+
−(*
+
− * Hedgewars, a free turn based strategy game
+
− * Copyright (c) 2004-2012 Andrey Korotaev <unC0Rr@gmail.com>
+
− *
+
− * 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; version 2 of the License
+
− *
+
− * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+
− *)
+
−
+
−{$INCLUDE "options.inc"}
+
−
+
−unit uLandGraphics;
+
−interface
+
−uses uFloat, uConsts, uTypes;
+
−
+
−type TRangeArray = array[0..31] of record
+
−                                   Left, Right: LongInt;
+
−                                   end;
+
−     PRangeArray = ^TRangeArray;
+
−
+
−function  addBgColor(OldColor, NewColor: LongWord): LongWord;
+
−function  SweepDirty: boolean;
+
−function  Despeckle(X, Y: LongInt): Boolean;
+
−procedure Smooth(X, Y: LongInt);
+
−function  CheckLandValue(X, Y: LongInt; LandFlag: Word): boolean;
+
−function  DrawExplosion(X, Y, Radius: LongInt): Longword;
+
−procedure DrawHLinesExplosions(ar: PRangeArray; Radius: LongInt; y, dY: LongInt; Count: Byte);
+
−procedure DrawTunnel(X, Y, dX, dY: hwFloat; ticks, HalfWidth: LongInt);
+
−procedure FillRoundInLand(X, Y, Radius: LongInt; Value: Longword);
+
−procedure ChangeRoundInLand(X, Y, Radius: LongInt; doSet, isCurrent: boolean);
+
−function  LandBackPixel(x, y: LongInt): LongWord;
+
−procedure DrawLine(X1, Y1, X2, Y2: LongInt; Color: Longword);
+
−procedure DrawThickLine(X1, Y1, X2, Y2, radius: LongInt; color: Longword);
+
−procedure DumpLandToLog(x, y, r: LongInt);
+
−
+
−function TryPlaceOnLand(cpX, cpY: LongInt; Obj: TSprite; Frame: LongInt; doPlace: boolean; indestructible: boolean): boolean;
+
−
+
−implementation
+
−uses SDLh, uLandTexture, uVariables, uUtils, uDebug;
+
−
+
−function addBgColor(OldColor, NewColor: LongWord): LongWord;
+
−// Factor ranges from 0 to 100% NewColor
+
−var
+
−    oRed, oBlue, oGreen, oAlpha, nRed, nBlue, nGreen, nAlpha: byte;
+
−begin
+
−    oAlpha := (OldColor shr AShift);
+
−    nAlpha := (NewColor shr AShift);
+
−    // shortcircuit
+
−    if (oAlpha = 0) or (nAlpha = $FF) then
+
−        begin
+
−        addBgColor:= NewColor;
+
−        exit
+
−        end;
+
−    // Get colors
+
−    oRed   := (OldColor shr RShift);
+
−    oGreen := (OldColor shr GShift);
+
−    oBlue  := (OldColor shr BShift);
+
−
+
−    nRed   := (NewColor shr RShift);
+
−    nGreen := (NewColor shr GShift);
+
−    nBlue  := (NewColor shr BShift);
+
−
+
−    // Mix colors
+
−    nRed   := min(255,((nRed*nAlpha) div 255) + ((oRed*oAlpha*byte(255-nAlpha)) div 65025));
+
−    nGreen := min(255,((nGreen*nAlpha) div 255) + ((oGreen*oAlpha*byte(255-nAlpha)) div 65025));
+
−    nBlue  := min(255,((nBlue*nAlpha) div 255) + ((oBlue*oAlpha*byte(255-nAlpha)) div 65025));
+
−    nAlpha := min(255, oAlpha + nAlpha);
+
−
+
−    addBgColor := (nAlpha shl AShift) or (nRed shl RShift) or (nGreen shl GShift) or (nBlue shl BShift);
+
−end;
+
−
+
−procedure FillCircleLines(x, y, dx, dy: LongInt; Value: Longword);
+
−var i: LongInt;
+
−begin
+
−if ((y + dy) and LAND_HEIGHT_MASK) = 0 then
+
−    for i:= Max(x - dx, 0) to Min(x + dx, LAND_WIDTH - 1) do
+
−        if (Land[y + dy, i] and lfIndestructible) = 0 then
+
−            Land[y + dy, i]:= Value;
+
−if ((y - dy) and LAND_HEIGHT_MASK) = 0 then
+
−    for i:= Max(x - dx, 0) to Min(x + dx, LAND_WIDTH - 1) do
+
−        if (Land[y - dy, i] and lfIndestructible) = 0 then
+
−            Land[y - dy, i]:= Value;
+
−if ((y + dx) and LAND_HEIGHT_MASK) = 0 then
+
−    for i:= Max(x - dy, 0) to Min(x + dy, LAND_WIDTH - 1) do
+
−        if (Land[y + dx, i] and lfIndestructible) = 0 then
+
−            Land[y + dx, i]:= Value;
+
−if ((y - dx) and LAND_HEIGHT_MASK) = 0 then
+
−    for i:= Max(x - dy, 0) to Min(x + dy, LAND_WIDTH - 1) do
+
−        if (Land[y - dx, i] and lfIndestructible) = 0 then
+
−            Land[y - dx, i]:= Value;
+
−end;
+
−
+
−procedure ChangeCircleLines(x, y, dx, dy: LongInt; doSet, isCurrent: boolean);
+
−var i: LongInt;
+
−begin
+
−if not doSet then
+
−    begin
+
−    if ((y + dy) and LAND_HEIGHT_MASK) = 0 then
+
−        for i:= Max(x - dx, 0) to Min(x + dx, LAND_WIDTH - 1) do
+
−            if isCurrent then
+
−                Land[y + dy, i]:= Land[y + dy, i] and $FF7F
+
−            else if Land[y + dy, i] and $007F > 0 then
+
−                Land[y + dy, i]:= (Land[y + dy, i] and $FF80) or ((Land[y + dy, i] and $7F) - 1);
+
−    if ((y - dy) and LAND_HEIGHT_MASK) = 0 then
+
−        for i:= Max(x - dx, 0) to Min(x + dx, LAND_WIDTH - 1) do
+
−            if isCurrent then
+
−                Land[y - dy, i]:= Land[y - dy, i] and $FF7F
+
−            else if Land[y - dy, i] and $007F > 0 then
+
−                Land[y - dy, i]:= (Land[y - dy, i] and $FF80) or ((Land[y - dy, i] and $7F) - 1);
+
−    if ((y + dx) and LAND_HEIGHT_MASK) = 0 then
+
−        for i:= Max(x - dy, 0) to Min(x + dy, LAND_WIDTH - 1) do
+
−            if isCurrent then
+
−                Land[y + dx, i]:= Land[y + dx, i] and $FF7F
+
−            else if Land[y + dx, i] and $007F > 0 then
+
−                Land[y + dx, i]:= (Land[y + dx, i] and $FF80) or ((Land[y + dx, i] and $7F) - 1);
+
−    if ((y - dx) and LAND_HEIGHT_MASK) = 0 then
+
−        for i:= Max(x - dy, 0) to Min(x + dy, LAND_WIDTH - 1) do
+
−            if isCurrent then
+
−                Land[y - dx, i]:= Land[y - dx, i] and $FF7F
+
−            else if Land[y - dx, i] and $007F > 0 then
+
−                Land[y - dx, i]:= (Land[y - dx, i] and $FF80) or ((Land[y - dx, i] and $7F) - 1)
+
−    end
+
−else
+
−    begin
+
−    if ((y + dy) and LAND_HEIGHT_MASK) = 0 then
+
−        for i:= Max(x - dx, 0) to Min(x + dx, LAND_WIDTH - 1) do
+
−            if isCurrent then
+
−                Land[y + dy, i]:= Land[y + dy, i] or $80
+
−            else if Land[y + dy, i] and $007F < 127 then
