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| Type mByte = ^Byte;
Type TPNGHeader = Record
signature: Integer;
version: Integer;
End;
Type TPNGBlockSignatures = Record
Const _IHDR: Cardinal = $49484452;
Const _PLTE: Cardinal = $504c5445;
Const _IDAT: Cardinal = $49444154;
Const _pHys: Cardinal = $70485973;
Const _iCCP: Cardinal = $69434350;
Const _cHRM: Cardinal = $6348524d;
Const _IEND: Cardinal = $49454e44;
End;
Type TPNGBlock = Record
_Size: Cardinal;
_Type: Cardinal;
_Data: mByte;
_CRC: Cardinal;
End;
Type TPNGImage = Record
_Signature: Cardinal;
_Version: Cardinal;
_Width: Cardinal;
_Height: Cardinal;
_Depth: Byte;
_Color: Byte;
_Compression: Byte;
_Filter: Byte;
_Interlace: Byte;
_SBuf: mByte;
_SSize: Cardinal;
_PBuf: mByte;
_PSize: Cardinal;
Procedure Initialize;
Procedure Finishing;
End;
procedure TPNGImage.Finishing;
begin
if Not (_SBuf = Nil) then
FreeMem(_SBuf);
_SSize := 0;
if Not (_PBuf = Nil) then
FreeMem(_PBuf);
_PSize := 0;
Initialize;
end;
procedure TPNGImage.Initialize;
begin
_Signature := 0;
_Version := 0;
_Width := 0;
_Height := 0;
_Depth := 0;
_Color := 0;
_Compression := 0;
_Filter := 0;
_Interlace := 0;
_SBuf := Nil;
_SSize := 0;
_PBuf := Nil;
_PSize := 0;
end;
Function TAnimations.TAnimationLoader.LoadAsPngFile(const FileBufAddr: mByte; Const FileBufSize: Cardinal): Boolean;
Procedure ChangeEndian(Const pN: Pointer; Const sN: Integer);
Var l, r, c: mByte;
Var i: Integer;
Begin
GetMem(c,sN);
Move(pN^,c^,sN);
l := pN;
r := c;
Inc(R,sN-1);
for I := 1 to sN do
Begin
l^ := r^;
Inc(l);
Dec(r);
End;
FreeMem(c,SizeOf(SN));
End;
Function PaethPredictor(a, b, c: Byte): Byte;
var
pa, pb, pc: Integer;
begin
{ a = left, b = above, c = upper left }
pa := abs(b - c); { distances to a, b, c }
pb := abs(a - c);
pc := abs(a + b - c * 2);
{ return nearest of a, b, c, breaking ties in order a, b, c }
if (pa <= pb) and (pa <= pc)
then Result := a
else
if pb <= pc
then Result := b
else Result := c;
end;
Const Starting_Row: Array [1..8] Of Byte = (0,1,0,2,0,4,0,0);
Const Starting_Col: Array [1..8] Of Byte = (0,0,1,0,2,0,4,0);
Const Row_Increment: Array [1..8] Of Byte = (1,2,2,4,4,8,8,8);
Const Col_Increment: Array [1..8] Of Byte = (1,1,2,2,4,4,8,8);
Const Block_Height: Array [1..8] Of Byte = (1,1,2,2,4,4,8,8);
Const Block_Width: Array [1..8] Of Byte = (1,1,1,2,2,4,4,8);
Var uSize: Integer;
Var x,y,z: Cardinal;
Var uData,uIndex,PNGIndex,PLTEIndex: mByte;
Var InterlaceLevel,SampleSize,SampleIndex,Filter,r,g,b,a: Byte;
Var PNGImage: TPNGImage;
Var PNGBlock: TPNGBlock;
Var rPos: mByte;
Var s: File Of Byte;
begin
Result := False;
PNGImage.Initialize;
PNGBlock._Data := Nil;
uData := Nil;
rPos := FileBufAddr;
