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sdJpegLossless.pas
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sdJpegLossless.pas
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{ unit sdJpegLossless
Author: Nils Haeck M.Sc.
Copyright (c) 2007 SimDesign B.V.
More information: www.simdesign.nl or n.haeck@simdesign.nl
This software may ONLY be used or replicated in accordance with
the LICENSE found in this source distribution.
}
unit sdJpegLossless;
{$i simdesign.inc}
interface
uses
Classes, SysUtils, Graphics, NativeXml, sdJpegTypes, sdJpegMarkers, sdDebug;
type
TsdLosslessAction = (laNoAction, laRotateLeft, laRotateRight, laRotate180, laFlipHor, laFlipVer);
const
cLosslessActionMsg: array[TsdLosslessAction] of Utf8String =
('No Action', 'Rotate Left', 'Rotate Right', 'Rotate 180', 'Flip Hor', 'Flip Ver');
type
TsdLosslessOperation = class(TsdDebugPersistent)
private
//FOwner: TObject; // pointer to TsdJpegFormat
FUpdateMetadata: boolean;
FBuffer: array of smallint;
FHasContrastChange: boolean;
FContrast: double;
FOnBeforeLossless: TsdUpdateEvent;
FOnAfterLossless: TsdUpdateEvent;
protected
procedure DoBeforeLossless;
procedure DoAfterLossless;
function GetBlockCoder: TObject;
function GetIntensityMapCount: integer;
procedure InfoTranspose;
procedure MapFlipHorz;
procedure MapFlipVert;
procedure MapTranspose;
procedure MapAdjustDCCoef(AMap: TsdJpegBlockMap; const ABrightness: double);
procedure MapAdjustDCandACCoef(AMap: TsdJpegBlockMap; const ABrightness, AContrast: double);
procedure MapCropMcuBlocks(AMap: TsdJpegBlockMap; AMcuX, AMcuY, AMcuWidth, AMcuHeight: integer);
procedure CoefFlipHorz(var Coef: TsdCoefBlock);
procedure CoefFlipVert(var Coef: TsdCoefBlock);
procedure CoefTranspose(var Coef: TsdCoefBlock);
procedure RemoveDHTMarkers;
public
constructor Create(AOwner: TObject); virtual;
procedure Clear; virtual;
// Crop the image to the window given with ALeft/ATop/ARight/ABottom. If the
// left/top coordinates do not fall exactly on a block boundary (multiples of
// 8 or 16, depending on encoding), then they'll be lowered to fall on the
// closest boundary. The coordinates are also checked for image size and
// updated accordingly.
procedure Crop(var ALeft, ATop, ARight, ABottom: integer);
// Flip the image horizontally
procedure FlipHorizontal;
// Flip the image vertically
procedure FlipVertical;
// Rotate the image 90 degrees clockwise
procedure Rotate90;
// Rotate the image 180 degrees
procedure Rotate180;
// Rotate the image 270 degrees clockwise (aka 90 degrees counter-clockwise)
procedure Rotate270;
// Transpose the image: lowerleft corner becomes upperright corner
procedure Transpose;
// Touch doesn't actually change the image in any way, it just causes removal
// of the original huffman encoding tables, so new ones (generally more optimized)
// will be created when the image is saved.
procedure Touch;
// Adjust the brightness of the image. For YCbCr images only the Y component
// is adjusted. For RGB and CMYK images, the 3 color components are each
// adjusted. Brightness adjustment only involves the DC coefficient (addition);
// the AC coefficients are left alone.
procedure AdjustBrightness(ABrightness: double);
// Adjust the brightness and contrast of the image. The brightness adjustment
// only influences the DC coefficients. If AContrast <> 1.0, the AC coefficients
// are also adjusted (multiplied by AContrast).
