git.oblomov.eu Git - wine/blob - dlls/windowscodecs/icoformat.c

   1 /*
   2  * Copyright 2009 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
  21 #include <stdarg.h>
  22
  23 #define COBJMACROS
  24
  25 #include "windef.h"
  26 #include "winbase.h"
  27 #include "wingdi.h"
  28 #include "objbase.h"
  29 #include "wincodec.h"
  30
  31 #include "wincodecs_private.h"
  32
  33 #include "wine/debug.h"
  34
  35 WINE_DEFAULT_DEBUG_CHANNEL(wincodecs);
  36
  37 #include "pshpack1.h"
  38
  39 typedef struct {
  40     BYTE bWidth;
  41     BYTE bHeight;
  42     BYTE bColorCount;
  43     BYTE bReserved;
  44     WORD wPlanes;
  45     WORD wBitCount;
  46     DWORD dwDIBSize;
  47     DWORD dwDIBOffset;
  48 } ICONDIRENTRY;
  49
  50 typedef struct
  51 {
  52     WORD idReserved;
  53     WORD idType;
  54     WORD idCount;
  55 } ICONHEADER;
  56
  57 #include "poppack.h"
  58
  59 typedef struct {
  60     IWICBitmapDecoder IWICBitmapDecoder_iface;
  61     LONG ref;
  62     BOOL initialized;
  63     IStream *stream;
  64     ICONHEADER header;
  65     CRITICAL_SECTION lock; /* must be held when accessing stream */
  66 } IcoDecoder;
  67
  68 typedef struct {
  69     IWICBitmapFrameDecode IWICBitmapFrameDecode_iface;
  70     LONG ref;
  71     UINT width, height;
  72     BYTE *bits;
  73 } IcoFrameDecode;
  74
  75 static inline IcoDecoder *impl_from_IWICBitmapDecoder(IWICBitmapDecoder *iface)
  76 {
  77     return CONTAINING_RECORD(iface, IcoDecoder, IWICBitmapDecoder_iface);
  78 }
  79
  80 static inline IcoFrameDecode *impl_from_IWICBitmapFrameDecode(IWICBitmapFrameDecode *iface)
  81 {
  82     return CONTAINING_RECORD(iface, IcoFrameDecode, IWICBitmapFrameDecode_iface);
  83 }
  84
  85 static HRESULT WINAPI IcoFrameDecode_QueryInterface(IWICBitmapFrameDecode *iface, REFIID iid,
  86     void **ppv)
  87 {
  88     IcoFrameDecode *This = impl_from_IWICBitmapFrameDecode(iface);
  89     TRACE("(%p,%s,%p)\n", iface, debugstr_guid(iid), ppv);
  90
  91     if (!ppv) return E_INVALIDARG;
  92
  93     if (IsEqualIID(&IID_IUnknown, iid) ||
  94         IsEqualIID(&IID_IWICBitmapSource, iid) ||
  95         IsEqualIID(&IID_IWICBitmapFrameDecode, iid))
  96     {
  97         *ppv = This;
  98     }
  99     else
 100     {
 101         *ppv = NULL;
 102         return E_NOINTERFACE;
 103     }
 104
 105     IUnknown_AddRef((IUnknown*)*ppv);
 106     return S_OK;
 107 }
 108
 109 static ULONG WINAPI IcoFrameDecode_AddRef(IWICBitmapFrameDecode *iface)
 110 {
 111     IcoFrameDecode *This = impl_from_IWICBitmapFrameDecode(iface);
 112     ULONG ref = InterlockedIncrement(&This->ref);
 113
 114     TRACE("(%p) refcount=%u\n", iface, ref);
 115
 116     return ref;
 117 }
 118
 119 static ULONG WINAPI IcoFrameDecode_Release(IWICBitmapFrameDecode *iface)
 120 {
 121     IcoFrameDecode *This = impl_from_IWICBitmapFrameDecode(iface);
 122     ULONG ref = InterlockedDecrement(&This->ref);
 123
 124     TRACE("(%p) refcount=%u\n", iface, ref);
 125
 126     if (ref == 0)
 127     {
 128         HeapFree(GetProcessHeap(), 0, This->bits);
 129         HeapFree(GetProcessHeap(), 0, This);
 130     }
 131
 132     return ref;
 133 }
 134
 135 static HRESULT WINAPI IcoFrameDecode_GetSize(IWICBitmapFrameDecode *iface,
 136     UINT *puiWidth, UINT *puiHeight)
 137 {
