Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.

BUG:215923


git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdegraphics@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

1 files changed, 362 insertions, 0 deletions

diff --git a/kolourpaint/pixmapfx/kpfloodfill.cpp b/kolourpaint/pixmapfx/kpfloodfill.cpp
new file mode 100644
index 00000000..602e8acf
--- /dev/null
+++ b/kolourpaint/pixmapfx/kpfloodfill.cpp
@@ -0,0 +1,362 @@
+
+/*
+   Copyright (c) 2003,2004,2005 Clarence Dang <dang@kde.org>
+   All rights reserved.
+
+   Redistribution and use in source and binary forms, with or without
+   modification, are permitted provided that the following conditions
+   are met:
+
+   1. Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+   2. Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+
+   THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+   IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+   OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+   IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+   INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+   NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+   THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+
+#define DEBUG_KP_FLOOD_FILL 0
+
+
+#include <kpfloodfill.h>
+
+#include <qapplication.h>
+#include <qbitmap.h>
+#include <qpainter.h>
+#include <qpixmap.h>
+
+#include <kdebug.h>
+#include <kpdefs.h>
+
+#include <kppixmapfx.h>
+#include <kptool.h>
+
+
+kpFloodFill::kpFloodFill (QPixmap *pixmap, int x, int y,
+                         const kpColor &color, int processedColorSimilarity)
+    : m_pixmapPtr (pixmap), m_x (x), m_y (y),
+      m_color (color), m_processedColorSimilarity (processedColorSimilarity),
+      m_initState (0)
+{
+}
+
+kpFloodFill::~kpFloodFill ()
+{
+}
+
+
+// private
+int kpFloodFill::fillLinesListSize (const QValueList <kpFloodFill::FillLine> &fillLines) const
+{
+    return (fillLines.size () * kpFloodFill::FillLine::size ());
+}
+    
+// public
+int kpFloodFill::size () const
+{
+    int fillLinesCacheSize = 0;
+    for (QValueVector < QValueList <kpFloodFill::FillLine > >::const_iterator it = m_fillLinesCache.begin ();
+         it != m_fillLinesCache.end ();
+         it++)
+    {
+        fillLinesCacheSize += fillLinesListSize (*it);
+    }
+    
+    return fillLinesListSize (m_fillLines) +
+           kpPixmapFX::imageSize (m_image) +
+           fillLinesCacheSize;
+}
+
+
+QRect kpFloodFill::boundingRect () const
+{
+    return m_boundingRect;
+}
+
+bool kpFloodFill::fill ()
+{
+    if (m_initState < 2 && !prepare ())
+    {
+        kdError () << "kpFloodFill:fill() could not prepare()!" << endl;
+        return false;
+    }
+
+    // not trying to do a NOP fill
+    if (m_boundingRect.isValid ())
+    {
+        QApplication::setOverrideCursor (Qt::waitCursor);
+
+        QPainter painter, maskPainter;
+        QBitmap maskBitmap;
+
+        if (m_pixmapPtr->mask () || m_color.isTransparent ())
+        {