procedure AdjustBrightnessContrast(ABrightness: double; AContrast: double);
// Set UpdateMetadata to true to force the software to update the metadata. This
// includes e.g. the Exif rotation flag, JFIF/EXIF width/height, and JFIF thumbnail
// (not implemented at this moment).
property UpdateMetadata: boolean read FUpdateMetadata write FUpdateMetadata;
// connect to this event to process code before a lossless operation
property OnBeforeLossless: TsdUpdateEvent read FOnBeforeLossless write FOnBeforeLossless;
// connect to this event to process code after a lossless operation
property OnAfterLossless: TsdUpdateEvent read FOnAfterLossless write FOnAfterLossless;
end;
implementation
uses
sdJpegImage, sdJpegCoder;
{ TsdLosslessOperation }
procedure TsdLosslessOperation.AdjustBrightness(ABrightness: double);
var
i, MapCount: integer;
Coder: TsdJpegBlockCoder;
Map: TsdJpegBlockMap;
begin
DoBeforeLossless;
RemoveDHTMarkers;
if FHasContrastChange then
begin
AdjustBrightnessContrast(ABrightness, FContrast);
exit;
end;
MapCount := GetIntensityMapCount;
Coder := TsdJpegBlockCoder(GetBlockCoder);
// Indicate that the samples are no longer valid (requires a new IDCT to get them)
Coder.HasSamples := False;
// Multiply the brightness adjustment by 8 (since the coefficient for DC is
// a factor 8 too high)
ABrightness := ABrightness * 8;
for i := 0 to MapCount - 1 do
begin
Map := Coder.Maps[i];
if Map.TotalBlockCount <= 0 then
continue;
MapAdjustDCCoef(Map, ABrightness);
end;
DoAfterLossless;
end;
procedure TsdLosslessOperation.AdjustBrightnessContrast(ABrightness, AContrast: double);
var
i, MapCount: integer;
Coder: TsdJpegBlockCoder;
Map: TsdJpegBlockMap;
begin
DoBeforeLossless;
RemoveDHTMarkers;
FHasContrastChange := True;
FContrast := AContrast;
MapCount := GetIntensityMapCount;
Coder := TsdJpegBlockCoder(GetBlockCoder);
// Indicate that the samples are no longer valid (requires a new IDCT to get them)
Coder.HasSamples := False;
// Multiply the brightness adjustment by 8 (since the coefficient for DC is
// a factor 8 too high)
ABrightness := ABrightness * 8;
for i := 0 to MapCount - 1 do
begin
Map := Coder.Maps[i];
if Map.TotalBlockCount <= 0 then
continue;
MapAdjustDCandACCoef(Map, ABrightness, AContrast);
end;
DoAfterLossless;
end;
procedure TsdLosslessOperation.Clear;
begin
FHasContrastChange := False;
end;
procedure TsdLosslessOperation.CoefFlipHorz(var Coef: TsdCoefBlock);
var
i, Idx: integer;
begin
// Invert all odd indices
for i := 0 to 31 do
begin
Idx := i * 2 + 1;
Coef[Idx] := -Coef[Idx];
end;
end;
procedure TsdLosslessOperation.CoefFlipVert(var Coef: TsdCoefBlock);
var
y, row, i: integer;
begin
// invert all odd rows
for y := 0 to 3 do
begin
Row := (y * 2 + 1) * 8;
for i := Row to Row + 7 do
Coef[i] := -Coef[i];
end;
end;
procedure TsdLosslessOperation.CoefTranspose(var Coef: TsdCoefBlock);
