/*
 * Copyright 2005, Jérôme Duval. All rights reserved.
 * Distributed under the terms of the MIT License.
 *
 * Inspired by SoundCapture from Be newsletter (Media Kit Basics: Consumers 
 * and Producers)
 */

#include <Bitmap.h>
#include <Debug.h>
#include <Screen.h>

#include "DrawingTidbits.h"

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_CMAP8);
        // 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_CMAP8);
        // other color spaces not implemented yet
        
        BScreen screen(B_MAIN_SCREEN_ID);
        uint8 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;
}