dlls/windowscodecs/tgaformat.c

   1 /*
   2  * Copyright 2010 Vincent Povirk for CodeWeavers
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  17  */
  18
  19 #include "config.h"
  20 #include "wine/port.h"
  21
  22 #include <stdarg.h>
  23
  24 #define COBJMACROS
  25
  26 #include "windef.h"
  27 #include "winbase.h"
  28 #include "objbase.h"
  29 #include "wincodec.h"
  30
  31 #include "wincodecs_private.h"
  32
  33 #include "wine/debug.h"
  34 #include "wine/library.h"
  35
  36 WINE_DEFAULT_DEBUG_CHANNEL(wincodecs);
  37
  38 #include "pshpack1.h"
  39
  40 typedef struct {
  41     BYTE id_length;
  42     BYTE colormap_type;
  43     BYTE image_type;
  44     /* Colormap Specification */
  45     WORD colormap_firstentry;
  46     WORD colormap_length;
  47     BYTE colormap_entrysize;
  48     /* Image Specification */
  49     WORD xorigin;
  50     WORD yorigin;
  51     WORD width;
  52     WORD height;
  53     BYTE depth;
  54     BYTE image_descriptor;
  55 } tga_header;
  56
  57 #define IMAGETYPE_COLORMAPPED 1
  58 #define IMAGETYPE_TRUECOLOR 2
  59 #define IMAGETYPE_GRAYSCALE 3
  60 #define IMAGETYPE_RLE 8
  61
  62 #define IMAGE_ATTRIBUTE_BITCOUNT_MASK 0xf
  63 #define IMAGE_RIGHTTOLEFT 0x10
  64 #define IMAGE_TOPTOBOTTOM 0x20
  65
  66 typedef struct {
  67     DWORD extension_area_offset;
  68     DWORD developer_directory_offset;
  69     char magic[18];
  70 } tga_footer;
  71
  72 static const BYTE tga_footer_magic[18] = "TRUEVISION-XFILE.";
  73
  74 typedef struct {
  75     WORD size;
  76     char author_name[41];
  77     char author_comments[324];
  78     WORD timestamp[6];
  79     char job_name[41];
  80     WORD job_timestamp[6];
  81     char software_id[41];
  82     WORD software_version;
  83     char software_version_letter;
  84     DWORD key_color;
  85     WORD pixel_width;
  86     WORD pixel_height;
  87     WORD gamma_numerator;
  88     WORD gamma_denominator;
  89     DWORD color_correction_offset;
  90     DWORD thumbnail_offset;
  91     DWORD scanline_offset;
  92     BYTE attributes_type;
  93 } tga_extension_area;
  94
  95 #define ATTRIBUTE_NO_ALPHA 0
  96 #define ATTRIBUTE_UNDEFINED 1
  97 #define ATTRIBUTE_UNDEFINED_PRESERVE 2
  98 #define ATTRIBUTE_ALPHA 3
  99 #define ATTRIBUTE_PALPHA 4
 100
 101 #include "poppack.h"
 102
 103 typedef struct {
 104     IWICBitmapDecoder IWICBitmapDecoder_iface;
 105     IWICBitmapFrameDecode IWICBitmapFrameDecode_iface;
 106     LONG ref;
 107     BOOL initialized;
 108     IStream *stream;
 109     tga_header header;
 110     tga_extension_area extension_area;
 111     BYTE *imagebits;
 112     BYTE *origin;
 113     int stride;
 114     ULONG id_offset;
 115     ULONG colormap_length;
 116     ULONG colormap_offset;
 117     ULONG image_offset;
 118     ULONG extension_area_offset;
 119     ULONG developer_directory_offset;
 120     CRITICAL_SECTION lock;
 121 } TgaDecoder;
 122
 123 static inline TgaDecoder *impl_from_IWICBitmapDecoder(IWICBitmapDecoder *iface)
 124 {
 125     return CONTAINING_RECORD(iface, TgaDecoder, IWICBitmapDecoder_iface);
 126 }
 127
 128 static inline TgaDecoder *impl_from_IWICBitmapFrameDecode(IWICBitmapFrameDecode *iface)
 129 {
 130     return CONTAINING_RECORD(iface, TgaDecoder, IWICBitmapFrameDecode_iface);
 131 }
 132
 133 static HRESULT WINAPI TgaDecoder_QueryInterface(IWICBitmapDecoder *iface, REFIID iid,
 134     void **ppv)
 135 {
 136     TgaDecoder *This = impl_from_IWICBitmapDecoder(iface);
 137     TRACE("(%p,%s,%p)\n", iface, debugstr_guid(iid), ppv);
 138
 139     if (!ppv) return E_INVALIDARG;
 140
 141     if (IsEqualIID(&IID_IUnknown, iid) || IsEqualIID(&IID_IWICBitmapDecoder, iid))
 142     {
 143         *ppv = This;
 144     }
 145     else
 146     {
 147         *ppv = NULL;
 148         return E_NOINTERFACE;
 149     }
 150
 151     IUnknown_AddRef((IUnknown*)*ppv);
 152     return S_OK;
 153 }
 154
 155 static ULONG WINAPI TgaDecoder_AddRef(IWICBitmapDecoder *iface)
 156 {
 157     TgaDecoder *This = impl_from_IWICBitmapDecoder(iface);