var
x, y, i, j: integer;
Temp: smallint;
begin
// transpose indices
for y := 0 to 6 do
for x := y + 1 to 7 do
begin
i := x + y * 8;
j := x * 8 + y;
Temp := Coef[i];
Coef[i] := Coef[j];
Coef[j] := Temp;
end;
end;
constructor TsdLosslessOperation.Create(AOwner: TObject);
begin
inherited Create;
FOwner := TsdDebugComponent(AOwner);
end;
procedure TsdLosslessOperation.Crop(var ALeft, ATop, ARight, ABottom: integer);
var
i: integer;
Coder: TsdJpegBlockCoder;
Info: TsdJpegInfo;
L, T, W, H: integer;
Map: TsdJpegBlockMap;
begin
DoBeforeLossless;
DoDebugOut(Self, wsInfo, '"lossless" crop');
RemoveDHTMarkers;
Coder := TsdJpegBlockCoder(GetBlockCoder);
// Indicate that the samples are no longer valid (requires a new IDCT to get them)
Coder.HasSamples := False;
Info := TsdJpegImage(FOwner).JpegInfo;
DoDebugOut(Self, wsInfo, Format('orig image WxH = [%d,%d]', [Info.FWidth, Info.FHeight]));
DoDebugOut(Self, wsInfo, Format('crop to LTRB = [%d,%d,%d,%d]', [ALeft, ATop, ARight, ABottom]));
if ALeft < 0 then
ALeft := 0;
if ATop < 0 then
ATop := 0;
if ARight > Info.FWidth then
ARight := Info.FWidth;
if ABottom > Info.FHeight then
ABottom := Info.FHeight;
L := (ALeft div Info.FMcuWidth);
T := (ATop div Info.FMcuHeight);
ALeft := L * Info.FMcuWidth;
ATop := T * Info.FMcuHeight;
// Determine number of mcu blocks to copy
W := (ARight - ALeft + Info.FMcuWidth - 1) div Info.FMcuWidth;
H := (ABottom - ATop + Info.FMcuHeight - 1) div Info.FMcuHeight;
if (W <= 0) or (H <= 0) then
exit;
// Update Info
DoDebugOut(Self, wsInfo, Format('MCU blocks WxH=[%d,%d]', [W, H]));
Info.FHorzMcuCount := W;
Info.FVertMcuCount := H;
Info.FWidth := ARight - ALeft;
Info.FHeight := ABottom - ATop;
DoDebugOut(Self, wsInfo, Format('updated image WxH = [%d,%d]', [Info.FWidth, Info.FHeight]));
// Crop each map
for i := 0 to Info.FFrameCount - 1 do
begin
Map := Coder.Maps[i];
if not assigned(Map) then continue;
MapCropMcuBlocks(Map, L, T, W, H);
end;
DoAfterLossless;
end;
procedure TsdLosslessOperation.DoBeforeLossless;
begin
if assigned(FOnBeforeLossless) then
FOnBeforeLossless(Self);
end;
procedure TsdLosslessOperation.DoAfterLossless;
begin
if assigned(FOnAfterLossless) then
FOnAfterLossless(Self);
end;
procedure TsdLosslessOperation.FlipHorizontal;
begin
DoBeforeLossless;
DoDebugOut(Self, wsInfo, 'flip horizontal');
RemoveDHTMarkers;
MapFlipHorz;
DoAfterLossless;
end;
procedure TsdLosslessOperation.FlipVertical;
begin
DoBeforeLossless;
DoDebugOut(Self, wsInfo, 'flip vertical');
RemoveDHTMarkers;
MapFlipVert;
DoAfterLossless;
end;
function TsdLosslessOperation.GetBlockCoder: TObject;
var
FCoder: TsdJpegCoder;
begin
Result := nil;
if not (FOwner is TsdJpegImage) then
exit;
FCoder := TsdJpegImage(FOwner).Coder;
if not (FCoder is TsdJpegBlockCoder) or not FCoder.HasCoefficients then
begin
DoDebugOut(Self, wsFail, sNoDCTCoefficentsAvailable);