+            maskBitmap = kpPixmapFX::getNonNullMask (*m_pixmapPtr);
+            maskPainter.begin (&maskBitmap);
+            maskPainter.setPen (m_color.maskColor ());
+        }
+
+        if (m_color.isOpaque ())
+        {
+            painter.begin (m_pixmapPtr);
+            painter.setPen (m_color.toQColor ());
+        }
+
+        const QValueList <FillLine>::ConstIterator fillLinesEnd = m_fillLines.end ();
+        for (QValueList <FillLine>::ConstIterator it = m_fillLines.begin ();
+             it != fillLinesEnd;
+             it++)
+        {
+            QPoint p1 = QPoint ((*it).m_x1, (*it).m_y);
+            QPoint p2 = QPoint ((*it).m_x2, (*it).m_y);
+
+            if (painter.isActive ())
+                painter.drawLine (p1, p2);
+
+            if (maskPainter.isActive ())
+                maskPainter.drawLine (p1, p2);
+        }
+
+        if (painter.isActive ())
+            painter.end ();
+
+        if (maskPainter.isActive ())
+            maskPainter.end ();
+
+        if (!maskBitmap.isNull ())
+            m_pixmapPtr->setMask (maskBitmap);
+
+        QApplication::restoreOverrideCursor ();
+    }
+    else
+    {
+    #if DEBUG_KP_FLOOD_FILL && 1
+        kdDebug () << "kpFloodFill::fill() performing NOP fill" << endl;
+    #endif
+    }
+
+    return true;
+}
+
+bool kpFloodFill::prepareColorToChange ()
+{
+#if DEBUG_KP_FLOOD_FILL && 1
+    kdDebug () << "kpFloodFill::prepareColorToChange" << endl;
+#endif
+
+    m_colorToChange = kpPixmapFX::getColorAtPixel (*m_pixmapPtr, QPoint (m_x, m_y));
+
+    if (m_colorToChange.isOpaque ())
+    {
+    #if DEBUG_KP_FLOOD_FILL && 1
+        kdDebug () << "\tcolorToChange: r=" << m_colorToChange.red ()
+                   << ", b=" << m_colorToChange.blue ()
+                   << ", g=" << m_colorToChange.green ()
+                   << endl;
+    #endif
+    }
+    else
+    {
+    #if DEBUG_KP_FLOOD_FILL && 1
+        kdDebug () << "\tcolorToChange: transparent" << endl;
+    #endif
+    }
+
+    m_initState = 1;
+    return true;
+}
+
+// Derived from the zSprite2 Graphics Engine
+
+bool kpFloodFill::prepare ()
+{
+#if DEBUG_KP_FLOOD_FILL && 1
+    kdDebug () << "kpFloodFill::prepare()" << endl;
+#endif
+    m_boundingRect = QRect ();
+
+    if (m_initState < 1 && !prepareColorToChange ())
+    {
+        kdError () << "kpFloodFill:prepare() could not prepareColorToChange()!" << endl;
+        return false;
+    }
+
+#if DEBUG_KP_FLOOD_FILL && 1
+    kdDebug () << "\tperforming NOP check" << endl;
+#endif
+
+    // get the color we need to replace
+    if (m_processedColorSimilarity == 0 && m_color == m_colorToChange)
+    {
+        // need to do absolutely nothing (this is a significant optimisation
+        // for people who randomly click a lot over already-filled areas)
+        m_initState = 2;  // sync with all "return true"'s
+        return true;
+    }
+
+#if DEBUG_KP_FLOOD_FILL && 1
+    kdDebug () << "\tconverting to image" << endl;
+#endif
+
+    // is this the only way to read pixels?
