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{
$Id: ImagingUtility.pas 86 2007-06-12 22:39:08Z galfar $
Vampyre Imaging Library
by Marek Mauder
http://imaginglib.sourceforge.net
The contents of this file are used with permission, subject to the Mozilla
Public License Version 1.1 (the "License"); you may not use this file except
in compliance with the License. You may obtain a copy of the License at
http://www.mozilla.org/MPL/MPL-1.1.html
Software distributed under the License is distributed on an "AS IS" basis,
WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
the specific language governing rights and limitations under the License.
Alternatively, the contents of this file may be used under the terms of the
GNU Lesser General Public License (the "LGPL License"), in which case the
provisions of the LGPL License are applicable instead of those above.
If you wish to allow use of your version of this file only under the terms
of the LGPL License and not to allow others to use your version of this file
under the MPL, indicate your decision by deleting the provisions above and
replace them with the notice and other provisions required by the LGPL
License. If you do not delete the provisions above, a recipient may use
your version of this file under either the MPL or the LGPL License.
For more information about the LGPL: http://www.gnu.org/copyleft/lesser.html
}
{ This unit contains utility functions and types for Imaging library.}
unit ImagingUtility;
{$I ImagingOptions.inc}
interface
uses
SysUtils, Classes, Types;
const
STrue = 'True';
SFalse = 'False';
type
TByteArray = array[0..MaxInt - 1] of Byte;
PByteArray = ^TByteArray;
TWordArray = array[0..MaxInt div 2 - 1] of Word;
PWordArray = ^TWordArray;
TLongIntArray = array[0..MaxInt div 4 - 1] of LongInt;
PLongIntArray = ^TLongIntArray;
TLongWordArray = array[0..MaxInt div 4 - 1] of LongWord;
PLongWordArray = ^TLongWordArray;
TInt64Array = array[0..MaxInt div 8 - 1] of Int64;
PInt64Array = ^TInt64Array;
TSingleArray = array[0..MaxInt div 4 - 1] of Single;
PSingleArray = ^TSingleArray;
TBooleanArray = array[0..MaxInt - 1] of Boolean;
PBooleanArray = ^TBooleanArray;
TWordRec = packed record
case Integer of
0: (WordValue: Word);
1: (Low, High: Byte);
end;
PWordRec = ^TWordRec;
TWordRecArray = array[0..MaxInt div 2 - 1] of TWordRec;
PWordRecArray = ^TWordRecArray;
TLongWordRec = packed record
case Integer of
0: (LongWordValue: LongWord);
1: (Low, High: Word);
{ Array variants - Index 0 means lowest significant byte (word, ...).}
2: (Words: array[0..1] of Word);
3: (Bytes: array[0..3] of Byte);
end;
PLongWordRec = ^TLongWordRec;
TLongWordRecArray = array[0..MaxInt div 4 - 1] of TLongWordRec;
PLongWordRecArray = ^TLongWordRecArray;
TInt64Rec = packed record
case Integer of
0: (Int64Value: Int64);
1: (Low, High: LongWord);
{ Array variants - Index 0 means lowest significant byte (word, ...).}
2: (Words: array[0..3] of Word);
3: (Bytes: array[0..7] of Byte);
end;
PInt64Rec = ^TInt64Rec;
TInt64RecArray = array[0..MaxInt div 8 - 1] of TInt64Rec;
PInt64RecArray = ^TInt64RecArray;
TFloatHelper = record
Data1: Int64;
Data2: Int64;
end;
PFloatHelper = ^TFloatHelper;
TChar2 = array[0..1] of Char;
TChar3 = array[0..2] of Char;
TChar4 = array[0..3] of Char;
TChar8 = array[0..7] of Char;
{ Options for BuildFileList function:
flFullNames - file names in result will have full path names
(ExtractFileDir(Path) + FileName)
flRelNames - file names in result will have names relative to
ExtractFileDir(Path) dir
flRecursive - adds files in subdirectories found in Path.}
TFileListOption = (flFullNames, flRelNames, flRecursive);
TFileListOptions = set of TFileListOption;
{ Frees class instance and sets its reference to nil.}
procedure FreeAndNil(var Obj);
{ Frees pointer and sets it to nil.}
procedure FreeMemNil(var P); {$IFDEF USE_INLINE}inline;{$ENDIF}
{ Replacement of standard System.FreeMem procedure which checks if P is nil
(this is only needed for Free Pascal, Delphi makes checks in its FreeMem).}
procedure FreeMem(P: Pointer); {$IFDEF USE_INLINE}inline;{$ENDIF}
{ Returns current exception object. Do not call outside exception handler.}
function GetExceptObject: Exception; {$IFDEF USE_INLINE}inline;{$ENDIF}
{ Returns time value with microsecond resolution. Use for some time counters.}
function GetTimeMicroseconds: Int64;
{ Returns file extension (without "." dot)}
function GetFileExt(const FileName: string): string;
{ Returns file name of application's executable.}
function GetAppExe: string;
{ Returns directory where application's exceutable is located without
path delimiter at the end.}
function GetAppDir:string;
{ Returns True if FileName matches given Mask with optional case sensitivity.
Mask can contain ? and * special characters: ? matches
one character, * matches zero or more characters.}
function MatchFileNameMask(const FileName, Mask: string; CaseSensitive: Boolean = False): Boolean;
{ This function fills Files string list with names of files found
with FindFirst/FindNext functions (See details on Path/Atrr here).
- BuildFileList('c:\*.*', faAnyFile, List, [flRecursive]) returns
list of all files (only name.ext - no path) on C drive
- BuildFileList('d:\*.*', faDirectory, List, [flFullNames]) returns
list of all directories (d:\dirxxx) in root of D drive.}
function BuildFileList(Path: string; Attr: LongInt; Files: TStrings;
Options: TFileListOptions = []): Boolean;
{ Similar to RTL's Pos function but with optional Offset where search will start.
