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imagemagick/coders/tga.c

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Import Upstream version 6.9.11.60
2023-02-03 21:16:55 +08:00
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% TTTTT GGGG AAA %
% T G A A %
% T G GG AAAAA %
% T G G A A %
% T GGG A A %
% %
% %
% Read/Write Truevision Targa Image Format %
% %
% Software Design %
% Cristy %
% July 1992 %
% %
% %
% Copyright 1999-2021 ImageMagick Studio LLC, a non-profit organization %
% dedicated to making software imaging solutions freely available. %
% %
% You may not use this file except in compliance with the License. You may %
% obtain a copy of the License at %
% %
% https://imagemagick.org/script/license.php %
% %
% Unless required by applicable law or agreed to in writing, software %
% distributed under the License is distributed on an "AS IS" BASIS, %
% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. %
% See the License for the specific language governing permissions and %
% limitations under the License. %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%
*/
/*
Include declarations.
*/
#include "magick/studio.h"
#include "magick/artifact.h"
#include "magick/attribute.h"
#include "magick/blob.h"
#include "magick/blob-private.h"
#include "magick/cache.h"
#include "magick/color-private.h"
#include "magick/colormap.h"
#include "magick/colormap-private.h"
#include "magick/colorspace.h"
#include "magick/colorspace-private.h"
#include "magick/exception.h"
#include "magick/exception-private.h"
#include "magick/image.h"
#include "magick/image-private.h"
#include "magick/list.h"
#include "magick/magick.h"
#include "magick/memory_.h"
#include "magick/monitor.h"
#include "magick/monitor-private.h"
#include "magick/option.h"
#include "magick/pixel-accessor.h"
#include "magick/property.h"
#include "magick/quantum-private.h"
#include "magick/static.h"
#include "magick/string_.h"
#include "magick/module.h"
/*
Enumerated declaractions.
*/
typedef enum
{
TGAColormap = 1,
TGARGB = 2,
TGAMonochrome = 3,
TGARLEColormap = 9,
TGARLERGB = 10,
TGARLEMonochrome = 11
} TGAImageType;
/*
Typedef declaractions.
*/
typedef struct _TGAInfo
{
TGAImageType
image_type;
unsigned char
id_length,
colormap_type;
unsigned short
colormap_index,
colormap_length;
unsigned char
colormap_size;
unsigned short
x_origin,
y_origin,
width,
height;
unsigned char
bits_per_pixel,
attributes;
} TGAInfo;
/*
Forward declarations.
*/
static MagickBooleanType
WriteTGAImage(const ImageInfo *,Image *);
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% R e a d T G A I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% ReadTGAImage() reads a Truevision TGA image file and returns it.
% It allocates the memory necessary for the new Image structure and returns
% a pointer to the new image.
%
% The format of the ReadTGAImage method is:
%
% Image *ReadTGAImage(const ImageInfo *image_info,ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o image_info: the image info.
%
% o exception: return any errors or warnings in this structure.
%
*/
static Image *ReadTGAImage(const ImageInfo *image_info,ExceptionInfo *exception)
{
Image
*image;
IndexPacket
index;
MagickBooleanType
status;
PixelPacket
pixel;
IndexPacket
*indexes;
PixelPacket
*q;
ssize_t
i,
x;
size_t
base,
flag,
offset,
skip;
ssize_t
count,
y;
TGAInfo
tga_info;
unsigned char
j,
k,
pixels[4],
runlength;
unsigned int
alpha_bits;
/*
Open image file.
*/
assert(image_info != (const ImageInfo *) NULL);
assert(image_info->signature == MagickCoreSignature);
if (image_info->debug != MagickFalse)
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
image_info->filename);
assert(exception != (ExceptionInfo *) NULL);
assert(exception->signature == MagickCoreSignature);
image=AcquireImage(image_info);
status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
if (status == MagickFalse)
{
image=DestroyImageList(image);
return((Image *) NULL);
}
/*
Read TGA header information.