+    m_image = kpPixmapFX::convertToImage (*m_pixmapPtr);
+    if (m_image.isNull ())
+    {
+        kdError () << "kpFloodFill::prepare() could not convert to QImage" << endl;
+        return false;
+    }
+
+#if DEBUG_KP_FLOOD_FILL && 1
+    kdDebug () << "\tcreating fillLinesCache" << endl;
+#endif
+
+    // ready cache
+    m_fillLinesCache.resize (m_pixmapPtr->height ());
+
+#if DEBUG_KP_FLOOD_FILL && 1
+    kdDebug () << "\tcreating fill lines" << endl;
+#endif
+
+    // draw initial line
+    addLine (m_y, findMinX (m_y, m_x), findMaxX (m_y, m_x));
+
+    for (QValueList <FillLine>::ConstIterator it = m_fillLines.begin ();
+         it != m_fillLines.end ();
+         it++)
+    {
+    #if DEBUG_KP_FLOOD_FILL && 0
+        kdDebug () << "Expanding from y=" << (*it).m_y
+                   << " x1=" << (*it).m_x1
+                   << " x2=" << (*it).m_x2
+                   << endl;
+    #endif
+
+        // make more lines above and below current line
+        findAndAddLines (*it, -1);
+        findAndAddLines (*it, +1);
+    }
+
+#if DEBUG_KP_FLOOD_FILL && 1
+    kdDebug () << "\tfinalising memory usage" << endl;
+#endif
+
+    // finalize memory usage
+    m_image.reset ();
+    m_fillLinesCache.clear ();
+
+    m_initState = 2;  // sync with all "return true"'s
+    return true;
+}
+
+void kpFloodFill::addLine (int y, int x1, int x2)
+{
+#if DEBUG_KP_FLOOD_FILL && 0
+    kdDebug () << "kpFillCommand::fillAddLine (" << y << "," << x1 << "," << x2 << ")" << endl;
+#endif
+
+    m_fillLines.append (FillLine (y, x1, x2));
+    m_fillLinesCache [y].append (FillLine (y /* OPT */, x1, x2));
+    m_boundingRect = m_boundingRect.unite (QRect (QPoint (x1, y), QPoint (x2, y)));
+}
+
+kpColor kpFloodFill::pixelColor (int x, int y, bool *beenHere) const
+{
+    if (beenHere)
+        *beenHere = false;
+
+    if (y >= (int) m_fillLinesCache.count ())
+    {
+        kdError () << "kpFloodFill::pixelColor("
+                   << x << ","
+                   << y << ") y out of range=" << m_pixmapPtr->height () << endl;
+        return kpColor::invalid;
+    }
+
+    const QValueList <FillLine>::ConstIterator theEnd = m_fillLinesCache [y].end ();
+    for (QValueList <FillLine>::ConstIterator it = m_fillLinesCache [y].begin ();
+         it != theEnd;
+         it++)
+    {
+        if (x >= (*it).m_x1 && x <= (*it).m_x2)
+        {
+            if (beenHere)
+                *beenHere = true;
+            return m_color;
+        }
+    }
+
+    return kpPixmapFX::getColorAtPixel (m_image, QPoint (x, y));
+}
+
+bool kpFloodFill::shouldGoTo (int x, int y) const
+{
+    bool beenThere;
+    const kpColor col = pixelColor (x, y, &beenThere);
+
+    return (!beenThere && col.isSimilarTo (m_colorToChange, m_processedColorSimilarity));
+}
+
+void kpFloodFill::findAndAddLines (const FillLine &fillLine, int dy)
+{
+    // out of bounds?
+    if (fillLine.m_y + dy < 0 || fillLine.m_y + dy >= m_pixmapPtr->height ())
+        return;
+
+    for (int xnow = fillLine.m_x1; xnow <= fillLine.m_x2; xnow++)
+    {
+        // At current position, right colour?
+        if (shouldGoTo (xnow, fillLine.m_y + dy))
+        {
+            // Find minimum and maximum x values
+            int minxnow = findMinX (fillLine.m_y + dy, xnow);
+            int maxxnow = findMaxX (fillLine.m_y + dy, xnow);
+
+            // Draw line
+            addLine (fillLine.m_y + dy, minxnow, maxxnow);
+
+            // Move x pointer
+            xnow = maxxnow;
+        }
+    }
+}
+
+// finds the minimum x value at a certain line to be filled
+int kpFloodFill::findMinX (int y, int x) const
+{
+    for (;;)
+    {
+        if (x < 0)
+            return 0;
+
+        if (shouldGoTo (x, y))
+            x--;
+        else
+            return x + 1;
+    }
+}
+
+// finds the maximum x value at a certain line to be filled
+int kpFloodFill::findMaxX (int y, int x) const
+{
+    for (;;)
+    {
+        if (x > m_pixmapPtr->width () - 1)
+            return m_pixmapPtr->width () - 1;
+
+        if (shouldGoTo (x, y))
+            x++;
+        else
+            return x - 1;
+    }
+}