exit;
end;
if FCoder.Scale <> jsFull then
begin
DoDebugOut(Self, wsFail, sOperationOnlyFor8x8);
exit;
end;
Result := TsdJpegBlockCoder(FCoder);
end;
function TsdLosslessOperation.GetIntensityMapCount: integer;
var
Space: TsdJpegColorSpace;
begin
Result := 1;
Space := TsdJpegImage(FOwner).DetectInternalColorSpace;
case Space of
jcRGB, jcRGBA, jcCMYK:
Result := 3;
end;
end;
procedure TsdLosslessOperation.InfoTranspose;
var
i: integer;
Info: TsdJpegInfo;
Temp: integer;
begin
// Transpose parameters contained in info
// we cannot create a global swap func since these are properties
Info := TsdJpegImage(FOwner).JpegInfo;
// Swap width/height
Temp := Info.FWidth;
Info.FWidth := Info.FHeight;
Info.FHeight := Temp;
// Swap horz/vert sampling
Temp := Info.FHorzSamplingMax;
Info.FHorzSamplingMax := Info.FVertSamplingMax;
Info.FVertSamplingMax := Temp;
// swap mcuwidth/height
Temp := Info.FMcuWidth;
Info.FMcuWidth := Info.FMcuHeight;
Info.FMcuHeight := Temp;
// Make sure to match the restart interval (if any) to new horz mcu count
if Info.FRestartInterval = Info.FHorzMcuCount then
Info.FRestartInterval := Info.FVertMcuCount;
// the "else" should not be used! Can also be 0!
{ else
Info.RestartInterval := Info.HorzMcuCount;}
// swap horz/vert mcu count
Temp := Info.FHorzMcuCount;
Info.FHorzMcuCount := Info.FVertMcuCount;
Info.FVertMcuCount := Temp;
// We must also transpose quantization tables, since some software writes
// non-axisymmetric quant tables
for i := 0 to Info.FQuantizationTables.Count - 1 do
Info.FQuantizationTables[i].Transpose;
end;
procedure TsdLosslessOperation.MapAdjustDCandACCoef(AMap: TsdJpegBlockMap;
const ABrightness, AContrast: double);
var
i, j, Quant: integer;
Table: TsdQuantizationTable;
PSrc, PDst: PsdCoefBlock;
begin
// Make a backup of the coefficients
if not AMap.HasCoefBackup then
AMap.MakeCoefBackup;
// Quantization table
Table := TsdJpegImage(FOwner).JpegInfo.FQuantizationTables[AMap.Frame.FQTable];
Quant := Table.FQuant[0];
// First value is DC value
PSrc := AMap.FirstCoefBackup;
PDst := AMap.FirstCoef;
for i := 0 to AMap.TotalBlockCount - 1 do
begin
// Adjust DC
PDst[0] := round((PSrc[0] * Quant * AContrast + ABrightness) / Quant);
// Adjust AC
for j := 1 to 63 do
begin
if PSrc[j] = 0 then continue;
PDst[j] := round(PSrc[j] * AContrast);
end;
inc(PSrc);
inc(PDst);
end;
end;
procedure TsdLosslessOperation.MapAdjustDCCoef(AMap: TsdJpegBlockMap; const ABrightness: double);
var
i, Quant: integer;
Table: TsdQuantizationTable;
PSrc, PDst: PsdCoefBlock;
begin
// Make a backup of the coefficients
if not AMap.HasCoefBackup then
AMap.MakeCoefBackup;
// Quantization table
Table := TsdJpegImage(FOwner).JpegInfo.FQuantizationTables[AMap.Frame.FQTable];
Quant := Table.FQuant[0];
// First value is DC value
PSrc := AMap.FirstCoefBackup;
PDst := AMap.FirstCoef;
