git.oblomov.eu Git - wine/blob - dlls/windowscodecs/bmpdecode.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 "winreg.h"
  28 #include "wingdi.h"
  29 #include "objbase.h"
  30 #include "wincodec.h"
  31
  32 #include "wincodecs_private.h"
  33
  34 #include "wine/debug.h"
  35
  36 WINE_DEFAULT_DEBUG_CHANNEL(wincodecs);
  37
  38 typedef struct {
  39     DWORD bc2Size;
  40     DWORD bc2Width;
  41     DWORD bc2Height;
  42     WORD  bc2Planes;
  43     WORD  bc2BitCount;
  44     DWORD bc2Compression;
  45     DWORD bc2SizeImage;
  46     DWORD bc2XRes;
  47     DWORD bc2YRes;
  48     DWORD bc2ClrUsed;
  49     DWORD bc2ClrImportant;
  50     /* same as BITMAPINFOHEADER until this point */
  51     WORD  bc2ResUnit;
  52     WORD  bc2Reserved;
  53     WORD  bc2Orientation;
  54     WORD  bc2Halftoning;
  55     DWORD bc2HalftoneSize1;
  56     DWORD bc2HalftoneSize2;
  57     DWORD bc2ColorSpace;
  58     DWORD bc2AppData;
  59 } BITMAPCOREHEADER2;
  60
  61 struct BmpDecoder;
  62 typedef HRESULT (*ReadDataFunc)(struct BmpDecoder* This);
  63
  64 typedef struct BmpDecoder {
  65     const IWICBitmapDecoderVtbl *lpVtbl;
  66     const IWICBitmapFrameDecodeVtbl *lpFrameVtbl;
  67     LONG ref;
  68     BOOL initialized;
  69     IStream *stream;
  70     BITMAPFILEHEADER bfh;
  71     BITMAPV5HEADER bih;
  72     const WICPixelFormatGUID *pixelformat;
  73     int bitsperpixel;
  74     ReadDataFunc read_data_func;
  75     INT stride;
  76     BYTE *imagedata;
  77     BYTE *imagedatastart;
  78     CRITICAL_SECTION lock; /* must be held when initialized/imagedata is set or stream is accessed */
  79 } BmpDecoder;
  80
  81 static inline BmpDecoder *impl_from_frame(IWICBitmapFrameDecode *iface)
  82 {
  83     return CONTAINING_RECORD(iface, BmpDecoder, lpFrameVtbl);
  84 }
  85
  86 static HRESULT WINAPI BmpFrameDecode_QueryInterface(IWICBitmapFrameDecode *iface, REFIID iid,
  87     void **ppv)
  88 {
  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 = 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 BmpFrameDecode_AddRef(IWICBitmapFrameDecode *iface)
 110 {
 111     BmpDecoder *This = impl_from_frame(iface);
 112
 113     return IUnknown_AddRef((IUnknown*)This);
 114 }
 115
 116 static ULONG WINAPI BmpFrameDecode_Release(IWICBitmapFrameDecode *iface)
 117 {
 118     BmpDecoder *This = impl_from_frame(iface);
 119
 120     return IUnknown_Release((IUnknown*)This);
 121 }
 122
 123 static HRESULT WINAPI BmpFrameDecode_GetSize(IWICBitmapFrameDecode *iface,
 124     UINT *puiWidth, UINT *puiHeight)
 125 {
 126     BmpDecoder *This = impl_from_frame(iface);
 127     TRACE("(%p,%p,%p)\n", iface, puiWidth, puiHeight);
 128
 129     if (This->bih.bV5Size == sizeof(BITMAPCOREHEADER))
 130     {
 131         BITMAPCOREHEADER *bch = (BITMAPCOREHEADER*)&This->bih;
 132         *puiWidth = bch->bcWidth;
 133         *puiHeight = bch->bcHeight;
 134     }
 135     else
 136     {
 137         *puiWidth = This->bih.bV5Width;
 138         *puiHeight = abs(This->bih.bV5Height);
 139     }
 140     return S_OK;
 141 }
 142
 143 static HRESULT WINAPI BmpFrameDecode_GetPixelFormat(IWICBitmapFrameDecode *iface,
 144     WICPixelFormatGUID *pPixelFormat)
 145 {
 146     BmpDecoder *This = impl_from_frame(iface);
 147     TRACE("(%p,%p)\n", iface, pPixelFormat);
 148
 149     memcpy(pPixelFormat, This->pixelformat, sizeof(GUID));
 150
 151     return S_OK;
 152 }
 153
 154 static HRESULT BmpHeader_GetResolution(BITMAPV5HEADER *bih, double *pDpiX, double *pDpiY)
 155 {
 156     switch (bih->bV5Size)
 157     {
 158     case sizeof(BITMAPCOREHEADER):
 159         *pDpiX = 96.0;
 160         *pDpiY = 96.0;
 161         return S_OK;
 162     case sizeof(BITMAPCOREHEADER2):
 163     case sizeof(BITMAPINFOHEADER):
 164     case sizeof(BITMAPV4HEADER):
 165     case sizeof(BITMAPV5HEADER):
 166         *pDpiX = bih->bV5XPelsPerMeter * 0.0254;
 167         *pDpiY = bih->bV5YPelsPerMeter * 0.0254;
 168         return S_OK;
 169     default:
 170         return E_FAIL;
 171     }
 172 }
 173
 174 static HRESULT WINAPI BmpFrameDecode_GetResolution(IWICBitmapFrameDecode *iface,
 175     double *pDpiX, double *pDpiY)
 176 {
 177     BmpDecoder *This = impl_from_frame(iface);
 178     TRACE("(%p,%p,%p)\n", iface, pDpiX, pDpiY);
 179
 180     return BmpHeader_GetResolution(&This->bih, pDpiX, pDpiY);
 181 }
 182
