2574 lines
80 KiB
Plaintext
2574 lines
80 KiB
Plaintext
{
|
|
$Id: ImagingNetworkGraphics.pas 171 2009-09-02 01:34:19Z 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 image format loaders/savers for Network Graphics image
|
|
file formats PNG, MNG, and JNG.}
|
|
unit ImagingNetworkGraphics;
|
|
|
|
interface
|
|
|
|
{$I ImagingOptions.inc}
|
|
|
|
{ If MN support is enabled we must make sure PNG and JNG are enabled too.}
|
|
{$IFNDEF DONT_LINK_MNG}
|
|
{$UNDEF DONT_LINK_PNG}
|
|
{$UNDEF DONT_LINK_JNG}
|
|
{$ENDIF}
|
|
|
|
uses
|
|
Types, SysUtils, Classes, ImagingTypes, Imaging, ImagingUtility, ImagingFormats, dzlib;
|
|
|
|
type
|
|
{ Basic class for Network Graphics file formats loaders/savers.}
|
|
TNetworkGraphicsFileFormat = class(TImageFileFormat)
|
|
protected
|
|
FSignature: TChar8;
|
|
FPreFilter: LongInt;
|
|
FCompressLevel: LongInt;
|
|
FLossyCompression: LongBool;
|
|
FLossyAlpha: LongBool;
|
|
FQuality: LongInt;
|
|
FProgressive: LongBool;
|
|
function GetSupportedFormats: TImageFormats; override;
|
|
procedure ConvertToSupported(var Image: TImageData;
|
|
const Info: TImageFormatInfo); override;
|
|
public
|
|
constructor Create; override;
|
|
function TestFormat(Handle: TImagingHandle): Boolean; override;
|
|
procedure CheckOptionsValidity; override;
|
|
published
|
|
{ Sets precompression filter used when saving images with lossless compression.
|
|
Allowed values are: 0 (none), 1 (sub), 2 (up), 3 (average), 4 (paeth),
|
|
5 (use 0 for indexed/gray images and 4 for RGB/ARGB images),
|
|
6 (adaptive filtering - use best filter for each scanline - very slow).
|
|
Note that filters 3 and 4 are much slower than filters 1 and 2.
|
|
Default value is 5.}
|
|
property PreFilter: LongInt read FPreFilter write FPreFilter;
|
|
{ Sets ZLib compression level used when saving images with lossless compression.
|
|
Allowed values are in range 0 (no compresstion) to 9 (best compression).
|
|
Default value is 5.}
|
|
property CompressLevel: LongInt read FCompressLevel write FCompressLevel;
|
|
{ Specifies whether MNG animation frames are saved with lossy or lossless
|
|
compression. Lossless frames are saved as PNG images and lossy frames are
|
|
saved as JNG images. Allowed values are 0 (False) and 1 (True).
|
|
Default value is 0.}
|
|
property LossyCompression: LongBool read FLossyCompression write FLossyCompression;
|
|
{ Defines whether alpha channel of lossy MNG frames or JNG images
|
|
is lossy compressed too. Allowed values are 0 (False) and 1 (True).
|
|
Default value is 0.}
|
|
property LossyAlpha: LongBool read FLossyAlpha write FLossyAlpha;
|
|
{ Specifies compression quality used when saving lossy MNG frames or JNG images.
|
|
For details look at ImagingJpegQuality option.}
|
|
property Quality: LongInt read FQuality write FQuality;
|
|
{ Specifies whether images are saved in progressive format when saving lossy
|
|
MNG frames or JNG images. For details look at ImagingJpegProgressive.}
|
|
property Progressive: LongBool read FProgressive write FProgressive;
|
|
end;
|
|
|
|
{ Class for loading Portable Network Graphics Images.
|
|
Loads all types of this image format (all images in png test suite)
|
|
and saves all types with bitcount >= 8 (non-interlaced only).
|
|
Compression level and filtering can be set by options interface.
|
|
|
|
Supported ancillary chunks (loading):
|
|
tRNS, bKGD
|
|
(for indexed images transparency contains alpha values for palette,
|
|
RGB/Gray images with transparency are converted to formats with alpha
|
|
and pixels with transparent color are replaced with background color
|
|
with alpha = 0).}
|
|
TPNGFileFormat = class(TNetworkGraphicsFileFormat)
|
|
private
|
|
FLoadAnimated: LongBool;
|
|
protected
|
|
function LoadData(Handle: TImagingHandle; var Images: TDynImageDataArray;
|
|
OnlyFirstLevel: Boolean): Boolean; override;
|
|
function SaveData(Handle: TImagingHandle; const Images: TDynImageDataArray;
|
|
Index: LongInt): Boolean; override;
|
|
public
|
|
constructor Create; override;
|
|
published
|
|
property LoadAnimated: LongBool read FLoadAnimated write FLoadAnimated;
|
|
end;
|
|
|
|
{$IFNDEF DONT_LINK_MNG}
|
|
{ Class for loading Multiple Network Graphics files.
|
|
This format has complex animation capabilities but Imaging only
|
|
extracts frames. Individual frames are stored as standard PNG or JNG
|
|
images. Loads all types of these frames stored in IHDR-IEND and
|
|
JHDR-IEND streams (Note that there are MNG chunks
|
|
like BASI which define images but does not contain image data itself,
|
|
those are ignored).
|
|
Imaging saves MNG files as MNG-VLC (very low complexity) so it is basicaly
|
|
an array of image frames without MNG animation chunks. Frames can be saved
|
|
as lossless PNG or lossy JNG images (look at TPNGFileFormat and
|
|
TJNGFileFormat for info). Every frame can be in different data format.
|
|
|
|
Many frame compression settings can be modified by options interface.}
|
|
TMNGFileFormat = class(TNetworkGraphicsFileFormat)
|
|
protected
|
|
function LoadData(Handle: TImagingHandle; var Images: TDynImageDataArray;
|
|
OnlyFirstLevel: Boolean): Boolean; override;
|
|
function SaveData(Handle: TImagingHandle; const Images: TDynImageDataArray;
|
|
Index: LongInt): Boolean; override;
|
|
public
|
|
constructor Create; override;
|
|
end;
|
|
{$ENDIF}
|
|
|
|
{$IFNDEF DONT_LINK_JNG}
|
|
{ Class for loading JPEG Network Graphics Images.
|
|
Loads all types of this image format (all images in jng test suite)
|
|
and saves all types except 12 bit JPEGs.
|
|
Alpha channel in JNG images is stored separately from color/gray data and
|
|
can be lossy (as JPEG image) or lossless (as PNG image) compressed.
|
|
Type of alpha compression, compression level and quality,
|
|
and filtering can be set by options interface.
|
|
|
|
Supported ancillary chunks (loading):
|
|
tRNS, bKGD
|
|
(Images with transparency are converted to formats with alpha
|
|
and pixels with transparent color are replaced with background color
|
|
with alpha = 0).}
|
|
TJNGFileFormat = class(TNetworkGraphicsFileFormat)
|
|
protected
|
|
function LoadData(Handle: TImagingHandle; var Images: TDynImageDataArray;
|
|
OnlyFirstLevel: Boolean): Boolean; override;
|
|
function SaveData(Handle: TImagingHandle; const Images: TDynImageDataArray;
|
|
Index: LongInt): Boolean; override;
|
|
public
|
|
constructor Create; override;
|
|
end;
|
|
{$ENDIF}
|
|
|
|
|
|
implementation
|
|
|
|
uses
|
|
{$IFNDEF DONT_LINK_JNG}
|
|
ImagingJpeg, ImagingIO,
|
|
{$ENDIF}
|
|
ImagingCanvases;
|
|
|
|
const
|
|
NGDefaultPreFilter = 5;
|
|
NGDefaultCompressLevel = 5;
|
|
NGDefaultLossyAlpha = False;
|
|
NGDefaultLossyCompression = False;
|
|
NGDefaultProgressive = False;
|
|
NGDefaultQuality = 90;
|
|
NGLosslessFormats: TImageFormats = [ifIndex8, ifGray8, ifA8Gray8, ifGray16,
|
|
ifA16Gray16, ifR8G8B8, ifA8R8G8B8, ifR16G16B16, ifA16R16G16B16, ifB16G16R16,
|
|
ifA16B16G16R16];
|
|
NGLossyFormats: TImageFormats = [ifGray8, ifA8Gray8, ifR8G8B8, ifA8R8G8B8];
|
|
PNGDefaultLoadAnimated = True;
|
|
|
|
SPNGFormatName = 'Portable Network Graphics';
|
|
SPNGMasks = '*.png';
|
|
SMNGFormatName = 'Multiple Network Graphics';
|
|
SMNGMasks = '*.mng';
|
|
SJNGFormatName = 'JPEG Network Graphics';
|
|
SJNGMasks = '*.jng';
|
|
|
|
resourcestring
|
|
SErrorLoadingChunk = 'Error when reading %s chunk data. File may be corrupted.';
|
|
|
|
type
|
|
{ Chunk header.}
|
|
TChunkHeader = packed record
|
|
DataSize: LongWord;
|
|
ChunkID: TChar4;
|
|
end;
|
|
|
|
{ IHDR chunk format - PNG header.}
|
|
TIHDR = packed record
|
|
Width: LongWord; // Image width
|
|
Height: LongWord; // Image height
|
|
BitDepth: Byte; // Bits per pixel or bits per sample (for truecolor)
|
|
ColorType: Byte; // 0 = grayscale, 2 = truecolor, 3 = palette,
|
|
// 4 = gray + alpha, 6 = truecolor + alpha
|
|
Compression: Byte; // Compression type: 0 = ZLib
|
|
Filter: Byte; // Used precompress filter
|
|
Interlacing: Byte; // Used interlacing: 0 = no int, 1 = Adam7
|
|
end;
|
|
PIHDR = ^TIHDR;
|
|
|
|
{ MHDR chunk format - MNG header.}
|
|
TMHDR = packed record
|
|
FrameWidth: LongWord; // Frame width
|
|
FrameHeight: LongWord; // Frame height
|
|
TicksPerSecond: LongWord; // FPS of animation
|
|
NominalLayerCount: LongWord; // Number of layers in file
|
|
NominalFrameCount: LongWord; // Number of frames in file
|
|
NominalPlayTime: LongWord; // Play time of animation in ticks
|
|
SimplicityProfile: LongWord; // Defines which MNG features are used in this file
|
|
end;
|
|
PMHDR = ^TMHDR;
|
|
|
|
{ JHDR chunk format - JNG header.}
|
|
TJHDR = packed record
|
|
Width: LongWord; // Image width
|
|
Height: LongWord; // Image height
|
|
ColorType: Byte; // 8 = grayscale (Y), 10 = color (YCbCr),
|
|
// 12 = gray + alpha (Y-alpha), 14 = color + alpha (YCbCr-alpha)
|
|
SampleDepth: Byte; // 8, 12 or 20 (8 and 12 samples together) bit
|
|
Compression: Byte; // Compression type: 8 = Huffman coding
|
|
Interlacing: Byte; // 0 = single scan, 8 = progressive
|
|
AlphaSampleDepth: Byte; // 0, 1, 2, 4, 8, 16 if alpha compression is 0 (PNG)
|
|
// 8 if alpha compression is 8 (JNG)
|
|
AlphaCompression: Byte; // 0 = PNG graysscale IDAT, 8 = grayscale 8-bit JPEG
|
|
AlphaFilter: Byte; // 0 = PNG filter or no filter (JPEG)
|
|
AlphaInterlacing: Byte; // 0 = non interlaced
|
|
end;
|
|
PJHDR = ^TJHDR;
|
|
|
|
{ acTL chunk format - APNG animation control.}
|
|
TacTL = packed record
|
|
NumFrames: LongWord; // Number of frames
|
|
NumPlay: LongWord; // Number of times to loop the animation (0 = inf)
|
|
end;
|
|
PacTL =^TacTL;
|
|
|
|
{ fcTL chunk format - APNG frame control.}
|
|
TfcTL = packed record
|
|
SeqNumber: LongWord; // Sequence number of the animation chunk, starting from 0
|
|
Width: LongWord; // Width of the following frame
|
|
Height: LongWord; // Height of the following frame
|
|
XOffset: LongWord; // X position at which to render the following frame
|
|
YOffset: LongWord; // Y position at which to render the following frame
|
|
DelayNumer: Word; // Frame delay fraction numerator
|
|
DelayDenom: Word; // Frame delay fraction denominator
|
|
DisposeOp: Byte; // Type of frame area disposal to be done after rendering this frame
|
|
BlendOp: Byte; // Type of frame area rendering for this frame
|
|
end;
|
|
PfcTL = ^TfcTL;
|
|
|
|
const
|
|
{ PNG file identifier.}
|
|
PNGSignature: TChar8 = #$89'PNG'#$0D#$0A#$1A#$0A;
|
|
{ MNG file identifier.}
|
|
MNGSignature: TChar8 = #$8A'MNG'#$0D#$0A#$1A#$0A;
|
|
{ JNG file identifier.}
|
|
JNGSignature: TChar8 = #$8B'JNG'#$0D#$0A#$1A#$0A;
|
|
|
|
{ Constants for chunk identifiers and signature identifiers.
