dll/win32/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
  30 #include "wincodecs_private.h"
  31
  32 #include "wine/debug.h"
  33
  34 WINE_DEFAULT_DEBUG_CHANNEL(wincodecs);
  35
  36 #include "pshpack1.h"
  37
  38 typedef struct {
  39     BYTE bWidth;
  40     BYTE bHeight;
  41     BYTE bColorCount;
  42     BYTE bReserved;
  43     WORD wPlanes;
  44     WORD wBitCount;
  45     DWORD dwDIBSize;
  46     DWORD dwDIBOffset;
  47 } ICONDIRENTRY;
  48
  49 typedef struct
  50 {
  51     WORD idReserved;
  52     WORD idType;
  53     WORD idCount;
  54 } ICONHEADER;
  55
  56 #include "poppack.h"
  57
  58 typedef struct {
  59     IWICBitmapDecoder IWICBitmapDecoder_iface;
  60     LONG ref;
  61     BOOL initialized;
  62     IStream *stream;
  63     ICONHEADER header;
  64     CRITICAL_SECTION lock; /* must be held when accessing stream */
  65 } IcoDecoder;
  66
  67 typedef struct {
  68     IWICBitmapFrameDecode IWICBitmapFrameDecode_iface;
  69     LONG ref;
  70     UINT width, height;
  71     double dpiX, dpiY;
  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->IWICBitmapFrameDecode_iface;
  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     IcoFrameDecode *This = impl_from_IWICBitmapFrameDecode(iface);
 159
 160     *pDpiX = This->dpiX;
 161     *pDpiY = This->dpiY;
 162
 163     TRACE("(%p) -> (%f,%f)\n", iface, *pDpiX, *pDpiY);
 164
 165     return S_OK;
 166 }
 167
 168 static HRESULT WINAPI IcoFrameDecode_CopyPalette(IWICBitmapFrameDecode *iface,
 169     IWICPalette *pIPalette)
 170 {
 171     TRACE("(%p,%p)\n", iface, pIPalette);
 172     return WINCODEC_ERR_PALETTEUNAVAILABLE;
 173 }
 174
 175 static HRESULT WINAPI IcoFrameDecode_CopyPixels(IWICBitmapFrameDecode *iface,
 176     const WICRect *prc, UINT cbStride, UINT cbBufferSize, BYTE *pbBuffer)
 177 {
 178     IcoFrameDecode *This = impl_from_IWICBitmapFrameDecode(iface);
 179     TRACE("(%p,%p,%u,%u,%p)\n", iface, prc, cbStride, cbBufferSize, pbBuffer);
 180
 181     return copy_pixels(32, This->bits, This->width, This->height, This->width * 4,
 182         prc, cbStride, cbBufferSize, pbBuffer);
 183 }
 184
 185 static HRESULT WINAPI IcoFrameDecode_GetMetadataQueryReader(IWICBitmapFrameDecode *iface,
 186     IWICMetadataQueryReader **ppIMetadataQueryReader)
 187 {
 188     TRACE("(%p,%p)\n", iface, ppIMetadataQueryReader);
 189     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 190 }
 191
 192 static HRESULT WINAPI IcoFrameDecode_GetColorContexts(IWICBitmapFrameDecode *iface,
 193     UINT cCount, IWICColorContext **ppIColorContexts, UINT *pcActualCount)
 194 {
 195     TRACE("(%p,%u,%p,%p)\n", iface, cCount, ppIColorContexts, pcActualCount);
 196     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 197 }
 198
 199 static HRESULT WINAPI IcoFrameDecode_GetThumbnail(IWICBitmapFrameDecode *iface,
 200     IWICBitmapSource **ppIThumbnail)
 201 {
 202     TRACE("(%p,%p)\n", iface, ppIThumbnail);
 203     return IWICBitmapFrameDecode_QueryInterface(iface, &IID_IWICBitmapSource, (void **)ppIThumbnail);
 204 }
 205
 206 static const IWICBitmapFrameDecodeVtbl IcoFrameDecode_Vtbl = {
 207     IcoFrameDecode_QueryInterface,