This function is in the RTL StrUtils unit but }
function PosEx(const SubStr, S: string; Offset: LongInt = 1): LongInt;
{ Same as PosEx but without case sensitivity.}
function PosNoCase(const SubStr, S: string; Offset: LongInt = 1): LongInt; {$IFDEF USE_INLINE}inline;{$ENDIF}
{ Returns a sub-string from S which is followed by
Sep separator and deletes the sub-string from S including the separator.}
function StrToken(var S: string; Sep: Char): string;
{ Same as StrToken but searches from the end of S string.}
function StrTokenEnd(var S: string; Sep: Char): string;
{ Clamps integer value to range <Min, Max>}
function ClampInt(Number: LongInt; Min, Max: LongInt): LongInt; {$IFDEF USE_INLINE}inline;{$ENDIF}
{ Clamps float value to range <Min, Max>}
function ClampFloat(Number: Single; Min, Max: Single): Single; {$IFDEF USE_INLINE}inline;{$ENDIF}
{ Clamps integer value to Byte boundaries.}
function ClampToByte(Value: LongInt): LongInt; {$IFDEF USE_INLINE}inline;{$ENDIF}
{ Clamps integer value to Word boundaries.}
function ClampToWord(Value: LongInt): LongInt; {$IFDEF USE_INLINE}inline;{$ENDIF}
{ Returns True if Num is power of 2.}
function IsPow2(Num: LongInt): Boolean; {$IFDEF USE_INLINE}inline;{$ENDIF}
{ Returns next power of 2 greater than or equal to Num
(if Num itself is power of 2 then it retuns Num).}
function NextPow2(Num: LongInt): LongInt; {$IFDEF USE_INLINE}inline;{$ENDIF}
{ Raises 2 to the given integer power (in range [0, 30]).}
function Pow2Int(Exponent: LongInt): LongInt; {$IFDEF USE_INLINE}inline;{$ENDIF}
{ Raises Base to any power.}
function Power(const Base, Exponent: Single): Single;
{ Returns log base 2 of integer X (max 2^30) or -1 if X is not power of 2.}
function Log2Int(X: LongInt): LongInt; {$IFDEF USE_INLINE}inline;{$ENDIF}
{ Returns log base 2 of X.}
function Log2(X: Single): Single;
{ Returns largest integer <= Val (for 5.9 returns 5).}
function Floor(Value: Single): LongInt; {$IFDEF USE_INLINE}inline;{$ENDIF}
{ Returns smallest integer >= Val (for 5.1 returns 6).}
function Ceil(Value: Single): LongInt; {$IFDEF USE_INLINE}inline;{$ENDIF}
{ Returns lesser of two integer numbers.}
function Min(A, B: LongInt): LongInt; {$IFDEF USE_INLINE}inline;{$ENDIF}
{ Returns lesser of two float numbers.}
function MinFloat(A, B: Single): Single; {$IFDEF USE_INLINE}inline;{$ENDIF}
{ Returns greater of two integer numbers.}
function Max(A, B: LongInt): LongInt; {$IFDEF USE_INLINE}inline;{$ENDIF}
{ Returns greater of two float numbers.}
function MaxFloat(A, B: Single): Single; {$IFDEF USE_INLINE}inline;{$ENDIF}
{ Returns result from multiplying Number by Numerator and then dividing by Denominator.
Denominator must be greater than 0.}
function MulDiv(Number, Numerator, Denominator: Word): Word; {$IFDEF USE_INLINE}inline;{$ENDIF}
{ Switches Boolean value.}
procedure Switch(var Value: Boolean); {$IFDEF USE_INLINE}inline;{$ENDIF}
{ If Condition is True then TruePart is retured, otherwise
FalsePart is returned.}
function Iff(Condition: Boolean; TruePart, FalsePart: LongInt): LongInt; overload; {$IFDEF USE_INLINE}inline;{$ENDIF}
{ If Condition is True then TruePart is retured, otherwise
FalsePart is returned.}
function IffUnsigned(Condition: Boolean; TruePart, FalsePart: LongWord): LongWord; overload; {$IFDEF USE_INLINE}inline;{$ENDIF}
{ If Condition is True then TruePart is retured, otherwise
FalsePart is returned.}
function Iff(Condition, TruePart, FalsePart: Boolean): Boolean; overload; {$IFDEF USE_INLINE}inline;{$ENDIF}
{ If Condition is True then TruePart is retured, otherwise
FalsePart is returned.}
function Iff(Condition: Boolean; const TruePart, FalsePart: string): string; overload; {$IFDEF USE_INLINE}inline;{$ENDIF}
{ If Condition is True then TruePart is retured, otherwise
FalsePart is returned.}
function Iff(Condition: Boolean; TruePart, FalsePart: Char): Char; overload; {$IFDEF USE_INLINE}inline;{$ENDIF}
{ If Condition is True then TruePart is retured, otherwise
FalsePart is returned.}
function Iff(Condition: Boolean; TruePart, FalsePart: Pointer): Pointer; overload; {$IFDEF USE_INLINE}inline;{$ENDIF}
{ If Condition is True then TruePart is retured, otherwise
FalsePart is returned.}
function Iff(Condition: Boolean; const TruePart, FalsePart: Int64): Int64; overload; {$IFDEF USE_INLINE}inline;{$ENDIF}
{ If Condition is True then TruePart is retured, otherwise
FalsePart is returned.}
function IffFloat(Condition: Boolean; TruePart, FalsePart: Single): Single; {$IFDEF USE_INLINE}inline;{$ENDIF}
{ Swaps two Byte values}
procedure SwapValues(var A, B: Byte); overload;
{ Swaps two Word values}
procedure SwapValues(var A, B: Word); overload;
{ Swaps two LongInt values}
procedure SwapValues(var A, B: LongInt); overload;