 138     IcoFrameDecode *This = impl_from_IWICBitmapFrameDecode(iface);
 139
 140     *puiWidth = This->width;
 141     *puiHeight = This->height;
 142
 143     TRACE("(%p) -> (%i,%i)\n", iface, *puiWidth, *puiHeight);
 144
 145     return S_OK;
 146 }
 147
 148 static HRESULT WINAPI IcoFrameDecode_GetPixelFormat(IWICBitmapFrameDecode *iface,
 149     WICPixelFormatGUID *pPixelFormat)
 150 {
 151     memcpy(pPixelFormat, &GUID_WICPixelFormat32bppBGRA, sizeof(GUID));
 152     return S_OK;
 153 }
 154
 155 static HRESULT WINAPI IcoFrameDecode_GetResolution(IWICBitmapFrameDecode *iface,
 156     double *pDpiX, double *pDpiY)
 157 {
 158     FIXME("(%p,%p,%p): stub\n", iface, pDpiX, pDpiY);
 159     return E_NOTIMPL;
 160 }
 161
 162 static HRESULT WINAPI IcoFrameDecode_CopyPalette(IWICBitmapFrameDecode *iface,
 163     IWICPalette *pIPalette)
 164 {
 165     TRACE("(%p,%p)\n", iface, pIPalette);
 166     return WINCODEC_ERR_PALETTEUNAVAILABLE;
 167 }
 168
 169 static HRESULT WINAPI IcoFrameDecode_CopyPixels(IWICBitmapFrameDecode *iface,
 170     const WICRect *prc, UINT cbStride, UINT cbBufferSize, BYTE *pbBuffer)
 171 {
 172     IcoFrameDecode *This = impl_from_IWICBitmapFrameDecode(iface);
 173     TRACE("(%p,%p,%u,%u,%p)\n", iface, prc, cbStride, cbBufferSize, pbBuffer);
 174
 175     return copy_pixels(32, This->bits, This->width, This->height, This->width * 4,
 176         prc, cbStride, cbBufferSize, pbBuffer);
 177 }
 178
 179 static HRESULT WINAPI IcoFrameDecode_GetMetadataQueryReader(IWICBitmapFrameDecode *iface,
 180     IWICMetadataQueryReader **ppIMetadataQueryReader)
 181 {
 182     TRACE("(%p,%p)\n", iface, ppIMetadataQueryReader);
 183     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 184 }
 185
 186 static HRESULT WINAPI IcoFrameDecode_GetColorContexts(IWICBitmapFrameDecode *iface,
 187     UINT cCount, IWICColorContext **ppIColorContexts, UINT *pcActualCount)
 188 {
 189     TRACE("(%p,%u,%p,%p)\n", iface, cCount, ppIColorContexts, pcActualCount);
 190     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 191 }
 192
 193 static HRESULT WINAPI IcoFrameDecode_GetThumbnail(IWICBitmapFrameDecode *iface,
 194     IWICBitmapSource **ppIThumbnail)
 195 {
 196     TRACE("(%p,%p)\n", iface, ppIThumbnail);
 197     return WINCODEC_ERR_CODECNOTHUMBNAIL;
 198 }
 199
 200 static const IWICBitmapFrameDecodeVtbl IcoFrameDecode_Vtbl = {
 201     IcoFrameDecode_QueryInterface,
 202     IcoFrameDecode_AddRef,
 203     IcoFrameDecode_Release,
 204     IcoFrameDecode_GetSize,
 205     IcoFrameDecode_GetPixelFormat,
 206     IcoFrameDecode_GetResolution,
 207     IcoFrameDecode_CopyPalette,
 208     IcoFrameDecode_CopyPixels,
 209     IcoFrameDecode_GetMetadataQueryReader,
 210     IcoFrameDecode_GetColorContexts,
 211     IcoFrameDecode_GetThumbnail
 212 };
 213
 214 static inline void pixel_set_trans(DWORD* pixel, BOOL transparent)
 215 {
 216     if (transparent) *pixel = 0;
 217     else *pixel |= 0xff000000;
 218 }
 219
 220 static HRESULT ReadIcoDib(IStream *stream, IcoFrameDecode *result)
 221 {
 222     HRESULT hr;
 223     IWICBitmapDecoder *decoder;
 224     IWICBitmapFrameDecode *framedecode;
 225     WICPixelFormatGUID pixelformat;
 226     IWICBitmapSource *source;
 227     int has_alpha=FALSE; /* if TRUE, alpha data might be in the image data */
 228     WICRect rc;
 229
