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

/// @file audio_renderer_waveform.h
/// @see audio_renderer_waveform.cpp
/// @ingroup audio_ui
///
/// Render a waveform display of PCM audio data

#include <stdint.h>



class AudioWaveformRenderer : public AudioRendererBitmapProvider {
	/// Colour table used for regular rendering
	AudioColorScheme colors_normal;

	/// Colour table used for rendering the audio selection
	AudioColorScheme colors_selected;

	/// Pre-allocated buffer for audio fetched from provider
	char *audio_buffer;

protected:
	virtual void OnSetProvider();
	virtual void OnSetSamplesPerPixel();

public:
	/// @brief Constructor
	AudioWaveformRenderer();

	/// @brief Destructor
	virtual ~AudioWaveformRenderer();

	/// @brief Render a range of audio waveform
	/// @param bmp      [in,out] Bitmap to render into, also carries lenght information
	/// @param start    First column of pixel data in display to render
	/// @param selected Whether to use the alternate colour scheme
	void Render(wxBitmap &bmp, int start, bool selected);

	/// @brief Render blank area
	void RenderBlank(wxDC &dc, const wxRect &rect, bool selected);

	/// @brief Cleans up the cache
	/// @param max_size Maximum size in bytes for the cache
	///
	/// Does nothing for waveform renderer, since it does not have a backend cache
	void AgeCache(size_t max_size) { }
};