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137 lines
3.9 KiB
C
137 lines
3.9 KiB
C
/* Libart_LGPL - library of basic graphic primitives
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* Copyright (C) 1998 Raph Levien
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include "art_misc.h"
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#include "art_uta.h"
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#include "art_rect.h"
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#include "art_rect_uta.h"
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/* Functions to decompose a microtile array into a list of rectangles. */
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/**
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* art_rect_list_from_uta: Decompose uta into list of rectangles.
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* @uta: The source uta.
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* @max_width: The maximum width of the resulting rectangles.
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* @max_height: The maximum height of the resulting rectangles.
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* @p_nrects: Where to store the number of returned rectangles.
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*
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* Allocates a new list of rectangles, sets *@p_nrects to the number
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* in the list. This list should be freed with art_free().
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*
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* Each rectangle bounded in size by (@max_width, @max_height).
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* However, these bounds must be at least the size of one tile.
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*
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* This routine provides a precise implementation, i.e. the rectangles
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* cover exactly the same area as the uta. It is thus appropriate in
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* cases where the overhead per rectangle is small compared with the
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* cost of filling in extra pixels.
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*
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* Return value: An array containing the resulting rectangles.
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**/
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ArtIRect *
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art_rect_list_from_uta (ArtUta *uta, int max_width, int max_height,
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int *p_nrects)
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{
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ArtIRect *rects;
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int n_rects, n_rects_max;
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int x, y;
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int width, height;
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int ix;
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int left_ix;
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ArtUtaBbox *utiles;
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ArtUtaBbox bb;
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int x0, y0, x1, y1;
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int *glom;
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int glom_rect;
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n_rects = 0;
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n_rects_max = 1;
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rects = art_new (ArtIRect, n_rects_max);
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width = uta->width;
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height = uta->height;
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utiles = uta->utiles;
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glom = art_new (int, width * height);
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for (ix = 0; ix < width * height; ix++)
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glom[ix] = -1;
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ix = 0;
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for (y = 0; y < height; y++)
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for (x = 0; x < width; x++)
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{
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bb = utiles[ix];
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if (bb)
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{
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x0 = ((uta->x0 + x) << ART_UTILE_SHIFT) + ART_UTA_BBOX_X0(bb);
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y0 = ((uta->y0 + y) << ART_UTILE_SHIFT) + ART_UTA_BBOX_Y0(bb);
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y1 = ((uta->y0 + y) << ART_UTILE_SHIFT) + ART_UTA_BBOX_Y1(bb);
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left_ix = ix;
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/* now try to extend to the right */
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while (x != width - 1 &&
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ART_UTA_BBOX_X1(bb) == ART_UTILE_SIZE &&
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(((bb & 0xffffff) ^ utiles[ix + 1]) & 0xffff00ff) == 0 &&
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(((uta->x0 + x + 1) << ART_UTILE_SHIFT) +
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ART_UTA_BBOX_X1(utiles[ix + 1]) -
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x0) <= max_width)
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{
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bb = utiles[ix + 1];
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ix++;
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x++;
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}
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x1 = ((uta->x0 + x) << ART_UTILE_SHIFT) + ART_UTA_BBOX_X1(bb);
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/* if rectangle nonempty */
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if ((x1 ^ x0) | (y1 ^ y0))
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{
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/* try to glom onto an existing rectangle */
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glom_rect = glom[left_ix];
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if (glom_rect != -1 &&
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x0 == rects[glom_rect].x0 &&
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x1 == rects[glom_rect].x1 &&
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y0 == rects[glom_rect].y1 &&
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y1 - rects[glom_rect].y0 <= max_height)
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{
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rects[glom_rect].y1 = y1;
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}
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else
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{
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if (n_rects == n_rects_max)
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art_expand (rects, ArtIRect, n_rects_max);
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rects[n_rects].x0 = x0;
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rects[n_rects].y0 = y0;
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rects[n_rects].x1 = x1;
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rects[n_rects].y1 = y1;
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glom_rect = n_rects;
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n_rects++;
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}
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if (y != height - 1)
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glom[left_ix + width] = glom_rect;
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}
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}
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ix++;
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}
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art_free (glom);
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*p_nrects = n_rects;
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return rects;
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}
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