 230     hr = IcoDibDecoder_CreateInstance(NULL, &IID_IWICBitmapDecoder, (void**)&decoder);
 231     if (SUCCEEDED(hr))
 232     {
 233         hr = IWICBitmapDecoder_Initialize(decoder, stream, WICDecodeMetadataCacheOnLoad);
 234
 235         if (SUCCEEDED(hr))
 236             hr = IWICBitmapDecoder_GetFrame(decoder, 0, &framedecode);
 237
 238         if (SUCCEEDED(hr))
 239         {
 240             hr = IWICBitmapFrameDecode_GetSize(framedecode, &result->width, &result->height);
 241
 242             if (SUCCEEDED(hr))
 243             {
 244                 result->bits = HeapAlloc(GetProcessHeap(), 0, result->width * result->height * 4);
 245                 if (!result->bits) hr = E_OUTOFMEMORY;
 246             }
 247
 248             if (SUCCEEDED(hr))
 249                 hr = IWICBitmapFrameDecode_GetPixelFormat(framedecode, &pixelformat);
 250
 251             if (IsEqualGUID(&pixelformat, &GUID_WICPixelFormat32bppBGR) ||
 252                 IsEqualGUID(&pixelformat, &GUID_WICPixelFormat32bppBGRA))
 253             {
 254                 source = (IWICBitmapSource*)framedecode;
 255                 IWICBitmapSource_AddRef(source);
 256                 has_alpha = TRUE;
 257             }
 258             else
 259             {
 260                 hr = WICConvertBitmapSource(&GUID_WICPixelFormat32bppBGRA,
 261                     (IWICBitmapSource*)framedecode, &source);
 262                 has_alpha = FALSE;
 263             }
 264
 265             if (SUCCEEDED(hr))
 266             {
 267                 rc.X = 0;
 268                 rc.Y = 0;
 269                 rc.Width = result->width;
 270                 rc.Height = result->height;
 271                 hr = IWICBitmapSource_CopyPixels(source, &rc, result->width * 4,
 272                     result->width * result->height * 4, result->bits);
 273
 274                 IWICBitmapSource_Release(source);
 275             }
 276
 277             IWICBitmapFrameDecode_Release(framedecode);
 278         }
 279
 280         if (SUCCEEDED(hr) && !has_alpha)
 281         {
 282             /* set alpha data based on the AND mask */
 283             UINT andBytesPerRow = (result->width+31)/32*4;
 284             UINT andBytes = andBytesPerRow * result->height;
 285             INT andStride;
 286             BYTE *tempdata=NULL;
 287             BYTE *andRow;
 288             BYTE *bitsRow;
 289             UINT bitsStride = result->width * 4;
 290             UINT x, y;
 291             ULONG offset;
 292             ULONG bytesread;
 293             LARGE_INTEGER seek;
 294             int topdown;
 295
 296             BmpDecoder_FindIconMask(decoder, &offset, &topdown);
 297
 298             if (offset)
 299             {
 300                 seek.QuadPart = offset;
 301
 302                 hr = IStream_Seek(stream, seek, STREAM_SEEK_SET, 0);
 303
 304                 if (SUCCEEDED(hr))
 305                 {
 306                     tempdata = HeapAlloc(GetProcessHeap(), 0, andBytes);
 307                     if (!tempdata) hr = E_OUTOFMEMORY;
 308                 }
 309
 310                 if (SUCCEEDED(hr))
 311                     hr = IStream_Read(stream, tempdata, andBytes, &bytesread);
 312
 313                 if (SUCCEEDED(hr) && bytesread == andBytes)
 314                 {
 315                     if (topdown)
