aspect_ratio.c

pmpmodavc102_sub_src,psp下很好的播放器源码

/*
PMP Mod
Copyright (C) 2006 jonny

Homepage: http://jonny.leffe.dnsalias.com
E-mail:   [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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

/*
aspect ratio calculations
*/


#include "aspect_ratio.h"


struct aspect_ratio_struct aspect_ratios[number_of_aspect_ratios] =
	{
	{"Original",   0,   0, 0, 0},
	{"4 / 3",      4,   3, 0, 0},
	{"16 / 9",   480, 272, 0, 0},
	{"2.35",     235, 100, 0, 0}
	};


void aspect_ratio_struct_init(unsigned int width, unsigned int height)
	{
	aspect_ratios[0].width  = width;
	aspect_ratios[0].height = height;


	int i = 0;
	for (; i < number_of_aspect_ratios; i++)
		{
		// width / height > 480 / 272

		if (272 * aspect_ratios[i].width > 480 * aspect_ratios[i].height)
			{
			// height / width = psp_height / psp_width

			aspect_ratios[i].psp_width  = 480;
			aspect_ratios[i].psp_height = aspect_ratios[i].psp_width * aspect_ratios[i].height / aspect_ratios[i].width;
			}
		else
			{
			// width / height = psp_width / psp_height

			aspect_ratios[i].psp_height = 272;
			aspect_ratios[i].psp_width  = aspect_ratios[i].psp_height * aspect_ratios[i].width / aspect_ratios[i].height;
			}
		}
	}