source/graphics/inc/mg_ctxt.h

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/*******************************************************************************
 * Copyright © 2014 The DTVKit Open Software Foundation Ltd (www.dtvkit.org)
 * Copyright © 2009 Ocean Blue Software Ltd
 *
 * This file is part of a DTVKit Software Component
 * You are permitted to copy, modify or distribute this file subject to the terms
 * of the DTVKit 1.0 Licence which can be found in licence.txt or at www.dtvkit.org
 * 
 * THIS CODE AND INFORMATION ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND,
 * EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
 * 
 * If you or your organisation is not a member of DTVKit then you have access
 * to this source code outside of the terms of the licence agreement
 * and you are expected to delete this and any associated files immediately.
 * Further information on DTVKit, membership and terms can be found at www.dtvkit.org
 *******************************************************************************/
#ifndef _MG_CTXT_H
#define _MG_CTXT_H

#include "mheg5_control.h" /* for colour format defs */

#ifdef OSD_8_BIT
 #if defined(OSD_16_BIT) || defined(OSD_31_BIT) || defined(OSD_32_BIT)
  #define MULTIPLE_COLOUR_FORMATS
 #endif
#elif defined(OSD_16_BIT)
 #if defined(OSD_31_BIT) || defined(OSD_32_BIT)
  #define MULTIPLE_COLOUR_FORMATS
 #endif
#elif defined(OSD_31_BIT) && defined(OSD_32_BIT)
  #define MULTIPLE_COLOUR_FORMATS
#endif

#if defined(OSD_31_BIT) /*ST colour*/
 #if defined(OSD_32_BIT)
  #define MAX_ALPHA           mg_ctxt.max_alpha
 #else
  #define MAX_ALPHA           0x80
 #endif
 #define CalcAlpha(a)         (((a) * MAX_ALPHA) / 255)
 #define AlphaCalc(a)         (((a) * 255) / MAX_ALPHA)
 #define ConvertAlpha(oc, nc)  nc = CalcAlpha(oc >> 24); nc <<= 24; nc |= oc & 0x00ffffff;
 #define AlphaPlatform(oc)    (oc == 0) ? 0 : (CalcAlpha(oc >> 24) << 24) | (oc & 0x00ffffff)
 #define AlphaStandard(oc)    (oc == 0) ? 0 : (AlphaCalc(oc >> 24) << 24) | (oc & 0x00ffffff)
#elif defined(OSD_32_BIT)
 #define MAX_ALPHA            0xff
 #define CalcAlpha(a)         a
 #define ConvertAlpha(oc, nc)  nc = oc;
 #define AlphaPlatform(oc)    oc
 #define AlphaStandard(oc)    oc
#endif

#ifdef MULTIPLE_COLOUR_FORMATS
 #define IF_COL_DEPTH(cd)     if (mg_ctxt.colour_format == cd)
 #define ELSE                 else
#else
 #define IF_COL_DEPTH(cd)
 #define ELSE
#endif

#define BytesPerPixel(cf)  ((cf + 7) >> 3)

typedef struct s_ratio
{
   U16BIT mlt;
   U16BIT div;
} S_RATIO;

typedef struct _MGContext
{
   U16BIT out_video_width;        /* video screen width  */
   U16BIT out_video_height;       /* video screen height */
   U16BIT out_osd_width;          /* OSD output screen width  */
   U16BIT out_osd_height;         /* OSD output screen height */
   U16BIT input_width;            /* input width (mheg normally 720 or 360, hbbtv 1280) */
   U16BIT input_height;           /* input height (mheg normally 576 or 288, hbbtv 720) */
   S_RATIO osd_x;
   S_RATIO osd_y;
   S_RATIO vid_x;
   S_RATIO vid_y;
   S_RATIO line_w;
   void *hw_handle;
   void *screen_buff;
   U32BIT screen_stride;
   U8BIT colour_format;           /* Colour depth in bits per pixel - 8,16,31,32 */
#if defined(OSD_31_BIT) && defined(OSD_32_BIT)
   U8BIT max_alpha;
#endif
} S_MGContext;

extern S_MGContext mg_ctxt;

#define HD_W_SCALEUP(w)       (((S32BIT)(w) * mg_ctxt.line_w.mlt) / mg_ctxt.line_w.div)

#define HD_X_SCALEUP(x)       (((S32BIT)(x) * mg_ctxt.osd_x.mlt) / mg_ctxt.osd_x.div)

#define HD_Y_SCALEUP(y)       (((S32BIT)(y) * mg_ctxt.osd_y.mlt) / mg_ctxt.osd_y.div)

#endif /*_MG_CTXT_H*/