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/**
* $Id$
* ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
*
* 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. The Blender
* Foundation also sells licenses for use in proprietary software under
* the Blender License. See http://www.blender.org/BL/ for information
* about this.
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
* All rights reserved.
*
* The Original Code is: all of this file.
*
* Contributor(s): none yet.
*
* ***** END GPL/BL DUAL LICENSE BLOCK *****
*/
#include "IMG_BrushRGBA32.h"
#include <math.h>
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
IMG_BrushRGBA32::IMG_BrushRGBA32(TUns32 w, TUns32 h, const IMG_ColorRGB& c, float a)
: IMG_PixmapRGBA32(w, h), m_color(c), m_alpha(a)
{
m_ro = w < h ? w/2 : h/2;
m_ri = m_ro >> 1;
updateImage();
}
void IMG_BrushRGBA32::setColor(const IMG_ColorRGB& c)
{
m_color = c;
updateImage();
}
void IMG_BrushRGBA32::setTransparency(float a)
{
m_alpha = a;
if (m_alpha > 1.f) m_alpha = 1.f;
if (m_alpha < 0.f) m_alpha = 0.f;
updateImage();
}
void IMG_BrushRGBA32::setRadii(TUns32 rI, TUns32 rO)
{
m_ri = rI;
m_ro = rO;
TUns32 w_2 = m_width >> 1;
TUns32 h_2 = m_height >> 1;
/*
* Make the brush size smaller than half of the minimum
* width or height of the pixmap. Make sure that inner
* radius <= outer radius.
*/
if (m_ro > w_2) m_ro = w_2;
if (m_ro > h_2) m_ro = h_2;
if (m_ri > m_ro) m_ri = m_ro;
updateImage();
}
void IMG_BrushRGBA32::updateImage()
{
float fcx = m_width / 2.0f;
float fcy = m_height/ 2.0f ;
// Prepare pixel values for this pixmap
IMG_ColorRGBA c (m_color.m_r, m_color.m_g, m_color.m_b, 0.f);
TPixelRGBA32 pOut = getPixelValue(c);
c.m_a = m_alpha;
TPixelRGBA32 pIn = getPixelValue(c);
TPixelRGBA32 p = getPixelValue(c);
TUns8* pa = & (((TUns8*)&p)[bi_a]);
// Set the pixels in the destination rectangle
for (TUns32 y = 0; y < m_height; y++) {
// Park pixel pointer at the start pixels
TPixelPtr desPtr = getPixelPtr(0, y);
for (TUns32 x = 0; x < m_width; x++) {
// Calculate the distance between current pixel and center
float dX = (float)((TInt32)x - fcx);
float dY = (float)((TInt32)y - fcy);
float d = (float) ::sqrt(dX*dX + dY*dY);
float a;
if (d <= m_ri) {
*desPtr = pIn;
}
else {
if ((d < m_ro) && (m_ri < m_ro)) {
// Calculate alpha, linear
a = (d - m_ri) / (m_ro - m_ri);
// Now: 0 <= a <= 1
a = (float)::pow(a, 0.5f);
a = (1.f - a) * m_alpha;
// Now: m_alpha <= a <= 1
// Store pixel
*pa = (TUns8)(a * ((float)0xFF));
*desPtr = p;
}
else {
*desPtr = pOut;
}
}
desPtr++;
}
}
}
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