 158     ULONG ref = InterlockedIncrement(&This->ref);
 159
 160     TRACE("(%p) refcount=%u\n", iface, ref);
 161
 162     return ref;
 163 }
 164
 165 static ULONG WINAPI TgaDecoder_Release(IWICBitmapDecoder *iface)
 166 {
 167     TgaDecoder *This = impl_from_IWICBitmapDecoder(iface);
 168     ULONG ref = InterlockedDecrement(&This->ref);
 169
 170     TRACE("(%p) refcount=%u\n", iface, ref);
 171
 172     if (ref == 0)
 173     {
 174         This->lock.DebugInfo->Spare[0] = 0;
 175         DeleteCriticalSection(&This->lock);
 176         if (This->stream)
 177             IStream_Release(This->stream);
 178         HeapFree(GetProcessHeap(), 0, This->imagebits);
 179         HeapFree(GetProcessHeap(), 0, This);
 180     }
 181
 182     return ref;
 183 }
 184
 185 static HRESULT WINAPI TgaDecoder_QueryCapability(IWICBitmapDecoder *iface, IStream *pIStream,
 186     DWORD *pdwCapability)
 187 {
 188     FIXME("(%p,%p,%p): stub\n", iface, pIStream, pdwCapability);
 189     return E_NOTIMPL;
 190 }
 191
 192 static HRESULT WINAPI TgaDecoder_Initialize(IWICBitmapDecoder *iface, IStream *pIStream,
 193     WICDecodeOptions cacheOptions)
 194 {
 195     TgaDecoder *This = impl_from_IWICBitmapDecoder(iface);
 196     HRESULT hr=S_OK;
 197     DWORD bytesread;
 198     LARGE_INTEGER seek;
 199     tga_footer footer;
 200     int attribute_bitcount;
 201     int mapped_depth=0;
 202
 203     TRACE("(%p,%p,%u)\n", iface, pIStream, cacheOptions);
 204
 205     EnterCriticalSection(&This->lock);
 206
 207     if (This->initialized)
 208     {
 209         hr = WINCODEC_ERR_WRONGSTATE;
 210         goto end;
 211     }
 212
 213     seek.QuadPart = 0;
 214     hr = IStream_Seek(pIStream, seek, STREAM_SEEK_SET, NULL);
 215     if (FAILED(hr)) goto end;
 216
 217     hr = IStream_Read(pIStream, &This->header, sizeof(tga_header), &bytesread);
 218     if (SUCCEEDED(hr) && bytesread != sizeof(tga_header))
 219     {
 220         TRACE("got only %u bytes\n", bytesread);
 221         hr = E_FAIL;
 222     }
 223     if (FAILED(hr)) goto end;
 224
 225     TRACE("imagetype=%u, colormap type=%u, depth=%u, image descriptor=0x%x\n",
 226         This->header.image_type, This->header.colormap_type,
 227         This->header.depth, This->header.image_descriptor);
 228
 229     /* Sanity checking. Since TGA has no clear identifying markers, we need
 230      * to be careful to not load a non-TGA image. */
 231     switch (This->header.image_type)
 232     {
 233     case IMAGETYPE_COLORMAPPED:
 234     case IMAGETYPE_COLORMAPPED|IMAGETYPE_RLE:
 235         if (This->header.colormap_type != 1)
 236             hr = E_FAIL;
 237         mapped_depth = This->header.colormap_entrysize;
 238         break;
 239     case IMAGETYPE_TRUECOLOR:
 240     case IMAGETYPE_TRUECOLOR|IMAGETYPE_RLE:
 241         if (This->header.colormap_type != 0 && This->header.colormap_type != 1)
 242             hr = E_FAIL;
 243         mapped_depth = This->header.depth;
 244         break;
 245     case IMAGETYPE_GRAYSCALE:
 246     case IMAGETYPE_GRAYSCALE|IMAGETYPE_RLE:
 247         if (This->header.colormap_type != 0)
 248             hr = E_FAIL;
 249         mapped_depth = 0;
 250         break;
 251     default:
 252         hr = E_FAIL;
 253     }
 254
 255     if (This->header.depth != 8 && This->header.depth != 16 &&
 256         This->header.depth != 24 && This->header.depth != 32)
 257         hr = E_FAIL;
 258
 259     if ((This->header.image_descriptor & 0xc0) != 0)
 260         hr = E_FAIL;
 261
 262     attribute_bitcount = This->header.image_descriptor & IMAGE_ATTRIBUTE_BITCOUNT_MASK;
 263
 264     if (attribute_bitcount &&
 265         !((mapped_depth == 32 && attribute_bitcount == 8) ||
 266           (mapped_depth == 16 && attribute_bitcount == 1)))
 267         hr = E_FAIL;
 268
 269     if (FAILED(hr))
 270     {
 271         WARN("bad tga header\n");
 272         goto end;
 273     }
 274
 275     /* Locate data in the file based on the header. */
 276     This->id_offset = sizeof(tga_header);
 277     This->colormap_offset = This->id_offset + This->header.id_length;