 208     IcoFrameDecode_AddRef,
 209     IcoFrameDecode_Release,
 210     IcoFrameDecode_GetSize,
 211     IcoFrameDecode_GetPixelFormat,
 212     IcoFrameDecode_GetResolution,
 213     IcoFrameDecode_CopyPalette,
 214     IcoFrameDecode_CopyPixels,
 215     IcoFrameDecode_GetMetadataQueryReader,
 216     IcoFrameDecode_GetColorContexts,
 217     IcoFrameDecode_GetThumbnail
 218 };
 219
 220 static inline void pixel_set_trans(DWORD* pixel, BOOL transparent)
 221 {
 222     if (transparent) *pixel = 0;
 223     else *pixel |= 0xff000000;
 224 }
 225
 226 static HRESULT ReadIcoDib(IStream *stream, IcoFrameDecode *result)
 227 {
 228     HRESULT hr;
 229     BmpDecoder *bmp_decoder;
 230     IWICBitmapDecoder *decoder;
 231     IWICBitmapFrameDecode *framedecode;
 232     WICPixelFormatGUID pixelformat;
 233     IWICBitmapSource *source;
 234     BOOL has_alpha=FALSE; /* if TRUE, alpha data might be in the image data */
 235     WICRect rc;
 236
 237     hr = IcoDibDecoder_CreateInstance(&bmp_decoder);
 238     if (SUCCEEDED(hr))
 239     {
 240         BmpDecoder_GetWICDecoder(bmp_decoder, &decoder);
 241         hr = IWICBitmapDecoder_Initialize(decoder, stream, WICDecodeMetadataCacheOnLoad);
 242
 243         if (SUCCEEDED(hr))
 244             hr = IWICBitmapDecoder_GetFrame(decoder, 0, &framedecode);
 245
 246         if (SUCCEEDED(hr))
 247         {
 248             hr = IWICBitmapFrameDecode_GetSize(framedecode, &result->width, &result->height);
 249
 250             if (SUCCEEDED(hr))
 251             {
 252                 result->bits = HeapAlloc(GetProcessHeap(), 0, result->width * result->height * 4);
 253                 if (!result->bits) hr = E_OUTOFMEMORY;
 254             }
 255
 256             if (SUCCEEDED(hr))
 257                 hr = IWICBitmapFrameDecode_GetPixelFormat(framedecode, &pixelformat);
 258
 259             if (IsEqualGUID(&pixelformat, &GUID_WICPixelFormat32bppBGR) ||
 260                 IsEqualGUID(&pixelformat, &GUID_WICPixelFormat32bppBGRA))
 261             {
 262                 source = (IWICBitmapSource*)framedecode;
 263                 IWICBitmapSource_AddRef(source);
 264                 has_alpha = TRUE;
 265             }
 266             else
 267             {
 268                 hr = WICConvertBitmapSource(&GUID_WICPixelFormat32bppBGRA,
 269                     (IWICBitmapSource*)framedecode, &source);
 270                 has_alpha = FALSE;
 271             }
 272
 273             if (SUCCEEDED(hr))
 274             {
 275                 rc.X = 0;
 276                 rc.Y = 0;
 277                 rc.Width = result->width;
 278                 rc.Height = result->height;
 279                 hr = IWICBitmapSource_CopyPixels(source, &rc, result->width * 4,
 280                     result->width * result->height * 4, result->bits);
 281
 282                 IWICBitmapSource_Release(source);
 283             }
 284
 285             if (SUCCEEDED(hr))
 286                 hr = IWICBitmapFrameDecode_GetResolution(framedecode, &result->dpiX, &result->dpiY);
 287
 288             IWICBitmapFrameDecode_Release(framedecode);
 289         }
 290
 291         if (SUCCEEDED(hr) && has_alpha)
 292         {