{ Swaps two Single values}
procedure SwapValues(var A, B: Single); overload;
{ Swaps two LongInt values if necessary to ensure that Min <= Max.}
procedure SwapMin(var Min, Max: LongInt); {$IFDEF USE_INLINE}inline;{$ENDIF}
{ This function returns True if running on little endian machine.}
function IsLittleEndian: Boolean; {$IFDEF USE_INLINE}inline;{$ENDIF}
{ Swaps byte order of Word value.}
function SwapEndianWord(Value: Word): Word; overload; {$IFDEF USE_INLINE}inline;{$ENDIF}
{ Swaps byte order of multiple Word values.}
procedure SwapEndianWord(P: PWordArray; Count: LongInt); overload;
{ Swaps byte order of LongWord value.}
function SwapEndianLongWord(Value: LongWord): LongWord; overload; {$IFDEF USE_INLINE}inline;{$ENDIF}
{ Swaps byte order of multiple LongWord values.}
procedure SwapEndianLongWord(P: PLongWord; Count: LongInt); overload;
{ Calculates CRC32 for the given data.}
procedure CalcCrc32(var Crc: LongWord; Data: Pointer; Size: LongInt);
{ Fills given memory with given Byte value. Size is size of buffer in bytes.}
procedure FillMemoryByte(Data: Pointer; Size: LongInt; Value: Byte);
{ Fills given memory with given Word value. Size is size of buffer in bytes.}
procedure FillMemoryWord(Data: Pointer; Size: LongInt; Value: Word);
{ Fills given memory with given LongWord value. Size is size of buffer in bytes.}
procedure FillMemoryLongWord(Data: Pointer; Size: LongInt; Value: LongWord);
{ Returns how many mipmap levels can be created for image of given size.}
function GetNumMipMapLevels(Width, Height: LongInt): LongInt;
{ Returns total number of levels of volume texture with given depth and
mipmap count (this is not depth * mipmaps!).}
function GetVolumeLevelCount(Depth, MipMaps: LongInt): LongInt;
{ Returns rectangle (X, Y, X + Width, Y + Height).}
function BoundsToRect(X, Y, Width, Height: LongInt): TRect; overload; {$IFDEF USE_INLINE}inline;{$ENDIF}
{ Returns rectangle (R.Left, R.Top, R.Left + R.Right, R.Top + R.Bottom).}
function BoundsToRect(const R: TRect): TRect; overload; {$IFDEF USE_INLINE}inline;{$ENDIF}
{ Returns rectangle (R.Left, R.Top, R.Right - R.Left, R.Bottom - R.Top).}
function RectToBounds(const R: TRect): TRect; overload; {$IFDEF USE_INLINE}inline;{$ENDIF}
{ Clips given bounds to Clip rectangle.}
procedure ClipRectBounds(var X, Y, Width, Height: LongInt; const Clip: TRect);
{ Clips given source bounds and dest position. It is used by various CopyRect
functions that copy rect from one image to another. It handles clipping the same way
as Win32 BitBlt function. }
procedure ClipCopyBounds(var SrcX, SrcY, Width, Height, DstX, DstY: LongInt;
SrcImageWidth, SrcImageHeight: LongInt; const DstClip: TRect);
{ Clips given source bounds and dest bounds. It is used by various StretchRect
functions that stretch rectangle of pixels from one image to another.
It handles clipping the same way as Win32 StretchBlt function. }
procedure ClipStretchBounds(var SrcX, SrcY, SrcWidth, SrcHeight, DstX, DstY,
DstWidth, DstHeight: LongInt; SrcImageWidth, SrcImageHeight: LongInt; const DstClip: TRect);
{ Scales one rectangle to fit into another. Proportions are preserved so
it could be used for 'Stretch To Fit Window' image drawing for instance.}
function ScaleRectToRect(const SourceRect, TargetRect: TRect): TRect;
{ Returns True if R1 fits into R2.}
function RectInRect(const R1, R2: TRect): Boolean;
{ Returns True if R1 and R2 intersects.}
function RectIntersects(const R1, R2: TRect): Boolean;
{ Formats given message for usage in Exception.Create(..). Use only
in except block - returned message contains message of last raised exception.}
function FormatExceptMsg(const Msg: string; const Args: array of const): string;
{ Outputs debug message - shows message dialog in Windows and writes to console
in Linux/Unix.}
procedure DebugMsg(const Msg: string; const Args: array of const);
implementation
uses
{$IFDEF MSWINDOWS}
Windows;
{$ENDIF}
{$IFDEF UNIX}
{$IFDEF KYLIX}
Libc;
{$ELSE}
Dos, BaseUnix, Unix;
{$ENDIF}
{$ENDIF}
procedure FreeAndNil(var Obj);
var
Temp: TObject;
begin
Temp := TObject(Obj);
Pointer(Obj) := nil;
Temp.Free;
end;
procedure FreeMemNil(var P);
begin
FreeMem(Pointer(P));
Pointer(P) := nil;
end;
procedure FreeMem(P: Pointer);
begin
if P <> nil then
System.FreeMem(P);
end;
function GetExceptObject: Exception;
begin
Result := Exception(ExceptObject);
end;
{$IFDEF MSWINDOWS}
var
PerfFrequency: Int64;
InvPerfFrequency: Single;
function GetTimeMicroseconds: Int64;
var
Time: Int64;
begin
QueryPerformanceCounter(Time);
Result := Round(1000000 * InvPerfFrequency * Time);
end;
{$ENDIF}
{$IFDEF UNIX}
function GetTimeMicroseconds: Int64;
var
TimeVal: TTimeVal;
begin
{$IFDEF KYLIX}
GetTimeOfDay(TimeVal, nil);