 278     if (This->header.colormap_type == 1)
 279         This->colormap_length = ((This->header.colormap_entrysize+7)/8) * This->header.colormap_length;
 280     else
 281         This->colormap_length = 0;
 282     This->image_offset = This->colormap_offset + This->colormap_length;
 283
 284     /* Read footer if there is one */
 285     seek.QuadPart = -sizeof(tga_footer);
 286     hr = IStream_Seek(pIStream, seek, STREAM_SEEK_END, NULL);
 287
 288     if (SUCCEEDED(hr)) {
 289         hr = IStream_Read(pIStream, &footer, sizeof(tga_footer), &bytesread);
 290         if (SUCCEEDED(hr) && bytesread != sizeof(tga_footer))
 291         {
 292             TRACE("got only %u footer bytes\n", bytesread);
 293             hr = E_FAIL;
 294         }
 295
 296         if (memcmp(footer.magic, tga_footer_magic, sizeof(tga_footer_magic)) == 0)
 297         {
 298             This->extension_area_offset = footer.extension_area_offset;
 299             This->developer_directory_offset = footer.developer_directory_offset;
 300         }
 301         else
 302         {
 303             This->extension_area_offset = 0;
 304             This->developer_directory_offset = 0;
 305         }
 306     }
 307     else
 308     {
 309         /* File is too small to have a footer. */
 310         This->extension_area_offset = 0;
 311         This->developer_directory_offset = 0;
 312         hr = S_OK;
 313     }
 314
 315     if (This->extension_area_offset)
 316     {
 317         seek.QuadPart = This->extension_area_offset;
 318         hr = IStream_Seek(pIStream, seek, STREAM_SEEK_SET, NULL);
 319         if (FAILED(hr)) goto end;
 320
 321         hr = IStream_Read(pIStream, &This->extension_area, sizeof(tga_extension_area), &bytesread);
 322         if (SUCCEEDED(hr) && bytesread != sizeof(tga_extension_area))
 323         {
 324             TRACE("got only %u extension area bytes\n", bytesread);
 325             hr = E_FAIL;
 326         }
 327         if (SUCCEEDED(hr) && This->extension_area.size < 495)
 328         {
 329             TRACE("extension area is only %u bytes long\n", This->extension_area.size);
 330             hr = E_FAIL;
 331         }
 332         if (FAILED(hr)) goto end;
 333     }
 334
 335     IStream_AddRef(pIStream);
 336     This->stream = pIStream;
 337     This->initialized = TRUE;
 338
 339 end:
 340     LeaveCriticalSection(&This->lock);
 341     return hr;
 342 }
 343
 344 static HRESULT WINAPI TgaDecoder_GetContainerFormat(IWICBitmapDecoder *iface,
 345     GUID *pguidContainerFormat)
 346 {
 347     memcpy(pguidContainerFormat, &GUID_WineContainerFormatTga, sizeof(GUID));
 348     return S_OK;
 349 }
 350
 351 static HRESULT WINAPI TgaDecoder_GetDecoderInfo(IWICBitmapDecoder *iface,
 352     IWICBitmapDecoderInfo **ppIDecoderInfo)
 353 {
 354     FIXME("(%p,%p): stub\n", iface, ppIDecoderInfo);
 355     return E_NOTIMPL;
 356 }
 357
 358 static HRESULT WINAPI TgaDecoder_CopyPalette(IWICBitmapDecoder *iface,
 359     IWICPalette *pIPalette)
 360 {
 361     FIXME("(%p,%p): stub\n", iface, pIPalette);
 362     return E_NOTIMPL;
 363 }
 364
 365 static HRESULT WINAPI TgaDecoder_GetMetadataQueryReader(IWICBitmapDecoder *iface,
 366     IWICMetadataQueryReader **ppIMetadataQueryReader)
 367 {
 368     FIXME("(%p,%p): stub\n", iface, ppIMetadataQueryReader);
 369     return E_NOTIMPL;
 370 }
 371
 372 static HRESULT WINAPI TgaDecoder_GetPreview(IWICBitmapDecoder *iface,
 373     IWICBitmapSource **ppIBitmapSource)
 374 {
 375     FIXME("(%p,%p): stub\n", iface, ppIBitmapSource);
 376     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 377 }
 378
 379 static HRESULT WINAPI TgaDecoder_GetColorContexts(IWICBitmapDecoder *iface,
 380     UINT cCount, IWICColorContext **ppIColorContexts, UINT *pcActualCount)
 381 {
 382     FIXME("(%p,%u,%p,%p): stub\n", iface, cCount, ppIColorContexts, pcActualCount);
 383     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 384 }
 385
 386 static HRESULT WINAPI TgaDecoder_GetThumbnail(IWICBitmapDecoder *iface,
 387     IWICBitmapSource **ppIThumbnail)