 293             /* If the alpha channel is fully transparent, we should ignore it. */
 294             int nonzero_alpha = 0;
 295             UINT i;
 296
 297             for (i=0; i<(result->height*result->width); i++)
 298             {
 299                 if (result->bits[i*4+3] != 0)
 300                 {
 301                     nonzero_alpha = 1;
 302                     break;
 303                 }
 304             }
 305
 306             if (!nonzero_alpha)
 307             {
 308                 for (i=0; i<(result->height*result->width); i++)
 309                     result->bits[i*4+3] = 0xff;
 310
 311                 has_alpha = FALSE;
 312             }
 313         }
 314
 315         if (SUCCEEDED(hr) && !has_alpha)
 316         {
 317             /* set alpha data based on the AND mask */
 318             UINT andBytesPerRow = (result->width+31)/32*4;
 319             UINT andBytes = andBytesPerRow * result->height;
 320             INT andStride;
 321             BYTE *tempdata=NULL;
 322             BYTE *andRow;
 323             BYTE *bitsRow;
 324             UINT bitsStride = result->width * 4;
 325             UINT x, y;
 326             ULONG offset;
 327             ULONG bytesread;
 328             LARGE_INTEGER seek;
 329             int topdown;
 330
 331             BmpDecoder_FindIconMask(bmp_decoder, &offset, &topdown);
 332
 333             if (offset)
 334             {
 335                 seek.QuadPart = offset;
 336
 337                 hr = IStream_Seek(stream, seek, STREAM_SEEK_SET, 0);
 338
 339                 if (SUCCEEDED(hr))
 340                 {
 341                     tempdata = HeapAlloc(GetProcessHeap(), 0, andBytes);
 342                     if (!tempdata) hr = E_OUTOFMEMORY;
 343                 }
 344
 345                 if (SUCCEEDED(hr))
 346                     hr = IStream_Read(stream, tempdata, andBytes, &bytesread);
 347
 348                 if (SUCCEEDED(hr) && bytesread == andBytes)
 349                 {
 350                     if (topdown)
 351                     {
 352                         andStride = andBytesPerRow;
 353                         andRow = tempdata;
 354                     }
 355                     else
 356                     {
 357                         andStride = -andBytesPerRow;
 358                         andRow = tempdata + (result->height-1)*andBytesPerRow;
 359                     }
 360
 361                     bitsRow = result->bits;
 362                     for (y=0; y<result->height; y++) {
 363                         BYTE *andByte=andRow;
 364                         DWORD *bitsPixel=(DWORD*)bitsRow;
 365                         for (x=0; x<result->width; x+=8) {
 366                             BYTE andVal=*andByte++;
 367                             pixel_set_trans(bitsPixel++, andVal>>7&1);
 368                             if (x+1 < result->width) pixel_set_trans(bitsPixel++, andVal>>6&1);
 369                             if (x+2 < result->width) pixel_set_trans(bitsPixel++, andVal>>5&1);
 370                             if (x+3 < result->width) pixel_set_trans(bitsPixel++, andVal>>4&1);