Move(rPos^,PNGImage._Signature,SizeOf(PNGImage._Signature));
Inc(rPos,SizeOf(PNGImage._Signature));
Move(rPos^,PNGImage._Version,SizeOf(PNGImage._Version));
Inc(rPos,SizeOf(PNGImage._Version));
while (Cardinal(rPos) < Cardinal(FileBufAddr)+FileBufSize) do
Begin
Move(rPos^,PNGBlock._Size,SizeOf(PNGBlock._Size));
Inc(rPos,SizeOf(PNGBlock._Size));
ChangeEndian(@PNGBlock._Size, SizeOf(PNGBlock._Size));
Move(rPos^,PNGBlock._Type,SizeOf(PNGBlock._Type));
Inc(rPos, SizeOf(PNGBlock._Type));
ChangeEndian(@PNGBlock._Type, SizeOf(PNGBlock._Type));
ReallocMem(PNGBlock._Data,PNGBlock._Size);
Move(rPos^,PNGBlock._Data^,PNGBlock._Size);
Inc(rPos, PNGBlock._Size);
Move(rPos^,PNGBlock._CRC,SizeOf(PNGBlock._CRC));
Inc(rPos,SizeOf(PNGBlock._CRC));
ChangeEndian(@PNGBlock._CRC, SizeOf(PNGBlock._CRC));
if PNGBlock._Type = TPNGBlockSignatures._IHDR then
Begin
Move(PNGBlock._Data^,PNGImage._Width,SizeOf(PNGImage._Width));
ChangeEndian(@PNGImage._Width, SizeOf(PNGImage._Width));
Inc(PNGBlock._Data, SizeOf(PNGImage._Width));
Move(PNGBlock._Data^,PNGImage._Height,SizeOf(PNGImage._Height));
ChangeEndian(@PNGImage._Height, SizeOf(PNGImage._Height));
Inc(PNGBlock._Data, SizeOf(PNGImage._Height));
Move(PNGBlock._Data^,PNGImage._Depth,SizeOf(PNGImage._Depth));
Inc(PNGBlock._Data, SizeOf(PNGImage._Depth));
Move(PNGBlock._Data^,PNGImage._Color,SizeOf(PNGImage._Color));
Inc(PNGBlock._Data, SizeOf(PNGImage._Color));
Move(PNGBlock._Data^,PNGImage._Compression,SizeOf(PNGImage._Compression));
Inc(PNGBlock._Data, SizeOf(PNGImage._Compression));
Move(PNGBlock._Data^,PNGImage._Filter,SizeOf(PNGImage._Filter));
Inc(PNGBlock._Data, SizeOf(PNGImage._Filter));
Move(PNGBlock._Data^,PNGImage._Interlace,SizeOf(PNGImage._Interlace));
Inc(PNGBlock._Data, SizeOf(PNGImage._Interlace));
Dec(PNGBlock._Data,PNGBlock._Size);
Continue;
End;
if PNGBlock._Type = TPNGBlockSignatures._IDAT then
Begin
if PNGImage._SBuf = Nil then
Begin
New(PNGImage._SBuf);
PNGImage._SSize := 0;
End;
ReallocMem(PNGImage._SBuf,PNGImage._SSize+PNGBlock._Size);
Inc(PNGImage._SBuf,PNGImage._SSize);
Move(PNGBlock._Data^,PNGImage._SBuf^,PNGBlock._Size);
Dec(PNGImage._SBuf,PNGImage._SSize);
Inc(PNGImage._SSize,PNGBlock._Size);
Continue;
End;
if PNGBlock._Type = TPNGBlockSignatures._PLTE then
Begin
if PNGImage._PBuf = Nil then
Begin
New(PNGImage._PBuf);
PNGImage._PSize := 0;
End;
ReallocMem(PNGImage._PBuf,PNGImage._PSize+PNGBlock._Size);
Inc(PNGImage._PBuf,PNGImage._PSize);
Move(PNGBlock._Data^,PNGImage._PBuf^,PNGBlock._Size);
Dec(PNGImage._PBuf,PNGImage._PSize);
Inc(PNGImage._PSize,PNGBlock._Size);
Continue;
End;
End;
zLibEx.ZDecompress2(Pointer(PNGImage._SBuf),PNGImage._SSize,Pointer(uData),uSize,0);
if uSize < 0 then
Begin
