drawingtidbits.h

video linux conference

/*****************************************************************************
 * DrawingTidbits.h
 *****************************************************************************
 * Copyright (C) 2001 VideoLAN
 * $Id: DrawingTidbits.h 10101 2005-03-02 16:47:31Z robux4 $
 *
 * Authors: Tony Castley <[e-mail]>
 *          Stephan Aßmus <[e-mail]>
 *
 * 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.
 *****************************************************************************/

#ifndef __DRAWING_TIBITS__
#define __DRAWING_TIBITS__

#include <GraphicsDefs.h>

rgb_color ShiftColor(rgb_color , float );

bool operator==(const rgb_color &, const rgb_color &);
bool operator!=(const rgb_color &, const rgb_color &);

inline rgb_color
Color(int32 r, int32 g, int32 b, int32 alpha = 255)
{
	rgb_color result;
	result.red = r;
	result.green = g;
	result.blue = b;
	result.alpha = alpha;

	return result;
}

const rgb_color kWhite = { 255, 255, 255, 255};
const rgb_color kBlack = { 0, 0, 0, 255};

const float kDarkness = 1.06;
const float kDimLevel = 0.6;

void ReplaceColor(BBitmap *bitmap, rgb_color from, rgb_color to);
void ReplaceTransparentColor(BBitmap *bitmap, rgb_color with);

// function can be used to scale the upper left part of
// a bitmap to fill the entire bitmap, ie fromWidth
// and fromHeight must be smaller or equal to the bitmaps size!
// only supported colorspaces are B_RGB32 and B_RGBA32
status_t scale_bitmap( BBitmap* bitmap,
					   uint32 fromWidth, uint32 fromHeight );

// bitmaps need to be the same size, or this function will fail
// currently supported conversions:
//   B_YCbCr422	-> B_RGB32
//   B_RGB32	-> B_RGB32
//   B_RGB16	-> B_RGB32
// not yet implemented conversions:
//   B_YCbCr420	-> B_RGB32
//   B_YUV422	-> B_RGB32
status_t convert_bitmap(BBitmap* inBitmap, BBitmap* outBitmap);

// dims bitmap (in place) by finding the distance of
// the color at each pixel to the provided "center" color
// and shortens that distance by dimLevel
//   (dimLevel < 1 -> less contrast)
//   (dimLevel > 1 -> more contrast)
//   (dimLevel < 0 -> inverted colors)
// currently supported colorspaces:
//   B_RGB32
//   B_RGBA32
//   B_CMAP8
status_t dim_bitmap(BBitmap* bitmap, rgb_color center,
					float dimLevel);

rgb_color dimmed_color_cmap8(rgb_color color, rgb_color center,
							 float dimLevel);

#endif	// __DRAWING_TIBITS__