(*

 * Hedgewars, a free turn based strategy game

 * Copyright (c) 2004-2015 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

 *)

{$INCLUDE "options.inc"}

unit uRenderUtils;

interface

uses SDLh, uTypes;

procedure flipSurface(Surface: PSDL_Surface; Vertical: Boolean);

procedure copyRotatedSurface(src, dest: PSDL_Surface); // this is necessary since width/height are read only in SDL

procedure copyToXY(src, dest: PSDL_Surface; destX, destY: LongInt); inline;

procedure copyToXYFromRect(src, dest: PSDL_Surface; srcX, srcY, srcW, srcH, destX, destY: LongInt);

procedure DrawSprite2Surf(sprite: TSprite; dest: PSDL_Surface; x,y: LongInt); inline;

procedure DrawSpriteFrame2Surf(sprite: TSprite; dest: PSDL_Surface; x,y: LongInt; frame: LongInt);

procedure DrawLine2Surf(dest: PSDL_Surface; x0,y0,x1,y1:LongInt; r,g,b: byte);

procedure DrawRoundRect(rect: PSDL_Rect; BorderColor, FillColor: Longword; Surface: PSDL_Surface; Clear: boolean);

function  RenderStringTex(s: ansistring; Color: Longword; font: THWFont): PTexture;

function  RenderStringTexLim(s: ansistring; Color: Longword; font: THWFont; maxLength: LongWord): PTexture;

function  RenderSpeechBubbleTex(s: ansistring; SpeechType: Longword; font: THWFont): PTexture;

function IsTooDarkToRead(TextColor: Longword): boolean; inline;

implementation

uses uVariables, uConsts, uTextures, SysUtils, uUtils, uDebug;

procedure DrawRoundRect(rect: PSDL_Rect; BorderColor, FillColor: Longword; Surface: PSDL_Surface; Clear: boolean);

var r: TSDL_Rect;

begin

    r:= rect^;

    if Clear then

        SDL_FillRect(Surface, @r, SDL_MapRGBA(Surface^.format, 0, 0, 0, 0));

    BorderColor:= SDL_MapRGB(Surface^.format, BorderColor shr 16, BorderColor shr 8, BorderColor and $FF);

    FillColor:= SDL_MapRGB(Surface^.format, FillColor shr 16, FillColor shr 8, FillColor and $FF);

    r.y:= rect^.y + cFontBorder div 2;

    r.h:= rect^.h - cFontBorder;

    SDL_FillRect(Surface, @r, BorderColor);

    r.x:= rect^.x + cFontBorder div 2;

    r.w:= rect^.w - cFontBorder;

    r.y:= rect^.y;

    r.h:= rect^.h;

    SDL_FillRect(Surface, @r, BorderColor);

    r.x:= rect^.x + cFontBorder;

    r.y:= rect^.y + cFontBorder div 2;

    r.w:= rect^.w - cFontBorder * 2;

    r.h:= rect^.h - cFontBorder;

    SDL_FillRect(Surface, @r, FillColor);

    r.x:= rect^.x + cFontBorder div 2;

    r.y:= rect^.y + cFontBorder;

    r.w:= rect^.w - cFontBorder;

    r.h:= rect^.h - cFontBorder * 2;

    SDL_FillRect(Surface, @r, FillColor);

end;

(*

function WriteInRoundRect(Surface: PSDL_Surface; X, Y: LongInt; Color: LongWord; Font: THWFont; s: ansistring): TSDL_Rect;

begin

    WriteInRoundRect:= WriteInRoundRect(Surface, X, Y, Color, Font, s, 0);

end;*)

function IsTooDarkToRead(TextColor: LongWord): boolean; inline;

var clr: TSDL_Color;

begin

    clr.r:= (TextColor shr 16) and $FF;

    clr.g:= (TextColor shr 8) and $FF;

    clr.b:= TextColor and $FF;

    IsTooDarkToRead:= not ((clr.r >= cInvertTextColorAt) or (clr.g >= cInvertTextColorAt) or (clr.b >= cInvertTextColorAt));

end;

function WriteInRoundRect(Surface: PSDL_Surface; X, Y: LongInt; Color: LongWord; Font: THWFont; s: ansistring; maxLength: LongWord): TSDL_Rect;

var w, h: Longword;

    tmpsurf: PSDL_Surface;

    finalRect, textRect: TSDL_Rect;

    clr: TSDL_Color;

begin

    TTF_SizeUTF8(Fontz[Font].Handle, PChar(s), @w, @h);

    if (maxLength > 0) and (w > maxLength * HDPIScaleFactor) then w := maxLength * HDPIScaleFactor;

    finalRect.x:= X;

    finalRect.y:= Y;

    finalRect.w:= w + cFontBorder * 2 + cFontPadding * 2;

