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 <assert.h>
  22 #include <stdarg.h>
  23
  24 #define COBJMACROS
  25
  26 #include "windef.h"
  27 #include "winbase.h"
  28 #include "winreg.h"
  29 #include "wingdi.h"
  30 #include "objbase.h"
  31 #include "wincodec.h"
  32
  33 #include "wincodecs_private.h"
  34
  35 #include "wine/debug.h"
  36
  37 WINE_DEFAULT_DEBUG_CHANNEL(wincodecs);
  38
  39 typedef struct {
  40     DWORD bc2Size;
  41     DWORD bc2Width;
  42     DWORD bc2Height;
  43     WORD  bc2Planes;
  44     WORD  bc2BitCount;
  45     DWORD bc2Compression;
  46     DWORD bc2SizeImage;
  47     DWORD bc2XRes;
  48     DWORD bc2YRes;
  49     DWORD bc2ClrUsed;
  50     DWORD bc2ClrImportant;
  51     /* same as BITMAPINFOHEADER until this point */
  52     WORD  bc2ResUnit;
  53     WORD  bc2Reserved;
  54     WORD  bc2Orientation;
  55     WORD  bc2Halftoning;
  56     DWORD bc2HalftoneSize1;
  57     DWORD bc2HalftoneSize2;
  58     DWORD bc2ColorSpace;
  59     DWORD bc2AppData;
  60 } BITMAPCOREHEADER2;
  61
  62 struct BmpDecoder;
  63 typedef HRESULT (*ReadDataFunc)(struct BmpDecoder* This);
  64
  65 typedef struct BmpDecoder {
  66     const IWICBitmapDecoderVtbl *lpVtbl;
  67     const IWICBitmapFrameDecodeVtbl *lpFrameVtbl;
  68     LONG ref;
  69     BOOL initialized;
  70     IStream *stream;
  71     ULONG palette_offset;
  72     ULONG image_offset;
  73     BITMAPV5HEADER bih;
  74     const WICPixelFormatGUID *pixelformat;
  75     int bitsperpixel;
  76     ReadDataFunc read_data_func;
  77     INT stride;
  78     BYTE *imagedata;
  79     BYTE *imagedatastart;
  80     CRITICAL_SECTION lock; /* must be held when initialized/imagedata is set or stream is accessed */
  81     int packed; /* If TRUE, don't look for a file header and assume a packed DIB. */
  82     int icoframe; /* If TRUE, this is a frame of a .ico file. */
  83 } BmpDecoder;
  84
  85 static inline BmpDecoder *impl_from_frame(IWICBitmapFrameDecode *iface)
  86 {
  87     return CONTAINING_RECORD(iface, BmpDecoder, lpFrameVtbl);
  88 }
  89
  90 static HRESULT WINAPI BmpFrameDecode_QueryInterface(IWICBitmapFrameDecode *iface, REFIID iid,
  91     void **ppv)
  92 {
  93     TRACE("(%p,%s,%p)\n", iface, debugstr_guid(iid), ppv);
  94
  95     if (!ppv) return E_INVALIDARG;
  96
  97     if (IsEqualIID(&IID_IUnknown, iid) ||
  98         IsEqualIID(&IID_IWICBitmapSource, iid) ||
  99         IsEqualIID(&IID_IWICBitmapFrameDecode, iid))
 100     {
 101         *ppv = iface;
 102     }
 103     else
 104     {
 105         *ppv = NULL;
 106         return E_NOINTERFACE;
 107     }
 108
 109     IUnknown_AddRef((IUnknown*)*ppv);
 110     return S_OK;
 111 }
 112
 113 static ULONG WINAPI BmpFrameDecode_AddRef(IWICBitmapFrameDecode *iface)
 114 {
 115     BmpDecoder *This = impl_from_frame(iface);
 116
 117     return IUnknown_AddRef((IUnknown*)This);
 118 }
 119
 120 static ULONG WINAPI BmpFrameDecode_Release(IWICBitmapFrameDecode *iface)
 121 {
 122     BmpDecoder *This = impl_from_frame(iface);
 123
 124     return IUnknown_Release((IUnknown*)This);
 125 }
 126
 127 static HRESULT WINAPI BmpFrameDecode_GetSize(IWICBitmapFrameDecode *iface,
 128     UINT *puiWidth, UINT *puiHeight)
 129 {
 130     BmpDecoder *This = impl_from_frame(iface);
 131     TRACE("(%p,%p,%p)\n", iface, puiWidth, puiHeight);
 132
 133     if (This->bih.bV5Size == sizeof(BITMAPCOREHEADER))
 134     {
 135         BITMAPCOREHEADER *bch = (BITMAPCOREHEADER*)&This->bih;
 136         *puiWidth = bch->bcWidth;
 137         *puiHeight = bch->bcHeight;
 138     }
 139     else
 140     {
 141         *puiWidth = This->bih.bV5Width;
 142         *puiHeight = abs(This->bih.bV5Height);
 143     }
 144     return S_OK;
 145 }
 146
 147 static HRESULT WINAPI BmpFrameDecode_GetPixelFormat(IWICBitmapFrameDecode *iface,
 148     WICPixelFormatGUID *pPixelFormat)
 149 {
 150     BmpDecoder *This = impl_from_frame(iface);
 151     TRACE("(%p,%p)\n", iface, pPixelFormat);
 152
 153     memcpy(pPixelFormat, This->pixelformat, sizeof(GUID));
 154
 155     return S_OK;
 156 }
 157
 158 static HRESULT BmpHeader_GetResolution(BITMAPV5HEADER *bih, double *pDpiX, double *pDpiY)
 159 {
 160     switch (bih->bV5Size)
 161     {
 162     case sizeof(BITMAPCOREHEADER):
 163         *pDpiX = 96.0;
 164         *pDpiY = 96.0;
 165         return S_OK;
 166     case sizeof(BITMAPCOREHEADER2):
 167     case sizeof(BITMAPINFOHEADER):
 168     case sizeof(BITMAPV4HEADER):
 169     case sizeof(BITMAPV5HEADER):
 170         *pDpiX = bih->bV5XPelsPerMeter * 0.0254;
 171         *pDpiY = bih->bV5YPelsPerMeter * 0.0254;
 172         return S_OK;
 173     default:
 174         return E_FAIL;
 175     }
 176 }
 177
 178 static HRESULT WINAPI BmpFrameDecode_GetResolution(IWICBitmapFrameDecode *iface,
 179     double *pDpiX, double *pDpiY)
 180 {
 181     BmpDecoder *This = impl_from_frame(iface);
 182     TRACE("(%p,%p,%p)\n", iface, pDpiX, pDpiY);
 183
 184     return BmpHeader_GetResolution(&This->bih, pDpiX, pDpiY);
 185 }
 186
 187 static HRESULT WINAPI BmpFrameDecode_CopyPalette(IWICBitmapFrameDecode *iface,