Animation.Info := 'Не удалось распаковать блок IDAT файла '+Animation._File;
PNGImage.Finishing;
Exit;
End;
FreeMemory(PNGImage._SBuf);
PNGImage._SBuf := uData;
PNGImage._SSize := uSize;
uData := nil;
If (PNGImage._Color = 0) and (PNGImage._Depth in [1,2,4])
Then
Begin
PNGImage.Finishing;
Animation.Info := 'Неподдерживаемый формат PNG изображения.';
Exit;
End // GrayScale 1 2 4
else
If (PNGImage._Color = 0) and (PNGImage._Depth = 8)
Then Begin SampleSize := 1; End // GrayScale 8
else
If (PNGImage._Color = 0) and (PNGImage._Depth = 16)
Then Begin SampleSize := 2; End // GrayScale 16
else
If (PNGImage._Color = 2) and (PNGImage._Depth = 8)
Then Begin SampleSize := 3; End // Red + Green + Blue 8
else
If (PNGImage._Color = 2) and (PNGImage._Depth = 16)
Then Begin SampleSize := 6; End // Red + Green + Blue 16
Else
If (PNGImage._Color = 3) and (PNGImage._Depth = 8)
Then Begin
SampleSize := 1; End // Indexed RGB 8
Else
If (PNGImage._Color = 4) and (PNGImage._Depth = 8)
Then Begin SampleSize := 2; End // GrayScale + Alpha 8
else
If (PNGImage._Color = 4) and (PNGImage._Depth = 16)
Then Begin SampleSize := 4; End // GrayScale + Alpha 16
else
If (PNGImage._Color = 6) and (PNGImage._Depth = 8)
Then Begin SampleSize := 4; End // Red + Green + Blue + Alpha 8
else
If (PNGImage._Color = 6) and (PNGImage._Depth = 16)
Then Begin SampleSize := 8; End // Red + Green + Blue + Alpha 16
else
Begin
Animation.Info := 'Неподдерживаемый цветовой набор.';
PNGImage.Finishing;
Exit;
End;
Case PNGImage._Interlace of
0: InterlaceLevel := 1;
1: InterlaceLevel := 8;
else
Begin
Animation.Info := 'Неподдерживаемый черезстрочный режим.';
PNGImage.Finishing;
Exit;
End;
End;
uSize := PNGImage._Width*PNGImage._Height*SampleSize;
ReallocMem(uData,uSize);
FillMemory(uData,uSize,$0);
PNGIndex := PNGImage._SBuf;
while InterlaceLevel > 0 do
Begin
if (InterlaceLevel = 1) and (PNGImage._Interlace = 1) then
Begin
Dec(InterlaceLevel);
Continue;
End;
uIndex := uData;
Inc(uIndex, (Starting_Col[InterlaceLevel]*SampleSize+Starting_Row[InterlaceLevel]*PNGImage._Width*SampleSize));
y := Starting_Row[InterlaceLevel];
while (y < PNGImage._Height) do
Begin
Filter := PNGIndex^;
Inc(PNGIndex,1);
x := Starting_Col[InterlaceLevel];
while (X < PNGImage._Width) do
Begin
for SampleIndex := 1 to SampleSize do
Begin
Case Filter Of
0: // None Filter
Begin
uIndex^ := PNGIndex^;
End;
1: // Sub Filter
Begin
if x < Col_Increment[InterlaceLevel]
Then uIndex^ := PNGIndex^
Else uIndex^ := (PNGIndex^+Byte(Pointer(Cardinal(uIndex)-SampleSize*Col_Increment[InterlaceLevel])^));
End;
2: // Up Filter
Begin
if y < Row_Increment[InterlaceLevel]
Then uIndex^ := PNGIndex^
Else uIndex^ := PNGIndex^+Byte(Pointer(Cardinal(uIndex)-PNGImage._Width*SampleSize*Row_Increment[InterlaceLevel])^);