 371                             if (x+4 < result->width) pixel_set_trans(bitsPixel++, andVal>>3&1);
 372                             if (x+5 < result->width) pixel_set_trans(bitsPixel++, andVal>>2&1);
 373                             if (x+6 < result->width) pixel_set_trans(bitsPixel++, andVal>>1&1);
 374                             if (x+7 < result->width) pixel_set_trans(bitsPixel++, andVal&1);
 375                         }
 376                         andRow += andStride;
 377                         bitsRow += bitsStride;
 378                     }
 379                 }
 380
 381                 HeapFree(GetProcessHeap(), 0, tempdata);
 382             }
 383         }
 384
 385         IWICBitmapDecoder_Release(decoder);
 386     }
 387
 388     return hr;
 389 }
 390
 391 static HRESULT ReadIcoPng(IStream *stream, IcoFrameDecode *result)
 392 {
 393     IWICBitmapDecoder *decoder = NULL;
 394     IWICBitmapFrameDecode *sourceFrame = NULL;
 395     IWICBitmapSource *sourceBitmap = NULL;
 396     WICRect rect;
 397     HRESULT hr;
 398
 399     hr = PngDecoder_CreateInstance(&IID_IWICBitmapDecoder, (void**)&decoder);
 400     if (FAILED(hr))
 401         goto end;
 402     hr = IWICBitmapDecoder_Initialize(decoder, stream, WICDecodeMetadataCacheOnLoad);
 403     if (FAILED(hr))
 404         goto end;
 405     hr = IWICBitmapDecoder_GetFrame(decoder, 0, &sourceFrame);
 406     if (FAILED(hr))
 407         goto end;
 408     hr = WICConvertBitmapSource(&GUID_WICPixelFormat32bppBGRA, (IWICBitmapSource*)sourceFrame, &sourceBitmap);
 409     if (FAILED(hr))
 410         goto end;
 411     hr = IWICBitmapFrameDecode_GetSize(sourceFrame, &result->width, &result->height);
 412     if (FAILED(hr))
 413         goto end;
 414     hr = IWICBitmapFrameDecode_GetResolution(sourceFrame, &result->dpiX, &result->dpiY);
 415     if (FAILED(hr))
 416         goto end;
 417     result->bits = HeapAlloc(GetProcessHeap(), 0, 4 * result->width * result->height);
 418     if (result->bits == NULL)
 419     {
 420         hr = E_OUTOFMEMORY;
 421         goto end;
 422     }
 423     rect.X = 0;
 424     rect.Y = 0;
 425     rect.Width = result->width;
 426     rect.Height = result->height;
 427     hr = IWICBitmapSource_CopyPixels(sourceBitmap, &rect, 4*result->width,
 428                                      4*result->width*result->height, result->bits);
 429
 430 end:
 431     if (decoder != NULL)
 432         IWICBitmapDecoder_Release(decoder);
 433     if (sourceFrame != NULL)
 434         IWICBitmapFrameDecode_Release(sourceFrame);
 435     if (sourceBitmap != NULL)
 436         IWICBitmapSource_Release(sourceBitmap);
 437     return hr;
 438 }
 439
 440 static HRESULT WINAPI IcoDecoder_QueryInterface(IWICBitmapDecoder *iface, REFIID iid,
 441     void **ppv)
 442 {
 443     IcoDecoder *This = impl_from_IWICBitmapDecoder(iface);
 444     TRACE("(%p,%s,%p)\n", iface, debugstr_guid(iid), ppv);
 445
 446     if (!ppv) return E_INVALIDARG;
 447
 448     if (IsEqualIID(&IID_IUnknown, iid) ||
 449         IsEqualIID(&IID_IWICBitmapDecoder, iid))
 450     {
 451         *ppv = &This->IWICBitmapDecoder_iface;
 452     }
 453     else
 454     {
 455         *ppv = NULL;
