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 ReadByte(IStream *stream, BYTE *buffer, ULONG buffer_size,
 399     ULONG *cursor, ULONG *bytesread, BYTE *result)
 400 {
 401     HRESULT hr=S_OK;
 402
 403     if (*bytesread == 0 || *cursor == *bytesread)
 404     {
 405         hr = IStream_Read(stream, buffer, buffer_size, bytesread);
 406         *cursor = 0;
 407     }
 408
 409     if (SUCCEEDED(hr))
 410     {
 411         if (*cursor < *bytesread)
 412             *result = buffer[(*cursor)++];
 413         else
 414             hr = E_FAIL;
 415     }
 416
 417     return hr;
 418 }
 419
 420 static HRESULT BmpFrameDecode_ReadRLE8(BmpDecoder* This)
 421 {
 422     UINT bytesperrow;
 423     UINT width, height;
 424     BYTE rledata[4096];
 425     UINT datasize, palettesize;
 426     DWORD palette[256];
 427     UINT x, y;
 428     DWORD *bgrdata;
 429     HRESULT hr;
 430     LARGE_INTEGER offbits;
 431     ULONG cursor=0, bytesread=0;
 432
 433     width = This->bih.bV5Width;
 434     height = abs(This->bih.bV5Height);
 435     bytesperrow = width * 4;
 436     datasize = bytesperrow * height;
 437     if (This->bih.bV5ClrUsed && This->bih.bV5ClrUsed < 256)
 438         palettesize = 4 * This->bih.bV5ClrUsed;
 439     else
 440         palettesize = 4 * 256;
 441
 442     This->imagedata = HeapAlloc(GetProcessHeap(), 0, datasize);
 443     if (!This->imagedata)
 444     {
 445         hr = E_OUTOFMEMORY;
 446         goto fail;
 447     }
 448
 449     /* read palette */
 450     offbits.QuadPart = sizeof(BITMAPFILEHEADER) + This->bih.bV5Size;
 451     hr = IStream_Seek(This->stream, offbits, STREAM_SEEK_SET, NULL);
 452     if (FAILED(hr)) goto fail;
 453
 454     hr = IStream_Read(This->stream, palette, palettesize, &bytesread);
 455     if (FAILED(hr) || bytesread != palettesize) goto fail;
 456
 457     /* read RLE data */
 458     offbits.QuadPart = This->bfh.bfOffBits;
 459     hr = IStream_Seek(This->stream, offbits, STREAM_SEEK_SET, NULL);
 460     if (FAILED(hr)) goto fail;
 461
 462     /* decode RLE */
 463     bgrdata = (DWORD*)This->imagedata;
 464     x = 0;
 465     y = 0;
 466     cursor = 0;
 467     bytesread = 0;
 468     while (y < height)
 469     {
 470         BYTE length;
 471         hr = ReadByte(This->stream, rledata, 4096, &cursor, &bytesread, &length);
 472
 473         if (FAILED(hr))
 474             goto fail;
 475         else if (length == 0)
 476         {
 477             /* escape code */
 478             BYTE escape;
 479             hr = ReadByte(This->stream, rledata, 4096, &cursor, &bytesread, &escape);
 480             if (FAILED(hr))
 481                 goto fail;
 482             switch(escape)
 483             {
 484             case 0: /* end of line */
 485                 x = 0;
 486                 y++;
 487                 break;
 488             case 1: /* end of bitmap */
 489                 goto end;
 490             case 2: /* delta */
 491             {
 492                 BYTE dx, dy;
 493                 hr = ReadByte(This->stream, rledata, 4096, &cursor, &bytesread, &dx);
 494                 if (SUCCEEDED(hr))
 495                     hr = ReadByte(This->stream, rledata, 4096, &cursor, &bytesread, &dy);
 496                 if (FAILED(hr))
 497                     goto fail;
 498                 x += dx;
 499                 y += dy;
 500                 break;
 501             }
 502             default: /* absolute mode */
 503                 length = escape;
