granicus.if.org Git - imagemagick/blob - coders/tga.c

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %                            TTTTT   GGGG   AAA                               %
   7 %                              T    G      A   A                              %
   8 %                              T    G  GG  AAAAA                              %
   9 %                              T    G   G  A   A                              %
  10 %                              T     GGG   A   A                              %
  11 %                                                                             %
  12 %                                                                             %
  13 %                    Read/Write Truevision Targa Image Format                 %
  14 %                                                                             %
  15 %                              Software Design                                %
  16 %                                   Cristy                                    %
  17 %                                 July 1992                                   %
  18 %                                                                             %
  19 %                                                                             %
  20 %  Copyright 1999-2014 ImageMagick Studio LLC, a non-profit organization      %
  21 %  dedicated to making software imaging solutions freely available.           %
  22 %                                                                             %
  23 %  You may not use this file except in compliance with the License.  You may  %
  24 %  obtain a copy of the License at                                            %
  25 %                                                                             %
  26 %    http://www.imagemagick.org/script/license.php                            %
  27 %                                                                             %
  28 %  Unless required by applicable law or agreed to in writing, software        %
  29 %  distributed under the License is distributed on an "AS IS" BASIS,          %
  30 %  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   %
  31 %  See the License for the specific language governing permissions and        %
  32 %  limitations under the License.                                             %
  33 %                                                                             %
  34 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  35 %
  36 %
  37 */
  38 \f
  39 /*
  40   Include declarations.
  41 */
  42 #include "MagickCore/studio.h"
  43 #include "MagickCore/attribute.h"
  44 #include "MagickCore/blob.h"
  45 #include "MagickCore/blob-private.h"
  46 #include "MagickCore/cache.h"
  47 #include "MagickCore/color-private.h"
  48 #include "MagickCore/colormap.h"
  49 #include "MagickCore/colormap-private.h"
  50 #include "MagickCore/colorspace.h"
  51 #include "MagickCore/colorspace-private.h"
  52 #include "MagickCore/exception.h"
  53 #include "MagickCore/exception-private.h"
  54 #include "MagickCore/image.h"
  55 #include "MagickCore/image-private.h"
  56 #include "MagickCore/list.h"
  57 #include "MagickCore/magick.h"
  58 #include "MagickCore/memory_.h"
  59 #include "MagickCore/monitor.h"
  60 #include "MagickCore/monitor-private.h"
  61 #include "MagickCore/pixel-accessor.h"
  62 #include "MagickCore/property.h"
  63 #include "MagickCore/quantum-private.h"
  64 #include "MagickCore/static.h"
  65 #include "MagickCore/string_.h"
  66 #include "MagickCore/module.h"
  67
  68 /*
  69   Enumerated declaractions.
  70 */
  71 typedef enum
  72 {
  73   TGAColormap = 1,
  74   TGARGB = 2,
  75   TGAMonochrome = 3,
  76   TGARLEColormap = 9,
  77   TGARLERGB = 10,
  78   TGARLEMonochrome = 11
  79 } TGAImageType;
  80
  81 /*
  82   Typedef declaractions.
  83 */
  84 typedef struct _TGAInfo
  85 {
  86   TGAImageType
  87     image_type;
  88
  89   unsigned char
  90     id_length,
  91     colormap_type;
  92
  93   unsigned short
  94     colormap_index,
  95     colormap_length;
  96
  97   unsigned char
  98     colormap_size;
  99
 100   unsigned short
 101     x_origin,
 102     y_origin,
 103     width,
 104     height;
 105
 106   unsigned char
 107     bits_per_pixel,
 108     attributes;
 109 } TGAInfo;
 110 \f
 111 /*
 112   Forward declarations.
 113 */
 114 static MagickBooleanType
 115   WriteTGAImage(const ImageInfo *,Image *,ExceptionInfo *);
 116 \f
 117 /*
 118 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 119 %                                                                             %
 120 %                                                                             %
 121 %                                                                             %
 122 %   R e a d T G A I m a g e                                                   %
 123 %                                                                             %
 124 %                                                                             %
 125 %                                                                             %
 126 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 127 %
 128 %  ReadTGAImage() reads a Truevision TGA image file and returns it.
 129 %  It allocates the memory necessary for the new Image structure and returns
 130 %  a pointer to the new image.
