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110 lines
3.6 KiB
C
110 lines
3.6 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_uta_rect.h"
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/**
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* art_uta_from_irect: Generate uta covering a rectangle.
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* @bbox: The source rectangle.
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*
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* Generates a uta exactly covering @bbox. Please do not call this
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* function with a @bbox with zero height or width.
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*
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* Return value: the new uta.
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**/
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ArtUta *
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art_uta_from_irect (ArtIRect *bbox)
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{
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ArtUta *uta;
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ArtUtaBbox *utiles;
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ArtUtaBbox bb;
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int width, height;
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int x, y;
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int xf0, yf0, xf1, yf1;
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int ix;
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uta = art_new (ArtUta, 1);
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uta->x0 = bbox->x0 >> ART_UTILE_SHIFT;
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uta->y0 = bbox->y0 >> ART_UTILE_SHIFT;
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width = ((bbox->x1 + ART_UTILE_SIZE - 1) >> ART_UTILE_SHIFT) - uta->x0;
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height = ((bbox->y1 + ART_UTILE_SIZE - 1) >> ART_UTILE_SHIFT) - uta->y0;
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utiles = art_new (ArtUtaBbox, width * height);
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uta->width = width;
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uta->height = height;
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uta->utiles = utiles;
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xf0 = bbox->x0 & (ART_UTILE_SIZE - 1);
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yf0 = bbox->y0 & (ART_UTILE_SIZE - 1);
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xf1 = ((bbox->x1 - 1) & (ART_UTILE_SIZE - 1)) + 1;
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yf1 = ((bbox->y1 - 1) & (ART_UTILE_SIZE - 1)) + 1;
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if (height == 1)
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{
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if (width == 1)
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utiles[0] = ART_UTA_BBOX_CONS (xf0, yf0, xf1, yf1);
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else
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{
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utiles[0] = ART_UTA_BBOX_CONS (xf0, yf0, ART_UTILE_SIZE, yf1);
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bb = ART_UTA_BBOX_CONS (0, yf0, ART_UTILE_SIZE, yf1);
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for (x = 1; x < width - 1; x++)
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utiles[x] = bb;
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utiles[x] = ART_UTA_BBOX_CONS (0, yf0, xf1, yf1);
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}
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}
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else
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{
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if (width == 1)
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{
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utiles[0] = ART_UTA_BBOX_CONS (xf0, yf0, xf1, ART_UTILE_SIZE);
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bb = ART_UTA_BBOX_CONS (xf0, 0, xf1, ART_UTILE_SIZE);
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for (y = 1; y < height - 1; y++)
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utiles[y] = bb;
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utiles[y] = ART_UTA_BBOX_CONS (xf0, 0, xf1, yf1);
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}
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else
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{
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utiles[0] =
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ART_UTA_BBOX_CONS (xf0, yf0, ART_UTILE_SIZE, ART_UTILE_SIZE);
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bb = ART_UTA_BBOX_CONS (0, yf0, ART_UTILE_SIZE, ART_UTILE_SIZE);
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for (x = 1; x < width - 1; x++)
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utiles[x] = bb;
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utiles[x] = ART_UTA_BBOX_CONS (0, yf0, xf1, ART_UTILE_SIZE);
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ix = width;
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for (y = 1; y < height - 1; y++)
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{
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utiles[ix++] =
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ART_UTA_BBOX_CONS (xf0, 0, ART_UTILE_SIZE, ART_UTILE_SIZE);
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bb = ART_UTA_BBOX_CONS (0, 0, ART_UTILE_SIZE, ART_UTILE_SIZE);
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for (x = 1; x < width - 1; x++)
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utiles[ix++] = bb;
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utiles[ix++] = ART_UTA_BBOX_CONS (0, 0, xf1, ART_UTILE_SIZE);
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}
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utiles[ix++] = ART_UTA_BBOX_CONS (xf0, 0, ART_UTILE_SIZE, yf1);
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bb = ART_UTA_BBOX_CONS (0, 0, ART_UTILE_SIZE, yf1);
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for (x = 1; x < width - 1; x++)
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utiles[ix++] = bb;
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utiles[ix++] = ART_UTA_BBOX_CONS (0, 0, xf1, yf1);
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}
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}
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return uta;
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}
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