 388 {
 389     FIXME("(%p,%p): stub\n", iface, ppIThumbnail);
 390     return WINCODEC_ERR_CODECNOTHUMBNAIL;
 391 }
 392
 393 static HRESULT WINAPI TgaDecoder_GetFrameCount(IWICBitmapDecoder *iface,
 394     UINT *pCount)
 395 {
 396     *pCount = 1;
 397     return S_OK;
 398 }
 399
 400 static HRESULT WINAPI TgaDecoder_GetFrame(IWICBitmapDecoder *iface,
 401     UINT index, IWICBitmapFrameDecode **ppIBitmapFrame)
 402 {
 403     TgaDecoder *This = impl_from_IWICBitmapDecoder(iface);
 404     TRACE("(%p,%p)\n", iface, ppIBitmapFrame);
 405
 406     if (!This->initialized) return WINCODEC_ERR_NOTINITIALIZED;
 407
 408     if (index != 0) return E_INVALIDARG;
 409
 410     IWICBitmapDecoder_AddRef(iface);
 411     *ppIBitmapFrame = &This->IWICBitmapFrameDecode_iface;
 412
 413     return S_OK;
 414 }
 415
 416 static const IWICBitmapDecoderVtbl TgaDecoder_Vtbl = {
 417     TgaDecoder_QueryInterface,
 418     TgaDecoder_AddRef,
 419     TgaDecoder_Release,
 420     TgaDecoder_QueryCapability,
 421     TgaDecoder_Initialize,
 422     TgaDecoder_GetContainerFormat,
 423     TgaDecoder_GetDecoderInfo,
 424     TgaDecoder_CopyPalette,
 425     TgaDecoder_GetMetadataQueryReader,
 426     TgaDecoder_GetPreview,
 427     TgaDecoder_GetColorContexts,
 428     TgaDecoder_GetThumbnail,
 429     TgaDecoder_GetFrameCount,
 430     TgaDecoder_GetFrame
 431 };
 432
 433 static HRESULT WINAPI TgaDecoder_Frame_QueryInterface(IWICBitmapFrameDecode *iface, REFIID iid,
 434     void **ppv)
 435 {
 436     TRACE("(%p,%s,%p)\n", iface, debugstr_guid(iid), ppv);
 437
 438     if (!ppv) return E_INVALIDARG;
 439
 440     if (IsEqualIID(&IID_IUnknown, iid) ||
 441         IsEqualIID(&IID_IWICBitmapSource, iid) ||
 442         IsEqualIID(&IID_IWICBitmapFrameDecode, iid))
 443     {
 444         *ppv = iface;
 445     }
 446     else
 447     {
 448         *ppv = NULL;
 449         return E_NOINTERFACE;
 450     }
 451
 452     IUnknown_AddRef((IUnknown*)*ppv);
 453     return S_OK;
 454 }
 455
 456 static ULONG WINAPI TgaDecoder_Frame_AddRef(IWICBitmapFrameDecode *iface)
 457 {
 458     TgaDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 459     return IUnknown_AddRef((IUnknown*)This);
 460 }
 461
 462 static ULONG WINAPI TgaDecoder_Frame_Release(IWICBitmapFrameDecode *iface)
 463 {
 464     TgaDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 465     return IUnknown_Release((IUnknown*)This);
 466 }
 467
 468 static HRESULT WINAPI TgaDecoder_Frame_GetSize(IWICBitmapFrameDecode *iface,
 469     UINT *puiWidth, UINT *puiHeight)
 470 {
 471     TgaDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 472
 473     *puiWidth = This->header.width;
 474     *puiHeight = This->header.height;
 475
 476     TRACE("(%p)->(%u,%u)\n", iface, *puiWidth, *puiHeight);
 477
 478     return S_OK;
 479 }
 480
 481 static HRESULT WINAPI TgaDecoder_Frame_GetPixelFormat(IWICBitmapFrameDecode *iface,
 482     WICPixelFormatGUID *pPixelFormat)
 483 {
 484     TgaDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 485     int attribute_bitcount;
 486     byte attribute_type;
 487
 488     TRACE("(%p,%p)\n", iface, pPixelFormat);
 489
 490     attribute_bitcount = This->header.image_descriptor & IMAGE_ATTRIBUTE_BITCOUNT_MASK;
 491
 492     if (attribute_bitcount && This->extension_area_offset)
 493         attribute_type = This->extension_area.attributes_type;
 494     else if (attribute_bitcount)
 495         attribute_type = ATTRIBUTE_ALPHA;
 496     else
 497         attribute_type = ATTRIBUTE_NO_ALPHA;
 498
 499     switch (This->header.image_type & ~IMAGETYPE_RLE)
 500     {
 501     case IMAGETYPE_COLORMAPPED:
 502         switch (This->header.depth)
 503         {
 504         case 8:
 505             memcpy(pPixelFormat, &GUID_WICPixelFormat8bppIndexed, sizeof(GUID));
 506             break;
 507         default:
 508             FIXME("Unhandled indexed color depth %u\n", This->header.depth);
 509             return E_NOTIMPL;
 510         }
 511         break;
 512     case IMAGETYPE_TRUECOLOR:
 513         switch (This->header.depth)
