{*******************************************************}
{                                                       }
{         Delphi VCL Extensions (RX)                    }
{                                                       }
{         Copyright (c) 1995, 1996 AO ROSNO             }
{         Copyright (c) 1997, 1998 Master-Bank          }
{                                                       }
{*******************************************************}

unit ZVclUtils;

{$P+,W-,R-,V-}

interface

uses Windows, Classes, Graphics, Forms, Controls, Dialogs;

procedure StretchBitmapRectTransparent(Dest: TCanvas; DstX, DstY, DstW,
  DstH: Integer; SrcRect: TRect; Bitmap: TBitmap; TransparentColor: TColor);

procedure NotImplemented;
function  PaletteColor(Color: TColor): Longint;
procedure Delay(MSecs: Longint);

function  AllocMemo(Size: Longint): Pointer;
procedure FreeMemo(var fpBlock: Pointer);
function  HugeOffset(HugePtr: Pointer; Amount: Longint): Pointer;

procedure HMemCpy(DstPtr, SrcPtr: Pointer; Amount: Longint);

{ Standard Windows colors that are not defined by Delphi }

const
  clCream      = TColor($A6CAF0);
  clMoneyGreen = TColor($C0DCC0);
  clSkyBlue    = TColor($FFFBF0);

{ Cursor routines }

const
  WaitCursor: TCursor = crHourGlass;

procedure StartWait(NewCursor: TCursor);
procedure StopWait;
function DefineCursor(Instance: THandle; ResID: PChar): TCursor;

{ Windows API level routines }

procedure StretchBltTransparent(DstDC: HDC; DstX, DstY, DstW, DstH: Integer;
  SrcDC: HDC; SrcX, SrcY, SrcW, SrcH: Integer; Palette: HPalette;
  TransparentColor: TColorRef);

function PaletteEntries(Palette: HPALETTE): Integer;

type
  TCustomForm = TForm;
  TDate = TDateTime;
  TTime = TDateTime;

function ResStr(Ident: Cardinal): string;

implementation

uses SysUtils, Messages, Math, Consts, ZCommonConst,
  {$IFNDEF VER100}SysConst,{$ENDIF} CommCtrl;

{ Exceptions }

procedure ResourceNotFound(ResID: PChar);
var 
  S: string;
begin
  if LongRec(ResID).Hi = 0 then 
    S := IntToStr(LongRec(ResID).Lo)
  else 
    S := StrPas(ResID);
  raise EResNotFound.CreateFmt(ResStr(SResNotFound), [S]);
end;