|
|
They are in big-endian format.}
|
|
IHDRChunk: TChar4 = 'IHDR';
|
|
IENDChunk: TChar4 = 'IEND';
|
|
MHDRChunk: TChar4 = 'MHDR';
|
|
MENDChunk: TChar4 = 'MEND';
|
|
JHDRChunk: TChar4 = 'JHDR';
|
|
IDATChunk: TChar4 = 'IDAT';
|
|
JDATChunk: TChar4 = 'JDAT';
|
|
JDAAChunk: TChar4 = 'JDAA';
|
|
JSEPChunk: TChar4 = 'JSEP';
|
|
PLTEChunk: TChar4 = 'PLTE';
|
|
BACKChunk: TChar4 = 'BACK';
|
|
DEFIChunk: TChar4 = 'DEFI';
|
|
TERMChunk: TChar4 = 'TERM';
|
|
tRNSChunk: TChar4 = 'tRNS';
|
|
bKGDChunk: TChar4 = 'bKGD';
|
|
gAMAChunk: TChar4 = 'gAMA';
|
|
acTLChunk: TChar4 = 'acTL';
|
|
fcTLChunk: TChar4 = 'fcTL';
|
|
fdATChunk: TChar4 = 'fdAT';
|
|
|
|
{ APNG frame dispose operations.}
|
|
DisposeOpNone = 0;
|
|
DisposeOpBackground = 1;
|
|
DisposeOpPrevious = 2;
|
|
|
|
{ APNG frame blending modes}
|
|
BlendOpSource = 0;
|
|
BlendOpOver = 1;
|
|
|
|
{ Interlace start and offsets.}
|
|
RowStart: array[0..6] of LongInt = (0, 0, 4, 0, 2, 0, 1);
|
|
ColumnStart: array[0..6] of LongInt = (0, 4, 0, 2, 0, 1, 0);
|
|
RowIncrement: array[0..6] of LongInt = (8, 8, 8, 4, 4, 2, 2);
|
|
ColumnIncrement: array[0..6] of LongInt = (8, 8, 4, 4, 2, 2, 1);
|
|
|
|
type
|
|
{ Helper class that holds information about MNG frame in PNG or JNG format.}
|
|
TFrameInfo = class(TObject)
|
|
public
|
|
FrameWidth, FrameHeight: LongInt;
|
|
IsJpegFrame: Boolean;
|
|
IHDR: TIHDR;
|
|
JHDR: TJHDR;
|
|
fcTL: TfcTL;
|
|
Palette: PPalette24;
|
|
PaletteEntries: LongInt;
|
|
Transparency: Pointer;
|
|
TransparencySize: LongInt;
|
|
Background: Pointer;
|
|
BackgroundSize: LongInt;
|
|
IDATMemory: TMemoryStream;
|
|
JDATMemory: TMemoryStream;
|
|
JDAAMemory: TMemoryStream;
|
|
constructor Create;
|
|
destructor Destroy; override;
|
|
procedure AssignSharedProps(Source: TFrameInfo);
|
|
end;
|
|
|
|
{ Defines type of Network Graphics file.}
|
|
TNGFileType = (ngPNG, ngAPNG, ngMNG, ngJNG);
|
|
|
|
TNGFileHandler = class(TObject)
|
|
public
|
|
FileType: TNGFileType;
|
|
Frames: array of TFrameInfo;
|
|
MHDR: TMHDR; // Main header for MNG files
|
|
acTL: TacTL; // Global anim control for APNG files
|
|
GlobalPalette: PPalette24;
|
|
GlobalPaletteEntries: LongInt;
|
|
GlobalTransparency: Pointer;
|
|
GlobalTransparencySize: LongInt;
|
|
destructor Destroy; override;
|
|
procedure Clear;
|
|
function GetLastFrame: TFrameInfo;
|
|
function AddFrameInfo: TFrameInfo;
|
|
end;
|
|
|
|
{ Network Graphics file parser and frame converter.}
|
|
TNGFileLoader = class(TNGFileHandler)
|
|
public
|
|
function LoadFile(Handle: TImagingHandle): Boolean;
|
|
procedure LoadImageFromPNGFrame(FrameWidth, FrameHeight: LongInt; const IHDR: TIHDR; IDATStream: TMemoryStream; var Image: TImageData);
|
|
{$IFNDEF DONT_LINK_JNG}
|
|
procedure LoadImageFromJNGFrame(FrameWidth, FrameHeight: LongInt; const JHDR: TJHDR; IDATStream, JDATStream, JDAAStream: TMemoryStream; var Image: TImageData);
|
|
{$ENDIF}
|
|
procedure ApplyFrameSettings(Frame: TFrameInfo; var Image: TImageData);
|
|
end;
|
|
|
|
TNGFileSaver = class(TNGFileHandler)
|
|
public
|
|
PreFilter: LongInt;
|
|
CompressLevel: LongInt;
|
|
LossyAlpha: Boolean;
|
|
Quality: LongInt;
|
|
Progressive: Boolean;
|
|
function SaveFile(Handle: TImagingHandle): Boolean;
|
|
procedure AddFrame(const Image: TImageData; IsJpegFrame: Boolean);
|
|
procedure StoreImageToPNGFrame(const IHDR: TIHDR; Bits: Pointer; FmtInfo: TImageFormatInfo; IDATStream: TMemoryStream);
|
|
{$IFNDEF DONT_LINK_JNG}
|
|
procedure StoreImageToJNGFrame(const JHDR: TJHDR; const Image: TImageData; IDATStream, JDATStream, JDAAStream: TMemoryStream);
|
|
{$ENDIF}
|
|
procedure SetFileOptions(FileFormat: TNetworkGraphicsFileFormat);
|
|
end;
|
|
|
|
{$IFNDEF DONT_LINK_JNG}
|
|
TCustomIOJpegFileFormat = class(TJpegFileFormat)
|
|
protected
|
|
FCustomIO: TIOFunctions;
|
|
procedure SetJpegIO(const JpegIO: TIOFunctions); override;
|
|
procedure SetCustomIO(const CustomIO: TIOFunctions);
|
|
end;
|
|
{$ENDIF}
|
|
|
|
TAPNGAnimator = class
|
|
public
|
|
class procedure Animate(var Images: TDynImageDataArray; const acTL: TacTL; const SrcFrames: array of TFrameInfo);
|
|
end;
|
|
|
|
{ Helper routines }
|
|
|
|
function PaethPredictor(A, B, C: LongInt): LongInt; {$IFDEF USE_INLINE}inline;{$ENDIF}
|
|
var
|
|
P, PA, PB, PC: LongInt;
|
|
begin
|
|
P := A + B - C;
|
|
PA := Abs(P - A);
|
|
PB := Abs(P - B);
|
|
PC := Abs(P - C);
|
|
if (PA <= PB) and (PA <= PC) then
|
|
Result := A
|
|
else
|
|
if PB <= PC then
|
|
Result := B
|
|
else
|
|
Result := C;
|
|
end;
|
|
|
|
procedure SwapRGB(Line: PByte; Width, SampleDepth, BytesPerPixel: LongInt);
|
|
var
|
|
I: LongInt;
|
|
Tmp: Word;
|
|
begin
|
|
case SampleDepth of
|
|
8:
|
|
for I := 0 to Width - 1 do
|
|
with PColor24Rec(Line)^ do
|
|
begin
|
|
Tmp := R;
|
|
R := B;
|
|
B := Tmp;
|
|
Inc(Line, BytesPerPixel);
|
|
end;
|
|
16:
|
|
for I := 0 to Width - 1 do
|
|
with PColor48Rec(Line)^ do
|
|
begin
|
|
Tmp := R;
|
|
R := B;
|
|
B := Tmp;
|
|
Inc(Line, BytesPerPixel);
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
const
|
|
{ Helper constants for 1/2/4 bit to 8 bit conversions.}
|
|
Mask1: array[0..7] of Byte = ($80, $40, $20, $10, $08, $04, $02, $01);
|
|
Shift1: array[0..7] of Byte = (7, 6, 5, 4, 3, 2, 1, 0);
|
|
Mask2: array[0..3] of Byte = ($C0, $30, $0C, $03);
|
|
Shift2: array[0..3] of Byte = (6, 4, 2, 0);
|
|
Mask4: array[0..1] of Byte = ($F0, $0F);
|
|
Shift4: array[0..1] of Byte = (4, 0);
|
|
|
|
function Get1BitPixel(Line: PByteArray; X: LongInt): Byte;
|
|
begin
|
|
Result := (Line[X shr 3] and Mask1[X and 7]) shr
|
|
Shift1[X and 7];
|
|
end;
|
|
|
|
function Get2BitPixel(Line: PByteArray; X: LongInt): Byte;
|
|
begin
|
|
Result := (Line[X shr 2] and Mask2[X and 3]) shr
|
|
Shift2[X and 3];
|
|
end;
|
|
|
|
function Get4BitPixel(Line: PByteArray; X: LongInt): Byte;
|
|
begin
|
|
Result := (Line[X shr 1] and Mask4[X and 1]) shr
|
|
Shift4[X and 1];
|
|
end;
|
|
|
|
{$IFNDEF DONT_LINK_JNG}
|
|
|
|
{ TCustomIOJpegFileFormat class implementation }
|
|
|
|
procedure TCustomIOJpegFileFormat.SetCustomIO(const CustomIO: TIOFunctions);
|
|
begin
|
|
FCustomIO := CustomIO;
|
|
end;
|
|
|
|
procedure TCustomIOJpegFileFormat.SetJpegIO(const JpegIO: TIOFunctions);
|
|
begin
|
|
inherited SetJpegIO(FCustomIO);
|
|
end;
|
|
|
|
{$ENDIF}
|
|
|
|
{ TFrameInfo class implementation }
|
|
|
|
constructor TFrameInfo.Create;
|
|
begin
|
|
IDATMemory := TMemoryStream.Create;
|
|
JDATMemory := TMemoryStream.Create;
|
|
JDAAMemory := TMemoryStream.Create;
|
|
end;
|
|
|
|
destructor TFrameInfo.Destroy;
|
|
begin
|
|
FreeMem(Palette);
|
|
FreeMem(Transparency);
|
|
FreeMem(Background);
|
|
IDATMemory.Free;
|
|
JDATMemory.Free;
|
|
JDAAMemory.Free;
|
|
inherited Destroy;
|
|
end;
|
|
|
|
procedure TFrameInfo.AssignSharedProps(Source: TFrameInfo);
|
|
begin
|
|
IHDR := Source.IHDR;
|
|
JHDR := Source.JHDR;
|
|
PaletteEntries := Source.PaletteEntries;
|
|
GetMem(Palette, PaletteEntries * SizeOf(TColor24Rec));
|
|
Move(Source.Palette^, Palette^, PaletteEntries * SizeOf(TColor24Rec));
|
|
TransparencySize := Source.TransparencySize;
|
|
GetMem(Transparency, TransparencySize);
|
|
Move(Source.Transparency^, Transparency^, TransparencySize);
|
|
end;
|
|
|
|
{ TNGFileHandler class implementation}
|
|
|
|
destructor TNGFileHandler.Destroy;
|
|
begin
|
|
Clear;
|
|
inherited Destroy;
|
|
end;
|
|
|
|
procedure TNGFileHandler.Clear;
|
|
var
|
|
I: LongInt;
|
|
begin
|
|
for I := 0 to Length(Frames) - 1 do
|
|
Frames[I].Free;
|
|
SetLength(Frames, 0);
|
|
FreeMemNil(GlobalPalette);
|
|
GlobalPaletteEntries := 0;
|
|
FreeMemNil(GlobalTransparency);
|
|
GlobalTransparencySize := 0;
|
|
end;
|
|
|
|
function TNGFileHandler.GetLastFrame: TFrameInfo;
|
|
var
|
|
Len: LongInt;
|
|
begin
|
|
Len := Length(Frames);
|
|
if Len > 0 then
|
|
Result := Frames[Len - 1]
|
|
else
|
|
Result := nil;
|
|
end;
|
|
|
|
function TNGFileHandler.AddFrameInfo: TFrameInfo;
|
|
var
|
|
Len: LongInt;
|
|
begin
|
|
Len := Length(Frames);
|
|
SetLength(Frames, Len + 1);
|
|
Result := TFrameInfo.Create;
|
|
Frames[Len] := Result;
|
|
end;
|
|
|
|
{ TNGFileLoader class implementation}
|
|
|
|
function TNGFileLoader.LoadFile(Handle: TImagingHandle): Boolean;
|
|
var
|
|
Sig: TChar8;
|
|
Chunk: TChunkHeader;
|
|
ChunkData: Pointer;
|
|
ChunkCrc: LongWord;
|
|
|
|
procedure ReadChunk;
|
|
begin
|
|
GetIO.Read(Handle, @Chunk, SizeOf(Chunk));
|
|
Chunk.DataSize := SwapEndianLongWord(Chunk.DataSize);
|
|
end;
|
|
|
|
procedure ReadChunkData;
|
|
var
|
|
ReadBytes: LongWord;
|
|
begin
|
|
FreeMemNil(ChunkData);
|
|
GetMem(ChunkData, Chunk.DataSize);
|
|
ReadBytes := GetIO.Read(Handle, ChunkData, Chunk.DataSize);
|
|
GetIO.Read(Handle, @ChunkCrc, SizeOf(ChunkCrc));
|
|
if ReadBytes <> Chunk.DataSize then
|
|
RaiseImaging(SErrorLoadingChunk, [string(Chunk.ChunkID)]);
|
|
end;
|
|
|
|
procedure SkipChunkData;
|
|
begin
|
|
GetIO.Seek(Handle, Chunk.DataSize + SizeOf(ChunkCrc), smFromCurrent);
|
|
end;
|
|
|
|
procedure StartNewPNGImage;
|
|
var
|
|
Frame: TFrameInfo;
|
|
begin
|
|
ReadChunkData;
|
|
|
|
if Chunk.ChunkID = fcTLChunk then
|
|
begin
|
|
if (Length(Frames) = 1) and (Frames[0].IDATMemory.Size = 0) then
|
|
begin
|
|
// First fcTL chunk maybe for first IDAT frame which is alredy created
|
|
Frame := Frames[0];
|
|
end
|
|
else
|
|
begin
|
|
// Subsequent APNG frames with data in fdAT
|
|
Frame := AddFrameInfo;
|
|
// Copy some shared props from first frame (IHDR is the same for all APNG frames, palette etc)
|
|
Frame.AssignSharedProps(Frames[0]);
|
|
end;
|
|
Frame.fcTL := PfcTL(ChunkData)^;
|
|
SwapEndianLongWord(@Frame.fcTL, 5);
|
|
Frame.fcTL.DelayNumer := SwapEndianWord(Frame.fcTL.DelayNumer);
|
|
Frame.fcTL.DelayDenom := SwapEndianWord(Frame.fcTL.DelayDenom);
