107 lines
3.1 KiB
107 lines
3.1 KiB
/*
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* Copyright (c) 2004 Boudewijn Rempt <boud@valdyas.org>
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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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#ifndef KIS_ALPHA_MASK_
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#define KIS_ALPHA_MASK_
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#include <tqimage.h>
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#include <tqvaluevector.h>
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#include <ksharedptr.h>
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#include "kis_global.h"
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#include "kis_types.h"
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/**
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* KisAlphaMask is intended to create alpha values from a TQImage for use
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* in brush creation. It is not a generic alpha mask that can be used with
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* KisPaintDevices: use a KisSelection for that.
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*/
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class KisAlphaMask : public KShared {
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public:
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/**
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Create an alpha mask based on the specified TQImage. If the image is
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not a grayscale, the mask value is calculated from the effective grey
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level and alpha value.
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*/
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KisAlphaMask(const TQImage& img);
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/**
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As above except quicker as the image does not need to be scanned
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to see if it has any colour pixels.
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*/
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KisAlphaMask(const TQImage& img, bool hasColor);
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/**
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Create a transparent mask.
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*/
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KisAlphaMask(TQ_INT32 width, TQ_INT32 height);
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virtual ~KisAlphaMask();
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/**
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@return the number of alpha values in a scanline.
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*/
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TQ_INT32 height() const;
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/**
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@return the number of lines in the mask.
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*/
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TQ_INT32 width() const;
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/**
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@return the alpha value at the specified position.
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Returns TQ_UINT8 OPACITY_TRANSPARENT if the value is
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outside the bounds of the mask.
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XXX: this is, of course, not the best way of masking.
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Better would be to let KisAlphaMask fill a chunk of memory
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with the alpha values at the right position, something like
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void applyMask(TQ_UINT8 *pixeldata, TQ_INT32 pixelWidth,
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TQ_INT32 alphaPos). That would be fastest, or we could
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provide an iterator over the mask, that would be nice, too.
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*/
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inline TQ_UINT8 alphaAt(TQ_INT32 x, TQ_INT32 y) const
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{
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if (y >= 0 && y < m_height && x >= 0 && x < m_width) {
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return m_data[(y * m_width) + x];
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}
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else {
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return OPACITY_TRANSPARENT;
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}
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}
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void setAlphaAt(TQ_INT32 x, TQ_INT32 y, TQ_UINT8 alpha);
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// Create a new mask by interpolating between mask1 and mask2 as t
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// goes from 0 to 1.
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static KisAlphaMaskSP interpolate(KisAlphaMaskSP mask1, KisAlphaMaskSP mask2, double t);
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private:
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void computeAlpha(const TQImage& img);
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void copyAlpha(const TQImage& img);
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TQValueVector<TQ_UINT8> m_data;
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TQ_INT32 m_width;
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TQ_INT32 m_height;
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};
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#endif // KIS_ALPHA_MASK_
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