BT412/game/reconstructed/btl4gau3.cpp

//===========================================================================//
// File:	btl4gau3.cpp                                                        //
// Project: BattleTech          Brick: Gauge Renderer Manager                 //
// Contents: Cockpit instrument library, part 3 -- multiplayer / tactical HUD  //
//           displays (see btl4gau3.hpp).                                      //
//---------------------------------------------------------------------------//
//   Date    Who  Modification                                               //
// --------  ---  ---------------------------------------------------------- //
// 02/22/96  CPB  Initial coding.                                            //
//---------------------------------------------------------------------------//
// Copyright (C) 1996, Virtual World Entertainment, Inc. All rights reserved //
//                      PROPRIETARY AND CONFIDENTIAL                         //
//===========================================================================//
//
// RECONSTRUCTED from the shipped binary (BTL4OPT.EXE).  Behaviour follows the
// Ghidra pseudo-C in recovered/all/part_014.c (@004c9bd0..@004cbea0).  Class /
// member names from the CODE identification strings; per-method @ADDR cited.
// This TU links between btl4gau2.obj and btl4grnd.obj.
//
// Engine-internal helper map (consistent with btl4gau2.cpp):
//      FUN_00444818 GraphicGauge ctor   FUN_00444870 GraphicGauge dtor
//      FUN_004700bc NumericDisplay ctor  FUN_0047018c ::dtor
//      FUN_00470430 ::DrawAt  FUN_00470758 ::Erase  FUN_004703f4 ::Reset
//      FUN_00442aec/00442c12 BitMapCache  AddRef/Release
//      FUN_00442d2b/00442e51 PixMapCache  AddRef/Release
//      FUN_004700ac InternName     FUN_004022e8 FreeName
//      FUN_00403ad0 NamedNode::Find(dictionary, name)   ("Players")
//      FUN_00421414 ChainOf<Player*>::Iterator ctor   FUN_00421452 ::dtor
//      FUN_0042076c Subsystem::FindDamageZone -> index
//      FUN_004c3b98 ColorMapperArmor ctor (btl4gaug)
//      FUN_004c2f88 -> 7 (selection/blip colour)   FUN_004c2f94 entity colour
//      FUN_0044fc10 score/rank lookup   FUN_004b0898 lance-slot mech lookup
//      FUN_0049fb54 / 0x50bdb4 damage-mapping-group derivation
//      FUN_00449c88 Pixmap ctor    FUN_00449d0c Pixmap dtor
//      FUN_00407064 Warehouse::FindResource (App+0x68)   FUN_004032dc MemoryStream
//      FUN_004dcd94 Round   FUN_004dbb24 DebugStream<<char*  FUN_004db78c <<int
//      DAT_004efc94 the Application (App+0x24 dictionary, +0x68 warehouse,
//                   +0xc8 palette cache, +0x6c local mech)
//
// Recovered string evidence:
//      "SectorDisplay: Missing image " 0x51bc90   "Players" 0x51bcba/0x51bd97
//      "PlayerStatus: Make player number " 0x51bcd9
//      "CreateMutantPixelmap8: couldn't ..." 0x51bd0d/0x51bd40/0x51bd6d
//      "PilotList" 0x51bb4a   "PlayerStatus" 0x51bb54   "MessageBoard" 0x51bb61
//      "adpal.pcc" 0x51bd9f  "adpal2.pcc" 0x51bda9  "PlayerStatusMappingGroup" 0x51bdb4
//

// See btl4gaug.cpp: suppress heat.hpp's optional DebugStream so the shared
// mechrecon ReconStream definition is the only one active in this TU.
#define BT_DEBUGSTREAM_DEFINED

#include <bt.hpp>
#pragma hdrstop

#if !defined(BTL4GAU3_HPP)
#	include <btl4gau3.hpp>
#endif
#if !defined(APP_HPP)
#	include <app.hpp>
#endif

//
// Unrecovered .data resource pools used by the two Make() factories below.  The
// concrete bytes (rate/mode/colours/image names) were not recovered from the
// optimised image; declared here as typed placeholders so the construction
// paths compile.  (BEST-EFFORT.)  DebugStream is provided by the shared recon
// headers.
//
static int  DAT_0051a2bc = 0;					// SectorDisplay GaugeRate
static int  DAT_0051a300 = 0;					// SectorDisplay ModeMask
static char DAT_0051a344[] = "";				// SectorDisplay grid image name
// (PlayerStatus's DAT_ placeholder pool removed -- its rewired Make reads
//  methodDescription.parameterList[] like the other registered widgets.)


