text: /*
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  %                                                                             %
  %                                                                             %
  %                                                                             %
  %                            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 1999-2018 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://www.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;
  
    register IndexPacket
      *indexes;
  
    register PixelPacket
      *q;
  
    register ssize_t
      i,
      x;
  
    size_t
      base,
      flag,
      offset,
      real,
      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;
    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 == TGAMonochrome) ||
        (tga_info.image_type == TGARLEColormap) ||
        (tga_info.image_type == TGARLEMonochrome))
      image->storage_class=PseudoClass;
    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 (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))
      {
        if (tga_info.attributes & (1UL << 5))
          SetImageArtifact(image,"tga:image-origin","TopRight");
        else
          SetImageArtifact(image,"tga:image-origin","BottomRight");
      }
    else
      {
        if (tga_info.attributes & (1UL << 5))
          SetImageArtifact(image,"tga:image-origin","TopLeft");
        else
          SetImageArtifact(image,"tga:image-origin","BottomLeft");
      }
    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;
    real=0;
    index=(IndexPacket) 0;
    runlength=0;
    offset=0;
    for (y=0; y < (ssize_t) image->rows; y++)
    {
      real=offset;
      if (((unsigned char) (tga_info.attributes & 0x20) >> 5) == 0)
        real=image->rows-real-1;
      q=QueueAuthenticPixels(image,0,(ssize_t) real,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,
                  1UL*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,((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->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->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->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->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;
  
    register const IndexPacket
      *indexes;
  
    register const PixelPacket
      *p;
  
    register ssize_t
      x;
  
    register ssize_t
      i;
  
    register unsigned char
      *q;
  
    ssize_t
      count,
      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;
        }
    value=GetImageArtifact(image,"tga:image-origin");
    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);
      }
    /*
      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.
    */
    for (y=(ssize_t) (image->rows-1); y >= 0; y--)
    {
      p=GetVirtualPixels(image,0,y,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 (image->previous == (Image *) NULL)
        {
          status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
            image->rows);
          if (status == MagickFalse)
            break;
        }
    }
    (void) CloseBlob(image);
    return(MagickTrue);
  }
  