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     double dpiX, dpiY;
  73     BYTE *bits;
  74 } IcoFrameDecode;
  75
  76 static inline IcoDecoder *impl_from_IWICBitmapDecoder(IWICBitmapDecoder *iface)
  77 {
  78     return CONTAINING_RECORD(iface, IcoDecoder, IWICBitmapDecoder_iface);
  79 }
  80
  81 static inline IcoFrameDecode *impl_from_IWICBitmapFrameDecode(IWICBitmapFrameDecode *iface)
  82 {
  83     return CONTAINING_RECORD(iface, IcoFrameDecode, IWICBitmapFrameDecode_iface);
  84 }
  85
  86 static HRESULT WINAPI IcoFrameDecode_QueryInterface(IWICBitmapFrameDecode *iface, REFIID iid,
  87     void **ppv)
  88 {
  89     IcoFrameDecode *This = impl_from_IWICBitmapFrameDecode(iface);
  90     TRACE("(%p,%s,%p)\n", iface, debugstr_guid(iid), ppv);
  91
  92     if (!ppv) return E_INVALIDARG;
  93
  94     if (IsEqualIID(&IID_IUnknown, iid) ||
  95         IsEqualIID(&IID_IWICBitmapSource, iid) ||
  96         IsEqualIID(&IID_IWICBitmapFrameDecode, iid))
  97     {
  98         *ppv = This;
  99     }
 100     else
 101     {
 102         *ppv = NULL;
 103         return E_NOINTERFACE;
 104     }
 105
 106     IUnknown_AddRef((IUnknown*)*ppv);
 107     return S_OK;
 108 }
 109
 110 static ULONG WINAPI IcoFrameDecode_AddRef(IWICBitmapFrameDecode *iface)
 111 {
 112     IcoFrameDecode *This = impl_from_IWICBitmapFrameDecode(iface);
 113     ULONG ref = InterlockedIncrement(&This->ref);
 114
 115     TRACE("(%p) refcount=%u\n", iface, ref);
 116
 117     return ref;
 118 }
 119
 120 static ULONG WINAPI IcoFrameDecode_Release(IWICBitmapFrameDecode *iface)
 121 {
 122     IcoFrameDecode *This = impl_from_IWICBitmapFrameDecode(iface);
 123     ULONG ref = InterlockedDecrement(&This->ref);
 124
 125     TRACE("(%p) refcount=%u\n", iface, ref);
 126
 127     if (ref == 0)
 128     {
 129         HeapFree(GetProcessHeap(), 0, This->bits);
 130         HeapFree(GetProcessHeap(), 0, This);
 131     }
 132
 133     return ref;
 134 }
 135
 136 static HRESULT WINAPI IcoFrameDecode_GetSize(IWICBitmapFrameDecode *iface,
 137     UINT *puiWidth, UINT *puiHeight)
 138 {
 139     IcoFrameDecode *This = impl_from_IWICBitmapFrameDecode(iface);
 140
 141     *puiWidth = This->width;
 142     *puiHeight = This->height;
 143
 144     TRACE("(%p) -> (%i,%i)\n", iface, *puiWidth, *puiHeight);
 145
 146     return S_OK;
 147 }
 148
 149 static HRESULT WINAPI IcoFrameDecode_GetPixelFormat(IWICBitmapFrameDecode *iface,
 150     WICPixelFormatGUID *pPixelFormat)
 151 {
 152     memcpy(pPixelFormat, &GUID_WICPixelFormat32bppBGRA, sizeof(GUID));
 153     return S_OK;
 154 }
 155
 156 static HRESULT WINAPI IcoFrameDecode_GetResolution(IWICBitmapFrameDecode *iface,
 157     double *pDpiX, double *pDpiY)
 158 {
 159     IcoFrameDecode *This = impl_from_IWICBitmapFrameDecode(iface);
 160
 161     *pDpiX = This->dpiX;
 162     *pDpiY = This->dpiY;
 163
 164     TRACE("(%p) -> (%f,%f)\n", iface, *pDpiX, *pDpiY);
 165
 166     return S_OK;
 167 }
 168
 169 static HRESULT WINAPI IcoFrameDecode_CopyPalette(IWICBitmapFrameDecode *iface,
 170     IWICPalette *pIPalette)
 171 {
 172     TRACE("(%p,%p)\n", iface, pIPalette);
 173     return WINCODEC_ERR_PALETTEUNAVAILABLE;
 174 }
 175