 504                 while (length-- && x < width)
 505                 {
 506                     BYTE index;
 507                     hr = ReadByte(This->stream, rledata, 4096, &cursor, &bytesread, &index);
 508                     if (FAILED(hr))
 509                         goto fail;
 510                     bgrdata[y*width + x++] = palette[index];
 511                 }
 512                 if (escape & 1)
 513                     hr = ReadByte(This->stream, rledata, 4096, &cursor, &bytesread, &length); /* skip pad byte */
 514                 if (FAILED(hr))
 515                     goto fail;
 516             }
 517         }
 518         else
 519         {
 520             BYTE index;
 521             DWORD color;
 522             hr = ReadByte(This->stream, rledata, 4096, &cursor, &bytesread, &index);
 523             if (FAILED(hr))
 524                 goto fail;
 525             color = palette[index];
 526             while (length-- && x < width)
 527                 bgrdata[y*width + x++] = color;
 528         }
 529     }
 530
 531 end:
 532     This->imagedatastart = This->imagedata + (height-1) * bytesperrow;
 533     This->stride = -bytesperrow;
 534
 535     return S_OK;
 536
 537 fail:
 538     HeapFree(GetProcessHeap(), 0, This->imagedata);
 539     This->imagedata = NULL;
 540     if (SUCCEEDED(hr)) hr = E_FAIL;
 541     return hr;
 542 }
 543
 544 static HRESULT BmpFrameDecode_ReadRLE4(BmpDecoder* This)
 545 {
 546     UINT bytesperrow;
 547     UINT width, height;
 548     BYTE rledata[4096];
 549     UINT datasize, palettesize;
 550     DWORD palette[16];
 551     UINT x, y;
 552     DWORD *bgrdata;
 553     HRESULT hr;
 554     LARGE_INTEGER offbits;
 555     ULONG cursor=0, bytesread=0;
 556
 557     width = This->bih.bV5Width;
 558     height = abs(This->bih.bV5Height);
 559     bytesperrow = width * 4;
 560     datasize = bytesperrow * height;
 561     if (This->bih.bV5ClrUsed && This->bih.bV5ClrUsed < 16)
 562         palettesize = 4 * This->bih.bV5ClrUsed;
 563     else
 564         palettesize = 4 * 16;
 565
 566     This->imagedata = HeapAlloc(GetProcessHeap(), 0, datasize);
 567     if (!This->imagedata)
 568     {
 569         hr = E_OUTOFMEMORY;
 570         goto fail;
 571     }
 572
 573     /* read palette */
 574     offbits.QuadPart = sizeof(BITMAPFILEHEADER) + This->bih.bV5Size;
 575     hr = IStream_Seek(This->stream, offbits, STREAM_SEEK_SET, NULL);
 576     if (FAILED(hr)) goto fail;
 577
 578     hr = IStream_Read(This->stream, palette, palettesize, &bytesread);
 579     if (FAILED(hr) || bytesread != palettesize) goto fail;
 580
 581     /* read RLE data */
 582     offbits.QuadPart = This->bfh.bfOffBits;
 583     hr = IStream_Seek(This->stream, offbits, STREAM_SEEK_SET, NULL);
 584     if (FAILED(hr)) goto fail;
 585
 586     /* decode RLE */
 587     bgrdata = (DWORD*)This->imagedata;
 588     x = 0;
 589     y = 0;
 590     cursor = 0;
 591     bytesread = 0;
 592     while (y < height)
 593     {
 594         BYTE length;
 595         hr = ReadByte(This->stream, rledata, 4096, &cursor, &bytesread, &length);
 596
 597         if (FAILED(hr))
 598             goto fail;
 599         else if (length == 0)
 600         {
 601             /* escape code */
 602             BYTE escape;
 603             hr = ReadByte(This->stream, rledata, 4096, &cursor, &bytesread, &escape);
 604             if (FAILED(hr))
 605                 goto fail;
 606             switch(escape)