 183 static HRESULT WINAPI BmpFrameDecode_CopyPalette(IWICBitmapFrameDecode *iface,
 184     IWICPalette *pIPalette)
 185 {
 186     HRESULT hr;
 187     BmpDecoder *This = impl_from_frame(iface);
 188     int count;
 189     WICColor *wiccolors=NULL;
 190     RGBTRIPLE *bgrcolors=NULL;
 191
 192     TRACE("(%p,%p)\n", iface, pIPalette);
 193
 194     EnterCriticalSection(&This->lock);
 195
 196     if (This->bih.bV5Size == sizeof(BITMAPCOREHEADER))
 197     {
 198         BITMAPCOREHEADER *bch = (BITMAPCOREHEADER*)&This->bih;
 199         if (bch->bcBitCount <= 8)
 200         {
 201             /* 2**n colors in BGR format after the header */
 202             ULONG tablesize, bytesread;
 203             LARGE_INTEGER offset;
 204             int i;
 205
 206             count = 1 << bch->bcBitCount;
 207             wiccolors = HeapAlloc(GetProcessHeap(), 0, sizeof(WICColor) * count);
 208             tablesize = sizeof(RGBTRIPLE) * count;
 209             bgrcolors = HeapAlloc(GetProcessHeap(), 0, tablesize);
 210             if (!wiccolors || !bgrcolors)
 211             {
 212                 hr = E_OUTOFMEMORY;
 213                 goto end;
 214             }
 215
 216             offset.QuadPart = sizeof(BITMAPFILEHEADER)+sizeof(BITMAPCOREHEADER);
 217             hr = IStream_Seek(This->stream, offset, STREAM_SEEK_SET, NULL);
 218             if (FAILED(hr)) goto end;
 219
 220             hr = IStream_Read(This->stream, bgrcolors, tablesize, &bytesread);
 221             if (FAILED(hr)) goto end;
 222             if (bytesread != tablesize) {
 223                 hr = E_FAIL;
 224                 goto end;
 225             }
 226
 227             for (i=0; i<count; i++)
 228             {
 229                 wiccolors[i] = 0xff000000|
 230                                (bgrcolors[i].rgbtRed<<16)|
 231                                (bgrcolors[i].rgbtGreen<<8)|
 232                                bgrcolors[i].rgbtBlue;
 233             }
 234         }
 235         else
 236         {
 237             hr = WINCODEC_ERR_PALETTEUNAVAILABLE;
 238             goto end;
 239         }
 240     }
 241     else
 242     {
 243         if (This->bih.bV5BitCount <= 8)
 244         {
 245             ULONG tablesize, bytesread;
 246             LARGE_INTEGER offset;
 247             int i;
 248
 249             if (This->bih.bV5ClrUsed == 0)
 250                 count = 1 << This->bih.bV5BitCount;
 251             else
 252                 count = This->bih.bV5ClrUsed;
 253
 254             tablesize = sizeof(WICColor) * count;
 255             wiccolors = HeapAlloc(GetProcessHeap(), 0, tablesize);
 256             if (!wiccolors)
 257             {
 258                 hr = E_OUTOFMEMORY;
 259                 goto end;
 260             }
 261
 262             offset.QuadPart = sizeof(BITMAPFILEHEADER) + This->bih.bV5Size;
 263             hr = IStream_Seek(This->stream, offset, STREAM_SEEK_SET, NULL);
 264             if (FAILED(hr)) goto end;
 265
 266             hr = IStream_Read(This->stream, wiccolors, tablesize, &bytesread);
 267             if (FAILED(hr)) goto end;
 268             if (bytesread != tablesize) {
 269                 hr = E_FAIL;
 270                 goto end;
 271             }
 272
 273             /* convert from BGR to BGRA by setting alpha to 100% */
 274             for (i=0; i<count; i++)
 275                 wiccolors[i] |= 0xff000000;
 276         }
 277         else
 278         {
 279             hr = WINCODEC_ERR_PALETTEUNAVAILABLE;
 280             goto end;
 281         }
 282     }
 283
 284 end:
 285
 286     LeaveCriticalSection(&This->lock);
 287
 288     if (SUCCEEDED(hr))
 289         hr = IWICPalette_InitializeCustom(pIPalette, wiccolors, count);
 290
 291     HeapFree(GetProcessHeap(), 0, wiccolors);
 292     HeapFree(GetProcessHeap(), 0, bgrcolors);
 293     return hr;
 294 }
 295
 296 static HRESULT WINAPI BmpFrameDecode_CopyPixels(IWICBitmapFrameDecode *iface,
 297     const WICRect *prc, UINT cbStride, UINT cbBufferSize, BYTE *pbBuffer)
 298 {
 299     BmpDecoder *This = impl_from_frame(iface);
 300     HRESULT hr=S_OK;
 301     UINT width, height;
 302     TRACE("(%p,%p,%u,%u,%p)\n", iface, prc, cbStride, cbBufferSize, pbBuffer);
 303
 304     EnterCriticalSection(&This->lock);
 305     if (!This->imagedata)
 306     {
 307         hr = This->read_data_func(This);
 308     }
 309     LeaveCriticalSection(&This->lock);