 316                     {
 317                         andStride = andBytesPerRow;
 318                         andRow = tempdata;
 319                     }
 320                     else
 321                     {
 322                         andStride = -andBytesPerRow;
 323                         andRow = tempdata + (result->height-1)*andBytesPerRow;
 324                     }
 325
 326                     bitsRow = result->bits;
 327                     for (y=0; y<result->height; y++) {
 328                         BYTE *andByte=andRow;
 329                         DWORD *bitsPixel=(DWORD*)bitsRow;
 330                         for (x=0; x<result->width; x+=8) {
 331                             BYTE andVal=*andByte++;
 332                             pixel_set_trans(bitsPixel++, andVal>>7&1);
 333                             if (x+1 < result->width) pixel_set_trans(bitsPixel++, andVal>>6&1);
 334                             if (x+2 < result->width) pixel_set_trans(bitsPixel++, andVal>>5&1);
 335                             if (x+3 < result->width) pixel_set_trans(bitsPixel++, andVal>>4&1);
 336                             if (x+4 < result->width) pixel_set_trans(bitsPixel++, andVal>>3&1);
 337                             if (x+5 < result->width) pixel_set_trans(bitsPixel++, andVal>>2&1);
 338                             if (x+6 < result->width) pixel_set_trans(bitsPixel++, andVal>>1&1);
 339                             if (x+7 < result->width) pixel_set_trans(bitsPixel++, andVal&1);
 340                         }
 341                         andRow += andStride;
 342                         bitsRow += bitsStride;
 343                     }
 344                 }
 345
 346                 HeapFree(GetProcessHeap(), 0, tempdata);
 347             }
 348         }
 349
 350         IWICBitmapDecoder_Release(decoder);
 351     }
 352
 353     return hr;
 354 }
 355
 356 static HRESULT ReadIcoPng(IStream *stream, IcoFrameDecode *result)
 357 {
 358     IWICBitmapDecoder *decoder = NULL;
 359     IWICBitmapFrameDecode *sourceFrame = NULL;
 360     IWICBitmapSource *sourceBitmap = NULL;
 361     WICRect rect;
 362     HRESULT hr;
 363
 364     hr = PngDecoder_CreateInstance(NULL, &IID_IWICBitmapDecoder, (void**)&decoder);
 365     if (FAILED(hr))
 366         goto end;
 367     hr = IWICBitmapDecoder_Initialize(decoder, stream, WICDecodeMetadataCacheOnLoad);
 368     if (FAILED(hr))
 369         goto end;
 370     hr = IWICBitmapDecoder_GetFrame(decoder, 0, &sourceFrame);
 371     if (FAILED(hr))
 372         goto end;
 373     hr = WICConvertBitmapSource(&GUID_WICPixelFormat32bppBGRA, (IWICBitmapSource*)sourceFrame, &sourceBitmap);
 374     if (FAILED(hr))
 375         goto end;
 376     hr = IWICBitmapFrameDecode_GetSize(sourceFrame, &result->width, &result->height);
 377     if (FAILED(hr))
 378         goto end;
 379     result->bits = HeapAlloc(GetProcessHeap(), 0, 4 * result->width * result->height);
 380     if (result->bits == NULL)
 381     {
 382         hr = E_OUTOFMEMORY;
 383         goto end;
 384     }
 385     rect.X = 0;
 386     rect.Y = 0;
 387     rect.Width = result->width;
 388     rect.Height = result->height;
 389     hr = IWICBitmapSource_CopyPixels(sourceBitmap, &rect, 4*result->width,
 390                                      4*result->width*result->height, result->bits);