*/
count=ReadBlob(image,1,&tga_info.id_length);
tga_info.colormap_type=(unsigned char) ReadBlobByte(image);
tga_info.image_type=(TGAImageType) ReadBlobByte(image);
if ((count != 1) ||
((tga_info.image_type != TGAColormap) &&
(tga_info.image_type != TGARGB) &&
(tga_info.image_type != TGAMonochrome) &&
(tga_info.image_type != TGARLEColormap) &&
(tga_info.image_type != TGARLERGB) &&
(tga_info.image_type != TGARLEMonochrome)) ||
(((tga_info.image_type == TGAColormap) ||
(tga_info.image_type == TGARLEColormap)) &&
(tga_info.colormap_type == 0)))
ThrowReaderException(CorruptImageError,"ImproperImageHeader");
tga_info.colormap_index=ReadBlobLSBShort(image);
tga_info.colormap_length=ReadBlobLSBShort(image);
tga_info.colormap_size=(unsigned char) ReadBlobByte(image);
tga_info.x_origin=ReadBlobLSBShort(image);
tga_info.y_origin=ReadBlobLSBShort(image);
tga_info.width=(unsigned short) ReadBlobLSBShort(image);
tga_info.height=(unsigned short) ReadBlobLSBShort(image);
tga_info.bits_per_pixel=(unsigned char) ReadBlobByte(image);
tga_info.attributes=(unsigned char) ReadBlobByte(image);
if (EOFBlob(image) != MagickFalse)
ThrowReaderException(CorruptImageError,"UnableToReadImageData");
if ((((tga_info.bits_per_pixel <= 1) || (tga_info.bits_per_pixel >= 17)) &&
(tga_info.bits_per_pixel != 24) && (tga_info.bits_per_pixel != 32)))
ThrowReaderException(CorruptImageError,"ImproperImageHeader");
/*
Initialize image structure.
*/
image->columns=tga_info.width;
image->rows=tga_info.height;
if ((tga_info.image_type != TGAMonochrome) &&
(tga_info.image_type != TGARLEMonochrome))
{
alpha_bits=(tga_info.attributes & 0x0FU);
image->matte=(alpha_bits > 0) || (tga_info.bits_per_pixel == 32) ||
(tga_info.colormap_size == 32) ? MagickTrue : MagickFalse;
}
if ((tga_info.image_type != TGAColormap) &&
(tga_info.image_type != TGARLEColormap))
image->depth=(size_t) ((tga_info.bits_per_pixel <= 8) ? 8 :
(tga_info.bits_per_pixel <= 16) ? 5 : 8);
else
image->depth=(size_t) ((tga_info.colormap_size <= 8) ? 8 :
(tga_info.colormap_size <= 16) ? 5 : 8);
if ((tga_info.image_type == TGAColormap) ||
(tga_info.image_type == TGARLEColormap))
image->storage_class=PseudoClass;
if ((tga_info.image_type == TGAMonochrome) ||
(tga_info.image_type == TGARLEMonochrome))
{
image->type=GrayscaleType;
image->colorspace=GRAYColorspace;
}
image->compression=NoCompression;
if ((tga_info.image_type == TGARLEColormap) ||
(tga_info.image_type == TGARLEMonochrome) ||
(tga_info.image_type == TGARLERGB))
image->compression=RLECompression;
if (image->storage_class == PseudoClass)
{
if (tga_info.colormap_type != 0)
image->colors=tga_info.colormap_index+tga_info.colormap_length;
else
{
size_t
one;
one=1;
image->colors=one << tga_info.bits_per_pixel;
if ((MagickSizeType) image->colors > GetBlobSize(image))
ThrowReaderException(CorruptImageError,
"InsufficientImageDataInFile");
if (AcquireImageColormap(image,image->colors) == MagickFalse)
ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
}
}
if (tga_info.id_length != 0)
{
char
*comment;
size_t
length;
/*
TGA image comment.
*/
length=(size_t) tga_info.id_length;
comment=(char *) NULL;
if (~length >= (MaxTextExtent-1))
comment=(char *) AcquireQuantumMemory(length+MaxTextExtent,
sizeof(*comment));
if (comment == (char *) NULL)
ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
count=ReadBlob(image,length,(unsigned char *) comment);
if (count == (ssize_t) length)
{
comment[length]='\0';
(void) SetImageProperty(image,"comment",comment);
}
comment=DestroyString(comment);
}
if ((tga_info.attributes & (1UL << 4)) == 0)
{
if ((tga_info.attributes & (1UL << 5)) == 0)
image->orientation=BottomLeftOrientation;
else
image->orientation=TopLeftOrientation;
}
else
{
if ((tga_info.attributes & (1UL << 5)) == 0)
image->orientation=BottomRightOrientation;
else
image->orientation=TopRightOrientation;
}
if (image_info->ping != MagickFalse)
{
(void) CloseBlob(image);
return(image);
}
status=SetImageExtent(image,image->columns,image->rows);
if (status == MagickFalse)
{
InheritException(exception,&image->exception);
return(DestroyImageList(image));
}
(void) memset(&pixel,0,sizeof(pixel));
pixel.opacity=(Quantum) OpaqueOpacity;
if (tga_info.colormap_type != 0)
{
/*
Read TGA raster colormap.
