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bgrareadpng.pas
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bgrareadpng.pas
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{
The original file before tweaking is:
$Id: fpreadpng.pp,v 1.10 2003/10/19 21:09:51 luk Exp $
This file is part of the Free Pascal run time library.
Copyright (c) 2003 by the Free Pascal development team
PNG reader implementation
See the file COPYING.FPC, included in this distribution,
for details about the copyright.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
**********************************************************************
Optimisations applied:
- using "const" parameter for TColorData
- direct pixel access with TBGRABitmap when possible
- some fixes of hints and of initializations
- vertical shrink option with MinifyHeight, OriginalHeight and VerticalShrinkFactor (useful for thumbnails)
}
{$i bgrabitmap.inc}{$H+}
unit BGRAReadPng;
interface
uses
SysUtils,Classes, BGRATypes, FPImage, FPImgCmn, PNGComn, {$IFNDEF FPC}Types, GraphType,{$ENDIF}
{$IFDEF FPC}ZStream,{$ELSE}ZLib,{$ENDIF}BGRAGraphics, BGRABitmapTypes;
Type
TSetPixelProc = procedure (x,y:integer; const CD : TColordata) of object;
TConvertColorProc = function (const CD:TColorData) : TFPColor of object;
TBGRAConvertColorProc = function (const CD:TColorData) : TBGRAPixel of object;
THandleScanLineProc = procedure (const y : integer; const ScanLine : PByteArray) of object;
{ TBGRAReaderPNG }
TBGRAReaderPNG = class (TBGRAImageReader)
private
FHeader : THeaderChunk;
ZData : TMemoryStream; // holds compressed data until all blocks are read
Decompress : TDeCompressionStream; // decompresses the data
FPltte : boolean; // if palette is used
FCountScanlines : EightLong; //Number of Scanlines to process for each pass
FScanlineLength : EightLong; //Length of Scanline for each pass
FCurrentPass : byte;
ByteWidth : byte; // number of bytes to read for pixel information
BitsUsed : EightLong; // bitmasks to use to split a byte into smaller parts
BitShift : byte; // shift right to do of the bits extracted with BitsUsed for 1 element
CountBitsUsed : byte; // number of bit groups (1 pixel) per byte (when bytewidth = 1)
//CFmt : TColorFormat; // format of the colors to convert from
StartX,StartY, DeltaX,DeltaY, StartPass,EndPass : integer; // number and format of passes
FPalette : TFPPalette;
FSetPixel : TSetPixelProc;
FConvertColor : TConvertColorProc;
FBGRAConvertColor : TBGRAConvertColorProc;
FHandleScanline: THandleScanlineProc;
FVerticalShrinkMask: BGRADWord;
FVerticalShrinkShr: integer;
function GetOriginalHeight: integer;
function GetOriginalWidth: integer;
function GetVerticalShrinkFactor: integer;
procedure ReadChunk;
procedure HandleData;
procedure HandleUnknown;
function ColorGray1 (const CD:TColorData) : TFPColor;
function ColorGray2 (const CD:TColorData) : TFPColor;
function ColorGray4 (const CD:TColorData) : TFPColor;
function ColorGray8 (const CD:TColorData) : TFPColor;
function ColorGray16 (const CD:TColorData) : TFPColor;
function ColorGrayAlpha8 (const CD:TColorData) : TFPColor;
function ColorGrayAlpha16 (const CD:TColorData) : TFPColor;