 188     IWICPalette *pIPalette)
 189 {
 190     HRESULT hr;
 191     BmpDecoder *This = impl_from_frame(iface);
 192     int count;
 193     WICColor *wiccolors=NULL;
 194     RGBTRIPLE *bgrcolors=NULL;
 195
 196     TRACE("(%p,%p)\n", iface, pIPalette);
 197
 198     EnterCriticalSection(&This->lock);
 199
 200     if (This->bih.bV5Size == sizeof(BITMAPCOREHEADER))
 201     {
 202         BITMAPCOREHEADER *bch = (BITMAPCOREHEADER*)&This->bih;
 203         if (bch->bcBitCount <= 8)
 204         {
 205             /* 2**n colors in BGR format after the header */
 206             ULONG tablesize, bytesread;
 207             LARGE_INTEGER offset;
 208             int i;
 209
 210             count = 1 << bch->bcBitCount;
 211             wiccolors = HeapAlloc(GetProcessHeap(), 0, sizeof(WICColor) * count);
 212             tablesize = sizeof(RGBTRIPLE) * count;
 213             bgrcolors = HeapAlloc(GetProcessHeap(), 0, tablesize);
 214             if (!wiccolors || !bgrcolors)
 215             {
 216                 hr = E_OUTOFMEMORY;
 217                 goto end;
 218             }
 219
 220             offset.QuadPart = This->palette_offset;
 221             hr = IStream_Seek(This->stream, offset, STREAM_SEEK_SET, NULL);
 222             if (FAILED(hr)) goto end;
 223
 224             hr = IStream_Read(This->stream, bgrcolors, tablesize, &bytesread);
 225             if (FAILED(hr)) goto end;
 226             if (bytesread != tablesize) {
 227                 hr = E_FAIL;
 228                 goto end;
 229             }
 230
 231             for (i=0; i<count; i++)
 232             {
 233                 wiccolors[i] = 0xff000000|
 234                                (bgrcolors[i].rgbtRed<<16)|
 235                                (bgrcolors[i].rgbtGreen<<8)|
 236                                bgrcolors[i].rgbtBlue;
 237             }
 238         }
 239         else
 240         {
 241             hr = WINCODEC_ERR_PALETTEUNAVAILABLE;
 242             goto end;
 243         }
 244     }
 245     else
 246     {
 247         if (This->bih.bV5BitCount <= 8)
 248         {
 249             ULONG tablesize, bytesread;
 250             LARGE_INTEGER offset;
 251             int i;
 252
 253             if (This->bih.bV5ClrUsed == 0)
 254                 count = 1 << This->bih.bV5BitCount;
 255             else
 256                 count = This->bih.bV5ClrUsed;
 257
 258             tablesize = sizeof(WICColor) * count;
 259             wiccolors = HeapAlloc(GetProcessHeap(), 0, tablesize);
 260             if (!wiccolors)
 261             {
 262                 hr = E_OUTOFMEMORY;
 263                 goto end;
 264             }
 265
 266             offset.QuadPart = This->palette_offset;
 267             hr = IStream_Seek(This->stream, offset, STREAM_SEEK_SET, NULL);
 268             if (FAILED(hr)) goto end;
 269
 270             hr = IStream_Read(This->stream, wiccolors, tablesize, &bytesread);
 271             if (FAILED(hr)) goto end;
 272             if (bytesread != tablesize) {
 273                 hr = E_FAIL;
 274                 goto end;
 275             }
 276
 277             /* convert from BGR to BGRA by setting alpha to 100% */
 278             for (i=0; i<count; i++)
 279                 wiccolors[i] |= 0xff000000;
 280         }
 281         else
 282         {
 283             hr = WINCODEC_ERR_PALETTEUNAVAILABLE;
 284             goto end;
 285         }
 286     }
 287
 288 end:
 289
 290     LeaveCriticalSection(&This->lock);
 291
 292     if (SUCCEEDED(hr))
 293         hr = IWICPalette_InitializeCustom(pIPalette, wiccolors, count);
 294
 295     HeapFree(GetProcessHeap(), 0, wiccolors);
 296     HeapFree(GetProcessHeap(), 0, bgrcolors);
 297     return hr;
 298 }
 299
 300 static HRESULT WINAPI BmpFrameDecode_CopyPixels(IWICBitmapFrameDecode *iface,
 301     const WICRect *prc, UINT cbStride, UINT cbBufferSize, BYTE *pbBuffer)
 302 {
 303     BmpDecoder *This = impl_from_frame(iface);
 304     HRESULT hr=S_OK;
 305     UINT width, height;
 306     TRACE("(%p,%p,%u,%u,%p)\n", iface, prc, cbStride, cbBufferSize, pbBuffer);
 307
 308     EnterCriticalSection(&This->lock);
 309     if (!This->imagedata)
 310     {
 311         hr = This->read_data_func(This);
 312     }
 313     LeaveCriticalSection(&This->lock);
 314     if (FAILED(hr)) return hr;
 315
 316     hr = BmpFrameDecode_GetSize(iface, &width, &height);
 317     if (FAILED(hr)) return hr;
 318
 319     return copy_pixels(This->bitsperpixel, This->imagedatastart,
 320         width, height, This->stride,
 321         prc, cbStride, cbBufferSize, pbBuffer);
 322 }
 323
 324 static HRESULT WINAPI BmpFrameDecode_GetMetadataQueryReader(IWICBitmapFrameDecode *iface,
 325     IWICMetadataQueryReader **ppIMetadataQueryReader)
 326 {
 327     TRACE("(%p,%p)\n", iface, ppIMetadataQueryReader);
 328     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 329 }
 330
 331 static HRESULT WINAPI BmpFrameDecode_GetColorContexts(IWICBitmapFrameDecode *iface,
 332     UINT cCount, IWICColorContext **ppIColorContexts, UINT *pcActualCount)