//###########################################################################
//   PlayerStatusMappingGroup        @004c9bd0
//###########################################################################
//
// @004c9bd0 -- build the 28 ColorMapperArmor zone gauges.  For each name in the
// damage-zone name table (PTR_s_dz_door_0051a240, 28 entries) build a transient
// damage-zone descriptor, resolve its index on the mech (FindDamageZone
// @0042076c), allocate (0x70) a ColorMapperArmor and construct it (@004c3b98)
// wired to that zone (incrementing the next base colour index each iteration).
// @004c9ca8 -- destroy: delete all 28, optionally free the array.
// @004c9cf4 -- Execute: run each element's Execute (vtbl+0xc).
// @004c9d18 -- SetColor: recolour all 28 (FUN_004c3c38 = ColorMapper SetColor).
//


//###########################################################################
//   SectorDisplay                   @004c9d44 Make / @004c9e10 ctor
//###########################################################################

//
// @004c9d44 -- Make.  Allocate (0xc4) and construct "SectorDisplay" from the
// resource strings (DAT_0051a2bc..0051a3cc).  Then verify the grid image exists
// (BitMapCache); if missing, warn "SectorDisplay: Missing image <name>".
//
Logical
	SectorDisplay::Make(
		int				/*display_port_index*/,
		Vector2DOf<int>	/*position*/,
		Entity			*entity,
		GaugeRenderer	*gauge_renderer
	)
{
	SectorDisplay *gauge = (SectorDisplay *)operator new(0xc4);
	if (gauge != NULL)
	{
		//
		// Construct with the recovered grid-image name; the remaining geometry /
		// colour / font-image arguments were not recovered, so are typed
		// placeholders.
		//
		new (gauge) SectorDisplay(
			(GaugeRate)DAT_0051a2bc,			// rate
			(ModeMask)DAT_0051a300,				// mode mask
			(L4GaugeRenderer *)gauge_renderer,
			0,									// graphics port number
			0, 0,								// x, y
			(char *)&DAT_0051a344,				// grid image
			(char *)0,							// font image
			0,									// color
			"SectorDisplay");
	}

	BitMap *grid = gauge_renderer->warehousePointer->bitMapBin.GetIfAlreadyExists(
		(char *)&DAT_0051a344);					// FUN_00442aec (peek, no AddRef)
	if (grid == NULL)
	{
		DebugStream << "SectorDisplay: Missing image "
					<< (char *)&DAT_0051a344 << "\n";	// FUN_004dbb24 x3
	}
	return (grid != NULL);
}

//
// @004c9e10 -- ctor (vtable PTR_FUN_0051beec).  GraphicGauge base, interns the
// grid image; computes cellWidth = imageWidth/14, gridLeft = cellWidth*12,
// gridRight = cellWidth*12 + cellWidth - 1, gridHeight = imageHeight; sets the
// port origin; builds two NumericDisplays (this[0x2F] at origin, this[0x30] at
// +cellWidth*4).  baseLine = dirty = 500.
// @004c9f94 -- dtor: release grid, delete both numerics, GraphicGauge::~GraphicGauge.
// @004ca038 -- BecameActive: dirty=1; reset both numerics.
// @004ca068 -- SetEnable: this[0x24] = enable.
// @004ca07c -- Execute: when enabled, DrawAt the two numerics at the rounded
// cursor position (+offsets), and on the first pass blit the grid image.
//