 131 %
 132 %  The format of the ReadTGAImage method is:
 133 %
 134 %      Image *ReadTGAImage(const ImageInfo *image_info,ExceptionInfo *exception)
 135 %
 136 %  A description of each parameter follows:
 137 %
 138 %    o image_info: the image info.
 139 %
 140 %    o exception: return any errors or warnings in this structure.
 141 %
 142 */
 143 static Image *ReadTGAImage(const ImageInfo *image_info,
 144   ExceptionInfo *exception)
 145 {
 146   Image
 147     *image;
 148
 149   MagickBooleanType
 150     status;
 151
 152   PixelInfo
 153     pixel;
 154
 155   Quantum
 156     index;
 157
 158   register Quantum
 159     *q;
 160
 161   register ssize_t
 162     i,
 163     x;
 164
 165   size_t
 166     base,
 167     flag,
 168     offset,
 169     real,
 170     skip;
 171
 172   ssize_t
 173     count,
 174     y;
 175
 176   TGAInfo
 177     tga_info;
 178
 179   unsigned char
 180     j,
 181     k,
 182     pixels[4],
 183     runlength;
 184
 185   unsigned int
 186     alpha_bits;
 187
 188   /*
 189     Open image file.
 190   */
 191   assert(image_info != (const ImageInfo *) NULL);
 192   assert(image_info->signature == MagickSignature);
 193   if (image_info->debug != MagickFalse)
 194     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 195       image_info->filename);
 196   assert(exception != (ExceptionInfo *) NULL);
 197   assert(exception->signature == MagickSignature);
 198   image=AcquireImage(image_info,exception);
 199   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 200   if (status == MagickFalse)
 201     {
 202       image=DestroyImageList(image);
 203       return((Image *) NULL);
 204     }
 205   /*
 206     Read TGA header information.
 207   */
 208   count=ReadBlob(image,1,&tga_info.id_length);
 209   tga_info.colormap_type=(unsigned char) ReadBlobByte(image);
 210   tga_info.image_type=(TGAImageType) ReadBlobByte(image);
 211   if ((count != 1) ||
 212       ((tga_info.image_type != TGAColormap) &&
 213        (tga_info.image_type != TGARGB) &&
 214        (tga_info.image_type != TGAMonochrome) &&
 215        (tga_info.image_type != TGARLEColormap) &&
 216        (tga_info.image_type != TGARLERGB) &&
 217        (tga_info.image_type != TGARLEMonochrome)) ||
 218       (((tga_info.image_type == TGAColormap) ||
 219        (tga_info.image_type == TGARLEColormap)) &&
 220        (tga_info.colormap_type == 0)))
 221     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 222   tga_info.colormap_index=ReadBlobLSBShort(image);
 223   tga_info.colormap_length=ReadBlobLSBShort(image);
 224   tga_info.colormap_size=(unsigned char) ReadBlobByte(image);
 225   tga_info.x_origin=ReadBlobLSBShort(image);
 226   tga_info.y_origin=ReadBlobLSBShort(image);
 227   tga_info.width=(unsigned short) ReadBlobLSBShort(image);
 228   tga_info.height=(unsigned short) ReadBlobLSBShort(image);
 229   tga_info.bits_per_pixel=(unsigned char) ReadBlobByte(image);
 230   tga_info.attributes=(unsigned char) ReadBlobByte(image);
 231   if (EOFBlob(image) != MagickFalse)
 232     ThrowReaderException(CorruptImageError,"UnableToReadImageData");
 233   if ((((tga_info.bits_per_pixel <= 1) || (tga_info.bits_per_pixel >= 17)) &&
 234        (tga_info.bits_per_pixel != 24) && (tga_info.bits_per_pixel != 32)))