 514         {
 515         case 16:
 516             switch (attribute_type)
 517             {
 518             case ATTRIBUTE_NO_ALPHA:
 519             case ATTRIBUTE_UNDEFINED:
 520             case ATTRIBUTE_UNDEFINED_PRESERVE:
 521                 memcpy(pPixelFormat, &GUID_WICPixelFormat16bppBGR555, sizeof(GUID));
 522                 break;
 523             case ATTRIBUTE_ALPHA:
 524             case ATTRIBUTE_PALPHA:
 525                 memcpy(pPixelFormat, &GUID_WICPixelFormat16bppBGRA5551, sizeof(GUID));
 526                 break;
 527             default:
 528                 FIXME("Unhandled 16-bit attribute type %u\n", attribute_type);
 529                 return E_NOTIMPL;
 530             }
 531             break;
 532         case 24:
 533             memcpy(pPixelFormat, &GUID_WICPixelFormat24bppBGR, sizeof(GUID));
 534             break;
 535         case 32:
 536             switch (attribute_type)
 537             {
 538             case ATTRIBUTE_NO_ALPHA:
 539             case ATTRIBUTE_UNDEFINED:
 540             case ATTRIBUTE_UNDEFINED_PRESERVE:
 541                 memcpy(pPixelFormat, &GUID_WICPixelFormat32bppBGR, sizeof(GUID));
 542                 break;
 543             case ATTRIBUTE_ALPHA:
 544                 memcpy(pPixelFormat, &GUID_WICPixelFormat32bppBGRA, sizeof(GUID));
 545                 break;
 546             case ATTRIBUTE_PALPHA:
 547                 memcpy(pPixelFormat, &GUID_WICPixelFormat32bppPBGRA, sizeof(GUID));
 548                 break;
 549             default:
 550                 FIXME("Unhandled 32-bit attribute type %u\n", attribute_type);
 551                 return E_NOTIMPL;
 552             }
 553             break;
 554         default:
 555             FIXME("Unhandled truecolor depth %u\n", This->header.depth);
 556             return E_NOTIMPL;
 557         }
 558         break;
 559     case IMAGETYPE_GRAYSCALE:
 560         switch (This->header.depth)
 561         {
 562         case 8:
 563             memcpy(pPixelFormat, &GUID_WICPixelFormat8bppGray, sizeof(GUID));
 564             break;
 565         case 16:
 566             memcpy(pPixelFormat, &GUID_WICPixelFormat16bppGray, sizeof(GUID));
 567             break;
 568         default:
 569             FIXME("Unhandled grayscale depth %u\n", This->header.depth);
 570             return E_NOTIMPL;
 571         }
 572         break;
 573     default:
 574         ERR("Unknown image type %u\n", This->header.image_type);
 575         return E_FAIL;
 576     }
 577
 578     return S_OK;
 579 }
 580
 581 static HRESULT WINAPI TgaDecoder_Frame_GetResolution(IWICBitmapFrameDecode *iface,
 582     double *pDpiX, double *pDpiY)
 583 {
 584     FIXME("(%p,%p,%p): stub\n", iface, pDpiX, pDpiY);
 585     return E_NOTIMPL;
 586 }
 587
 588 static HRESULT WINAPI TgaDecoder_Frame_CopyPalette(IWICBitmapFrameDecode *iface,
 589     IWICPalette *pIPalette)
 590 {
 591     TgaDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 592     HRESULT hr=S_OK;
 593     WICColor colors[256], *color;
 594     BYTE *colormap_data;
 595     WORD *wcolormap_data;
 596     DWORD *dwcolormap_data;
 597     LARGE_INTEGER seek;
 598     ULONG bytesread;
 599     int depth, attribute_bitcount, attribute_type;
 600     int i;
 601
 602     TRACE("(%p,%p)\n", iface, pIPalette);
 603
 604     if (!This->colormap_length)
 605     {
 606         WARN("no colormap present in this file\n");
 607         return WINCODEC_ERR_PALETTEUNAVAILABLE;
 608     }
 609
 610     if (This->header.colormap_firstentry + This->header.colormap_length > 256)
 611     {
 612         FIXME("cannot read colormap with %i entries starting at %i\n",
 613             This->header.colormap_firstentry + This->header.colormap_length,
 614             This->header.colormap_firstentry);
 615         return E_FAIL;
 616     }
 617
 618     colormap_data = HeapAlloc(GetProcessHeap(), 0, This->colormap_length);
 619     if (!colormap_data) return E_OUTOFMEMORY;
 620
 621     wcolormap_data = (WORD*)colormap_data;