 176 static HRESULT WINAPI IcoFrameDecode_CopyPixels(IWICBitmapFrameDecode *iface,
 177     const WICRect *prc, UINT cbStride, UINT cbBufferSize, BYTE *pbBuffer)
 178 {
 179     IcoFrameDecode *This = impl_from_IWICBitmapFrameDecode(iface);
 180     TRACE("(%p,%p,%u,%u,%p)\n", iface, prc, cbStride, cbBufferSize, pbBuffer);
 181
 182     return copy_pixels(32, This->bits, This->width, This->height, This->width * 4,
 183         prc, cbStride, cbBufferSize, pbBuffer);
 184 }
 185
 186 static HRESULT WINAPI IcoFrameDecode_GetMetadataQueryReader(IWICBitmapFrameDecode *iface,
 187     IWICMetadataQueryReader **ppIMetadataQueryReader)
 188 {
 189     TRACE("(%p,%p)\n", iface, ppIMetadataQueryReader);
 190     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 191 }
 192
 193 static HRESULT WINAPI IcoFrameDecode_GetColorContexts(IWICBitmapFrameDecode *iface,
 194     UINT cCount, IWICColorContext **ppIColorContexts, UINT *pcActualCount)
 195 {
 196     TRACE("(%p,%u,%p,%p)\n", iface, cCount, ppIColorContexts, pcActualCount);
 197     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 198 }
 199
 200 static HRESULT WINAPI IcoFrameDecode_GetThumbnail(IWICBitmapFrameDecode *iface,
 201     IWICBitmapSource **ppIThumbnail)
 202 {
 203     TRACE("(%p,%p)\n", iface, ppIThumbnail);
 204     return WINCODEC_ERR_CODECNOTHUMBNAIL;
 205 }
 206
 207 static const IWICBitmapFrameDecodeVtbl IcoFrameDecode_Vtbl = {
 208     IcoFrameDecode_QueryInterface,
 209     IcoFrameDecode_AddRef,
 210     IcoFrameDecode_Release,
 211     IcoFrameDecode_GetSize,
 212     IcoFrameDecode_GetPixelFormat,
 213     IcoFrameDecode_GetResolution,
 214     IcoFrameDecode_CopyPalette,
 215     IcoFrameDecode_CopyPixels,
 216     IcoFrameDecode_GetMetadataQueryReader,
 217     IcoFrameDecode_GetColorContexts,
 218     IcoFrameDecode_GetThumbnail
 219 };
 220
 221 static inline void pixel_set_trans(DWORD* pixel, BOOL transparent)
 222 {
 223     if (transparent) *pixel = 0;
 224     else *pixel |= 0xff000000;
 225 }
 226
 227 static HRESULT ReadIcoDib(IStream *stream, IcoFrameDecode *result)
 228 {
 229     HRESULT hr;
 230     BmpDecoder *bmp_decoder;
 231     IWICBitmapDecoder *decoder;
 232     IWICBitmapFrameDecode *framedecode;
 233     WICPixelFormatGUID pixelformat;
 234     IWICBitmapSource *source;
 235     int has_alpha=FALSE; /* if TRUE, alpha data might be in the image data */
 236     WICRect rc;
 237
 238     hr = IcoDibDecoder_CreateInstance(&bmp_decoder);
 239     if (SUCCEEDED(hr))
 240     {
 241         BmpDecoder_GetWICDecoder(bmp_decoder, &decoder);
 242         hr = IWICBitmapDecoder_Initialize(decoder, stream, WICDecodeMetadataCacheOnLoad);
 243
 244         if (SUCCEEDED(hr))
 245             hr = IWICBitmapDecoder_GetFrame(decoder, 0, &framedecode);
 246
 247         if (SUCCEEDED(hr))
 248         {
 249             hr = IWICBitmapFrameDecode_GetSize(framedecode, &result->width, &result->height);
 250
 251             if (SUCCEEDED(hr))
 252             {
 253                 result->bits = HeapAlloc(GetProcessHeap(), 0, result->width * result->height * 4);
 254                 if (!result->bits) hr = E_OUTOFMEMORY;
 255             }
 256
 257             if (SUCCEEDED(hr))
