1 files changed, 83 insertions, 0 deletions
diff --git a/krita/core/kis_boundary.cc b/krita/core/kis_boundary.cc
new file mode 100644
index 00000000..24524aeb
--- /dev/null
+++ b/krita/core/kis_boundary.cc
@@ -0,0 +1,83 @@
+/*
+ *  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 <qpixmap.h>
+#include <qpainter.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(Q_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(QValueList<PointPair>());
+
+        while (!topIt.isDone()) {
+            darkTop = cs->getAlpha(topIt.rawData());
+            darkBot = cs->getAlpha(botIt.rawData());
+            if (darkTop != darkBot) {
+                // detected a change
+                m_horSegments.back().append(qMakePair(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(QValueList<PointPair>());
+
+        while (!leftIt.isDone()) {
+            darkLeft = cs->getAlpha(leftIt.rawData());
+            darkRight = cs->getAlpha(rightIt.rawData());
+            if (darkLeft != darkRight) {
+                // detected a change
+                m_vertSegments.back().append(qMakePair(KisPoint(rightIt.x(), rightIt.y()), 1));
+            }
+            ++leftIt;
+            ++rightIt;
+        }
+    }
+}
+