+
−                Land[y + dy, i]:= (Land[y + dy, i] and $FF80) or ((Land[y + dy, i] and $7F) + 1);
+
−    if ((y - dy) and LAND_HEIGHT_MASK) = 0 then
+
−        for i:= Max(x - dx, 0) to Min(x + dx, LAND_WIDTH - 1) do
+
−            if isCurrent then
+
−                Land[y - dy, i]:= Land[y - dy, i] or $80
+
−            else if Land[y - dy, i] and $007F < 127 then
+
−                Land[y - dy, i]:= (Land[y - dy, i] and $FF80) or ((Land[y - dy, i] and $7F) + 1);
+
−    if ((y + dx) and LAND_HEIGHT_MASK) = 0 then
+
−        for i:= Max(x - dy, 0) to Min(x + dy, LAND_WIDTH - 1) do
+
−            if isCurrent then
+
−                Land[y + dx, i]:= Land[y + dx, i] or $80
+
−            else if Land[y + dx, i] and $007F < 127 then
+
−                Land[y + dx, i]:= (Land[y + dx, i] and $FF80) or ((Land[y + dx, i] and $7F) + 1);
+
−    if ((y - dx) and LAND_HEIGHT_MASK) = 0 then
+
−        for i:= Max(x - dy, 0) to Min(x + dy, LAND_WIDTH - 1) do
+
−            if isCurrent then
+
−                Land[y - dx, i]:= Land[y - dx, i] or $80
+
−            else if Land[y - dx, i] and $007F < 127 then
+
−                Land[y - dx, i]:= (Land[y - dx, i] and $FF80) or ((Land[y - dx, i] and $7F) + 1)
+
−    end
+
−end;
+
−
+
−procedure FillRoundInLand(X, Y, Radius: LongInt; Value: Longword);
+
−var dx, dy, d: LongInt;
+
−begin
+
−dx:= 0;
+
−dy:= Radius;
+
−d:= 3 - 2 * Radius;
+
−while (dx < dy) do
+
−    begin
+
−    FillCircleLines(x, y, dx, dy, Value);
+
−    if (d < 0) then
+
−        d:= d + 4 * dx + 6
+
−    else
+
−        begin
+
−        d:= d + 4 * (dx - dy) + 10;
+
−        dec(dy)
+
−        end;
+
−    inc(dx)
+
−    end;
+
−if (dx = dy) then
+
−    FillCircleLines(x, y, dx, dy, Value);
+
−end;
+
−
+
−procedure ChangeRoundInLand(X, Y, Radius: LongInt; doSet, isCurrent: boolean);
+
−var dx, dy, d: LongInt;
+
−begin
+
−dx:= 0;
+
−dy:= Radius;
+
−d:= 3 - 2 * Radius;
+
−while (dx < dy) do
+
−    begin
+
−    ChangeCircleLines(x, y, dx, dy, doSet, isCurrent);
+
−    if (d < 0) then
+
−        d:= d + 4 * dx + 6
+
−    else
+
−        begin
+
−        d:= d + 4 * (dx - dy) + 10;
+
−        dec(dy)
+
−        end;
+
−    inc(dx)
+
−    end;
+
−if (dx = dy) then
+
−    ChangeCircleLines(x, y, dx, dy, doSet, isCurrent)
+
−end;
+
−
+
−procedure FillLandCircleLines0(x, y, dx, dy: LongInt);
+
−var i, t: LongInt;
+
−begin
+
−t:= y + dy;
+
−if (t and LAND_HEIGHT_MASK) = 0 then
+
−    for i:= Max(x - dx, 0) to Min(x + dx, LAND_WIDTH - 1) do
+
−        if ((Land[t, i] and lfIndestructible) = 0) and (not disableLandBack or (Land[t, i] > 255))  then
+
−            if (cReducedQuality and rqBlurryLand) = 0 then
+
−                LandPixels[t, i]:= 0
+
−            else
+
−                LandPixels[t div 2, i div 2]:= 0;
+
−
+
−t:= y - dy;
+
−if (t and LAND_HEIGHT_MASK) = 0 then
+
−    for i:= Max(x - dx, 0) to Min(x + dx, LAND_WIDTH - 1) do
+
−        if ((Land[t, i] and lfIndestructible) = 0) and (not disableLandBack or (Land[t, i] > 255))  then
+
−            if (cReducedQuality and rqBlurryLand) = 0 then
+
−                LandPixels[t, i]:= 0
+
−            else
+
−                LandPixels[t div 2, i div 2]:= 0;
+
−
+
−t:= y + dx;
+
−if (t and LAND_HEIGHT_MASK) = 0 then
+
−    for i:= Max(x - dy, 0) to Min(x + dy, LAND_WIDTH - 1) do
+
−        if ((Land[t, i] and lfIndestructible) = 0) and (not disableLandBack or (Land[t, i] > 255))  then
+
−            if (cReducedQuality and rqBlurryLand) = 0 then
+
−                LandPixels[t, i]:= 0
+
−            else
+
−                LandPixels[t div 2, i div 2]:= 0;
+
−
+
−t:= y - dx;
+
−if (t and LAND_HEIGHT_MASK) = 0 then
+
−    for i:= Max(x - dy, 0) to Min(x + dy, LAND_WIDTH - 1) do
+
−        if ((Land[t, i] and lfIndestructible) = 0) and (not disableLandBack or (Land[t, i] > 255))  then
+
−            if (cReducedQuality and rqBlurryLand) = 0 then
+
−                LandPixels[t, i]:= 0
+
−            else
+
−                LandPixels[t div 2, i div 2]:= 0;
+
−
+
−end;
+
−
+
−function FillLandCircleLinesBG(x, y, dx, dy: LongInt): Longword;
+
−var i, t, by, bx: LongInt;
+
−    cnt: Longword;
+
−begin
+
−cnt:= 0;
+
−t:= y + dy;
+
−if (t and LAND_HEIGHT_MASK) = 0 then
+
−    for i:= Max(x - dx, 0) to Min(x + dx, LAND_WIDTH - 1) do
+
−        if (Land[t, i] and lfIndestructible) = 0 then
+
−            begin
+
−            if (cReducedQuality and rqBlurryLand) = 0 then
+
−                begin
+
−                by:= t; bx:= i;
+
−                end
+
−            else
+
−                begin
+
−                by:= t div 2; bx:= i div 2;
+
−                end;
+
−            if ((Land[t, i] and lfBasic) <> 0) and (((LandPixels[by,bx] and AMask) shr AShift) = 255) and (not disableLandBack) then
+
−                begin
+
−                inc(cnt);
+
−                LandPixels[by, bx]:= LandBackPixel(i, t)
+
−                end
+
−            else if ((Land[t, i] and lfObject) <> 0) or (((LandPixels[by,bx] and AMask) shr AShift) < 255) then
+
−                LandPixels[by, bx]:= 0
+
−            end;
+
−
+
−t:= y - dy;
+
−if (t and LAND_HEIGHT_MASK) = 0 then
+
−    for i:= Max(x - dx, 0) to Min(x + dx, LAND_WIDTH - 1) do
+
−        if (Land[t, i] and lfIndestructible) = 0 then
+
−            begin
+
−            if (cReducedQuality and rqBlurryLand) = 0 then
+
−                begin
+
−                by:= t; bx:= i;
+
−                end
+
−            else
+
−                begin
+
−                by:= t div 2; bx:= i div 2;
+
−                end;
+
−            if ((Land[t, i] and lfBasic) <> 0) and (((LandPixels[by,bx] and AMask) shr AShift) = 255) and (not disableLandBack) then
+
−                begin
+
−                inc(cnt);
+