for i := 0 to AMap.TotalBlockCount - 1 do
begin
PDst[0] := round((PSrc[0] * Quant + ABrightness) / Quant);
inc(PSrc);
inc(PDst);
end;
end;
procedure TsdLosslessOperation.MapCropMcuBlocks(AMap: TsdJpegBlockMap;
AMcuX, AMcuY, AMcuWidth, AMcuHeight: integer);
var
Frame: TsdFrameComponent;
X, Y, W, H, Row: integer;
PSrc, PDst, PFirst: PsdCoefBlock;
begin
Frame := AMap.Frame;
X := AMcuX * Frame.FHorzSampling;
Y := AMcuY * Frame.FVertSampling;
W := AMcuWidth * Frame.FHorzSampling;
H := AMcuHeight * Frame.FVertSampling;
PFirst := AMap.FirstCoef;
// Copy the rows
for Row := 0 to H - 1 do
begin
PDst := PFirst;
inc(PDst, Row * W);
PSrc := AMap.GetCoefPointer(X, Y + Row);
Move(PSrc^, PDst^, W * AMap.BlockStride * SizeOf(smallint));
end;
// Now set the new size
AMap.Resize(W, H);
end;
procedure TsdLosslessOperation.MapFlipHorz;
var
x, y, i: integer;
Coder: TsdJpegBlockCoder;
Info: TsdJpegInfo;
Map: TsdJpegBlockMap;
PCoef, PBuf, PNew: PsdCoefBlock;
begin
Coder := TsdJpegBlockCoder(GetBlockCoder);
if not assigned(Coder) then
exit;
Info := TsdJpegImage(FOwner).JpegInfo;
// Indicate that the samples are no longer valid (requires a new IDCT to get them)
Coder.HasSamples := False;
// Process each map
for i := 0 to Info.FFrameCount - 1 do
begin
Map := Coder.Maps[i];
if Map.TotalBlockCount <= 0 then
continue;
Map.ClearCoefBackup;
SetLength(FBuffer, Map.ScanStride);
PBuf := @FBuffer[0];
for y := 0 to Map.VertBlockCount - 1 do
begin
for x := 0 to Map.HorzBlockCount - 1 do
begin
PCoef := Map.GetCoefPointer(x, y);
CoefFlipHorz(PCoef^);
// copy to the buffer, inverted
PNew := PBuf;
inc(PNew, Map.HorzBlockCount - x - 1);
Move(PCoef^, PNew^, Map.BlockStride * SizeOf(smallint));
end;
// Now we copy the buffer back
Move(PBuf^, Map.GetCoefPointer(0, y)^, Map.ScanStride * SizeOf(smallint));
end;
end;
end;
procedure TsdLosslessOperation.MapFlipVert;
var
y, i, j: integer;
Coder: TsdJpegBlockCoder;
Info: TsdJpegInfo;
Map: TsdJpegBlockMap;
PCoef, PBuf, PNew: PsdCoefBlock;
begin
Coder := TsdJpegBlockCoder(GetBlockCoder);
if not assigned(Coder) then
exit;
Info := TsdJpegImage(FOwner).JpegInfo;
// Indicate that the samples are no longer valid (requires a new IDCT to get them)
Coder.HasSamples := False;
// Process each map
for i := 0 to Info.FFrameCount - 1 do
begin
Map := Coder.Maps[i];
if Map.TotalBlockCount <= 0 then continue;
Map.ClearCoefBackup;
SetLength(FBuffer, Map.ScanStride);
PBuf := @FBuffer[0];
// First flip all the blocks vertically
PCoef := Map.GetCoefPointer(0, 0);
for j := 0 to Map.TotalBlockCount - 1 do
begin
CoefFlipVert(PCoef^);
inc(PCoef);
end;
// exchange scanlines
for y := 0 to Map.VertBlockCount div 2 - 1 do
begin
PCoef := Map.GetCoefPointer(0, y);
PNew := Map.GetCoefPointer(0, Map.VertBlockCount - y - 1);
// Coef -> Buf
Move(PCoef^, PBuf^, Map.ScanStride * SizeOf(smallint));
// New -> Coef