 391
 392 end:
 393     if (decoder != NULL)
 394         IWICBitmapDecoder_Release(decoder);
 395     if (sourceFrame != NULL)
 396         IWICBitmapFrameDecode_Release(sourceFrame);
 397     if (sourceBitmap != NULL)
 398         IWICBitmapSource_Release(sourceBitmap);
 399     return hr;
 400 }
 401
 402 static HRESULT WINAPI IcoDecoder_QueryInterface(IWICBitmapDecoder *iface, REFIID iid,
 403     void **ppv)
 404 {
 405     IcoDecoder *This = impl_from_IWICBitmapDecoder(iface);
 406     TRACE("(%p,%s,%p)\n", iface, debugstr_guid(iid), ppv);
 407
 408     if (!ppv) return E_INVALIDARG;
 409
 410     if (IsEqualIID(&IID_IUnknown, iid) || IsEqualIID(&IID_IWICBitmapDecoder, iid))
 411     {
 412         *ppv = This;
 413     }
 414     else
 415     {
 416         *ppv = NULL;
 417         return E_NOINTERFACE;
 418     }
 419
 420     IUnknown_AddRef((IUnknown*)*ppv);
 421     return S_OK;
 422 }
 423
 424 static ULONG WINAPI IcoDecoder_AddRef(IWICBitmapDecoder *iface)
 425 {
 426     IcoDecoder *This = impl_from_IWICBitmapDecoder(iface);
 427     ULONG ref = InterlockedIncrement(&This->ref);
 428
 429     TRACE("(%p) refcount=%u\n", iface, ref);
 430
 431     return ref;
 432 }
 433
 434 static ULONG WINAPI IcoDecoder_Release(IWICBitmapDecoder *iface)
 435 {
 436     IcoDecoder *This = impl_from_IWICBitmapDecoder(iface);
 437     ULONG ref = InterlockedDecrement(&This->ref);
 438
 439     TRACE("(%p) refcount=%u\n", iface, ref);
 440
 441     if (ref == 0)
 442     {
 443         This->lock.DebugInfo->Spare[0] = 0;
 444         DeleteCriticalSection(&This->lock);
 445         if (This->stream) IStream_Release(This->stream);
 446         HeapFree(GetProcessHeap(), 0, This);
 447     }
 448
 449     return ref;
 450 }
 451
 452 static HRESULT WINAPI IcoDecoder_QueryCapability(IWICBitmapDecoder *iface, IStream *pIStream,
 453     DWORD *pdwCapability)
 454 {
 455     FIXME("(%p,%p,%p): stub\n", iface, pIStream, pdwCapability);
 456     return E_NOTIMPL;
 457 }
 458
 459 static HRESULT WINAPI IcoDecoder_Initialize(IWICBitmapDecoder *iface, IStream *pIStream,
 460     WICDecodeOptions cacheOptions)
 461 {
 462     IcoDecoder *This = impl_from_IWICBitmapDecoder(iface);
 463     LARGE_INTEGER seek;
 464     HRESULT hr;
 465     ULONG bytesread;
 466     TRACE("(%p,%p,%x)\n", iface, pIStream, cacheOptions);
 467
 468     EnterCriticalSection(&This->lock);
 469
 470     if (This->initialized)
 471     {
 472         hr = WINCODEC_ERR_WRONGSTATE;
 473         goto end;
 474     }
 475
 476     seek.QuadPart = 0;
 477     hr = IStream_Seek(pIStream, seek, STREAM_SEEK_SET, NULL);
 478     if (FAILED(hr)) goto end;
 479
 480     hr = IStream_Read(pIStream, &This->header, sizeof(ICONHEADER), &bytesread);
 481     if (FAILED(hr)) goto end;
 482     if (bytesread != sizeof(ICONHEADER) ||
 483         This->header.idReserved != 0 ||
 484         This->header.idType != 1)
 485     {
 486         hr = E_FAIL;
 487         goto end;
 488     }
 489
 490     This->initialized = TRUE;
 491     This->stream = pIStream;
 492     IStream_AddRef(pIStream);
 493
 494 end:
 495
 496     LeaveCriticalSection(&This->lock);
 497
 498     return hr;
 499 }
 500
 501 static HRESULT WINAPI IcoDecoder_GetContainerFormat(IWICBitmapDecoder *iface,
 502     GUID *pguidContainerFormat)