−                LandPixels[by, bx]:= LandBackPixel(i, t)
+
−                end
+
−            else if ((Land[t, i] and lfObject) <> 0) or (((LandPixels[by,bx] and AMask) shr AShift) < 255) then
+
−                LandPixels[by, bx]:= 0
+
−            end;
+
−
+
−t:= y + dx;
+
−if (t and LAND_HEIGHT_MASK) = 0 then
+
−    for i:= Max(x - dy, 0) to Min(x + dy, LAND_WIDTH - 1) do
+
−        if (Land[t, i] and lfIndestructible) = 0 then
+
−            begin
+
−            if (cReducedQuality and rqBlurryLand) = 0 then
+
−                begin
+
−                by:= t; bx:= i;
+
−                end
+
−            else
+
−                begin
+
−                by:= t div 2; bx:= i div 2;
+
−                end;
+
−            if ((Land[t, i] and lfBasic) <> 0) and (((LandPixels[by,bx] and AMask) shr AShift) = 255) and (not disableLandBack) then
+
−                begin
+
−                inc(cnt);
+
−                LandPixels[by, bx]:= LandBackPixel(i, t)
+
−                end
+
−            else if ((Land[t, i] and lfObject) <> 0) or (((LandPixels[by,bx] and AMask) shr AShift) < 255) then
+
−                LandPixels[by, bx]:= 0
+
−            end;
+
−t:= y - dx;
+
−if (t and LAND_HEIGHT_MASK) = 0 then
+
−    for i:= Max(x - dy, 0) to Min(x + dy, LAND_WIDTH - 1) do
+
−        if (Land[t, i] and lfIndestructible) = 0 then
+
−            begin
+
−            if (cReducedQuality and rqBlurryLand) = 0 then
+
−                begin
+
−                by:= t; bx:= i;
+
−                end
+
−            else
+
−                begin
+
−                by:= t div 2; bx:= i div 2;
+
−                end;
+
−            if ((Land[t, i] and lfBasic) <> 0) and (((LandPixels[by,bx] and AMask) shr AShift) = 255) and (not disableLandBack) then
+
−                begin
+
−                inc(cnt);
+
−                LandPixels[by, bx]:= LandBackPixel(i, t)
+
−                end
+
−            else if ((Land[t, i] and lfObject) <> 0) or (((LandPixels[by,bx] and AMask) shr AShift) < 255) then
+
−                LandPixels[by, bx]:= 0
+
−            end;
+
−FillLandCircleLinesBG:= cnt;
+
−end;
+
−
+
−procedure FillLandCircleLinesEBC(x, y, dx, dy: LongInt);
+
−var i, t: LongInt;
+
−begin
+
−t:= y + dy;
+
−if (t and LAND_HEIGHT_MASK) = 0 then
+
−    for i:= Max(x - dx, 0) to Min(x + dx, LAND_WIDTH - 1) do
+
−        if ((Land[t, i] and lfBasic) <> 0) or ((Land[t, i] and lfObject) <> 0) then
+
−            begin
+
−            if (cReducedQuality and rqBlurryLand) = 0 then
+
−                LandPixels[t, i]:= ExplosionBorderColor
+
−            else
+
−                LandPixels[t div 2, i div 2]:= ExplosionBorderColor;
+
−
+
−            Land[t, i]:= Land[t, i] or lfDamaged;
+
−            //Despeckle(i, t);
+
−            LandDirty[t div 32, i div 32]:= 1;
+
−            end;
+
−
+
−t:= y - dy;
+
−if (t and LAND_HEIGHT_MASK) = 0 then
+
−    for i:= Max(x - dx, 0) to Min(x + dx, LAND_WIDTH - 1) do
+
−        if ((Land[t, i] and lfBasic) <> 0) or ((Land[t, i] and lfObject) <> 0) then
+
−            begin
+
−            if (cReducedQuality and rqBlurryLand) = 0 then
+
−                LandPixels[t, i]:= ExplosionBorderColor
+
−            else
+
−                LandPixels[t div 2, i div 2]:= ExplosionBorderColor;
+
−            Land[t, i]:= Land[t, i] or lfDamaged;
+
−            //Despeckle(i, t);
+
−            LandDirty[t div 32, i div 32]:= 1;
+
−            end;
+
−
+
−t:= y + dx;
+
−if (t and LAND_HEIGHT_MASK) = 0 then
+
−    for i:= Max(x - dy, 0) to Min(x + dy, LAND_WIDTH - 1) do
+
−        if ((Land[t, i] and lfBasic) <> 0) or ((Land[t, i] and lfObject) <> 0) then
+
−            begin
+
−            if (cReducedQuality and rqBlurryLand) = 0 then
+
−                LandPixels[t, i]:= ExplosionBorderColor
+
−            else
+
−               LandPixels[t div 2, i div 2]:= ExplosionBorderColor;
+
−
+
−            Land[t, i]:= Land[t, i] or lfDamaged;
+
−            //Despeckle(i, t);
+
−            LandDirty[t div 32, i div 32]:= 1;
+
−            end;
+
−
+
−t:= y - dx;
+
−if (t and LAND_HEIGHT_MASK) = 0 then
+
−    for i:= Max(x - dy, 0) to Min(x + dy, LAND_WIDTH - 1) do
+
−        if ((Land[t, i] and lfBasic) <> 0) or ((Land[t, i] and lfObject) <> 0) then
+
−            begin
+
−            if (cReducedQuality and rqBlurryLand) = 0 then
+
−                LandPixels[t, i]:= ExplosionBorderColor
+
−            else
+
−                LandPixels[t div 2, i div 2]:= ExplosionBorderColor;
+
−
+
−            Land[t, i]:= Land[t, i] or lfDamaged;
+
−            //Despeckle(i, y - dy);
+
−            LandDirty[t div 32, i div 32]:= 1;
+
−            end;
+
−end;
+
−
+
−function DrawExplosion(X, Y, Radius: LongInt): Longword;
+
−var dx, dy, ty, tx, d: LongInt;
+
−    cnt: Longword;
+
−begin
+
−
+
−// draw background land texture
+
−    begin
+
−    cnt:= 0;
+
−    dx:= 0;
+
−    dy:= Radius;
+
−    d:= 3 - 2 * Radius;
+
−
+
−    while (dx < dy) do
+
−        begin
+
−        inc(cnt, FillLandCircleLinesBG(x, y, dx, dy));
+
−        if (d < 0) then
+
−            d:= d + 4 * dx + 6
+
−        else
+
−            begin
+
−            d:= d + 4 * (dx - dy) + 10;
+
−            dec(dy)
+
−            end;
+
−        inc(dx)
+
−        end;
+
−    if (dx = dy) then
+
−        inc(cnt, FillLandCircleLinesBG(x, y, dx, dy));
+
−    end;
+
−
+
−// draw a hole in land
+
−if Radius > 20 then
+
−    begin
+
−    dx:= 0;
+
−    dy:= Radius - 15;
+
−    d:= 3 - 2 * dy;
+
−
+
−    while (dx < dy) do
+
−        begin
+
−        FillLandCircleLines0(x, y, dx, dy);
+
−        if (d < 0) then
+
−            d:= d + 4 * dx + 6
+
−        else
+
−            begin
+
−            d:= d + 4 * (dx - dy) + 10;
+
−            dec(dy)
+
−            end;
+
−        inc(dx)
+
