Zoom optimized now.

git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@1737 8e941d3f-bd1b-0410-a28a-d453659cc2b4

applications/lazimageeditor/DLBitmap.pas

@@ -1,3 +1,15 @@
+{
+  Authors: Felipe Monteiro de Carvalho, Yang JiXian
+
+  License: The same modifying LGPL with static linking exception as the LCL
+
+  This unit implements the TDLBitmap class which has similar property "ScanLine"
+  of Delphi TBitmap. With this property we can reuse some classic code of delphi
+  to yield our platform independent bitmap class. We hope it simple and powerful.
+
+  Also some useful image process function has been added into the class.
+}
+
 unit DLBitmap;
 
 {$mode objfpc}{$H+}

applications/lazimageeditor/DLBmpUtils.inc

@@ -1,5 +1,9 @@
 {
-These are the TDLBitmap process functions.
+  Authors: Felipe Monteiro de Carvalho, Yang JiXian
+
+  License: The same modifying LGPL with static linking exception as the LCL
+
+  Those are the TDLBitmap process functions.
 }
 
 procedure LazBMPRotate90(const aBitmap: TDLBitmap; IsTurnRight: boolean);
@@ -786,44 +790,35 @@ begin
   Dest.Width := dw;
   Dest.Height := dh;
   if dw > aWidth then
-    xlen := aWidth
+  begin
+    xlen := Min(aWidth + Posx, dw);
+    xpos := Posx;
+  end
   else
+  begin
     xlen := dw;
-  if dh > aHeight then
-    ylen := aHeight
-  else
-    ylen := dh;
-{  if Pos.y > 0 then
-    ypos := Pos.y - NewTop
-  else
-    ypos := 0;
-  if Pos.x > 0 then
-    xpos := Pos.x - NewLeft
-  else
-    xpos := 0;    }
-  if aWidth > dw then
     xpos := 0
+  end;
+  if dh > aHeight then
+  begin
+    ylen := Min(aHeight + Posy, dh);
+    ypos := Posy;
+  end
   else
-    xpos := Posx - NewLeft;
-  if aHeight > dh then
+  begin
+    ylen := dh;
     ypos := 0
-  else
-    ypos := Posy - NewTop;
-{  for  i := ypos to ylen - 1 do
+  end;
+  for  i := ypos to ylen - 1 do
   begin
     LScan1 := Dest.Scanline[i];
     LScan2 := Src.Scanline[Trunc(i / sh)];
     for  j := xpos to xlen - 1 do
     begin
       k := Trunc(j / sw);
-      LScan1[j].rgbtBlue := LScan2[k].rgbtBlue;
-      LScan1[j].rgbtGreen := LScan2[k].rgbtGreen;
-      LScan1[j].rgbtRed := LScan2[k].rgbtRed;
+      LScan1[j] := LScan2[k];
     end;
-  end;    }
-    for  i := ypos to ylen - 1 do
-    for  j := xpos to xlen - 1 do
-      Dest.Pixels[j, i] := Src.Pixels[Trunc(j / sw), Trunc(i / sh)];
+  end;
   Dest.InvalidateScanLine;
   ACanvas.Draw(NewLeft, NewTop, Dest);
   Dest.Free;

applications/lazimageeditor/bmprgbtypes.pas

@@ -128,7 +128,7 @@ type
     procedure FuzzyRectangle(X1, Y1, X2, Y2: integer);
   public
     procedure DrawTo(ACanvas: TCanvas; X, Y: integer);
-    procedure StretchDrawTo(ACanvas: TCanvas; DstX, DstY, DstWidth, DstHeight: integer);
+    procedure StretchDrawTo(ACanvas: TCanvas; DstX, DstY, DstWidth, DstHeight, HPos, VPos, aWidth, aHeight: integer);
 
     property EraseMode: TEraseMode read FEraseMode write FEraseMode;
     property DrawMode: TDrawMode read FDrawMode write FDrawMode;
@@ -596,12 +596,12 @@ begin
 end;
 
 procedure TRGBBitmapCore.StretchDrawTo(ACanvas: TCanvas;
-  DstX, DstY, DstWidth, DstHeight: integer);
+  DstX, DstY, DstWidth, DstHeight, HPos, VPos, aWidth, aHeight: integer);
 begin
  // if ACanvas <> nil then
   //  ACanvas.StretchDraw(Rect(DstX, DstY, DstWidth, DstHeight), Self);
  //   StretchDLBMP(Self, 3, 3);
-    StretchDLBMP(ACanvas, Self, DstX, DstY, DstWidth, DstHeight);
+    StretchDLBMPEx(ACanvas, Self, DstX, DstY, DstWidth, DstHeight, HPos, VPos, aWidth, aHeight);
   {begin
     ACanvas.AntialiasingMode:=amOff;
     ACanvas.CopyMode:=cmSrcPaint;

applications/lazimageeditor/picturectrls.pas

@@ -434,6 +434,7 @@ begin
   FScrollStop := TPanel.Create(Self);
   FScrollStop.SetBounds(0, 0, 0, 0);
   FScrollStop.Parent := Self;
+  Self.AutoScroll := True;
 end;
 
 destructor TCustomPictureView.Destroy;
@@ -444,13 +445,13 @@ end;
 procedure TCustomPictureView.WMHScroll(var Message : TLMHScroll);
 begin
   inherited;
-  HorzPos := Message.Pos;
+  //HorzPos := Message.Pos;
 end;
 
 procedure TCustomPictureView.WMVScroll(var Message : TLMVScroll);
 begin
   inherited;
-  VertPos := Message.Pos;
+  //VertPos := Message.Pos;
 end;
 
 procedure TCustomPictureView.Paint;
@@ -468,10 +469,10 @@ begin
 
     if Assigned(FPicture) then
     begin
+      HorzPos := HorzScrollbar.Position;
+      VertPos := VertScrollbar.Position;
       FPicture.StretchDrawTo(Canvas, FPictureRect.Left, FPictureRect.Top,
-        FPictureRect.Right, FPictureRect.Bottom, HorzPos,
-        VertPos, Width, Height);
-    application.Mainform.Caption := IntToStr(HorzPos);
+        FPictureRect.Right, FPictureRect.Bottom, HorzPos, VertPos, Width, Height);
       if (poShowGrid in Options) and (Zoom > 2.0) then
       begin
         Pen.Color := clGray;