 310     if (FAILED(hr)) return hr;
 311
 312     hr = BmpFrameDecode_GetSize(iface, &width, &height);
 313     if (FAILED(hr)) return hr;
 314
 315     return copy_pixels(This->bitsperpixel, This->imagedatastart,
 316         width, height, This->stride,
 317         prc, cbStride, cbBufferSize, pbBuffer);
 318 }
 319
 320 static HRESULT WINAPI BmpFrameDecode_GetMetadataQueryReader(IWICBitmapFrameDecode *iface,
 321     IWICMetadataQueryReader **ppIMetadataQueryReader)
 322 {
 323     TRACE("(%p,%p)\n", iface, ppIMetadataQueryReader);
 324     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 325 }
 326
 327 static HRESULT WINAPI BmpFrameDecode_GetColorContexts(IWICBitmapFrameDecode *iface,
 328     UINT cCount, IWICColorContext **ppIColorContexts, UINT *pcActualCount)
 329 {
 330     TRACE("(%p,%u,%p,%p)\n", iface, cCount, ppIColorContexts, pcActualCount);
 331     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 332 }
 333
 334 static HRESULT WINAPI BmpFrameDecode_GetThumbnail(IWICBitmapFrameDecode *iface,
 335     IWICBitmapSource **ppIThumbnail)
 336 {
 337     TRACE("(%p,%p)\n", iface, ppIThumbnail);
 338     return WINCODEC_ERR_CODECNOTHUMBNAIL;
 339 }
 340
 341 static HRESULT BmpFrameDecode_ReadUncompressed(BmpDecoder* This)
 342 {
 343     UINT bytesperrow;
 344     UINT width, height;
 345     UINT datasize;
 346     int bottomup;
 347     HRESULT hr;
 348     LARGE_INTEGER offbits;
 349     ULONG bytesread;
 350
 351     if (This->bih.bV5Size == sizeof(BITMAPCOREHEADER))
 352     {
 353         BITMAPCOREHEADER *bch = (BITMAPCOREHEADER*)&This->bih;
 354         width = bch->bcWidth;
 355         height = bch->bcHeight;
 356         bottomup = 1;
 357     }
 358     else
 359     {
 360         width = This->bih.bV5Width;
 361         height = abs(This->bih.bV5Height);
 362         bottomup = (This->bih.bV5Height > 0);
 363     }
 364
 365     /* row sizes in BMP files must be divisible by 4 bytes */
 366     bytesperrow = (((width * This->bitsperpixel)+31)/32)*4;
 367     datasize = bytesperrow * height;
 368
 369     This->imagedata = HeapAlloc(GetProcessHeap(), 0, datasize);
 370     if (!This->imagedata) return E_OUTOFMEMORY;
 371
 372     offbits.QuadPart = This->bfh.bfOffBits;
 373     hr = IStream_Seek(This->stream, offbits, STREAM_SEEK_SET, NULL);
 374     if (FAILED(hr)) goto fail;
 375
 376     hr = IStream_Read(This->stream, This->imagedata, datasize, &bytesread);
 377     if (FAILED(hr) || bytesread != datasize) goto fail;
 378
 379     if (bottomup)
 380     {
 381         This->imagedatastart = This->imagedata + (height-1) * bytesperrow;
 382         This->stride = -bytesperrow;
 383     }
 384     else
 385     {
 386         This->imagedatastart = This->imagedata;
 387         This->stride = bytesperrow;
 388     }
 389     return S_OK;
 390
 391 fail:
 392     HeapFree(GetProcessHeap(), 0, This->imagedata);
 393     This->imagedata = NULL;
 394     if (SUCCEEDED(hr)) hr = E_FAIL;
 395     return hr;
 396 }
 397
 398 static HRESULT BmpFrameDecode_ReadRLE8(BmpDecoder* This)
 399 {
 400     UINT bytesperrow;
 401     UINT width, height;
 402     BYTE *rledata, *cursor, *rledataend;
 403     UINT rlesize, datasize, palettesize;
 404     DWORD palette[256];
 405     UINT x, y;
 406     DWORD *bgrdata;
 407     HRESULT hr;
 408     LARGE_INTEGER offbits;
 409     ULONG bytesread;
 410
 411     width = This->bih.bV5Width;
 412     height = abs(This->bih.bV5Height);
 413     bytesperrow = width * 4;
 414     datasize = bytesperrow * height;
 415     rlesize = This->bih.bV5SizeImage;
 416     if (This->bih.bV5ClrUsed && This->bih.bV5ClrUsed < 256)
 417         palettesize = 4 * This->bih.bV5ClrUsed;
 418     else
 419         palettesize = 4 * 256;
 420
 421     rledata = HeapAlloc(GetProcessHeap(), 0, rlesize);
 422     This->imagedata = HeapAlloc(GetProcessHeap(), 0, datasize);
 423     if (!This->imagedata || !rledata)
 424     {
 425         hr = E_OUTOFMEMORY;
 426         goto fail;
 427     }
 428
 429     /* read palette */
 430     offbits.QuadPart = sizeof(BITMAPFILEHEADER) + This->bih.bV5Size;
 431     hr = IStream_Seek(This->stream, offbits, STREAM_SEEK_SET, NULL);
 432     if (FAILED(hr)) goto fail;
 433
 434     hr = IStream_Read(This->stream, palette, palettesize, &bytesread);
 435     if (FAILED(hr) || bytesread != palettesize) goto fail;
 436
 437     /* read RLE data */