−        end;
+
−    if (dx = dy) then
+
−        FillLandCircleLines0(x, y, dx, dy);
+
−    end;
+
−
+
−  // FillRoundInLand after erasing land pixels to allow Land 0 check for mask.png to function
+
−    FillRoundInLand(X, Y, Radius, 0);
+
−
+
−// draw explosion border
+
−    begin
+
−    inc(Radius, 4);
+
−    dx:= 0;
+
−    dy:= Radius;
+
−    d:= 3 - 2 * Radius;
+
−    while (dx < dy) do
+
−        begin
+
−        FillLandCircleLinesEBC(x, y, dx, dy);
+
−        if (d < 0) then
+
−            d:= d + 4 * dx + 6
+
−        else
+
−            begin
+
−            d:= d + 4 * (dx - dy) + 10;
+
−            dec(dy)
+
−            end;
+
−        inc(dx)
+
−        end;
+
−    if (dx = dy) then
+
−        FillLandCircleLinesEBC(x, y, dx, dy);
+
−    end;
+
−
+
−tx:= Max(X - Radius - 1, 0);
+
−dx:= Min(X + Radius + 1, LAND_WIDTH) - tx;
+
−ty:= Max(Y - Radius - 1, 0);
+
−dy:= Min(Y + Radius + 1, LAND_HEIGHT) - ty;
+
−UpdateLandTexture(tx, dx, ty, dy, false);
+
−DrawExplosion:= cnt
+
−end;
+
−
+
−procedure DrawHLinesExplosions(ar: PRangeArray; Radius: LongInt; y, dY: LongInt; Count: Byte);
+
−var tx, ty, by, bx,  i: LongInt;
+
−begin
+
−for i:= 0 to Pred(Count) do
+
−    begin
+
−    for ty:= Max(y - Radius, 0) to Min(y + Radius, LAND_HEIGHT) do
+
−        for tx:= Max(0, ar^[i].Left - Radius) to Min(LAND_WIDTH, ar^[i].Right + Radius) do
+
−            begin
+
−            if (Land[ty, tx] and lfIndestructible) = 0 then
+
−                begin
+
−                if (cReducedQuality and rqBlurryLand) = 0 then
+
−                    begin
+
−                    by:= ty; bx:= tx;
+
−                    end
+
−                else
+
−                    begin
+
−                    by:= ty div 2; bx:= tx div 2;
+
−                    end;
+
−                if ((Land[ty, tx] and lfBasic) <> 0) and (((LandPixels[by,bx] and AMask) shr AShift) = 255) and (not disableLandBack) then
+
−                    LandPixels[by, bx]:= LandBackPixel(tx, ty)
+
−                else if ((Land[ty, tx] and lfObject) <> 0) or (((LandPixels[by,bx] and AMask) shr AShift) < 255) then
+
−                    LandPixels[by, bx]:= 0
+
−                end
+
−            end;
+
−    inc(y, dY)
+
−    end;
+
−
+
−inc(Radius, 4);
+
−dec(y, Count * dY);
+
−
+
−for i:= 0 to Pred(Count) do
+
−    begin
+
−    for ty:= Max(y - Radius, 0) to Min(y + Radius, LAND_HEIGHT) do
+
−        for tx:= Max(0, ar^[i].Left - Radius) to Min(LAND_WIDTH, ar^[i].Right + Radius) do
+
−            if ((Land[ty, tx] and lfBasic) <> 0) or ((Land[ty, tx] and lfObject) <> 0) then
+
−                begin
+
−                 if (cReducedQuality and rqBlurryLand) = 0 then
+
−                    LandPixels[ty, tx]:= ExplosionBorderColor
+
−                else
+
−                    LandPixels[ty div 2, tx div 2]:= ExplosionBorderColor;
+
−
+
−                Land[ty, tx]:= Land[ty, tx] or lfDamaged;
+
−                LandDirty[ty div 32, tx div 32]:= 1;
+
−                end;
+
−    inc(y, dY)
+
−    end;
+
−
+
−
+
−UpdateLandTexture(0, LAND_WIDTH, 0, LAND_HEIGHT, false)
+
−end;
+
−
+
−//
+
−//  - (dX, dY) - direction, vector of length = 0.5
+
−//
+
−procedure DrawTunnel(X, Y, dX, dY: hwFloat; ticks, HalfWidth: LongInt);
+
−var nx, ny, dX8, dY8: hwFloat;
+
−    i, t, tx, ty, by, bx, stX, stY, ddy, ddx: Longint;
+
−    despeckle : Boolean;
+
−begin  // (-dY, dX) is (dX, dY) rotated by PI/2
+
−stY:= hwRound(Y);
+
−stX:= hwRound(X);
+
−
+
−despeckle:= HalfWidth > 1;
+
−
+
−nx:= X + dY * (HalfWidth + 8);
+
−ny:= Y - dX * (HalfWidth + 8);
+
−
+
−dX8:= dX * 8;
+
−dY8:= dY * 8;
+
−for i:= 0 to 7 do
+
−    begin
+
−    X:= nx - dX8;
+
−    Y:= ny - dY8;
+
−    for t:= -8 to ticks + 8 do
+
−    begin
+
−    X:= X + dX;
+
−    Y:= Y + dY;
+
−    tx:= hwRound(X);
+
−    ty:= hwRound(Y);
+
−    if ((ty and LAND_HEIGHT_MASK) = 0)
+
−    and ((tx and LAND_WIDTH_MASK) = 0)
+
−    and (((Land[ty, tx] and lfBasic) <> 0) or ((Land[ty, tx] and lfObject) <> 0)) then
+
−        begin
+
−        if despeckle then
+
−            begin
+
−            Land[ty, tx]:= Land[ty, tx] or lfDamaged;
+
−            LandDirty[ty div 32, tx div 32]:= 1
+
−            end;
+
−        if (cReducedQuality and rqBlurryLand) = 0 then
+
−            LandPixels[ty, tx]:= ExplosionBorderColor
+
−        else
+
−            LandPixels[ty div 2, tx div 2]:= ExplosionBorderColor
+
−        end
+
−    end;
+
−    nx:= nx - dY;
+
−    ny:= ny + dX;
+
−    end;
+
−
+
−for i:= -HalfWidth to HalfWidth do
+
−    begin
+
−    X:= nx - dX8;
+
−    Y:= ny - dY8;
+
−    for t:= 0 to 7 do
+
−        begin
+
−        X:= X + dX;
+
−        Y:= Y + dY;
+
−        tx:= hwRound(X);
+
−        ty:= hwRound(Y);
+
−        if ((ty and LAND_HEIGHT_MASK) = 0) and ((tx and LAND_WIDTH_MASK) = 0) and (((Land[ty, tx] and lfBasic) <> 0)
+
−        or ((Land[ty, tx] and lfObject) <> 0)) then
+
−            begin
+
−            Land[ty, tx]:= Land[ty, tx] or lfDamaged;
+
−            if despeckle then
+
−                LandDirty[ty div 32, tx div 32]:= 1;
+
−            if (cReducedQuality and rqBlurryLand) = 0 then
+
−                LandPixels[ty, tx]:= ExplosionBorderColor
+
−            else
+
−                LandPixels[ty div 2, tx div 2]:= ExplosionBorderColor
+
−            end
+
−        end;
+
−    X:= nx;
+
−    Y:= ny;
+
−    for t:= 0 to ticks do
+
−        begin
+
−        X:= X + dX;
+
−        Y:= Y + dY;
+
−        tx:= hwRound(X);
+
−        ty:= hwRound(Y);
+
−        if ((ty and LAND_HEIGHT_MASK) = 0) and ((tx and LAND_WIDTH_MASK) = 0) and ((Land[ty, tx] and lfIndestructible) = 0) then
+
−            begin
+
−            if (cReducedQuality and rqBlurryLand) = 0 then
+
−                begin
+
−                by:= ty; bx:= tx;
+