*/
if (image->colors < tga_info.colormap_index)
image->colors=tga_info.colormap_index;
if (AcquireImageColormap(image,image->colors) == MagickFalse)
ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
for (i=0; i < (ssize_t) tga_info.colormap_index; i++)
image->colormap[i]=pixel;
for ( ; i < (ssize_t) image->colors; i++)
{
switch (tga_info.colormap_size)
{
case 8:
default:
{
/*
Gray scale.
*/
pixel.red=ScaleCharToQuantum((unsigned char) ReadBlobByte(image));
pixel.green=pixel.red;
pixel.blue=pixel.red;
break;
}
case 15:
case 16:
{
QuantumAny
range;
/*
5 bits each of red green and blue.
*/
j=(unsigned char) ReadBlobByte(image);
k=(unsigned char) ReadBlobByte(image);
range=GetQuantumRange(5UL);
pixel.red=ScaleAnyToQuantum(1UL*(k & 0x7c) >> 2,range);
pixel.green=ScaleAnyToQuantum((1UL*(k & 0x03) << 3)+
(1UL*(j & 0xe0) >> 5),range);
pixel.blue=ScaleAnyToQuantum(1UL*(j & 0x1f),range);
break;
}
case 24:
{
/*
8 bits each of blue, green and red.
*/
pixel.blue=ScaleCharToQuantum((unsigned char) ReadBlobByte(image));
pixel.green=ScaleCharToQuantum((unsigned char) ReadBlobByte(image));
pixel.red=ScaleCharToQuantum((unsigned char) ReadBlobByte(image));
break;
}
case 32:
{
/*
8 bits each of blue, green, red, and alpha.
*/
pixel.blue=ScaleCharToQuantum((unsigned char) ReadBlobByte(image));
pixel.green=ScaleCharToQuantum((unsigned char) ReadBlobByte(image));
pixel.red=ScaleCharToQuantum((unsigned char) ReadBlobByte(image));
pixel.opacity=(Quantum) (QuantumRange-ScaleCharToQuantum(
(unsigned char) ReadBlobByte(image)));
break;
}
}
image->colormap[i]=pixel;
}
}
/*
Convert TGA pixels to pixel packets.
*/
base=0;
flag=0;
skip=MagickFalse;
index=(IndexPacket) 0;
runlength=0;
offset=0;
for (y=0; y < (ssize_t) image->rows; y++)
{
q=QueueAuthenticPixels(image,0,offset,image->columns,1,exception);
if (q == (PixelPacket *) NULL)
break;
indexes=GetAuthenticIndexQueue(image);
for (x=0; x < (ssize_t) image->columns; x++)
{
if ((tga_info.image_type == TGARLEColormap) ||
(tga_info.image_type == TGARLERGB) ||
(tga_info.image_type == TGARLEMonochrome))
{
if (runlength != 0)
{
runlength--;
skip=flag != 0;
}
else
{
count=ReadBlob(image,1,&runlength);
if (count != 1)
ThrowReaderException(CorruptImageError,"UnableToReadImageData");
flag=runlength & 0x80;
if (flag != 0)
runlength-=128;
skip=MagickFalse;
}
}
if (skip == MagickFalse)
switch (tga_info.bits_per_pixel)
{
case 8:
default:
{
/*
Gray scale.