 333 {
 334     TRACE("(%p,%u,%p,%p)\n", iface, cCount, ppIColorContexts, pcActualCount);
 335     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 336 }
 337
 338 static HRESULT WINAPI BmpFrameDecode_GetThumbnail(IWICBitmapFrameDecode *iface,
 339     IWICBitmapSource **ppIThumbnail)
 340 {
 341     TRACE("(%p,%p)\n", iface, ppIThumbnail);
 342     return WINCODEC_ERR_CODECNOTHUMBNAIL;
 343 }
 344
 345 static HRESULT BmpFrameDecode_ReadUncompressed(BmpDecoder* This)
 346 {
 347     UINT bytesperrow;
 348     UINT width, height;
 349     UINT datasize;
 350     int bottomup;
 351     HRESULT hr;
 352     LARGE_INTEGER offbits;
 353     ULONG bytesread;
 354
 355     if (This->bih.bV5Size == sizeof(BITMAPCOREHEADER))
 356     {
 357         BITMAPCOREHEADER *bch = (BITMAPCOREHEADER*)&This->bih;
 358         width = bch->bcWidth;
 359         height = bch->bcHeight;
 360         bottomup = 1;
 361     }
 362     else
 363     {
 364         width = This->bih.bV5Width;
 365         height = abs(This->bih.bV5Height);
 366         bottomup = (This->bih.bV5Height > 0);
 367     }
 368
 369     /* row sizes in BMP files must be divisible by 4 bytes */
 370     bytesperrow = (((width * This->bitsperpixel)+31)/32)*4;
 371     datasize = bytesperrow * height;
 372
 373     This->imagedata = HeapAlloc(GetProcessHeap(), 0, datasize);
 374     if (!This->imagedata) return E_OUTOFMEMORY;
 375
 376     offbits.QuadPart = This->image_offset;
 377     hr = IStream_Seek(This->stream, offbits, STREAM_SEEK_SET, NULL);
 378     if (FAILED(hr)) goto fail;
 379
 380     hr = IStream_Read(This->stream, This->imagedata, datasize, &bytesread);
 381     if (FAILED(hr) || bytesread != datasize) goto fail;
 382
 383     if (bottomup)
 384     {
 385         This->imagedatastart = This->imagedata + (height-1) * bytesperrow;
 386         This->stride = -bytesperrow;
 387     }
 388     else
 389     {
 390         This->imagedatastart = This->imagedata;
 391         This->stride = bytesperrow;
 392     }
 393     return S_OK;
 394
 395 fail:
 396     HeapFree(GetProcessHeap(), 0, This->imagedata);
 397     This->imagedata = NULL;
 398     if (SUCCEEDED(hr)) hr = E_FAIL;
 399     return hr;
 400 }
 401
 402 static HRESULT ReadByte(IStream *stream, BYTE *buffer, ULONG buffer_size,
 403     ULONG *cursor, ULONG *bytesread, BYTE *result)
 404 {
 405     HRESULT hr=S_OK;
 406
 407     if (*bytesread == 0 || *cursor == *bytesread)
 408     {
 409         hr = IStream_Read(stream, buffer, buffer_size, bytesread);
 410         *cursor = 0;
 411     }
 412
 413     if (SUCCEEDED(hr))
 414     {
 415         if (*cursor < *bytesread)
 416             *result = buffer[(*cursor)++];
 417         else
 418             hr = E_FAIL;
 419     }
 420
 421     return hr;
 422 }
 423
 424 static HRESULT BmpFrameDecode_ReadRLE8(BmpDecoder* This)
 425 {
 426     UINT bytesperrow;
 427     UINT width, height;
 428     BYTE rledata[4096];
 429     UINT datasize, palettesize;
 430     DWORD palette[256];
 431     UINT x, y;
 432     DWORD *bgrdata;
 433     HRESULT hr;
 434     LARGE_INTEGER offbits;
 435     ULONG cursor=0, bytesread=0;
 436
 437     width = This->bih.bV5Width;
 438     height = abs(This->bih.bV5Height);
 439     bytesperrow = width * 4;
 440     datasize = bytesperrow * height;
 441     if (This->bih.bV5ClrUsed && This->bih.bV5ClrUsed < 256)
 442         palettesize = 4 * This->bih.bV5ClrUsed;
 443     else
 444         palettesize = 4 * 256;
 445
 446     This->imagedata = HeapAlloc(GetProcessHeap(), 0, datasize);
 447     if (!This->imagedata)
 448     {
 449         hr = E_OUTOFMEMORY;
 450         goto fail;
 451     }
 452
 453     /* read palette */
 454     offbits.QuadPart = This->palette_offset;
 455     hr = IStream_Seek(This->stream, offbits, STREAM_SEEK_SET, NULL);
 456     if (FAILED(hr)) goto fail;
 457
 458     hr = IStream_Read(This->stream, palette, palettesize, &bytesread);
 459     if (FAILED(hr) || bytesread != palettesize) goto fail;
 460
 461     /* read RLE data */
 462     offbits.QuadPart = This->image_offset;
 463     hr = IStream_Seek(This->stream, offbits, STREAM_SEEK_SET, NULL);
 464     if (FAILED(hr)) goto fail;
 465
 466     /* decode RLE */
 467     bgrdata = (DWORD*)This->imagedata;
 468     x = 0;
 469     y = 0;
 470     cursor = 0;
 471     bytesread = 0;
 472     while (y < height)
 473     {
 474         BYTE length;
 475         hr = ReadByte(This->stream, rledata, 4096, &cursor, &bytesread, &length);
 476
 477         if (FAILED(hr))
 478             goto fail;
 479         else if (length == 0)
 480         {
 481             /* escape code */
 482             BYTE escape;
 483             hr = ReadByte(This->stream, rledata, 4096, &cursor, &bytesread, &escape);
 484             if (FAILED(hr))
 485                 goto fail;
 486             switch(escape)
 487             {
 488             case 0: /* end of line */
 489                 x = 0;
 490                 y++;
 491                 break;
 492             case 1: /* end of bitmap */
 493                 goto end;