function ColorColor8 (const CD:TColorData) : TFPColor;
function ColorColor16 (const CD:TColorData) : TFPColor;
function ColorColorAlpha8 (const CD:TColorData) : TFPColor;
function ColorColorAlpha16 (const CD:TColorData) : TFPColor;
function BGRAColorGray1 (const CD:TColorData) : TBGRAPixel;
function BGRAColorGray2 (const CD:TColorData) : TBGRAPixel;
function BGRAColorGray4 (const CD:TColorData) : TBGRAPixel;
function BGRAColorGray8 (const CD:TColorData) : TBGRAPixel;
function BGRAColorGray16 (const CD:TColorData) : TBGRAPixel;
function BGRAColorGrayAlpha8 (const CD:TColorData) : TBGRAPixel;
function BGRAColorGrayAlpha16 (const CD:TColorData) : TBGRAPixel;
function BGRAColorColor8 (const CD:TColorData) : TBGRAPixel;
function BGRAColorColor16 (const CD:TColorData) : TBGRAPixel;
function BGRAColorColorAlpha8 (const CD:TColorData) : TBGRAPixel;
function BGRAColorColorAlpha16 (const CD:TColorData) : TBGRAPixel;
protected
Chunk : TChunk;
UseTransparent, EndOfFile : boolean;
TransparentDataValue : TColorData;
UsingBitGroup : byte;
DataIndex : BGRALongWord;
DataBytes : TColorData;
procedure HandleChunk; virtual;
procedure HandlePalette; virtual;
procedure HandleAlpha; virtual;
function CalcX (relX:integer) : integer;
function CalcY (relY:integer) : integer;
function CalcColor(const Scanline : PByteArray): TColorData;
procedure HandleScanline (const y : integer; const Scanline : PByteArray); virtual;
procedure BGRAHandleScanline(const y: integer; const Scanline: PByteArray);
procedure BGRAHandleScanlineTr(const y: integer; const Scanline: PByteArray);
procedure DoDecompress; virtual;
procedure SetPalettePixel (x,y:integer; const CD : TColordata);
procedure SetPalColPixel (x,y:integer; const CD : TColordata);
procedure SetColorPixel (x,y:integer; const CD : TColordata);
procedure SetColorTrPixel (x,y:integer; const CD : TColordata);
procedure SetBGRAColorPixel (x,y:integer; const CD : TColordata);
procedure SetBGRAColorTrPixel (x,y:integer; const CD : TColordata);
function DecideSetPixel : TSetPixelProc; virtual;
procedure InternalRead ({%H-}Str:TStream; Img:TFPCustomImage); override;
function InternalCheck (Str:TStream) : boolean; override;
//property ColorFormat : TColorformat read CFmt;
property ConvertColor : TConvertColorProc read FConvertColor;
property CurrentPass : byte read FCurrentPass;
property Pltte : boolean read FPltte;
property ThePalette : TFPPalette read FPalette;
property Header : THeaderChunk read FHeader;
property CountScanlines : EightLong read FCountScanlines;
property ScanlineLength : EightLong read FScanlineLength;
public
MinifyHeight: integer;
constructor create; override;
destructor destroy; override;
property VerticalShrinkFactor: integer read GetVerticalShrinkFactor;
property OriginalWidth: integer read GetOriginalWidth;
property OriginalHeight: integer read GetOriginalHeight;
function GetQuickInfo(AStream: TStream): TQuickImageInfo; override;
end;
implementation
uses math;
const StartPoints : array[0..7, 0..1] of BGRAWord =
((0,0),(0,0),(4,0),(0,4),(2,0),(0,2),(1,0),(0,1));
Delta : array[0..7,0..1] of BGRAWord =
((1,1),(8,8),(8,8),(4,8),(4,4),(2,4),(2,2),(1,2));
BitsUsed1Depth : EightLong = ($80,$40,$20,$10,$08,$04,$02,$01);