 607             {
 608             case 0: /* end of line */
 609                 x = 0;
 610                 y++;
 611                 break;
 612             case 1: /* end of bitmap */
 613                 goto end;
 614             case 2: /* delta */
 615             {
 616                 BYTE dx, dy;
 617                 hr = ReadByte(This->stream, rledata, 4096, &cursor, &bytesread, &dx);
 618                 if (SUCCEEDED(hr))
 619                     hr = ReadByte(This->stream, rledata, 4096, &cursor, &bytesread, &dy);
 620                 if (FAILED(hr))
 621                     goto fail;
 622                 x += dx;
 623                 y += dy;
 624                 break;
 625             }
 626             default: /* absolute mode */
 627             {
 628                 BYTE realsize=0;
 629                 length = escape;
 630                 while (length-- && x < width)
 631                 {
 632                     BYTE colors;
 633                     hr = ReadByte(This->stream, rledata, 4096, &cursor, &bytesread, &colors);
 634                     realsize++;
 635                     if (FAILED(hr))
 636                         goto fail;
 637                     bgrdata[y*width + x++] = palette[colors>>4];
 638                     if (length-- && x < width)
 639                         bgrdata[y*width + x++] = palette[colors&0xf];
 640                     else
 641                         break;
 642                 }
 643                 if (realsize & 1)
 644                     hr = ReadByte(This->stream, rledata, 4096, &cursor, &bytesread, &length); /* skip pad byte */
 645                 if (FAILED(hr))
 646                     goto fail;
 647             }
 648             }
 649         }
 650         else
 651         {
 652             BYTE colors;
 653             DWORD color1;
 654             DWORD color2;
 655             hr = ReadByte(This->stream, rledata, 4096, &cursor, &bytesread, &colors);
 656             if (FAILED(hr))
 657                 goto fail;
 658             color1 = palette[colors>>4];
 659             color2 = palette[colors&0xf];
 660             while (length-- && x < width)
 661             {
 662                 bgrdata[y*width + x++] = color1;
 663                 if (length-- && x < width)
 664                     bgrdata[y*width + x++] = color2;
 665                 else
 666                     break;
 667             }
 668         }
 669     }
 670
 671 end:
 672     This->imagedatastart = This->imagedata + (height-1) * bytesperrow;
 673     This->stride = -bytesperrow;
 674
 675     return S_OK;
 676
 677 fail:
 678     HeapFree(GetProcessHeap(), 0, This->imagedata);
 679     This->imagedata = NULL;
 680     if (SUCCEEDED(hr)) hr = E_FAIL;
 681     return hr;
 682 }
 683
 684 static HRESULT BmpFrameDecode_ReadUnsupported(BmpDecoder* This)
 685 {
 686     return E_FAIL;
 687 }
 688
 689 struct bitfields_format {
 690     WORD bitcount; /* 0 for end of list */
 691     DWORD redmask;
 692     DWORD greenmask;
 693     DWORD bluemask;
 694     DWORD alphamask;
 695     const WICPixelFormatGUID *pixelformat;
 696     ReadDataFunc read_data_func;
 697 };
 698
 699 static const struct bitfields_format bitfields_formats[] = {
 700     {16,0x7c00,0x3e0,0x1f,0,&GUID_WICPixelFormat16bppBGR555,BmpFrameDecode_ReadUncompressed},
 701     {16,0xf800,0x7e0,0x1f,0,&GUID_WICPixelFormat16bppBGR565,BmpFrameDecode_ReadUncompressed},
 702     {32,0xff0000,0xff00,0xff,0,&GUID_WICPixelFormat32bppBGR,BmpFrameDecode_ReadUncompressed},