 622     dwcolormap_data = (DWORD*)colormap_data;
 623
 624     EnterCriticalSection(&This->lock);
 625
 626     seek.QuadPart = This->colormap_offset;
 627     hr = IStream_Seek(This->stream, seek, STREAM_SEEK_SET, NULL);
 628
 629     if (SUCCEEDED(hr))
 630     {
 631         hr = IStream_Read(This->stream, colormap_data, This->colormap_length, &bytesread);
 632         if (SUCCEEDED(hr) && bytesread != This->colormap_length)
 633         {
 634             WARN("expected %i bytes in colormap, got %i\n", This->colormap_length, bytesread);
 635             hr = E_FAIL;
 636         }
 637     }
 638
 639     LeaveCriticalSection(&This->lock);
 640
 641     if (SUCCEEDED(hr))
 642     {
 643         attribute_bitcount = This->header.image_descriptor & IMAGE_ATTRIBUTE_BITCOUNT_MASK;
 644
 645         if (attribute_bitcount && This->extension_area_offset)
 646             attribute_type = This->extension_area.attributes_type;
 647         else if (attribute_bitcount)
 648             attribute_type = ATTRIBUTE_ALPHA;
 649         else
 650             attribute_type = ATTRIBUTE_NO_ALPHA;
 651
 652         depth = This->header.colormap_entrysize;
 653         if (depth == 15)
 654         {
 655             depth = 16;
 656             attribute_type = ATTRIBUTE_NO_ALPHA;
 657         }
 658
 659         memset(colors, 0, sizeof(colors));
 660
 661         color = &colors[This->header.colormap_firstentry];
 662
 663         /* Colormap entries can be in any truecolor format, and we have to convert them. */
 664         switch (depth)
 665         {
 666         case 16:
 667             switch (attribute_type)
 668             {
 669             case ATTRIBUTE_NO_ALPHA:
 670             case ATTRIBUTE_UNDEFINED:
 671             case ATTRIBUTE_UNDEFINED_PRESERVE:
 672                 for (i=0; i<This->header.colormap_length; i++)
 673                 {
 674                     WORD srcval = wcolormap_data[i];
 675                     *color++=0xff000000 | /* constant 255 alpha */
 676                              ((srcval << 9) & 0xf80000) | /* r */
 677                              ((srcval << 4) & 0x070000) | /* r - 3 bits */
 678                              ((srcval << 6) & 0x00f800) | /* g */
 679                              ((srcval << 1) & 0x000700) | /* g - 3 bits */
 680                              ((srcval << 3) & 0x0000f8) | /* b */
 681                              ((srcval >> 2) & 0x000007);  /* b - 3 bits */
 682                 }
 683                 break;
 684             case ATTRIBUTE_ALPHA:
 685             case ATTRIBUTE_PALPHA:
 686                 for (i=0; i<This->header.colormap_length; i++)
 687                 {
 688                     WORD srcval = wcolormap_data[i];
 689                     *color++=((srcval & 0x8000) ? 0xff000000 : 0) | /* alpha */
 690                              ((srcval << 9) & 0xf80000) | /* r */
 691                              ((srcval << 4) & 0x070000) | /* r - 3 bits */
 692                              ((srcval << 6) & 0x00f800) | /* g */
 693                              ((srcval << 1) & 0x000700) | /* g - 3 bits */
 694                              ((srcval << 3) & 0x0000f8) | /* b */
 695                              ((srcval >> 2) & 0x000007);  /* b - 3 bits */
 696                 }
 697                 break;
 698             default:
 699                 FIXME("Unhandled 16-bit attribute type %u\n", attribute_type);
 700                 hr = E_NOTIMPL;
 701             }
 702             break;
 703         case 24:
 704             for (i=0; i<This->header.colormap_length; i++)
 705             {
 706                 *color++=0xff000000 | /* alpha */
 707                          colormap_data[i*3+2] | /* red */
 708                          colormap_data[i*3+1] | /* green */
 709                          colormap_data[i*3]; /* blue */
 710             }
 711             break;
 712         case 32:
 713             switch (attribute_type)
 714             {
 715             case ATTRIBUTE_NO_ALPHA:
 716             case ATTRIBUTE_UNDEFINED:
 717             case ATTRIBUTE_UNDEFINED_PRESERVE:
 718                 for (i=0; i<This->header.colormap_length; i++)
 719                     *color++=dwcolormap_data[i]|0xff000000;
 720                 break;
 721             case ATTRIBUTE_ALPHA:
 722                 for (i=0; i<This->header.colormap_length; i++)
 723                     *color++=dwcolormap_data[i];
 724                 break;
 725             case ATTRIBUTE_PALPHA:
 726                 /* FIXME: Unpremultiply alpha */
 727             default:
 728                 FIXME("Unhandled 16-bit attribute type %u\n", attribute_type);
 729                 hr = E_NOTIMPL;
 730             }
 731             break;
 732         default:
 733             FIXME("Unhandled truecolor depth %u\n", This->header.depth);
 734             hr = E_NOTIMPL;
 735         }
 736     }
 737
 738     HeapFree(GetProcessHeap(), 0, colormap_data);
 739
 740     if (SUCCEEDED(hr))
 741         hr = IWICPalette_InitializeCustom(pIPalette, colors, 256);
 742
 743     return hr;
 744 }
 745
 746 static HRESULT TgaDecoder_ReadRLE(TgaDecoder *This, BYTE *imagebits, int datasize)
 747 {
 748     int i=0, j, bytesperpixel;
 749     ULONG bytesread;
 750     HRESULT hr=S_OK;
 751
 752     bytesperpixel = This->header.depth / 8;
 753
 754     while (i<datasize)
 755     {
 756         BYTE rc;
 757         int count, size;
 758         BYTE pixeldata[4];
 759
 760         hr = IStream_Read(This->stream, &rc, 1, &bytesread);
 761         if (bytesread != 1) hr = E_FAIL;
 762         if (FAILED(hr)) break;
 763
 764         count = (rc&0x7f)+1;
 765         size = count * bytesperpixel;
 766
 767         if (size + i > datasize)
 768         {
 769             WARN("RLE packet too large\n");
 770             hr = E_FAIL;
 771             break;
 772         }
 773
 774         if (rc&0x80)
 775         {
 776             /* Run-length packet */
 777             hr = IStream_Read(This->stream, pixeldata, bytesperpixel, &bytesread);
 778             if (bytesread != bytesperpixel) hr = E_FAIL;
 779             if (FAILED(hr)) break;
 780
 781             if (bytesperpixel == 1)
 782                 memset(&imagebits[i], pixeldata[0], count);
 783             else
 784             {
 785                 for (j=0; j<count; j++)
 786                     memcpy(&imagebits[i+j*bytesperpixel], pixeldata, bytesperpixel);
 787             }
 788         }
 789         else
 790         {
 791             /* Raw packet */
 792             hr = IStream_Read(This->stream, &imagebits[i], size, &bytesread);
 793             if (bytesread != size) hr = E_FAIL;
 794             if (FAILED(hr)) break;
 795         }
 796
 797         i += size;
 798     }
 799
 800     return hr;
 801 }
 802
 803 static HRESULT TgaDecoder_ReadImage(TgaDecoder *This)
 804 {
 805     HRESULT hr=S_OK;
 806     int datasize;
 807     LARGE_INTEGER seek;
 808     ULONG bytesread;
 809
 810     if (This->imagebits)
 811         return S_OK;
 812
 813     EnterCriticalSection(&This->lock);
 814
 815     if (!This->imagebits)
 816     {
 817         if (This->header.image_descriptor & IMAGE_RIGHTTOLEFT)
 818         {
 819             FIXME("Right to left image reading not implemented\n");
 820             hr = E_NOTIMPL;
 821         }
 822
 823         if (SUCCEEDED(hr))
 824         {
 825             datasize = This->header.width * This->header.height * (This->header.depth / 8);
 826             This->imagebits = HeapAlloc(GetProcessHeap(), 0, datasize);
 827             if (!This->imagebits) hr = E_OUTOFMEMORY;
 828         }
 829
 830         if (SUCCEEDED(hr))
 831         {
 832             seek.QuadPart = This->image_offset;
 833             hr = IStream_Seek(This->stream, seek, STREAM_SEEK_SET, NULL);
 834         }
 835
 836         if (SUCCEEDED(hr))
 837         {
 838             if (This->header.image_type & IMAGETYPE_RLE)
 839             {
 840                 hr = TgaDecoder_ReadRLE(This, This->imagebits, datasize);
 841             }
 842             else
 843             {
 844                 hr = IStream_Read(This->stream, This->imagebits, datasize, &bytesread);