 235     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 236   /*
 237     Initialize image structure.
 238   */
 239   image->columns=tga_info.width;
 240   image->rows=tga_info.height;
 241   alpha_bits=(tga_info.attributes & 0x0FU);
 242   image->alpha_trait=(alpha_bits > 0) || (tga_info.bits_per_pixel == 32) ||
 243     (tga_info.colormap_size == 32) ?  BlendPixelTrait : UndefinedPixelTrait;
 244   if ((tga_info.image_type != TGAColormap) &&
 245       (tga_info.image_type != TGARLEColormap))
 246     image->depth=(size_t) ((tga_info.bits_per_pixel <= 8) ? 8 :
 247       (tga_info.bits_per_pixel <= 16) ? 5 :
 248       (tga_info.bits_per_pixel == 24) ? 8 :
 249       (tga_info.bits_per_pixel == 32) ? 8 : 8);
 250   else
 251     image->depth=(size_t) ((tga_info.colormap_size <= 8) ? 8 :
 252       (tga_info.colormap_size <= 16) ? 5 :
 253       (tga_info.colormap_size == 24) ? 8 :
 254       (tga_info.colormap_size == 32) ? 8 : 8);
 255   if ((tga_info.image_type == TGAColormap) ||
 256       (tga_info.image_type == TGAMonochrome) ||
 257       (tga_info.image_type == TGARLEColormap) ||
 258       (tga_info.image_type == TGARLEMonochrome))
 259     image->storage_class=PseudoClass;
 260   image->compression=NoCompression;
 261   if ((tga_info.image_type == TGARLEColormap) ||
 262       (tga_info.image_type == TGARLEMonochrome))
 263     image->compression=RLECompression;
 264   if (image->storage_class == PseudoClass)
 265     {
 266       if (tga_info.colormap_type != 0)
 267         image->colors=tga_info.colormap_length;
 268       else
 269         {
 270           size_t
 271             one;
 272
 273           one=1;
 274           image->colors=one << tga_info.bits_per_pixel;
 275           if (AcquireImageColormap(image,image->colors,exception) == MagickFalse)
 276             ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 277         }
 278     }
 279   if (tga_info.id_length != 0)
 280     {
 281       char
 282         *comment;
 283
 284       size_t
 285         length;
 286
 287       /*
 288         TGA image comment.
 289       */
 290       length=(size_t) tga_info.id_length;
 291       comment=(char *) NULL;
 292       if (~length >= (MaxTextExtent-1))
 293         comment=(char *) AcquireQuantumMemory(length+MaxTextExtent,
 294           sizeof(*comment));
 295       if (comment == (char *) NULL)
 296         ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 297       count=ReadBlob(image,tga_info.id_length,(unsigned char *) comment);
 298       comment[tga_info.id_length]='\0';
 299       (void) SetImageProperty(image,"comment",comment,exception);
 300       comment=DestroyString(comment);
 301     }
 302   (void) ResetMagickMemory(&pixel,0,sizeof(pixel));
 303   pixel.alpha=(MagickRealType) OpaqueAlpha;
 304   if (tga_info.colormap_type != 0)
 305     {
 306       /*
 307         Read TGA raster colormap.
 308       */
 309       if (AcquireImageColormap(image,image->colors,exception) == MagickFalse)
 310         ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 311       for (i=0; i < (ssize_t) image->colors; i++)
 312       {
 313         switch (tga_info.colormap_size)
 314         {
 315           case 8:
 316           default:
 317           {
 318             /*
 319               Gray scale.
 320             */
 321             pixel.red=(MagickRealType) ScaleCharToQuantum((unsigned char)
 322               ReadBlobByte(image));
 323             pixel.green=pixel.red;
 324             pixel.blue=pixel.red;
 325             break;
 326           }
 327           case 15:
 328           case 16:
 329           {
 330             QuantumAny
 331               range;
 332
 333             /*
 334               5 bits each of red green and blue.
 335             */
 336             j=(unsigned char) ReadBlobByte(image);
 337             k=(unsigned char) ReadBlobByte(image);
 338             range=GetQuantumRange(5UL);
 339             pixel.red=(MagickRealType) ScaleAnyToQuantum(1UL*(k & 0x7c) >> 2,
 340               range);
 341             pixel.green=(MagickRealType) ScaleAnyToQuantum((1UL*(k & 0x03)
 342               << 3)+(1UL*(j & 0xe0) >> 5),range);
 343             pixel.blue=(MagickRealType) ScaleAnyToQuantum(1UL*(j & 0x1f),range);
 344             break;
 345           }
 346           case 24:
 347           {
 348             /*
 349               8 bits each of blue, green and red.
 350             */
 351             pixel.blue=(MagickRealType) ScaleCharToQuantum((unsigned char)
 352               ReadBlobByte(image));
 353             pixel.green=(MagickRealType) ScaleCharToQuantum((unsigned char)
 354               ReadBlobByte(image));
 355             pixel.red=(MagickRealType) ScaleCharToQuantum((unsigned char)
 356               ReadBlobByte(image));
 357             break;
 358           }
 359           case 32:
 360           {
 361             /*
 362               8 bits each of blue, green, red, and alpha.