//###########################################################################
//   TeamStatusDisplay               @004ca208
//###########################################################################
//
// @004ca208 -- ctor (vtable PTR_FUN_0051bea8).  GraphicGauge base.  rowSpacing =
// param_10; originY = param_8 - 0x20; flags = param_12.  Reads the font bitmap
// width to size the highlight (cellW = w/14; highlightWidth = cellW*8 + 0x86,
// plus an extra column when flags&4).  Builds 8 rows, each with a number
// NumericDisplay (this[0x3B+i]) and -- when flags&4 -- a kill NumericDisplay
// (this[0x4C+i]); rows step down by rowSpacing.
// @004ca39c -- dtor: delete the 8 numeric pairs, base dtor.
// @004ca424 -- SetEnable: this[0x24] = enable.
// @004ca438 -- BecameActive: selectedRow = 999; per-row prev = -1, prevScore =
//   -0.001f (0xba83126f); per-row prevRank = -1.
// @004ca478 -- Execute.  Resolve the local player's index/team
// (App+0x6c mech -> +0x190 -> +0x1cc index, +0x204 team via FUN_0044fc10).
// Read the "Players" node (FindByName @00403ad0), slot each player into [0..7]
// by entity+0x1cc (skipping spectators, +0x29 bit 0x40).  For each row: if the
// occupant changed, blit the player's interned name bitmap (App+0xc8 palette
// cache lookup) or clear, tinting friendly/self with FUN_004c2f88 (=7).  Then
// update each kill numeric from entity+0x1c8.  When flags&4, also track each
// player's rank (entity+0x204 - rankBase via FUN_0044fc10).  Finally redraw the
// selection underline on the local player's row.
//


//###########################################################################
//   PilotList                       @004ca90c Make / @004ca958 ctor
//###########################################################################
//
// @004ca90c -- Make: allocate (0x178) and construct "PilotList" from
// DAT_0051ab4c..0051abd4.
// @004ca958 -- ctor (vtable PTR_FUN_0051be64).  GraphicGauge base.  For each of
// 8 entries, read its (x,y,layoutMode) from DAT_0051af88 (stride 3); compute the
// three NumericDisplay positions from layoutMode (0/1/2) and build them
// (this entry +0x10/+0x14/+0x18).  resolvedMech = 0; selected = 0.
// @004cab10 -- dtor: delete the 3 numerics per entry (8 entries), base dtor.
// @004caba4 -- BecameActive: per-entry resolvedMech (+0x08) = -1; currentSlot = 9.
// @004cabd0 -- Execute (one slot per frame).  Look up the lance roster
// (App+0x6c mech +0x128 -> FUN_004b0898 slot lookup).  For the current slot:
// if empty, erase the three numerics; else compute the player-name bitmap and
// blit it (DrawMechIcon @004cad70 tints by team via FUN_004c2f88), then DrawAt
// the mech (+0x27c) and score (+0x280) numerics.  Advance currentSlot (wraps 8).
// helpers DrawMechIcon @004cad70, DrawAmmoCount @004cae20.
//


//###########################################################################
//   PlayerStatus                    @004cae90 Make / @004cb1a8 ctor
//###########################################################################

//
// @004cae90 -- Make.  DAT_0051b07c is the player number; must be 1..8 or
// "PlayerStatus: Make player number <n>" is warned.  Allocates (200) and
// constructs "PlayerStatus" from DAT_0051aff4..0051b1d0.
//
MethodDescription
	PlayerStatus::methodDescription =
	{
		"PlayerStatus",
		PlayerStatus::Make,
		{
			// CFG (L4GAUGE.CFG:29): PlayerStatus(D,ModeAlwaysActive,1,helv15.pcc,0,11,3,1)
			{ ParameterDescription::typeRate,     NULL },	// p[0] rate
			{ ParameterDescription::typeModeMask, NULL },	// p[1] mode mask
			{ ParameterDescription::typeInteger,  NULL },	// p[2] player number 1..8
			{ ParameterDescription::typeString,   NULL },	// p[3] font image
			{ ParameterDescription::typeColor,    NULL },	// p[4] color
			{ ParameterDescription::typeColor,    NULL },	// p[5] okColor
			{ ParameterDescription::typeColor,    NULL },	// p[6] aliveColor
			{ ParameterDescription::typeColor,    NULL },	// p[7] deadColor
			PARAMETER_DESCRIPTION_END
		}
	};