 438     offbits.QuadPart = This->bfh.bfOffBits;
 439     hr = IStream_Seek(This->stream, offbits, STREAM_SEEK_SET, NULL);
 440     if (FAILED(hr)) goto fail;
 441
 442     hr = IStream_Read(This->stream, rledata, rlesize, &bytesread);
 443     if (FAILED(hr) || bytesread != rlesize) goto fail;
 444
 445     /* decode RLE */
 446     bgrdata = (DWORD*)This->imagedata;
 447     x = 0;
 448     y = 0;
 449     rledataend = rledata + rlesize;
 450     cursor = rledata;
 451     while (cursor < rledataend && y < height)
 452     {
 453         BYTE length = *cursor++;
 454         if (length == 0)
 455         {
 456             /* escape code */
 457             BYTE escape = *cursor++;
 458             switch(escape)
 459             {
 460             case 0: /* end of line */
 461                 x = 0;
 462                 y++;
 463                 break;
 464             case 1: /* end of bitmap */
 465                 goto end;
 466             case 2: /* delta */
 467                 if (cursor < rledataend)
 468                 {
 469                     x += *cursor++;
 470                     y += *cursor++;
 471                 }
 472                 break;
 473             default: /* absolute mode */
 474                 length = escape;
 475                 while (cursor < rledataend && length-- && x < width)
 476                     bgrdata[y*width + x++] = palette[*cursor++];
 477                 if (escape & 1) cursor++; /* skip pad byte */
 478             }
 479         }
 480         else
 481         {
 482             DWORD color = palette[*cursor++];
 483             while (length-- && x < width)
 484                 bgrdata[y*width + x++] = color;
 485         }
 486     }
 487
 488 end:
 489     HeapFree(GetProcessHeap(), 0, rledata);
 490
 491     This->imagedatastart = This->imagedata + (height-1) * bytesperrow;
 492     This->stride = -bytesperrow;
 493
 494     return S_OK;
 495
 496 fail:
 497     HeapFree(GetProcessHeap(), 0, rledata);
 498     HeapFree(GetProcessHeap(), 0, This->imagedata);
 499     This->imagedata = NULL;
 500     if (SUCCEEDED(hr)) hr = E_FAIL;
 501     return hr;
 502 }
 503
 504 static HRESULT BmpFrameDecode_ReadRLE4(BmpDecoder* This)
 505 {
 506     UINT bytesperrow;
 507     UINT width, height;
 508     BYTE *rledata, *cursor, *rledataend;
 509     UINT rlesize, datasize, palettesize;
 510     DWORD palette[16];
 511     UINT x, y;
 512     DWORD *bgrdata;
 513     HRESULT hr;
 514     LARGE_INTEGER offbits;
 515     ULONG bytesread;
 516
 517     width = This->bih.bV5Width;
 518     height = abs(This->bih.bV5Height);
 519     bytesperrow = width * 4;
 520     datasize = bytesperrow * height;
 521     rlesize = This->bih.bV5SizeImage;
 522     if (This->bih.bV5ClrUsed && This->bih.bV5ClrUsed < 16)
 523         palettesize = 4 * This->bih.bV5ClrUsed;
 524     else
 525         palettesize = 4 * 16;
 526
 527     rledata = HeapAlloc(GetProcessHeap(), 0, rlesize);
 528     This->imagedata = HeapAlloc(GetProcessHeap(), 0, datasize);
 529     if (!This->imagedata || !rledata)
 530     {
 531         hr = E_OUTOFMEMORY;
 532         goto fail;
 533     }
 534
 535     /* read palette */
 536     offbits.QuadPart = sizeof(BITMAPFILEHEADER) + This->bih.bV5Size;
 537     hr = IStream_Seek(This->stream, offbits, STREAM_SEEK_SET, NULL);
 538     if (FAILED(hr)) goto fail;
 539
 540     hr = IStream_Read(This->stream, palette, palettesize, &bytesread);
 541     if (FAILED(hr) || bytesread != palettesize) goto fail;
 542
 543     /* read RLE data */
 544     offbits.QuadPart = This->bfh.bfOffBits;
 545     hr = IStream_Seek(This->stream, offbits, STREAM_SEEK_SET, NULL);
 546     if (FAILED(hr)) goto fail;
 547
 548     hr = IStream_Read(This->stream, rledata, rlesize, &bytesread);
 549     if (FAILED(hr) || bytesread != rlesize) goto fail;
 550
 551     /* decode RLE */
 552     bgrdata = (DWORD*)This->imagedata;
 553     x = 0;
 554     y = 0;
 555     rledataend = rledata + rlesize;
 556     cursor = rledata;
 557     while (cursor < rledataend && y < height)
 558     {
 559         BYTE length = *cursor++;
 560         if (length == 0)
 561         {
 562             /* escape code */
 563             BYTE escape = *cursor++;
 564             switch(escape)
 565             {
 566             case 0: /* end of line */
 567                 x = 0;
 568                 y++;
 569                 break;