 703     {32,0xff0000,0xff00,0xff,0xff000000,&GUID_WICPixelFormat32bppBGRA,BmpFrameDecode_ReadUncompressed},
 704     {0}
 705 };
 706
 707 static const IWICBitmapFrameDecodeVtbl BmpDecoder_FrameVtbl = {
 708     BmpFrameDecode_QueryInterface,
 709     BmpFrameDecode_AddRef,
 710     BmpFrameDecode_Release,
 711     BmpFrameDecode_GetSize,
 712     BmpFrameDecode_GetPixelFormat,
 713     BmpFrameDecode_GetResolution,
 714     BmpFrameDecode_CopyPalette,
 715     BmpFrameDecode_CopyPixels,
 716     BmpFrameDecode_GetMetadataQueryReader,
 717     BmpFrameDecode_GetColorContexts,
 718     BmpFrameDecode_GetThumbnail
 719 };
 720
 721 static HRESULT BmpDecoder_ReadHeaders(BmpDecoder* This, IStream *stream)
 722 {
 723     HRESULT hr;
 724     ULONG bytestoread, bytesread;
 725     LARGE_INTEGER seek;
 726
 727     if (This->initialized) return WINCODEC_ERR_WRONGSTATE;
 728
 729     seek.QuadPart = 0;
 730     hr = IStream_Seek(stream, seek, STREAM_SEEK_SET, NULL);
 731     if (FAILED(hr)) return hr;
 732
 733     hr = IStream_Read(stream, &This->bfh, sizeof(BITMAPFILEHEADER), &bytesread);
 734     if (FAILED(hr)) return hr;
 735     if (bytesread != sizeof(BITMAPFILEHEADER) ||
 736         This->bfh.bfType != 0x4d42 /* "BM" */) return E_FAIL;
 737
 738     hr = IStream_Read(stream, &This->bih.bV5Size, sizeof(DWORD), &bytesread);
 739     if (FAILED(hr)) return hr;
 740     if (bytesread != sizeof(DWORD) ||
 741         (This->bih.bV5Size != sizeof(BITMAPCOREHEADER) &&
 742          This->bih.bV5Size != sizeof(BITMAPCOREHEADER2) &&
 743          This->bih.bV5Size != sizeof(BITMAPINFOHEADER) &&
 744          This->bih.bV5Size != sizeof(BITMAPV4HEADER) &&
 745          This->bih.bV5Size != sizeof(BITMAPV5HEADER))) return E_FAIL;
 746
 747     bytestoread = This->bih.bV5Size-sizeof(DWORD);
 748     hr = IStream_Read(stream, &This->bih.bV5Width, bytestoread, &bytesread);
 749     if (FAILED(hr)) return hr;
 750     if (bytestoread != bytesread) return E_FAIL;
 751
 752     /* if this is a BITMAPINFOHEADER with BI_BITFIELDS compression, we need to
 753         read the extra fields */
 754     if (This->bih.bV5Size == sizeof(BITMAPINFOHEADER) &&
 755         This->bih.bV5Compression == BI_BITFIELDS)
 756     {
 757         hr = IStream_Read(stream, &This->bih.bV5RedMask, 12, &bytesread);
 758         if (FAILED(hr)) return hr;
 759         if (bytesread != 12) return E_FAIL;
 760         This->bih.bV5AlphaMask = 0;
 761     }
 762
 763     /* decide what kind of bitmap this is and how/if we can read it */
 764     if (This->bih.bV5Size == sizeof(BITMAPCOREHEADER))
 765     {
 766         BITMAPCOREHEADER *bch = (BITMAPCOREHEADER*)&This->bih;
 767         TRACE("BITMAPCOREHEADER with depth=%i\n", bch->bcBitCount);
 768         This->bitsperpixel = bch->bcBitCount;
 769         This->read_data_func = BmpFrameDecode_ReadUncompressed;
 770         switch(bch->bcBitCount)
 771         {
 772         case 1:
 773             This->pixelformat = &GUID_WICPixelFormat1bppIndexed;
 774             break;
 775         case 2:
 776             This->pixelformat = &GUID_WICPixelFormat2bppIndexed;
 777             break;
 778         case 4:
 779             This->pixelformat = &GUID_WICPixelFormat4bppIndexed;
 780             break;
 781         case 8:
 782             This->pixelformat = &GUID_WICPixelFormat8bppIndexed;
 783             break;
 784         case 24:
 785             This->pixelformat = &GUID_WICPixelFormat24bppBGR;