 494             case 2: /* delta */
 495             {
 496                 BYTE dx, dy;
 497                 hr = ReadByte(This->stream, rledata, 4096, &cursor, &bytesread, &dx);
 498                 if (SUCCEEDED(hr))
 499                     hr = ReadByte(This->stream, rledata, 4096, &cursor, &bytesread, &dy);
 500                 if (FAILED(hr))
 501                     goto fail;
 502                 x += dx;
 503                 y += dy;
 504                 break;
 505             }
 506             default: /* absolute mode */
 507                 length = escape;
 508                 while (length-- && x < width)
 509                 {
 510                     BYTE index;
 511                     hr = ReadByte(This->stream, rledata, 4096, &cursor, &bytesread, &index);
 512                     if (FAILED(hr))
 513                         goto fail;
 514                     bgrdata[y*width + x++] = palette[index];
 515                 }
 516                 if (escape & 1)
 517                     hr = ReadByte(This->stream, rledata, 4096, &cursor, &bytesread, &length); /* skip pad byte */
 518                 if (FAILED(hr))
 519                     goto fail;
 520             }
 521         }
 522         else
 523         {
 524             BYTE index;
 525             DWORD color;
 526             hr = ReadByte(This->stream, rledata, 4096, &cursor, &bytesread, &index);
 527             if (FAILED(hr))
 528                 goto fail;
 529             color = palette[index];
 530             while (length-- && x < width)
 531                 bgrdata[y*width + x++] = color;
 532         }
 533     }
 534
 535 end:
 536     This->imagedatastart = This->imagedata + (height-1) * bytesperrow;
 537     This->stride = -bytesperrow;
 538
 539     return S_OK;
 540
 541 fail:
 542     HeapFree(GetProcessHeap(), 0, This->imagedata);
 543     This->imagedata = NULL;
 544     if (SUCCEEDED(hr)) hr = E_FAIL;
 545     return hr;
 546 }
 547
 548 static HRESULT BmpFrameDecode_ReadRLE4(BmpDecoder* This)
 549 {
 550     UINT bytesperrow;
 551     UINT width, height;
 552     BYTE rledata[4096];
 553     UINT datasize, palettesize;
 554     DWORD palette[16];
 555     UINT x, y;
 556     DWORD *bgrdata;
 557     HRESULT hr;
 558     LARGE_INTEGER offbits;
 559     ULONG cursor=0, bytesread=0;
 560
 561     width = This->bih.bV5Width;
 562     height = abs(This->bih.bV5Height);
 563     bytesperrow = width * 4;
 564     datasize = bytesperrow * height;
 565     if (This->bih.bV5ClrUsed && This->bih.bV5ClrUsed < 16)
 566         palettesize = 4 * This->bih.bV5ClrUsed;
 567     else
 568         palettesize = 4 * 16;
 569
 570     This->imagedata = HeapAlloc(GetProcessHeap(), 0, datasize);
 571     if (!This->imagedata)
 572     {
 573         hr = E_OUTOFMEMORY;
 574         goto fail;
 575     }
 576
 577     /* read palette */
 578     offbits.QuadPart = This->palette_offset;
 579     hr = IStream_Seek(This->stream, offbits, STREAM_SEEK_SET, NULL);
 580     if (FAILED(hr)) goto fail;
 581
 582     hr = IStream_Read(This->stream, palette, palettesize, &bytesread);
 583     if (FAILED(hr) || bytesread != palettesize) goto fail;
 584
 585     /* read RLE data */
 586     offbits.QuadPart = This->image_offset;
 587     hr = IStream_Seek(This->stream, offbits, STREAM_SEEK_SET, NULL);
 588     if (FAILED(hr)) goto fail;
 589
 590     /* decode RLE */
 591     bgrdata = (DWORD*)This->imagedata;
 592     x = 0;
 593     y = 0;
 594     cursor = 0;
 595     bytesread = 0;
 596     while (y < height)
 597     {
 598         BYTE length;
 599         hr = ReadByte(This->stream, rledata, 4096, &cursor, &bytesread, &length);
 600
 601         if (FAILED(hr))
 602             goto fail;
 603         else if (length == 0)
 604         {
 605             /* escape code */
 606             BYTE escape;
 607             hr = ReadByte(This->stream, rledata, 4096, &cursor, &bytesread, &escape);
 608             if (FAILED(hr))
 609                 goto fail;
 610             switch(escape)
 611             {
 612             case 0: /* end of line */
 613                 x = 0;
 614                 y++;
 615                 break;
 616             case 1: /* end of bitmap */
 617                 goto end;
 618             case 2: /* delta */
 619             {
 620                 BYTE dx, dy;
 621                 hr = ReadByte(This->stream, rledata, 4096, &cursor, &bytesread, &dx);
 622                 if (SUCCEEDED(hr))
 623                     hr = ReadByte(This->stream, rledata, 4096, &cursor, &bytesread, &dy);
 624                 if (FAILED(hr))
 625                     goto fail;
 626                 x += dx;
 627                 y += dy;
 628                 break;
 629             }
 630             default: /* absolute mode */
 631             {
 632                 BYTE realsize=0;
 633                 length = escape;
 634                 while (length-- && x < width)
 635                 {
 636                     BYTE colors;
 637                     hr = ReadByte(This->stream, rledata, 4096, &cursor, &bytesread, &colors);