 503 {
 504     FIXME("(%p,%p): stub\n", iface, pguidContainerFormat);
 505     return E_NOTIMPL;
 506 }
 507
 508 static HRESULT WINAPI IcoDecoder_GetDecoderInfo(IWICBitmapDecoder *iface,
 509     IWICBitmapDecoderInfo **ppIDecoderInfo)
 510 {
 511     FIXME("(%p,%p): stub\n", iface, ppIDecoderInfo);
 512     return E_NOTIMPL;
 513 }
 514
 515 static HRESULT WINAPI IcoDecoder_CopyPalette(IWICBitmapDecoder *iface,
 516     IWICPalette *pIPalette)
 517 {
 518     TRACE("(%p,%p)\n", iface, pIPalette);
 519     return WINCODEC_ERR_PALETTEUNAVAILABLE;
 520 }
 521
 522 static HRESULT WINAPI IcoDecoder_GetMetadataQueryReader(IWICBitmapDecoder *iface,
 523     IWICMetadataQueryReader **ppIMetadataQueryReader)
 524 {
 525     TRACE("(%p,%p)\n", iface, ppIMetadataQueryReader);
 526     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 527 }
 528
 529 static HRESULT WINAPI IcoDecoder_GetPreview(IWICBitmapDecoder *iface,
 530     IWICBitmapSource **ppIBitmapSource)
 531 {
 532     TRACE("(%p,%p)\n", iface, ppIBitmapSource);
 533     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 534 }
 535
 536 static HRESULT WINAPI IcoDecoder_GetColorContexts(IWICBitmapDecoder *iface,
 537     UINT cCount, IWICColorContext **ppIColorContexts, UINT *pcActualCount)
 538 {
 539     TRACE("(%p,%u,%p,%p)\n", iface, cCount, ppIColorContexts, pcActualCount);
 540     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 541 }
 542
 543 static HRESULT WINAPI IcoDecoder_GetThumbnail(IWICBitmapDecoder *iface,
 544     IWICBitmapSource **ppIThumbnail)
 545 {
 546     TRACE("(%p,%p)\n", iface, ppIThumbnail);
 547     return WINCODEC_ERR_CODECNOTHUMBNAIL;
 548 }
 549
 550 static HRESULT WINAPI IcoDecoder_GetFrameCount(IWICBitmapDecoder *iface,
 551     UINT *pCount)
 552 {
 553     IcoDecoder *This = impl_from_IWICBitmapDecoder(iface);
 554     TRACE("(%p,%p)\n", iface, pCount);
 555
 556     if (!This->initialized) return WINCODEC_ERR_NOTINITIALIZED;
 557
 558     *pCount = This->header.idCount;
 559     TRACE("<-- %u\n", *pCount);
 560
 561     return S_OK;
 562 }
 563
 564 static HRESULT WINAPI IcoDecoder_GetFrame(IWICBitmapDecoder *iface,
 565     UINT index, IWICBitmapFrameDecode **ppIBitmapFrame)
 566 {
 567     IcoDecoder *This = impl_from_IWICBitmapDecoder(iface);
 568     IcoFrameDecode *result=NULL;
 569     LARGE_INTEGER seek;
 570     ULARGE_INTEGER offset, length;
 571     HRESULT hr;
 572     ULONG bytesread;
 573     ICONDIRENTRY entry;
 574     IWICStream *substream=NULL;
 575     DWORD magic;
 576     TRACE("(%p,%u,%p)\n", iface, index, ppIBitmapFrame);
 577
 578     EnterCriticalSection(&This->lock);
 579
 580     if (!This->initialized)
 581     {
 582         hr = WINCODEC_ERR_NOTINITIALIZED;
 583         goto fail;
 584     }
 585
 586     if (This->header.idCount < index)
 587     {
 588         hr = E_INVALIDARG;
 589         goto fail;
 590     }
 591
 592     result = HeapAlloc(GetProcessHeap(), 0, sizeof(IcoFrameDecode));
 593     if (!result)
 594     {
 595         hr = E_OUTOFMEMORY;
 596         goto fail;
 597     }
 598
 599     result->IWICBitmapFrameDecode_iface.lpVtbl = &IcoFrameDecode_Vtbl;
 600     result->ref = 1;
 601     result->bits = NULL;
 602
 603     /* read the icon entry */
 604     seek.QuadPart = sizeof(ICONHEADER) + sizeof(ICONDIRENTRY) * index;