{$ELSE}
fpGetTimeOfDay(@TimeVal, nil);
{$ENDIF}
Result := Int64(TimeVal.tv_sec) * 1000000 + TimeVal.tv_usec;
end;
{$ENDIF}
{$IFDEF MSDOS}
function GetTimeMicroseconds: Int64;
asm
XOR EAX, EAX
CLI
OUT $43, AL
MOV EDX, FS:[$46C]
IN AL, $40
DB $EB, 0, $EB, 0, $EB, 0
MOV AH, AL
IN AL, $40
DB $EB, 0, $EB, 0, $EB, 0
XCHG AL, AH
NEG AX
MOVZX EDI, AX
STI
MOV EBX, $10000
MOV EAX, EDX
XOR EDX, EDX
MUL EBX
ADD EAX, EDI
ADC EDX, 0
PUSH EDX
PUSH EAX
MOV ECX, $82BF1000
MOVZX EAX, WORD PTR FS:[$470]
MUL ECX
MOV ECX, EAX
POP EAX
POP EDX
ADD EAX, ECX
ADC EDX, 0
end;
{$ENDIF}
function GetFileExt(const FileName: string): string;
begin
Result := ExtractFileExt(FileName);
if Length(Result) > 1 then
Delete(Result, 1, 1);
end;
function GetAppExe: string;
{$IFDEF MSWINDOWS}
var
FileName: array[0..MAX_PATH] of Char;
begin
SetString(Result, FileName,
Windows.GetModuleFileName(MainInstance, FileName, SizeOf(FileName)));
{$ENDIF}
{$IFDEF UNIX}
{$IFDEF KYLIX}
var
FileName: array[0..FILENAME_MAX] of Char;
begin
SetString(Result, FileName,
System.GetModuleFileName(MainInstance, FileName, SizeOf(FileName)));
{$ELSE}
begin
Result := FExpand(ParamStr(0));
{$ENDIF}
{$ENDIF}
{$IFDEF MSDOS}
begin
Result := ParamStr(0);
{$ENDIF}
end;
function GetAppDir:string;
begin
Result := ExtractFileDir(GetAppExe);
end;
function MatchFileNameMask(const FileName, Mask: string; CaseSensitive: Boolean): Boolean;
var
MaskLen, KeyLen : LongInt;
function CharMatch(A, B: Char): Boolean;
begin
if CaseSensitive then
Result := A = B
else
Result := UpCase(A) = UpCase(B);
end;
function MatchAt(MaskPos, KeyPos: LongInt): Boolean;
begin
while (MaskPos <= MaskLen) and (KeyPos <= KeyLen) do
begin
case Mask[MaskPos] of
'?' :
begin
Inc(MaskPos);
Inc(KeyPos);
end;
'*' :
begin
while (MaskPos <= MaskLen) and (Mask[MaskPos] = '*') do
Inc(MaskPos);
if MaskPos > MaskLen then
begin
Result := True;
Exit;
end;
repeat
if MatchAt(MaskPos, KeyPos) then
begin
Result := True;
Exit;
end;
Inc(KeyPos);
until KeyPos > KeyLen;
Result := False;
Exit;
end;
else
if not CharMatch(Mask[MaskPos], FileName[KeyPos]) then
begin
Result := False;
Exit;
end
else
begin
Inc(MaskPos);
Inc(KeyPos);
end;
end;
end;
while (MaskPos <= MaskLen) and (Mask[MaskPos] in ['?', '*']) do
Inc(MaskPos);
if (MaskPos <= MaskLen) or (KeyPos <= KeyLen) then
begin
Result := False;
Exit;
end;
Result := True;
end;
begin
MaskLen := Length(Mask);
KeyLen := Length(FileName);
if MaskLen = 0 then
begin
Result := True;
Exit;
end;
Result := MatchAt(1, 1);
end;
function BuildFileList(Path: string; Attr: LongInt;
Files: TStrings; Options: TFileListOptions): Boolean;
var
FileMask: string;
RootDir: string;
Folders: TStringList;
CurrentItem: LongInt;
Counter: LongInt;
LocAttr: LongInt;
procedure BuildFolderList;
var
FindInfo: TSearchRec;
Rslt: LongInt;
begin
Counter := Folders.Count - 1;
CurrentItem := 0;
while CurrentItem <= Counter do
begin
// Searching for subfolders
Rslt := SysUtils.FindFirst(Folders[CurrentItem] + '*', faDirectory, FindInfo);
try
while Rslt = 0 do
begin
if (FindInfo.Name <> '.') and (FindInfo.Name <> '..') and
(FindInfo.Attr and faDirectory = faDirectory) then
Folders.Add(Folders[CurrentItem] + FindInfo.Name + PathDelim);
Rslt := SysUtils.FindNext(FindInfo);
end;
finally
SysUtils.FindClose(FindInfo);
end;
Counter := Folders.Count - 1;
Inc(CurrentItem);
end;
end;
procedure FillFileList(CurrentCounter: LongInt);
var
FindInfo: TSearchRec;
Res: LongInt;
CurrentFolder: string;
begin
CurrentFolder := Folders[CurrentCounter];
Res := SysUtils.FindFirst(CurrentFolder + FileMask, LocAttr, FindInfo);
if flRelNames in Options then
CurrentFolder := ExtractRelativePath(RootDir, CurrentFolder);
try
while Res = 0 do
begin
if (FindInfo.Name <> '.') and (FindInfo.Name <> '..') then
begin
if (flFullNames in Options) or (flRelNames in Options) then
Files.Add(CurrentFolder + FindInfo.Name)
else
Files.Add(FindInfo.Name);
end;
Res := SysUtils.FindNext(FindInfo);
end;
finally
SysUtils.FindClose(FindInfo);
end;
end;
begin
FileMask := ExtractFileName(Path);
RootDir := ExtractFilePath(Path);
Folders := TStringList.Create;
Folders.Add(RootDir);
Files.Clear;
{$IFDEF DCC}
{$WARN SYMBOL_PLATFORM OFF}
{$ENDIF}
if Attr = faAnyFile then
LocAttr := faSysFile or faHidden or faArchive or faReadOnly
else
LocAttr := Attr;
{$IFDEF DCC}
{$WARN SYMBOL_PLATFORM ON}
{$ENDIF}
// Here's the recursive search for nested folders
if flRecursive in Options then
BuildFolderList;
if Attr <> faDirectory then
for Counter := 0 to Folders.Count - 1 do
FillFileList(Counter)
else
Files.AddStrings(Folders);
Folders.Free;
Result := True;
end;
function PosEx(const SubStr, S: string; Offset: LongInt = 1): LongInt;
{$IFDEF USE_ASM}
asm
// The Original ASM Code is (C) Fastcode project.
