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/*****************************************************************************
* DrawingTidbits.cpp
*****************************************************************************
* Copyright (C) 2001 VideoLAN
* $Id: DrawingTidbits.cpp,v 1.2 2001/03/21 13:42:33 sam Exp $
*
* Authors: Tony Castley <tcastley@mail.powerup.com.au>
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
*****************************************************************************/
#include <Bitmap.h>
#include <Debug.h>
#include <Screen.h>
#include "DrawingTidbits.h"
inline uchar
ShiftComponent(uchar component, float percent)
{
// change the color by <percent>, make sure we aren't rounding
// off significant bits
if (percent >= 1)
return (uchar)(component * (2 - percent));
else
return (uchar)(255 - percent * (255 - component));
}
rgb_color
ShiftColor(rgb_color color, float percent)
{
rgb_color result = {
ShiftComponent(color.red, percent),
ShiftComponent(color.green, percent),
ShiftComponent(color.blue, percent),
0
};
return result;
}
static bool
CompareColors(const rgb_color a, const rgb_color b)
{
return a.red == b.red
&& a.green == b.green
&& a.blue == b.blue
&& a.alpha == b.alpha;
}
bool
operator==(const rgb_color &a, const rgb_color &b)
{
return CompareColors(a, b);
}
bool
operator!=(const rgb_color &a, const rgb_color &b)
{
return !CompareColors(a, b);
}
void
ReplaceColor(BBitmap *bitmap, rgb_color from, rgb_color to)
{
ASSERT(bitmap->ColorSpace() == B_COLOR_8_BIT); // other color spaces not implemented yet
BScreen screen(B_MAIN_SCREEN_ID);
uint32 fromIndex = screen.IndexForColor(from);
uint32 toIndex = screen.IndexForColor(to);
uchar *bits = (uchar *)bitmap->Bits();
int32 bitsLength = bitmap->BitsLength();
for (int32 index = 0; index < bitsLength; index++)
if (bits[index] == fromIndex)
bits[index] = toIndex;
}
void
ReplaceTransparentColor(BBitmap *bitmap, rgb_color with)
{
ASSERT(bitmap->ColorSpace() == B_COLOR_8_BIT); // other color spaces not implemented yet
BScreen screen(B_MAIN_SCREEN_ID);
uint32 withIndex = screen.IndexForColor(with);
uchar *bits = (uchar *)bitmap->Bits();
int32 bitsLength = bitmap->BitsLength();
for (int32 index = 0; index < bitsLength; index++)
if (bits[index] == B_TRANSPARENT_8_BIT)
bits[index] = withIndex;
}
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