|
|
Frame.FrameWidth := Frame.fcTL.Width;
|
|
Frame.FrameHeight := Frame.fcTL.Height;
|
|
end
|
|
else
|
|
begin
|
|
// This is frame defined by IHDR chunk
|
|
Frame := AddFrameInfo;
|
|
Frame.IHDR := PIHDR(ChunkData)^;
|
|
SwapEndianLongWord(@Frame.IHDR, 2);
|
|
Frame.FrameWidth := Frame.IHDR.Width;
|
|
Frame.FrameHeight := Frame.IHDR.Height;
|
|
end;
|
|
Frame.IsJpegFrame := False;
|
|
end;
|
|
|
|
procedure StartNewJNGImage;
|
|
var
|
|
Frame: TFrameInfo;
|
|
begin
|
|
ReadChunkData;
|
|
Frame := AddFrameInfo;
|
|
Frame.IsJpegFrame := True;
|
|
Frame.JHDR := PJHDR(ChunkData)^;
|
|
SwapEndianLongWord(@Frame.JHDR, 2);
|
|
Frame.FrameWidth := Frame.JHDR.Width;
|
|
Frame.FrameHeight := Frame.JHDR.Height;
|
|
end;
|
|
|
|
procedure AppendIDAT;
|
|
begin
|
|
ReadChunkData;
|
|
// Append current IDAT/fdAT chunk to storage stream
|
|
if Chunk.ChunkID = IDATChunk then
|
|
GetLastFrame.IDATMemory.Write(ChunkData^, Chunk.DataSize)
|
|
else if Chunk.ChunkID = fdATChunk then
|
|
GetLastFrame.IDATMemory.Write(PByteArray(ChunkData)[4], Chunk.DataSize - SizeOf(LongWord));
|
|
end;
|
|
|
|
procedure AppendJDAT;
|
|
begin
|
|
ReadChunkData;
|
|
// Append current JDAT chunk to storage stream
|
|
GetLastFrame.JDATMemory.Write(ChunkData^, Chunk.DataSize);
|
|
end;
|
|
|
|
procedure AppendJDAA;
|
|
begin
|
|
ReadChunkData;
|
|
// Append current JDAA chunk to storage stream
|
|
GetLastFrame.JDAAMemory.Write(ChunkData^, Chunk.DataSize);
|
|
end;
|
|
|
|
procedure LoadPLTE;
|
|
begin
|
|
ReadChunkData;
|
|
if GetLastFrame = nil then
|
|
begin
|
|
// Load global palette
|
|
GetMem(GlobalPalette, Chunk.DataSize);
|
|
Move(ChunkData^, GlobalPalette^, Chunk.DataSize);
|
|
GlobalPaletteEntries := Chunk.DataSize div 3;
|
|
end
|
|
else if GetLastFrame.Palette = nil then
|
|
begin
|
|
if (Chunk.DataSize = 0) and (GlobalPalette <> nil) then
|
|
begin
|
|
// Use global palette
|
|
GetMem(GetLastFrame.Palette, GlobalPaletteEntries * SizeOf(TColor24Rec));
|
|
Move(GlobalPalette^, GetLastFrame.Palette^, GlobalPaletteEntries * SizeOf(TColor24Rec));
|
|
GetLastFrame.PaletteEntries := GlobalPaletteEntries;
|
|
end
|
|
else
|
|
begin
|
|
// Load pal from PLTE chunk
|
|
GetMem(GetLastFrame.Palette, Chunk.DataSize);
|
|
Move(ChunkData^, GetLastFrame.Palette^, Chunk.DataSize);
|
|
GetLastFrame.PaletteEntries := Chunk.DataSize div 3;
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
procedure LoadtRNS;
|
|
begin
|
|
ReadChunkData;
|
|
if GetLastFrame = nil then
|
|
begin
|
|
// Load global transparency
|
|
GetMem(GlobalTransparency, Chunk.DataSize);
|
|
Move(ChunkData^, GlobalTransparency^, Chunk.DataSize);
|
|
GlobalTransparencySize := Chunk.DataSize;
|
|
end
|
|
else if GetLastFrame.Transparency = nil then
|
|
begin
|
|
if (Chunk.DataSize = 0) and (GlobalTransparency <> nil) then
|
|
begin
|
|
// Use global transparency
|
|
GetMem(GetLastFrame.Transparency, GlobalTransparencySize);
|
|
Move(GlobalTransparency^, GetLastFrame.Transparency^, Chunk.DataSize);
|
|
GetLastFrame.TransparencySize := GlobalTransparencySize;
|
|
end
|
|
else
|
|
begin
|
|
// Load pal from tRNS chunk
|
|
GetMem(GetLastFrame.Transparency, Chunk.DataSize);
|
|
Move(ChunkData^, GetLastFrame.Transparency^, Chunk.DataSize);
|
|
GetLastFrame.TransparencySize := Chunk.DataSize;
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
procedure LoadbKGD;
|
|
begin
|
|
ReadChunkData;
|
|
if GetLastFrame.Background = nil then
|
|
begin
|
|
GetMem(GetLastFrame.Background, Chunk.DataSize);
|
|
Move(ChunkData^, GetLastFrame.Background^, Chunk.DataSize);
|
|
GetLastFrame.BackgroundSize := Chunk.DataSize;
|
|
end;
|
|
end;
|
|
|
|
procedure HandleacTL;
|
|
begin
|
|
FileType := ngAPNG;
|
|
ReadChunkData;
|
|
acTL := PacTL(ChunkData)^;
|
|
SwapEndianLongWord(@acTL, SizeOf(acTL) div SizeOf(LongWord));
|
|
end;
|
|
|
|
begin
|
|
Result := False;
|
|
Clear;
|
|
ChunkData := nil;
|
|
with GetIO do
|
|
try
|
|
Read(Handle, @Sig, SizeOf(Sig));
|
|
// Set file type according to the signature
|
|
if Sig = PNGSignature then FileType := ngPNG
|
|
else if Sig = MNGSignature then FileType := ngMNG
|
|
else if Sig = JNGSignature then FileType := ngJNG
|
|
else Exit;
|
|
|
|
if FileType = ngMNG then
|
|
begin
|
|
// Store MNG header if present
|
|
ReadChunk;
|
|
ReadChunkData;
|
|
MHDR := PMHDR(ChunkData)^;
|
|
SwapEndianLongWord(@MHDR, SizeOf(MHDR) div SizeOf(LongWord));
|
|
end;
|
|
|
|
// Read chunks until ending chunk or EOF is reached
|
|
repeat
|
|
ReadChunk;
|
|
if (Chunk.ChunkID = IHDRChunk) or (Chunk.ChunkID = fcTLChunk) then StartNewPNGImage
|
|
else if Chunk.ChunkID = JHDRChunk then StartNewJNGImage
|
|
else if (Chunk.ChunkID = IDATChunk) or (Chunk.ChunkID = fdATChunk) then AppendIDAT
|
|
else if Chunk.ChunkID = JDATChunk then AppendJDAT
|
|
else if Chunk.ChunkID = JDAAChunk then AppendJDAA
|
|
else if Chunk.ChunkID = PLTEChunk then LoadPLTE
|
|
else if Chunk.ChunkID = tRNSChunk then LoadtRNS
|
|
else if Chunk.ChunkID = bKGDChunk then LoadbKGD
|
|
else if Chunk.ChunkID = acTLChunk then HandleacTL
|
|
else SkipChunkData;
|
|
until Eof(Handle) or (Chunk.ChunkID = MENDChunk) or
|
|
((FileType <> ngMNG) and (Chunk.ChunkID = IENDChunk));
|
|
|
|
Result := True;
|
|
finally
|
|
FreeMemNil(ChunkData);
|
|
end;
|
|
end;
|
|
|
|
procedure TNGFileLoader.LoadImageFromPNGFrame(FrameWidth, FrameHeight: LongInt; const IHDR: TIHDR;
|
|
IDATStream: TMemoryStream; var Image: TImageData);
|
|
type
|
|
TGetPixelFunc = function(Line: PByteArray; X: LongInt): Byte;
|
|
var
|
|
LineBuffer: array[Boolean] of PByteArray;
|
|
ActLine: Boolean;
|
|
Data, TotalBuffer, ZeroLine, PrevLine: Pointer;
|
|
BitCount, TotalSize, TotalPos, BytesPerPixel, I, Pass,
|
|
SrcDataSize, BytesPerLine, InterlaceLineBytes, InterlaceWidth: LongInt;
|
|
|
|
procedure DecodeAdam7;
|
|
const
|
|
BitTable: array[1..8] of LongInt = ($1, $3, 0, $F, 0, 0, 0, $FF);
|
|
StartBit: array[1..8] of LongInt = (7, 6, 0, 4, 0, 0, 0, 0);
|
|
var
|
|
Src, Dst, Dst2: PByte;
|
|
CurBit, Col: LongInt;
|
|
begin
|
|
Src := @LineBuffer[ActLine][1];
|
|
Col := ColumnStart[Pass];
|
|
with Image do
|
|
case BitCount of
|
|
1, 2, 4:
|
|
begin
|
|
Dst := @PByteArray(Data)[I * BytesPerLine];
|
|
repeat
|
|
CurBit := StartBit[BitCount];
|
|
repeat
|
|
Dst2 := @PByteArray(Dst)[(BitCount * Col) shr 3];
|
|
Dst2^ := Dst2^ or ((Src^ shr CurBit) and BitTable[BitCount])
|
|
shl (StartBit[BitCount] - (Col * BitCount mod 8));
|
|
Inc(Col, ColumnIncrement[Pass]);
|
|
Dec(CurBit, BitCount);
|
|
until CurBit < 0;
|
|
Inc(Src);
|
|
until Col >= Width;
|
|
end;
|
|
else
|
|
begin
|
|
Dst := @PByteArray(Data)[I * BytesPerLine + Col * BytesPerPixel];
|
|
repeat
|
|
CopyPixel(Src, Dst, BytesPerPixel);
|
|
Inc(Dst, BytesPerPixel);
|
|
Inc(Src, BytesPerPixel);
|
|
Inc(Dst, ColumnIncrement[Pass] * BytesPerPixel - BytesPerPixel);
|
|
Inc(Col, ColumnIncrement[Pass]);
|
|
until Col >= Width;
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
procedure FilterScanline(Filter: Byte; BytesPerPixel: LongInt; Line, PrevLine, Target: PByteArray;
|
|
BytesPerLine: LongInt);
|
|
var
|
|
I: LongInt;
|
|
begin
|
|
case Filter of
|
|
0:
|
|
begin
|
|
// No filter
|
|
Move(Line^, Target^, BytesPerLine);
|
|
end;
|
|
1:
|
|
begin
|
|
// Sub filter
|
|
Move(Line^, Target^, BytesPerPixel);
|
|
for I := BytesPerPixel to BytesPerLine - 1 do
|
|
Target[I] := (Line[I] + Target[I - BytesPerPixel]) and $FF;
|
|
end;
|
|
2:
|
|
begin
|
|
// Up filter
|
|
for I := 0 to BytesPerLine - 1 do
|
|
Target[I] := (Line[I] + PrevLine[I]) and $FF;
|
|
end;
|
|
3:
|
|
begin
|
|
// Average filter
|
|
for I := 0 to BytesPerPixel - 1 do
|
|
Target[I] := (Line[I] + PrevLine[I] shr 1) and $FF;
|
|
for I := BytesPerPixel to BytesPerLine - 1 do
|
|
Target[I] := (Line[I] + (Target[I - BytesPerPixel] + PrevLine[I]) shr 1) and $FF;
|
|
end;
|
|
4:
|
|
begin
|
|
// Paeth filter
|
|
for I := 0 to BytesPerPixel - 1 do
|
|
Target[I] := (Line[I] + PaethPredictor(0, PrevLine[I], 0)) and $FF;
|
|
for I := BytesPerPixel to BytesPerLine - 1 do
|
|
Target[I] := (Line[I] + PaethPredictor(Target[I - BytesPerPixel], PrevLine[I], PrevLine[I - BytesPerPixel])) and $FF;
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
procedure Convert124To8(DataIn: Pointer; DataOut: Pointer; Width, Height,
|
|
WidthBytes: LongInt; Indexed: Boolean);
|
|
var
|
|
X, Y, Mul: LongInt;
|
|
GetPixel: TGetPixelFunc;
|
|
begin
|
|
GetPixel := Get1BitPixel;
|
|
Mul := 255;
|
|
case IHDR.BitDepth of
|
|
2:
|
|
begin
|
|
Mul := 85;
|
|
GetPixel := Get2BitPixel;
|
|
end;
|
|
4:
|
|
begin
|
|
Mul := 17;
|
|
GetPixel := Get4BitPixel;
|
|
end;
|
|
end;
|
|
if Indexed then Mul := 1;
|
|
|
|
for Y := 0 to Height - 1 do
|
|
for X := 0 to Width - 1 do
|
|
PByteArray(DataOut)[Y * Width + X] :=
|
|
GetPixel(@PByteArray(DataIn)[Y * WidthBytes], X) * Mul;
|
|
end;
|
|
|
|
procedure TransformLOCOToRGB(Data: PByte; NumPixels, BytesPerPixel: LongInt);
|
|
var
|
|
I: LongInt;
|
|
begin
|
|
for I := 0 to NumPixels - 1 do
|
|
begin
|
|
if IHDR.BitDepth = 8 then
|
|
begin
|
|
PColor32Rec(Data).R := Byte(PColor32Rec(Data).R + PColor32Rec(Data).G);
|
|
PColor32Rec(Data).B := Byte(PColor32Rec(Data).B + PColor32Rec(Data).G);
|
|
end
|
|
else
|
|
begin
|
|
PColor64Rec(Data).R := Word(PColor64Rec(Data).R + PColor64Rec(Data).G);
|
|
PColor64Rec(Data).B := Word(PColor64Rec(Data).B + PColor64Rec(Data).G);
|
|
end;
|
|
Inc(Data, BytesPerPixel);
|
|
end;
|
|
end;
|
|
|
|
begin
|
|
Image.Width := FrameWidth;
|
|
Image.Height := FrameHeight;
|
|
Image.Format := ifUnknown;
|
|
|
|
case IHDR.ColorType of
|
|
0:
|
|
begin
|
|
// Gray scale image
|
|
case IHDR.BitDepth of
|
|
1, 2, 4, 8: Image.Format := ifGray8;
|
|
16: Image.Format := ifGray16;
|
|
end;
|
|
BitCount := IHDR.BitDepth;