*/
if (ReadBlob(image,1,pixels) != 1)
ThrowReaderException(CorruptImageError,"UnableToReadImageData");
index=(Quantum) pixels[0];
if (tga_info.colormap_type != 0)
pixel=image->colormap[(ssize_t) ConstrainColormapIndex(image,
(ssize_t) index)];
else
{
pixel.red=ScaleCharToQuantum((unsigned char) index);
pixel.green=ScaleCharToQuantum((unsigned char) index);
pixel.blue=ScaleCharToQuantum((unsigned char) index);
}
break;
}
case 15:
case 16:
{
QuantumAny
range;
/*
5 bits each of RGB;
*/
if (ReadBlob(image,2,pixels) != 2)
ThrowReaderException(CorruptImageError,"UnableToReadImageData");
j=pixels[0];
k=pixels[1];
range=GetQuantumRange(5UL);
pixel.red=ScaleAnyToQuantum(1UL*(k & 0x7c) >> 2,range);
pixel.green=ScaleAnyToQuantum((1UL*(k & 0x03) << 3)+
(1UL*(j & 0xe0) >> 5),range);
pixel.blue=ScaleAnyToQuantum(1UL*(j & 0x1f),range);
if (image->matte != MagickFalse)
pixel.opacity=(k & 0x80) == 0 ? (Quantum) TransparentOpacity :
(Quantum) OpaqueOpacity;
if (image->storage_class == PseudoClass)
index=ConstrainColormapIndex(image,(ssize_t) ((size_t) k << 8)+j);
break;
}
case 24:
{
/*
BGR pixels.
*/
if (ReadBlob(image,3,pixels) != 3)
ThrowReaderException(CorruptImageError,"UnableToReadImageData");
pixel.blue=ScaleCharToQuantum(pixels[0]);
pixel.green=ScaleCharToQuantum(pixels[1]);
pixel.red=ScaleCharToQuantum(pixels[2]);
break;
}
case 32:
{
/*
BGRA pixels.
*/
if (ReadBlob(image,4,pixels) != 4)
ThrowReaderException(CorruptImageError,"UnableToReadImageData");
pixel.blue=ScaleCharToQuantum(pixels[0]);
pixel.green=ScaleCharToQuantum(pixels[1]);
pixel.red=ScaleCharToQuantum(pixels[2]);
pixel.opacity=(Quantum) (QuantumRange-ScaleCharToQuantum(
pixels[3]));
break;
}
}
if (status == MagickFalse)
ThrowReaderException(CorruptImageError,"UnableToReadImageData");
if (image->storage_class == PseudoClass)
SetPixelIndex(indexes+x,index);
SetPixelRed(q,pixel.red);
SetPixelGreen(q,pixel.green);
SetPixelBlue(q,pixel.blue);
if (image->matte != MagickFalse)
SetPixelOpacity(q,pixel.opacity);
q++;
}
/*
if (((unsigned char) (tga_info.attributes & 0xc0) >> 6) == 4)
offset+=4;
else
*/
if (((unsigned char) (tga_info.attributes & 0xc0) >> 6) == 2)
offset+=2;
else
offset++;
if (offset >= image->rows)
{
base++;
offset=base;
}
if (SyncAuthenticPixels(image,exception) == MagickFalse)
break;
if (image->previous == (Image *) NULL)
{
status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
image->rows);
if (status == MagickFalse)
break;
}
}
if (EOFBlob(image) != MagickFalse)
ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
image->filename);
(void) CloseBlob(image);
return(GetFirstImageInList(image));
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% R e g i s t e r T G A I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% RegisterTGAImage() adds properties for the TGA image format to
% the list of supported formats. The properties include the image format
% tag, a method to read and/or write the format, whether the format
% supports the saving of more than one frame to the same file or blob,
% whether the format supports native in-memory I/O, and a brief
% description of the format.