 456         return E_NOINTERFACE;
 457     }
 458
 459     IUnknown_AddRef((IUnknown*)*ppv);
 460     return S_OK;
 461 }
 462
 463 static ULONG WINAPI IcoDecoder_AddRef(IWICBitmapDecoder *iface)
 464 {
 465     IcoDecoder *This = impl_from_IWICBitmapDecoder(iface);
 466     ULONG ref = InterlockedIncrement(&This->ref);
 467
 468     TRACE("(%p) refcount=%u\n", iface, ref);
 469
 470     return ref;
 471 }
 472
 473 static ULONG WINAPI IcoDecoder_Release(IWICBitmapDecoder *iface)
 474 {
 475     IcoDecoder *This = impl_from_IWICBitmapDecoder(iface);
 476     ULONG ref = InterlockedDecrement(&This->ref);
 477
 478     TRACE("(%p) refcount=%u\n", iface, ref);
 479
 480     if (ref == 0)
 481     {
 482         This->lock.DebugInfo->Spare[0] = 0;
 483         DeleteCriticalSection(&This->lock);
 484         if (This->stream) IStream_Release(This->stream);
 485         HeapFree(GetProcessHeap(), 0, This);
 486     }
 487
 488     return ref;
 489 }
 490
 491 static HRESULT WINAPI IcoDecoder_QueryCapability(IWICBitmapDecoder *iface, IStream *stream,
 492     DWORD *capability)
 493 {
 494     HRESULT hr;
 495
 496     TRACE("(%p,%p,%p)\n", iface, stream, capability);
 497
 498     if (!stream || !capability) return E_INVALIDARG;
 499
 500     hr = IWICBitmapDecoder_Initialize(iface, stream, WICDecodeMetadataCacheOnDemand);
 501     if (hr != S_OK) return hr;
 502
 503     *capability = WICBitmapDecoderCapabilityCanDecodeAllImages;
 504     return S_OK;
 505 }
 506
 507 static HRESULT WINAPI IcoDecoder_Initialize(IWICBitmapDecoder *iface, IStream *pIStream,
 508     WICDecodeOptions cacheOptions)
 509 {
 510     IcoDecoder *This = impl_from_IWICBitmapDecoder(iface);
 511     LARGE_INTEGER seek;
 512     HRESULT hr;
 513     ULONG bytesread;
 514     TRACE("(%p,%p,%x)\n", iface, pIStream, cacheOptions);
 515
 516     EnterCriticalSection(&This->lock);
 517
 518     if (This->initialized)
 519     {
 520         hr = WINCODEC_ERR_WRONGSTATE;
 521         goto end;
 522     }
 523
 524     seek.QuadPart = 0;
 525     hr = IStream_Seek(pIStream, seek, STREAM_SEEK_SET, NULL);
 526     if (FAILED(hr)) goto end;
 527
 528     hr = IStream_Read(pIStream, &This->header, sizeof(ICONHEADER), &bytesread);
 529     if (FAILED(hr)) goto end;
 530     if (bytesread != sizeof(ICONHEADER) ||
 531         This->header.idReserved != 0 ||
 532         This->header.idType != 1)
 533     {
 534         hr = E_FAIL;
 535         goto end;
 536     }
 537
 538     This->initialized = TRUE;
 539     This->stream = pIStream;
 540     IStream_AddRef(pIStream);
 541
 542 end:
 543
 544     LeaveCriticalSection(&This->lock);
 545
 546     return hr;
 547 }
 548
 549 static HRESULT WINAPI IcoDecoder_GetContainerFormat(IWICBitmapDecoder *iface,
 550     GUID *pguidContainerFormat)
 551 {
 552     memcpy(pguidContainerFormat, &GUID_ContainerFormatIco, sizeof(GUID));
 553     return S_OK;
 554 }
 555
 556 static HRESULT WINAPI IcoDecoder_GetDecoderInfo(IWICBitmapDecoder *iface,
 557     IWICBitmapDecoderInfo **ppIDecoderInfo)
 558 {
 559     TRACE("(%p,%p)\n", iface, ppIDecoderInfo);
 560
 561     return get_decoder_info(&CLSID_WICIcoDecoder, ppIDecoderInfo);
 562 }
 563