BitsUsed2Depth : EightLong = ($C0,$30,$0C,$03,0,0,0,0);
BitsUsed4Depth : EightLong = ($F0,$0F,0,0,0,0,0,0);
constructor TBGRAReaderPNG.create;
begin
inherited;
chunk.acapacity := 0;
chunk.data := nil;
UseTransparent := False;
end;
destructor TBGRAReaderPNG.destroy;
begin
with chunk do
if acapacity > 0 then
freemem (data);
inherited;
end;
function TBGRAReaderPNG.GetQuickInfo(AStream: TStream): TQuickImageInfo;
const headerChunkSize = 13;
var
{%H-}FileHeader : packed array[0..7] of byte;
{%H-}ChunkHeader : TChunkHeader;
{%H-}HeaderChunk : THeaderChunk;
begin
fillchar({%H-}result, sizeof(result), 0);
if AStream.Read({%H-}FileHeader, sizeof(FileHeader))<> sizeof(FileHeader) then exit;
{.$IFDEF OBJ} //#
if BGRAQWord(FileHeader) <> BGRAQWord(PNGComn.Signature) then exit;
{.$ENDIF}
if AStream.Read({%H-}ChunkHeader, sizeof(ChunkHeader))<> sizeof(ChunkHeader) then exit;
if ChunkHeader.CType <> ChunkTypes[ctIHDR] then exit;
if {$IFNDEF BDS}BEtoN{$ENDIF}(ChunkHeader.CLength) < headerChunkSize then exit;
if AStream.Read({%H-}HeaderChunk, headerChunkSize) <> headerChunkSize then exit;
result.width:= {$IFNDEF BDS}BEtoN{$ENDIF}(HeaderChunk.Width);
result.height:= {$IFNDEF BDS}BEtoN{$ENDIF}(HeaderChunk.height);
case HeaderChunk.ColorType and 3 of
0,3: {grayscale, palette}
if HeaderChunk.BitDepth > 8 then
result.colorDepth := 8
else
result.colorDepth := HeaderChunk.BitDepth;
2: {color} result.colorDepth := HeaderChunk.BitDepth*3;
end;
if (HeaderChunk.ColorType and 4) = 4 then
result.alphaDepth := HeaderChunk.BitDepth
else
result.alphaDepth := 0;
end;
procedure TBGRAReaderPNG.ReadChunk;
var {%H-}ChunkHeader : TChunkHeader;
readCRC : BGRALongWord;
l : BGRALongWord;
begin
TheStream.Read ({%H-}ChunkHeader,sizeof(ChunkHeader));
with chunk do
begin
// chunk header
with ChunkHeader do
begin
{$IFDEF ENDIAN_LITTLE}
alength := FPImgCmn.swap(CLength);
{$ELSE}
alength := CLength;
{$ENDIF}
ReadType := CType;
end;
aType := low(TChunkTypes);
while (aType < high(TChunkTypes)) and (ChunkTypes[aType] <> ReadType) do
inc (aType);
if alength > MaxChunkLength then
raise PNGImageException.Create ('Invalid chunklength');
if alength > acapacity then
begin
if acapacity > 0 then
freemem (data);
GetMem (data, alength);
acapacity := alength;
end;
l := TheStream.read (data^, alength);
if l <> alength then
raise PNGImageException.Create ('Chunk length exceeds stream length');
readCRC := 0;
TheStream.Read (readCRC, sizeof(ReadCRC));
l := CalculateCRC (All1Bits, ReadType, sizeOf(ReadType));
l := CalculateCRC (l, data^, alength);
{$IFDEF ENDIAN_LITTLE}
l := FPImgCmn.swap(l xor All1Bits);
{$ELSE}
l := l xor All1Bits;
{$ENDIF}
if ReadCRC <> l then
raise PNGImageException.Create ('CRC check failed');
end;
end;
function TBGRAReaderPNG.GetVerticalShrinkFactor: integer;
begin
result := 1 shl FVerticalShrinkShr;
end;
function TBGRAReaderPNG.GetOriginalHeight: integer;
begin
result := Header.height;
end;
function TBGRAReaderPNG.GetOriginalWidth: integer;
begin
result := header.Width;
end;
procedure TBGRAReaderPNG.HandleData;
var OldSize : BGRALongWord;
begin
OldSize := ZData.size;
ZData.Size := OldSize;
ZData.Size := ZData.Size + Chunk.aLength;
ZData.Write (chunk.Data^, chunk.aLength);