End;
3: // Average Filter
Begin
if x < Col_Increment[InterlaceLevel]
then
if y < Row_Increment[InterlaceLevel]
then uIndex^ := PNGIndex^
Else uIndex^ := PNGIndex^+((Byte(Pointer(Cardinal(uIndex)-PNGImage._Width*SampleSize*Row_Increment[InterlaceLevel])^)) div 2)
Else
if y < Row_Increment[InterlaceLevel]
then uIndex^ := PNGIndex^+((Byte(Pointer(Cardinal(uIndex)-SampleSize*Col_Increment[InterlaceLevel])^)) div 2)
Else uIndex^ := PNGIndex^+((Byte(Pointer(Cardinal(uIndex)-PNGImage._Width*SampleSize*Row_Increment[InterlaceLevel])^)+Byte(Pointer(Cardinal(uIndex)-SampleSize*Col_Increment[InterlaceLevel])^)) div 2);
End;
4: // Paeth Filter
Begin
if x < Col_Increment[InterlaceLevel]
then
Begin
if y < Row_Increment[InterlaceLevel]
then uIndex^ := PNGIndex^+ PaethPredictor($0,$0,$0)
Else uIndex^ := PNGIndex^+ PaethPredictor($0,Byte(Pointer(Cardinal(uIndex)-PNGImage._Width*SampleSize*Row_Increment[InterlaceLevel])^),$0)
End
Else
Begin
if y < Row_Increment[InterlaceLevel]
then uIndex^ := PNGIndex^ + PaethPredictor(Byte(Pointer(Cardinal(uIndex)-SampleSize*Col_Increment[InterlaceLevel])^),$0,$0)
Else uIndex^ := PNGIndex^+ PaethPredictor(Byte(Pointer(Cardinal(uIndex)-SampleSize*Col_Increment[InterlaceLevel])^),Byte(Pointer(Cardinal(uIndex)-PNGImage._Width*SampleSize*Row_Increment[InterlaceLevel])^),Byte(Pointer(Cardinal(uIndex)-PNGImage._Width*SampleSize*Row_Increment[InterlaceLevel]-SampleSize*Col_Increment[InterlaceLevel])^))
End;
End;
else
Begin
ReportMessage := 'Недопустимый тип фильтрации - '+IntToHex(Filter,2);
PNGImage.Finishing;
Exit;
End;
End; // case filter end
Inc(PNGIndex,1);
Inc(uIndex,1);
End; // for SampleIndex end
Inc(uIndex, SampleSize*(Col_Increment[InterlaceLevel]-1));
Inc(X,Col_Increment[InterlaceLevel]);
End; // for x end
Inc(Y,Row_Increment[InterlaceLevel]);
uIndex := uData;
Inc(uIndex,(y*SampleSize*(PNGImage._Width)+Starting_Col[InterlaceLevel]*SampleSize));
End; // for y end
Dec(InterlaceLevel);
End;
ReallocMem(PNGImage._SBuf, PNGImage._Width*PNGImage._Height*4);
// FillMemory(PNGImage._SBuf, PNGImage._Width*PNGImage._Height*4,$0);
Case PNGImage._Color of
0: // Grayscale
Begin
Case PNGImage._Depth of
8: // 8Bit
Begin
uIndex := uData;
for Y := PNGImage._Height Downto 1 do
Begin
PNGIndex := PNGImage._SBuf;
Inc(PNGIndex,(y-1)*PNGImage._Width*4);
for X := 1 to PNGImage._Width do
Begin
PNGIndex^ := uIndex^; Inc(PNGIndex);
PNGIndex^ := uIndex^; Inc(PNGIndex);
PNGIndex^ := uIndex^; Inc(PNGIndex);
PNGIndex^ := $FF; Inc(PNGIndex); Inc(uIndex);
End;
End;
FreeMemory(uData);
uData := Nil;
End;
16: // 16Bit
Begin
uIndex := uData;
for Y := PNGImage._Height Downto 1 do
Begin
PNGIndex := PNGImage._SBuf;