%
% The format of the RegisterTGAImage method is:
%
% size_t RegisterTGAImage(void)
%
*/
ModuleExport size_t RegisterTGAImage(void)
{
MagickInfo
*entry;
entry=SetMagickInfo("ICB");
entry->decoder=(DecodeImageHandler *) ReadTGAImage;
entry->encoder=(EncodeImageHandler *) WriteTGAImage;
entry->adjoin=MagickFalse;
entry->description=ConstantString("Truevision Targa image");
entry->magick_module=ConstantString("TGA");
entry->seekable_stream=MagickTrue;
(void) RegisterMagickInfo(entry);
entry=SetMagickInfo("TGA");
entry->decoder=(DecodeImageHandler *) ReadTGAImage;
entry->encoder=(EncodeImageHandler *) WriteTGAImage;
entry->adjoin=MagickFalse;
entry->description=ConstantString("Truevision Targa image");
entry->magick_module=ConstantString("TGA");
entry->seekable_stream=MagickTrue;
(void) RegisterMagickInfo(entry);
entry=SetMagickInfo("VDA");
entry->decoder=(DecodeImageHandler *) ReadTGAImage;
entry->encoder=(EncodeImageHandler *) WriteTGAImage;
entry->adjoin=MagickFalse;
entry->description=ConstantString("Truevision Targa image");
entry->magick_module=ConstantString("TGA");
entry->seekable_stream=MagickTrue;
(void) RegisterMagickInfo(entry);
entry=SetMagickInfo("VST");
entry->decoder=(DecodeImageHandler *) ReadTGAImage;
entry->encoder=(EncodeImageHandler *) WriteTGAImage;
entry->adjoin=MagickFalse;
entry->description=ConstantString("Truevision Targa image");
entry->magick_module=ConstantString("TGA");
entry->seekable_stream=MagickTrue;
(void) RegisterMagickInfo(entry);
return(MagickImageCoderSignature);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% U n r e g i s t e r T G A I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% UnregisterTGAImage() removes format registrations made by the
% TGA module from the list of supported formats.
%
% The format of the UnregisterTGAImage method is:
%
% UnregisterTGAImage(void)
%
*/
ModuleExport void UnregisterTGAImage(void)
{
(void) UnregisterMagickInfo("ICB");
(void) UnregisterMagickInfo("TGA");
(void) UnregisterMagickInfo("VDA");
(void) UnregisterMagickInfo("VST");
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% W r i t e T G A I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% WriteTGAImage() writes a image in the Truevision Targa rasterfile
% format.
%
% The format of the WriteTGAImage method is:
%
% MagickBooleanType WriteTGAImage(const ImageInfo *image_info,Image *image)
%
% A description of each parameter follows.
%
% o image_info: the image info.
%
% o image: The image.
%
*/
static inline void WriteTGAPixel(Image *image,TGAImageType image_type,
const IndexPacket *indexes,const PixelPacket *p,const QuantumAny range,
const double midpoint)
{
if (image_type == TGAColormap || image_type == TGARLEColormap)
(void) WriteBlobByte(image,(unsigned char) GetPixelIndex(indexes));
else
{
if (image_type == TGAMonochrome || image_type == TGARLEMonochrome)
(void) WriteBlobByte(image,ScaleQuantumToChar(ClampToQuantum(
GetPixelLuma(image,p))));
else
if (image->depth == 5)
{
unsigned char
green,
value;
green=(unsigned char) ScaleQuantumToAny(GetPixelGreen(p),range);
value=((unsigned char) ScaleQuantumToAny(GetPixelBlue(p),range)) |
((green & 0x07) << 5);
(void) WriteBlobByte(image,value);
value=(unsigned char) ((((image->matte != MagickFalse) &&
((double) GetPixelOpacity(p) < midpoint)) ? 0x80 : 0) |
((unsigned char) ScaleQuantumToAny(GetPixelRed(p),range) << 2) |
((green & 0x18) >> 3));
(void) WriteBlobByte(image,value);
}
else
{
(void) WriteBlobByte(image,ScaleQuantumToChar(GetPixelBlue(p)));
(void) WriteBlobByte(image,ScaleQuantumToChar(GetPixelGreen(p)));
(void) WriteBlobByte(image,ScaleQuantumToChar(GetPixelRed(p)));
if (image->matte != MagickFalse)
(void) WriteBlobByte(image,ScaleQuantumToChar(GetPixelAlpha(p)));
}
}
}
static MagickBooleanType WriteTGAImage(const ImageInfo *image_info,Image *image)
{
CompressionType
compression;
const char
*comment,
*value;
const double
midpoint = QuantumRange/2.0;
MagickBooleanType
status;
QuantumAny
range;
const IndexPacket
*indexes;
const PixelPacket
*p;
ssize_t
x;
ssize_t
i;
unsigned char
*q;
ssize_t
base,
count,
offset,
y;
TGAInfo
tga_info;
/*
Open output image file.