 363             */
 364             pixel.blue=(MagickRealType) ScaleCharToQuantum((unsigned char)
 365               ReadBlobByte(image));
 366             pixel.green=(MagickRealType) ScaleCharToQuantum((unsigned char)
 367               ReadBlobByte(image));
 368             pixel.red=(MagickRealType) ScaleCharToQuantum((unsigned char)
 369               ReadBlobByte(image));
 370             pixel.alpha=(MagickRealType) ScaleCharToQuantum((unsigned char)
 371               ReadBlobByte(image));
 372             break;
 373           }
 374         }
 375         image->colormap[i]=pixel;
 376       }
 377     }
 378   /*
 379     Convert TGA pixels to pixel packets.
 380   */
 381   base=0;
 382   flag=0;
 383   skip=MagickFalse;
 384   real=0;
 385   index=0;
 386   runlength=0;
 387   offset=0;
 388   for (y=0; y < (ssize_t) image->rows; y++)
 389   {
 390     real=offset;
 391     if (((unsigned char) (tga_info.attributes & 0x20) >> 5) == 0)
 392       real=image->rows-real-1;
 393     q=QueueAuthenticPixels(image,0,(ssize_t) real,image->columns,1,exception);
 394     if (q == (Quantum *) NULL)
 395       break;
 396     for (x=0; x < (ssize_t) image->columns; x++)
 397     {
 398       if ((tga_info.image_type == TGARLEColormap) ||
 399           (tga_info.image_type == TGARLERGB) ||
 400           (tga_info.image_type == TGARLEMonochrome))
 401         {
 402           if (runlength != 0)
 403             {
 404               runlength--;
 405               skip=flag != 0;
 406             }
 407           else
 408             {
 409               count=ReadBlob(image,1,&runlength);
 410               if (count == 0)
 411                 ThrowReaderException(CorruptImageError,"UnableToReadImageData");
 412               flag=runlength & 0x80;
 413               if (flag != 0)
 414                 runlength-=128;
 415               skip=MagickFalse;
 416             }
 417         }
 418       if (skip == MagickFalse)
 419         switch (tga_info.bits_per_pixel)
 420         {
 421           case 8:
 422           default:
 423           {
 424             /*
 425               Gray scale.
 426             */
 427             index=(Quantum) ReadBlobByte(image);
 428             if (tga_info.colormap_type != 0)
 429               pixel=image->colormap[(ssize_t) ConstrainColormapIndex(image,
 430                 1UL*index,exception)];
 431             else
 432               {
 433                 pixel.red=(MagickRealType) ScaleCharToQuantum((unsigned char)
 434                   index);
 435                 pixel.green=(MagickRealType) ScaleCharToQuantum((unsigned char)
 436                   index);
 437                 pixel.blue=(MagickRealType) ScaleCharToQuantum((unsigned char)
 438                   index);
 439               }
 440             break;
 441           }
 442           case 15:
 443           case 16:
 444           {
 445             QuantumAny
 446               range;
 447
 448             /*
 449               5 bits each of RGB.
 450             */
 451             if (ReadBlob(image,2,pixels) != 2)
 452               ThrowReaderException(CorruptImageError,"UnableToReadImageData");
 453             j=pixels[0];
 454             k=pixels[1];
 455             range=GetQuantumRange(5UL);
 456             pixel.red=(MagickRealType) ScaleAnyToQuantum(1UL*(k & 0x7c) >> 2,
 457               range);
 458             pixel.green=(MagickRealType) ScaleAnyToQuantum((1UL*(k & 0x03)
 459               << 3)+(1UL*(j & 0xe0) >> 5),range);
 460             pixel.blue=(MagickRealType) ScaleAnyToQuantum(1UL*(j & 0x1f),range);
 461             if (image->alpha_trait == BlendPixelTrait)
 462               pixel.alpha=(MagickRealType) ((k & 0x80) == 0 ? (Quantum)
 463                 OpaqueAlpha : (Quantum) TransparentAlpha);
 464             if (image->storage_class == PseudoClass)
 465               index=ConstrainColormapIndex(image,((size_t) k << 8)+j,exception);
 466             break;
 467           }
 468           case 24:
 469           {
 470             /*
 471               BGR pixels.
 472             */
 473             if (ReadBlob(image,3,pixels) != 3)
 474               ThrowReaderException(CorruptImageError,"UnableToReadImageData");
 475             pixel.blue=(MagickRealType) ScaleCharToQuantum(pixels[0]);
 476             pixel.green=(MagickRealType) ScaleCharToQuantum(pixels[1]);
 477             pixel.red=(MagickRealType) ScaleCharToQuantum(pixels[2]);
 478             break;
 479           }
 480           case 32:
 481           {
 482             /*
 483               BGRA pixels.
 484             */
 485             if (ReadBlob(image,4,pixels) != 4)
 486               ThrowReaderException(CorruptImageError,"UnableToReadImageData");
 487             pixel.blue=(MagickRealType) ScaleCharToQuantum(pixels[0]);
 488             pixel.green=(MagickRealType) ScaleCharToQuantum(pixels[1]);
 489             pixel.red=(MagickRealType) ScaleCharToQuantum(pixels[2]);
 490             pixel.alpha=(MagickRealType) ScaleCharToQuantum(pixels[3]);
 491             break;
 492           }
 493         }
 494       if (status == MagickFalse)
 495         ThrowReaderException(CorruptImageError,"UnableToReadImageData");
 496       if (image->storage_class == PseudoClass)
 497         SetPixelIndex(image,index,q);
 498       SetPixelRed(image,ClampToQuantum(pixel.red),q);
 499       SetPixelGreen(image,ClampToQuantum(pixel.green),q);
 500       SetPixelBlue(image,ClampToQuantum(pixel.blue),q);
 501       if (image->alpha_trait == BlendPixelTrait)
 502         SetPixelAlpha(image,ClampToQuantum(pixel.alpha),q);
 503       q+=GetPixelChannels(image);
 504     }
 505     if (((unsigned char) (tga_info.attributes & 0xc0) >> 6) == 4)
 506       offset+=4;
 507     else
 508       if (((unsigned char) (tga_info.attributes & 0xc0) >> 6) == 2)
 509         offset+=2;
 510       else
 511         offset++;
 512     if (offset >= image->rows)
 513       {
 514         base++;
 515         offset=base;
 516       }
 517     if (SyncAuthenticPixels(image,exception) == MagickFalse)
 518       break;
 519     if (image->previous == (Image *) NULL)
 520       {
 521         status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
 522           image->rows);
 523         if (status == MagickFalse)
 524           break;
 525       }
 526   }
 527   if (EOFBlob(image) != MagickFalse)
 528     ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
 529       image->filename);
 530   (void) CloseBlob(image);
 531   return(GetFirstImageInList(image));
 532 }
 533 \f
 534 /*
 535 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 536 %                                                                             %
 537 %                                                                             %
 538 %                                                                             %
 539 %   R e g i s t e r T G A I m a g e                                           %
 540 %                                                                             %
 541 %                                                                             %
 542 %                                                                             %
 543 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 544 %
 545 %  RegisterTGAImage() adds properties for the TGA image format to
 546 %  the list of supported formats.  The properties include the image format
 547 %  tag, a method to read and/or write the format, whether the format
 548 %  supports the saving of more than one frame to the same file or blob,
 549 %  whether the format supports native in-memory I/O, and a brief
 550 %  description of the format.