 564 static HRESULT WINAPI IcoDecoder_CopyPalette(IWICBitmapDecoder *iface,
 565     IWICPalette *pIPalette)
 566 {
 567     TRACE("(%p,%p)\n", iface, pIPalette);
 568     return WINCODEC_ERR_PALETTEUNAVAILABLE;
 569 }
 570
 571 static HRESULT WINAPI IcoDecoder_GetMetadataQueryReader(IWICBitmapDecoder *iface,
 572     IWICMetadataQueryReader **ppIMetadataQueryReader)
 573 {
 574     TRACE("(%p,%p)\n", iface, ppIMetadataQueryReader);
 575     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 576 }
 577
 578 static HRESULT WINAPI IcoDecoder_GetPreview(IWICBitmapDecoder *iface,
 579     IWICBitmapSource **ppIBitmapSource)
 580 {
 581     TRACE("(%p,%p)\n", iface, ppIBitmapSource);
 582     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 583 }
 584
 585 static HRESULT WINAPI IcoDecoder_GetColorContexts(IWICBitmapDecoder *iface,
 586     UINT cCount, IWICColorContext **ppIColorContexts, UINT *pcActualCount)
 587 {
 588     TRACE("(%p,%u,%p,%p)\n", iface, cCount, ppIColorContexts, pcActualCount);
 589     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 590 }
 591
 592 static HRESULT WINAPI IcoDecoder_GetThumbnail(IWICBitmapDecoder *iface,
 593     IWICBitmapSource **ppIThumbnail)
 594 {
 595     TRACE("(%p,%p)\n", iface, ppIThumbnail);
 596     return WINCODEC_ERR_CODECNOTHUMBNAIL;
 597 }
 598
 599 static HRESULT WINAPI IcoDecoder_GetFrameCount(IWICBitmapDecoder *iface,
 600     UINT *pCount)
 601 {
 602     IcoDecoder *This = impl_from_IWICBitmapDecoder(iface);
 603
 604     if (!pCount) return E_INVALIDARG;
 605
 606     EnterCriticalSection(&This->lock);
 607     *pCount = This->initialized ? This->header.idCount : 0;
 608     LeaveCriticalSection(&This->lock);
 609
 610     TRACE("(%p) <-- %d\n", iface, *pCount);
 611
 612     return S_OK;
 613 }
 614
 615 static HRESULT WINAPI IcoDecoder_GetFrame(IWICBitmapDecoder *iface,
 616     UINT index, IWICBitmapFrameDecode **ppIBitmapFrame)
 617 {
 618     IcoDecoder *This = impl_from_IWICBitmapDecoder(iface);
 619     IcoFrameDecode *result=NULL;
 620     LARGE_INTEGER seek;
 621     ULARGE_INTEGER offset, length;
 622     HRESULT hr;
 623     ULONG bytesread;
 624     ICONDIRENTRY entry;
 625     IWICStream *substream=NULL;
 626     DWORD magic;
 627     TRACE("(%p,%u,%p)\n", iface, index, ppIBitmapFrame);
 628
 629     EnterCriticalSection(&This->lock);
 630
 631     if (!This->initialized)
 632     {
 633         hr = WINCODEC_ERR_FRAMEMISSING;
 634         goto fail;
 635     }
 636
 637     if (This->header.idCount < index)
 638     {
 639         hr = E_INVALIDARG;
 640         goto fail;
 641     }
 642
 643     result = HeapAlloc(GetProcessHeap(), 0, sizeof(IcoFrameDecode));
 644     if (!result)
 645     {
 646         hr = E_OUTOFMEMORY;
 647         goto fail;
 648     }
 649
 650     result->IWICBitmapFrameDecode_iface.lpVtbl = &IcoFrameDecode_Vtbl;
 651     result->ref = 1;
 652     result->bits = NULL;
 653
 654     /* read the icon entry */
 655     seek.QuadPart = sizeof(ICONHEADER) + sizeof(ICONDIRENTRY) * index;
 656     hr = IStream_Seek(This->stream, seek, STREAM_SEEK_SET, 0);
 657     if (FAILED(hr)) goto fail;
 658
 659     hr = IStream_Read(This->stream, &entry, sizeof(ICONDIRENTRY), &bytesread);