 638                     realsize++;
 639                     if (FAILED(hr))
 640                         goto fail;
 641                     bgrdata[y*width + x++] = palette[colors>>4];
 642                     if (length-- && x < width)
 643                         bgrdata[y*width + x++] = palette[colors&0xf];
 644                     else
 645                         break;
 646                 }
 647                 if (realsize & 1)
 648                     hr = ReadByte(This->stream, rledata, 4096, &cursor, &bytesread, &length); /* skip pad byte */
 649                 if (FAILED(hr))
 650                     goto fail;
 651             }
 652             }
 653         }
 654         else
 655         {
 656             BYTE colors;
 657             DWORD color1;
 658             DWORD color2;
 659             hr = ReadByte(This->stream, rledata, 4096, &cursor, &bytesread, &colors);
 660             if (FAILED(hr))
 661                 goto fail;
 662             color1 = palette[colors>>4];
 663             color2 = palette[colors&0xf];
 664             while (length-- && x < width)
 665             {
 666                 bgrdata[y*width + x++] = color1;
 667                 if (length-- && x < width)
 668                     bgrdata[y*width + x++] = color2;
 669                 else
 670                     break;
 671             }
 672         }
 673     }
 674
 675 end:
 676     This->imagedatastart = This->imagedata + (height-1) * bytesperrow;
 677     This->stride = -bytesperrow;
 678
 679     return S_OK;
 680
 681 fail:
 682     HeapFree(GetProcessHeap(), 0, This->imagedata);
 683     This->imagedata = NULL;
 684     if (SUCCEEDED(hr)) hr = E_FAIL;
 685     return hr;
 686 }
 687
 688 static HRESULT BmpFrameDecode_ReadUnsupported(BmpDecoder* This)
 689 {
 690     return E_FAIL;
 691 }
 692
 693 struct bitfields_format {
 694     WORD bitcount; /* 0 for end of list */
 695     DWORD redmask;
 696     DWORD greenmask;
 697     DWORD bluemask;
 698     DWORD alphamask;
 699     const WICPixelFormatGUID *pixelformat;
 700     ReadDataFunc read_data_func;
 701 };
 702
 703 static const struct bitfields_format bitfields_formats[] = {
 704     {16,0x7c00,0x3e0,0x1f,0,&GUID_WICPixelFormat16bppBGR555,BmpFrameDecode_ReadUncompressed},
 705     {16,0xf800,0x7e0,0x1f,0,&GUID_WICPixelFormat16bppBGR565,BmpFrameDecode_ReadUncompressed},
 706     {32,0xff0000,0xff00,0xff,0,&GUID_WICPixelFormat32bppBGR,BmpFrameDecode_ReadUncompressed},
 707     {32,0xff0000,0xff00,0xff,0xff000000,&GUID_WICPixelFormat32bppBGRA,BmpFrameDecode_ReadUncompressed},
 708     {0}
 709 };
 710
 711 static const IWICBitmapFrameDecodeVtbl BmpDecoder_FrameVtbl = {
 712     BmpFrameDecode_QueryInterface,
 713     BmpFrameDecode_AddRef,
 714     BmpFrameDecode_Release,
 715     BmpFrameDecode_GetSize,
 716     BmpFrameDecode_GetPixelFormat,
 717     BmpFrameDecode_GetResolution,
 718     BmpFrameDecode_CopyPalette,
 719     BmpFrameDecode_CopyPixels,
 720     BmpFrameDecode_GetMetadataQueryReader,
 721     BmpFrameDecode_GetColorContexts,
 722     BmpFrameDecode_GetThumbnail
 723 };
 724
 725 static HRESULT BmpDecoder_ReadHeaders(BmpDecoder* This, IStream *stream)
 726 {
 727     HRESULT hr;
 728     ULONG bytestoread, bytesread;
 729     LARGE_INTEGER seek;
 730
 731     if (This->initialized) return WINCODEC_ERR_WRONGSTATE;
 732
 733     seek.QuadPart = 0;
 734     hr = IStream_Seek(stream, seek, STREAM_SEEK_SET, NULL);
 735     if (FAILED(hr)) return hr;
 736
 737     if (!This->packed)
 738     {
 739         BITMAPFILEHEADER bfh;
 740         hr = IStream_Read(stream, &bfh, sizeof(BITMAPFILEHEADER), &bytesread);
 741         if (FAILED(hr)) return hr;
 742         if (bytesread != sizeof(BITMAPFILEHEADER) ||
 743             bfh.bfType != 0x4d42 /* "BM" */) return E_FAIL;
 744         This->image_offset = bfh.bfOffBits;
 745     }
 746
 747     hr = IStream_Read(stream, &This->bih.bV5Size, sizeof(DWORD), &bytesread);
 748     if (FAILED(hr)) return hr;
 749     if (bytesread != sizeof(DWORD) ||
 750         (This->bih.bV5Size != sizeof(BITMAPCOREHEADER) &&
 751          This->bih.bV5Size != sizeof(BITMAPCOREHEADER2) &&
 752          This->bih.bV5Size != sizeof(BITMAPINFOHEADER) &&
 753          This->bih.bV5Size != sizeof(BITMAPV4HEADER) &&
 754          This->bih.bV5Size != sizeof(BITMAPV5HEADER))) return E_FAIL;
 755
 756     bytestoread = This->bih.bV5Size-sizeof(DWORD);
 757     hr = IStream_Read(stream, &This->bih.bV5Width, bytestoread, &bytesread);
 758     if (FAILED(hr)) return hr;
 759     if (bytestoread != bytesread) return E_FAIL;
 760
 761     if (This->packed)
 762         This->palette_offset = This->bih.bV5Size;
 763     else
 764         This->palette_offset = sizeof(BITMAPFILEHEADER) + This->bih.bV5Size;
 765
 766     if (This->icoframe)
 767     {
 768         if (This->bih.bV5Size == sizeof(BITMAPCOREHEADER))
 769         {
 770             BITMAPCOREHEADER *bch = (BITMAPCOREHEADER*)&This->bih;
 771             bch->bcHeight /= 2;
 772         }
 773         else
 774         {
 775             This->bih.bV5Height /= 2;
