1 files changed, 150 insertions, 0 deletions
diff --git a/chalk/plugins/paintops/defaultpaintops/kis_airbrushop.cpp b/chalk/plugins/paintops/defaultpaintops/kis_airbrushop.cpp
new file mode 100644
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+++ b/chalk/plugins/paintops/defaultpaintops/kis_airbrushop.cpp
@@ -0,0 +1,150 @@
+/*
+ *  Copyright (c) 2002 Patrick Julien <[email protected]>
+ *  Copyright (c) 2004 Boudewijn Rempt <[email protected]>
+ *  Copyright (c) 2004 Clarence Dang <[email protected]>
+ *  Copyright (c) 2004 Adrian Page <[email protected]>
+ *  Copyright (c) 2004 Cyrille Berger <[email protected]>
+ *
+ *  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 <tqrect.h>
+
+#include <kdebug.h>
+
+#include "kis_vec.h"
+#include "kis_brush.h"
+#include "kis_global.h"
+#include "kis_paint_device.h"
+#include "kis_painter.h"
+#include "kis_types.h"
+#include "kis_paintop.h"
+#include "kis_layer.h"
+#include "kis_selection.h"
+#include "kis_airbrushop.h"
+
+KisPaintOp * KisAirbrushOpFactory::createOp(const KisPaintOpSettings */*settings*/, KisPainter * painter)
+{ 
+    KisPaintOp * op = new KisAirbrushOp(painter); 
+    TQ_CHECK_PTR(op);
+    return op; 
+}
+
+
+KisAirbrushOp::KisAirbrushOp(KisPainter * painter)
+    : super(painter) 
+{
+}
+
+KisAirbrushOp::~KisAirbrushOp() 
+{
+}
+
+void KisAirbrushOp::paintAt(const KisPoint &pos, const KisPaintInformation& info)
+{
+// See: http://www.sysf.physto.se/~klere/airbrush/ for information
+// about _real_ airbrushes.
+//
+// Most graphics apps -- especially the simple ones like Kolourpaint
+// and the previous version of this routine in Chalk took a brush
+// shape -- often a simple ellipse -- and filled that shape with a
+// random 'spray' of single pixels.
+//
+// Other, more advanced graphics apps, like the Gimp or Photoshop,
+// take the brush shape and paint just as with the brush paint op,
+// only making the initial dab more transparent, and perhaps adding
+// extra transparence near the edges. Then, using a timer, when the
+// cursor stays in place, dab upon dab is positioned in the same
+// place, which makes the result less and less transparent.
+//
+// What I want to do here is create an airbrush that approaches a real
+// one. It won't use brush shapes, instead going for the old-fashioned
+// circle. Depending upon pressure, both the size of the dab and the
+// rate of paint deposition is determined. The edges of the dab are
+// more transparent than the center, with perhaps even some fully
+// transparent pixels between the near-transparent pixels.
+//
+// By pressing some to-be-determined key at the same time as pressing
+// mouse-down, one edge of the dab is made straight, to simulate
+// working with a shield.
+//
+// Tilt may be used to make the gradients more realistic, but I don't
+// have a tablet that supports tilt.
+//
+// Anyway, it's exactly twenty years ago that I have held a real
+// airbrush, for the first and up to now the last time...
+//
+
+    if (!m_painter) return;
+
+    KisPaintDeviceSP device = m_painter->device();
+
+    // For now: use the current brush shape -- it beats calculating
+    // ellipes and cones, and it shows the working of the timer.
+    if (!device) return;
+
+    KisBrush * brush = m_painter->brush();
+    if (! brush->canPaintFor(info) )
+        return;
+    KisPaintDeviceSP dab = m_painter->dab();
+
+    KisPoint hotSpot = brush->hotSpot(info);
+    KisPoint pt = pos - hotSpot;
+
+    TQ_INT32 x;
+    double xFraction;
+    TQ_INT32 y;
+    double yFraction;
+
+    splitCoordinate(pt.x(), &x, &xFraction);
+    splitCoordinate(pt.y(), &y, &yFraction);
+
+    if (brush->brushType() == IMAGE || brush->brushType() == PIPE_IMAGE) {
+        dab = brush->image(device->colorSpace(), info, xFraction, yFraction);
+    }
+    else {
+        KisAlphaMaskSP mask = brush->mask(info, xFraction, yFraction);
+        dab = computeDab(mask);
+    }
+
+    m_painter->setDab(dab); // Cache dab for future paints in the painter.
+    m_painter->setPressure(info.pressure); // Cache pressure in the current painter.
+
+    TQRect dabRect = TQRect(0, 0, brush->maskWidth(info), brush->maskHeight(info));
+    TQRect dstRect = TQRect(x, y, dabRect.width(), dabRect.height());
+
+    KisImage * image = device->image();
+
+    if (image != 0) {
+        dstRect &= image->bounds();
+    }
+
+    if (dstRect.isNull() || dstRect.isEmpty() || !dstRect.isValid()) return;
+
+    TQ_INT32 sx = dstRect.x() - x;
+    TQ_INT32 sy = dstRect.y() - y;
+    TQ_INT32 sw = dstRect.width();
+    TQ_INT32 sh = dstRect.height();
+
+    if (m_source->hasSelection()) {
+        m_painter->bltSelection(dstRect.x(), dstRect.y(), m_painter->compositeOp(), dab.data(),
+                                m_source->selection(), m_painter->opacity(), sx, sy, sw, sh);
+    }
+    else {
+        m_painter->bitBlt(dstRect.x(), dstRect.y(), m_painter->compositeOp(), dab.data(), m_painter->opacity(), sx, sy, sw, sh);
+    }
+
+    m_painter->addDirtyRect(dstRect);
+}