|
|
end;
|
|
2:
|
|
begin
|
|
// RGB image
|
|
case IHDR.BitDepth of
|
|
8: Image.Format := ifR8G8B8;
|
|
16: Image.Format := ifR16G16B16;
|
|
end;
|
|
BitCount := IHDR.BitDepth * 3;
|
|
end;
|
|
3:
|
|
begin
|
|
// Indexed image
|
|
case IHDR.BitDepth of
|
|
1, 2, 4, 8: Image.Format := ifIndex8;
|
|
end;
|
|
BitCount := IHDR.BitDepth;
|
|
end;
|
|
4:
|
|
begin
|
|
// Grayscale + alpha image
|
|
case IHDR.BitDepth of
|
|
8: Image.Format := ifA8Gray8;
|
|
16: Image.Format := ifA16Gray16;
|
|
end;
|
|
BitCount := IHDR.BitDepth * 2;
|
|
end;
|
|
6:
|
|
begin
|
|
// ARGB image
|
|
case IHDR.BitDepth of
|
|
8: Image.Format := ifA8R8G8B8;
|
|
16: Image.Format := ifA16R16G16B16;
|
|
end;
|
|
BitCount := IHDR.BitDepth * 4;
|
|
end;
|
|
end;
|
|
|
|
// Start decoding
|
|
LineBuffer[True] := nil;
|
|
LineBuffer[False] := nil;
|
|
TotalBuffer := nil;
|
|
ZeroLine := nil;
|
|
BytesPerPixel := (BitCount + 7) div 8;
|
|
ActLine := True;
|
|
with Image do
|
|
try
|
|
BytesPerLine := (Width * BitCount + 7) div 8;
|
|
SrcDataSize := Height * BytesPerLine;
|
|
GetMem(Data, SrcDataSize);
|
|
FillChar(Data^, SrcDataSize, 0);
|
|
GetMem(ZeroLine, BytesPerLine);
|
|
FillChar(ZeroLine^, BytesPerLine, 0);
|
|
|
|
if IHDR.Interlacing = 1 then
|
|
begin
|
|
// Decode interlaced images
|
|
TotalPos := 0;
|
|
DecompressBuf(IDATStream.Memory, IDATStream.Size, 0,
|
|
Pointer(TotalBuffer), TotalSize);
|
|
GetMem(LineBuffer[True], BytesPerLine + 1);
|
|
GetMem(LineBuffer[False], BytesPerLine + 1);
|
|
for Pass := 0 to 6 do
|
|
begin
|
|
// Prepare next interlace run
|
|
if Width <= ColumnStart[Pass] then
|
|
Continue;
|
|
InterlaceWidth := (Width + ColumnIncrement[Pass] - 1 -
|
|
ColumnStart[Pass]) div ColumnIncrement[Pass];
|
|
InterlaceLineBytes := (InterlaceWidth * BitCount + 7) shr 3;
|
|
I := RowStart[Pass];
|
|
FillChar(LineBuffer[True][0], BytesPerLine + 1, 0);
|
|
FillChar(LineBuffer[False][0], BytesPerLine + 1, 0);
|
|
while I < Height do
|
|
begin
|
|
// Copy line from decompressed data to working buffer
|
|
Move(PByteArray(TotalBuffer)[TotalPos],
|
|
LineBuffer[ActLine][0], InterlaceLineBytes + 1);
|
|
Inc(TotalPos, InterlaceLineBytes + 1);
|
|
// Swap red and blue channels if necessary
|
|
if (IHDR.ColorType in [2, 6]) then
|
|
SwapRGB(@LineBuffer[ActLine][1], InterlaceWidth, IHDR.BitDepth, BytesPerPixel);
|
|
// Reverse-filter current scanline
|
|
FilterScanline(LineBuffer[ActLine][0], BytesPerPixel,
|
|
@LineBuffer[ActLine][1], @LineBuffer[not ActLine][1],
|
|
@LineBuffer[ActLine][1], InterlaceLineBytes);
|
|
// Decode Adam7 interlacing
|
|
DecodeAdam7;
|
|
ActLine := not ActLine;
|
|
// Continue with next row in interlaced order
|
|
Inc(I, RowIncrement[Pass]);
|
|
end;
|
|
end;
|
|
end
|
|
else
|
|
begin
|
|
// Decode non-interlaced images
|
|
PrevLine := ZeroLine;
|
|
DecompressBuf(IDATStream.Memory, IDATStream.Size, SrcDataSize + Height,
|
|
Pointer(TotalBuffer), TotalSize);
|
|
for I := 0 to Height - 1 do
|
|
begin
|
|
// Swap red and blue channels if necessary
|
|
if IHDR.ColorType in [2, 6] then
|
|
SwapRGB(@PByteArray(TotalBuffer)[I * (BytesPerLine + 1) + 1], Width,
|
|
IHDR.BitDepth, BytesPerPixel);
|
|
// reverse-filter current scanline
|
|
FilterScanline(PByteArray(TotalBuffer)[I * (BytesPerLine + 1)],
|
|
BytesPerPixel, @PByteArray(TotalBuffer)[I * (BytesPerLine + 1) + 1],
|
|
PrevLine, @PByteArray(Data)[I * BytesPerLine], BytesPerLine);
|
|
PrevLine := @PByteArray(Data)[I * BytesPerLine];
|
|
end;
|
|
end;
|
|
|
|
Size := Width * Height * BytesPerPixel;
|
|
|
|
if Size <> SrcDataSize then
|
|
begin
|
|
// If source data size is different from size of image in assigned
|
|
// format we must convert it (it is in 1/2/4 bit count)
|
|
GetMem(Bits, Size);
|
|
case IHDR.ColorType of
|
|
0: Convert124To8(Data, Bits, Width, Height, BytesPerLine, False);
|
|
3: Convert124To8(Data, Bits, Width, Height, BytesPerLine, True);
|
|
end;
|
|
FreeMem(Data);
|
|
end
|
|
else
|
|
begin
|
|
// If source data size is the same as size of
|
|
// image Bits in assigned format we simply copy pointer reference
|
|
Bits := Data;
|
|
end;
|
|
|
|
// LOCO transformation was used too (only for color types 2 and 6)
|
|
if (IHDR.Filter = 64) and (IHDR.ColorType in [2, 6]) then
|
|
TransformLOCOToRGB(Bits, Width * Height, BytesPerPixel);
|
|
|
|
// Images with 16 bit channels must be swapped because of PNG's big endianity
|
|
if IHDR.BitDepth = 16 then
|
|
SwapEndianWord(Bits, Width * Height * BytesPerPixel div SizeOf(Word));
|
|
finally
|
|
FreeMem(LineBuffer[True]);
|
|
FreeMem(LineBuffer[False]);
|
|
FreeMem(TotalBuffer);
|
|
FreeMem(ZeroLine);
|
|
end;
|
|
end;
|
|
|
|
{$IFNDEF DONT_LINK_JNG}
|
|
|
|
procedure TNGFileLoader.LoadImageFromJNGFrame(FrameWidth, FrameHeight: LongInt; const JHDR: TJHDR; IDATStream,
|
|
JDATStream, JDAAStream: TMemoryStream; var Image: TImageData);
|
|
var
|
|
AlphaImage: TImageData;
|
|
FakeIHDR: TIHDR;
|
|
FmtInfo: TImageFormatInfo;
|
|
I: LongInt;
|
|
AlphaPtr: PByte;
|
|
GrayPtr: PWordRec;
|
|
ColorPtr: PColor32Rec;
|
|
|
|
procedure LoadJpegFromStream(Stream: TStream; var DestImage: TImageData);
|
|
var
|
|
JpegFormat: TCustomIOJpegFileFormat;
|
|
Handle: TImagingHandle;
|
|
DynImages: TDynImageDataArray;
|
|
begin
|
|
if JHDR.SampleDepth <> 12 then
|
|
begin
|
|
JpegFormat := TCustomIOJpegFileFormat.Create;
|
|
JpegFormat.SetCustomIO(StreamIO);
|
|
Stream.Position := 0;
|
|
Handle := StreamIO.OpenRead(Pointer(Stream));
|
|
try
|
|
JpegFormat.LoadData(Handle, DynImages, True);
|
|
DestImage := DynImages[0];
|
|
finally
|
|
StreamIO.Close(Handle);
|
|
JpegFormat.Free;
|
|
SetLength(DynImages, 0);
|
|
end;
|
|
end
|
|
else
|
|
NewImage(FrameWidth, FrameHeight, ifR8G8B8, DestImage);
|
|
end;
|
|
|
|
begin
|
|
LoadJpegFromStream(JDATStream, Image);
|
|
|
|
// If present separate alpha channel is processed
|
|
if (JHDR.ColorType in [12, 14]) and (Image.Format in [ifGray8, ifR8G8B8]) then
|
|
begin
|
|
InitImage(AlphaImage);
|
|
if JHDR.AlphaCompression = 0 then
|
|
begin
|
|
// Alpha channel is PNG compressed
|
|
FakeIHDR.Width := JHDR.Width;
|
|
FakeIHDR.Height := JHDR.Height;
|
|
FakeIHDR.ColorType := 0;
|
|
FakeIHDR.BitDepth := JHDR.AlphaSampleDepth;
|
|
FakeIHDR.Filter := JHDR.AlphaFilter;
|
|
FakeIHDR.Interlacing := JHDR.AlphaInterlacing;
|
|
|
|
LoadImageFromPNGFrame(FrameWidth, FrameHeight, FakeIHDR, IDATStream, AlphaImage);
|
|
end
|
|
else
|
|
begin
|
|
// Alpha channel is JPEG compressed
|
|
LoadJpegFromStream(JDAAStream, AlphaImage);
|
|
end;
|
|
|
|
// Check if alpha channel is the same size as image
|
|
if (Image.Width <> AlphaImage.Width) and (Image.Height <> AlphaImage.Height) then
|
|
ResizeImage(AlphaImage, Image.Width, Image.Height, rfNearest);
|
|
|
|
// Check alpha channels data format
|
|
GetImageFormatInfo(AlphaImage.Format, FmtInfo);
|
|
if (FmtInfo.BytesPerPixel > 1) or (not FmtInfo.HasGrayChannel) then
|
|
ConvertImage(AlphaImage, ifGray8);
|
|
|
|
// Convert image to fromat with alpha channel
|
|
if Image.Format = ifGray8 then
|
|
ConvertImage(Image, ifA8Gray8)
|
|
else
|
|
ConvertImage(Image, ifA8R8G8B8);
|
|
|
|
// Combine alpha channel with image
|
|
AlphaPtr := AlphaImage.Bits;
|
|
if Image.Format = ifA8Gray8 then
|
|
begin
|
|
GrayPtr := Image.Bits;
|
|
for I := 0 to Image.Width * Image.Height - 1 do
|
|
begin
|
|
GrayPtr.High := AlphaPtr^;
|
|
Inc(GrayPtr);
|
|
Inc(AlphaPtr);
|
|
end;
|
|
end
|
|
else
|
|
begin
|
|
ColorPtr := Image.Bits;
|
|
for I := 0 to Image.Width * Image.Height - 1 do
|
|
begin
|
|
ColorPtr.A := AlphaPtr^;
|
|
Inc(ColorPtr);
|
|
Inc(AlphaPtr);
|
|
end;
|
|
end;
|
|
|
|
FreeImage(AlphaImage);
|
|
end;
|
|
end;
|
|
|
|
{$ENDIF}
|
|
|
|
procedure TNGFileLoader.ApplyFrameSettings(Frame: TFrameInfo; var Image: TImageData);
|
|
var
|
|
FmtInfo: TImageFormatInfo;
|
|
BackGroundColor: TColor64Rec;
|
|
ColorKey: TColor64Rec;
|
|
Alphas: PByteArray;
|
|
AlphasSize: LongInt;
|
|
IsColorKeyPresent: Boolean;
|
|
IsBackGroundPresent: Boolean;
|
|
IsColorFormat: Boolean;
|
|
|
|
procedure ConverttRNS;
|
|
begin
|
|
if FmtInfo.IsIndexed then
|
|
begin
|
|
if Alphas = nil then
|
|
begin
|
|
GetMem(Alphas, Frame.TransparencySize);
|
|
Move(Frame.Transparency^, Alphas^, Frame.TransparencySize);
|
|
AlphasSize := Frame.TransparencySize;
|
|
end;
|
|
end
|
|
else if not FmtInfo.HasAlphaChannel then
|
|
begin
|
|
FillChar(ColorKey, SizeOf(ColorKey), 0);
|
|
Move(Frame.Transparency^, ColorKey, Min(Frame.TransparencySize, SizeOf(ColorKey)));
|
|
if IsColorFormat then
|
|
SwapValues(ColorKey.R, ColorKey.B);
|
|
SwapEndianWord(@ColorKey, 3);
|
|
// 1/2/4 bit images were converted to 8 bit so we must convert color key too
|
|
if (not Frame.IsJpegFrame) and (Frame.IHDR.ColorType in [0, 4]) then
|
|
case Frame.IHDR.BitDepth of
|
|
1: ColorKey.B := Word(ColorKey.B * 255);
|
|
2: ColorKey.B := Word(ColorKey.B * 85);
|
|
4: ColorKey.B := Word(ColorKey.B * 17);
|
|
end;
|
|
IsColorKeyPresent := True;
|
|
end;
|
|
end;
|
|
|
|
procedure ConvertbKGD;
|
|
begin
|
|
FillChar(BackGroundColor, SizeOf(BackGroundColor), 0);
|
|
Move(Frame.Background^, BackGroundColor, Min(Frame.BackgroundSize,
|
|
SizeOf(BackGroundColor)));
|
|
if IsColorFormat then
|
|
SwapValues(BackGroundColor.R, BackGroundColor.B);
|
|
SwapEndianWord(@BackGroundColor, 3);
|
|
// 1/2/4 bit images were converted to 8 bit so we must convert back color too
|
|
if (not Frame.IsJpegFrame) and (Frame.IHDR.ColorType in [0, 4]) then
|
|
case Frame.IHDR.BitDepth of
|
|
1: BackGroundColor.B := Word(BackGroundColor.B * 255);
|
|
2: BackGroundColor.B := Word(BackGroundColor.B * 85);
|
|
4: BackGroundColor.B := Word(BackGroundColor.B * 17);
|
|
end;
|
|
IsBackGroundPresent := True;
|
|
end;
|
|
|
|
procedure ReconstructPalette;