Inc(PNGIndex,(y-1)*PNGImage._Width*4);
for X := 1 to PNGImage._Width do
Begin
PNGIndex^ := uIndex^; Inc(PNGIndex);
PNGIndex^ := uIndex^; Inc(PNGIndex);
PNGIndex^ := uIndex^; Inc(PNGIndex);
PNGIndex^ := $FF; Inc(PNGIndex); Inc(uIndex,2);
End;
End;
FreeMemory(uData);
uData := Nil;
End;
else // Ошибка
Begin
ReportMessage := ('Неподдерживаемая глубина Grayscale-изображения.'+sLineBreak+
'ColorSet: '+ IntToStr(PNGImage._Color)+sLineBreak+
'DepthSet: '+ IntToStr(PNGImage._Depth));
PNGImage.Finishing;
Exit;
End;
End;
End;
2: // Red + Green + Blue
Begin
Case PNGImage._Depth of
8: // 8Bit
Begin
PNGIndex := PNGImage._SBuf;
uIndex := uData;
for Y := 1 to PNGImage._Height do
for X := 1 to PNGImage._Width do
Begin
PNGIndex^ := uIndex^; Inc(PNGIndex); Inc(uIndex);
PNGIndex^ := uIndex^; Inc(PNGIndex); Inc(uIndex);
PNGIndex^ := uIndex^; Inc(PNGIndex); Inc(uIndex);
PNGIndex^ := $FF; Inc(PNGIndex);;
End;
FreeMemory(uData);
uData := Nil;
End;
16: // 16Bit
Begin
uIndex := uData;
for Y := PNGImage._Height Downto 1 do
Begin
PNGIndex := PNGImage._SBuf;
Inc(PNGIndex,(y-1)*PNGImage._Width*4);
for X := 1 to PNGImage._Width do
Begin
PNGIndex^ := uIndex^; Inc(PNGIndex); Inc(uIndex,2);
PNGIndex^ := uIndex^; Inc(PNGIndex); Inc(uIndex,2);
PNGIndex^ := uIndex^; Inc(PNGIndex); Inc(uIndex,2);
PNGIndex^ := $FF; Inc(PNGIndex);
End;
End;
FreeMemory(uData);
uData := Nil;
End;
else // Ошибка
Begin
ReportMessage := ('Неподдерживаемая глубина RGB-изображения.'+sLineBreak+
'ColorSet: '+ IntToStr(PNGImage._Color)+sLineBreak+
'DepthSet: '+ IntToStr(PNGImage._Depth));
PNGImage.Finishing;
Exit;
End;
End; //Case PNGImage._Depth
End;
3: // Indexed RGB
Begin
Case PNGImage._Depth of
8: // 8Bit
Begin
PNGIndex := PNGImage._SBuf;
uIndex := uData;
for Y := 1 to PNGImage._Height do
for X := 1 to PNGImage._Width do
Begin
PLTEIndex := PNGImage._PBuf;
Inc(PLTEIndex,uIndex^*3);
PNGIndex^ := PLTEIndex^; Inc(PNGIndex); Inc(PLTEIndex);
PNGIndex^ := PLTEIndex^; Inc(PNGIndex); Inc(PLTEIndex);
PNGIndex^ := PLTEIndex^; Inc(PNGIndex);
PNGIndex^ := $ff; Inc(PNGIndex);
Inc(uIndex);
End;
FreeMemory(uData);
uData := Nil;
End;
else // Ошибка
Begin
ReportMessage := ('Неподдерживаемая глубина IndexedRGB-изображения.'+sLineBreak+
'ColorSet: '+ IntToStr(PNGImage._Color)+sLineBreak+
'DepthSet: '+ IntToStr(PNGImage._Depth));
PNGImage.Finishing;
Exit;
End;
End;
End;
4: // GrayScale + Alpha
Begin
Case PNGImage._Depth of
8: // 8Bit
Begin
uIndex := uData;
for Y := PNGImage._Height Downto 1 do
Begin
PNGIndex := PNGImage._SBuf;
Inc(PNGIndex,(y-1)*PNGImage._Width*4);
for X := 1 to PNGImage._Width do
Begin
PNGIndex^ := uIndex^; Inc(PNGIndex);
PNGIndex^ := uIndex^; Inc(PNGIndex);
PNGIndex^ := uIndex^; Inc(PNGIndex); Inc(uIndex);