−                end
+
−            else
+
−                begin
+
−                by:= ty div 2; bx:= tx div 2;
+
−                end;
+
−            if ((Land[ty, tx] and lfBasic) <> 0) and (((LandPixels[by,bx] and AMask) shr AShift) = 255) and (not disableLandBack) then
+
−                LandPixels[by, bx]:= LandBackPixel(tx, ty)
+
−            else if ((Land[ty, tx] and lfObject) <> 0) or (((LandPixels[by,bx] and AMask) shr AShift) < 255) then
+
−                LandPixels[by, bx]:= 0;
+
−            Land[ty, tx]:= 0;
+
−            end
+
−        end;
+
−    for t:= 0 to 7 do
+
−    begin
+
−    X:= X + dX;
+
−    Y:= Y + dY;
+
−    tx:= hwRound(X);
+
−    ty:= hwRound(Y);
+
−    if ((ty and LAND_HEIGHT_MASK) = 0) and ((tx and LAND_WIDTH_MASK) = 0) and (((Land[ty, tx] and lfBasic) <> 0)
+
−    or ((Land[ty, tx] and lfObject) <> 0)) then
+
−        begin
+
−        Land[ty, tx]:= Land[ty, tx] or lfDamaged;
+
−        if despeckle then
+
−            LandDirty[ty div 32, tx div 32]:= 1;
+
−        if (cReducedQuality and rqBlurryLand) = 0 then
+
−            LandPixels[ty, tx]:= ExplosionBorderColor
+
−        else
+
−            LandPixels[ty div 2, tx div 2]:= ExplosionBorderColor
+
−        end
+
−        end;
+
−    nx:= nx - dY;
+
−    ny:= ny + dX;
+
−    end;
+
−
+
−for i:= 0 to 7 do
+
−    begin
+
−    X:= nx - dX8;
+
−    Y:= ny - dY8;
+
−    for t:= -8 to ticks + 8 do
+
−    begin
+
−    X:= X + dX;
+
−    Y:= Y + dY;
+
−    tx:= hwRound(X);
+
−    ty:= hwRound(Y);
+
−    if ((ty and LAND_HEIGHT_MASK) = 0) and ((tx and LAND_WIDTH_MASK) = 0) and (((Land[ty, tx] and lfBasic) <> 0)
+
−    or ((Land[ty, tx] and lfObject) <> 0)) then
+
−        begin
+
−        Land[ty, tx]:= Land[ty, tx] or lfDamaged;
+
−        if despeckle then
+
−            LandDirty[ty div 32, tx div 32]:= 1;
+
−        if (cReducedQuality and rqBlurryLand) = 0 then
+
−            LandPixels[ty, tx]:= ExplosionBorderColor
+
−        else
+
−            LandPixels[ty div 2, tx div 2]:= ExplosionBorderColor
+
−        end
+
−    end;
+
−    nx:= nx - dY;
+
−    ny:= ny + dX;
+
−    end;
+
−
+
−tx:= Max(stX - HalfWidth * 2 - 4 - abs(hwRound(dX * ticks)), 0);
+
−ty:= Max(stY - HalfWidth * 2 - 4 - abs(hwRound(dY * ticks)), 0);
+
−ddx:= Min(stX + HalfWidth * 2 + 4 + abs(hwRound(dX * ticks)), LAND_WIDTH) - tx;
+
−ddy:= Min(stY + HalfWidth * 2 + 4 + abs(hwRound(dY * ticks)), LAND_HEIGHT) - ty;
+
−
+
−UpdateLandTexture(tx, ddx, ty, ddy, false)
+
−end;
+
−
+
−function TryPlaceOnLand(cpX, cpY: LongInt; Obj: TSprite; Frame: LongInt; doPlace: boolean; indestructible: boolean): boolean;
+
−var X, Y, bpp, h, w, row, col, gx, gy, numFramesFirstCol: LongInt;
+
−    p: PByteArray;
+
−    Image: PSDL_Surface;
+
−begin
+
−TryPlaceOnLand:= false;
+
−numFramesFirstCol:= SpritesData[Obj].imageHeight div SpritesData[Obj].Height;
+
−
+
−TryDo(SpritesData[Obj].Surface <> nil, 'Assert SpritesData[Obj].Surface failed', true);
+
−Image:= SpritesData[Obj].Surface;
+
−w:= SpritesData[Obj].Width;
+
−h:= SpritesData[Obj].Height;
+
−row:= Frame mod numFramesFirstCol;
+
−col:= Frame div numFramesFirstCol;
+
−
+
−if SDL_MustLock(Image) then
+
−    SDLTry(SDL_LockSurface(Image) >= 0, true);
+
−
+
−bpp:= Image^.format^.BytesPerPixel;
+
−TryDo(bpp = 4, 'It should be 32 bpp sprite', true);
+
−// Check that sprite fits free space
+
−p:= @(PByteArray(Image^.pixels)^[ Image^.pitch * row * h + col * w * 4 ]);
+
−case bpp of
+
−    4: for y:= 0 to Pred(h) do
+
−        begin
+
−        for x:= 0 to Pred(w) do
+
−            if (PLongword(@(p^[x * 4]))^) <> 0 then
+
−                if ((cpY + y) <= Longint(topY)) or ((cpY + y) >= LAND_HEIGHT) or
+
−                   ((cpX + x) <= Longint(leftX)) or ((cpX + x) >= Longint(rightX)) or (Land[cpY + y, cpX + x] <> 0) then
+
−                    begin
+
−                        if SDL_MustLock(Image) then
+
−                            SDL_UnlockSurface(Image);
+
−                        exit;
+
−                    end;
+
−        p:= @(p^[Image^.pitch]);
+
−        end;
+
−    end;
+
−
+
−TryPlaceOnLand:= true;
+
−if not doPlace then
+
−    begin
+
−    if SDL_MustLock(Image) then
+
−        SDL_UnlockSurface(Image);
+
−    exit
+
−    end;
+
−
+
−// Checked, now place
+
−p:= @(PByteArray(Image^.pixels)^[ Image^.pitch * row * h + col * w * 4 ]);
+
−case bpp of
+
−    4: for y:= 0 to Pred(h) do
+
−        begin
+
−        for x:= 0 to Pred(w) do
+
−            if (PLongword(@(p^[x * 4]))^) <> 0 then
+
−                   begin
+
−                if (cReducedQuality and rqBlurryLand) = 0 then
+
−                    begin
+
−                    gX:= cpX + x;
+
−                    gY:= cpY + y;
+
−                    end
+
−                else
+
−                     begin
+
−                     gX:= (cpX + x) div 2;
+
−                     gY:= (cpY + y) div 2;
+
−                    end;
+
−                if indestructible then
+
−                    Land[cpY + y, cpX + x]:= lfIndestructible
+
−                else if (LandPixels[gY, gX] and AMask) shr AShift = 255 then  // This test assumes lfBasic and lfObject differ only graphically
+
−                    Land[cpY + y, cpX + x]:= lfBasic
+
−                else
+
−                    Land[cpY + y, cpX + x]:= lfObject;
+
−                // For testing only. Intent is to flag this on objects with masks, or use it for an ice ray gun
+
−                if (Theme = 'Snow') or (Theme = 'Christmas') then
+
−                    Land[cpY + y, cpX + x]:= Land[cpY + y, cpX + x] or lfIce;
+
−                    LandPixels[gY, gX]:= PLongword(@(p^[x * 4]))^
+
−                end;
+
−        p:= @(p^[Image^.pitch]);
+
−        end;
+
−    end;
+
−if SDL_MustLock(Image) then
+
−    SDL_UnlockSurface(Image);