test eax, eax
jz @Nil
test edx, edx
jz @Nil
dec ecx
jl @Nil
push esi
push ebx
mov esi, [edx-4] //Length(Str)
mov ebx, [eax-4] //Length(Substr)
sub esi, ecx //effective length of Str
add edx, ecx //addr of the first char at starting position
cmp esi, ebx
jl @Past //jump if EffectiveLength(Str)<Length(Substr)
test ebx, ebx
jle @Past //jump if Length(Substr)<=0
add esp, -12
add ebx, -1 //Length(Substr)-1
add esi, edx //addr of the terminator
add edx, ebx //addr of the last char at starting position
mov [esp+8], esi //save addr of the terminator
add eax, ebx //addr of the last char of Substr
sub ecx, edx //-@Str[Length(Substr)]
neg ebx //-(Length(Substr)-1)
mov [esp+4], ecx //save -@Str[Length(Substr)]
mov [esp], ebx //save -(Length(Substr)-1)
movzx ecx, byte ptr [eax] //the last char of Substr
@Loop:
cmp cl, [edx]
jz @Test0
@AfterTest0:
cmp cl, [edx+1]
jz @TestT
@AfterTestT:
add edx, 4
cmp edx, [esp+8]
jb @Continue
@EndLoop:
add edx, -2
cmp edx, [esp+8]
jb @Loop
@Exit:
add esp, 12
@Past:
pop ebx
pop esi
@Nil:
xor eax, eax
ret
@Continue:
cmp cl, [edx-2]
jz @Test2
cmp cl, [edx-1]
jnz @Loop
@Test1:
add edx, 1
@Test2:
add edx, -2
@Test0:
add edx, -1
@TestT:
mov esi, [esp]
test esi, esi
jz @Found
@String:
movzx ebx, word ptr [esi+eax]
cmp bx, word ptr [esi+edx+1]
jnz @AfterTestT
cmp esi, -2
jge @Found
movzx ebx, word ptr [esi+eax+2]
cmp bx, word ptr [esi+edx+3]
jnz @AfterTestT
add esi, 4
jl @String
@Found:
mov eax, [esp+4]
add edx, 2
cmp edx, [esp+8]
ja @Exit
add esp, 12
add eax, edx
pop ebx
pop esi
end;
{$ELSE}
var
I, X: LongInt;
Len, LenSubStr: LongInt;
begin
I := Offset;
LenSubStr := Length(SubStr);
Len := Length(S) - LenSubStr + 1;
while I <= Len do
begin
if S[I] = SubStr[1] then
begin
X := 1;
while (X < LenSubStr) and (S[I + X] = SubStr[X + 1]) do
Inc(X);
if (X = LenSubStr) then
begin
Result := I;
Exit;
end;
end;
Inc(I);
end;
Result := 0;
end;
{$ENDIF}
function PosNoCase(const SubStr, S: string; Offset: LongInt): LongInt;
begin
Result := PosEx(LowerCase(SubStr), LowerCase(S), Offset);
end;
function StrToken(var S: string; Sep: Char): string;
var
I: LongInt;
begin
I := Pos(Sep, S);
if I <> 0 then
begin
Result := Copy(S, 1, I - 1);
Delete(S, 1, I);
end
else
begin
Result := S;
S := '';
end;
end;
function StrTokenEnd(var S: string; Sep: Char): string;
var
I, J: LongInt;
begin
J := 0;
I := Pos(Sep, S);
while I <> 0 do
begin
J := I;
I := PosEx(Sep, S, J + 1);
end;
if J <> 0 then
begin
Result := Copy(S, J + 1, MaxInt);
Delete(S, J, MaxInt);
end
else
begin
Result := S;
S := '';
end;
end;
function ClampInt(Number: LongInt; Min, Max: LongInt): LongInt;
begin
Result := Number;
if Result < Min then
Result := Min
else
if Result > Max then
Result := Max;
end;
function ClampFloat(Number: Single; Min, Max: Single): Single;
begin
Result := Number;
if Result < Min then
Result := Min
else
if Result > Max then
Result := Max;
end;
function ClampToByte(Value: LongInt): LongInt;
begin
Result := Value;
if Result > 255 then
Result := 255
else if Result < 0 then
Result := 0;
end;
function ClampToWord(Value: LongInt): LongInt;
begin
Result := Value;
if Result > 65535 then
Result := 65535
else if Result < 0 then
Result := 0;
end;
function IsPow2(Num: LongInt): Boolean;
begin
Result := (Num and -Num) = Num;
end;
function NextPow2(Num: LongInt): LongInt;
begin
Result := Num and -Num;
while (Result < Num) do
Result := Result shl 1;
end;
function Pow2Int(Exponent: LongInt): LongInt;
begin
Result := 1 shl Exponent;
end;
function Power(const Base, Exponent: Single): Single;
begin
if Exponent = 0.0 then
Result := 1.0
else if (Base = 0.0) and (Exponent > 0.0) then
Result := 0.0
else
Result := Exp(Exponent * Ln(Base));
end;
function Log2Int(X: LongInt): LongInt;
begin
case X of
1: Result := 0;
2: Result := 1;
4: Result := 2;
8: Result := 3;
16: Result := 4;
32: Result := 5;
64: Result := 6;
128: Result := 7;
256: Result := 8;
512: Result := 9;
1024: Result := 10;
2048: Result := 11;
4096: Result := 12;
8192: Result := 13;
16384: Result := 14;
32768: Result := 15;
65536: Result := 16;
131072: Result := 17;
262144: Result := 18;
524288: Result := 19;
1048576: Result := 20;
2097152: Result := 21;
4194304: Result := 22;
8388608: Result := 23;
16777216: Result := 24;
33554432: Result := 25;
67108864: Result := 26;
134217728: Result := 27;
268435456: Result := 28;
536870912: Result := 29;
1073741824: Result := 30;
else
Result := -1;
end;
end;
function Log2(X: Single): Single;
const
Ln2: Single = 0.6931471;
begin
Result := Ln(X) / Ln2;
end;
function Floor(Value: Single): LongInt;
begin
Result := Trunc(Value);