|
|
var
|
|
I: LongInt;
|
|
begin
|
|
with Image do
|
|
begin
|
|
GetMem(Palette, FmtInfo.PaletteEntries * SizeOf(TColor32Rec));
|
|
FillChar(Palette^, FmtInfo.PaletteEntries * SizeOf(TColor32Rec), $FF);
|
|
// if RGB palette was loaded from file then use it
|
|
if Frame.Palette <> nil then
|
|
for I := 0 to Min(Frame.PaletteEntries, FmtInfo.PaletteEntries) - 1 do
|
|
with Palette[I] do
|
|
begin
|
|
R := Frame.Palette[I].B;
|
|
G := Frame.Palette[I].G;
|
|
B := Frame.Palette[I].R;
|
|
end;
|
|
// if palette alphas were loaded from file then use them
|
|
if Alphas <> nil then
|
|
for I := 0 to Min(AlphasSize, FmtInfo.PaletteEntries) - 1 do
|
|
Palette[I].A := Alphas[I];
|
|
end;
|
|
end;
|
|
|
|
procedure ApplyColorKey;
|
|
var
|
|
DestFmt: TImageFormat;
|
|
OldPixel, NewPixel: Pointer;
|
|
begin
|
|
case Image.Format of
|
|
ifGray8: DestFmt := ifA8Gray8;
|
|
ifGray16: DestFmt := ifA16Gray16;
|
|
ifR8G8B8: DestFmt := ifA8R8G8B8;
|
|
ifR16G16B16: DestFmt := ifA16R16G16B16;
|
|
else
|
|
DestFmt := ifUnknown;
|
|
end;
|
|
if DestFmt <> ifUnknown then
|
|
begin
|
|
if not IsBackGroundPresent then
|
|
BackGroundColor := ColorKey;
|
|
ConvertImage(Image, DestFmt);
|
|
OldPixel := @ColorKey;
|
|
NewPixel := @BackGroundColor;
|
|
// Now back color and color key must be converted to image's data format, looks ugly
|
|
case Image.Format of
|
|
ifA8Gray8:
|
|
begin
|
|
TColor32Rec(TInt64Rec(ColorKey).Low).B := Byte(ColorKey.B);
|
|
TColor32Rec(TInt64Rec(ColorKey).Low).G := $FF;
|
|
TColor32Rec(TInt64Rec(BackGroundColor).Low).B := Byte(BackGroundColor.B);
|
|
end;
|
|
ifA16Gray16:
|
|
begin
|
|
ColorKey.G := $FFFF;
|
|
end;
|
|
ifA8R8G8B8:
|
|
begin
|
|
TColor32Rec(TInt64Rec(ColorKey).Low).R := Byte(ColorKey.R);
|
|
TColor32Rec(TInt64Rec(ColorKey).Low).G := Byte(ColorKey.G);
|
|
TColor32Rec(TInt64Rec(ColorKey).Low).B := Byte(ColorKey.B);
|
|
TColor32Rec(TInt64Rec(ColorKey).Low).A := $FF;
|
|
TColor32Rec(TInt64Rec(BackGroundColor).Low).R := Byte(BackGroundColor.R);
|
|
TColor32Rec(TInt64Rec(BackGroundColor).Low).G := Byte(BackGroundColor.G);
|
|
TColor32Rec(TInt64Rec(BackGroundColor).Low).B := Byte(BackGroundColor.B);
|
|
end;
|
|
ifA16R16G16B16:
|
|
begin
|
|
ColorKey.A := $FFFF;
|
|
end;
|
|
end;
|
|
ReplaceColor(Image, 0, 0, Image.Width, Image.Height, OldPixel, NewPixel);
|
|
end;
|
|
end;
|
|
|
|
begin
|
|
Alphas := nil;
|
|
IsColorKeyPresent := False;
|
|
IsBackGroundPresent := False;
|
|
GetImageFormatInfo(Image.Format, FmtInfo);
|
|
|
|
IsColorFormat := (Frame.IsJpegFrame and (Frame.JHDR.ColorType in [10, 14])) or
|
|
(not Frame.IsJpegFrame and (Frame.IHDR.ColorType in [2, 6]));
|
|
|
|
// Convert some chunk data to useful format
|
|
if Frame.Transparency <> nil then
|
|
ConverttRNS;
|
|
if Frame.Background <> nil then
|
|
ConvertbKGD;
|
|
|
|
// Build palette for indexed images
|
|
if FmtInfo.IsIndexed then
|
|
ReconstructPalette;
|
|
|
|
// Apply color keying
|
|
if IsColorKeyPresent and not FmtInfo.HasAlphaChannel then
|
|
ApplyColorKey;
|
|
|
|
FreeMemNil(Alphas);
|
|
end;
|
|
|
|
{ TNGFileSaver class implementation }
|
|
|
|
procedure TNGFileSaver.StoreImageToPNGFrame(const IHDR: TIHDR; Bits: Pointer;
|
|
FmtInfo: TImageFormatInfo; IDATStream: TMemoryStream);
|
|
var
|
|
TotalBuffer, CompBuffer, ZeroLine, PrevLine: Pointer;
|
|
FilterLines: array[0..4] of PByteArray;
|
|
TotalSize, CompSize, I, BytesPerLine, BytesPerPixel: LongInt;
|
|
Filter: Byte;
|
|
Adaptive: Boolean;
|
|
|
|
procedure FilterScanline(Filter: Byte; BytesPerPixel: LongInt; Line, PrevLine, Target: PByteArray);
|
|
var
|
|
I: LongInt;
|
|
begin
|
|
case Filter of
|
|
0:
|
|
begin
|
|
// No filter
|
|
Move(Line^, Target^, BytesPerLine);
|
|
end;
|
|
1:
|
|
begin
|
|
// Sub filter
|
|
Move(Line^, Target^, BytesPerPixel);
|
|
for I := BytesPerPixel to BytesPerLine - 1 do
|
|
Target[I] := (Line[I] - Line[I - BytesPerPixel]) and $FF;
|
|
end;
|
|
2:
|
|
begin
|
|
// Up filter
|
|
for I := 0 to BytesPerLine - 1 do
|
|
Target[I] := (Line[I] - PrevLine[I]) and $FF;
|
|
end;
|
|
3:
|
|
begin
|
|
// Average filter
|
|
for I := 0 to BytesPerPixel - 1 do
|
|
Target[I] := (Line[I] - PrevLine[I] shr 1) and $FF;
|
|
for I := BytesPerPixel to BytesPerLine - 1 do
|
|
Target[I] := (Line[I] - (Line[I - BytesPerPixel] + PrevLine[I]) shr 1) and $FF;
|
|
end;
|
|
4:
|
|
begin
|
|
// Paeth filter
|
|
for I := 0 to BytesPerPixel - 1 do
|
|
Target[I] := (Line[I] - PaethPredictor(0, PrevLine[I], 0)) and $FF;
|
|
for I := BytesPerPixel to BytesPerLine - 1 do
|
|
Target[I] := (Line[I] - PaethPredictor(Line[I - BytesPerPixel], PrevLine[I], PrevLine[I - BytesPerPixel])) and $FF;
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
procedure AdaptiveFilter(var Filter: Byte; BytesPerPixel: LongInt; Line, PrevLine, Target: PByteArray);
|
|
var
|
|
I, J, BestTest: LongInt;
|
|
Sums: array[0..4] of LongInt;
|
|
begin
|
|
// Compute the output scanline using all five filters,
|
|
// and select the filter that gives the smallest sum of
|
|
// absolute values of outputs
|
|
FillChar(Sums, SizeOf(Sums), 0);
|
|
BestTest := MaxInt;
|
|
for I := 0 to 4 do
|
|
begin
|
|
FilterScanline(I, BytesPerPixel, Line, PrevLine, FilterLines[I]);
|
|
for J := 0 to BytesPerLine - 1 do
|
|
Sums[I] := Sums[I] + Abs(ShortInt(FilterLines[I][J]));
|
|
if Sums[I] < BestTest then
|
|
begin
|
|
Filter := I;
|
|
BestTest := Sums[I];
|
|
end;
|
|
end;
|
|
Move(FilterLines[Filter]^, Target^, BytesPerLine);
|
|
end;
|
|
|
|
begin
|
|
// Select precompression filter and compression level
|
|
Adaptive := False;
|
|
Filter := 0;
|
|
case PreFilter of
|
|
6:
|
|
if not ((IHDR.BitDepth < 8) or (IHDR.ColorType = 3))
|
|
then Adaptive := True;
|
|
0..4: Filter := PreFilter;
|
|
else
|
|
if IHDR.ColorType in [2, 6] then
|
|
Filter := 4
|
|
end;
|
|
// Prepare data for compression
|
|
CompBuffer := nil;
|
|
FillChar(FilterLines, SizeOf(FilterLines), 0);
|
|
BytesPerPixel := FmtInfo.BytesPerPixel;
|
|
BytesPerLine := LongInt(IHDR.Width) * BytesPerPixel;
|
|
TotalSize := (BytesPerLine + 1) * LongInt(IHDR.Height);
|
|
GetMem(TotalBuffer, TotalSize);
|
|
GetMem(ZeroLine, BytesPerLine);
|
|
FillChar(ZeroLine^, BytesPerLine, 0);
|
|
if Adaptive then
|
|
for I := 0 to 4 do
|
|
GetMem(FilterLines[I], BytesPerLine);
|
|
PrevLine := ZeroLine;
|
|
try
|
|
// Process next scanlines
|
|
for I := 0 to IHDR.Height - 1 do
|
|
begin
|
|
// Filter scanline
|
|
if Adaptive then
|
|
AdaptiveFilter(Filter, BytesPerPixel, @PByteArray(Bits)[I * BytesPerLine],
|
|
PrevLine, @PByteArray(TotalBuffer)[I * (BytesPerLine + 1) + 1])
|
|
else
|
|
FilterScanline(Filter, BytesPerPixel, @PByteArray(Bits)[I * BytesPerLine],
|
|
PrevLine, @PByteArray(TotalBuffer)[I * (BytesPerLine + 1) + 1]);
|
|
PrevLine := @PByteArray(Bits)[I * BytesPerLine];
|
|
// Swap red and blue if necessary
|
|
if (IHDR.ColorType in [2, 6]) and not FmtInfo.IsRBSwapped then
|
|
SwapRGB(@PByteArray(TotalBuffer)[I * (BytesPerLine + 1) + 1],
|
|
IHDR.Width, IHDR.BitDepth, FmtInfo.BytesPerPixel);
|
|
// Images with 16 bit channels must be swapped because of PNG's big endianess
|
|
if IHDR.BitDepth = 16 then
|
|
SwapEndianWord(@PByteArray(TotalBuffer)[I * (BytesPerLine + 1) + 1],
|
|
BytesPerLine div SizeOf(Word));
|
|
// Set filter used for this scanline
|
|
PByteArray(TotalBuffer)[I * (BytesPerLine + 1)] := Filter;
|
|
end;
|
|
// Compress IDAT data
|
|
CompressBuf(TotalBuffer, TotalSize, CompBuffer, CompSize, CompressLevel);
|
|
// Write IDAT data to stream
|
|
IDATStream.WriteBuffer(CompBuffer^, CompSize);
|
|
finally
|
|
FreeMem(TotalBuffer);
|
|
FreeMem(CompBuffer);
|
|
FreeMem(ZeroLine);
|
|
if Adaptive then
|
|
for I := 0 to 4 do
|
|
FreeMem(FilterLines[I]);
|
|
end;
|
|
end;
|
|
|
|
{$IFNDEF DONT_LINK_JNG}
|
|
|
|
procedure TNGFileSaver.StoreImageToJNGFrame(const JHDR: TJHDR;
|
|
const Image: TImageData; IDATStream, JDATStream,
|
|
JDAAStream: TMemoryStream);
|
|
var
|
|
ColorImage, AlphaImage: TImageData;
|
|
FmtInfo: TImageFormatInfo;
|
|
AlphaPtr: PByte;
|
|
GrayPtr: PWordRec;
|
|
ColorPtr: PColor32Rec;
|
|
I: LongInt;
|
|
FakeIHDR: TIHDR;
|
|
|
|
procedure SaveJpegToStream(Stream: TStream; const Image: TImageData);
|
|
var
|
|
JpegFormat: TCustomIOJpegFileFormat;
|
|
Handle: TImagingHandle;
|
|
DynImages: TDynImageDataArray;
|
|
begin
|
|
JpegFormat := TCustomIOJpegFileFormat.Create;
|
|
JpegFormat.SetCustomIO(StreamIO);
|
|
// Only JDAT stream can be saved progressive
|
|
if Stream = JDATStream then
|
|
JpegFormat.FProgressive := Progressive
|
|
else
|
|
JpegFormat.FProgressive := False;
|
|
JpegFormat.FQuality := Quality;
|
|
SetLength(DynImages, 1);
|
|
DynImages[0] := Image;
|
|
Handle := StreamIO.OpenWrite(Pointer(Stream));
|
|
try
|
|
JpegFormat.SaveData(Handle, DynImages, 0);
|
|
finally
|
|
StreamIO.Close(Handle);
|
|
SetLength(DynImages, 0);
|
|
JpegFormat.Free;
|
|
end;
|
|
end;
|
|
|
|
begin
|
|
GetImageFormatInfo(Image.Format, FmtInfo);
|
|
InitImage(ColorImage);
|
|
InitImage(AlphaImage);
|
|
|
|
if FmtInfo.HasAlphaChannel then
|
|
begin
|
|
// Create new image for alpha channel and color image without alpha
|
|
CloneImage(Image, ColorImage);
|
|
NewImage(Image.Width, Image.Height, ifGray8, AlphaImage);
|
|
case Image.Format of
|
|
ifA8Gray8: ConvertImage(ColorImage, ifGray8);
|
|
ifA8R8G8B8: ConvertImage(ColorImage, ifR8G8B8);
|
|
end;
|
|
|
|
// Store source image's alpha to separate image
|
|
AlphaPtr := AlphaImage.Bits;
|
|
if Image.Format = ifA8Gray8 then
|
|
begin
|
|
GrayPtr := Image.Bits;
|
|
for I := 0 to Image.Width * Image.Height - 1 do
|
|
begin
|
|
AlphaPtr^ := GrayPtr.High;
|
|
Inc(GrayPtr);
|
|
Inc(AlphaPtr);
|
|
end;
|
|
end
|
|
else
|
|
begin
|
|
ColorPtr := Image.Bits;
|
|
for I := 0 to Image.Width * Image.Height - 1 do
|
