right.p1 = *right;
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trap.right.p2 = *left;
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}
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else
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{
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trap.top = left->y;
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trap.bottom = right->y;
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trap.left.p1 = *left;
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trap.left.p2 = *right;
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}
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fbRasterizeTrapezoid (pPicture, &trap, x_off, y_off);
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}
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}
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