 786             break;
 787         default:
 788             This->pixelformat = &GUID_WICPixelFormatUndefined;
 789             WARN("unsupported bit depth %i for BITMAPCOREHEADER\n", bch->bcBitCount);
 790             break;
 791         }
 792     }
 793     else /* struct is compatible with BITMAPINFOHEADER */
 794     {
 795         TRACE("bitmap header=%i compression=%i depth=%i\n", This->bih.bV5Size, This->bih.bV5Compression, This->bih.bV5BitCount);
 796         switch(This->bih.bV5Compression)
 797         {
 798         case BI_RGB:
 799             This->bitsperpixel = This->bih.bV5BitCount;
 800             This->read_data_func = BmpFrameDecode_ReadUncompressed;
 801             switch(This->bih.bV5BitCount)
 802             {
 803             case 1:
 804                 This->pixelformat = &GUID_WICPixelFormat1bppIndexed;
 805                 break;
 806             case 2:
 807                 This->pixelformat = &GUID_WICPixelFormat2bppIndexed;
 808                 break;
 809             case 4:
 810                 This->pixelformat = &GUID_WICPixelFormat4bppIndexed;
 811                 break;
 812             case 8:
 813                 This->pixelformat = &GUID_WICPixelFormat8bppIndexed;
 814                 break;
 815             case 16:
 816                 This->pixelformat = &GUID_WICPixelFormat16bppBGR555;
 817                 break;
 818             case 24:
 819                 This->pixelformat = &GUID_WICPixelFormat24bppBGR;
 820                 break;
 821             case 32:
 822                 This->pixelformat = &GUID_WICPixelFormat32bppBGR;
 823                 break;
 824             default:
 825                 This->pixelformat = &GUID_WICPixelFormatUndefined;
 826                 FIXME("unsupported bit depth %i for uncompressed RGB\n", This->bih.bV5BitCount);
 827             }
 828             break;
 829         case BI_RLE8:
 830             This->bitsperpixel = 32;
 831             This->read_data_func = BmpFrameDecode_ReadRLE8;
 832             This->pixelformat = &GUID_WICPixelFormat32bppBGR;
 833             break;
 834         case BI_RLE4:
 835             This->bitsperpixel = 32;
 836             This->read_data_func = BmpFrameDecode_ReadRLE4;
 837             This->pixelformat = &GUID_WICPixelFormat32bppBGR;
 838             break;
 839         case BI_BITFIELDS:
 840         {
 841             const struct bitfields_format *format;
 842             if (This->bih.bV5Size == sizeof(BITMAPCOREHEADER2))
 843             {
 844                 /* BCH2 doesn't support bitfields; this is Huffman 1D compression */
 845                 This->bitsperpixel = 0;
 846                 This->read_data_func = BmpFrameDecode_ReadUnsupported;
 847                 This->pixelformat = &GUID_WICPixelFormatUndefined;
 848                 FIXME("Huffman 1D compression is unsupported\n");
 849                 break;
 850             }
 851             This->bitsperpixel = This->bih.bV5BitCount;
 852             for (format = bitfields_formats; format->bitcount; format++)
 853             {
 854                 if ((format->bitcount == This->bih.bV5BitCount) &&
 855                     (format->redmask == This->bih.bV5RedMask) &&
 856                     (format->greenmask == This->bih.bV5GreenMask) &&
 857                     (format->bluemask == This->bih.bV5BlueMask) &&
 858                     (format->alphamask == This->bih.bV5AlphaMask))
 859                 {