if Frac(Value) < 0.0 then
Dec(Result);
end;
function Ceil(Value: Single): LongInt;
begin
Result := Trunc(Value);
if Frac(Value) > 0.0 then
Inc(Result);
end;
procedure Switch(var Value: Boolean);
begin
Value := not Value;
end;
function Iff(Condition: Boolean; TruePart, FalsePart: LongInt): LongInt;
begin
if Condition then
Result := TruePart
else
Result := FalsePart;
end;
function IffUnsigned(Condition: Boolean; TruePart, FalsePart: LongWord): LongWord;
begin
if Condition then
Result := TruePart
else
Result := FalsePart;
end;
function Iff(Condition, TruePart, FalsePart: Boolean): Boolean;
begin
if Condition then
Result := TruePart
else
Result := FalsePart;
end;
function Iff(Condition: Boolean; const TruePart, FalsePart: string): string;
begin
if Condition then
Result := TruePart
else
Result := FalsePart;
end;
function Iff(Condition: Boolean; TruePart, FalsePart: Char): Char;
begin
if Condition then
Result := TruePart
else
Result := FalsePart;
end;
function Iff(Condition: Boolean; TruePart, FalsePart: Pointer): Pointer;
begin
if Condition then
Result := TruePart
else
Result := FalsePart;
end;
function Iff(Condition: Boolean; const TruePart, FalsePart: Int64): Int64;
begin
if Condition then
Result := TruePart
else
Result := FalsePart;
end;
function IffFloat(Condition: Boolean; TruePart, FalsePart: Single): Single;
begin
if Condition then
Result := TruePart
else
Result := FalsePart;
end;
procedure SwapValues(var A, B: Byte);
var
Tmp: Byte;
begin
Tmp := A;
A := B;
B := Tmp;
end;
procedure SwapValues(var A, B: Word);
var
Tmp: Word;
begin
Tmp := A;
A := B;
B := Tmp;
end;
procedure SwapValues(var A, B: LongInt);
var
Tmp: LongInt;
begin
Tmp := A;
A := B;
B := Tmp;
end;
procedure SwapValues(var A, B: Single);
var
Tmp: Single;
begin
Tmp := A;
A := B;
B := Tmp;
end;
procedure SwapMin(var Min, Max: LongInt);
var
Tmp: LongInt;
begin
if Min > Max then
begin
Tmp := Min;
Min := Max;
Max := Tmp;
end;
end;
function Min(A, B: LongInt): LongInt;
begin
if A < B then
Result := A
else
Result := B;
end;
function MinFloat(A, B: Single): Single;
begin
if A < B then
Result := A
else
Result := B;
end;
function Max(A, B: LongInt): LongInt;
begin
if A > B then
Result := A
else
Result := B;
end;
function MaxFloat(A, B: Single): Single;
begin
if A > B then
Result := A
else
Result := B;
end;
function MulDiv(Number, Numerator, Denominator: Word): Word;
{$IF Defined(USE_ASM) and (not Defined(USE_INLINE))}
asm
MUL DX
DIV CX
end;
{$ELSE}
begin
Result := Number * Numerator div Denominator;
end;
{$IFEND}
function IsLittleEndian: Boolean;
var
W: Word;
begin
W := $00FF;
Result := PByte(@W)^ = $FF;
end;
function SwapEndianWord(Value: Word): Word;
{$IF Defined(USE_ASM) and (not Defined(USE_INLINE))}
asm
XCHG AH, AL
end;
{$ELSE}
begin
TWordRec(Result).Low := TWordRec(Value).High;
TWordRec(Result).High := TWordRec(Value).Low;
end;
{$IFEND}
procedure SwapEndianWord(P: PWordArray; Count: LongInt);
{$IFDEF USE_ASM}
asm
@Loop:
MOV CX, [EAX]
XCHG CH, CL
MOV [EAX], CX
ADD EAX, 2
DEC EDX
JNZ @Loop
end;
{$ELSE}
var
I: LongInt;
Temp: Word;
begin
for I := 0 to Count - 1 do
begin
Temp := P[I];
TWordRec(P[I]).Low := TWordRec(Temp).High;
TWordRec(P[I]).High := TWordRec(Temp).Low;
end;
end;
{$ENDIF}
function SwapEndianLongWord(Value: LongWord): LongWord;
{$IF Defined(USE_ASM) and (not Defined(USE_INLINE))}
asm
BSWAP EAX
end;
{$ELSE}
begin
TLongWordRec(Result).Bytes[0] := TLongWordRec(Value).Bytes[3];
TLongWordRec(Result).Bytes[1] := TLongWordRec(Value).Bytes[2];
TLongWordRec(Result).Bytes[2] := TLongWordRec(Value).Bytes[1];
TLongWordRec(Result).Bytes[3] := TLongWordRec(Value).Bytes[0];
end;
{$IFEND}
procedure SwapEndianLongWord(P: PLongWord; Count: LongInt);
{$IFDEF USE_ASM}
asm
@Loop:
MOV ECX, [EAX]
BSWAP ECX
MOV [EAX], ECX
ADD EAX, 4
DEC EDX
JNZ @Loop
end;
{$ELSE}
var
I: LongInt;
Temp: LongWord;
begin
for I := 0 to Count - 1 do
begin
Temp := PLongWordArray(P)[I];
TLongWordRec(PLongWordArray(P)[I]).Bytes[0] := TLongWordRec(Temp).Bytes[3];
TLongWordRec(PLongWordArray(P)[I]).Bytes[1] := TLongWordRec(Temp).Bytes[2];
TLongWordRec(PLongWordArray(P)[I]).Bytes[2] := TLongWordRec(Temp).Bytes[1];
TLongWordRec(PLongWordArray(P)[I]).Bytes[3] := TLongWordRec(Temp).Bytes[0];
end;
end;
{$ENDIF}
type
TCrcTable = array[Byte] of LongWord;
var
CrcTable: TCrcTable;
procedure InitCrcTable;
const
Polynom = $EDB88320;
var
I, J: LongInt;
C: LongWord;
begin
for I := 0 to 255 do
begin
C := I;
for J := 0 to 7 do
begin
if (C and $01) <> 0 then
C := Polynom xor (C shr 1)
else
C := C shr 1;
end;
CrcTable[I] := C;
end;
end;
procedure CalcCrc32(var Crc: LongWord; Data: Pointer; Size: LongInt);
