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151 lines
5.1 KiB
151 lines
5.1 KiB
/*
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* Copyright (c) 2002 Patrick Julien <freak@codepimps.org>
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* Copyright (c) 2004 Boudewijn Rempt <boud@valdyas.org>
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* Copyright (c) 2004 Clarence Dang <dang@kde.org>
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* Copyright (c) 2004 Adrian Page <adrian@pagenet.plus.com>
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* Copyright (c) 2004 Cyrille Berger <cberger@cberger.net>
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*
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* This program 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; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <tqrect.h>
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#include <kdebug.h>
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#include "kis_vec.h"
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#include "kis_brush.h"
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#include "kis_global.h"
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#include "kis_paint_device.h"
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#include "kis_painter.h"
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#include "kis_types.h"
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#include "kis_paintop.h"
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#include "kis_layer.h"
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#include "kis_selection.h"
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#include "kis_airbrushop.h"
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KisPaintOp * KisAirbrushOpFactory::createOp(const KisPaintOpSettings */*settings*/, KisPainter * painter)
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{
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KisPaintOp * op = new KisAirbrushOp(painter);
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TQ_CHECK_PTR(op);
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return op;
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}
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KisAirbrushOp::KisAirbrushOp(KisPainter * painter)
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: super(painter)
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{
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}
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KisAirbrushOp::~KisAirbrushOp()
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{
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}
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void KisAirbrushOp::paintAt(const KisPoint &pos, const KisPaintInformation& info)
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{
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// See: http://www.sysf.physto.se/~klere/airbrush/ for information
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// about _real_ airbrushes.
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//
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// Most graphics apps -- especially the simple ones like Kolourpaint
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// and the previous version of this routine in Chalk took a brush
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// shape -- often a simple ellipse -- and filled that shape with a
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// random 'spray' of single pixels.
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//
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// Other, more advanced graphics apps, like the Gimp or Photoshop,
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// take the brush shape and paint just as with the brush paint op,
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// only making the initial dab more transparent, and perhaps adding
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// extra transparence near the edges. Then, using a timer, when the
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// cursor stays in place, dab upon dab is positioned in the same
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// place, which makes the result less and less transparent.
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//
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// What I want to do here is create an airbrush that approaches a real
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// one. It won't use brush shapes, instead going for the old-fashioned
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// circle. Depending upon pressure, both the size of the dab and the
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// rate of paint deposition is determined. The edges of the dab are
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// more transparent than the center, with perhaps even some fully
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// transparent pixels between the near-transparent pixels.
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//
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// By pressing some to-be-determined key at the same time as pressing
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// mouse-down, one edge of the dab is made straight, to simulate
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// working with a shield.
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//
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// Tilt may be used to make the gradients more realistic, but I don't
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// have a tablet that supports tilt.
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//
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// Anyway, it's exactly twenty years ago that I have held a real
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// airbrush, for the first and up to now the last time...
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//
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if (!m_painter) return;
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KisPaintDeviceSP device = m_painter->device();
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// For now: use the current brush shape -- it beats calculating
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// ellipes and cones, and it shows the working of the timer.
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if (!device) return;
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KisBrush * brush = m_painter->brush();
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if (! brush->canPaintFor(info) )
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return;
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KisPaintDeviceSP dab = m_painter->dab();
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KisPoint hotSpot = brush->hotSpot(info);
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KisPoint pt = pos - hotSpot;
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TQ_INT32 x;
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double xFraction;
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TQ_INT32 y;
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double yFraction;
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splitCoordinate(pt.x(), &x, &xFraction);
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splitCoordinate(pt.y(), &y, &yFraction);
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if (brush->brushType() == IMAGE || brush->brushType() == PIPE_IMAGE) {
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dab = brush->image(device->colorSpace(), info, xFraction, yFraction);
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}
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else {
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KisAlphaMaskSP mask = brush->mask(info, xFraction, yFraction);
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dab = computeDab(mask);
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}
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m_painter->setDab(dab); // Cache dab for future paints in the painter.
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m_painter->setPressure(info.pressure); // Cache pressure in the current painter.
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TQRect dabRect = TQRect(0, 0, brush->maskWidth(info), brush->maskHeight(info));
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TQRect dstRect = TQRect(x, y, dabRect.width(), dabRect.height());
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KisImage * image = device->image();
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if (image != 0) {
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dstRect &= image->bounds();
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}
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if (dstRect.isNull() || dstRect.isEmpty() || !dstRect.isValid()) return;
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TQ_INT32 sx = dstRect.x() - x;
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TQ_INT32 sy = dstRect.y() - y;
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TQ_INT32 sw = dstRect.width();
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TQ_INT32 sh = dstRect.height();
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if (m_source->hasSelection()) {
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m_painter->bltSelection(dstRect.x(), dstRect.y(), m_painter->compositeOp(), dab.data(),
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m_source->selection(), m_painter->opacity(), sx, sy, sw, sh);
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}
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else {
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m_painter->bitBlt(dstRect.x(), dstRect.y(), m_painter->compositeOp(), dab.data(), m_painter->opacity(), sx, sy, sw, sh);
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}
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m_painter->addDirtyRect(dstRect);
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}
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