 776         }
 777     }
 778
 779     /* if this is a BITMAPINFOHEADER with BI_BITFIELDS compression, we need to
 780         read the extra fields */
 781     if (This->bih.bV5Size == sizeof(BITMAPINFOHEADER) &&
 782         This->bih.bV5Compression == BI_BITFIELDS)
 783     {
 784         hr = IStream_Read(stream, &This->bih.bV5RedMask, 12, &bytesread);
 785         if (FAILED(hr)) return hr;
 786         if (bytesread != 12) return E_FAIL;
 787         This->bih.bV5AlphaMask = 0;
 788         This->palette_offset += 12;
 789     }
 790
 791     /* decide what kind of bitmap this is and how/if we can read it */
 792     if (This->bih.bV5Size == sizeof(BITMAPCOREHEADER))
 793     {
 794         BITMAPCOREHEADER *bch = (BITMAPCOREHEADER*)&This->bih;
 795         TRACE("BITMAPCOREHEADER with depth=%i\n", bch->bcBitCount);
 796         This->bitsperpixel = bch->bcBitCount;
 797         This->read_data_func = BmpFrameDecode_ReadUncompressed;
 798         switch(bch->bcBitCount)
 799         {
 800         case 1:
 801             This->pixelformat = &GUID_WICPixelFormat1bppIndexed;
 802             break;
 803         case 2:
 804             This->pixelformat = &GUID_WICPixelFormat2bppIndexed;
 805             break;
 806         case 4:
 807             This->pixelformat = &GUID_WICPixelFormat4bppIndexed;
 808             break;
 809         case 8:
 810             This->pixelformat = &GUID_WICPixelFormat8bppIndexed;
 811             break;
 812         case 24:
 813             This->pixelformat = &GUID_WICPixelFormat24bppBGR;
 814             break;
 815         default:
 816             This->pixelformat = &GUID_WICPixelFormatUndefined;
 817             WARN("unsupported bit depth %i for BITMAPCOREHEADER\n", bch->bcBitCount);
 818             break;
 819         }
 820     }
 821     else /* struct is compatible with BITMAPINFOHEADER */
 822     {
 823         TRACE("bitmap header=%i compression=%i depth=%i\n", This->bih.bV5Size, This->bih.bV5Compression, This->bih.bV5BitCount);
 824         switch(This->bih.bV5Compression)
 825         {
 826         case BI_RGB:
 827             This->bitsperpixel = This->bih.bV5BitCount;
 828             This->read_data_func = BmpFrameDecode_ReadUncompressed;
 829             switch(This->bih.bV5BitCount)
 830             {
 831             case 1:
 832                 This->pixelformat = &GUID_WICPixelFormat1bppIndexed;
 833                 break;
 834             case 2:
 835                 This->pixelformat = &GUID_WICPixelFormat2bppIndexed;
 836                 break;
 837             case 4:
 838                 This->pixelformat = &GUID_WICPixelFormat4bppIndexed;
 839                 break;
 840             case 8:
 841                 This->pixelformat = &GUID_WICPixelFormat8bppIndexed;
 842                 break;
 843             case 16:
 844                 This->pixelformat = &GUID_WICPixelFormat16bppBGR555;
 845                 break;
 846             case 24:
 847                 This->pixelformat = &GUID_WICPixelFormat24bppBGR;
 848                 break;
 849             case 32:
 850                 This->pixelformat = &GUID_WICPixelFormat32bppBGR;
 851                 break;
 852             default:
 853                 This->pixelformat = &GUID_WICPixelFormatUndefined;
 854                 FIXME("unsupported bit depth %i for uncompressed RGB\n", This->bih.bV5BitCount);
 855             }
 856             break;
 857         case BI_RLE8:
 858             This->bitsperpixel = 32;
 859             This->read_data_func = BmpFrameDecode_ReadRLE8;
 860             This->pixelformat = &GUID_WICPixelFormat32bppBGR;
 861             break;
 862         case BI_RLE4:
 863             This->bitsperpixel = 32;
 864             This->read_data_func = BmpFrameDecode_ReadRLE4;
 865             This->pixelformat = &GUID_WICPixelFormat32bppBGR;
 866             break;
 867         case BI_BITFIELDS:
 868         {
 869             const struct bitfields_format *format;
 870             if (This->bih.bV5Size == sizeof(BITMAPCOREHEADER2))
 871             {
 872                 /* BCH2 doesn't support bitfields; this is Huffman 1D compression */
 873                 This->bitsperpixel = 0;
 874                 This->read_data_func = BmpFrameDecode_ReadUnsupported;
 875                 This->pixelformat = &GUID_WICPixelFormatUndefined;
 876                 FIXME("Huffman 1D compression is unsupported\n");
 877                 break;
 878             }
 879             This->bitsperpixel = This->bih.bV5BitCount;
 880             for (format = bitfields_formats; format->bitcount; format++)
 881             {
 882                 if ((format->bitcount == This->bih.bV5BitCount) &&
 883                     (format->redmask == This->bih.bV5RedMask) &&
 884                     (format->greenmask == This->bih.bV5GreenMask) &&
 885                     (format->bluemask == This->bih.bV5BlueMask) &&
 886                     (format->alphamask == This->bih.bV5AlphaMask))
 887                 {
 888                     This->read_data_func = format->read_data_func;