var
I: LongInt;
B: PByte;
begin
B := Data;
for I := 0 to Size - 1 do
begin
Crc := (Crc shr 8) xor CrcTable[B^ xor Byte(Crc)];
Inc(B);
end
end;
procedure FillMemoryByte(Data: Pointer; Size: LongInt; Value: Byte);
{$IFDEF USE_ASM}
asm
PUSH EDI
MOV EDI, EAX
MOV EAX, ECX
MOV AH, AL
MOV CX, AX
SHL EAX, 16
MOV AX, CX
MOV ECX, EDX
SAR ECX, 2
JS @Exit
REP STOSD
MOV ECX, EDX
AND ECX, 3
REP STOSB
POP EDI
@Exit:
end;
{$ELSE}
begin
FillChar(Data^, Size, Value);
end;
{$ENDIF}
procedure FillMemoryWord(Data: Pointer; Size: LongInt; Value: Word);
{$IFDEF USE_ASM}
asm
PUSH EDI
PUSH EBX
MOV EBX, EDX
MOV EDI, EAX
MOV EAX, ECX
MOV CX, AX
SHL EAX, 16
MOV AX, CX
MOV ECX, EDX
SHR ECX, 2
JZ @Word
REP STOSD
@Word:
MOV ECX, EBX
AND ECX, 2
JZ @Byte
MOV [EDI], AX
ADD EDI, 2
@Byte:
MOV ECX, EBX
AND ECX, 1
JZ @Exit
MOV [EDI], AL
@Exit:
POP EBX
POP EDI
end;
{$ELSE}
var
I, V: LongWord;
begin
V := Value * $10000 + Value;
for I := 0 to Size div 4 - 1 do
PLongWordArray(Data)[I] := V;
case Size mod 4 of
1: PByteArray(Data)[Size - 1] := Lo(Value);
2: PWordArray(Data)[Size div 2] := Value;
3:
begin
PWordArray(Data)[Size div 2 - 1] := Value;
PByteArray(Data)[Size - 1] := Lo(Value);
end;
end;
end;
{$ENDIF}
procedure FillMemoryLongWord(Data: Pointer; Size: LongInt; Value: LongWord);
{$IFDEF USE_ASM}
asm
PUSH EDI
PUSH EBX
MOV EBX, EDX
MOV EDI, EAX
MOV EAX, ECX
MOV ECX, EDX
SHR ECX, 2
JZ @Word
REP STOSD
@Word:
MOV ECX, EBX
AND ECX, 2
JZ @Byte
MOV [EDI], AX
ADD EDI, 2
@Byte:
MOV ECX, EBX
AND ECX, 1
JZ @Exit
MOV [EDI], AL
@Exit:
POP EBX
POP EDI
end;
{$ELSE}
var
I: LongInt;
begin
for I := 0 to Size div 4 - 1 do
PLongWordArray(Data)[I] := Value;
case Size mod 4 of
1: PByteArray(Data)[Size - 1] := TLongWordRec(Value).Bytes[0];
2: PWordArray(Data)[Size div 2] := TLongWordRec(Value).Words[0];
3:
begin
PWordArray(Data)[Size div 2 - 1] := TLongWordRec(Value).Words[0];
PByteArray(Data)[Size - 1] := TLongWordRec(Value).Bytes[0];
end;
end;
end;
{$ENDIF}
function GetNumMipMapLevels(Width, Height: LongInt): LongInt;
begin
Result := 0;
if (Width > 0) and (Height > 0) then
begin
Result := 1;
while (Width <> 1) or (Height <> 1) do
begin
Width := Width div 2;
Height := Height div 2;
if Width < 1 then Width := 1;
if Height < 1 then Height := 1;
Inc(Result);
end;
end;
end;
function GetVolumeLevelCount(Depth, MipMaps: LongInt): LongInt;
var
I: LongInt;
begin
Result := Depth;
for I := 1 to MipMaps - 1 do
Inc(Result, ClampInt(Depth shr I, 1, Depth));
end;
function BoundsToRect(X, Y, Width, Height: LongInt): TRect;
begin
Result.Left := X;
Result.Top := Y;
Result.Right := X + Width;
Result.Bottom := Y + Height;
end;
function BoundsToRect(const R: TRect): TRect;
begin
Result.Left := R.Left;
Result.Top := R.Top;
Result.Right := R.Left + R.Right;
Result.Bottom := R.Top + R.Bottom;
end;
function RectToBounds(const R: TRect): TRect;
begin
Result.Left := R.Left;
Result.Top := R.Top;
Result.Right := R.Right - R.Left;
Result.Bottom := R.Bottom - R.Top;
end;
procedure ClipRectBounds(var X, Y, Width, Height: LongInt; const Clip: TRect);
procedure ClipDim(var AStart, ALength: LongInt; ClipMin, ClipMax: LongInt);
begin
if AStart < ClipMin then
begin
ALength := ALength - (ClipMin - AStart);
AStart := ClipMin;
end;
if AStart + ALength > ClipMax then ALength := Max(0, ClipMax - AStart);
end;
begin
ClipDim(X, Width, Clip.Left, Clip.Right);
ClipDim(Y, Height, Clip.Top, Clip.Bottom);
end;
procedure ClipCopyBounds(var SrcX, SrcY, Width, Height, DstX, DstY: LongInt; SrcImageWidth, SrcImageHeight: LongInt; const DstClip: TRect);
procedure ClipDim(var SrcPos, DstPos, Size: LongInt; SrcClipMax,
DstClipMin, DstClipMax: LongInt);
var
OldDstPos: LongInt;
Diff: LongInt;
begin
OldDstPos := Iff(DstPos < 0, DstPos, 0);
if DstPos < DstClipMin then
begin
Diff := DstClipMin - DstPos;
Size := Size - Diff;
if DstPos < SrcPos then
SrcPos := SrcPos + Diff;
DstPos := DstClipMin;
end;
if SrcPos < 0 then
begin
Size := Size + SrcPos - OldDstPos;
DstPos := DstPos - SrcPos + OldDstPos;
SrcPos := 0;
end;
if SrcPos + Size > SrcClipMax then Size := SrcClipMax - SrcPos;
if DstPos + Size > DstClipMax then Size := DstClipMax - DstPos;
end;
begin
ClipDim(SrcX, DstX, Width, SrcImageWidth, DstClip.Left, DstClip.Right);
ClipDim(SrcY, DstY, Height, SrcImageHeight, DstClip.Top, DstClip.Bottom);
end;
procedure ClipStretchBounds(var SrcX, SrcY, SrcWidth, SrcHeight, DstX, DstY,
DstWidth, DstHeight: LongInt; SrcImageWidth, SrcImageHeight: LongInt; const DstClip: TRect);
procedure ClipDim(var SrcPos, DstPos, SrcSize, DstSize: LongInt; SrcClipMax,