end;
procedure TBGRAReaderPNG.HandleAlpha;
procedure PaletteAlpha;
var r : integer;
a : BGRAWord;
c : TFPColor;
begin
with chunk do
begin
if alength > BGRALongWord(ThePalette.count) then
raise PNGImageException.create ('To much alpha values for palette');
for r := 0 to alength-1 do
begin
c := ThePalette[r];
a := data^[r];
c.alpha := (a shl 8) + a;
ThePalette[r] := c;
end;
end;
end;
procedure TransparentGray;
var {%H-}a : BGRAWord;
begin
move (chunk.data^[0], {%H-}a, 2);
{$IFDEF ENDIAN_LITTLE}
a := FPImgCmn.swap (a);
{$ENDIF}
TransparentDataValue := a;
UseTransparent := True;
end;
procedure TransparentColor;
var d : byte;
{%H-}r,{%H-}g,{%H-}b : BGRAWord;
a : TColorData;
begin
with chunk do
begin
move (data^[0], {%H-}r, 2);
move (data^[2], {%H-}g, 2);
move (data^[4], {%H-}b, 2);
end;
{$IFDEF ENDIAN_LITTLE}
r := FPImgCmn.swap (r);
g := FPImgCmn.swap (g);
b := FPImgCmn.swap (b);
{$ENDIF}
d := header.bitdepth;
a := (TColorData(b) shl d) shl d;
a := a + (TColorData(g) shl d) + r;
TransparentDataValue := a;
UseTransparent := True;
end;
begin
case header.ColorType of
3 : PaletteAlpha;
0 : TransparentGray;
2 : TransparentColor;
end;
end;
procedure TBGRAReaderPNG.HandlePalette;
var r : BGRALongWord;
c : TFPColor;
t : BGRAWord;
begin
if header.colortype = 3 then
with chunk do
begin
if TheImage.UsePalette then
FPalette := TheImage.Palette
else
FPalette := TFPPalette.Create(0);
c.Alpha := AlphaOpaque;
if (aLength mod 3) > 0 then
raise PNGImageException.Create ('Impossible length for PLTE-chunk');
r := 0;
ThePalette.count := 0;
while r < alength do
begin
t := data^[r];
c.red := t + (t shl 8);
inc (r);
t := data^[r];
c.green := t + (t shl 8);
inc (r);
t := data^[r];
c.blue := t + (t shl 8);
inc (r);
ThePalette.Add (c);
end;
end;
end;
procedure TBGRAReaderPNG.SetPalettePixel (x,y:integer; const CD : TColordata);
begin // both PNG and palette have palette
TheImage.Pixels[x,y] := CD;
end;
procedure TBGRAReaderPNG.SetPalColPixel (x,y:integer; const CD : TColordata);
begin // PNG with palette, Img without
TheImage.Colors[x,y] := ThePalette[CD];
end;
procedure TBGRAReaderPNG.SetColorPixel (x,y:integer; const CD : TColordata);
var c : TFPColor;
begin // both PNG and Img work without palette, and no transparency colordata
// c := ConvertColor (CD,CFmt);
c := ConvertColor (CD);
TheImage.Colors[x,y] := c;
end;
procedure TBGRAReaderPNG.SetColorTrPixel (x,y:integer; const CD : TColordata);
var c : TFPColor;
begin // both PNG and Img work without palette, and there is a transparency colordata
//c := ConvertColor (CD,CFmt);
c := ConvertColor (CD);
if TransparentDataValue = CD then
c.alpha := alphaTransparent;
TheImage.Colors[x,y] := c;
end;
procedure TBGRAReaderPNG.SetBGRAColorPixel(x, y: integer; const CD: TColordata);
var c: TBGRAPixel;
begin
c := FBGRAConvertColor(CD);
if c.alpha = 0 then TBGRACustomBitmap(TheImage).SetPixel(x,y,BGRAPixelTransparent)
else TBGRACustomBitmap(TheImage).SetPixel(x,y,c);
end;
procedure TBGRAReaderPNG.SetBGRAColorTrPixel(x, y: integer; const CD: TColordata);
var c: TBGRAPixel;
begin
if TransparentDataValue = CD then
TBGRACustomBitmap(TheImage).SetPixel(x,y,BGRAPixelTransparent) else
begin
c := FBGRAConvertColor(CD);
