unit uLandUtils;

interface

procedure ResizeLand(width, height: LongWord);

procedure InitWorldEdges();

implementation

uses uUtils, uConsts, uVariables, uTypes;

procedure ResizeLand(width, height: LongWord);

var potW, potH: LongInt;

begin

potW:= toPowerOf2(width);

potH:= toPowerOf2(height);

if (potW <> LAND_WIDTH) or (potH <> LAND_HEIGHT) then

    begin

    LAND_WIDTH:= potW;

    LAND_HEIGHT:= potH;

    LAND_WIDTH_MASK:= not(LAND_WIDTH-1);

    LAND_HEIGHT_MASK:= not(LAND_HEIGHT-1);

    cWaterLine:= LAND_HEIGHT;

    if (cReducedQuality and rqBlurryLand) = 0 then

        SetLength(LandPixels, LAND_HEIGHT, LAND_WIDTH)

    else

        SetLength(LandPixels, LAND_HEIGHT div 2, LAND_WIDTH div 2);

    SetLength(Land, LAND_HEIGHT, LAND_WIDTH);

    SetLength(LandDirty, (LAND_HEIGHT div 32), (LAND_WIDTH div 32));

    // 0.5 is already approaching on unplayable

    if (width div 4096 >= 2) or (height div 2048 >= 2) then cMaxZoomLevel:= 0.5;

    cMinMaxZoomLevelDelta:= cMaxZoomLevel - cMinZoomLevel

    end;

end;

procedure InitWorldEdges();

var cy, cx, lx, ly: LongInt;

    found: boolean;

begin

playHeight:= LAND_HEIGHT;

topY:= 0;

lx:= LongInt(LAND_WIDTH) - 1;

if WorldEdge = weNone then

    begin

    playWidth:= LAND_WIDTH;

    leftX := 0;

    rightX:= lx;

    EXIT;

    end;

ly:= LongInt(LAND_HEIGHT) - 1;

// find most left land pixels and set leftX accordingly

found:= false;

for cx:= 0 to lx do

    begin

    for cy:= ly downto 0 do

        if Land[cy, cx] <> 0 then

            begin

            leftX:= max(0, cx - cWorldEdgeDist);

            // break out of both loops

            found:= true;

            break;

            end;

    if found then break;

    end;

// find most right land pixels and set rightX accordingly

found:= false;

for cx:= lx downto 0 do

    begin

    for cy:= ly downto 0 do

        if Land[cy, cx] <> 0 then

            begin

            rightX:= min(lx, cx + cWorldEdgeDist);

            // break out of both loops

            found:= true;

            break;

            end;

    if found then break;

    end;

playWidth := rightX + 1 - leftX;

end;

end.