{ Transparent bitmap }

procedure StretchBltTransparent(DstDC: HDC; DstX, DstY, DstW, DstH: Integer;
  SrcDC: HDC; SrcX, SrcY, SrcW, SrcH: Integer; Palette: HPalette;
  TransparentColor: TColorRef);
var
  Color: TColorRef;
  bmAndBack, bmAndObject, bmAndMem, bmSave: HBitmap;
  bmBackOld, bmObjectOld, bmMemOld, bmSaveOld: HBitmap;
  MemDC, BackDC, ObjectDC, SaveDC: HDC;
  palDst, palMem, palSave, palObj: HPalette;
begin
  { Create some DCs to hold temporary data }
  BackDC   := CreateCompatibleDC(DstDC);
  ObjectDC := CreateCompatibleDC(DstDC);
  MemDC    := CreateCompatibleDC(DstDC);
  SaveDC   := CreateCompatibleDC(DstDC);
  { Create a bitmap for each DC }
  bmAndObject := CreateBitmap(SrcW, SrcH, 1, 1, nil);
  bmAndBack   := CreateBitmap(SrcW, SrcH, 1, 1, nil);
  bmAndMem    := CreateCompatibleBitmap(DstDC, DstW, DstH);
  bmSave      := CreateCompatibleBitmap(DstDC, SrcW, SrcH);
  { Each DC must select a bitmap object to store pixel data }
  bmBackOld   := SelectObject(BackDC, bmAndBack);
  bmObjectOld := SelectObject(ObjectDC, bmAndObject);
  bmMemOld    := SelectObject(MemDC, bmAndMem);
  bmSaveOld   := SelectObject(SaveDC, bmSave);
  { Select palette }
  palDst := 0; 
  palMem := 0; 
  palSave := 0; 
  palObj := 0;
  if Palette <> 0 then begin
    palDst := SelectPalette(DstDC, Palette, True);
    RealizePalette(DstDC);
    palSave := SelectPalette(SaveDC, Palette, False);
    RealizePalette(SaveDC);
    palObj := SelectPalette(ObjectDC, Palette, False);
    RealizePalette(ObjectDC);
    palMem := SelectPalette(MemDC, Palette, True);
    RealizePalette(MemDC);
  end;
  { Set proper mapping mode }
  SetMapMode(SrcDC, GetMapMode(DstDC));
  SetMapMode(SaveDC, GetMapMode(DstDC));
  { Save the bitmap sent here }
  BitBlt(SaveDC, 0, 0, SrcW, SrcH, SrcDC, SrcX, SrcY, SRCCOPY);
  { Set the background color of the source DC to the color,         }
  { contained in the parts of the bitmap that should be transparent }
  Color := SetBkColor(SaveDC, PaletteColor(TransparentColor));
  { Create the object mask for the bitmap by performing a BitBlt()  }
  { from the source bitmap to a monochrome bitmap                   }
  BitBlt(ObjectDC, 0, 0, SrcW, SrcH, SaveDC, 0, 0, SRCCOPY);
  { Set the background color of the source DC back to the original  }
  SetBkColor(SaveDC, Color);
  { Create the inverse of the object mask }
  BitBlt(BackDC, 0, 0, SrcW, SrcH, ObjectDC, 0, 0, NOTSRCCOPY);
  { Copy the background of the main DC to the destination }
  BitBlt(MemDC, 0, 0, DstW, DstH, DstDC, DstX, DstY, SRCCOPY);
  { Mask out the places where the bitmap will be placed }
  StretchBlt(MemDC, 0, 0, DstW, DstH, ObjectDC, 0, 0, SrcW, SrcH, SRCAND);
  { Mask out the transparent colored pixels on the bitmap }
  BitBlt(SaveDC, 0, 0, SrcW, SrcH, BackDC, 0, 0, SRCAND);
  { XOR the bitmap with the background on the destination DC }
  StretchBlt(MemDC, 0, 0, DstW, DstH, SaveDC, 0, 0, SrcW, SrcH, SRCPAINT);
  { Copy the destination to the screen }
  BitBlt(DstDC, DstX, DstY, DstW, DstH, MemDC, 0, 0, SRCCOPY);
  { Restore palette }
  if Palette <> 0 then
  begin
    SelectPalette(MemDC, palMem, False);
    SelectPalette(ObjectDC, palObj, False);
    SelectPalette(SaveDC, palSave, False);
    SelectPalette(DstDC, palDst, True);
  end;
  { Delete the memory bitmaps }
  DeleteObject(SelectObject(BackDC, bmBackOld));
  DeleteObject(SelectObject(ObjectDC, bmObjectOld));
  DeleteObject(SelectObject(MemDC, bmMemOld));
  DeleteObject(SelectObject(SaveDC, bmSaveOld));
  { Delete the memory DCs }
  DeleteDC(MemDC);
  DeleteDC(BackDC);
  DeleteDC(ObjectDC);
  DeleteDC(SaveDC);
end;