if c.alpha = 0 then TBGRACustomBitmap(TheImage).SetPixel(x,y,BGRAPixelTransparent)
else TBGRACustomBitmap(TheImage).SetPixel(x,y,c);
end;
end;
function TBGRAReaderPNG.DecideSetPixel : TSetPixelProc;
begin
if Pltte then
if TheImage.UsePalette then
result := {$IFDEF OBJ}@{$ENDIF}SetPalettePixel
else
result := {$IFDEF OBJ}@{$ENDIF}SetPalColPixel
else
if UseTransparent then
begin
if TheImage is TBGRACustomBitmap then
result := {$IFDEF OBJ}@{$ENDIF}SetBGRAColorTrPixel
else
result := {$IFDEF OBJ}@{$ENDIF}SetColorTrPixel
end
else
begin
if TheImage is TBGRACustomBitmap then
result := {$IFDEF OBJ}@{$ENDIF}SetBGRAColorPixel
else
result := {$IFDEF OBJ}@{$ENDIF}SetColorPixel
end;
end;
function TBGRAReaderPNG.CalcX (relX:integer) : integer;
begin
result := StartX + (relX * deltaX);
end;
function TBGRAReaderPNG.CalcY (relY:integer) : integer;
begin
result := StartY + (relY * deltaY);
end;
function TBGRAReaderPNG.CalcColor(const ScanLine : PByteArray): TColorData;
var cd : BGRALongWord;
r : BGRAWord;
p : pbyte;
begin
if UsingBitGroup = 0 then
begin
Databytes := 0;
if Header.BitDepth = 16 then
begin
p := @Databytes;
for r:=0 to bytewidth shr 1 - 1 do
begin
p^ := ScanLine^[Dataindex+(r shl 1)+1];
(p+1)^ := ScanLine^[Dataindex+(r shl 1)];
inc(p,2);
end;
end
else move (ScanLine^[DataIndex], Databytes, bytewidth);
{$IFDEF ENDIAN_BIG}
Databytes:=FPImgCmn.swap(Databytes);
{$ENDIF}
inc (DataIndex,bytewidth);
end;
if bytewidth = 1 then
begin
cd := (Databytes and BitsUsed[UsingBitGroup]);
result := cd shr ((CountBitsUsed-UsingBitGroup-1) * BitShift);
inc (UsingBitgroup);
if UsingBitGroup >= CountBitsUsed then
UsingBitGroup := 0;
end
else
result := Databytes;
end;
procedure TBGRAReaderPNG.HandleScanLine (const y : integer; const ScanLine : PByteArray);
var x, rx : integer;
c : TColorData;
begin
UsingBitGroup := 0;
DataIndex := 0;
X := StartX;
if (UsingBitGroup = 0) and (Header.BitDepth <> 16) then
case ByteWidth of
1: if BitsUsed[0] = $ff then
begin
for rx := 0 to ScanlineLength[CurrentPass]-1 do
begin
FSetPixel (x,y,ScanLine^[DataIndex]);
Inc(X, deltaX);
inc(DataIndex);
end;
exit;
end;
2: begin
for rx := 0 to ScanlineLength[CurrentPass]-1 do
begin
{$IFDEF ENDIAN_BIG}
FSetPixel (x,y,FPImgCmn.swap(PBGRAWord(@Scanline^[DataIndex])^));
{$ELSE}
FSetPixel (x,y,PBGRAWord(@Scanline^[DataIndex])^);
{$ENDIF}
Inc(X, deltaX);
inc(DataIndex,2);
end;
exit;
end;
4: begin
for rx := 0 to ScanlineLength[CurrentPass]-1 do
begin
{$IFDEF ENDIAN_BIG}
FSetPixel (x,y,FPImgCmn.swap(PBGRADWord(@Scanline^[DataIndex])^));
{$ELSE}
FSetPixel (x,y,PBGRADWord(@Scanline^[DataIndex])^);
{$ENDIF}
Inc(X, deltaX);
inc(DataIndex,4);
end;
exit;
end;
8: begin
for rx := 0 to ScanlineLength[CurrentPass]-1 do
begin
{$IFDEF ENDIAN_BIG}
FSetPixel (x,y,FPImgCmn.swap(PBGRAQWord(@Scanline^[DataIndex])^));
{$ELSE}
FSetPixel (x,y,PBGRAQWord(@Scanline^[DataIndex])^);
{$ENDIF}
Inc(X, deltaX);
inc(DataIndex,8);
end;
exit;
end;
end;
for rx := 0 to ScanlineLength[CurrentPass]-1 do
begin
c := CalcColor(ScanLine);
FSetPixel (x,y,c);
Inc(X, deltaX);
end
end;
procedure TBGRAReaderPNG.BGRAHandleScanLine (const y : integer; const ScanLine : PByteArray);
var x, rx : integer;
c : TColorData;
pdest: PBGRAPixel;
