fpspreadsheet: Speed up biff writing for number and label cells in woSaveMemory mode by a factor of 4 (writing complete records instead of single bytes and words)

git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@3321 8e941d3f-bd1b-0410-a28a-d453659cc2b4

components/fpspreadsheet/examples/excel8demo/excel8write.lpi

@@ -113,7 +113,7 @@
     </Parsing>
     <Linking>
       <Debugging>
-        <DebugInfoType Value="dsStabs"/>
+        <DebugInfoType Value="dsDwarf2Set"/>
       </Debugging>
     </Linking>
   </CompilerOptions>

components/fpspreadsheet/examples/other/test_virtualmode.lpr

@@ -41,12 +41,12 @@ var
       // This makes the style of the "headerTemplate" cell available to
       // formatting of all virtual cells in row 0.
       // Important: The template cell must be an existing cell in the worksheet.
-    end else
-    if odd(random(10)) then begin
+    end else    {
+    if odd(random(10)) then }begin
       s := Format('R=%d-C=%d', [ARow, ACol]);
       AData := s;
-    end else
-      AData := 10000*ARow + ACol;
+    end {else
+      AData := 10000*ARow + ACol};
 
     // you can use the OnNeedData also to provide feedback on how the process
     // progresses:
@@ -65,8 +65,8 @@ begin
 
       { These are the essential commands to activate virtual mode: }
 
-//      workbook.WritingOptions := [woVirtualMode, woSaveMemory];
-      workbook.WritingOptions := [woVirtualMode];
+      workbook.WritingOptions := [woVirtualMode, woSaveMemory];
+//      workbook.WritingOptions := [woVirtualMode];
       { woSaveMemory can be omitted, but is essential for large files: it causes
         writing temporaray data to a file stream instead of a memory stream.
         woSaveMemory, however, considerably slows down writing of biff files. }
@@ -93,8 +93,8 @@ begin
       worksheet.WriteRowHeight(0, 3);
       worksheet.WriteColWidth(0, 30);
       { In case of a database, you would open the dataset before calling this: }
-      workbook.WriteToFile('test_virtual.xlsx', sfOOXML, true);
-//      workbook.WriteToFile('test_virtual.xls', sfExcel8, true);
+      //workbook.WriteToFile('test_virtual.xlsx', sfOOXML, true);
+      workbook.WriteToFile('test_virtual.xls', sfExcel8, true);
 
     finally
       workbook.Free;

components/fpspreadsheet/xlsbiff8.pas

@@ -924,18 +924,29 @@ end;
 *******************************************************************}
 procedure TsSpreadBIFF8Writer.WriteLabel(AStream: TStream; const ARow,
   ACol: Cardinal; const AValue: string; ACell: PCell);
+type
+  TLabelRecord = packed record
+    RecordID: Word;
+    RecordSize: Word;
+    Row: Word;
+    Col: Word;
+    XFIndex: Word;
+    TextLen: Word;
+    TextFlags: Byte;
+  end;
 const
   //limit for this format: 32767 bytes - header (see reclen below):
   //37267-8-1=32758
-  MaxBytes=32758;
+  MAXBYTES = 32758;
 var
   L, RecLen: Word;
   TextTooLong: boolean=false;
   WideValue: WideString;
+  rec: TLabelRecord;
+  buf: array of byte;
 begin
   WideValue := UTF8Decode(AValue); //to UTF16
-  if WideValue = '' then
-  begin
+  if WideValue = '' then begin
     // Badly formatted UTF8String (maybe ANSI?)
     if Length(AValue)<>0 then begin
       //Quite sure it was an ANSI string written as UTF8, so raise exception.
@@ -944,15 +955,43 @@ begin
     Exit;
   end;
 
-  if Length(WideValue)>MaxBytes then
-  begin
+  if Length(WideValue) > MAXBYTES then begin
     // Rather than lose data when reading it, let the application programmer deal
     // with the problem or purposefully ignore it.
     TextTooLong := true;
-    SetLength(WideValue,MaxBytes); //may corrupt the string (e.g. in surrogate pairs), but... too bad.
+    SetLength(WideValue, MaxBytes); //may corrupt the string (e.g. in surrogate pairs), but... too bad.
   end;
   L := Length(WideValue);
 