    finalRect.h:= h + cFontBorder * 2;

    textRect.x:= X;

    textRect.y:= Y;

    textRect.w:= w;

    textRect.h:= h;

    clr.r:= (Color shr 16) and $FF;

    clr.g:= (Color shr 8) and $FF;

    clr.b:= Color and $FF;

    clr.a:= $FF;

    if (not IsTooDarkToRead(Color)) then

        DrawRoundRect(@finalRect, cWhiteColor, cNearBlackColor, Surface, true)

    else

        DrawRoundRect(@finalRect, cNearBlackColor, cWhiteColor, Surface, true);

    tmpsurf:= TTF_RenderUTF8_Blended(Fontz[Font].Handle, PChar(s), clr);

    finalRect.x:= X + cFontBorder + cFontPadding;

    finalRect.y:= Y + cFontBorder;

    if SDLCheck(tmpsurf <> nil, 'TTF_RenderUTF8_Blended', true) then

        exit;

    SDL_UpperBlit(tmpsurf, @textRect, Surface, @finalRect);

    SDL_FreeSurface(tmpsurf);

    finalRect.x:= X;

    finalRect.y:= Y;

    finalRect.w:= w + cFontBorder * 2 + cFontPadding * 2;

    finalRect.h:= h + cFontBorder * 2;

    WriteInRoundRect:= finalRect;

end;

procedure flipSurface(Surface: PSDL_Surface; Vertical: Boolean);

var y, x, i, j: LongInt;

    tmpPixel: Longword;

    pixels: PLongWordArray;

begin

    if checkFails(Surface^.format^.BytesPerPixel = 4, 'flipSurface failed, expecting 32 bit surface', true) then

        exit;

    SDL_LockSurface(Surface);

    pixels:= Surface^.pixels;

    if Vertical then

    for y := 0 to (Surface^.h div 2) - 1 do

        for x := 0 to Surface^.w - 1 do

            begin

            i:= y * Surface^.w + x;

            j:= (Surface^.h - y - 1) * Surface^.w + x;

            tmpPixel:= pixels^[i];

            pixels^[i]:= pixels^[j];

            pixels^[j]:= tmpPixel;

            end

    else

    for x := 0 to (Surface^.w div 2) - 1 do

        for y := 0 to Surface^.h - 1 do

            begin

            i:= y*Surface^.w + x;

            j:= y*Surface^.w + (Surface^.w - x - 1);

            tmpPixel:= pixels^[i];

            pixels^[i]:= pixels^[j];

            pixels^[j]:= tmpPixel;

            end;

    SDL_UnlockSurface(Surface);

end;

procedure copyToXY(src, dest: PSDL_Surface; destX, destY: LongInt); inline;

begin

    // copy from complete src

    copyToXYFromRect(src, dest, 0, 0, src^.w, src^.h, destX, destY);

end;

procedure copyToXYFromRect(src, dest: PSDL_Surface; srcX, srcY, srcW, srcH, destX, destY: LongInt);

var spi, dpi, iX, iY, dX, dY, lX, lY, aT: LongInt;

    srcPixels, destPixels: PLongWordArray;

    rD, gD, bD, aD, rT, gT, bT: Byte;

begin

    SDL_LockSurface(src);

    SDL_LockSurface(dest);

    srcPixels:= src^.pixels;

    destPixels:= dest^.pixels;

    // what's the offset between src and dest coords?

    dX:= destX - srcX;

    dY:= destY - srcY;

    // let's figure out where the rectangle we can actually copy ends

    lX:= min(srcX + srcW, src^.w) - 1;

    if lX + dx >= dest^.w then lX:= dest^.w - dx - 1;

    lY:= min(srcY + srcH, src^.h) - 1;

    if lY + dy >= dest^.h then lY:= dest^.h - dy - 1;

    for iX:= srcX to lX do

    for iY:= srcY to lY do

        begin

        // src pixel index

        spi:= iY * src^.w  + iX;

        // dest pixel index

        dpi:= (iY + dY) * dest^.w + (iX + dX);

        // get src alpha (and set it as target alpha for now)

        aT:= (srcPixels^[spi] and AMask) shr AShift;

        // src pixel opaque?

        if aT = 255 then

            begin

            // just copy full pixel

            destPixels^[dpi]:= srcPixels^[spi];

            continue;

            end;

        // get dst alpha (without shift for now)

        aD:= (destPixels^[dpi] and AMask) shr AShift;

        // dest completely transparent?

        if aD = 0 then

            begin

            // just copy src pixel

            destPixels^[dpi]:= srcPixels^[spi];

            continue;

            end;

        // looks like some blending is necessary

        // set color of target RGB to src for now

        SDL_GetRGB(srcPixels^[spi],  src^.format,  @rT, @gT, @bT);

