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|
Function TGLZBitmapBMPImage.GetHeaderRedMask: LongWord;
Begin
if FHeaderType>= bmpht_WindowsV2 then
begin
Case FHeaderType Of
bmpht_WindowsV2: Result := LEToN(FInfoHeader.WindowsV2.biRedMask);
bmpht_WindowsV3: Result := LEToN(FInfoHeader.WindowsV3.biRedMask);
bmpht_WindowsV4: Result := LEToN(FInfoHeader.WindowsV4.biRedMask);
bmpht_WindowsV5: Result := LEToN(FInfoHeader.WindowsV5.biRedMask);
End;
end
else
begin
{$ifdef ENDIAN_BIG}
Result := $0000FF00;
{$else}
Result :=$00FF0000;
{$endif}
end;
End;
Function TGLZBitmapBMPImage.GetHeaderGreenMask: LongWord;
Begin
if FHeaderType>= bmpht_WindowsV2 then
begin
Case FHeaderType Of
bmpht_WindowsV2: Result := LEToN(FInfoHeader.WindowsV2.biGreenMask);
bmpht_WindowsV3: Result := LEToN(FInfoHeader.WindowsV3.biGreenMask);
bmpht_WindowsV4: Result := LEToN(FInfoHeader.WindowsV4.biGreenMask);
bmpht_WindowsV5: Result := LEToN(FInfoHeader.WindowsV5.biGreenMask);
End;
end
else
begin
{$ifdef ENDIAN_BIG}
Result := $00FF0000;
{$else}
Result := $0000FF00;
{$endif}
end;
End;
Function TGLZBitmapBMPImage.GetHeaderBlueMask: LongWord;
Begin
if FHeaderType>= bmpht_WindowsV2 then
begin
Case FHeaderType Of
bmpht_WindowsV2: Result := LEToN(FInfoHeader.WindowsV2.biBlueMask);
bmpht_WindowsV3: Result := LEToN(FInfoHeader.WindowsV3.biBlueMask);
bmpht_WindowsV4: Result := LEToN(FInfoHeader.WindowsV4.biBlueMask);
bmpht_WindowsV5: Result := LEToN(FInfoHeader.WindowsV5.biBlueMask);
End;
end
else
begin
{$ifdef ENDIAN_BIG}
Result := $00FF0000;
{$else}
Result := $000000FF;
{$endif}
end;
End;
Function TGLZBitmapBMPImage.GetHeaderAlphaMask: LongWord;
Begin
if FHeaderType>= bmpht_WindowsV3 then
begin
Case FHeaderType Of
bmpht_WindowsV3: Result := LEToN(FInfoHeader.WindowsV3.biAlphaMask);
bmpht_WindowsV4: Result := LEToN(FInfoHeader.WindowsV4.biAlphaMask);
bmpht_WindowsV5: Result := LEToN(FInfoHeader.WindowsV5.biAlphaMask);
Else Result:=0
End;
end
else
begin
{$ifdef ENDIAN_BIG}
Result := $000000FF;
{$else}
Result := $FF000000;
{$endif}
end;
End;
...
function TGLZBitmapBMPImage.ReadImageProperties:Boolean;
function GetMaskShift(AMask: LongWord): ShortInt;
begin
Result := 0;
while ((AMask and (1 shl Result)) = 0) and (Result < 32) do inc(Result);
// if result = 32 then result:=0;
end;
function GetMaskSize(AMask: LongWord; AShift:ShortInt): Byte;
begin
Result := 0;
while (AShift + Result < 32) and ((AMask and (1 shl (AShift + Result))) <> 0) do Inc(Result);
end;
begin
...
{ On a récupéré nos informations, on met à jour le RawImage. de TGLZBitmap
On charge la palette de couleur si besoins
On initialise quelques variables utiles pour la lecture des données suivant
le "PixelFormat"
}
With RawImage do
begin
UsedColors:=GetHeaderUsedColors;
UsePalette:=False;
With Description do
begin
// Le decalage par defaut pour le bitfield est le format de couleur (A)RGB
(*RedShift := 16;
GreenShift := 8;
BlueShift := 24;
AlphaShift :=0;RedMaskSize := 8;
GreenMaskSize := 8;// Taille de valeur en Bit
BlueMaskSize := 8;
AlphaMaskSize := 8;*)
// On Initialise le format de couleur gràce au "masque"
// Format couleur par Defaut pour le BitField : ARGB
RedMask := GetHeaderRedMask;
GreenMask := GetHeaderGreenMask;
BlueMask := GetHeaderBlueMask;
RedShift := GetMaskShift(RedMask); //ShiftCount(RedMask);
GreenShift := GetMaskShift(GreenMask);
BlueShift := GetMaskShift(BlueMask);
RedMaskSize := GetMaskSize(RedMask,RedShift);
GreenMaskSize := GetMaskSize(GreenMask,GreenShift);
BlueMaskSize := GetMaskSize(BlueMask,BlueShift);
AlphaMask := 0; //GetMaskSize(AlphaMask);
AlphaShift := 0;
AlphaMaskSize :=0;
if FHeaderType>bmpht_WindowsV2 then
begin
AlphaMask := GetHeaderAlphaMask;
AlphaShift := GetMaskShift(AlphaMask);
AlphaMaskSize := GetMaskSize(AlphaMask,AlphaShift);
end
else
begin // En-tête Version 1, on initialise avec la valeur par defaut
if BitCount = 32 then
begin
{$ifdef ENDIAN_BIG}
AlphaMask := := $000000FF;
{$else}
AlphaMask := $FF000000;
{$endif}
AlphaShift := GetMaskShift(AlphaMask);
AlphaMaskSize := GetMaskSize(AlphaMask,AlphaShift);
end;
end;
end;
...