+
−
+
−x:= Max(cpX, leftX);
+
−w:= Min(cpX + Image^.w, LAND_WIDTH) - x;
+
−y:= Max(cpY, topY);
+
−h:= Min(cpY + Image^.h, LAND_HEIGHT) - y;
+
−UpdateLandTexture(x, w, y, h, true)
+
−end;
+
−
+
−function Despeckle(X, Y: LongInt): boolean;
+
−var nx, ny, i, j, c, xx, yy: LongInt;
+
−    pixelsweep: boolean;
+
−begin
+
−    Despeckle:= true;
+
−
+
−    if (cReducedQuality and rqBlurryLand) = 0 then
+
−    begin
+
−        xx:= X;
+
−        yy:= Y;
+
−    end
+
−    else
+
−    begin
+
−        xx:= X div 2;
+
−        yy:= Y div 2;
+
−    end;
+
−
+
−    pixelsweep:= ((Land[Y, X] and $FF00) = 0) and (LandPixels[yy, xx] <> 0);
+
−    if (((Land[Y, X] and lfDamaged) <> 0) and ((Land[Y, X] and lfIndestructible) = 0)) or pixelsweep then
+
−    begin
+
−        c:= 0;
+
−        for i:= -1 to 1 do
+
−            for j:= -1 to 1 do
+
−                if (i <> 0) or (j <> 0) then
+
−                begin
+
−                    ny:= Y + i;
+
−                    nx:= X + j;
+
−                    if ((ny and LAND_HEIGHT_MASK) = 0) and ((nx and LAND_WIDTH_MASK) = 0) then
+
−                    begin
+
−                        if pixelsweep then
+
−                        begin
+
−                            if ((cReducedQuality and rqBlurryLand) <> 0) then
+
−                            begin
+
−                                nx:= nx div 2;
+
−                                ny:= ny div 2
+
−                            end;
+
−                            if LandPixels[ny, nx] <> 0 then
+
−                                inc(c);
+
−                        end
+
−                    else if Land[ny, nx] > 255 then
+
−                        inc(c);
+
−                    end
+
−                end;
+
−
+
−        if c < 4 then // 0-3 neighbours
+
−        begin
+
−            if ((Land[Y, X] and lfBasic) <> 0) and (not disableLandBack) then
+
−                LandPixels[yy, xx]:= LandBackPixel(X, Y)
+
−            else
+
−                LandPixels[yy, xx]:= 0;
+
−
+
−            if not pixelsweep then
+
−            begin
+
−                Land[Y, X]:= 0;
+
−                exit
+
−            end
+
−        end;
+
−    end;
+
−    Despeckle:= false
+
−end;
+
−
+
−procedure Smooth(X, Y: LongInt);
+
−begin
+
−// a bit of AA for explosions
+
−if (Land[Y, X] = 0) and (Y > LongInt(topY) + 1) and
+
−    (Y < LAND_HEIGHT-2) and (X > LongInt(leftX) + 1) and (X < LongInt(rightX) - 1) then
+
−    begin
+
−    if ((((Land[y, x-1] and lfDamaged) <> 0) and (((Land[y+1,x] and lfDamaged) <> 0)) or ((Land[y-1,x] and lfDamaged) <> 0))
+
−    or (((Land[y, x+1] and lfDamaged) <> 0) and (((Land[y-1,x] and lfDamaged) <> 0) or ((Land[y+1,x] and lfDamaged) <> 0)))) then
+
−        begin
+
−        if (cReducedQuality and rqBlurryLand) = 0 then
+
−            begin
+
−            if ((LandPixels[y,x] and AMask) shr AShift) < 10 then
+
−                LandPixels[y,x]:= (ExplosionBorderColor and (not AMask)) or (128 shl AShift)
+
−            else
+
−                LandPixels[y,x]:=
+
−                                (((((LandPixels[y,x] and RMask shr RShift) div 2)+((ExplosionBorderColor and RMask) shr RShift) div 2) and $FF) shl RShift) or
+
−                                (((((LandPixels[y,x] and GMask shr GShift) div 2)+((ExplosionBorderColor and GMask) shr GShift) div 2) and $FF) shl GShift) or
+
−                                (((((LandPixels[y,x] and BMask shr BShift) div 2)+((ExplosionBorderColor and BMask) shr BShift) div 2) and $FF) shl BShift) or ($FF shl AShift)
+
−            end;
+
−        if (Land[y, x-1] = lfObject) then
+
−            Land[y,x]:= lfObject
+
−        else if (Land[y, x+1] = lfObject) then
+
−            Land[y,x]:= lfObject
+
−        else
+
−            Land[y,x]:= lfBasic;
+
−        end
+
−    else if ((((Land[y, x-1] and lfDamaged) <> 0) and ((Land[y+1,x-1] and lfDamaged) <> 0) and ((Land[y+2,x] and lfDamaged) <> 0))
+
−    or (((Land[y, x-1] and lfDamaged) <> 0) and ((Land[y-1,x-1] and lfDamaged) <> 0) and ((Land[y-2,x] and lfDamaged) <> 0))
+
−    or (((Land[y, x+1] and lfDamaged) <> 0) and ((Land[y+1,x+1] and lfDamaged) <> 0) and ((Land[y+2,x] and lfDamaged) <> 0))
+
−    or (((Land[y, x+1] and lfDamaged) <> 0) and ((Land[y-1,x+1] and lfDamaged) <> 0) and ((Land[y-2,x] and lfDamaged) <> 0))
+
−    or (((Land[y+1, x] and lfDamaged) <> 0) and ((Land[y+1,x+1] and lfDamaged) <> 0) and ((Land[y,x+2] and lfDamaged) <> 0))
+
−    or (((Land[y-1, x] and lfDamaged) <> 0) and ((Land[y-1,x+1] and lfDamaged) <> 0) and ((Land[y,x+2] and lfDamaged) <> 0))
+
−    or (((Land[y+1, x] and lfDamaged) <> 0) and ((Land[y+1,x-1] and lfDamaged) <> 0) and ((Land[y,x-2] and lfDamaged) <> 0))
+
−    or (((Land[y-1, x] and lfDamaged) <> 0) and ((Land[y-1,x-1] and lfDamaged) <> 0) and ((Land[y,x-2] and lfDamaged) <> 0))) then
+
−        begin
+
−        if (cReducedQuality and rqBlurryLand) = 0 then
+
−            begin
+
−            if ((LandPixels[y,x] and AMask) shr AShift) < 10 then
+
−                LandPixels[y,x]:= (ExplosionBorderColor and (not AMask)) or (64 shl AShift)
+
−            else
+
−                LandPixels[y,x]:=
+
−                                (((((LandPixels[y,x] and RMask shr RShift) * 3 div 4)+((ExplosionBorderColor and RMask) shr RShift) div 4) and $FF) shl RShift) or
+
−                                (((((LandPixels[y,x] and GMask shr GShift) * 3 div 4)+((ExplosionBorderColor and GMask) shr GShift) div 4) and $FF) shl GShift) or
+
−                                (((((LandPixels[y,x] and BMask shr BShift) * 3 div 4)+((ExplosionBorderColor and BMask) shr BShift) div 4) and $FF) shl BShift) or ($FF shl AShift)
+
−            end;
+
−        if (Land[y, x-1] = lfObject) then
+
−            Land[y, x]:= lfObject