|
begin
|
|
AlphaPtr^ := ColorPtr.A;
|
|
Inc(ColorPtr);
|
|
Inc(AlphaPtr);
|
|
end;
|
|
end;
|
|
|
|
// Write color image to stream as JPEG
|
|
SaveJpegToStream(JDATStream, ColorImage);
|
|
|
|
if LossyAlpha then
|
|
begin
|
|
// Write alpha image to stream as JPEG
|
|
SaveJpegToStream(JDAAStream, AlphaImage);
|
|
end
|
|
else
|
|
begin
|
|
// Alpha channel is PNG compressed
|
|
FakeIHDR.Width := JHDR.Width;
|
|
FakeIHDR.Height := JHDR.Height;
|
|
FakeIHDR.ColorType := 0;
|
|
FakeIHDR.BitDepth := JHDR.AlphaSampleDepth;
|
|
FakeIHDR.Filter := JHDR.AlphaFilter;
|
|
FakeIHDR.Interlacing := JHDR.AlphaInterlacing;
|
|
|
|
GetImageFormatInfo(AlphaImage.Format, FmtInfo);
|
|
StoreImageToPNGFrame(FakeIHDR, AlphaImage.Bits, FmtInfo, IDATStream);
|
|
end;
|
|
|
|
FreeImage(ColorImage);
|
|
FreeImage(AlphaImage);
|
|
end
|
|
else
|
|
begin
|
|
// Simply write JPEG to stream
|
|
SaveJpegToStream(JDATStream, Image);
|
|
end;
|
|
end;
|
|
|
|
{$ENDIF}
|
|
|
|
procedure TNGFileSaver.AddFrame(const Image: TImageData; IsJpegFrame: Boolean);
|
|
var
|
|
Frame: TFrameInfo;
|
|
FmtInfo: TImageFormatInfo;
|
|
|
|
procedure StorePalette;
|
|
var
|
|
Pal: PPalette24;
|
|
Alphas: PByteArray;
|
|
I, PalBytes: LongInt;
|
|
AlphasDiffer: Boolean;
|
|
begin
|
|
// Fill and save RGB part of palette to PLTE chunk
|
|
PalBytes := FmtInfo.PaletteEntries * SizeOf(TColor24Rec);
|
|
GetMem(Pal, PalBytes);
|
|
AlphasDiffer := False;
|
|
for I := 0 to FmtInfo.PaletteEntries - 1 do
|
|
begin
|
|
Pal[I].B := Image.Palette[I].R;
|
|
Pal[I].G := Image.Palette[I].G;
|
|
Pal[I].R := Image.Palette[I].B;
|
|
if Image.Palette[I].A < 255 then
|
|
AlphasDiffer := True;
|
|
end;
|
|
Frame.Palette := Pal;
|
|
Frame.PaletteEntries := FmtInfo.PaletteEntries;
|
|
// Fill and save alpha part (if there are any alphas < 255) of palette to tRNS chunk
|
|
if AlphasDiffer then
|
|
begin
|
|
PalBytes := FmtInfo.PaletteEntries * SizeOf(Byte);
|
|
GetMem(Alphas, PalBytes);
|
|
for I := 0 to FmtInfo.PaletteEntries - 1 do
|
|
Alphas[I] := Image.Palette[I].A;
|
|
Frame.Transparency := Alphas;
|
|
Frame.TransparencySize := PalBytes;
|
|
end;
|
|
end;
|
|
|
|
begin
|
|
// Add new frame
|
|
Frame := AddFrameInfo;
|
|
Frame.IsJpegFrame := IsJpegFrame;
|
|
|
|
with Frame do
|
|
begin
|
|
GetImageFormatInfo(Image.Format, FmtInfo);
|
|
|
|
if IsJpegFrame then
|
|
begin
|
|
{$IFNDEF DONT_LINK_JNG}
|
|
// Fill JNG header
|
|
JHDR.Width := Image.Width;
|
|
JHDR.Height := Image.Height;
|
|
case Image.Format of
|
|
ifGray8: JHDR.ColorType := 8;
|
|
ifR8G8B8: JHDR.ColorType := 10;
|
|
ifA8Gray8: JHDR.ColorType := 12;
|
|
ifA8R8G8B8: JHDR.ColorType := 14;
|
|
end;
|
|
JHDR.SampleDepth := 8; // 8-bit samples and quantization tables
|
|
JHDR.Compression := 8; // Huffman coding
|
|
JHDR.Interlacing := Iff(Progressive, 8, 0);
|
|
JHDR.AlphaSampleDepth := Iff(FmtInfo.HasAlphaChannel, 8, 0);
|
|
JHDR.AlphaCompression := Iff(LossyAlpha, 8, 0);
|
|
JHDR.AlphaFilter := 0;
|
|
JHDR.AlphaInterlacing := 0;
|
|
|
|
StoreImageToJNGFrame(JHDR, Image, IDATMemory, JDATMemory, JDAAMemory);
|
|
|
|
// Finally swap endian
|
|
SwapEndianLongWord(@JHDR, 2);
|
|
{$ENDIF}
|
|
end
|
|
else
|
|
begin
|
|
// Fill PNG header
|
|
IHDR.Width := Image.Width;
|
|
IHDR.Height := Image.Height;
|
|
IHDR.Compression := 0;
|
|
IHDR.Filter := 0;
|
|
IHDR.Interlacing := 0;
|
|
IHDR.BitDepth := FmtInfo.BytesPerPixel * 8;
|
|
|
|
// Select appropiate PNG color type and modify bitdepth
|
|
if FmtInfo.HasGrayChannel then
|
|
begin
|
|
IHDR.ColorType := 0;
|
|
if FmtInfo.HasAlphaChannel then
|
|
begin
|
|
IHDR.ColorType := 4;
|
|
IHDR.BitDepth := IHDR.BitDepth div 2;
|
|
end;
|
|
end
|
|
else
|
|
begin
|
|
if FmtInfo.IsIndexed then
|
|
IHDR.ColorType := 3
|
|
else
|
|
if FmtInfo.HasAlphaChannel then
|
|
begin
|
|
IHDR.ColorType := 6;
|
|
IHDR.BitDepth := IHDR.BitDepth div 4;
|
|
end
|
|
else
|
|
begin
|
|
IHDR.ColorType := 2;
|
|
IHDR.BitDepth := IHDR.BitDepth div 3;
|
|
end;
|
|
end;
|
|
|
|
if FileType = ngAPNG then
|
|
begin
|
|
// Fill fcTL chunk of APNG file
|
|
fcTL.SeqNumber := 0; // Decided when writing to file
|
|
fcTL.Width := IHDR.Width;
|
|
fcTL.Height := IHDR.Height;
|
|
fcTL.XOffset := 0;
|
|
fcTL.YOffset := 0;
|
|
fcTL.DelayNumer := 1;
|
|
fcTL.DelayDenom := 3;
|
|
fcTL.DisposeOp := DisposeOpNone;
|
|
fcTL.BlendOp := BlendOpSource;
|
|
SwapEndianLongWord(@fcTL, 5);
|
|
fcTL.DelayNumer := SwapEndianWord(fcTL.DelayNumer);
|
|
fcTL.DelayDenom := SwapEndianWord(fcTL.DelayDenom);
|
|
end;
|
|
|
|
// Compress PNG image and store it to stream
|
|
StoreImageToPNGFrame(IHDR, Image.Bits, FmtInfo, IDATMemory);
|
|
// Store palette if necesary
|
|
if FmtInfo.IsIndexed then
|
|
StorePalette;
|
|
|
|
// Finally swap endian
|
|
SwapEndianLongWord(@IHDR, 2);
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
function TNGFileSaver.SaveFile(Handle: TImagingHandle): Boolean;
|
|
var
|
|
I: LongInt;
|
|
Chunk: TChunkHeader;
|
|
SeqNo: LongWord;
|
|
|
|
function GetNextSeqNo: LongWord;
|
|
begin
|
|
// Seq numbers of fcTL and fdAT are "interleaved" as they share the counter.
|
|
// Example: first fcTL for IDAT has seq=0, next is fcTL for seond frame with
|
|
// seq=1, then first fdAT with seq=2, fcTL seq=3, fdAT=4, ...
|
|
Result := SwapEndianLongWord(SeqNo);
|
|
Inc(SeqNo);
|
|
end;
|
|
|
|
function CalcChunkCrc(const ChunkHdr: TChunkHeader; Data: Pointer;
|
|
Size: LongInt): LongWord;
|
|
begin
|
|
Result := $FFFFFFFF;
|
|
CalcCrc32(Result, @ChunkHdr.ChunkID, SizeOf(ChunkHdr.ChunkID));
|
|
CalcCrc32(Result, Data, Size);
|
|
Result := SwapEndianLongWord(Result xor $FFFFFFFF);
|
|
end;
|
|
|
|
procedure WriteChunk(var Chunk: TChunkHeader; ChunkData: Pointer);
|
|
var
|
|
ChunkCrc: LongWord;
|
|
SizeToWrite: LongInt;
|
|
begin
|
|
SizeToWrite := Chunk.DataSize;
|
|
Chunk.DataSize := SwapEndianLongWord(Chunk.DataSize);
|
|
ChunkCrc := CalcChunkCrc(Chunk, ChunkData, SizeToWrite);
|
|
GetIO.Write(Handle, @Chunk, SizeOf(Chunk));
|
|
if SizeToWrite <> 0 then
|
|
GetIO.Write(Handle, ChunkData, SizeToWrite);
|
|
GetIO.Write(Handle, @ChunkCrc, SizeOf(ChunkCrc));
|
|
end;
|
|
|
|
procedure WritefdAT(Frame: TFrameInfo);
|
|
var
|
|
ChunkCrc: LongWord;
|
|
ChunkSeqNo: LongWord;
|
|
begin
|
|
Chunk.ChunkID := fdATChunk;
|
|
ChunkSeqNo := GetNextSeqNo;
|
|
// fdAT saves seq number LongWord before compressed pixels
|
|
Chunk.DataSize := Frame.IDATMemory.Size + SizeOf(LongWord);
|
|
Chunk.DataSize := SwapEndianLongWord(Chunk.DataSize);
|
|
// Calc CRC
|
|
ChunkCrc := $FFFFFFFF;
|
|
CalcCrc32(ChunkCrc, @Chunk.ChunkID, SizeOf(Chunk.ChunkID));
|
|
CalcCrc32(ChunkCrc, @ChunkSeqNo, SizeOf(ChunkSeqNo));
|
|
CalcCrc32(ChunkCrc, Frame.IDATMemory.Memory, Frame.IDATMemory.Size);
|
|
ChunkCrc := SwapEndianLongWord(ChunkCrc xor $FFFFFFFF);
|
|
// Write out all fdAT data
|
|
GetIO.Write(Handle, @Chunk, SizeOf(Chunk));
|
|
GetIO.Write(Handle, @ChunkSeqNo, SizeOf(ChunkSeqNo));
|
|
GetIO.Write(Handle, Frame.IDATMemory.Memory, Frame.IDATMemory.Size);
|
|
GetIO.Write(Handle, @ChunkCrc, SizeOf(ChunkCrc));
|
|
end;
|
|
|
|
procedure WritePNGMainImageChunks(Frame: TFrameInfo);
|
|
begin
|
|
with Frame do
|
|
begin
|
|
// Write IHDR chunk
|
|
Chunk.DataSize := SizeOf(IHDR);
|
|
Chunk.ChunkID := IHDRChunk;
|
|
WriteChunk(Chunk, @IHDR);
|
|
// Write PLTE chunk if data is present
|
|
if Palette <> nil then
|
|
begin
|
|
Chunk.DataSize := PaletteEntries * SizeOf(TColor24Rec);
|
|
Chunk.ChunkID := PLTEChunk;
|
|
WriteChunk(Chunk, Palette);
|
|
end;
|
|
// Write tRNS chunk if data is present
|
|
if Transparency <> nil then
|
|
begin
|
|
Chunk.DataSize := TransparencySize;
|
|
Chunk.ChunkID := tRNSChunk;
|
|
WriteChunk(Chunk, Transparency);
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
begin
|
|
Result := False;
|
|
SeqNo := 0;
|
|
|
|
case FileType of
|
|
ngPNG, ngAPNG: GetIO.Write(Handle, @PNGSignature, SizeOf(TChar8));
|
|
ngMNG: GetIO.Write(Handle, @MNGSignature, SizeOf(TChar8));
|
|
ngJNG: GetIO.Write(Handle, @JNGSignature, SizeOf(TChar8));
|
|
end;
|
|
|
|
if FileType = ngMNG then
|
|
begin
|
|
SwapEndianLongWord(@MHDR, SizeOf(MHDR) div SizeOf(LongWord));
|
|
Chunk.DataSize := SizeOf(MHDR);
|
|
Chunk.ChunkID := MHDRChunk;
|
|
WriteChunk(Chunk, @MHDR);
|
|
end;
|
|
|
|
for I := 0 to Length(Frames) - 1 do
|
|
with Frames[I] do
|
|
begin
|
|
if IsJpegFrame then
|
|
begin
|
|
// Write JHDR chunk
|
|
Chunk.DataSize := SizeOf(JHDR);
|
|
Chunk.ChunkID := JHDRChunk;
|
|
WriteChunk(Chunk, @JHDR);
|
|
// Write JNG image data
|
|
Chunk.DataSize := JDATMemory.Size;
|
|
Chunk.ChunkID := JDATChunk;
|
|
WriteChunk(Chunk, JDATMemory.Memory);
|
|
// Write alpha channel if present
|
|
if JHDR.AlphaSampleDepth > 0 then
|
|
begin
|
|
if JHDR.AlphaCompression = 0 then
|
|
begin
|
|
// Alpha is PNG compressed
|
|
Chunk.DataSize := IDATMemory.Size;
|
|
Chunk.ChunkID := IDATChunk;
|
|
WriteChunk(Chunk, IDATMemory.Memory);
|
|
end
|
|
else
|
|
begin
|
|
// Alpha is JNG compressed
|
|
Chunk.DataSize := JDAAMemory.Size;
|
|
Chunk.ChunkID := JDAAChunk;
|
|
WriteChunk(Chunk, JDAAMemory.Memory);
|
|
end;
|
|
end;
|
|
// Write image end
|
|
Chunk.DataSize := 0;
|
|
Chunk.ChunkID := IENDChunk;
|
|
WriteChunk(Chunk, nil);
|
|
end
|
|
else if FileType <> ngAPNG then
|
|
begin
|
|
// Regular PNG frame (single PNG image or MNG frame)
|
|
WritePNGMainImageChunks(Frames[I]);
|
|
// Write PNG image data
|
|
Chunk.DataSize := IDATMemory.Size;
|
|
Chunk.ChunkID := IDATChunk;
|
|
WriteChunk(Chunk, IDATMemory.Memory);
|
|
// Write image end
|
|
Chunk.DataSize := 0;
|
|
Chunk.ChunkID := IENDChunk;
|
|
WriteChunk(Chunk, nil);
|
|
end
|
|
else if FileType = ngAPNG then
|
|
begin
|
|
// APNG frame - first frame must have acTL and fcTL before IDAT,
|
|
// subsequent frames have fcTL and fdAT.