 570             case 1: /* end of bitmap */
 571                 goto end;
 572             case 2: /* delta */
 573                 if (cursor < rledataend)
 574                 {
 575                     x += *cursor++;
 576                     y += *cursor++;
 577                 }
 578                 break;
 579             default: /* absolute mode */
 580                 length = escape;
 581                 while (cursor < rledataend && length-- && x < width)
 582                 {
 583                     BYTE colors = *cursor++;
 584                     bgrdata[y*width + x++] = palette[colors>>4];
 585                     if (length-- && x < width)
 586                         bgrdata[y*width + x++] = palette[colors&0xf];
 587                     else
 588                         break;
 589                 }
 590                 if ((cursor - rledata) & 1) cursor++; /* skip pad byte */
 591             }
 592         }
 593         else
 594         {
 595             BYTE colors = *cursor++;
 596             DWORD color1 = palette[colors>>4];
 597             DWORD color2 = palette[colors&0xf];
 598             while (length-- && x < width)
 599             {
 600                 bgrdata[y*width + x++] = color1;
 601                 if (length-- && x < width)
 602                     bgrdata[y*width + x++] = color2;
 603                 else
 604                     break;
 605             }
 606         }
 607     }
 608
 609 end:
 610     HeapFree(GetProcessHeap(), 0, rledata);
 611
 612     This->imagedatastart = This->imagedata + (height-1) * bytesperrow;
 613     This->stride = -bytesperrow;
 614
 615     return S_OK;
 616
 617 fail:
 618     HeapFree(GetProcessHeap(), 0, rledata);
 619     HeapFree(GetProcessHeap(), 0, This->imagedata);
 620     This->imagedata = NULL;
 621     if (SUCCEEDED(hr)) hr = E_FAIL;
 622     return hr;
 623 }
 624
 625 static HRESULT BmpFrameDecode_ReadUnsupported(BmpDecoder* This)
 626 {
 627     return E_FAIL;
 628 }
 629
 630 struct bitfields_format {
 631     WORD bitcount; /* 0 for end of list */
 632     DWORD redmask;
 633     DWORD greenmask;
 634     DWORD bluemask;
 635     DWORD alphamask;
 636     const WICPixelFormatGUID *pixelformat;
 637     ReadDataFunc read_data_func;
 638 };
 639
 640 static const struct bitfields_format bitfields_formats[] = {
 641     {16,0x7c00,0x3e0,0x1f,0,&GUID_WICPixelFormat16bppBGR555,BmpFrameDecode_ReadUncompressed},
 642     {16,0xf800,0x7e0,0x1f,0,&GUID_WICPixelFormat16bppBGR565,BmpFrameDecode_ReadUncompressed},
 643     {32,0xff0000,0xff00,0xff,0,&GUID_WICPixelFormat32bppBGR,BmpFrameDecode_ReadUncompressed},
 644     {32,0xff0000,0xff00,0xff,0xff000000,&GUID_WICPixelFormat32bppBGRA,BmpFrameDecode_ReadUncompressed},
 645     {0}
 646 };
 647
 648 static const IWICBitmapFrameDecodeVtbl BmpDecoder_FrameVtbl = {
 649     BmpFrameDecode_QueryInterface,
 650     BmpFrameDecode_AddRef,
 651     BmpFrameDecode_Release,
 652     BmpFrameDecode_GetSize,
 653     BmpFrameDecode_GetPixelFormat,
 654     BmpFrameDecode_GetResolution,
 655     BmpFrameDecode_CopyPalette,
 656     BmpFrameDecode_CopyPixels,
 657     BmpFrameDecode_GetMetadataQueryReader,
 658     BmpFrameDecode_GetColorContexts,
 659     BmpFrameDecode_GetThumbnail
 660 };
 661
 662 static HRESULT BmpDecoder_ReadHeaders(BmpDecoder* This, IStream *stream)
 663 {
 664     HRESULT hr;
 665     ULONG bytestoread, bytesread;
 666     LARGE_INTEGER seek;
 667
 668     if (This->initialized) return WINCODEC_ERR_WRONGSTATE;
 669
 670     seek.QuadPart = 0;
 671     hr = IStream_Seek(stream, seek, STREAM_SEEK_SET, NULL);
 672     if (FAILED(hr)) return hr;
 673
 674     hr = IStream_Read(stream, &This->bfh, sizeof(BITMAPFILEHEADER), &bytesread);
 675     if (FAILED(hr)) return hr;
 676     if (bytesread != sizeof(BITMAPFILEHEADER) ||
 677         This->bfh.bfType != 0x4d42 /* "BM" */) return E_FAIL;
 678
 679     hr = IStream_Read(stream, &This->bih.bV5Size, sizeof(DWORD), &bytesread);
 680     if (FAILED(hr)) return hr;
 681     if (bytesread != sizeof(DWORD) ||
 682         (This->bih.bV5Size != sizeof(BITMAPCOREHEADER) &&
 683          This->bih.bV5Size != sizeof(BITMAPCOREHEADER2) &&
 684          This->bih.bV5Size != sizeof(BITMAPINFOHEADER) &&
 685          This->bih.bV5Size != sizeof(BITMAPV4HEADER) &&
 686          This->bih.bV5Size != sizeof(BITMAPV5HEADER))) return E_FAIL;
 687
