// Copyright (c) 2009-2010, Niels Martin Hansen
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// Aegisub Project http://www.aegisub.org/
//
// $Id$

/// @file audio_colorscheme.cpp
/// @ingroup audio_ui
///
/// Manage colour schemes for the audio display

#include "config.h"

#ifndef AGI_PRE
#include <algorithm>
#endif

#include "audio_colorscheme.h"

#include "audio_renderer.h"
#include "colorspace.h"

#include <libaegisub/exception.h>

static int lum_icy_normal(float t)
{
	return std::min(255, (int)(128 * 2 * t));
}

static int lum_icy_selected(float t)
{
	return std::min(255, (int)(128 * (3 * t/2 + 0.5f)));
}

static int lum_icy_inactive(float t)
{
	return 32 + (int)(192 * t);
}

void AudioColorScheme::InitIcyBlue(int audio_rendering_style)
{
	int (*lum_func)(float);
	switch (static_cast<AudioRenderingStyle>(audio_rendering_style))
	{
		case AudioStyle_Normal:   lum_func = lum_icy_normal; break;
		case AudioStyle_Inactive: lum_func = lum_icy_inactive; break;
		case AudioStyle_Active:   lum_func = lum_icy_normal; break;
		case AudioStyle_Selected: lum_func = lum_icy_selected; break;
		default: throw agi::InternalError("Unknown audio rendering styling", 0);
	}

	unsigned char *palptr = palette;
	for (size_t i = 0; i <= factor; ++i)
	{
		float t = (float)i / factor;
		int H = (int)(255 * (1.5 - t) / 2);
		int S = (int)(255 * (0.5 + t/2));
		int L = lum_func(t);
		hsl_to_rgb(H, S, L, palptr + 0, palptr + 1, palptr + 2);
		palptr += 4;
	}
}