Move(PNew^, PCoef^, Map.ScanStride * SizeOf(smallint));
// Buf -> New
Move(PBuf^, PNew^, Map.ScanStride * SizeOf(smallint));
end;
end;
end;
procedure TsdLosslessOperation.MapTranspose;
var
x, y, i, j, Temp: integer;
CoefCount: integer;
Coder: TsdJpegBlockCoder;
Info: TsdJpegInfo;
Map: TsdJpegBlockMap;
PCoef, PBuf, PNew: PsdCoefBlock;
Frame: TsdFrameComponent;
begin
Coder := TsdJpegBlockCoder(GetBlockCoder);
if not assigned(Coder) then
exit;
Info := TsdJpegImage(FOwner).JpegInfo;
// Indicate that the samples are no longer valid (requires a new IDCT to get them)
Coder.HasSamples := False;
// Process each map
for i := 0 to Info.FFrameCount - 1 do
begin
Map := Coder.Maps[i];
Map.ClearCoefBackup;
if Map.TotalBlockCount <= 0 then
continue;
CoefCount := Map.ScanStride * Map.VertBlockCount;
SetLength(FBuffer, CoefCount);
PBuf := @FBuffer[0];
// First transpose all the blocks
PCoef := Map.GetCoefPointer(0, 0);
for j := 0 to Map.TotalBlockCount - 1 do
begin
CoefTranspose(PCoef^);
inc(PCoef);
end;
// Copy map coefficients to buffer
Move(Map.FirstCoef^, PBuf^, CoefCount * SizeOf(smallint));
// Transpose map and its frame info
Map.Resize(Map.VertBlockCount, Map.HorzBlockCount);
Frame := Map.Frame;
Temp := Frame.FHorzSampling;
Frame.FHorzSampling := Frame.FVertSampling;
Frame.FVertSampling := Temp;
// copy blocks back in transposed way
PNew := PBuf;
for x := 0 to Map.HorzBlockCount - 1 do
for y := 0 to Map.VertBlockCount - 1 do
begin
Move(PNew^, Map.GetCoefPointer(x, y)^, 64 * SizeOf(smallint));
inc(PNew);
end;
end;
end;
procedure TsdLosslessOperation.RemoveDHTMarkers;
var
Info: TsdJpegInfo;
begin
// When encoding later, the current Huffman tables might not be complete, so
// we remove them so they are regenerated.
TsdJpegImage(FOwner).Markers.RemoveMarkers([mkDHT]);
Info := TsdJpegImage(FOwner).JpegInfo;
Info.FDCHuffmanTables.Clear;
Info.FACHuffmanTables.Clear;
end;
procedure TsdLosslessOperation.Rotate180;
begin
DoBeforeLossless;
DoDebugOut(Self, wsInfo, 'lossless rotate 180deg');
RemoveDHTMarkers;
MapFlipHorz;
MapFlipVert;
DoAfterLossless;
end;
procedure TsdLosslessOperation.Rotate270;
begin
DoBeforeLossless;
DoDebugOut(Self, wsInfo, 'lossless rotate 270deg');
RemoveDHTMarkers;
InfoTranspose;
MapTranspose;
MapFlipVert;
DoAfterLossless;
end;
procedure TsdLosslessOperation.Rotate90;
begin
DoBeforeLossless;
DoDebugOut(Self, wsInfo, 'lossless rotate 90deg');
RemoveDHTMarkers;
InfoTranspose;
MapTranspose;
MapFlipHorz;
DoAfterLossless;
end;
procedure TsdLosslessOperation.Touch;
begin
DoBeforeLossless;
DoDebugOut(Self, wsInfo, 'lossless touch');
RemoveDHTMarkers;
DoAfterLossless;
end;
procedure TsdLosslessOperation.Transpose;
begin
DoBeforeLossless;
DoDebugOut(Self, wsInfo, 'lossless transpose');
RemoveDHTMarkers;
// Transpose parameters contained in info
InfoTranspose;
// Transpose maps
MapTranspose;
DoAfterLossless;
end;
end.