 688     bytestoread = This->bih.bV5Size-sizeof(DWORD);
 689     hr = IStream_Read(stream, &This->bih.bV5Width, bytestoread, &bytesread);
 690     if (FAILED(hr)) return hr;
 691     if (bytestoread != bytesread) return E_FAIL;
 692
 693     /* if this is a BITMAPINFOHEADER with BI_BITFIELDS compression, we need to
 694         read the extra fields */
 695     if (This->bih.bV5Size == sizeof(BITMAPINFOHEADER) &&
 696         This->bih.bV5Compression == BI_BITFIELDS)
 697     {
 698         hr = IStream_Read(stream, &This->bih.bV5RedMask, 12, &bytesread);
 699         if (FAILED(hr)) return hr;
 700         if (bytesread != 12) return E_FAIL;
 701         This->bih.bV5AlphaMask = 0;
 702     }
 703
 704     /* decide what kind of bitmap this is and how/if we can read it */
 705     if (This->bih.bV5Size == sizeof(BITMAPCOREHEADER))
 706     {
 707         BITMAPCOREHEADER *bch = (BITMAPCOREHEADER*)&This->bih;
 708         TRACE("BITMAPCOREHEADER with depth=%i\n", bch->bcBitCount);
 709         This->bitsperpixel = bch->bcBitCount;
 710         This->read_data_func = BmpFrameDecode_ReadUncompressed;
 711         switch(bch->bcBitCount)
 712         {
 713         case 1:
 714             This->pixelformat = &GUID_WICPixelFormat1bppIndexed;
 715             break;
 716         case 2:
 717             This->pixelformat = &GUID_WICPixelFormat2bppIndexed;
 718             break;
 719         case 4:
 720             This->pixelformat = &GUID_WICPixelFormat4bppIndexed;
 721             break;
 722         case 8:
 723             This->pixelformat = &GUID_WICPixelFormat8bppIndexed;
 724             break;
 725         case 24:
 726             This->pixelformat = &GUID_WICPixelFormat24bppBGR;
 727             break;
 728         default:
 729             This->pixelformat = &GUID_WICPixelFormatUndefined;
 730             WARN("unsupported bit depth %i for BITMAPCOREHEADER\n", bch->bcBitCount);
 731             break;
 732         }
 733     }
 734     else /* struct is compatible with BITMAPINFOHEADER */
 735     {
 736         TRACE("bitmap header=%i compression=%i depth=%i\n", This->bih.bV5Size, This->bih.bV5Compression, This->bih.bV5BitCount);
 737         switch(This->bih.bV5Compression)
 738         {
 739         case BI_RGB:
 740             This->bitsperpixel = This->bih.bV5BitCount;
 741             This->read_data_func = BmpFrameDecode_ReadUncompressed;
 742             switch(This->bih.bV5BitCount)
 743             {
 744             case 1:
 745                 This->pixelformat = &GUID_WICPixelFormat1bppIndexed;
 746                 break;
 747             case 2:
 748                 This->pixelformat = &GUID_WICPixelFormat2bppIndexed;
 749                 break;
 750             case 4:
 751                 This->pixelformat = &GUID_WICPixelFormat4bppIndexed;
 752                 break;
 753             case 8:
 754                 This->pixelformat = &GUID_WICPixelFormat8bppIndexed;
 755                 break;
 756             case 16:
 757                 This->pixelformat = &GUID_WICPixelFormat16bppBGR555;
 758                 break;
 759             case 24:
 760                 This->pixelformat = &GUID_WICPixelFormat24bppBGR;
 761                 break;
 762             case 32:
 763                 This->pixelformat = &GUID_WICPixelFormat32bppBGR;
 764                 break;
 765             default:
 766                 This->pixelformat = &GUID_WICPixelFormatUndefined;
 767                 FIXME("unsupported bit depth %i for uncompressed RGB\n", This->bih.bV5BitCount);
 768             }
 769             break;
 770         case BI_RLE8:
 771             This->bitsperpixel = 32;
 772             This->read_data_func = BmpFrameDecode_ReadRLE8;
 773             This->pixelformat = &GUID_WICPixelFormat32bppBGR;
 774             break;
 775         case BI_RLE4:
 776             This->bitsperpixel = 32;
 777             This->read_data_func = BmpFrameDecode_ReadRLE4;
 778             This->pixelformat = &GUID_WICPixelFormat32bppBGR;
 779             break;
 780         case BI_BITFIELDS:
 781         {
 782             const struct bitfields_format *format;
 783             if (This->bih.bV5Size == sizeof(BITMAPCOREHEADER2))
 784             {
 785                 /* BCH2 doesn't support bitfields; this is Huffman 1D compression */
 786                 This->bitsperpixel = 0;
 787                 This->read_data_func = BmpFrameDecode_ReadUnsupported;