 860                     This->read_data_func = format->read_data_func;
 861                     This->pixelformat = format->pixelformat;
 862                     break;
 863                 }
 864             }
 865             if (!format->bitcount)
 866             {
 867                 This->read_data_func = BmpFrameDecode_ReadUncompressed;
 868                 This->pixelformat = &GUID_WICPixelFormatUndefined;
 869                 FIXME("unsupported bitfields type depth=%i red=%x green=%x blue=%x alpha=%x\n",
 870                     This->bih.bV5BitCount, This->bih.bV5RedMask, This->bih.bV5GreenMask, This->bih.bV5BlueMask, This->bih.bV5AlphaMask);
 871             }
 872             break;
 873         }
 874         default:
 875             This->bitsperpixel = 0;
 876             This->read_data_func = BmpFrameDecode_ReadUnsupported;
 877             This->pixelformat = &GUID_WICPixelFormatUndefined;
 878             FIXME("unsupported bitmap type header=%i compression=%i depth=%i\n", This->bih.bV5Size, This->bih.bV5Compression, This->bih.bV5BitCount);
 879             break;
 880         }
 881     }
 882
 883     This->initialized = TRUE;
 884
 885     return S_OK;
 886 }
 887
 888 static HRESULT WINAPI BmpDecoder_QueryInterface(IWICBitmapDecoder *iface, REFIID iid,
 889     void **ppv)
 890 {
 891     BmpDecoder *This = (BmpDecoder*)iface;
 892     TRACE("(%p,%s,%p)\n", iface, debugstr_guid(iid), ppv);
 893
 894     if (!ppv) return E_INVALIDARG;
 895
 896     if (IsEqualIID(&IID_IUnknown, iid) || IsEqualIID(&IID_IWICBitmapDecoder, iid))
 897     {
 898         *ppv = This;
 899     }
 900     else
 901     {
 902         *ppv = NULL;
 903         return E_NOINTERFACE;
 904     }
 905
 906     IUnknown_AddRef((IUnknown*)*ppv);
 907     return S_OK;
 908 }
 909
 910 static ULONG WINAPI BmpDecoder_AddRef(IWICBitmapDecoder *iface)
 911 {
 912     BmpDecoder *This = (BmpDecoder*)iface;
 913     ULONG ref = InterlockedIncrement(&This->ref);
 914
 915     TRACE("(%p) refcount=%u\n", iface, ref);
 916
 917     return ref;
 918 }
 919
 920 static ULONG WINAPI BmpDecoder_Release(IWICBitmapDecoder *iface)
 921 {
 922     BmpDecoder *This = (BmpDecoder*)iface;
 923     ULONG ref = InterlockedDecrement(&This->ref);
 924
 925     TRACE("(%p) refcount=%u\n", iface, ref);
 926
 927     if (ref == 0)
 928     {
 929         if (This->stream) IStream_Release(This->stream);
 930         HeapFree(GetProcessHeap(), 0, This->imagedata);
 931         This->lock.DebugInfo->Spare[0] = 0;
 932         DeleteCriticalSection(&This->lock);
 933         HeapFree(GetProcessHeap(), 0, This);
 934     }
 935
 936     return ref;
 937 }
 938
 939 static HRESULT WINAPI BmpDecoder_QueryCapability(IWICBitmapDecoder *iface, IStream *pIStream,
 940     DWORD *pdwCapability)
 941 {
 942     HRESULT hr;
 943     BmpDecoder *This = (BmpDecoder*)iface;
 944
 945     EnterCriticalSection(&This->lock);
 946     hr = BmpDecoder_ReadHeaders(This, pIStream);
 947     LeaveCriticalSection(&This->lock);
 948     if (FAILED(hr)) return hr;
 949
 950     if (This->read_data_func == BmpFrameDecode_ReadUnsupported)
 951         *pdwCapability = 0;
 952     else
 953         *pdwCapability = WICBitmapDecoderCapabilityCanDecodeAllImages;
 954
 955     return S_OK;
 956 }
 957
 958 static HRESULT WINAPI BmpDecoder_Initialize(IWICBitmapDecoder *iface, IStream *pIStream,
 959     WICDecodeOptions cacheOptions)
 960 {
 961     HRESULT hr;
 962     BmpDecoder *This = (BmpDecoder*)iface;