begin
UsingBitGroup := 0;
DataIndex := 0;
{$IFDEF FPC}{$PUSH}{$ENDIF}{$RANGECHECKS OFF} //because PByteArray is limited to 32767
if (UsingBitGroup = 0) and (Header.BitDepth <> 16) then
case ByteWidth of
1: if BitsUsed[0] = $ff then
begin
pdest := TBGRACustomBitmap(TheImage).ScanLine[y]+StartX;
for rx := 0 to ScanlineLength[CurrentPass]-1 do
begin
pdest^ := FBGRAConvertColor(ScanLine^[DataIndex]);
if pdest^.alpha = 0 then pdest^ := BGRAPixelTransparent;
Inc(pdest, deltaX);
inc(DataIndex);
end;
exit;
end;
2: begin
pdest := TBGRACustomBitmap(TheImage).ScanLine[y]+StartX;
for rx := 0 to ScanlineLength[CurrentPass]-1 do
begin
pdest^ := FBGRAConvertColor(
{$IFDEF ENDIAN_BIG}
FPImgCmn.swap(PBGRAWord(@Scanline^[DataIndex])^)
{$ELSE}
PBGRAWord(@Scanline^[DataIndex])^
{$ENDIF} );
if pdest^.alpha = 0 then pdest^ := BGRAPixelTransparent;
Inc(pdest, deltaX);
inc(DataIndex,2);
end;
exit;
end;
4: begin
pdest := TBGRACustomBitmap(TheImage).ScanLine[y]+StartX;
for rx := 0 to ScanlineLength[CurrentPass]-1 do
begin
pdest^ := FBGRAConvertColor(
{$IFDEF ENDIAN_BIG}
FPImgCmn.swap(PBGRADWord(@Scanline^[DataIndex])^)
{$ELSE}
PBGRADWord(@Scanline^[DataIndex])^
{$ENDIF} );
if pdest^.alpha = 0 then pdest^ := BGRAPixelTransparent;
Inc(pdest, deltaX);
inc(DataIndex,4);
end;
exit;
end;
8: begin
pdest := TBGRACustomBitmap(TheImage).ScanLine[y]+StartX;
for rx := 0 to ScanlineLength[CurrentPass]-1 do
begin
pdest^ := FBGRAConvertColor(
{$IFDEF ENDIAN_BIG}
FPImgCmn.swap(PBGRAQWord(@Scanline^[DataIndex])^)
{$ELSE}
PBGRAQWord(@Scanline^[DataIndex])^
{$ENDIF} );
if pdest^.alpha = 0 then pdest^ := BGRAPixelTransparent;
Inc(pdest, deltaX);
inc(DataIndex,8);
end;
exit;
end;
end;
{$IFDEF FPC}{$POP}{$ENDIF}
X := StartX;
for rx := 0 to ScanlineLength[CurrentPass]-1 do
begin
c := CalcColor(ScanLine);
FSetPixel (x,y,c);
Inc(X, deltaX);
end
end;
procedure TBGRAReaderPNG.BGRAHandleScanLineTr(const y: integer;
const ScanLine: PByteArray);
var x, rx : integer;
c : TColorData;
pdest: PBGRAPixel;
begin
UsingBitGroup := 0;
DataIndex := 0;
if (UsingBitGroup = 0) and (Header.BitDepth <> 16) then
case ByteWidth of
1: if BitsUsed[0] = $ff then
begin
pdest := TBGRACustomBitmap(TheImage).ScanLine[y]+StartX;
for rx := 0 to ScanlineLength[CurrentPass]-1 do
begin
c := ScanLine^[DataIndex];
if c = TransparentDataValue then
pdest^ := BGRAPixelTransparent else
begin
pdest^ := FBGRAConvertColor(c);
if pdest^.alpha = 0 then pdest^ := BGRAPixelTransparent;
end;
Inc(pdest, deltaX);
inc(DataIndex);
end;
exit;
end;
2: begin
pdest := TBGRACustomBitmap(TheImage).ScanLine[y]+StartX;
for rx := 0 to ScanlineLength[CurrentPass]-1 do
begin
c :=
{$IFDEF ENDIAN_BIG}
FPImgCmn.swap(PBGRAWord(@Scanline^[DataIndex])^)
{$ELSE}
PBGRAWord(@Scanline^[DataIndex])^
{$ENDIF} ;
if c = TransparentDataValue then
pdest^ := BGRAPixelTransparent else
begin
pdest^ := FBGRAConvertColor(c);
if pdest^.alpha = 0 then pdest^ := BGRAPixelTransparent;
end;
Inc(pdest, deltaX);
inc(DataIndex,2);
end;
exit;
end;
4: begin
pdest := TBGRACustomBitmap(TheImage).ScanLine[y]+StartX;
for rx := 0 to ScanlineLength[CurrentPass]-1 do
begin
c :=
{$IFDEF ENDIAN_BIG}
FPImgCmn.swap(PBGRADWord(@Scanline^[DataIndex])^)
{$ELSE}