+
−        else if (Land[y, x+1] = lfObject) then
+
−            Land[y, x]:= lfObject
+
−        else if (Land[y+1, x] = lfObject) then
+
−            Land[y, x]:= lfObject
+
−        else if (Land[y-1, x] = lfObject) then
+
−        Land[y, x]:= lfObject
+
−        else Land[y,x]:= lfBasic
+
−        end
+
−    end
+
−else if ((cReducedQuality and rqBlurryLand) = 0) and (LandPixels[Y, X] and AMask = 255)
+
−and ((Land[Y, X] and (lfDamaged or lfBasic) = lfBasic) or (Land[Y, X] and (lfDamaged or lfBasic) = lfBasic))
+
−and (Y > LongInt(topY) + 1) and (Y < LAND_HEIGHT-2) and (X > LongInt(leftX) + 1) and (X < LongInt(rightX) - 1) then
+
−    begin
+
−    if ((((Land[y, x-1] and lfDamaged) <> 0) and (((Land[y+1,x] and lfDamaged) <> 0)) or ((Land[y-1,x] and lfDamaged) <> 0))
+
−    or (((Land[y, x+1] and lfDamaged) <> 0) and (((Land[y-1,x] and lfDamaged) <> 0) or ((Land[y+1,x] and lfDamaged) <> 0)))) then
+
−        begin
+
−        LandPixels[y,x]:=
+
−                        (((((LandPixels[y,x] and RMask shr RShift) div 2)+((ExplosionBorderColor and RMask) shr RShift) div 2) and $FF) shl RShift) or
+
−                        (((((LandPixels[y,x] and GMask shr GShift) div 2)+((ExplosionBorderColor and GMask) shr GShift) div 2) and $FF) shl GShift) or
+
−                        (((((LandPixels[y,x] and BMask shr BShift) div 2)+((ExplosionBorderColor and BMask) shr BShift) div 2) and $FF) shl BShift) or ($FF shl AShift)
+
−        end
+
−    else if ((((Land[y, x-1] and lfDamaged) <> 0) and ((Land[y+1,x-1] and lfDamaged) <> 0) and ((Land[y+2,x] and lfDamaged) <> 0))
+
−    or (((Land[y, x-1] and lfDamaged) <> 0) and ((Land[y-1,x-1] and lfDamaged) <> 0) and ((Land[y-2,x] and lfDamaged) <> 0))
+
−    or (((Land[y, x+1] and lfDamaged) <> 0) and ((Land[y+1,x+1] and lfDamaged) <> 0) and ((Land[y+2,x] and lfDamaged) <> 0))
+
−    or (((Land[y, x+1] and lfDamaged) <> 0) and ((Land[y-1,x+1] and lfDamaged) <> 0) and ((Land[y-2,x] and lfDamaged) <> 0))
+
−    or (((Land[y+1, x] and lfDamaged) <> 0) and ((Land[y+1,x+1] and lfDamaged) <> 0) and ((Land[y,x+2] and lfDamaged) <> 0))
+
−    or (((Land[y-1, x] and lfDamaged) <> 0) and ((Land[y-1,x+1] and lfDamaged) <> 0) and ((Land[y,x+2] and lfDamaged) <> 0))
+
−    or (((Land[y+1, x] and lfDamaged) <> 0) and ((Land[y+1,x-1] and lfDamaged) <> 0) and ((Land[y,x-2] and lfDamaged) <> 0))
+
−    or (((Land[y-1, x] and lfDamaged) <> 0) and ((Land[y-1,x-1] and lfDamaged) <> 0) and ((Land[y,x-2] and lfDamaged) <> 0))) then
+
−        begin
+
−        LandPixels[y,x]:=
+
−                        (((((LandPixels[y,x] and RMask shr RShift) * 3 div 4)+((ExplosionBorderColor and RMask) shr RShift) div 4) and $FF) shl RShift) or
+
−                        (((((LandPixels[y,x] and GMask shr GShift) * 3 div 4)+((ExplosionBorderColor and GMask) shr GShift) div 4) and $FF) shl GShift) or
+
−                        (((((LandPixels[y,x] and BMask shr BShift) * 3 div 4)+((ExplosionBorderColor and BMask) shr BShift) div 4) and $FF) shl BShift) or ($FF shl AShift)
+
−        end
+
−    end
+
−end;
+
−
+
−function SweepDirty: boolean;
+
−var x, y, xx, yy, ty, tx: LongInt;
+
−    bRes, updateBlock, resweep, recheck: boolean;
+
−begin
+
−bRes:= false;
+
−reCheck:= true;
+
−
+
−while recheck do
+
−    begin
+
−    recheck:= false;
+
−    for y:= 0 to LAND_HEIGHT div 32 - 1 do
+
−        begin
+
−        for x:= 0 to LAND_WIDTH div 32 - 1 do
+
−            begin
+
−            if LandDirty[y, x] = 1 then
+
−                begin
+
−                updateBlock:= false;
+
−                resweep:= true;
+
−                ty:= y * 32;
+
−                tx:= x * 32;
+
−                while(resweep) do
+
−                    begin
+
−                    resweep:= false;
+
−                    for yy:= ty to ty + 31 do
+
−                        for xx:= tx to tx + 31 do
+
−                            if Despeckle(xx, yy) then
+
−                                begin
+
−                                bRes:= true;
+
−                                updateBlock:= true;
+
−                                resweep:= true;
+
−                                if (yy = ty) and (y > 0) then
+
−                                    begin
+
−                                    LandDirty[y-1, x]:= 1;
+
−                                    recheck:= true;
+
−                                    end
+
−                                else if (yy = ty+31) and (y < LAND_HEIGHT div 32 - 1) then
+
−                                    begin
+
−                                    LandDirty[y+1, x]:= 1;
+
−                                    recheck:= true;
+
−                                    end;
+
−                                if (xx = tx) and (x > 0) then
+
−                                    begin
+
−                                    LandDirty[y, x-1]:= 1;
+
−                                    recheck:= true;
+
−                                    end
+
−                                else if (xx = tx+31) and (x < LAND_WIDTH div 32 - 1) then
+
−                                    begin
+
−                                    LandDirty[y, x+1]:= 1;
+
−                                    recheck:= true;
+
−                                    end
+
−                                end;
+
−                    end;
+
−                if updateBlock then
+
−                    UpdateLandTexture(tx, 32, ty, 32, false);
+
−                LandDirty[y, x]:= 2;
+
−                end;
+
−            end;
+
−        end;
+
−     end;
+
−
+
−for y:= 0 to LAND_HEIGHT div 32 - 1 do
+
−    for x:= 0 to LAND_WIDTH div 32 - 1 do
+
−        if LandDirty[y, x] <> 0 then
+
−            begin
+
−            LandDirty[y, x]:= 0;
+
−            ty:= y * 32;