//
// @004cae90 -- Make.  Rewired to read methodDescription.parameterList[] (the
// binary read raw DAT_ pools) + the port/x/y bug fixed (it passed entity/renderer
// as x/y and dropped the port).  Returns True even on a NULL alloc (binary-faithful).
//
Logical
	PlayerStatus::Make(
		int				display_port_index,
		Vector2DOf<int>	position,
		Entity			* /*entity -- unused by PlayerStatus*/,
		GaugeRenderer	*gauge_renderer
	)
{
	ParameterDescription *p = methodDescription.parameterList;
	int playerNumber = p[2].data.integer;
	if (playerNumber < 1 || playerNumber > 8)
	{
		DebugStream << "PlayerStatus: Make player number "
					<< playerNumber << " out of range\n";
		return False;
	}

	PlayerStatus *gauge = (PlayerStatus *)operator new(200);
	if (gauge != NULL)
	{
		new (gauge) PlayerStatus(
			p[0].data.rate, p[1].data.modeMask,
			(L4GaugeRenderer *)gauge_renderer,
			display_port_index,				// graphics_port_number  <-- FIX (was dropped)
			position.x, position.y,			// x, y                  <-- FIX (was (int)entity/(int)renderer)
			playerNumber, p[3].data.string,
			p[4].data.color, p[5].data.color, p[6].data.color, p[7].data.color,
			"PlayerStatus");
	}
	return True;
}

//###########################################################################
//   file-private helpers
//###########################################################################

// (ReadStreamString @004caf50 -- the length-prefixed string reader used by the
// faithful CreateMutantPixelmap8 -- deferred with the pixmap-recolor stub above;
// its stream read is a vtbl+0x1c indirect whose method name needs mapping.)

//
// @004cafac -- per-player pixmap recolour.  Find the mech's type-0x20 pixmap
// resource (App resource file), open it as a MemoryStream, read the embedded
// image name, look the source pixmap up in the renderer's PixMap8 cache, and copy
// it while biasing every palette index >= 0x20 by (paletteBase-0x20) so each
// player's mech outline draws in its own colour ramp.  Returns the (reused) Pixmap.
//
static Pixmap *
	CreateMutantPixelmap8(Entity * /*mech*/, L4Warehouse * /*warehouse*/,
	                      int /*paletteBase*/, Pixmap *dest)
{
	// ⚠ BRING-UP STUB (marked; leaves the mech-outline schematic unrendered).
	// The faithful reconstruction (decomp @004cafac) resolves the mech's type-0x20
	// pixmap sub-resource from the App ResourceFile, opens it as a memory stream,
	// reads the embedded image name (the stream read is a vtbl+0x1c indirect --
	// ReadStreamString @004caf50), looks the source PixMap8 up in the renderer
	// warehouse, and copies it biasing every palette index >= 0x20 by
	// (paletteBase-0x20) so each player's mech draws in its own colour ramp.
	// Deferred: the DynamicMemoryStream read API + Pixmap pixel-copy need mapping.
	// With this stub recoloredMech stays NULL -> Execute skips the outline blit;
	// the score, name box, and alive/dead status box still render.
	return dest;
}

//###########################################################################
//   PlayerStatusMappingGroup   @004c9bd0
//###########################################################################

//
// The 28 named damage zones (PTR_s_dz_door_0051a240); each gets one
// ColorMapperArmor tinting that zone of the mech-outline schematic.
//
static const char *const kPlayerStatusZone[playerStatusZoneCount] =
{
	"dz_door","dz_dtorso","dz_hip","dz_larm","dz_ldleg","dz_lfoot","dz_lgun",
	"dz_ltorso","dz_luleg","dz_missle","dz_rarm","dz_rdleg","dz_rfoot","dz_rgun",
	"dz_rtorso","dz_ruleg","dz_searchlight","dz_utorso","dz_reardtorso",
	"dz_rearltorso","dz_rearrtorso","dz_rearutorso","dz_lmissle","dz_rmissle",
	"unused1","unused2","unused3","unused4"
};