 660     if (FAILED(hr) || bytesread != sizeof(ICONDIRENTRY)) goto fail;
 661
 662     /* create a stream object for this icon */
 663     hr = StreamImpl_Create(&substream);
 664     if (FAILED(hr)) goto fail;
 665
 666     offset.QuadPart = entry.dwDIBOffset;
 667     length.QuadPart = entry.dwDIBSize;
 668     hr = IWICStream_InitializeFromIStreamRegion(substream, This->stream, offset, length);
 669     if (FAILED(hr)) goto fail;
 670
 671     /* read the bitmapinfo size or magic number */
 672     hr = IWICStream_Read(substream, &magic, sizeof(magic), &bytesread);
 673     if (FAILED(hr) || bytesread != sizeof(magic)) goto fail;
 674
 675     /* forward to the appropriate decoding function based on the magic number */
 676     switch (magic)
 677     {
 678     case sizeof(BITMAPCOREHEADER):
 679     case 64: /* sizeof(BITMAPCOREHEADER2) */
 680     case sizeof(BITMAPINFOHEADER):
 681     case sizeof(BITMAPV4HEADER):
 682     case sizeof(BITMAPV5HEADER):
 683         hr = ReadIcoDib((IStream*)substream, result);
 684         break;
 685     case 0x474e5089:
 686         hr = ReadIcoPng((IStream*)substream, result);
 687         break;
 688     default:
 689         FIXME("Unrecognized ICO frame magic: %x\n", magic);
 690         hr = E_FAIL;
 691         break;
 692     }
 693     if (FAILED(hr)) goto fail;
 694
 695     *ppIBitmapFrame = &result->IWICBitmapFrameDecode_iface;
 696
 697     LeaveCriticalSection(&This->lock);
 698
 699     IWICStream_Release(substream);
 700
 701     return S_OK;
 702
 703 fail:
 704     LeaveCriticalSection(&This->lock);
 705     HeapFree(GetProcessHeap(), 0, result);
 706     if (substream) IWICStream_Release(substream);
 707     if (SUCCEEDED(hr)) hr = E_FAIL;
 708     TRACE("<-- %x\n", hr);
 709     return hr;
 710 }
 711
 712 static const IWICBitmapDecoderVtbl IcoDecoder_Vtbl = {
 713     IcoDecoder_QueryInterface,
 714     IcoDecoder_AddRef,
 715     IcoDecoder_Release,
 716     IcoDecoder_QueryCapability,
 717     IcoDecoder_Initialize,
 718     IcoDecoder_GetContainerFormat,
 719     IcoDecoder_GetDecoderInfo,
 720     IcoDecoder_CopyPalette,
 721     IcoDecoder_GetMetadataQueryReader,
 722     IcoDecoder_GetPreview,
 723     IcoDecoder_GetColorContexts,
 724     IcoDecoder_GetThumbnail,
 725     IcoDecoder_GetFrameCount,
 726     IcoDecoder_GetFrame
 727 };
 728
 729 HRESULT IcoDecoder_CreateInstance(REFIID iid, void** ppv)
 730 {
 731     IcoDecoder *This;
 732     HRESULT ret;
 733
 734     TRACE("(%s,%p)\n", debugstr_guid(iid), ppv);
 735
 736     *ppv = NULL;
 737
 738     This = HeapAlloc(GetProcessHeap(), 0, sizeof(IcoDecoder));
 739     if (!This) return E_OUTOFMEMORY;
 740
 741     This->IWICBitmapDecoder_iface.lpVtbl = &IcoDecoder_Vtbl;
 742     This->ref = 1;
 743     This->stream = NULL;
 744     This->initialized = FALSE;
 745     InitializeCriticalSection(&This->lock);
 746     This->lock.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": IcoDecoder.lock");
 747
 748     ret = IWICBitmapDecoder_QueryInterface(&This->IWICBitmapDecoder_iface, iid, ppv);
 749     IWICBitmapDecoder_Release(&This->IWICBitmapDecoder_iface);
 750
 751     return ret;
 752 }