 889                     This->pixelformat = format->pixelformat;
 890                     break;
 891                 }
 892             }
 893             if (!format->bitcount)
 894             {
 895                 This->read_data_func = BmpFrameDecode_ReadUncompressed;
 896                 This->pixelformat = &GUID_WICPixelFormatUndefined;
 897                 FIXME("unsupported bitfields type depth=%i red=%x green=%x blue=%x alpha=%x\n",
 898                     This->bih.bV5BitCount, This->bih.bV5RedMask, This->bih.bV5GreenMask, This->bih.bV5BlueMask, This->bih.bV5AlphaMask);
 899             }
 900             break;
 901         }
 902         default:
 903             This->bitsperpixel = 0;
 904             This->read_data_func = BmpFrameDecode_ReadUnsupported;
 905             This->pixelformat = &GUID_WICPixelFormatUndefined;
 906             FIXME("unsupported bitmap type header=%i compression=%i depth=%i\n", This->bih.bV5Size, This->bih.bV5Compression, This->bih.bV5BitCount);
 907             break;
 908         }
 909     }
 910
 911     if (This->packed)
 912     {
 913         /* In a packed DIB, the image follows the palette. */
 914         ULONG palette_count, palette_size;
 915         if (This->bih.bV5ClrUsed)
 916             palette_count = This->bih.bV5ClrUsed;
 917         else if (This->bih.bV5BitCount <= 8)
 918             palette_count = 1 << This->bih.bV5BitCount;
 919         else
 920             palette_count = 0;
 921         if (This->bih.bV5Size == sizeof(BITMAPCOREHEADER))
 922             palette_size = sizeof(RGBTRIPLE) * palette_count;
 923         else
 924             palette_size = sizeof(RGBQUAD) * palette_count;
 925         This->image_offset = This->palette_offset + palette_size;
 926     }
 927
 928     This->initialized = TRUE;
 929
 930     return S_OK;
 931 }
 932
 933 static HRESULT WINAPI BmpDecoder_QueryInterface(IWICBitmapDecoder *iface, REFIID iid,
 934     void **ppv)
 935 {
 936     BmpDecoder *This = (BmpDecoder*)iface;
 937     TRACE("(%p,%s,%p)\n", iface, debugstr_guid(iid), ppv);
 938
 939     if (!ppv) return E_INVALIDARG;
 940
 941     if (IsEqualIID(&IID_IUnknown, iid) || IsEqualIID(&IID_IWICBitmapDecoder, iid))
 942     {
 943         *ppv = This;
 944     }
 945     else
 946     {
 947         *ppv = NULL;
 948         return E_NOINTERFACE;
 949     }
 950
 951     IUnknown_AddRef((IUnknown*)*ppv);
 952     return S_OK;
 953 }
 954
 955 static ULONG WINAPI BmpDecoder_AddRef(IWICBitmapDecoder *iface)
 956 {
 957     BmpDecoder *This = (BmpDecoder*)iface;
 958     ULONG ref = InterlockedIncrement(&This->ref);
 959
 960     TRACE("(%p) refcount=%u\n", iface, ref);
 961
 962     return ref;
 963 }
 964
 965 static ULONG WINAPI BmpDecoder_Release(IWICBitmapDecoder *iface)
 966 {
 967     BmpDecoder *This = (BmpDecoder*)iface;
 968     ULONG ref = InterlockedDecrement(&This->ref);
 969
 970     TRACE("(%p) refcount=%u\n", iface, ref);
 971
 972     if (ref == 0)
 973     {
 974         if (This->stream) IStream_Release(This->stream);
 975         HeapFree(GetProcessHeap(), 0, This->imagedata);
 976         This->lock.DebugInfo->Spare[0] = 0;
 977         DeleteCriticalSection(&This->lock);
 978         HeapFree(GetProcessHeap(), 0, This);
 979     }
 980
 981     return ref;
 982 }
 983
 984 static HRESULT WINAPI BmpDecoder_QueryCapability(IWICBitmapDecoder *iface, IStream *pIStream,
 985     DWORD *pdwCapability)
 986 {
 987     HRESULT hr;
 988     BmpDecoder *This = (BmpDecoder*)iface;
 989
 990     EnterCriticalSection(&This->lock);
 991     hr = BmpDecoder_ReadHeaders(This, pIStream);
 992     LeaveCriticalSection(&This->lock);
 993     if (FAILED(hr)) return hr;
 994
 995     if (This->read_data_func == BmpFrameDecode_ReadUnsupported)
 996         *pdwCapability = 0;
 997     else
 998         *pdwCapability = WICBitmapDecoderCapabilityCanDecodeAllImages;
 999
1000     return S_OK;
1001 }
1002
1003 static HRESULT WINAPI BmpDecoder_Initialize(IWICBitmapDecoder *iface, IStream *pIStream,
1004     WICDecodeOptions cacheOptions)
1005 {
1006     HRESULT hr;
1007     BmpDecoder *This = (BmpDecoder*)iface;
1008
1009     EnterCriticalSection(&This->lock);
1010     hr = BmpDecoder_ReadHeaders(This, pIStream);
1011
1012     if (SUCCEEDED(hr))
1013     {
1014         This->stream = pIStream;
1015         IStream_AddRef(pIStream);
1016     }
1017     LeaveCriticalSection(&This->lock);
1018
1019     return hr;
1020 }
1021
1022 static HRESULT WINAPI BmpDecoder_GetContainerFormat(IWICBitmapDecoder *iface,
1023     GUID *pguidContainerFormat)
1024 {
1025     memcpy(pguidContainerFormat, &GUID_ContainerFormatBmp, sizeof(GUID));
1026     return S_OK;
1027 }
1028
1029 static HRESULT WINAPI BmpDecoder_GetDecoderInfo(IWICBitmapDecoder *iface,
1030     IWICBitmapDecoderInfo **ppIDecoderInfo)
1031 {
1032     HRESULT hr;
1033     IWICComponentInfo *compinfo;
1034
1035     TRACE("(%p,%p)\n", iface, ppIDecoderInfo);
1036
1037     hr = CreateComponentInfo(&CLSID_WICBmpDecoder, &compinfo);
1038     if (FAILED(hr)) return hr;
1039
1040     hr = IWICComponentInfo_QueryInterface(compinfo, &IID_IWICBitmapDecoderInfo,