PlayerStatusMappingGroup::PlayerStatusMappingGroup(
	GaugeRate rate, ModeMask mode_mask, L4GaugeRenderer *renderer,
	int graphics_port_number, Entity *mech, int base_color_index,
	const char *palette_a, const char *palette_b, const char * /*identification_string*/)
{
	for (int i = 0; i < playerStatusZoneCount; ++i)
	{
		int zoneIndex = (mech != NULL)
			? mech->GetDamageZoneIndex(CString(kPlayerStatusZone[i]))	// FUN_0042076c (-1 => inert)
			: -1;
		zone[i] = (ColorMapperArmor *)operator new(0x70);
		if (zone[i] != NULL)
			new (zone[i]) ColorMapperArmor(					// EXISTING 10-arg ctor (btl4gaug)
				rate, mode_mask, renderer, graphics_port_number,
				base_color_index + i, mech, palette_a, palette_b,
				zoneIndex, "ColorMapperArmor");
	}
}

PlayerStatusMappingGroup::~PlayerStatusMappingGroup()
{
	for (int i = 0; i < playerStatusZoneCount; ++i)
	{
		delete zone[i];
		zone[i] = NULL;
	}
}

void
	PlayerStatusMappingGroup::Execute()					// @004c9cf4  run all 28
{
	for (int i = 0; i < playerStatusZoneCount; ++i)
		if (zone[i] != NULL) zone[i]->Execute();
}

void
	PlayerStatusMappingGroup::SetColor(int state)		// @004c9d18  push state onto all 28
{
	for (int i = 0; i < playerStatusZoneCount; ++i)
		if (zone[i] != NULL) zone[i]->SetColor(state);
}

//###########################################################################
//   PlayerStatus   @004cb1a8 ctor / @004cb28c dtor / @004cb310 BecameActive /
//                  @004cb358 Execute
//###########################################################################

//
// @004cb1a8 -- ctor (vtable PTR_FUN_0051be20).  GraphicGauge base (owner folded
// to 0); stash the four state colours + port; set the port origin; build the
// score NumericDisplay.
//
PlayerStatus::PlayerStatus(
	GaugeRate rate, ModeMask mode_mask, L4GaugeRenderer *renderer_in,
	int graphics_port_number, int x, int y, int player_number,
	const char *font_image, int color_in, int ok_color,
	int alive_color, int dead_color, const char *identification_string)
  : GraphicGauge(rate, mode_mask, renderer_in, 0,			// FUN_00444818 (owner 0)
				 graphics_port_number, identification_string)
{
	color = color_in; okColor = ok_color; aliveColor = alive_color; deadColor = dead_color;
	port  = graphics_port_number;
	localView.SetOrigin(x, y);								// this+0x48 vtbl+0x10
	playerIndex   = player_number - 1;
	player = NULL; nameImage = NULL; recoloredMech = NULL; mappingGroup = NULL;
	L4Warehouse *warehouse = (L4Warehouse *)renderer_in->warehousePointer;
	scoreDisplay = new NumericDisplay(						// FUN_004700bc  @0xB8
		warehouse, 0x72, 0xD8, font_image, 5,
		(NumericDisplay::NumericFormat)2 /*signedBlankedZeros*/, color, okColor);
	// dirty/previousStatus/previousMappingState set by BecameActive (byte-faithful).
}

//
// @004cb28c -- dtor.  Free the score numeric + the recoloured mech pixmap; the
// base chain runs implicitly.  (nameImage is cache-owned; mappingGroup deleted
// here as a correctness fix over the binary's leak.)
//
PlayerStatus::~PlayerStatus()
{
	player = NULL;
	delete scoreDisplay;  scoreDisplay = NULL;				// FUN_0047018c
	if (recoloredMech) { delete recoloredMech; recoloredMech = NULL; }	// FUN_00449d0c
	if (mappingGroup)  { delete mappingGroup;  mappingGroup  = NULL; }	// (binary leaks this)
}

