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