|
|
if I = 0 then
|
|
begin
|
|
WritePNGMainImageChunks(Frames[I]);
|
|
Chunk.DataSize := SizeOf(acTL);
|
|
Chunk.ChunkID := acTLChunk;
|
|
WriteChunk(Chunk, @acTL);
|
|
end;
|
|
// Write fcTL before frame data
|
|
Chunk.DataSize := SizeOf(fcTL);
|
|
Chunk.ChunkID := fcTLChunk;
|
|
fcTl.SeqNumber := GetNextSeqNo;
|
|
WriteChunk(Chunk, @fcTL);
|
|
// Write data - IDAT for first frame and fdAT for following ones
|
|
if I = 0 then
|
|
begin
|
|
Chunk.DataSize := IDATMemory.Size;
|
|
Chunk.ChunkID := IDATChunk;
|
|
WriteChunk(Chunk, IDATMemory.Memory);
|
|
end
|
|
else
|
|
WritefdAT(Frames[I]);
|
|
// Write image end after last frame
|
|
if I = Length(Frames) - 1 then
|
|
begin
|
|
Chunk.DataSize := 0;
|
|
Chunk.ChunkID := IENDChunk;
|
|
WriteChunk(Chunk, nil);
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
if FileType = ngMNG then
|
|
begin
|
|
Chunk.DataSize := 0;
|
|
Chunk.ChunkID := MENDChunk;
|
|
WriteChunk(Chunk, nil);
|
|
end;
|
|
end;
|
|
|
|
procedure TNGFileSaver.SetFileOptions(FileFormat: TNetworkGraphicsFileFormat);
|
|
begin
|
|
PreFilter := FileFormat.FPreFilter;
|
|
CompressLevel := FileFormat.FCompressLevel;
|
|
LossyAlpha := FileFormat.FLossyAlpha;
|
|
Quality := FileFormat.FQuality;
|
|
Progressive := FileFormat.FProgressive;
|
|
end;
|
|
|
|
{ TAPNGAnimator class implemnetation }
|
|
|
|
class procedure TAPNGAnimator.Animate(var Images: TDynImageDataArray;
|
|
const acTL: TacTL; const SrcFrames: array of TFrameInfo);
|
|
var
|
|
I, SrcIdx, Offset, Len: Integer;
|
|
DestFrames: TDynImageDataArray;
|
|
SrcCanvas, DestCanvas: TImagingCanvas;
|
|
PreviousCache: TImageData;
|
|
|
|
function AnimatingNeeded: Boolean;
|
|
var
|
|
I: Integer;
|
|
begin
|
|
Result := False;
|
|
for I := 0 to Len - 1 do
|
|
with SrcFrames[I] do
|
|
begin
|
|
if (FrameWidth <> IHDR.Width) or (FrameHeight <> IHDR.Height) or (Len <> acTL.NumFrames) or
|
|
(not ((fcTL.DisposeOp = DisposeOpNone) and (fcTL.BlendOp = BlendOpSource)) and
|
|
not ((fcTL.DisposeOp = DisposeOpBackground) and (fcTL.BlendOp = BlendOpSource)) and
|
|
not ((fcTL.DisposeOp = DisposeOpBackground) and (fcTL.BlendOp = BlendOpOver))) then
|
|
begin
|
|
Result := True;
|
|
Exit;
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
begin
|
|
Len := Length(SrcFrames);
|
|
if (Len = 0) or not AnimatingNeeded then
|
|
Exit;
|
|
|
|
if (Len = acTL.NumFrames + 1) and (SrcFrames[0].fcTL.Width = 0) then
|
|
begin
|
|
// If default image (stored in IDAT chunk) isn't part of animation we ignore it
|
|
Offset := 1;
|
|
Len := Len - 1;
|
|
end
|
|
else
|
|
Offset := 0;
|
|
|
|
SetLength(DestFrames, Len);
|
|
DestCanvas := ImagingCanvases.FindBestCanvasForImage(Images[0]).Create;
|
|
SrcCanvas := ImagingCanvases.FindBestCanvasForImage(Images[0]).Create;
|
|
InitImage(PreviousCache);
|
|
NewImage(SrcFrames[0].IHDR.Width, SrcFrames[0].IHDR.Height, Images[0].Format, PreviousCache);
|
|
|
|
for I := 0 to Len - 1 do
|
|
begin
|
|
SrcIdx := I + Offset;
|
|
NewImage(SrcFrames[SrcIdx].IHDR.Width, SrcFrames[SrcIdx].IHDR.Height,
|
|
Images[SrcIdx].Format, DestFrames[I]);
|
|
if DestFrames[I].Format = ifIndex8 then
|
|
Move(Images[SrcIdx].Palette^, DestFrames[I].Palette^, 256 * SizeOf(TColor32));
|
|
DestCanvas.CreateForData(@DestFrames[I]);
|
|
|
|
if (SrcFrames[SrcIdx].fcTL.DisposeOp = DisposeOpPrevious) and (SrcFrames[SrcIdx - 1].fcTL.DisposeOp <> DisposeOpPrevious) then
|
|
begin
|
|
// Cache current output buffer so we may return to it later (previous dispose op)
|
|
CopyRect(DestFrames[I - 1], 0, 0, DestFrames[I - 1].Width, DestFrames[I - 1].Height,
|
|
PreviousCache, 0, 0);
|
|
end;
|
|
|
|
if (I = 0) or (SrcIdx = 0) then
|
|
begin
|
|
// Clear whole frame with transparent black color (default for first frame)
|
|
DestCanvas.FillColor32 := pcClear;
|
|
DestCanvas.Clear;
|
|
end
|
|
else if SrcFrames[SrcIdx - 1].fcTL.DisposeOp = DisposeOpBackground then
|
|
begin
|
|
// Restore background color (clear) on previous frame's area and leave previous content outside of it
|
|
CopyRect(DestFrames[I - 1], 0, 0, DestFrames[I - 1].Width, DestFrames[I - 1].Height,
|
|
DestFrames[I], 0, 0);
|
|
DestCanvas.FillColor32 := pcClear;
|
|
DestCanvas.FillRect(BoundsToRect(SrcFrames[SrcIdx - 1].fcTL.XOffset, SrcFrames[SrcIdx - 1].fcTL.YOffset,
|
|
SrcFrames[SrcIdx - 1].FrameWidth, SrcFrames[SrcIdx - 1].FrameHeight));
|
|
end
|
|
else if SrcFrames[SrcIdx - 1].fcTL.DisposeOp = DisposeOpNone then
|
|
begin
|
|
// Clone previous frame - no change to output buffer
|
|
CopyRect(DestFrames[I - 1], 0, 0, DestFrames[I - 1].Width, DestFrames[I - 1].Height,
|
|
DestFrames[I], 0, 0);
|
|
end
|
|
else if SrcFrames[SrcIdx - 1].fcTL.DisposeOp = DisposeOpPrevious then
|
|
begin
|
|
// Revert to previous frame (cached, can't just restore DestFrames[I - 2])
|
|
CopyRect(PreviousCache, 0, 0, PreviousCache.Width, PreviousCache.Height,
|
|
DestFrames[I], 0, 0);
|
|
end;
|
|
|
|
// Copy pixels or alpha blend them over
|
|
if SrcFrames[SrcIdx].fcTL.BlendOp = BlendOpSource then
|
|
begin
|
|
CopyRect(Images[SrcIdx], 0, 0, Images[SrcIdx].Width, Images[SrcIdx].Height,
|
|
DestFrames[I], SrcFrames[SrcIdx].fcTL.XOffset, SrcFrames[SrcIdx].fcTL.YOffset);
|
|
end
|
|
else if SrcFrames[SrcIdx].fcTL.BlendOp = BlendOpOver then
|
|
begin
|
|
SrcCanvas.CreateForData(@Images[SrcIdx]);
|
|
SrcCanvas.DrawAlpha(SrcCanvas.ClipRect, DestCanvas,
|
|
SrcFrames[SrcIdx].fcTL.XOffset, SrcFrames[SrcIdx].fcTL.YOffset);
|
|
end;
|
|
|
|
FreeImage(Images[SrcIdx]);
|
|
end;
|
|
|
|
DestCanvas.Free;
|
|
SrcCanvas.Free;
|
|
FreeImage(PreviousCache);
|
|
|
|
// Assign dest frames to final output images
|
|
Images := DestFrames;
|
|
end;
|
|
|
|
{ TNetworkGraphicsFileFormat class implementation }
|
|
|
|
constructor TNetworkGraphicsFileFormat.Create;
|
|
begin
|
|
inherited Create;
|
|
FCanLoad := True;
|
|
FCanSave := True;
|
|
FIsMultiImageFormat := False;
|
|
|
|
FPreFilter := NGDefaultPreFilter;
|
|
FCompressLevel := NGDefaultCompressLevel;
|
|
FLossyAlpha := NGDefaultLossyAlpha;
|
|
FLossyCompression := NGDefaultLossyCompression;
|
|
FQuality := NGDefaultQuality;
|
|
FProgressive := NGDefaultProgressive;
|
|
end;
|
|
|
|
procedure TNetworkGraphicsFileFormat.CheckOptionsValidity;
|
|
begin
|
|
// Just check if save options has valid values
|
|
if not (FPreFilter in [0..6]) then
|
|
FPreFilter := NGDefaultPreFilter;
|
|
if not (FCompressLevel in [0..9]) then
|
|
FCompressLevel := NGDefaultCompressLevel;
|
|
if not (FQuality in [1..100]) then
|
|
FQuality := NGDefaultQuality;
|
|
end;
|
|
|
|
function TNetworkGraphicsFileFormat.GetSupportedFormats: TImageFormats;
|
|
begin
|
|
if FLossyCompression then
|
|
Result := NGLossyFormats
|
|
else
|
|
Result := NGLosslessFormats;
|
|
end;
|
|
|
|
procedure TNetworkGraphicsFileFormat.ConvertToSupported(var Image: TImageData;
|
|
const Info: TImageFormatInfo);
|
|
var
|
|
ConvFormat: TImageFormat;
|
|
begin
|
|
if not FLossyCompression then
|
|
begin
|
|
// Convert formats for lossless compression
|
|
if Info.HasGrayChannel then
|
|
begin
|
|
if Info.HasAlphaChannel then
|
|
begin
|
|
if Info.BytesPerPixel <= 2 then
|
|
// Convert <= 16bit grayscale images with alpha to ifA8Gray8
|
|
ConvFormat := ifA8Gray8
|
|
else
|
|
// Convert > 16bit grayscale images with alpha to ifA16Gray16
|
|
ConvFormat := ifA16Gray16
|
|
end
|
|
else
|
|
// Convert grayscale images without alpha to ifGray16
|
|
ConvFormat := ifGray16;
|
|
end
|
|
else
|
|
if Info.IsFloatingPoint then
|
|
// Convert floating point images to 64 bit ARGB (or RGB if no alpha)
|
|
ConvFormat := IffFormat(Info.HasAlphaChannel, ifA16B16G16R16, ifB16G16R16)
|
|
else if Info.HasAlphaChannel or Info.IsSpecial then
|
|
// Convert all other images with alpha or special images to A8R8G8B8
|
|
ConvFormat := ifA8R8G8B8
|
|
else
|
|
// Convert images without alpha to R8G8B8
|
|
ConvFormat := ifR8G8B8;
|
|
end
|
|
else
|
|
begin
|
|
// Convert formats for lossy compression
|
|
if Info.HasGrayChannel then
|
|
ConvFormat := IffFormat(Info.HasAlphaChannel, ifA8Gray8, ifGray8)
|
|
else
|
|
ConvFormat := IffFormat(Info.HasAlphaChannel, ifA8R8G8B8, ifR8G8B8);
|
|
end;
|
|
|
|
ConvertImage(Image, ConvFormat);
|
|
end;
|
|
|
|
function TNetworkGraphicsFileFormat.TestFormat(Handle: TImagingHandle): Boolean;
|
|
var
|
|
ReadCount: LongInt;
|
|
Sig: TChar8;
|
|
begin
|
|
Result := False;
|
|
if Handle <> nil then
|
|
with GetIO do
|
|
begin
|
|
FillChar(Sig, SizeOf(Sig), 0);
|
|
ReadCount := Read(Handle, @Sig, SizeOf(Sig));
|
|
Seek(Handle, -ReadCount, smFromCurrent);
|
|
Result := (ReadCount = SizeOf(Sig)) and (Sig = FSignature);
|
|
end;
|
|
end;
|
|
|
|
{ TPNGFileFormat class implementation }
|
|
|
|
constructor TPNGFileFormat.Create;
|
|
begin
|
|
inherited Create;
|
|
FName := SPNGFormatName;
|
|
FIsMultiImageFormat := True;
|
|
FLoadAnimated := PNGDefaultLoadAnimated;
|
|
AddMasks(SPNGMasks);
|
|
|
|
FSignature := PNGSignature;
|
|
|
|
RegisterOption(ImagingPNGPreFilter, @FPreFilter);
|
|
RegisterOption(ImagingPNGCompressLevel, @FCompressLevel);
|
|
RegisterOption(ImagingPNGLoadAnimated, @FLoadAnimated);
|
|
end;
|
|
|
|
function TPNGFileFormat.LoadData(Handle: TImagingHandle;
|
|
var Images: TDynImageDataArray; OnlyFirstLevel: Boolean): Boolean;
|
|
var
|
|
I, Len: LongInt;
|
|
NGFileLoader: TNGFileLoader;
|
|
begin
|
|
Result := False;
|
|
NGFileLoader := TNGFileLoader.Create;
|
|
try
|
|
// Use NG file parser to load file
|
|
if NGFileLoader.LoadFile(Handle) and (Length(NGFileLoader.Frames) > 0) then
|
|
begin
|
|
Len := Length(NGFileLoader.Frames);
|
|
SetLength(Images, Len);
|
|
for I := 0 to Len - 1 do
|
|
with NGFileLoader.Frames[I] do
|
|
begin
|
|
// Build actual image bits
|
|
if not IsJpegFrame then
|
|
NGFileLoader.LoadImageFromPNGFrame(FrameWidth, FrameHeight, IHDR, IDATMemory, Images[I]);
|
|
// Build palette, aply color key or background
|
|
NGFileLoader.ApplyFrameSettings(NGFileLoader.Frames[I], Images[I]);
|
|
Result := True;
|
|
end;
|
|
// Animate APNG images
|
|
if (NGFileLoader.FileType = ngAPNG) and FLoadAnimated then
|
|
TAPNGAnimator.Animate(Images, NGFileLoader.acTL, NGFileLoader.Frames);
|
|
end;
|
|
finally
|
|
NGFileLoader.Free;
|
|
end;
|
|
end;
|
|
|
|
function TPNGFileFormat.SaveData(Handle: TImagingHandle;
|
|
const Images: TDynImageDataArray; Index: LongInt): Boolean;
|
|
var
|
|
I: Integer;
|
|
ImageToSave: TImageData;
|
|
MustBeFreed: Boolean;
|
|
NGFileSaver: TNGFileSaver;
|
|
DefaultFormat: TImageFormat;
|
|
Screen: TImageData;
|
|
AnimWidth, AnimHeight: Integer;
|
|
begin
|
|
Result := False;
|
|
DefaultFormat := ifDefault;
|
|
AnimWidth := 0;
|
|
AnimHeight := 0;
|
|
NGFileSaver := TNGFileSaver.Create;
|
|
|
|
// Save images with more frames as APNG format
|
|
if Length(Images) > 1 then
|
|
begin
|
|
NGFileSaver.FileType := ngAPNG;
|
|
NGFileSaver.acTL.NumFrames := FLastIdx - FFirstIdx + 1;
|
|
NGFileSaver.acTL.NumPlay := 1;
|
|
SwapEndianLongWord(@NGFileSaver.acTL, SizeOf(NGFileSaver.acTL) div SizeOf(LongWord));
|
|
// Get max dimensions of frames
|
|
AnimWidth := Images[FFirstIdx].Width;
|
|
AnimHeight := Images[FFirstIdx].Height;
|
|
for I := FFirstIdx + 1 to FLastIdx do
|
|
begin
|
|
AnimWidth := Max(AnimWidth, Images[I].Width);
|
|
AnimHeight := Max(AnimHeight, Images[I].Height);
|
|
end;
|
|
end
|
|
else
|
|
NGFileSaver.FileType := ngPNG;
|
|
NGFileSaver.SetFileOptions(Self);
|
|
|
|
with NGFileSaver do
|
|
try
|
|
// Store all frames to be saved frames file saver
|
|
for I := FFirstIdx to FLastIdx do
|
|
begin
|
|
if MakeCompatible(Images[I], ImageToSave, MustBeFreed) then
|
|
try
|
|
if FileType = ngAPNG then
|
|
begin
|
|
// IHDR chunk is shared for all frames so all frames must have the
|
|
// same data format as the first image.