DstClipMin, DstClipMax: LongInt);
var
OldSize: LongInt;
Diff: LongInt;
Scale: Single;
begin
Scale := DstSize / SrcSize;
if DstPos < DstClipMin then
begin
Diff := DstClipMin - DstPos;
DstSize := DstSize - Diff;
SrcPos := SrcPos + Round(Diff / Scale);
SrcSize := SrcSize - Round(Diff / Scale);
DstPos := DstClipMin;
end;
if SrcPos < 0 then
begin
SrcSize := SrcSize + SrcPos;
DstPos := DstPos - Round(SrcPos * Scale);
DstSize := DstSize + Round(SrcPos * Scale);
SrcPos := 0;
end;
if SrcPos + SrcSize > SrcClipMax then
begin
OldSize := SrcSize;
SrcSize := SrcClipMax - SrcPos;
DstSize := Round(DstSize * (SrcSize / OldSize));
end;
if DstPos + DstSize > DstClipMax then
begin
OldSize := DstSize;
DstSize := DstClipMax - DstPos;
SrcSize := Round(SrcSize * (DstSize / OldSize));
end;
end;
begin
ClipDim(SrcX, DstX, SrcWidth, DstWidth, SrcImageWidth, DstClip.Left, DstClip.Right);
ClipDim(SrcY, DstY, SrcHeight, DstHeight, SrcImageHeight, DstClip.Top, DstClip.Bottom);
end;
function ScaleRectToRect(const SourceRect, TargetRect: TRect): TRect;
var
SourceWidth: LongInt;
SourceHeight: LongInt;
TargetWidth: LongInt;
TargetHeight: LongInt;
ScaledWidth: LongInt;
ScaledHeight: LongInt;
begin
SourceWidth := SourceRect.Right - SourceRect.Left;
SourceHeight := SourceRect.Bottom - SourceRect.Top;
TargetWidth := TargetRect.Right - TargetRect.Left;
TargetHeight := TargetRect.Bottom - TargetRect.Top;
if SourceWidth * TargetHeight < SourceHeight * TargetWidth then
begin
ScaledWidth := (SourceWidth * TargetHeight) div SourceHeight;
Result := BoundsToRect(TargetRect.Left + ((TargetWidth - ScaledWidth) div 2),
TargetRect.Top, ScaledWidth, TargetHeight);
end
else
begin
ScaledHeight := (SourceHeight * TargetWidth) div SourceWidth;
Result := BoundsToRect(TargetRect.Left, TargetRect.Top + ((TargetHeight - ScaledHeight) div 2),
TargetWidth, ScaledHeight);
end;
end;
function RectInRect(const R1, R2: TRect): Boolean;
begin
Result:=
(R1.Left >= R2.Left) and
(R1.Top >= R2.Top) and
(R1.Right <= R2.Right) and
(R1.Bottom <= R2.Bottom);
end;
function RectIntersects(const R1, R2: TRect): Boolean;
begin
Result :=
not (R1.Left > R2.Right) and
not (R1.Top > R2.Bottom) and
not (R1.Right < R2.Left) and
not (R1.Bottom < R2.Top);
end;
function FormatExceptMsg(const Msg: string; const Args: array of const): string;
begin
Result := Format(Msg + SLineBreak + 'Message: ' + GetExceptObject.Message, Args);
end;
procedure DebugMsg(const Msg: string; const Args: array of const);
var
FmtMsg: string;
begin
FmtMsg := Format(Msg, Args);
{$IFDEF MSWINDOWS}
if IsConsole then
WriteLn('DebugMsg: ' + FmtMsg)
else
MessageBox(GetActiveWindow, PChar(FmtMsg), 'DebugMsg', MB_OK);
{$ENDIF}
{$IFDEF UNIX}
WriteLn('DebugMsg: ' + FmtMsg);
{$ENDIF}
{$IFDEF MSDOS}
WriteLn('DebugMsg: ' + FmtMsg);
{$ENDIF}
end;
initialization
InitCrcTable;
{$IFDEF MSWINDOWS}
QueryPerformanceFrequency(PerfFrequency);
InvPerfFrequency := 1.0 / PerfFrequency;
{$ENDIF}
{$IFDEF MSDOS}
// reset PIT
asm
MOV EAX, $34
OUT $43, AL
XOR EAX, EAX
OUT $40, AL
OUT $40, AL
end;
{$ENDIF}
{
File Notes:
-- TODOS ----------------------------------------------------
- nothing now
-- 0.23 Changes/Bug Fixes -----------------------------------
- Added RectInRect and RectIntersects functions
- Added some string utils: StrToken, StrTokenEnd, PosEx, PosNoCase.
- Moved BuildFileList here from DemoUtils.
-- 0.21 Changes/Bug Fixes -----------------------------------
- Moved GetVolumeLevelCount from ImagingDds here.
- Renamed FillMemory to FillMemoryByte to avoid name collision in C++ Builder.
- Added Iff function for Char, Pointer, and Int64 types.
- Added IsLittleEndian function.
- Added array types for TWordRec, TLongWordRec, and TInt64Rec.
- Added MatchFileNameMask function.
-- 0.19 Changes/Bug Fixes -----------------------------------
- added ScaleRectToRect (thanks to Paul Michell)
- added BoundsToRect, ClipBounds, ClipCopyBounds, ClipStretchBounds functions
- added MulDiv function
- FreeAndNil is not inline anymore - caused AV in one program
-- 0.17 Changes/Bug Fixes -----------------------------------
- GetAppExe didn't return absolute path in FreeBSD, fixed
- added debug message output
- fixed Unix compatibility issues (thanks to Ales Katona).
Imaging now compiles in FreeBSD and maybe in other Unixes as well.
-- 0.15 Changes/Bug Fixes -----------------------------------
- added some new utility functions
-- 0.13 Changes/Bug Fixes -----------------------------------
- added many new utility functions
- minor change in SwapEndian to avoid range check error
}
end.
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