PBGRADWord(@Scanline^[DataIndex])^
{$ENDIF} ;
if c = TransparentDataValue then
pdest^ := BGRAPixelTransparent else
begin
pdest^ := FBGRAConvertColor(c);
if pdest^.alpha = 0 then pdest^ := BGRAPixelTransparent;
end;
Inc(pdest, deltaX);
inc(DataIndex,4);
end;
exit;
end;
8: begin
pdest := TBGRACustomBitmap(TheImage).ScanLine[y]+StartX;
for rx := 0 to ScanlineLength[CurrentPass]-1 do
begin
c :=
{$IFDEF ENDIAN_BIG}
FPImgCmn.swap(PBGRAQWord(@Scanline^[DataIndex])^)
{$ELSE}
PBGRAQWord(@Scanline^[DataIndex])^
{$ENDIF} ;
if c = TransparentDataValue then
pdest^ := BGRAPixelTransparent else
begin
pdest^ := FBGRAConvertColor(c);
if pdest^.alpha = 0 then pdest^ := BGRAPixelTransparent;
end;
Inc(pdest, deltaX);
inc(DataIndex,8);
end;
exit;
end;
end;
X := StartX;
for rx := 0 to ScanlineLength[CurrentPass]-1 do
begin
c := CalcColor(ScanLine);
FSetPixel (x,y,c);
Inc(X, deltaX);
end
end;
function TBGRAReaderPNG.ColorGray1 (const CD:TColorDAta) : TFPColor;
begin
if CD = 0 then
result := colBlack
else
result := colWhite;
end;
function TBGRAReaderPNG.ColorGray2 (const CD:TColorDAta) : TFPColor;
var c : BGRANativeUInt;
begin
c := CD and 3;
c := c + (c shl 2);
c := c + (c shl 4);
c := c + (c shl 8);
with result do
begin
red := c;
green := c;
blue := c;
alpha := alphaOpaque;
end;
end;
function TBGRAReaderPNG.ColorGray4 (const CD:TColorDAta) : TFPColor;
var c : BGRANativeUInt;
begin
c := CD and $F;
c := c + (c shl 4);
c := c + (c shl 8);
with result do
begin
red := c;
green := c;
blue := c;
alpha := alphaOpaque;
end;
end;
function TBGRAReaderPNG.ColorGray8 (const CD:TColorDAta) : TFPColor;
var c : BGRANativeUInt;
begin
c := CD and $FF;
c := c + (c shl 8);
with result do
begin
red := c;
green := c;
blue := c;
alpha := alphaOpaque;
end;
end;
function TBGRAReaderPNG.ColorGray16 (const CD:TColorDAta) : TFPColor;
var c : BGRANativeUInt;
begin
c := CD and $FFFF;
with result do
begin
red := c;
green := c;
blue := c;
alpha := alphaOpaque;
end;
end;
function TBGRAReaderPNG.ColorGrayAlpha8 (const CD:TColorData) : TFPColor;
var c : BGRANativeUInt;
begin
c := CD and $00FF;
c := c + (c shl 8);
with result do
begin
red := c;
green := c;
blue := c;
c := CD and $FF00;
alpha := c + (c shr 8);
end;
end;
function TBGRAReaderPNG.ColorGrayAlpha16 (const CD:TColorData) : TFPColor;
var c : BGRANativeUInt;
begin
c := CD and $FFFF;
with result do
begin
red := c;
green := c;
blue := c;
alpha := (CD shr 16) and $FFFF;
end;
end;
function TBGRAReaderPNG.ColorColor8 (const CD:TColorData) : TFPColor;
var c : BGRANativeUInt;
begin
with result do
begin
c := CD and $FF;
red := c + (c shl 8);
c := (CD shr 8) and $FF;
green := c + (c shl 8);
c := (CD shr 16) and $FF;
blue := c + (c shl 8);
alpha := alphaOpaque;
end;
end;
function TBGRAReaderPNG.ColorColor16 (const CD:TColorData) : TFPColor;
begin
with result do
begin
red := CD and $FFFF;
green := (CD shr 16) and $FFFF;
blue := (CD shr 32) and $FFFF;
alpha := alphaOpaque;
end;
end;
function TBGRAReaderPNG.ColorColorAlpha8 (const CD:TColorData) : TFPColor;
var c : BGRANativeUInt;
begin
with result do
begin
c := CD and $FF;
red := c + (c shl 8);
c := (CD shr 8) and $FF;
green := c + (c shl 8);
c := (CD shr 16) and $FF;
blue := c + (c shl 8);