1041         (void**)ppIDecoderInfo);
1042
1043     IWICComponentInfo_Release(compinfo);
1044
1045     return hr;
1046 }
1047
1048 static HRESULT WINAPI BmpDecoder_CopyPalette(IWICBitmapDecoder *iface,
1049     IWICPalette *pIPalette)
1050 {
1051     TRACE("(%p,%p)\n", iface, pIPalette);
1052
1053     return WINCODEC_ERR_PALETTEUNAVAILABLE;
1054 }
1055
1056 static HRESULT WINAPI BmpDecoder_GetMetadataQueryReader(IWICBitmapDecoder *iface,
1057     IWICMetadataQueryReader **ppIMetadataQueryReader)
1058 {
1059     TRACE("(%p,%p)\n", iface, ppIMetadataQueryReader);
1060     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
1061 }
1062
1063 static HRESULT WINAPI BmpDecoder_GetPreview(IWICBitmapDecoder *iface,
1064     IWICBitmapSource **ppIBitmapSource)
1065 {
1066     TRACE("(%p,%p)\n", iface, ppIBitmapSource);
1067     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
1068 }
1069
1070 static HRESULT WINAPI BmpDecoder_GetColorContexts(IWICBitmapDecoder *iface,
1071     UINT cCount, IWICColorContext **ppIColorContexts, UINT *pcActualCount)
1072 {
1073     TRACE("(%p,%u,%p,%p)\n", iface, cCount, ppIColorContexts, pcActualCount);
1074     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
1075 }
1076
1077 static HRESULT WINAPI BmpDecoder_GetThumbnail(IWICBitmapDecoder *iface,
1078     IWICBitmapSource **ppIThumbnail)
1079 {
1080     TRACE("(%p,%p)\n", iface, ppIThumbnail);
1081     return WINCODEC_ERR_CODECNOTHUMBNAIL;
1082 }
1083
1084 static HRESULT WINAPI BmpDecoder_GetFrameCount(IWICBitmapDecoder *iface,
1085     UINT *pCount)
1086 {
1087     *pCount = 1;
1088     return S_OK;
1089 }
1090
1091 static HRESULT WINAPI BmpDecoder_GetFrame(IWICBitmapDecoder *iface,
1092     UINT index, IWICBitmapFrameDecode **ppIBitmapFrame)
1093 {
1094     BmpDecoder *This = (BmpDecoder*)iface;
1095
1096     if (index != 0) return E_INVALIDARG;
1097
1098     if (!This->stream) return WINCODEC_ERR_WRONGSTATE;
1099
1100     *ppIBitmapFrame = (IWICBitmapFrameDecode*)&This->lpFrameVtbl;
1101     IWICBitmapDecoder_AddRef(iface);
1102
1103     return S_OK;
1104 }
1105
1106 static const IWICBitmapDecoderVtbl BmpDecoder_Vtbl = {
1107     BmpDecoder_QueryInterface,
1108     BmpDecoder_AddRef,
1109     BmpDecoder_Release,
1110     BmpDecoder_QueryCapability,
1111     BmpDecoder_Initialize,
1112     BmpDecoder_GetContainerFormat,
1113     BmpDecoder_GetDecoderInfo,
1114     BmpDecoder_CopyPalette,
1115     BmpDecoder_GetMetadataQueryReader,
1116     BmpDecoder_GetPreview,
1117     BmpDecoder_GetColorContexts,
1118     BmpDecoder_GetThumbnail,
1119     BmpDecoder_GetFrameCount,
1120     BmpDecoder_GetFrame
1121 };
1122
1123 static HRESULT BmpDecoder_Construct(int packed, int icoframe, IUnknown *pUnkOuter, REFIID iid, void** ppv)
1124 {
1125     BmpDecoder *This;
1126     HRESULT ret;
1127
1128     TRACE("(%p,%s,%p)\n", pUnkOuter, debugstr_guid(iid), ppv);
1129
1130     *ppv = NULL;
1131
1132     if (pUnkOuter) return CLASS_E_NOAGGREGATION;
1133
1134     This = HeapAlloc(GetProcessHeap(), 0, sizeof(BmpDecoder));
1135     if (!This) return E_OUTOFMEMORY;
1136
1137     This->lpVtbl = &BmpDecoder_Vtbl;
1138     This->lpFrameVtbl = &BmpDecoder_FrameVtbl;
1139     This->ref = 1;
1140     This->initialized = FALSE;
1141     This->stream = NULL;
1142     This->imagedata = NULL;
1143     InitializeCriticalSection(&This->lock);
1144     This->lock.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": BmpDecoder.lock");
1145     This->packed = packed;
1146     This->icoframe = icoframe;
1147
1148     ret = IUnknown_QueryInterface((IUnknown*)This, iid, ppv);
1149     IUnknown_Release((IUnknown*)This);
1150
1151     return ret;
1152 }
1153
1154 HRESULT BmpDecoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv)
1155 {
1156     return BmpDecoder_Construct(FALSE, FALSE, pUnkOuter, iid, ppv);
1157 }
1158
1159 HRESULT DibDecoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv)
1160 {
1161     return BmpDecoder_Construct(TRUE, FALSE, pUnkOuter, iid, ppv);
1162 }
1163
1164 HRESULT IcoDibDecoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv)
1165 {
1166     return BmpDecoder_Construct(TRUE, TRUE, pUnkOuter, iid, ppv);
1167 }
1168
1169 /* Return the offset where the mask of an icon might be, or 0 for failure. */
1170 void BmpDecoder_FindIconMask(IWICBitmapDecoder *decoder, ULONG *mask_offset, int *topdown)
1171 {
1172     BmpDecoder *This = (BmpDecoder*)decoder;
1173
1174     assert(This->lpVtbl == &BmpDecoder_Vtbl);
1175     assert(This->stream != NULL);
1176
1177     if (This->read_data_func == BmpFrameDecode_ReadUncompressed)
1178     {
1179         /* RGB or BITFIELDS data */
1180         ULONG width, height, bytesperrow, datasize;
1181         IWICBitmapFrameDecode_GetSize((IWICBitmapFrameDecode*)&This->lpFrameVtbl, &width, &height);
1182         bytesperrow = (((width * This->bitsperpixel)+31)/32)*4;
1183         datasize = bytesperrow * height;
1184         *mask_offset = This->image_offset + datasize;
1185     }
1186     else
1187         *mask_offset = 0;
1188
1189     *topdown = This->stride > 0;
1190 }