 845                 if (SUCCEEDED(hr) && bytesread != datasize)
 846                     hr = E_FAIL;
 847             }
 848         }
 849
 850         if (SUCCEEDED(hr))
 851         {
 852             if (This->header.image_descriptor & IMAGE_TOPTOBOTTOM)
 853             {
 854                 This->origin = This->imagebits;
 855                 This->stride = This->header.width * (This->header.depth / 8);
 856             }
 857             else
 858             {
 859                 This->stride = -This->header.width * (This->header.depth / 8);
 860                 This->origin = This->imagebits + This->header.width * (This->header.height - 1) * (This->header.depth / 8);
 861             }
 862         }
 863         else
 864         {
 865             HeapFree(GetProcessHeap(), 0, This->imagebits);
 866             This->imagebits = NULL;
 867         }
 868     }
 869
 870     LeaveCriticalSection(&This->lock);
 871
 872     return hr;
 873 }
 874
 875 static HRESULT WINAPI TgaDecoder_Frame_CopyPixels(IWICBitmapFrameDecode *iface,
 876     const WICRect *prc, UINT cbStride, UINT cbBufferSize, BYTE *pbBuffer)
 877 {
 878     TgaDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 879     HRESULT hr;
 880
 881     TRACE("(%p,%p,%u,%u,%p)\n", iface, prc, cbStride, cbBufferSize, pbBuffer);
 882
 883     hr = TgaDecoder_ReadImage(This);
 884
 885     if (SUCCEEDED(hr))
 886     {
 887         hr = copy_pixels(This->header.depth, This->origin,
 888             This->header.width, This->header.height, This->stride,
 889             prc, cbStride, cbBufferSize, pbBuffer);
 890     }
 891
 892     return hr;
 893 }
 894
 895 static HRESULT WINAPI TgaDecoder_Frame_GetMetadataQueryReader(IWICBitmapFrameDecode *iface,
 896     IWICMetadataQueryReader **ppIMetadataQueryReader)
 897 {
 898     FIXME("(%p,%p): stub\n", iface, ppIMetadataQueryReader);
 899     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 900 }
 901
 902 static HRESULT WINAPI TgaDecoder_Frame_GetColorContexts(IWICBitmapFrameDecode *iface,
 903     UINT cCount, IWICColorContext **ppIColorContexts, UINT *pcActualCount)
 904 {
 905     FIXME("(%p,%u,%p,%p): stub\n", iface, cCount, ppIColorContexts, pcActualCount);
 906     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 907 }
 908
 909 static HRESULT WINAPI TgaDecoder_Frame_GetThumbnail(IWICBitmapFrameDecode *iface,
 910     IWICBitmapSource **ppIThumbnail)
 911 {
 912     FIXME("(%p,%p): stub\n", iface, ppIThumbnail);
 913     return WINCODEC_ERR_CODECNOTHUMBNAIL;
 914 }
 915
 916 static const IWICBitmapFrameDecodeVtbl TgaDecoder_Frame_Vtbl = {
 917     TgaDecoder_Frame_QueryInterface,
 918     TgaDecoder_Frame_AddRef,
 919     TgaDecoder_Frame_Release,
 920     TgaDecoder_Frame_GetSize,
 921     TgaDecoder_Frame_GetPixelFormat,
 922     TgaDecoder_Frame_GetResolution,
 923     TgaDecoder_Frame_CopyPalette,
 924     TgaDecoder_Frame_CopyPixels,
 925     TgaDecoder_Frame_GetMetadataQueryReader,
 926     TgaDecoder_Frame_GetColorContexts,
 927     TgaDecoder_Frame_GetThumbnail
 928 };
 929
 930 HRESULT TgaDecoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv)
 931 {
 932     TgaDecoder *This;
 933     HRESULT ret;
 934
 935     TRACE("(%p,%s,%p)\n", pUnkOuter, debugstr_guid(iid), ppv);
 936
 937     *ppv = NULL;
 938
 939     if (pUnkOuter) return CLASS_E_NOAGGREGATION;
 940
 941     This = HeapAlloc(GetProcessHeap(), 0, sizeof(TgaDecoder));
 942     if (!This) return E_OUTOFMEMORY;
 943
 944     This->IWICBitmapDecoder_iface.lpVtbl = &TgaDecoder_Vtbl;
 945     This->IWICBitmapFrameDecode_iface.lpVtbl = &TgaDecoder_Frame_Vtbl;
 946     This->ref = 1;
 947     This->initialized = FALSE;
 948     This->stream = NULL;
 949     This->imagebits = NULL;
 950     InitializeCriticalSection(&This->lock);
 951     This->lock.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": TgaDecoder.lock");
 952
 953     ret = IUnknown_QueryInterface((IUnknown*)This, iid, ppv);
 954     IUnknown_Release((IUnknown*)This);
 955
 956     return ret;
 957 }