 788                 This->pixelformat = &GUID_WICPixelFormatUndefined;
 789                 FIXME("Huffman 1D compression is unsupported\n");
 790                 break;
 791             }
 792             This->bitsperpixel = This->bih.bV5BitCount;
 793             for (format = bitfields_formats; format->bitcount; format++)
 794             {
 795                 if ((format->bitcount == This->bih.bV5BitCount) &&
 796                     (format->redmask == This->bih.bV5RedMask) &&
 797                     (format->greenmask == This->bih.bV5GreenMask) &&
 798                     (format->bluemask == This->bih.bV5BlueMask) &&
 799                     (format->alphamask == This->bih.bV5AlphaMask))
 800                 {
 801                     This->read_data_func = format->read_data_func;
 802                     This->pixelformat = format->pixelformat;
 803                     break;
 804                 }
 805             }
 806             if (!format->bitcount)
 807             {
 808                 This->read_data_func = BmpFrameDecode_ReadUncompressed;
 809                 This->pixelformat = &GUID_WICPixelFormatUndefined;
 810                 FIXME("unsupported bitfields type depth=%i red=%x green=%x blue=%x alpha=%x\n",
 811                     This->bih.bV5BitCount, This->bih.bV5RedMask, This->bih.bV5GreenMask, This->bih.bV5BlueMask, This->bih.bV5AlphaMask);
 812             }
 813             break;
 814         }
 815         default:
 816             This->bitsperpixel = 0;
 817             This->read_data_func = BmpFrameDecode_ReadUnsupported;
 818             This->pixelformat = &GUID_WICPixelFormatUndefined;
 819             FIXME("unsupported bitmap type header=%i compression=%i depth=%i\n", This->bih.bV5Size, This->bih.bV5Compression, This->bih.bV5BitCount);
 820             break;
 821         }
 822     }
 823
 824     This->initialized = TRUE;
 825
 826     return S_OK;
 827 }
 828
 829 static HRESULT WINAPI BmpDecoder_QueryInterface(IWICBitmapDecoder *iface, REFIID iid,
 830     void **ppv)
 831 {
 832     BmpDecoder *This = (BmpDecoder*)iface;
 833     TRACE("(%p,%s,%p)\n", iface, debugstr_guid(iid), ppv);
 834
 835     if (!ppv) return E_INVALIDARG;
 836
 837     if (IsEqualIID(&IID_IUnknown, iid) || IsEqualIID(&IID_IWICBitmapDecoder, iid))
 838     {
 839         *ppv = This;
 840     }
 841     else
 842     {
 843         *ppv = NULL;
 844         return E_NOINTERFACE;
 845     }
 846
 847     IUnknown_AddRef((IUnknown*)*ppv);
 848     return S_OK;
 849 }
 850
 851 static ULONG WINAPI BmpDecoder_AddRef(IWICBitmapDecoder *iface)
 852 {
 853     BmpDecoder *This = (BmpDecoder*)iface;
 854     ULONG ref = InterlockedIncrement(&This->ref);
 855
 856     TRACE("(%p) refcount=%u\n", iface, ref);
 857
 858     return ref;
 859 }
 860
 861 static ULONG WINAPI BmpDecoder_Release(IWICBitmapDecoder *iface)
 862 {
 863     BmpDecoder *This = (BmpDecoder*)iface;
 864     ULONG ref = InterlockedDecrement(&This->ref);
 865
 866     TRACE("(%p) refcount=%u\n", iface, ref);
 867
 868     if (ref == 0)
 869     {
 870         if (This->stream) IStream_Release(This->stream);
 871         HeapFree(GetProcessHeap(), 0, This->imagedata);
 872         This->lock.DebugInfo->Spare[0] = 0;
 873         DeleteCriticalSection(&This->lock);
 874         HeapFree(GetProcessHeap(), 0, This);
 875     }
 876
 877     return ref;
 878 }
 879
 880 static HRESULT WINAPI BmpDecoder_QueryCapability(IWICBitmapDecoder *iface, IStream *pIStream,
 881     DWORD *pdwCapability)
 882 {
 883     HRESULT hr;
 884     BmpDecoder *This = (BmpDecoder*)iface;
 885
 886     EnterCriticalSection(&This->lock);
 887     hr = BmpDecoder_ReadHeaders(This, pIStream);
 888     LeaveCriticalSection(&This->lock);
 889     if (FAILED(hr)) return hr;
 890
 891     if (This->read_data_func == BmpFrameDecode_ReadUnsupported)
 892         *pdwCapability = 0;
 893     else
 894         *pdwCapability = WICBitmapDecoderCapabilityCanDecodeAllImages;
 895
 896     return S_OK;
 897 }
 898
 899 static HRESULT WINAPI BmpDecoder_Initialize(IWICBitmapDecoder *iface, IStream *pIStream,
 900     WICDecodeOptions cacheOptions)
 901 {
 902     HRESULT hr;
 903     BmpDecoder *This = (BmpDecoder*)iface;
 904
 905     EnterCriticalSection(&This->lock);
 906     hr = BmpDecoder_ReadHeaders(This, pIStream);
 907
 908     if (SUCCEEDED(hr))
 909     {
