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141 lines
4.6 KiB
141 lines
4.6 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 <qrect.h>
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#include <kdebug.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_layer.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_iterators_pixel.h"
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#include "kis_colorspace.h"
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#include "kis_selection.h"
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#include "kis_eraseop.h"
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KisPaintOp * KisEraseOpFactory::createOp(const KisPaintOpSettings */*settings*/, KisPainter * painter)
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{
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KisPaintOp * op = new KisEraseOp(painter);
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Q_CHECK_PTR(op);
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return op;
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}
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KisEraseOp::KisEraseOp(KisPainter * painter)
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: super(painter)
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{
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}
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KisEraseOp::~KisEraseOp()
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{
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}
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void KisEraseOp::paintAt(const KisPoint &pos, const KisPaintInformation& info)
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{
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// Erasing is traditionally in paint applications one of two things:
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// either it is painting in the 'background' color, or it is replacing
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// all pixels with transparent (black?) pixels.
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//
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// That's what this paint op does for now; however, anyone who has
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// ever worked with paper and soft pencils knows that a sharp piece of
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// eraser rubber is a pretty useful too for making sharp to fuzzy lines
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// in the graphite layer, or equally useful: for smudging skin tones.
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//
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// A smudge tool for Krita is in the making, but when working with
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// a tablet, the eraser tip should be at least as functional as a rubber eraser.
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// That means that only after repeated or forceful application should all the
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// 'paint' or 'graphite' be removed from the surface -- a kind of pressure
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// sensitive, incremental smudge.
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//
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// And there should be an option to not have the eraser work on certain
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// kinds of material. Layers are just a hack for this; putting your ink work
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// in one layer and your pencil in another is not the same as really working
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// with the combination.
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if (!m_painter) return;
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KisPaintDeviceSP device = m_painter->device();
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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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KisPoint hotSpot = brush->hotSpot(info);
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KisPoint pt = pos - hotSpot;
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Q_INT32 destX;
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double xFraction;
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Q_INT32 destY;
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double yFraction;
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splitCoordinate(pt.x(), &destX, &xFraction);
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splitCoordinate(pt.y(), &destY, &yFraction);
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KisAlphaMaskSP mask = brush->mask(info, xFraction, yFraction);
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KisPaintDeviceSP dab = new KisPaintDevice(device->colorSpace(), "erase op dab");
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Q_CHECK_PTR(dab);
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Q_INT32 maskWidth = mask->width();
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Q_INT32 maskHeight = mask->height();
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QRect dstRect;
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KisRectIteratorPixel it = dab->createRectIterator(0, 0, maskWidth, maskHeight, true);
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KisColorSpace* cs = dab->colorSpace();
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while (!it.isDone()) {
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cs->setAlpha(it.rawData(), Q_UINT8_MAX - mask->alphaAt(it.x(), it.y()), 1);
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++it;
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}
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QRect dabRect = QRect(0, 0, maskWidth, maskHeight);
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dstRect = QRect(destX, destY, 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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Q_INT32 sx = dstRect.x() - destX;
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Q_INT32 sy = dstRect.y() - destY;
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Q_INT32 sw = dstRect.width();
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Q_INT32 sh = dstRect.height();
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if (m_source->hasSelection()) {
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m_painter->bltSelection(dstRect.x(), dstRect.y(), COMPOSITE_ERASE, 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(), COMPOSITE_ERASE, 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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