Logical
	PlayerStatus::TestInstance() const						// @004cb2f8
{
	return GraphicGauge::TestInstance();
}

//
// @004cb310 -- BecameActive: reset the score readout, run the mapping group once,
// and force a full redraw next Execute.
//
void
	PlayerStatus::BecameActive()
{
	scoreDisplay->ForceUpdate();									// FUN_004703f4
	if (mappingGroup != NULL) mappingGroup->Execute();		// FUN_004c9cf4
	dirty                =  1;
	previousStatus       = -1;
	previousMappingState = -1;
}

//
// @004cb358 -- Execute.  Resolve player N (the mission player for the local
// player; WinTesla-clean via GetMissionPlayer instead of the binary's raw
// App+0x24 "Players"-node dictionary walk); on a change rebuild the recoloured
// mech pixmap + the 28-zone mapping group; each frame draw the score + mech
// outline + name box + alive/dead status box.  Runs under the gauge's guarded
// Execute (BT_DEV_GAUGES), so a bad player-field offset degrades to a disabled
// gauge, never a game crash.
//
void
	PlayerStatus::Execute()
{
	// --- PART 1: resolve / change-detect the player ---
	Entity *resolved = NULL;
	if (playerIndex == 0 && application != NULL)
		resolved = (Entity *)application->GetMissionPlayer();	// the local player (player 1)

	if (getenv("BT_PS_LOG"))
	{
		static int s_c = 0;
		if ((s_c++ % 60) == 0)
			DEBUG_STREAM << "[ps] idx=" << playerIndex << " resolved=" << (void*)resolved
				<< " player=" << (void*)player << " port=" << port << "\n" << std::flush;
	}

	if (resolved != player)
	{
		player = resolved;
		if (player != NULL)
		{
			Entity *mech = *(Entity **)((char *)player + 0x1FC);	// player's vehicle
			if (mech == NULL)
			{
				player = NULL;								// no vehicle yet -> retry next frame
			}
			else
			{
				L4Warehouse *wh = (L4Warehouse *)renderer->warehousePointer;
				int base = playerIndex * 0x1C + 0x10;
				recoloredMech = CreateMutantPixelmap8(mech, wh, base, recoloredMech);
				if (mappingGroup) delete mappingGroup;
				mappingGroup = new PlayerStatusMappingGroup(
					rate, modeMask, (L4GaugeRenderer *)renderer, port, mech, base,
					"adpal.pcc", "adpal2.pcc", "PlayerStatusMappingGroup");
				nameImage = NULL;							// BRING-UP: App+0xC8 name cache not wired -> clear-box branch
				BecameActive();								// force a full redraw
			}
		}
	}

	// --- PART 2: per-frame draw (only with a bound player) ---
	if (player == NULL)
		return;
	Entity *mech = *(Entity **)((char *)player + 0x1FC);
	if (mech == NULL)
		return;

	// (a) score readout
	scoreDisplay->Draw(&localView, *(Scalar *)((char *)player + 0x1C8));	// FUN_00470430

	// (b) mapping-group disabled-state refresh
	int disabled = 0;									// BRING-UP: Mech::IsDisabled needs a Mech* cast (mech.hpp collides in this TU)
	if (disabled != previousMappingState)
	{
		previousMappingState = disabled;
		if (mappingGroup) mappingGroup->SetColor(disabled);	// FUN_004c9d18
	}

	// (c) mech outline + name box, dirty-gated
	if (dirty)
	{
		dirty = 0;
		if (recoloredMech != NULL)
		{
			localView.MoveToAbsolute(1, 1);					// vtbl+0x24
			localView.DrawPixelMap8(True, 0, recoloredMech, 0, 0,	// vtbl+0x5C
				recoloredMech->Data.Size.x - 1, recoloredMech->Data.Size.y - 1);
		}
		localView.MoveToAbsolute(1, 0xCF);
		if (nameImage == NULL)								// no name bitmap -> filled box in `color`
		{
			localView.SetColor(color);						// vtbl+0x18
			localView.DrawFilledRectangleToRelative(0x80, 0x20);	// vtbl+0x4C
		}
		else
		{
			localView.SetColor(0xFF);
			localView.DrawBitMapOpaque(color, 0, nameImage, 0, 0,	// vtbl+0x58
				nameImage->Data.Size.x - 1, nameImage->Data.Size.y - 1);
		}
	}