 910         This->stream = pIStream;
 911         IStream_AddRef(pIStream);
 912     }
 913     LeaveCriticalSection(&This->lock);
 914
 915     return hr;
 916 }
 917
 918 static HRESULT WINAPI BmpDecoder_GetContainerFormat(IWICBitmapDecoder *iface,
 919     GUID *pguidContainerFormat)
 920 {
 921     memcpy(pguidContainerFormat, &GUID_ContainerFormatBmp, sizeof(GUID));
 922     return S_OK;
 923 }
 924
 925 static HRESULT WINAPI BmpDecoder_GetDecoderInfo(IWICBitmapDecoder *iface,
 926     IWICBitmapDecoderInfo **ppIDecoderInfo)
 927 {
 928     HRESULT hr;
 929     IWICComponentInfo *compinfo;
 930
 931     TRACE("(%p,%p)\n", iface, ppIDecoderInfo);
 932
 933     hr = CreateComponentInfo(&CLSID_WICBmpDecoder, &compinfo);
 934     if (FAILED(hr)) return hr;
 935
 936     hr = IWICComponentInfo_QueryInterface(compinfo, &IID_IWICBitmapDecoderInfo,
 937         (void**)ppIDecoderInfo);
 938
 939     IWICComponentInfo_Release(compinfo);
 940
 941     return hr;
 942 }
 943
 944 static HRESULT WINAPI BmpDecoder_CopyPalette(IWICBitmapDecoder *iface,
 945     IWICPalette *pIPalette)
 946 {
 947     TRACE("(%p,%p)\n", iface, pIPalette);
 948
 949     return WINCODEC_ERR_PALETTEUNAVAILABLE;
 950 }
 951
 952 static HRESULT WINAPI BmpDecoder_GetMetadataQueryReader(IWICBitmapDecoder *iface,
 953     IWICMetadataQueryReader **ppIMetadataQueryReader)
 954 {
 955     TRACE("(%p,%p)\n", iface, ppIMetadataQueryReader);
 956     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 957 }
 958
 959 static HRESULT WINAPI BmpDecoder_GetPreview(IWICBitmapDecoder *iface,
 960     IWICBitmapSource **ppIBitmapSource)
 961 {
 962     TRACE("(%p,%p)\n", iface, ppIBitmapSource);
 963     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 964 }
 965
 966 static HRESULT WINAPI BmpDecoder_GetColorContexts(IWICBitmapDecoder *iface,
 967     UINT cCount, IWICColorContext **ppIColorContexts, UINT *pcActualCount)
 968 {
 969     TRACE("(%p,%u,%p,%p)\n", iface, cCount, ppIColorContexts, pcActualCount);
 970     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 971 }
 972
 973 static HRESULT WINAPI BmpDecoder_GetThumbnail(IWICBitmapDecoder *iface,
 974     IWICBitmapSource **ppIThumbnail)
 975 {
 976     TRACE("(%p,%p)\n", iface, ppIThumbnail);
 977     return WINCODEC_ERR_CODECNOTHUMBNAIL;
 978 }
 979
 980 static HRESULT WINAPI BmpDecoder_GetFrameCount(IWICBitmapDecoder *iface,
 981     UINT *pCount)
 982 {
 983     *pCount = 1;
 984     return S_OK;
 985 }
 986
 987 static HRESULT WINAPI BmpDecoder_GetFrame(IWICBitmapDecoder *iface,
 988     UINT index, IWICBitmapFrameDecode **ppIBitmapFrame)
 989 {
 990     BmpDecoder *This = (BmpDecoder*)iface;
 991
 992     if (index != 0) return E_INVALIDARG;
 993
 994     if (!This->stream) return WINCODEC_ERR_WRONGSTATE;
 995
 996     *ppIBitmapFrame = (IWICBitmapFrameDecode*)&This->lpFrameVtbl;
 997     IWICBitmapDecoder_AddRef(iface);
 998
 999     return S_OK;
1000 }
1001
1002 static const IWICBitmapDecoderVtbl BmpDecoder_Vtbl = {
1003     BmpDecoder_QueryInterface,
1004     BmpDecoder_AddRef,
1005     BmpDecoder_Release,
1006     BmpDecoder_QueryCapability,
1007     BmpDecoder_Initialize,
1008     BmpDecoder_GetContainerFormat,
1009     BmpDecoder_GetDecoderInfo,
1010     BmpDecoder_CopyPalette,
1011     BmpDecoder_GetMetadataQueryReader,
1012     BmpDecoder_GetPreview,
1013     BmpDecoder_GetColorContexts,
1014     BmpDecoder_GetThumbnail,
1015     BmpDecoder_GetFrameCount,
1016     BmpDecoder_GetFrame
1017 };
1018
1019 HRESULT BmpDecoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv)
1020 {
1021     BmpDecoder *This;
1022     HRESULT ret;
1023
1024     TRACE("(%p,%s,%p)\n", pUnkOuter, debugstr_guid(iid), ppv);
1025
1026     *ppv = NULL;
1027
1028     if (pUnkOuter) return CLASS_E_NOAGGREGATION;
1029
1030     This = HeapAlloc(GetProcessHeap(), 0, sizeof(BmpDecoder));
1031     if (!This) return E_OUTOFMEMORY;
1032
1033     This->lpVtbl = &BmpDecoder_Vtbl;
1034     This->lpFrameVtbl = &BmpDecoder_FrameVtbl;
1035     This->ref = 1;
1036     This->initialized = FALSE;
1037     This->stream = NULL;
1038     This->imagedata = NULL;
1039     InitializeCriticalSection(&This->lock);
1040     This->lock.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": BmpDecoder.lock");
1041
1042     ret = IUnknown_QueryInterface((IUnknown*)This, iid, ppv);
1043     IUnknown_Release((IUnknown*)This);
1044
1045     return ret;
1046 }