FRowSize:=ComputeBytesPerLine(bmpWidth, bitCount, bleDWordBoundary);
Case bitCount of
...
32:
begin
Description.ColorFormat:=cfBGRA;
if Not(Compression=BMP_COMPRESSION_NONE) and not(Compression=BMP_COMPRESSION_BITF) then
begin
ShowMessage('Bad Compression');
Result:=False;
end;
if Description.AlphaMaskSize > 0 then
begin
// Le Mask Alpha cache-t-il une autre composante de la couleur
if (Description.RedMask or Description.GreenMask or Description.BlueMask) and Description.AlphaMask <> 0 then
begin
Description.AlphaMask := 0;
Description.AlphaShift := 0;
Description.AlphaMaskSize := 0;
end;
end;
// La taille du masque alpha est 0,. C'est un format 24bits.
if Description.AlphaMaskSize = 0 then
begin
//Description.ColorFormat:=cfBGR;
BitCount:=24;//
Description.AlphaMask := $FF000000;
Description.AlphaShift := 0;//GetMaskShift(Description.AlphaMask);
// if Description.AlphaShift = 24 then Description.AlphaShift := 0;
end;
end;
end;
procedure TGLZBitmapBMPImage.LoadFromMemory();
var
YY,Y : Integer;
X:Integer;
DstColor: TGLZColor;
SrcPtr : PLongWord;
DstLine : PGLZColor;
SrcColor :LongWord;
LineBuffer : PByte;
function ExpandColor(Value: LongWord): TGLZColor;
var
tmpr, tmpg, tmpb, tmpa: LongWord;
begin
tmpr := value and RawImage.Description.RedMask;
tmpg := value and RawImage.Description.GreenMask;
tmpb := value and RawImage.Description.BlueMask;
tmpa := value and RawImage.Description.AlphaMask;
Result.Alpha := 255;
if RawImage.Description.RedShift < 0 then
Result.Red := byte(tmpr shl (-RawImage.Description.RedShift))
else
Result.Red := byte(tmpr shr RawImage.Description.RedbitShift);
if RawImage.Description.GreenShift < 0 then
Result.Green := byte(tmpg shl (-RawImage.Description.GreenShift))
else
Result.Green := byte(tmpg shr RawImage.Description.GreenShift);
if RawImage.Description.BluebitShift < 0 then
Result.Blue := byte(tmpb shl (-RawImage.Description.BlueShift))
else
Result.Blue := byte(tmpb shr RawImage.Description.BlueShift);
if RawImage.Description.AlphaMaskSize>0 then
begin
if RawImage.Description.AlphaShift < 0 then
Result.Alpha := byte(tmpa shl (-RawImage.Description.AlphaShift))
else
Result.Alpha := byte(tmpa shr RawImage.Description.AlphaShift);
end;
end;
begin
// On initialise les dimensions de notre bitmap
SetSize(bmpWidth, bmpHeight);
Case RawImage.Description.PixelFormat of
...
pf32Bits: // Pas de compression, formats couleurs suivant "BitField" sinon RGBA
begin
LineBuffer:=nil;
ReallocMem(LineBuffer,FRowSize);
Y:=0;
repeat
Memory.Read(LineBuffer^,FRowSize);
if TopDown then YY:=Y else YY:=MaxHeight-Y;
if (Compression = BMP_COMPRESSION_BITF) then //LineDecodeBITFIELD32
begin
DstLine:=GetScanLine(YY);
SrcPtr := PLongWord(LineBuffer);
For X:=0 to MaxWidth do
begin
SrcColor:=(SrcPtr+X)^;
DstColor := ExpandColor(SrcColor);
if (FHeaderType<bmpht_WindowsV3) then DstColor.Alpha:=255;
DstLine^:=DstColor;
Inc(DstLine);
end;
end else LineDecodeBGRA32(LineBuffer,YY,false);
Inc(Y);
Until (Y>MaxHeight);
ReAllocMem(LineBuffer, 0);
FreeMem(LineBuffer);
LineBuffer:=nil;
end;
end;
end; |
Fichier BMP et encodage "BITFIELD"
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