PNGIndex^ := uIndex^; Inc(PNGIndex); Inc(uIndex);
End;
End;
FreeMemory(uData);
uData := Nil;
End;
16: // 16Bit
Begin
uIndex := uData;
for Y := PNGImage._Height Downto 1 do
Begin
PNGIndex := PNGImage._SBuf;
Inc(PNGIndex,(y-1)*PNGImage._Width*4);
for X := 1 to PNGImage._Width do
Begin
PNGIndex^ := uIndex^; Inc(PNGIndex);
PNGIndex^ := uIndex^; Inc(PNGIndex);
PNGIndex^ := uIndex^; Inc(PNGIndex); Inc(uIndex,2);
PNGIndex^ := uIndex^; Inc(PNGIndex); Inc(uIndex,2);
End;
End;
FreeMemory(uData);
uData := Nil;
End;
else // Ошибка
Begin
ReportMessage := ('Неподдерживаемая глубина GrayscaleAlpha-изображения.'+sLineBreak+
'ColorSet: '+ IntToStr(PNGImage._Color)+sLineBreak+
'DepthSet: '+ IntToStr(PNGImage._Depth));
PNGImage.Finishing;
Exit;
End;
End; //Case PNGImage._Depth
End;
6: // Red + Green + Blue + Alpha
Begin
Case PNGImage._Depth of
8: // 8Bit
Begin
uIndex := uData;
for Y := PNGImage._Height Downto 1 do
Begin
PNGIndex := PNGImage._SBuf;
Inc(PNGIndex,(y-1)*PNGImage._Width*4);
for X := 1 to PNGImage._Width do
Begin
PNGIndex^ := uIndex^; Inc(PNGIndex); Inc(uIndex);
PNGIndex^ := uIndex^; Inc(PNGIndex); Inc(uIndex);
PNGIndex^ := uIndex^; Inc(PNGIndex); Inc(uIndex);
PNGIndex^ := uIndex^; Inc(PNGIndex); Inc(uIndex);
End;
End;
FreeMemory(uData);
uData := Nil;
End;
16: // 16Bit
Begin
uIndex := uData;
for Y := PNGImage._Height Downto 1 do
Begin
PNGIndex := PNGImage._SBuf;
Inc(PNGIndex,(y-1)*PNGImage._Width*4);
for X := 1 to PNGImage._Width do
Begin
PNGIndex^ := uIndex^; Inc(PNGIndex); Inc(uIndex,2);
PNGIndex^ := uIndex^; Inc(PNGIndex); Inc(uIndex,2);
PNGIndex^ := uIndex^; Inc(PNGIndex); Inc(uIndex,2);
PNGIndex^ := uIndex^; Inc(PNGIndex); Inc(uIndex,2);
End;
End;
FreeMemory(uData);
uData := Nil;
End;
else // Ошибка
Begin
ReportMessage := ('Неподдерживаемая глубина RGBA-изображения.'+sLineBreak+
'ColorSet: '+ IntToStr(PNGImage._Color)+sLineBreak+
'DepthSet: '+ IntToStr(PNGImage._Depth));
PNGImage.Finishing;
Exit;
End;
End; //Case PNGImage._Depth
End;
Else // Ошибка
Begin
ReportMessage := ('Неподдерживаемая цветность изображения.'+sLineBreak+
'ColorSet: '+ IntToStr(PNGImage._Color)+sLineBreak+
'DepthSet: '+ IntToStr(PNGImage._Depth));
PNGImage.Finishing;
Exit;
End;
End; // Case PNGImage._Color
Animation.Width := PNGImage._Width;
Animation.Height := PNGImage._Height;
Animation.StartX := 0;
Animation.StartY := 0;
if (LenGth(Animation.Frames) = 0) or
(Animated) then SetLenGth(Animation.Frames,LenGth(Animation.Frames)+1);
Animation.Frames[High(Animation.Frames)].RAWTexture := PNGImage._SBuf;
Animation.Frames[High(Animation.Frames)].ALPHATexture := -1;
Animation.Frames[High(Animation.Frames)].RGBATexture := -1;
PNGImage._SBuf := Nil;
Result := True;
PNGImage.Finishing;
end; |
(