*/
assert(image_info != (const ImageInfo *) NULL);
assert(image_info->signature == MagickCoreSignature);
assert(image != (Image *) NULL);
assert(image->signature == MagickCoreSignature);
if (image->debug != MagickFalse)
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
status=OpenBlob(image_info,image,WriteBinaryBlobMode,&image->exception);
if (status == MagickFalse)
return(status);
/*
Initialize TGA raster file header.
*/
if ((image->columns > 65535L) || (image->rows > 65535L))
ThrowWriterException(ImageError,"WidthOrHeightExceedsLimit");
(void) TransformImageColorspace(image,sRGBColorspace);
compression=image->compression;
if (image_info->compression != UndefinedCompression)
compression=image_info->compression;
range=GetQuantumRange(5UL);
tga_info.id_length=0;
comment=GetImageProperty(image,"comment");
if (comment != (const char *) NULL)
tga_info.id_length=(unsigned char) MagickMin(strlen(comment),255);
tga_info.colormap_type=0;
tga_info.colormap_index=0;
tga_info.colormap_length=0;
tga_info.colormap_size=0;
tga_info.x_origin=0;
tga_info.y_origin=0;
tga_info.width=(unsigned short) image->columns;
tga_info.height=(unsigned short) image->rows;
tga_info.bits_per_pixel=8;
tga_info.attributes=0;
if ((image_info->type != TrueColorType) &&
(image_info->type != TrueColorMatteType) &&
(image_info->type != PaletteType) &&
(image->matte == MagickFalse) &&
(SetImageGray(image,&image->exception) != MagickFalse))
tga_info.image_type=compression == RLECompression ? TGARLEMonochrome :
TGAMonochrome;
else
if ((image->storage_class == DirectClass) || (image->colors > 256))
{
/*
Full color TGA raster.
*/
tga_info.image_type=compression == RLECompression ? TGARLERGB : TGARGB;
if (image_info->depth == 5)
{
tga_info.bits_per_pixel=16;
if (image->matte != MagickFalse)
tga_info.attributes=1; /* # of alpha bits */
}
else
{
tga_info.bits_per_pixel=24;
if (image->matte != MagickFalse)
{
tga_info.bits_per_pixel=32;
tga_info.attributes=8; /* # of alpha bits */
}
}
}
else
{
/*
Colormapped TGA raster.
*/
tga_info.image_type=compression == RLECompression ? TGARLEColormap :
TGAColormap;
tga_info.colormap_type=1;
tga_info.colormap_length=(unsigned short) image->colors;
if (image_info->depth == 5)
tga_info.colormap_size=16;
else
tga_info.colormap_size=24;
}
if ((image->orientation == BottomRightOrientation) ||
(image->orientation == TopRightOrientation))
tga_info.attributes|=(1UL << 4);
if ((image->orientation == TopLeftOrientation) ||
(image->orientation == TopRightOrientation))
tga_info.attributes|=(1UL << 5);
value=GetImageArtifact(image,"tga:image-origin"); /* deprecated */
if (value != (const char *) NULL)
{
OrientationType
origin;
origin=(OrientationType) ParseCommandOption(MagickOrientationOptions,
MagickFalse,value);
if (origin == BottomRightOrientation || origin == TopRightOrientation)
tga_info.attributes|=(1UL << 4);
if (origin == TopLeftOrientation || origin == TopRightOrientation)
tga_info.attributes|=(1UL << 5);
}
if ((image->columns > 65535) || (image->rows > 65535))
ThrowWriterException(ImageError,"WidthOrHeightExceedsLimit");
/*
Write TGA header.
*/
(void) WriteBlobByte(image,tga_info.id_length);
(void) WriteBlobByte(image,tga_info.colormap_type);
(void) WriteBlobByte(image,(unsigned char) tga_info.image_type);
(void) WriteBlobLSBShort(image,tga_info.colormap_index);
(void) WriteBlobLSBShort(image,tga_info.colormap_length);
(void) WriteBlobByte(image,tga_info.colormap_size);
(void) WriteBlobLSBShort(image,tga_info.x_origin);
(void) WriteBlobLSBShort(image,tga_info.y_origin);
(void) WriteBlobLSBShort(image,tga_info.width);
(void) WriteBlobLSBShort(image,tga_info.height);
(void) WriteBlobByte(image,tga_info.bits_per_pixel);
(void) WriteBlobByte(image,tga_info.attributes);
if (tga_info.id_length != 0)
(void) WriteBlob(image,tga_info.id_length,(unsigned char *) comment);
if (tga_info.colormap_type != 0)
{
unsigned char
green,
*targa_colormap;
/*
Dump colormap to file (blue, green, red byte order).