        SDL_GetRGB(destPixels^[dpi], dest^.format, @rD, @gD, @bD);

        // note: this is not how to correctly blend RGB, just sayin' (R,G,B are not linear...)

        rT:= (rD * (255 - aT) + rT * aT) div 255;

        gT:= (gD * (255 - aT) + gT * aT) div 255;

        bT:= (bD * (255 - aT) + bT * aT) div 255;

        aT:= aD + ((255 - LongInt(aD)) * aT div 255);

        destPixels^[dpi]:= SDL_MapRGBA(dest^.format, rT, gT, bT, Byte(aT));

        end;

    SDL_UnlockSurface(src);

    SDL_UnlockSurface(dest);

end;

procedure DrawSprite2Surf(sprite: TSprite; dest: PSDL_Surface; x,y: LongInt); inline;

begin

   DrawSpriteFrame2Surf(sprite, dest, x, y, 0);

end;

procedure DrawSpriteFrame2Surf(sprite: TSprite; dest: PSDL_Surface; x,y,frame: LongInt);

var numFramesFirstCol, row, col: LongInt;

begin

    numFramesFirstCol:= SpritesData[sprite].imageHeight div SpritesData[sprite].Height;

    row:= Frame mod numFramesFirstCol;

    col:= Frame div numFramesFirstCol;

    copyToXYFromRect(SpritesData[sprite].Surface, dest,

             col*SpritesData[sprite].Width,

             row*SpritesData[sprite].Height,

             SpritesData[sprite].Width,

             spritesData[sprite].Height,

             x,y);

end;

procedure DrawLine2Surf(dest: PSDL_Surface; x0, y0,x1,y1: LongInt; r,g,b: byte);

var

    dx,dy,err,e2,sx,sy: LongInt;

    yMax: LongInt;

    destPixels: PLongwordArray;

begin

    //max:= (dest^.pitch div 4) * dest^.h;

    yMax:= dest^.pitch div 4;

    SDL_LockSurface(dest);

    destPixels:= dest^.pixels;

    dx:= abs(x1-x0);

    dy:= abs(y1-y0);

    if x0 < x1 then sx:= 1 else sx:= -1;

    if y0 < y1 then sy:= 1 else sy:= -1;

    err:= dx-dy;

    while(true) do

        begin

        destPixels^[(y0 * yMax) + x0]:= SDL_MapRGB(dest^.format, r,g,b); //But will it blend? no

        if (x0 = x1) and (y0 = y1) then break;

        e2:= 2*err;

        if e2 > -dy then

            begin

            err:= err - dy;

            x0 := x0 + sx;

            end;

        if e2 < dx then

            begin

            err:= err + dx;

            y0:=y0+sy

            end;

        end;

    SDL_UnlockSurface(dest);

end;

procedure copyRotatedSurface(src, dest: PSDL_Surface); // this is necessary since width/height are read only in SDL, apparently

var y, x, i, j: LongInt;

    srcPixels, destPixels: PLongWordArray;

begin

    checkFails(src^.format^.BytesPerPixel = 4, 'rotateSurface failed, expecting 32 bit surface', true);

    checkFails(dest^.format^.BytesPerPixel = 4, 'rotateSurface failed, expecting 32 bit surface', true);

    if not allOK then exit;

    SDL_LockSurface(src);

    SDL_LockSurface(dest);

    srcPixels:= src^.pixels;

    destPixels:= dest^.pixels;

    j:= 0;

    for x := 0 to src^.w - 1 do

        for y := 0 to src^.h - 1 do

            begin

            i:= (src^.h - 1 - y) * (src^.pitch div 4) + x;

            destPixels^[j]:= srcPixels^[i];

            inc(j)

            end;

    SDL_UnlockSurface(src);

    SDL_UnlockSurface(dest);

end;

function RenderStringTex(s: ansistring; Color: Longword; font: THWFont): PTexture;

begin

    RenderStringTex:= RenderStringTexLim(s, Color, font, 0);

end;

function RenderStringTexLim(s: ansistring; Color: Longword; font: THWFont; maxLength: LongWord): PTexture;

var w, h: Longword;

    finalSurface: PSDL_Surface;

begin

    if cOnlyStats then

        begin

        RenderStringTexLim:= nil;

        end

    else

        begin

        if length(s) = 0 then s:= _S' ';

        font:= CheckCJKFont(s, font);

        w:= 0; h:= 0; // avoid compiler hints

        TTF_SizeUTF8(Fontz[font].Handle, PChar(s), @w, @h);

        if (maxLength > 0) and (w > maxLength * HDPIScaleFactor) then w := maxLength * HDPIScaleFactor;

        finalSurface:= SDL_CreateRGBSurface(SDL_SWSURFACE, w + cFontBorder*2 + cFontPadding*2, h + cFontBorder * 2,