 258                 hr = IWICBitmapFrameDecode_GetPixelFormat(framedecode, &pixelformat);
 259
 260             if (IsEqualGUID(&pixelformat, &GUID_WICPixelFormat32bppBGR) ||
 261                 IsEqualGUID(&pixelformat, &GUID_WICPixelFormat32bppBGRA))
 262             {
 263                 source = (IWICBitmapSource*)framedecode;
 264                 IWICBitmapSource_AddRef(source);
 265                 has_alpha = TRUE;
 266             }
 267             else
 268             {
 269                 hr = WICConvertBitmapSource(&GUID_WICPixelFormat32bppBGRA,
 270                     (IWICBitmapSource*)framedecode, &source);
 271                 has_alpha = FALSE;
 272             }
 273
 274             if (SUCCEEDED(hr))
 275             {
 276                 rc.X = 0;
 277                 rc.Y = 0;
 278                 rc.Width = result->width;
 279                 rc.Height = result->height;
 280                 hr = IWICBitmapSource_CopyPixels(source, &rc, result->width * 4,
 281                     result->width * result->height * 4, result->bits);
 282
 283                 IWICBitmapSource_Release(source);
 284             }
 285
 286             if (SUCCEEDED(hr))
 287                 hr = IWICBitmapFrameDecode_GetResolution(framedecode, &result->dpiX, &result->dpiY);
 288
 289             IWICBitmapFrameDecode_Release(framedecode);
 290         }
 291
 292         if (SUCCEEDED(hr) && has_alpha)
 293         {
 294             /* If the alpha channel is fully transparent, we should ignore it. */
 295             int nonzero_alpha = 0;
 296             int i;
 297
 298             for (i=0; i<(result->height*result->width); i++)
 299             {
 300                 if (result->bits[i*4+3] != 0)
 301                 {
 302                     nonzero_alpha = 1;
 303                     break;
 304                 }
 305             }
 306
 307             if (!nonzero_alpha)
 308             {
 309                 for (i=0; i<(result->height*result->width); i++)
 310                     result->bits[i*4+3] = 0xff;
 311
 312                 has_alpha = FALSE;
 313             }
 314         }
 315
 316         if (SUCCEEDED(hr) && !has_alpha)
 317         {
 318             /* set alpha data based on the AND mask */
 319             UINT andBytesPerRow = (result->width+31)/32*4;
 320             UINT andBytes = andBytesPerRow * result->height;
 321             INT andStride;
 322             BYTE *tempdata=NULL;
 323             BYTE *andRow;
 324             BYTE *bitsRow;
 325             UINT bitsStride = result->width * 4;
 326             UINT x, y;
 327             ULONG offset;
 328             ULONG bytesread;
 329             LARGE_INTEGER seek;
 330             int topdown;
 331
 332             BmpDecoder_FindIconMask(bmp_decoder, &offset, &topdown);
 333
 334             if (offset)
 335             {
 336                 seek.QuadPart = offset;
 337
 338                 hr = IStream_Seek(stream, seek, STREAM_SEEK_SET, 0);
 339
 340                 if (SUCCEEDED(hr))
 341                 {
 342                     tempdata = HeapAlloc(GetProcessHeap(), 0, andBytes);
 343                     if (!tempdata) hr = E_OUTOFMEMORY;
 344                 }
 345