 551 %
 552 %  The format of the RegisterTGAImage method is:
 553 %
 554 %      size_t RegisterTGAImage(void)
 555 %
 556 */
 557 ModuleExport size_t RegisterTGAImage(void)
 558 {
 559   MagickInfo
 560     *entry;
 561
 562   entry=SetMagickInfo("ICB");
 563   entry->decoder=(DecodeImageHandler *) ReadTGAImage;
 564   entry->encoder=(EncodeImageHandler *) WriteTGAImage;
 565   entry->adjoin=MagickFalse;
 566   entry->description=ConstantString("Truevision Targa image");
 567   entry->module=ConstantString("TGA");
 568   (void) RegisterMagickInfo(entry);
 569   entry=SetMagickInfo("TGA");
 570   entry->decoder=(DecodeImageHandler *) ReadTGAImage;
 571   entry->encoder=(EncodeImageHandler *) WriteTGAImage;
 572   entry->adjoin=MagickFalse;
 573   entry->description=ConstantString("Truevision Targa image");
 574   entry->module=ConstantString("TGA");
 575   (void) RegisterMagickInfo(entry);
 576   entry=SetMagickInfo("VDA");
 577   entry->decoder=(DecodeImageHandler *) ReadTGAImage;
 578   entry->encoder=(EncodeImageHandler *) WriteTGAImage;
 579   entry->adjoin=MagickFalse;
 580   entry->description=ConstantString("Truevision Targa image");
 581   entry->module=ConstantString("TGA");
 582   (void) RegisterMagickInfo(entry);
 583   entry=SetMagickInfo("VST");
 584   entry->decoder=(DecodeImageHandler *) ReadTGAImage;
 585   entry->encoder=(EncodeImageHandler *) WriteTGAImage;
 586   entry->adjoin=MagickFalse;
 587   entry->description=ConstantString("Truevision Targa image");
 588   entry->module=ConstantString("TGA");
 589   (void) RegisterMagickInfo(entry);
 590   return(MagickImageCoderSignature);
 591 }
 592 \f
 593 /*
 594 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 595 %                                                                             %
 596 %                                                                             %
 597 %                                                                             %
 598 %   U n r e g i s t e r T G A I m a g e                                       %
 599 %                                                                             %
 600 %                                                                             %
 601 %                                                                             %
 602 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 603 %
 604 %  UnregisterTGAImage() removes format registrations made by the
 605 %  TGA module from the list of supported formats.
 606 %
 607 %  The format of the UnregisterTGAImage method is:
 608 %
 609 %      UnregisterTGAImage(void)
 610 %
 611 */
 612 ModuleExport void UnregisterTGAImage(void)
 613 {
 614   (void) UnregisterMagickInfo("ICB");
 615   (void) UnregisterMagickInfo("TGA");
 616   (void) UnregisterMagickInfo("VDA");
 617   (void) UnregisterMagickInfo("VST");
 618 }
 619 \f
 620 /*
 621 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 622 %                                                                             %
 623 %                                                                             %
 624 %                                                                             %
 625 %   W r i t e T G A I m a g e                                                 %
 626 %                                                                             %
 627 %                                                                             %
 628 %                                                                             %
 629 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 630 %
 631 %  WriteTGAImage() writes a image in the Truevision Targa rasterfile
 632 %  format.
 633 %
 634 %  The format of the WriteTGAImage method is:
 635 %
 636 %      MagickBooleanType WriteTGAImage(const ImageInfo *image_info,
 637 %        Image *image,ExceptionInfo *exception)
 638 %
 639 %  A description of each parameter follows.
 640 %
 641 %    o image_info: the image info.
 642 %
 643 %    o image:  The image.
 644 %
 645 */
 646
 647 static inline size_t MagickMin(const size_t x,const size_t y)
 648 {
 649   if (x < y)
 650     return(x);
 651   return(y);
 652 }
 653
 654 static inline void WriteTGAPixel(Image *image,TGAImageType image_type,
 655   const Quantum *p)
 656 {
 657   if (image_type == TGAColormap || image_type == TGARLEColormap)
 658     (void) WriteBlobByte(image,(unsigned char) GetPixelIndex(image,p));
 659   else
 660     {
 661       if (image_type == TGAMonochrome || image_type == TGARLEMonochrome)
 662         (void) WriteBlobByte(image,ScaleQuantumToChar(ClampToQuantum(
 663           GetPixelLuma(image,p))));
 664       else
 665         {
 666           (void) WriteBlobByte(image,ScaleQuantumToChar(GetPixelBlue(image,
 667             p)));
 668           (void) WriteBlobByte(image,ScaleQuantumToChar(GetPixelGreen(image,
 669             p)));
 670           (void) WriteBlobByte(image,ScaleQuantumToChar(GetPixelRed(image,p)));
 671           if (image->alpha_trait == BlendPixelTrait)
 672             (void) WriteBlobByte(image,ScaleQuantumToChar(GetPixelAlpha(image,
 673               p)));
 674         }
 675     }
 676 }
 677
 678 static MagickBooleanType WriteTGAImage(const ImageInfo *image_info,Image *image,
 679   ExceptionInfo *exception)
 680 {
 681   CompressionType
 682     compression;
 683
 684   const char
 685     *value;
 686
 687   MagickBooleanType
 688     status;
 689
 690   register const Quantum
 691     *p;
 692
 693   register ssize_t
 694     x;
 695
 696   register ssize_t
 697     i;
 698
 699   register unsigned char
 700     *q;
 701
 702   size_t
 703     channels;
 704
 705   ssize_t
 706     count,
 707     y;
 708
 709   TGAInfo
 710     tga_info;