procedure StretchBitmapTransparent(Dest: TCanvas; Bitmap: TBitmap;
  TransparentColor: TColor; DstX, DstY, DstW, DstH, SrcX, SrcY,
  SrcW, SrcH: Integer);
var
  CanvasChanging: TNotifyEvent;
begin
  if DstW <= 0 then DstW := Bitmap.Width;
  if DstH <= 0 then DstH := Bitmap.Height;
  if (SrcW <= 0) or (SrcH <= 0) then
  begin
    SrcX := 0; SrcY := 0;
    SrcW := Bitmap.Width;
    SrcH := Bitmap.Height;
  end;
  if not Bitmap.Monochrome then
    SetStretchBltMode(Dest.Handle, STRETCH_DELETESCANS);
  CanvasChanging := Bitmap.Canvas.OnChanging;
  Bitmap.Canvas.Lock;
  try
    Bitmap.Canvas.OnChanging := nil;
    if TransparentColor = clNone then
    begin
      StretchBlt(Dest.Handle, DstX, DstY, DstW, DstH, Bitmap.Canvas.Handle,
        SrcX, SrcY, SrcW, SrcH, Dest.CopyMode);
    end
    else begin
      if TransparentColor = clDefault then
        TransparentColor := Bitmap.Canvas.Pixels[0, Bitmap.Height - 1];
      if Bitmap.Monochrome then
        TransparentColor := clWhite
      else
        TransparentColor := ColorToRGB(TransparentColor);
      StretchBltTransparent(Dest.Handle, DstX, DstY, DstW, DstH,
        Bitmap.Canvas.Handle, SrcX, SrcY, SrcW, SrcH, Bitmap.Palette, TransparentColor);
    end;
  finally
    Bitmap.Canvas.OnChanging := CanvasChanging;
    Bitmap.Canvas.Unlock;
  end;
end;

procedure StretchBitmapRectTransparent(Dest: TCanvas; DstX, DstY,
  DstW, DstH: Integer; SrcRect: TRect; Bitmap: TBitmap;
  TransparentColor: TColor);
begin
  with SrcRect do
    StretchBitmapTransparent(Dest, Bitmap, TransparentColor,
      DstX, DstY, DstW, DstH, Left, Top, Right - Left, Bottom - Top);
end;

procedure NotImplemented;
begin
  Screen.Cursor := crDefault;
  MessageDlg(LoadStr(SNotImplemented), mtInformation, [mbOk], 0);
  Abort;
end;

function PaletteColor(Color: TColor): Longint;
begin
  Result := ColorToRGB(Color) or PaletteMask;
end;

procedure Delay(MSecs: Longint);
var
  FirstTickCount, Now: Longint;
begin
  FirstTickCount := GetTickCount;
  repeat
    Application.ProcessMessages;
    { allowing access to other controls, etc. }
    Now := GetTickCount;
  until (Now - FirstTickCount >= MSecs) or (Now < FirstTickCount);
end;

function PaletteEntries(Palette: HPALETTE): Integer;
begin
  GetObject(Palette, SizeOf(Integer), @Result);
end;

{ Memory routines }

function AllocMemo(Size: Longint): Pointer;
begin
  if Size > 0 then
    Result := GlobalAllocPtr(HeapAllocFlags or GMEM_ZEROINIT, Size)
  else
    Result := nil;
end;

procedure FreeMemo(var fpBlock: Pointer);
begin
  if fpBlock <> nil then
  begin
    GlobalFreePtr(fpBlock);
    fpBlock := nil;
  end;
end;

function HugeOffset(HugePtr: Pointer; Amount: Longint): Pointer;
begin
  Result := PChar(HugePtr) + Amount;
end;

procedure HMemCpy(DstPtr, SrcPtr: Pointer; Amount: Longint);
begin
  Move(SrcPtr^, DstPtr^, Amount);
end;

function DefineCursor(Instance: THandle; ResID: PChar): TCursor;
var
  Handle: HCursor;
begin
  Handle := LoadCursor(Instance, ResID);
  if Handle = 0 then ResourceNotFound(ResID);
  for Result := 100 to High(TCursor) do { Look for an unassigned cursor index }
    if (Screen.Cursors[Result] = Screen.Cursors[crDefault]) then
    begin
      Screen.Cursors[Result] := Handle;
      Exit;
    end;
  DestroyCursor(Handle);
  raise EOutOfResources.Create(ResStr(SOutOfResources));
end;

const
  WaitCount: Integer = 0;
  SaveCursor: TCursor = crDefault;

procedure StartWait(NewCursor: TCursor);
begin
  if WaitCount = 0 then
  begin
    SaveCursor := Screen.Cursor;
    Screen.Cursor := NewCursor;
  end;
  Inc(WaitCount);
end;

procedure StopWait;
begin
  if WaitCount > 0 then
  begin
    Dec(WaitCount);
    if WaitCount = 0 then
      Screen.Cursor := SaveCursor;
  end;
end;

function ResStr(Ident: Cardinal): string;
begin
  Result := LoadStr(Ident);
end;

end.