 346                 if (SUCCEEDED(hr))
 347                     hr = IStream_Read(stream, tempdata, andBytes, &bytesread);
 348
 349                 if (SUCCEEDED(hr) && bytesread == andBytes)
 350                 {
 351                     if (topdown)
 352                     {
 353                         andStride = andBytesPerRow;
 354                         andRow = tempdata;
 355                     }
 356                     else
 357                     {
 358                         andStride = -andBytesPerRow;
 359                         andRow = tempdata + (result->height-1)*andBytesPerRow;
 360                     }
 361
 362                     bitsRow = result->bits;
 363                     for (y=0; y<result->height; y++) {
 364                         BYTE *andByte=andRow;
 365                         DWORD *bitsPixel=(DWORD*)bitsRow;
 366                         for (x=0; x<result->width; x+=8) {
 367                             BYTE andVal=*andByte++;
 368                             pixel_set_trans(bitsPixel++, andVal>>7&1);
 369                             if (x+1 < result->width) pixel_set_trans(bitsPixel++, andVal>>6&1);
 370                             if (x+2 < result->width) pixel_set_trans(bitsPixel++, andVal>>5&1);
 371                             if (x+3 < result->width) pixel_set_trans(bitsPixel++, andVal>>4&1);
 372                             if (x+4 < result->width) pixel_set_trans(bitsPixel++, andVal>>3&1);
 373                             if (x+5 < result->width) pixel_set_trans(bitsPixel++, andVal>>2&1);
 374                             if (x+6 < result->width) pixel_set_trans(bitsPixel++, andVal>>1&1);
 375                             if (x+7 < result->width) pixel_set_trans(bitsPixel++, andVal&1);
 376                         }
 377                         andRow += andStride;
 378                         bitsRow += bitsStride;
 379                     }
 380                 }
 381
 382                 HeapFree(GetProcessHeap(), 0, tempdata);
 383             }
 384         }
 385
 386         IWICBitmapDecoder_Release(decoder);
 387     }
 388
 389     return hr;
 390 }
 391
 392 static HRESULT ReadIcoPng(IStream *stream, IcoFrameDecode *result)
 393 {
 394     IWICBitmapDecoder *decoder = NULL;
 395     IWICBitmapFrameDecode *sourceFrame = NULL;
 396     IWICBitmapSource *sourceBitmap = NULL;
 397     WICRect rect;
 398     HRESULT hr;
 399
 400     hr = PngDecoder_CreateInstance(NULL, &IID_IWICBitmapDecoder, (void**)&decoder);
 401     if (FAILED(hr))
 402         goto end;
 403     hr = IWICBitmapDecoder_Initialize(decoder, stream, WICDecodeMetadataCacheOnLoad);
 404     if (FAILED(hr))
 405         goto end;
 406     hr = IWICBitmapDecoder_GetFrame(decoder, 0, &sourceFrame);
 407     if (FAILED(hr))
 408         goto end;
 409     hr = WICConvertBitmapSource(&GUID_WICPixelFormat32bppBGRA, (IWICBitmapSource*)sourceFrame, &sourceBitmap);
 410     if (FAILED(hr))
 411         goto end;
 412     hr = IWICBitmapFrameDecode_GetSize(sourceFrame, &result->width, &result->height);
 413     if (FAILED(hr))
 414         goto end;
 415     hr = IWICBitmapFrameDecode_GetResolution(sourceFrame, &result->dpiX, &result->dpiY);
 416     if (FAILED(hr))