c := (CD shr 24) and $FF;
alpha := c + (c shl 8);
end;
end;
function TBGRAReaderPNG.ColorColorAlpha16 (const CD:TColorData) : TFPColor;
{$IFDEF BDS}var _Int64 : BGRAInt64;{$ENDIF}
begin
with result do
begin
red := CD and $FFFF;
green := (CD shr 16) and $FFFF;
blue := (CD shr 32) and $FFFF;
{$IFDEF BDS}
move(CD , _Int64, sizeof(TColorData));
alpha := (_Int64 shr 48) and $FFFF;
{$ELSE}//#
alpha := (CD shr 48) and $FFFF;
{$ENDIF}
end;
end;
function TBGRAReaderPNG.BGRAColorGray1(const CD: TColorData): TBGRAPixel;
begin
if CD = 0 then
result := BGRABlack
else
result := BGRAWhite;
end;
function TBGRAReaderPNG.BGRAColorGray2(const CD: TColorData): TBGRAPixel;
var c : BGRANativeUInt;
begin
c := CD and 3;
c := c + (c shl 2);
c := c + (c shl 4);
result := BGRA(c,c,c);
end;
function TBGRAReaderPNG.BGRAColorGray4(const CD: TColorData): TBGRAPixel;
var c : BGRANativeUInt;
begin
c := CD and $F;
c := c + (c shl 4);
result := BGRA(c,c,c);
end;
function TBGRAReaderPNG.BGRAColorGray8(const CD: TColorData): TBGRAPixel;
var c : BGRANativeUInt;
begin
c := CD and $FF;
result := BGRA(c,c,c);
end;
function TBGRAReaderPNG.BGRAColorGray16(const CD: TColorData): TBGRAPixel;
var c : BGRANativeUInt;
begin
c := (CD shr 8) and $FF;
result := BGRA(c,c,c);
end;
function TBGRAReaderPNG.BGRAColorGrayAlpha8(const CD: TColorData): TBGRAPixel;
var c : BGRANativeUInt;
begin
c := CD and $00FF;
result := BGRA(c,c,c,(CD shr 8) and $FF);
end;
function TBGRAReaderPNG.BGRAColorGrayAlpha16(const CD: TColorData): TBGRAPixel;
var c : BGRANativeUInt;
begin
c := (CD shr 8) and $FF;
result := BGRA(c,c,c,(CD shr 24) and $FF);
end;
function TBGRAReaderPNG.BGRAColorColor8(const CD: TColorData): TBGRAPixel;
begin
result := BGRA(CD and $ff, (CD shr 8) and $ff, (CD shr 16) and $ff);
end;
function TBGRAReaderPNG.BGRAColorColor16(const CD: TColorData): TBGRAPixel;
{$IFDEF BDS}var _Int64 : BGRAInt64;{$ENDIF}
begin
{$IFDEF BDS}
move(CD , _Int64, sizeof(TColorData));
result := BGRA(CD shr 8 and $FF,(CD shr 24) and $FF,(_Int64 shr 40) and $FF);
{$ELSE}//#
result := BGRA(CD shr 8 and $FF,(CD shr 24) and $FF,(CD shr 40) and $FF);
{$ENDIF}
end;
function TBGRAReaderPNG.BGRAColorColorAlpha8(const CD: TColorData): TBGRAPixel;
begin
result := BGRA(CD and $ff, (CD shr 8) and $ff, (CD shr 16) and $ff, CD shr 24);
end;
function TBGRAReaderPNG.BGRAColorColorAlpha16(const CD: TColorData): TBGRAPixel;
{$IFDEF BDS}var _Int64 : BGRAInt64;{$ENDIF}
begin
{$IFDEF BDS}
move(CD , _Int64, sizeof(TColorData));
result := BGRA(CD shr 8 and $FF,(CD shr 24) and $FF,(_Int64 shr 40) and $FF, _Int64 shr 56);
{$ELSE}//#
result := BGRA(CD shr 8 and $FF,(CD shr 24) and $FF,(CD shr 40) and $FF, CD shr 56);
{$ENDIF}
end;
procedure TBGRAReaderPNG.DoDecompress;
procedure initVars;
var r,d : integer;
begin
with Header do
begin
if interlace=0 then
begin
StartPass := 0;
EndPass := 0;
FCountScanlines[0] := Height;
FScanLineLength[0] := Width;
end
else
begin
StartPass := 1;
EndPass := 7;
for r := 1 to 7 do
begin
d := Height div delta[r,1];
if (height mod delta[r,1]) > startpoints[r,1] then
inc (d);
FCountScanlines[r] := d;
d := width div delta[r,0];
if (width mod delta[r,0]) > startpoints[r,0] then
inc (d);
FScanLineLength[r] := d;