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-rw-r--r--chalk/plugins/paintops/defaultpaintops/kis_eraseop.cc140
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diff --git a/chalk/plugins/paintops/defaultpaintops/kis_eraseop.cc b/chalk/plugins/paintops/defaultpaintops/kis_eraseop.cc
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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);
+ Q_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 tqmask = brush->tqmask(info, xFraction, yFraction);
+
+ KisPaintDeviceSP dab = new KisPaintDevice(device->colorSpace(), "erase op dab");
+ Q_CHECK_PTR(dab);
+
+ TQ_INT32 tqmaskWidth = tqmask->width();
+ TQ_INT32 tqmaskHeight = tqmask->height();
+
+ TQRect dstRect;
+
+ KisRectIteratorPixel it = dab->createRectIterator(0, 0, tqmaskWidth, tqmaskHeight, true);
+ KisColorSpace* cs = dab->colorSpace();
+ while (!it.isDone()) {
+ cs->setAlpha(it.rawData(), TQ_UINT8_MAX - tqmask->alphaAt(it.x(), it.y()), 1);
+ ++it;
+ }
+
+ TQRect dabRect = TQRect(0, 0, tqmaskWidth, tqmaskHeight);
+ 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);
+}
+