You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
107 lines
3.1 KiB
107 lines
3.1 KiB
/*
|
|
* Copyright (c) 2004 Boudewijn Rempt <boud@valdyas.org>
|
|
*
|
|
* 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.
|
|
*/
|
|
#ifndef KIS_ALPHA_MASK_
|
|
#define KIS_ALPHA_MASK_
|
|
|
|
#include <tqimage.h>
|
|
#include <tqvaluevector.h>
|
|
|
|
#include <ksharedptr.h>
|
|
|
|
#include "kis_global.h"
|
|
#include "kis_types.h"
|
|
|
|
/**
|
|
* KisAlphaMask is intended to create alpha values from a TQImage for use
|
|
* in brush creation. It is not a generic alpha mask that can be used with
|
|
* KisPaintDevices: use a KisSelection for that.
|
|
*/
|
|
class KisAlphaMask : public TDEShared {
|
|
|
|
public:
|
|
/**
|
|
Create an alpha mask based on the specified TQImage. If the image is
|
|
not a grayscale, the mask value is calculated from the effective grey
|
|
level and alpha value.
|
|
*/
|
|
KisAlphaMask(const TQImage& img);
|
|
|
|
/**
|
|
As above except quicker as the image does not need to be scanned
|
|
to see if it has any colour pixels.
|
|
*/
|
|
KisAlphaMask(const TQImage& img, bool hasColor);
|
|
|
|
/**
|
|
Create a transparent mask.
|
|
*/
|
|
KisAlphaMask(TQ_INT32 width, TQ_INT32 height);
|
|
|
|
virtual ~KisAlphaMask();
|
|
|
|
/**
|
|
@return the number of alpha values in a scanline.
|
|
*/
|
|
TQ_INT32 height() const;
|
|
|
|
/**
|
|
@return the number of lines in the mask.
|
|
*/
|
|
TQ_INT32 width() const;
|
|
|
|
/**
|
|
@return the alpha value at the specified position.
|
|
|
|
Returns TQ_UINT8 OPACITY_TRANSPARENT if the value is
|
|
outside the bounds of the mask.
|
|
|
|
XXX: this is, of course, not the best way of masking.
|
|
Better would be to let KisAlphaMask fill a chunk of memory
|
|
with the alpha values at the right position, something like
|
|
void applyMask(TQ_UINT8 *pixeldata, TQ_INT32 pixelWidth,
|
|
TQ_INT32 alphaPos). That would be fastest, or we could
|
|
provide an iterator over the mask, that would be nice, too.
|
|
*/
|
|
inline TQ_UINT8 alphaAt(TQ_INT32 x, TQ_INT32 y) const
|
|
{
|
|
if (y >= 0 && y < m_height && x >= 0 && x < m_width) {
|
|
return m_data[(y * m_width) + x];
|
|
}
|
|
else {
|
|
return OPACITY_TRANSPARENT;
|
|
}
|
|
}
|
|
|
|
void setAlphaAt(TQ_INT32 x, TQ_INT32 y, TQ_UINT8 alpha);
|
|
|
|
// Create a new mask by interpolating between mask1 and mask2 as t
|
|
// goes from 0 to 1.
|
|
static KisAlphaMaskSP interpolate(KisAlphaMaskSP mask1, KisAlphaMaskSP mask2, double t);
|
|
|
|
private:
|
|
void computeAlpha(const TQImage& img);
|
|
void copyAlpha(const TQImage& img);
|
|
|
|
TQValueVector<TQ_UINT8> m_data;
|
|
TQ_INT32 m_width;
|
|
TQ_INT32 m_height;
|
|
};
|
|
|
|
#endif // KIS_ALPHA_MASK_
|
|
|