+
−            tx:= x * 32;
+
−            for yy:= ty to ty + 31 do
+
−                for xx:= tx to tx + 31 do
+
−                    Smooth(xx,yy)
+
−            end;
+
−
+
−SweepDirty:= bRes;
+
−end;
+
−
+
−
+
−// Return true if outside of land or not the value tested, used right now for some X/Y movement that does not use normal hedgehog movement in GSHandlers.inc
+
−function CheckLandValue(X, Y: LongInt; LandFlag: Word): boolean; inline;
+
−begin
+
−    CheckLandValue:= ((X and LAND_WIDTH_MASK <> 0) or (Y and LAND_HEIGHT_MASK <> 0)) or ((Land[Y, X] and LandFlag) = 0)
+
−end;
+
−
+
−function LandBackPixel(x, y: LongInt): LongWord; inline;
+
−var p: PLongWordArray;
+
−begin
+
−    if LandBackSurface = nil then
+
−        LandBackPixel:= 0
+
−    else
+
−        begin
+
−        p:= LandBackSurface^.pixels;
+
−        LandBackPixel:= p^[LandBackSurface^.w * (y mod LandBackSurface^.h) + (x mod LandBackSurface^.w)];// or $FF000000;
+
−        end
+
−end;
+
−
+
−
+
−procedure DrawLine(X1, Y1, X2, Y2: LongInt; Color: Longword);
+
−var
+
−  eX, eY, dX, dY: LongInt;
+
−  i, sX, sY, x, y, d: LongInt;
+
−begin
+
−eX:= 0;
+
−eY:= 0;
+
−dX:= X2 - X1;
+
−dY:= Y2 - Y1;
+
−
+
−if (dX > 0) then
+
−    sX:= 1
+
−else
+
−    if (dX < 0) then
+
−        begin
+
−        sX:= -1;
+
−        dX:= -dX
+
−        end
+
−    else
+
−        sX:= dX;
+
−
+
−if (dY > 0) then
+
−    sY:= 1
+
−else
+
−    if (dY < 0) then
+
−        begin
+
−        sY:= -1;
+
−        dY:= -dY
+
−        end
+
−    else
+
−        sY:= dY;
+
−
+
−if (dX > dY) then
+
−    d:= dX
+
−else
+
−    d:= dY;
+
−
+
−x:= X1;
+
−y:= Y1;
+
−
+
−for i:= 0 to d do
+
−    begin
+
−    inc(eX, dX);
+
−    inc(eY, dY);
+
−    if (eX > d) then
+
−        begin
+
−        dec(eX, d);
+
−        inc(x, sX);
+
−        end;
+
−    if (eY > d) then
+
−        begin
+
−        dec(eY, d);
+
−        inc(y, sY);
+
−        end;
+
−
+
−    if ((x and LAND_WIDTH_MASK) = 0) and ((y and LAND_HEIGHT_MASK) = 0) then
+
−        Land[y, x]:= Color;
+
−    end
+
−end;
+
−
+
−procedure DrawDots(x, y, xx, yy: Longint; Color: Longword); inline;
+
−begin
+
−    if (((x + xx) and LAND_WIDTH_MASK) = 0) and (((y + yy) and LAND_HEIGHT_MASK) = 0) then Land[y + yy, x + xx]:= Color;
+
−    if (((x + xx) and LAND_WIDTH_MASK) = 0) and (((y - yy) and LAND_HEIGHT_MASK) = 0) then Land[y - yy, x + xx]:= Color;
+
−    if (((x - xx) and LAND_WIDTH_MASK) = 0) and (((y + yy) and LAND_HEIGHT_MASK) = 0) then Land[y + yy, x - xx]:= Color;
+
−    if (((x - xx) and LAND_WIDTH_MASK) = 0) and (((y - yy) and LAND_HEIGHT_MASK) = 0) then Land[y - yy, x - xx]:= Color;
+
−    if (((x + yy) and LAND_WIDTH_MASK) = 0) and (((y + xx) and LAND_HEIGHT_MASK) = 0) then Land[y + xx, x + yy]:= Color;
+
−    if (((x + yy) and LAND_WIDTH_MASK) = 0) and (((y - xx) and LAND_HEIGHT_MASK) = 0) then Land[y - xx, x + yy]:= Color;
+
−    if (((x - yy) and LAND_WIDTH_MASK) = 0) and (((y + xx) and LAND_HEIGHT_MASK) = 0) then Land[y + xx, x - yy]:= Color;
+
−    if (((x - yy) and LAND_WIDTH_MASK) = 0) and (((y - xx) and LAND_HEIGHT_MASK) = 0) then Land[y - xx, x - yy]:= Color;
+
−end;
+
−
+
−procedure DrawLines(X1, Y1, X2, Y2, XX, YY: LongInt; color: Longword);
+
−var
+
−  eX, eY, dX, dY: LongInt;
+
−  i, sX, sY, x, y, d: LongInt;
+
−  f: boolean;
+
−begin
+
−    eX:= 0;
+
−    eY:= 0;
+
−    dX:= X2 - X1;
+
−    dY:= Y2 - Y1;
+
−
+
−    if (dX > 0) then
+
−        sX:= 1
+
−    else
+
−        if (dX < 0) then
+
−            begin
+
−            sX:= -1;
+
−            dX:= -dX
+
−            end
+
−        else
+
−            sX:= dX;
+
−
+
−    if (dY > 0) then
+
−        sY:= 1
+
−    else
+
−        if (dY < 0) then
+
−            begin
+
−            sY:= -1;
+
−            dY:= -dY
+
−            end
+
−        else
+
−            sY:= dY;
+
−
+
−    if (dX > dY) then
+
−        d:= dX
+
−    else
+
−        d:= dY;
+
−
+
−    x:= X1;
+
−    y:= Y1;
+
−
+
−    for i:= 0 to d do
+
−        begin
+
−        inc(eX, dX);
+
−        inc(eY, dY);
+
−
+
−        f:= eX > d;
+
−        if f then
+
−            begin
+
−            dec(eX, d);
+
−            inc(x, sX);
+
−            DrawDots(x, y, xx, yy, color)
+
−            end;
+
−        if (eY > d) then
+
−            begin
+
−            dec(eY, d);
+
−            inc(y, sY);
+
−            f:= true;
+
−            DrawDots(x, y, xx, yy, color)
+
−            end;
+
−
+
−        if not f then
+
−            DrawDots(x, y, xx, yy, color)
+
−        end
+
−end;
+
−
+
−procedure DrawThickLine(X1, Y1, X2, Y2, radius: LongInt; color: Longword);
+
−var dx, dy, d: LongInt;
+
−begin
+
−    dx:= 0;
+
−    dy:= Radius;
+
−    d:= 3 - 2 * Radius;
+
−    while (dx < dy) do
+
−        begin
+
−        DrawLines(x1, y1, x2, y2, dx, dy, color);
+
−        if (d < 0) then
+
−            d:= d + 4 * dx + 6
+
−        else
+
−            begin
+
−            d:= d + 4 * (dx - dy) + 10;
+
−            dec(dy)
+
−            end;
+
−        inc(dx)
+
−        end;
+
−    if (dx = dy) then
+
−        DrawLines(x1, y1, x2, y2, dx, dy, color);
+
−end;
+
−
+
−
+
−procedure DumpLandToLog(x, y, r: LongInt);
+
−var xx, yy, dx: LongInt;
+
−    s: shortstring;
+
−begin
+
−    s[0]:= char(r * 2 + 1);
+
−    for yy:= y - r to y + r do
+
−        begin
+
−        for dx:= 0 to r*2 do
+
−            begin
+
−            xx:= dx - r + x;
+
−            if (xx = x) and (yy = y) then
+
−                s[dx + 1]:= 'X'
+
−            else if Land[yy, xx] > 255 then
+
−                s[dx + 1]:= 'O'
+
−            else if Land[yy, xx] > 0 then
+
−                s[dx + 1]:= '*'
+
−            else
+
−                s[dx + 1]:= '.'
+
−            end;
+
−        AddFileLog('Land dump: ' + s);
+
−        end;
+
−end;
+
−
+
−end.