                32, RMask, GMask, BMask, AMask);

        if checkFails(finalSurface <> nil, 'RenderString: fail to create surface', true) then

            exit(nil);

        WriteInRoundRect(finalSurface, 0, 0, Color, font, s, maxLength);

        checkFails(SDL_SetColorKey(finalSurface, SDL_TRUE, 0) = 0, errmsgTransparentSet, false);

        RenderStringTexLim:= Surface2Tex(finalSurface, false);

        SDL_FreeSurface(finalSurface);

        end;

end;

function GetNextSpeechLine(s: ansistring; ldelim: char; var startFrom: LongInt; out substr: ansistring): boolean;

var p, l, m, r: Integer;

    newl, skip: boolean;

    c         : char;

begin

    m:= Length(s);

    substr:= '';

    SetLengthA(substr, m);

    // number of chars read

    r:= 0;

    // number of chars to be written

    l:= 0;

    newl:= true;

    for p:= max(1, startFrom) to m do

        begin

        inc(r);

        // read char from source string

        c:= s[p];

        // strip empty lines, spaces and newlines on beginnings of line

        skip:= ((newl or (p = m)) and ((c = ' ') or (c = ldelim)));

        if (not skip) then

            begin

            newl:= (c = ldelim);

            // stop if we went past the end of the line

            if newl then

                break;

            // copy current char to output substring

            inc(l);

            substr[l]:= c;

            end;

        end;

    inc(startFrom, r);

    SetLengthA(substr, l);

    GetNextSpeechLine:= (l > 0);

end;

function RenderSpeechBubbleTex(s: ansistring; SpeechType: Longword; font: THWFont): PTexture;

var textWidth, textHeight, x, y, w, h, i, j, pos, line, numLines, edgeWidth, edgeHeight, cornerWidth, cornerHeight: LongInt;

    finalSurface, tmpsurf, rotatedEdge: PSDL_Surface;

    rect: TSDL_Rect;

    {$IFNDEF PAS2C}

    breakChars: set of char = [#9,' ','-'];

    {$ENDIF}

    substr: ansistring;

    edge, corner, tail: TSPrite;

begin

    if cOnlyStats then exit(nil);

    case SpeechType of

        1: begin

            edge:= sprSpeechEdge;

            corner:= sprSpeechCorner;

            tail:= sprSpeechTail;

            end;

        2: begin

            edge:= sprThoughtEdge;

            corner:= sprThoughtCorner;

            tail:= sprThoughtTail;

            end;

        3: begin

            edge:= sprShoutEdge;

            corner:= sprShoutCorner;

            tail:= sprShoutTail;

            end

        else

            exit(nil)

        end;

    edgeHeight:= SpritesData[edge].Height;

    edgeWidth:= SpritesData[edge].Width;

    cornerWidth:= SpritesData[corner].Width;

    cornerHeight:= SpritesData[corner].Height;

    // This one screws up WrapText

    //s:= 'This is the song that never ends.  ''cause it goes on and on my friends. Some people, started singing it not knowing what it was. And they''ll just go on singing it forever just because... This is the song that never ends...';

    // This one does not

    //s:= 'This is the song that never ends.  cause it goes on and on my friends. Some people, started singing it not knowing what it was. And they will go on singing it forever just because... This is the song that never ends... ';

    numLines:= 0;

    if length(s) = 0 then

        s:= '...';

    font:= CheckCJKFont(s, font);

    w:= 0; h:= 0; // avoid compiler hints

    TTF_SizeUTF8(Fontz[font].Handle, PChar(s), @w, @h);

    if w<8 then

        w:= 8;

    j:= 0;

    if (length(s) > 20) then

        begin

        w:= 0;

        i:= round(Sqrt(length(s)) * 2);

        {$IFNDEF PAS2C}

        s:= WrapText(s, #1, breakChars, i);

        {$ENDIF}

        pos:= 1; line:= 0;

    // Find the longest line for the purposes of centring the text.  Font dependant.

        while GetNextSpeechLine(s, #1, pos, substr) do

            begin

            inc(numLines);

            i:= 0; j:= 0;

            TTF_SizeUTF8(Fontz[font].Handle, PChar(substr), @i, @j);

            if i > w then

                w:= i;

            end;

        end

    else numLines := 1;

    if numLines < 1 then

        begin

        s:= '...';

        numLines:= 1;

        end;

    textWidth:=((w-(cornerWidth-edgeWidth)*2) div edgeWidth)*edgeWidth+edgeWidth;

    textHeight:=(((numlines * h + 2)-((cornerHeight-edgeWidth)*2)) div edgeWidth)*edgeWidth;

    textHeight:=max(textHeight,edgeWidth);

    //textWidth:=max(textWidth,SpritesData[tail].Width);