 417         goto end;
 418     result->bits = HeapAlloc(GetProcessHeap(), 0, 4 * result->width * result->height);
 419     if (result->bits == NULL)
 420     {
 421         hr = E_OUTOFMEMORY;
 422         goto end;
 423     }
 424     rect.X = 0;
 425     rect.Y = 0;
 426     rect.Width = result->width;
 427     rect.Height = result->height;
 428     hr = IWICBitmapSource_CopyPixels(sourceBitmap, &rect, 4*result->width,
 429                                      4*result->width*result->height, result->bits);
 430
 431 end:
 432     if (decoder != NULL)
 433         IWICBitmapDecoder_Release(decoder);
 434     if (sourceFrame != NULL)
 435         IWICBitmapFrameDecode_Release(sourceFrame);
 436     if (sourceBitmap != NULL)
 437         IWICBitmapSource_Release(sourceBitmap);
 438     return hr;
 439 }
 440
 441 static HRESULT WINAPI IcoDecoder_QueryInterface(IWICBitmapDecoder *iface, REFIID iid,
 442     void **ppv)
 443 {
 444     IcoDecoder *This = impl_from_IWICBitmapDecoder(iface);
 445     TRACE("(%p,%s,%p)\n", iface, debugstr_guid(iid), ppv);
 446
 447     if (!ppv) return E_INVALIDARG;
 448
 449     if (IsEqualIID(&IID_IUnknown, iid) || IsEqualIID(&IID_IWICBitmapDecoder, iid))
 450     {
 451         *ppv = This;
 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 *pIStream,
 492     DWORD *pdwCapability)
 493 {
 494     FIXME("(%p,%p,%p): stub\n", iface, pIStream, pdwCapability);
 495     return E_NOTIMPL;
 496 }
 497
 498 static HRESULT WINAPI IcoDecoder_Initialize(IWICBitmapDecoder *iface, IStream *pIStream,
 499     WICDecodeOptions cacheOptions)
 500 {
 501     IcoDecoder *This = impl_from_IWICBitmapDecoder(iface);
 502     LARGE_INTEGER seek;
 503     HRESULT hr;
 504     ULONG bytesread;
 505     TRACE("(%p,%p,%x)\n", iface, pIStream, cacheOptions);
 506
 507     EnterCriticalSection(&This->lock);
 508
 509     if (This->initialized)
 510     {
 511         hr = WINCODEC_ERR_WRONGSTATE;
 512         goto end;
 513     }
 514
 515     seek.QuadPart = 0;
 516     hr = IStream_Seek(pIStream, seek, STREAM_SEEK_SET, NULL);
 517     if (FAILED(hr)) goto end;
 518
 519     hr = IStream_Read(pIStream, &This->header, sizeof(ICONHEADER), &bytesread);
 520     if (FAILED(hr)) goto end;
 521     if (bytesread != sizeof(ICONHEADER) ||
 522         This->header.idReserved != 0 ||
 523         This->header.idType != 1)
 524     {
 525         hr = E_FAIL;
 526         goto end;
 527     }
 528
 529     This->initialized = TRUE;
 530     This->stream = pIStream;
 531     IStream_AddRef(pIStream);
 532
 533 end:
 534
 535     LeaveCriticalSection(&This->lock);
 536
 537     return hr;
 538 }
 539
 540 static HRESULT WINAPI IcoDecoder_GetContainerFormat(IWICBitmapDecoder *iface,
 541     GUID *pguidContainerFormat)
 542 {
 543     memcpy(pguidContainerFormat, &GUID_ContainerFormatIco, sizeof(GUID));
 544     return S_OK;
 545 }
 546
 547 static HRESULT WINAPI IcoDecoder_GetDecoderInfo(IWICBitmapDecoder *iface,
 548     IWICBitmapDecoderInfo **ppIDecoderInfo)
 549 {
 550     HRESULT hr;
 551     IWICComponentInfo *compinfo;
 552
 553     TRACE("(%p,%p)\n", iface, ppIDecoderInfo);
 554
 555     hr = CreateComponentInfo(&CLSID_WICIcoDecoder, &compinfo);
