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/*
* Copyright (c) 2002 Patrick Julien <freak@codepimps.org>
* Copyright (c) 2004 Boudewijn Rempt <boud@valdyas.org>
* Copyright (c) 2004 Clarence Dang <dang@kde.org>
* Copyright (c) 2004 Adrian Page <adrian@pagenet.plus.com>
* Copyright (c) 2004 Cyrille Berger <cberger@cberger.net>
*
* 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_brush.h"
#include "kis_global.h"
#include "kis_paint_device.h"
#include "kis_layer.h"
#include "kis_painter.h"
#include "kis_types.h"
#include "kis_paintop.h"
#include "kis_iterators_pixel.h"
#include "kis_colorspace.h"
#include "kis_selection.h"
#include "kis_eraseop.h"
KisPaintOp * KisEraseOpFactory::createOp(const KisPaintOpSettings */*settings*/, KisPainter * painter)
{
KisPaintOp * op = new KisEraseOp(painter);
TQ_CHECK_PTR(op);
return op;
}
KisEraseOp::KisEraseOp(KisPainter * painter)
: super(painter)
{
}
KisEraseOp::~KisEraseOp()
{
}
void KisEraseOp::paintAt(const KisPoint &pos, const KisPaintInformation& info)
{
// Erasing is traditionally in paint applications one of two things:
// either it is painting in the 'background' color, or it is replacing
// all pixels with transparent (black?) pixels.
//
// That's what this paint op does for now; however, anyone who has
// ever worked with paper and soft pencils knows that a sharp piece of
// eraser rubber is a pretty useful too for making sharp to fuzzy lines
// in the graphite layer, or equally useful: for smudging skin tones.
//
// A smudge tool for Chalk is in the making, but when working with
// a tablet, the eraser tip should be at least as functional as a rubber eraser.
// That means that only after repeated or forceful application should all the
// 'paint' or 'graphite' be removed from the surface -- a kind of pressure
// sensitive, incremental smudge.
//
// And there should be an option to not have the eraser work on certain
// kinds of material. Layers are just a hack for this; putting your ink work
// in one layer and your pencil in another is not the same as really working
// with the combination.
if (!m_painter) return;
KisPaintDeviceSP device = m_painter->device();
if (!device) return;
KisBrush *brush = m_painter->brush();
if (! brush->canPaintFor(info) )
return;
KisPoint hotSpot = brush->hotSpot(info);
KisPoint pt = pos - hotSpot;
TQ_INT32 destX;
double xFraction;
TQ_INT32 destY;
double yFraction;
splitCoordinate(pt.x(), &destX, &xFraction);
splitCoordinate(pt.y(), &destY, &yFraction);
KisAlphaMaskSP mask = brush->mask(info, xFraction, yFraction);
KisPaintDeviceSP dab = new KisPaintDevice(device->colorSpace(), "erase op dab");
TQ_CHECK_PTR(dab);
TQ_INT32 maskWidth = mask->width();
TQ_INT32 maskHeight = mask->height();
TQRect dstRect;
KisRectIteratorPixel it = dab->createRectIterator(0, 0, maskWidth, maskHeight, true);
KisColorSpace* cs = dab->colorSpace();
while (!it.isDone()) {
cs->setAlpha(it.rawData(), TQ_UINT8_MAX - mask->alphaAt(it.x(), it.y()), 1);
++it;
}
TQRect dabRect = TQRect(0, 0, maskWidth, maskHeight);
dstRect = TQRect(destX, destY, 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() - destX;
TQ_INT32 sy = dstRect.y() - destY;
TQ_INT32 sw = dstRect.width();
TQ_INT32 sh = dstRect.height();
if (m_source->hasSelection()) {
m_painter->bltSelection(dstRect.x(), dstRect.y(), COMPOSITE_ERASE, dab.data(),
m_source->selection(), m_painter->opacity(), sx, sy, sw, sh);
}
else {
m_painter->bitBlt(dstRect.x(), dstRect.y(), COMPOSITE_ERASE, dab.data(), m_painter->opacity(), sx, sy, sw, sh);
}
m_painter->addDirtyRect(dstRect);
}
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