	// (d) alive/dead status box, state-change gated
	int state = *(int *)((char *)player + 0x1C4);
	if (state != previousStatus)
	{
		previousStatus = state;
		localView.SetColor(state == 0 ? aliveColor : deadColor);
		localView.MoveToAbsolute(0, 0);
		localView.DrawFilledRectangleToAbsolute(0x9F, 0xEF);	// vtbl+0x44
	}
}

//
// @004cb1a8 -- ctor (vtable PTR_FUN_0051be20).  GraphicGauge base; stashes the
// four state colours (this[0x29..0x2C]); playerIndex = player_number - 1; sets
// the port origin; builds the score NumericDisplay (this[0x2E], helv font,
// color/okColor).
// @004cb28c -- dtor: delete the score numeric; free the mutant pixmap
// (FUN_00449d0c); base dtor.
// @004cb310 -- BecameActive: reset score numeric; run mappingGroup BecameActive
// (FUN_004c9cf4); dirty flags = 1 / -1.
// @004cb358 -- Execute.  Find player N in the "Players" node (@00403ad0,
// "Players" 0x51bd97, indexed lookup vtbl+0x34).  When the player changes and
// has a mech (+0x1fc): build a recoloured name pixmap (CreateMutantPixelmap8
// @004cafac) and a fresh PlayerStatusMappingGroup (@004c9bd0, adpal.pcc/
// adpal2.pcc) tinting the mech outline; cache the interned name bitmap.  Each
// frame: DrawAt the score (+0x1c8); update the armour mapping group when the
// damage-mapping derivation (FUN_0049fb54 / 0x50bdb4) changes; on dirty, blit
// the name bitmap then the recoloured mech outline; finally pick the frame
// colour (aliveColor/deadColor by subsys+0x1c4) and draw the status box.
//


//###########################################################################
//   CreateMutantPixelmap8           @004cafac
//###########################################################################
//
// @004cafac -- per-player pixmap recolour.  Find the source pixmap resource
// (Warehouse @00407064 by id mech+0x1bc); on failure warn "CreateMutantPixelmap8:
// couldn't find ...".  Open it as a MemoryStream, read the embedded image name
// (ReadStreamString @004caf50, 0x50 chars), look it up in the PixMapCache.  Copy
// the source 8-bit pixels into a (possibly reused) Pixmap, biasing every palette
// index >= 0x20 by (palette_base - 0x20) so each player's mech draws in their
// own colour ramp.  Returns the recoloured Pixmap.
//


//###########################################################################
//   MessageBoard                    @004cb678 Make / @004cb704 ctor
//###########################################################################
//
// @004cb678 -- Make: allocate (0xa4) and construct "MessageBoard" from
// DAT_0051b43c..0051b508; verify the strip image exists (BitMapCache).
// @004cb704 -- ctor (vtable PTR_FUN_0051bddc).  GraphicGauge base; interns +
// AddRefs the message strip bitmap (this[0x25]); sets the port origin; color =
// param_10 (this[0x26]).
// @004cb788 -- dtor: release the strip, free the name, base dtor.
// @004cb7fc -- BecameActive: previousNameId = -1; previousMessageId = -2.
// @004cb82c -- Execute.  Track the local player's mech (this[0x24]).  Read its
// controller message ids (mech+0x190 controller, +0xc message id, +0x10 name
// id).  When the message id changes, blit the corresponding 0x80x0x20 cell of
// the strip ((id&3)<<7, (id>>2)<<5) tinted by FUN_004c2f88 (=7); -1 clears.
// When the name id changes, blit the player's name bitmap (App+0xc8 palette
// cache lookup) similarly.
//

// === btl4grnd.cpp begins at @004cbea0 (BTL4GaugeRenderer ctor) -- not this TU.