 605     hr = IStream_Seek(This->stream, seek, STREAM_SEEK_SET, 0);
 606     if (FAILED(hr)) goto fail;
 607
 608     hr = IStream_Read(This->stream, &entry, sizeof(ICONDIRENTRY), &bytesread);
 609     if (FAILED(hr) || bytesread != sizeof(ICONDIRENTRY)) goto fail;
 610
 611     /* create a stream object for this icon */
 612     hr = StreamImpl_Create(&substream);
 613     if (FAILED(hr)) goto fail;
 614
 615     offset.QuadPart = entry.dwDIBOffset;
 616     length.QuadPart = entry.dwDIBSize;
 617     hr = IWICStream_InitializeFromIStreamRegion(substream, This->stream, offset, length);
 618     if (FAILED(hr)) goto fail;
 619
 620     /* read the bitmapinfo size or magic number */
 621     hr = IWICStream_Read(substream, &magic, sizeof(magic), &bytesread);
 622     if (FAILED(hr) || bytesread != sizeof(magic)) goto fail;
 623
 624     /* forward to the appropriate decoding function based on the magic number */
 625     switch (magic)
 626     {
 627     case sizeof(BITMAPCOREHEADER):
 628     case 64: /* sizeof(BITMAPCOREHEADER2) */
 629     case sizeof(BITMAPINFOHEADER):
 630     case sizeof(BITMAPV4HEADER):
 631     case sizeof(BITMAPV5HEADER):
 632         hr = ReadIcoDib((IStream*)substream, result);
 633         break;
 634     case 0x474e5089:
 635         hr = ReadIcoPng((IStream*)substream, result);
 636         break;
 637     default:
 638         FIXME("Unrecognized ICO frame magic: %x\n", magic);
 639         hr = E_FAIL;
 640         break;
 641     }
 642     if (FAILED(hr)) goto fail;
 643
 644     *ppIBitmapFrame = (IWICBitmapFrameDecode*)result;
 645
 646     LeaveCriticalSection(&This->lock);
 647
 648     return S_OK;
 649
 650 fail:
 651     LeaveCriticalSection(&This->lock);
 652     HeapFree(GetProcessHeap(), 0, result);
 653     if (substream) IStream_Release(substream);
 654     if (SUCCEEDED(hr)) hr = E_FAIL;
 655     TRACE("<-- %x\n", hr);
 656     return hr;
 657 }
 658
 659 static const IWICBitmapDecoderVtbl IcoDecoder_Vtbl = {
 660     IcoDecoder_QueryInterface,
 661     IcoDecoder_AddRef,
 662     IcoDecoder_Release,
 663     IcoDecoder_QueryCapability,
 664     IcoDecoder_Initialize,
 665     IcoDecoder_GetContainerFormat,
 666     IcoDecoder_GetDecoderInfo,
 667     IcoDecoder_CopyPalette,
 668     IcoDecoder_GetMetadataQueryReader,
 669     IcoDecoder_GetPreview,
 670     IcoDecoder_GetColorContexts,
 671     IcoDecoder_GetThumbnail,
 672     IcoDecoder_GetFrameCount,
 673     IcoDecoder_GetFrame
 674 };
 675
 676 HRESULT IcoDecoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv)
 677 {
 678     IcoDecoder *This;
 679     HRESULT ret;
 680
 681     TRACE("(%p,%s,%p)\n", pUnkOuter, debugstr_guid(iid), ppv);
 682
 683     *ppv = NULL;
 684
 685     if (pUnkOuter) return CLASS_E_NOAGGREGATION;
 686
 687     This = HeapAlloc(GetProcessHeap(), 0, sizeof(IcoDecoder));
 688     if (!This) return E_OUTOFMEMORY;
 689
 690     This->IWICBitmapDecoder_iface.lpVtbl = &IcoDecoder_Vtbl;
 691     This->ref = 1;
 692     This->stream = NULL;
 693     This->initialized = FALSE;
 694     InitializeCriticalSection(&This->lock);
 695     This->lock.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": IcoDecoder.lock");
 696
 697     ret = IUnknown_QueryInterface((IUnknown*)This, iid, ppv);
 698     IUnknown_Release((IUnknown*)This);
 699
 700     return ret;
 701 }