 711
 712   /*
 713     Open output image file.
 714   */
 715   assert(image_info != (const ImageInfo *) NULL);
 716   assert(image_info->signature == MagickSignature);
 717   assert(image != (Image *) NULL);
 718   assert(image->signature == MagickSignature);
 719   if (image->debug != MagickFalse)
 720     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 721   assert(exception != (ExceptionInfo *) NULL);
 722   assert(exception->signature == MagickSignature);
 723   status=OpenBlob(image_info,image,WriteBinaryBlobMode,exception);
 724   if (status == MagickFalse)
 725     return(status);
 726   /*
 727     Initialize TGA raster file header.
 728   */
 729   if ((image->columns > 65535L) || (image->rows > 65535L))
 730     ThrowWriterException(ImageError,"WidthOrHeightExceedsLimit");
 731   (void) TransformImageColorspace(image,sRGBColorspace,exception);
 732   compression=image->compression;
 733   if (image_info->compression != UndefinedCompression)
 734     compression=image_info->compression;
 735   tga_info.id_length=0;
 736   value=GetImageProperty(image,"comment",exception);
 737   if (value != (const char *) NULL)
 738     tga_info.id_length=(unsigned char) MagickMin(strlen(value),255);
 739   tga_info.colormap_type=0;
 740   tga_info.colormap_index=0;
 741   tga_info.colormap_length=0;
 742   tga_info.colormap_size=0;
 743   tga_info.x_origin=0;
 744   tga_info.y_origin=0;
 745   tga_info.width=(unsigned short) image->columns;
 746   tga_info.height=(unsigned short) image->rows;
 747   tga_info.bits_per_pixel=8;
 748   tga_info.attributes=0;
 749   if ((image_info->type != TrueColorType) &&
 750       (image_info->type != TrueColorMatteType) &&
 751       (image_info->type != PaletteType) &&
 752       (image->alpha_trait != BlendPixelTrait) &&
 753       (IsImageGray(image,exception) != MagickFalse))
 754     tga_info.image_type=compression == RLECompression ? TGARLEMonochrome :
 755       TGAMonochrome;
 756   else
 757     if ((image->storage_class == DirectClass) || (image->colors > 256))
 758       {
 759         /*
 760           Full color TGA raster.
 761         */
 762         tga_info.image_type=compression == RLECompression ? TGARLERGB :
 763           TGARGB;
 764         tga_info.bits_per_pixel=24;
 765         if (image->alpha_trait == BlendPixelTrait)
 766           {
 767             tga_info.bits_per_pixel=32;
 768             tga_info.attributes=8;  /* # of alpha bits */
 769           }
 770       }
 771     else
 772       {
 773         /*
 774           Colormapped TGA raster.
 775         */
 776         tga_info.image_type=compression == RLECompression ? TGARLEColormap :
 777           TGAColormap;
 778         tga_info.colormap_type=1;
 779         tga_info.colormap_length=(unsigned short) image->colors;
 780         tga_info.colormap_size=24;
 781       }
 782   /*
 783     Write TGA header.
 784   */
 785   (void) WriteBlobByte(image,tga_info.id_length);
 786   (void) WriteBlobByte(image,tga_info.colormap_type);
 787   (void) WriteBlobByte(image,tga_info.image_type);
 788   (void) WriteBlobLSBShort(image,tga_info.colormap_index);
 789   (void) WriteBlobLSBShort(image,tga_info.colormap_length);
 790   (void) WriteBlobByte(image,tga_info.colormap_size);
 791   (void) WriteBlobLSBShort(image,tga_info.x_origin);
 792   (void) WriteBlobLSBShort(image,tga_info.y_origin);
 793   (void) WriteBlobLSBShort(image,tga_info.width);
 794   (void) WriteBlobLSBShort(image,tga_info.height);
 795   (void) WriteBlobByte(image,tga_info.bits_per_pixel);
 796   (void) WriteBlobByte(image,tga_info.attributes);
 797   if (tga_info.id_length != 0)
 798     (void) WriteBlob(image,tga_info.id_length,(unsigned char *)
 799       value);
 800   if (tga_info.colormap_type != 0)
 801     {
 802       unsigned char
 803         *targa_colormap;
