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/*
* Copyright (c) 2005 Bart Coppens <kde@bartcoppens.be>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <tqpixmap.h>
#include <tqpainter.h>
#include "kis_colorspace.h"
#include "kis_iterators_pixel.h"
#include "kis_paint_device.h"
#include "kis_boundary.h"
KisBoundary::KisBoundary(KisPaintDevice* dev) {
m_device = dev;
m_fuzzyness = 255 / 2;
}
bool KisBoundary::isDark(TQ_UINT8 val) {
return val < m_fuzzyness;
}
void KisBoundary::generateBoundary(int w, int h) {
if (!m_device)
return;
KisColorSpace* cs = m_device->colorSpace();
// Horizontal
for (int currentY = - 1; currentY < h; currentY++) {
KisHLineIteratorPixel topIt = m_device->createHLineIterator(0, currentY, w, false);
KisHLineIteratorPixel botIt = m_device->createHLineIterator(0, currentY + 1, w, false);
bool darkTop;
bool darkBot;
m_horSegments.append(TQValueList<PointPair>());
while (!topIt.isDone()) {
darkTop = cs->getAlpha(topIt.rawData());
darkBot = cs->getAlpha(botIt.rawData());
if (darkTop != darkBot) {
// detected a change
m_horSegments.back().append(tqMakePair(KisPoint(botIt.x(), botIt.y()), 1));
}
++topIt;
++botIt;
}
}
// Vertical
for (int currentX = - 1; currentX < w; currentX++) {
KisVLineIteratorPixel leftIt = m_device->createVLineIterator(currentX, 0, h, false);
KisVLineIteratorPixel rightIt = m_device->createVLineIterator(currentX + 1, 0, h, false);
bool darkLeft;
bool darkRight;
m_vertSegments.append(TQValueList<PointPair>());
while (!leftIt.isDone()) {
darkLeft = cs->getAlpha(leftIt.rawData());
darkRight = cs->getAlpha(rightIt.rawData());
if (darkLeft != darkRight) {
// detected a change
m_vertSegments.back().append(tqMakePair(KisPoint(rightIt.x(), rightIt.y()), 1));
}
++leftIt;
++rightIt;
}
}
}
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