|
|
if I = FFirstIdx then
|
|
begin
|
|
DefaultFormat := ImageToSave.Format;
|
|
// Subsequenet frames may be bigger than the first one.
|
|
// APNG doens't support this - max allowed size is what's written in
|
|
// IHDR - size of main/default/first image. If some frame is
|
|
// bigger than the first one we need to resize (create empty bigger
|
|
// image and copy) the first frame so all following frames could fit to
|
|
// its area.
|
|
if (ImageToSave.Width <> AnimWidth) or (ImageToSave.Height <> AnimHeight) then
|
|
begin
|
|
InitImage(Screen);
|
|
NewImage(AnimWidth, AnimHeight, ImageToSave.Format, Screen);
|
|
CopyRect(ImageToSave, 0, 0, ImageToSave.Width, ImageToSave.Height, Screen, 0, 0);
|
|
if MustBeFreed then
|
|
FreeImage(ImageToSave);
|
|
ImageToSave := Screen;
|
|
end;
|
|
end
|
|
else if ImageToSave.Format <> DefaultFormat then
|
|
begin
|
|
if MustBeFreed then
|
|
ConvertImage(ImageToSave, DefaultFormat)
|
|
else
|
|
begin
|
|
CloneImage(Images[I], ImageToSave);
|
|
ConvertImage(ImageToSave, DefaultFormat);
|
|
MustBeFreed := True;
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
// Add image as PNG frame
|
|
AddFrame(ImageToSave, False);
|
|
finally
|
|
if MustBeFreed then
|
|
FreeImage(ImageToSave);
|
|
end
|
|
else
|
|
Exit;
|
|
end;
|
|
|
|
// Finally save PNG file
|
|
SaveFile(Handle);
|
|
Result := True;
|
|
finally
|
|
NGFileSaver.Free;
|
|
end;
|
|
end;
|
|
|
|
{$IFNDEF DONT_LINK_MNG}
|
|
|
|
{ TMNGFileFormat class implementation }
|
|
|
|
constructor TMNGFileFormat.Create;
|
|
begin
|
|
inherited Create;
|
|
FName := SMNGFormatName;
|
|
FIsMultiImageFormat := True;
|
|
AddMasks(SMNGMasks);
|
|
|
|
FSignature := MNGSignature;
|
|
|
|
RegisterOption(ImagingMNGLossyCompression, @FLossyCompression);
|
|
RegisterOption(ImagingMNGLossyAlpha, @FLossyAlpha);
|
|
RegisterOption(ImagingMNGPreFilter, @FPreFilter);
|
|
RegisterOption(ImagingMNGCompressLevel, @FCompressLevel);
|
|
RegisterOption(ImagingMNGQuality, @FQuality);
|
|
RegisterOption(ImagingMNGProgressive, @FProgressive);
|
|
end;
|
|
|
|
function TMNGFileFormat.LoadData(Handle: TImagingHandle;
|
|
var Images: TDynImageDataArray; OnlyFirstLevel: Boolean): Boolean;
|
|
var
|
|
NGFileLoader: TNGFileLoader;
|
|
I, Len: LongInt;
|
|
begin
|
|
Result := False;
|
|
NGFileLoader := TNGFileLoader.Create;
|
|
try
|
|
// Use NG file parser to load file
|
|
if NGFileLoader.LoadFile(Handle) then
|
|
begin
|
|
Len := Length(NGFileLoader.Frames);
|
|
if Len > 0 then
|
|
begin
|
|
SetLength(Images, Len);
|
|
for I := 0 to Len - 1 do
|
|
with NGFileLoader.Frames[I] do
|
|
begin
|
|
// Build actual image bits
|
|
if IsJpegFrame then
|
|
NGFileLoader.LoadImageFromJNGFrame(FrameWidth, FrameHeight, JHDR, IDATMemory, JDATMemory, JDAAMemory, Images[I])
|
|
else
|
|
NGFileLoader.LoadImageFromPNGFrame(FrameWidth, FrameHeight, IHDR, IDATMemory, Images[I]);
|
|
// Build palette, aply color key or background
|
|
NGFileLoader.ApplyFrameSettings(NGFileLoader.Frames[I], Images[I]);
|
|
end;
|
|
end
|
|
else
|
|
begin
|
|
// Some MNG files (with BASI-IEND streams) dont have actual pixel data
|
|
SetLength(Images, 1);
|
|
NewImage(NGFileLoader.MHDR.FrameWidth, NGFileLoader.MHDR.FrameWidth, ifDefault, Images[0]);
|
|
end;
|
|
Result := True;
|
|
end;
|
|
finally
|
|
NGFileLoader.Free;
|
|
end;
|
|
end;
|
|
|
|
function TMNGFileFormat.SaveData(Handle: TImagingHandle;
|
|
const Images: TDynImageDataArray; Index: LongInt): Boolean;
|
|
var
|
|
NGFileSaver: TNGFileSaver;
|
|
I, LargestWidth, LargestHeight: LongInt;
|
|
ImageToSave: TImageData;
|
|
MustBeFreed: Boolean;
|
|
begin
|
|
Result := False;
|
|
LargestWidth := 0;
|
|
LargestHeight := 0;
|
|
|
|
NGFileSaver := TNGFileSaver.Create;
|
|
NGFileSaver.FileType := ngMNG;
|
|
NGFileSaver.SetFileOptions(Self);
|
|
|
|
with NGFileSaver do
|
|
try
|
|
// Store all frames to be saved frames file saver
|
|
for I := FFirstIdx to FLastIdx do
|
|
begin
|
|
if MakeCompatible(Images[I], ImageToSave, MustBeFreed) then
|
|
try
|
|
// Add image as PNG or JNG frame
|
|
AddFrame(ImageToSave, FLossyCompression);
|
|
// Remember largest frame width and height
|
|
LargestWidth := Iff(LargestWidth < ImageToSave.Width, ImageToSave.Width, LargestWidth);
|
|
LargestHeight := Iff(LargestHeight < ImageToSave.Height, ImageToSave.Height, LargestHeight);
|
|
finally
|
|
if MustBeFreed then
|
|
FreeImage(ImageToSave);
|
|
end
|
|
else
|
|
Exit;
|
|
end;
|
|
|
|
// Fill MNG header
|
|
MHDR.FrameWidth := LargestWidth;
|
|
MHDR.FrameHeight := LargestHeight;
|
|
MHDR.TicksPerSecond := 0;
|
|
MHDR.NominalLayerCount := 0;
|
|
MHDR.NominalFrameCount := Length(Frames);
|
|
MHDR.NominalPlayTime := 0;
|
|
MHDR.SimplicityProfile := 473; // 111011001 binary, defines MNG-VLC with transparency and JNG support
|
|
|
|
// Finally save MNG file
|
|
SaveFile(Handle);
|
|
Result := True;
|
|
finally
|
|
NGFileSaver.Free;
|
|
end;
|
|
end;
|
|
|
|
{$ENDIF}
|
|
|
|
{$IFNDEF DONT_LINK_JNG}
|
|
|
|
{ TJNGFileFormat class implementation }
|
|
|
|
constructor TJNGFileFormat.Create;
|
|
begin
|
|
inherited Create;
|
|
FName := SJNGFormatName;
|
|
AddMasks(SJNGMasks);
|
|
|
|
FSignature := JNGSignature;
|
|
FLossyCompression := True;
|
|
|
|
RegisterOption(ImagingJNGLossyAlpha, @FLossyAlpha);
|
|
RegisterOption(ImagingJNGAlphaPreFilter, @FPreFilter);
|
|
RegisterOption(ImagingJNGAlphaCompressLevel, @FCompressLevel);
|
|
RegisterOption(ImagingJNGQuality, @FQuality);
|
|
RegisterOption(ImagingJNGProgressive, @FProgressive);
|
|
end;
|
|
|
|
function TJNGFileFormat.LoadData(Handle: TImagingHandle;
|
|
var Images: TDynImageDataArray; OnlyFirstLevel: Boolean): Boolean;
|
|
var
|
|
NGFileLoader: TNGFileLoader;
|
|
begin
|
|
Result := False;
|
|
NGFileLoader := TNGFileLoader.Create;
|
|
try
|
|
// Use NG file parser to load file
|
|
if NGFileLoader.LoadFile(Handle) and (Length(NGFileLoader.Frames) > 0) then
|
|
with NGFileLoader.Frames[0] do
|
|
begin
|
|
SetLength(Images, 1);
|
|
// Build actual image bits
|
|
if IsJpegFrame then
|
|
NGFileLoader.LoadImageFromJNGFrame(FrameWidth, FrameHeight, JHDR, IDATMemory, JDATMemory, JDAAMemory, Images[0]);
|
|
// Build palette, aply color key or background
|
|
NGFileLoader.ApplyFrameSettings(NGFileLoader.Frames[0], Images[0]);
|
|
Result := True;
|
|
end;
|
|
finally
|
|
NGFileLoader.Free;
|
|
end;
|
|
end;
|
|
|
|
function TJNGFileFormat.SaveData(Handle: TImagingHandle;
|
|
const Images: TDynImageDataArray; Index: LongInt): Boolean;
|
|
var
|
|
NGFileSaver: TNGFileSaver;
|
|
ImageToSave: TImageData;
|
|
MustBeFreed: Boolean;
|
|
begin
|
|
// Make image JNG compatible, store it in saver, and save it to file
|
|
Result := MakeCompatible(Images[Index], ImageToSave, MustBeFreed);
|
|
if Result then
|
|
begin
|
|
NGFileSaver := TNGFileSaver.Create;
|
|
with NGFileSaver do
|
|
try
|
|
FileType := ngJNG;
|
|
SetFileOptions(Self);
|
|
AddFrame(ImageToSave, True);
|
|
SaveFile(Handle);
|
|
finally
|
|
// Free NG saver and compatible image
|
|
NGFileSaver.Free;
|
|
if MustBeFreed then
|
|
FreeImage(ImageToSave);
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
{$ENDIF}
|
|
|
|
initialization
|
|
RegisterImageFileFormat(TPNGFileFormat);
|
|
{$IFNDEF DONT_LINK_MNG}
|
|
RegisterImageFileFormat(TMNGFileFormat);
|
|
{$ENDIF}
|
|
{$IFNDEF DONT_LINK_JNG}
|
|
RegisterImageFileFormat(TJNGFileFormat);
|
|
{$ENDIF}
|
|
finalization
|
|
|
|
{
|
|
File Notes:
|
|
|
|
-- TODOS ----------------------------------------------------
|
|
- nothing now
|
|
|
|
-- 0.26.3 Changes/Bug Fixes ---------------------------------
|
|
- Added APNG saving support.
|
|
- Added APNG support to NG loader and animating to PNG loader.
|
|
|
|
-- 0.26.1 Changes/Bug Fixes ---------------------------------
|
|
- Changed file format conditional compilation to reflect changes
|
|
in LINK symbols.
|
|
|
|
-- 0.24.3 Changes/Bug Fixes ---------------------------------
|
|
- Changes for better thread safety.
|
|
|
|
-- 0.23 Changes/Bug Fixes -----------------------------------
|
|
- Added loading of global palettes and transparencies in MNG files
|
|
(and by doing so fixed crash when loading images with global PLTE or tRNS).
|
|
|
|
-- 0.21 Changes/Bug Fixes -----------------------------------
|
|
- Small changes in converting to supported formats.
|
|
- MakeCompatible method moved to base class, put ConvertToSupported here.
|
|
GetSupportedFormats removed, it is now set in constructor.
|
|
- Made public properties for options registered to SetOption/GetOption
|
|
functions.
|
|
- Changed extensions to filename masks.
|
|
- Changed SaveData, LoadData, and MakeCompatible methods according
|
|
to changes in base class in Imaging unit.
|
|
|
|
-- 0.17 Changes/Bug Fixes -----------------------------------
|
|
- MNG and JNG support added, PNG support redesigned to support NG file handlers
|
|
- added classes for working with NG file formats
|
|
- stuff from old ImagingPng unit added and that unit was deleted
|
|
- unit created and initial stuff added
|
|
|
|
-- 0.15 Changes/Bug Fixes -----------------------------------
|
|
- when saving indexed images save alpha to tRNS?
|
|
- added some defines and ifdefs to dzlib unit to allow choosing
|
|
impaszlib, fpc's paszlib, zlibex or other zlib implementation
|
|
- added colorkeying support
|
|
- fixed 16bit channel image handling - pixels were not swapped
|
|
- fixed arithmetic overflow (in paeth filter) in FPC
|
|
- data of unknown chunks are skipped and not needlesly loaded
|
|
|
|
-- 0.13 Changes/Bug Fixes -----------------------------------
|
|
- adaptive filtering added to PNG saving
|
|
- TPNGFileFormat class added
|
|
}
|
|
|
|
end.
|