 804
 805       /*
 806         Dump colormap to file (blue, green, red byte order).
 807       */
 808       targa_colormap=(unsigned char *) AcquireQuantumMemory((size_t)
 809         tga_info.colormap_length,3UL*sizeof(*targa_colormap));
 810       if (targa_colormap == (unsigned char *) NULL)
 811         ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 812       q=targa_colormap;
 813       for (i=0; i < (ssize_t) image->colors; i++)
 814       {
 815         *q++=ScaleQuantumToChar(ClampToQuantum(image->colormap[i].blue));
 816         *q++=ScaleQuantumToChar(ClampToQuantum(image->colormap[i].green));
 817         *q++=ScaleQuantumToChar(ClampToQuantum(image->colormap[i].red));
 818       }
 819       (void) WriteBlob(image,(size_t) (3*tga_info.colormap_length),
 820         targa_colormap);
 821       targa_colormap=(unsigned char *) RelinquishMagickMemory(targa_colormap);
 822     }
 823   /*
 824     Convert MIFF to TGA raster pixels.
 825   */
 826   channels=GetPixelChannels(image);
 827   for (y=(ssize_t) (image->rows-1); y >= 0; y--)
 828   {
 829     p=GetVirtualPixels(image,0,y,image->columns,1,exception);
 830     if (p == (const Quantum *) NULL)
 831       break;
 832     if (compression == RLECompression)
 833       {
 834         x=0;
 835         count=0;
 836         while (x < (ssize_t) image->columns)
 837         {
 838           i=1;
 839           while ((i < 128) && (count + i < 128) &&
 840                  ((x + i) < (ssize_t) image->columns))
 841           {
 842             if (tga_info.image_type == TGARLEColormap)
 843               {
 844                 if (GetPixelIndex(image,p+(i*channels)) !=
 845                     GetPixelIndex(image,p+((i-1)*channels)))
 846                   break;
 847               }
 848             else if (tga_info.image_type == TGARLEMonochrome)
 849               {
 850                 if (GetPixelLuma(image,p+(i*channels)) !=
 851                     GetPixelLuma(image,p+((i-1)*channels)))
 852                   break;
 853               }
 854             else
 855               {
 856                 if ((GetPixelBlue(image,p+(i*channels)) !=
 857                      GetPixelBlue(image,p+((i-1)*channels))) ||
 858                     (GetPixelGreen(image,p+(i*channels)) !=
 859                      GetPixelGreen(image,p+((i-1)*channels))) ||
 860                     (GetPixelRed(image,p+(i*channels)) !=
 861                      GetPixelRed(image,p+((i-1)*channels))))
 862                   break;
 863                 if ((image->alpha_trait == BlendPixelTrait) &&
 864                     (GetPixelAlpha(image,p+(i*channels)) !=
 865                      GetPixelAlpha(image,p+(i-1)*channels)))
 866                   break;
 867               }
 868             i++;
 869           }
 870           if (i < 3)
 871             {
 872               count+=i;
 873               p+=(i*channels);
 874             }
 875           if ((i >= 3) || (count == 128) ||
 876               ((x + i) == (ssize_t) image->columns))
 877             {
 878               if (count > 0)
 879                 {
 880                   WriteBlobByte(image,(unsigned char) (--count));
 881                   while (count >= 0)
 882                   {
 883                     WriteTGAPixel(image,tga_info.image_type,p-((count+1)*
 884                       channels));
 885                     count--;
 886                   }
 887                   count=0;
 888                 }
 889             }
 890           if (i >= 3)
 891             {
 892               WriteBlobByte(image,(unsigned char) (i-1 | 0x80));
 893               WriteTGAPixel(image,tga_info.image_type,p);
 894               p+=(i*channels);
 895             }
 896           x+=i;
 897         }
 898       }
 899     else
 900       {
 901         for (x=0; x < (ssize_t) image->columns; x++)
 902           {
 903             WriteTGAPixel(image,tga_info.image_type,p);
 904             p+=channels;
 905           }
 906       }
 907     if (image->previous == (Image *) NULL)
 908       {
 909         status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
 910           image->rows);
 911         if (status == MagickFalse)
 912           break;
 913       }
 914   }
 915   (void) CloseBlob(image);
 916   return(MagickTrue);
 917 }