+  { BIFF record header }
+  rec.RecordID := WordToLE(INT_EXCEL_ID_LABEL);
+  rec.RecordSize := 8 + 1 + L * SizeOf(WideChar);
+
+  { BIFF record data }
+  rec.Row := WordToLE(ARow);
+  rec.Col := WordToLE(ACol);
+
+  { Index to XF record, according to formatting }
+  rec.XFIndex := WordToLE(FindXFIndex(ACell));
+
+  { Byte String with 16-bit length }
+  rec.TextLen := WordToLE(L);
+
+  { Byte flags, 1 means regular unicode LE encoding }
+  rec.TextFlags := 1;
+
+  { Copy the text characters into a buffer immediately after rec }
+  SetLength(buf, SizeOf(rec) + L*SizeOf(WideChar));
+  Move(rec, buf[0], SizeOf(Rec));
+  Move(WideStringToLE(WideValue)[1], buf[SizeOf(Rec)], L*SizeOf(WideChar));
+
+  { Write out }
+  AStream.WriteBuffer(buf[0], SizeOf(rec) + L*SizeOf(WideChar));
+
+  { Clean up }
+  SetLength(buf, 0);
+
+    (*
   { BIFF Record header }
   AStream.WriteWord(WordToLE(INT_EXCEL_ID_LABEL));
   RecLen := 8 + 1 + L * SizeOf(WideChar);
@@ -978,7 +1017,7 @@ begin
   if TextTooLong then
     Raise Exception.CreateFmt('Text value exceeds %d character limit in cell [%d,%d]. Text has been truncated.',[MaxBytes,ARow,ACol]);
   because the file wouldn't be written.
-  }
+  }    *)
 end;
 
 {*******************************************************************

components/fpspreadsheet/xlscommon.pas

@@ -448,6 +448,7 @@ type
     FLastCol: Cardinal;
     procedure AddDefaultFormats; override;
     procedure CreateNumFormatList; override;
+    function FindXFIndex(ACell: PCell): Integer;
     procedure GetLastRowCallback(ACell: PCell; AStream: TStream);
     function GetLastRowIndex(AWorksheet: TsWorksheet): Integer;
     procedure GetLastColCallback(ACell: PCell; AStream: TStream);
@@ -1655,6 +1656,32 @@ begin
   FNumFormatList := TsBIFFNumFormatList.Create(Workbook);
 end;
 
+{ Determines the index of the XF record, according to formatting of the given cell }
+function TsSpreadBIFFWriter.FindXFIndex(ACell: PCell): Integer;
+var
+  idx: Integer;
+  xfIndex: Word;
+  cell: TCell;
+begin
+  // First try the fast methods for default formats
+  if ACell^.UsedFormattingFields = [] then begin
+    Result := 15;   //XF15; see TsSpreadBIFF8Writer.AddDefaultFormats
+    Exit;
+  end;
+
+  // If not, then we need to search in the list of dynamic formats
+  // But we have to consider that the number formats of the cell is in fpc syntax,
+  // but the number format list of the writer is in Excel syntax.
+  cell := ACell^;
+  idx := FindFormattingInList(@cell);
+
+  // Carefully check the index
+  if (idx < 0) or (idx > Length(FFormattingStyles)) then
+    Result := -1
+  else
+    Result := FFormattingStyles[idx].Row;
+end;
+
 function TsSpreadBIFFWriter.FormulaElementKindToExcelTokenID(
   AElementKind: TFEKind; out ASecondaryID: Word): Word;
 begin
@@ -1836,7 +1863,36 @@ end;
   Valid for BIFF5 and BIFF8 (BIFF2 has a different record structure.). }
 procedure TsSpreadBIFFWriter.WriteNumber(AStream: TStream;
   const ARow, ACol: Cardinal; const AValue: double; ACell: PCell);
+type
+  TNumberRecord = packed record
+    RecordID: Word;
+    RecordSize: Word;
+    Row: Word;
+    Col: Word;
+    XFIndex: Word;
+    Value: Double;
+  end;
+var
+  rec: TNumberRecord;
 begin
+  { BIFF Record header }
+  rec.RecordID := WordToLE(INT_EXCEL_ID_NUMBER);
+  rec.RecordSize := WordToLE(14);
+
+  { BIFF Record data }
+  rec.Row := WordToLE(ARow);
+  rec.Col := WordToLE(ACol);
+
+  { Index to XF record }
+  rec.XFIndex := FindXFIndex(ACell);
+
+  { IEE 754 floating-point value }
+  rec.Value := AValue;
+
+  AStream.WriteBuffer(rec, sizeof(Rec));
+end;
+      (*
+
   { BIFF Record header }
   AStream.WriteWord(WordToLE(INT_EXCEL_ID_NUMBER));
   AStream.WriteWord(WordToLE(14));
@@ -1850,7 +1906,7 @@ begin
 
   { IEE 754 floating-point value }
   AStream.WriteBuffer(AValue, 8);
-end;
+end;         *)
 
 procedure TsSpreadBIFFWriter.WritePalette(AStream: TStream);
 var