rockbox/apps/plugins/vu_meter.c

/***************************************************************************

 *             __________               __   ___.

 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___

 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /

 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <

 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \

 *                     \/            \/     \/    \/            \/

 *

 * Copyright (C) 2003 Lee Pilgrim

 *

 * All files in this archive are subject to the GNU General Public License.

 * See the file COPYING in the source tree root for full license agreement.

 *

 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY

 * KIND, either express or implied.

 *

 **************************************************************************/

#ifndef SIMULATOR      /* The simulator dosen't have a MAS */

#include "plugin.h"



#ifdef HAVE_LCD_BITMAP



static struct plugin_api* rb;



enum plugin_status plugin_start(struct plugin_api* api, void* parameter)

{

    TEST_PLUGIN_API(api);

    (void) parameter;

    rb = api;



    /*

       I hope to make (left/right)_needle_top_y change some day (because it looks

       like it is stretching) so that is why it is a int and not a #define.

    */

    #define LEFT_NEEDLE_BOTTOM_X 28

    #define LEFT_NEEDLE_BOTTOM_Y 53

    int left_needle_top_x;

    int left_needle_top_y = 18;



    #define RIGHT_NEEDLE_BOTTOM_X 84

    #define RIGHT_NEEDLE_BOTTOM_Y 53

    int right_needle_top_x;

    int right_needle_top_y = 18;



    while (!PLUGIN_OK)

    {

        /* These are to define how far the tip of the needles can go to the

           left and right. The names are a bit confusing. The LEFT/RIGHT tells

           which needle it is for, and the L/R at the end tells which side

           of the needle. */

        #define MAX_LEFT_L 2

        #define MAX_LEFT_R 55

        #define MAX_RIGHT_L 57

        #define MAX_RIGHT_R 111



        #define MAX_PEAK 0x7FFF



        left_needle_top_x =

            (rb->mas_codec_readreg(0xC) *

             (MAX_LEFT_R - MAX_LEFT_L) / MAX_PEAK) + MAX_LEFT_L;

        

        right_needle_top_x =

            (rb->mas_codec_readreg(0xD) *

             (MAX_RIGHT_R - MAX_RIGHT_L) / MAX_PEAK) + MAX_RIGHT_L;



        /* Time to draw all of the display stuff!

           Could I move some of these out of the loop so they don't have to

           be re-drawn everytime, but still be displayed, or would that

           improve performance any at all? */

        rb->lcd_clear_display();



        rb->lcd_drawline(LEFT_NEEDLE_BOTTOM_X, LEFT_NEEDLE_BOTTOM_Y,

                         left_needle_top_x, left_needle_top_y);

        rb->lcd_drawline(RIGHT_NEEDLE_BOTTOM_X, RIGHT_NEEDLE_BOTTOM_Y,

                         right_needle_top_x, right_needle_top_y);



        rb->lcd_setfont(FONT_SYSFIXED);

        rb->lcd_putsxy(30, 1, "VU Meter");



        /* The first is the line under "VU Meter" and the second is under

           the needles. */

        rb->lcd_drawline(30, 9, 77, 9);

        rb->lcd_drawline(0, 53, 111, 53);



        /* These are the needle "covers" - we're going for that

           "old fashioned" look */



        /* The left needle cover - organized from the top line to the bottom */

        rb->lcd_drawline(27, 48, 29, 48);

        rb->lcd_drawline(25, 49, 31, 49);

        rb->lcd_drawline(23, 50, 33, 50);

        rb->lcd_drawline(22, 51, 34, 51);

        rb->lcd_drawline(22, 52, 34, 52);



        /* The right needle cover - organized from the top line to

           the bottom */

        rb->lcd_drawline(83, 48, 85, 48);

        rb->lcd_drawline(81, 49, 87, 49);

        rb->lcd_drawline(79, 50, 89, 50);

        rb->lcd_drawline(78, 51, 90, 51);

        rb->lcd_drawline(78, 52, 90, 52);



        rb->lcd_update();



        /* We must yield once in a while to make sure that the MPEG thread

           isn't starved, but we use the shortest possible timeout for best

           performance */

        switch (rb->button_get_w_tmo(1))

        {

            case BUTTON_OFF:

                return PLUGIN_OK;

        }

    }

}

#endif /* HAVE_LCD_BITMAP */

#endif /* #ifndef SIMULATOR */