97 lines
2.7 KiB
C
97 lines
2.7 KiB
C
/*
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* Copyright 2011 Ole Loots <ole@monochrom.net>
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*
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* This file is part of NetSurf, http://www.netsurf-browser.org/
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*
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* NetSurf is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* NetSurf 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdbool.h>
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#include "windom.h"
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#include "utils/types.h"
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#include "atari/redrawslots.h"
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void redraw_slots_init(struct s_redrw_slots * slots, short size)
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{
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slots->size = MIN( MAX_REDRW_SLOTS , size);
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slots->areas_used = 0;
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}
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static inline bool rect_intersect( struct rect * box1, struct rect * box2 )
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{
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if (box2->x1 < box1->x0)
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return false;
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if (box2->y1 < box1->y0)
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return false;
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if (box2->x0 > box1->x1)
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return false;
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if (box2->y0 > box1->y1)
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return false;
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return true;
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}
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/*
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schedule a slots, coords are relative.
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*/
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void redraw_slot_schedule(struct s_redrw_slots * slots, short x0, short y0, short x1, short y1)
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{
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int i;
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struct rect area;
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area.x0 = x0;
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area.y0 = y0;
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area.x1 = x1;
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area.y1 = y1;
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for( i=0; i<slots->areas_used; i++) {
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if( slots->areas[i].x0 <= x0
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&& slots->areas[i].x1 >= x1
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&& slots->areas[i].y0 <= y0
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&& slots->areas[i].y1 >= y1 ){
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/* the area is already queued for redraw */
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return;
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} else {
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if( rect_intersect(&slots->areas[i], &area ) ){
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slots->areas[i].x0 = MIN(slots->areas[i].x0, x0);
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slots->areas[i].y0 = MIN(slots->areas[i].y0, y0);
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slots->areas[i].x1 = MAX(slots->areas[i].x1, x1);
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slots->areas[i].y1 = MAX(slots->areas[i].y1, y1);
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return;
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}
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}
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}
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if( slots->areas_used < slots->size ) {
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slots->areas[slots->areas_used].x0 = x0;
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slots->areas[slots->areas_used].x1 = x1;
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slots->areas[slots->areas_used].y0 = y0;
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slots->areas[slots->areas_used].y1 = y1;
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slots->areas_used++;
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} else {
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/*
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we are out of available slots, merge box with last slot
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this is dumb... but also a very rare case.
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*/
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slots->areas[slots->size-1].x0 = MIN(slots->areas[i].x0, x0);
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slots->areas[slots->size-1].y0 = MIN(slots->areas[i].y0, y0);
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slots->areas[slots->size-1].x1 = MAX(slots->areas[i].x1, x1);
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slots->areas[slots->size-1].y1 = MAX(slots->areas[i].y1, y1);
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}
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done:
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return;
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}
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