 556     if (FAILED(hr)) return hr;
 557
 558     hr = IWICComponentInfo_QueryInterface(compinfo, &IID_IWICBitmapDecoderInfo,
 559         (void**)ppIDecoderInfo);
 560
 561     IWICComponentInfo_Release(compinfo);
 562
 563     return hr;
 564 }
 565
 566 static HRESULT WINAPI IcoDecoder_CopyPalette(IWICBitmapDecoder *iface,
 567     IWICPalette *pIPalette)
 568 {
 569     TRACE("(%p,%p)\n", iface, pIPalette);
 570     return WINCODEC_ERR_PALETTEUNAVAILABLE;
 571 }
 572
 573 static HRESULT WINAPI IcoDecoder_GetMetadataQueryReader(IWICBitmapDecoder *iface,
 574     IWICMetadataQueryReader **ppIMetadataQueryReader)
 575 {
 576     TRACE("(%p,%p)\n", iface, ppIMetadataQueryReader);
 577     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 578 }
 579
 580 static HRESULT WINAPI IcoDecoder_GetPreview(IWICBitmapDecoder *iface,
 581     IWICBitmapSource **ppIBitmapSource)
 582 {
 583     TRACE("(%p,%p)\n", iface, ppIBitmapSource);
 584     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 585 }
 586
 587 static HRESULT WINAPI IcoDecoder_GetColorContexts(IWICBitmapDecoder *iface,
 588     UINT cCount, IWICColorContext **ppIColorContexts, UINT *pcActualCount)
 589 {
 590     TRACE("(%p,%u,%p,%p)\n", iface, cCount, ppIColorContexts, pcActualCount);
 591     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 592 }
 593
 594 static HRESULT WINAPI IcoDecoder_GetThumbnail(IWICBitmapDecoder *iface,
 595     IWICBitmapSource **ppIThumbnail)
 596 {
 597     TRACE("(%p,%p)\n", iface, ppIThumbnail);
 598     return WINCODEC_ERR_CODECNOTHUMBNAIL;
 599 }
 600
 601 static HRESULT WINAPI IcoDecoder_GetFrameCount(IWICBitmapDecoder *iface,
 602     UINT *pCount)
 603 {
 604     IcoDecoder *This = impl_from_IWICBitmapDecoder(iface);
 605     TRACE("(%p,%p)\n", iface, pCount);
 606
 607     if (!This->initialized) return WINCODEC_ERR_NOTINITIALIZED;
 608
 609     *pCount = This->header.idCount;
 610     TRACE("<-- %u\n", *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_NOTINITIALIZED;
 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 = (IWICBitmapFrameDecode*)result;
 696
 697     LeaveCriticalSection(&This->lock);
 698
 699     IStream_Release(substream);
 700
 701     return S_OK;
 702
 703 fail:
 704     LeaveCriticalSection(&This->lock);
 705     HeapFree(GetProcessHeap(), 0, result);
 706     if (substream) IStream_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(IUnknown *pUnkOuter, REFIID iid, void** ppv)
 730 {
 731     IcoDecoder *This;
 732     HRESULT ret;
 733
 734     TRACE("(%p,%s,%p)\n", pUnkOuter, debugstr_guid(iid), ppv);
 735
 736     *ppv = NULL;
 737
 738     if (pUnkOuter) return CLASS_E_NOAGGREGATION;
 739
 740     This = HeapAlloc(GetProcessHeap(), 0, sizeof(IcoDecoder));
 741     if (!This) return E_OUTOFMEMORY;
 742
 743     This->IWICBitmapDecoder_iface.lpVtbl = &IcoDecoder_Vtbl;
 744     This->ref = 1;
 745     This->stream = NULL;
 746     This->initialized = FALSE;
 747     InitializeCriticalSection(&This->lock);
 748     This->lock.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": IcoDecoder.lock");
 749
 750     ret = IUnknown_QueryInterface((IUnknown*)This, iid, ppv);
 751     IUnknown_Release((IUnknown*)This);
 752
 753     return ret;
 754 }