*/
targa_colormap=(unsigned char *) AcquireQuantumMemory((size_t)
tga_info.colormap_length,(tga_info.colormap_size/8)*sizeof(
*targa_colormap));
if (targa_colormap == (unsigned char *) NULL)
ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
q=targa_colormap;
for (i=0; i < (ssize_t) image->colors; i++)
{
if (image_info->depth == 5)
{
green=(unsigned char) ScaleQuantumToAny(image->colormap[i].green,
range);
*q++=((unsigned char) ScaleQuantumToAny(image->colormap[i].blue,
range)) | ((green & 0x07) << 5);
*q++=(((image->matte != MagickFalse) && (
(double) image->colormap[i].opacity < midpoint)) ? 0x80 : 0) |
((unsigned char) ScaleQuantumToAny(image->colormap[i].red,
range) << 2) | ((green & 0x18) >> 3);
}
else
{
*q++=ScaleQuantumToChar(image->colormap[i].blue);
*q++=ScaleQuantumToChar(image->colormap[i].green);
*q++=ScaleQuantumToChar(image->colormap[i].red);
}
}
(void) WriteBlob(image,(size_t) ((tga_info.colormap_size/8)*
tga_info.colormap_length),targa_colormap);
targa_colormap=(unsigned char *) RelinquishMagickMemory(targa_colormap);
}
/*
Convert MIFF to TGA raster pixels.
*/
base=0;
offset=0;
for (y=0; y < (ssize_t) image->rows; y++)
{
p=GetVirtualPixels(image,0,offset,image->columns,1,&image->exception);
if (p == (const PixelPacket *) NULL)
break;
indexes=GetVirtualIndexQueue(image);
if (compression == RLECompression)
{
x=0;
count=0;
while (x < (ssize_t) image->columns)
{
i=1;
while ((i < 128) && (count + i < 128) &&
((x + i) < (ssize_t) image->columns))
{
if (tga_info.image_type == TGARLEColormap)
{
if (GetPixelIndex(indexes+i) != GetPixelIndex(indexes+(i-1)))
break;
}
else
if (tga_info.image_type == TGARLEMonochrome)
{
if (GetPixelLuma(image,p+i) != GetPixelLuma(image,p+(i-1)))
break;
}
else
{
if ((GetPixelBlue(p+i) != GetPixelBlue(p+(i-1))) ||
(GetPixelGreen(p+i) != GetPixelGreen(p+(i-1))) ||
(GetPixelRed(p+i) != GetPixelRed(p+(i-1))))
break;
if ((image->matte != MagickFalse) &&
(GetPixelAlpha(p+i) != GetPixelAlpha(p+(i-1))))
break;
}
i++;
}
if (i < 3)
{
count+=i;
p+=i;
indexes+=i;
}
if ((i >= 3) || (count == 128) ||
((x + i) == (ssize_t) image->columns))
{
if (count > 0)
{
(void) WriteBlobByte(image,(unsigned char) (--count));
while (count >= 0)
{
WriteTGAPixel(image,tga_info.image_type,indexes-(count+1),
p-(count+1),range,midpoint);
count--;
}
count=0;
}
}
if (i >= 3)
{
(void) WriteBlobByte(image,(unsigned char) ((i-1) | 0x80));
WriteTGAPixel(image,tga_info.image_type,indexes,p,range,midpoint);
p+=i;
indexes+=i;
}
x+=i;
}
}
else
for (x=0; x < (ssize_t) image->columns; x++)
WriteTGAPixel(image,tga_info.image_type,indexes+x,p++,range,midpoint);
if (((unsigned char) (tga_info.attributes & 0xc0) >> 6) == 2)
offset+=2;
else
offset++;
if (offset >= (ssize_t) image->rows)
{
base++;
offset=base;
}
if (image->previous == (Image *) NULL)
{
status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
image->rows);
if (status == MagickFalse)
break;
}
}
(void) CloseBlob(image);
return(MagickTrue);
}