 963
 964     EnterCriticalSection(&This->lock);
 965     hr = BmpDecoder_ReadHeaders(This, pIStream);
 966
 967     if (SUCCEEDED(hr))
 968     {
 969         This->stream = pIStream;
 970         IStream_AddRef(pIStream);
 971     }
 972     LeaveCriticalSection(&This->lock);
 973
 974     return hr;
 975 }
 976
 977 static HRESULT WINAPI BmpDecoder_GetContainerFormat(IWICBitmapDecoder *iface,
 978     GUID *pguidContainerFormat)
 979 {
 980     memcpy(pguidContainerFormat, &GUID_ContainerFormatBmp, sizeof(GUID));
 981     return S_OK;
 982 }
 983
 984 static HRESULT WINAPI BmpDecoder_GetDecoderInfo(IWICBitmapDecoder *iface,
 985     IWICBitmapDecoderInfo **ppIDecoderInfo)
 986 {
 987     HRESULT hr;
 988     IWICComponentInfo *compinfo;
 989
 990     TRACE("(%p,%p)\n", iface, ppIDecoderInfo);
 991
 992     hr = CreateComponentInfo(&CLSID_WICBmpDecoder, &compinfo);
 993     if (FAILED(hr)) return hr;
 994
 995     hr = IWICComponentInfo_QueryInterface(compinfo, &IID_IWICBitmapDecoderInfo,
 996         (void**)ppIDecoderInfo);
 997
 998     IWICComponentInfo_Release(compinfo);
 999
1000     return hr;
1001 }
1002
1003 static HRESULT WINAPI BmpDecoder_CopyPalette(IWICBitmapDecoder *iface,
1004     IWICPalette *pIPalette)
1005 {
1006     TRACE("(%p,%p)\n", iface, pIPalette);
1007
1008     return WINCODEC_ERR_PALETTEUNAVAILABLE;
1009 }
1010
1011 static HRESULT WINAPI BmpDecoder_GetMetadataQueryReader(IWICBitmapDecoder *iface,
1012     IWICMetadataQueryReader **ppIMetadataQueryReader)
1013 {
1014     TRACE("(%p,%p)\n", iface, ppIMetadataQueryReader);
1015     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
1016 }
1017
1018 static HRESULT WINAPI BmpDecoder_GetPreview(IWICBitmapDecoder *iface,
1019     IWICBitmapSource **ppIBitmapSource)
1020 {
1021     TRACE("(%p,%p)\n", iface, ppIBitmapSource);
1022     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
1023 }
1024
1025 static HRESULT WINAPI BmpDecoder_GetColorContexts(IWICBitmapDecoder *iface,
1026     UINT cCount, IWICColorContext **ppIColorContexts, UINT *pcActualCount)
1027 {
1028     TRACE("(%p,%u,%p,%p)\n", iface, cCount, ppIColorContexts, pcActualCount);
1029     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
1030 }
1031
1032 static HRESULT WINAPI BmpDecoder_GetThumbnail(IWICBitmapDecoder *iface,
1033     IWICBitmapSource **ppIThumbnail)
1034 {
1035     TRACE("(%p,%p)\n", iface, ppIThumbnail);
1036     return WINCODEC_ERR_CODECNOTHUMBNAIL;
1037 }
1038
1039 static HRESULT WINAPI BmpDecoder_GetFrameCount(IWICBitmapDecoder *iface,
1040     UINT *pCount)
1041 {
1042     *pCount = 1;
1043     return S_OK;
1044 }
1045
1046 static HRESULT WINAPI BmpDecoder_GetFrame(IWICBitmapDecoder *iface,
1047     UINT index, IWICBitmapFrameDecode **ppIBitmapFrame)
1048 {
1049     BmpDecoder *This = (BmpDecoder*)iface;
1050
1051     if (index != 0) return E_INVALIDARG;
1052
1053     if (!This->stream) return WINCODEC_ERR_WRONGSTATE;
1054
1055     *ppIBitmapFrame = (IWICBitmapFrameDecode*)&This->lpFrameVtbl;
1056     IWICBitmapDecoder_AddRef(iface);
1057
1058     return S_OK;
1059 }
1060
1061 static const IWICBitmapDecoderVtbl BmpDecoder_Vtbl = {
1062     BmpDecoder_QueryInterface,
1063     BmpDecoder_AddRef,
1064     BmpDecoder_Release,
1065     BmpDecoder_QueryCapability,
1066     BmpDecoder_Initialize,
1067     BmpDecoder_GetContainerFormat,
1068     BmpDecoder_GetDecoderInfo,
1069     BmpDecoder_CopyPalette,
1070     BmpDecoder_GetMetadataQueryReader,
1071     BmpDecoder_GetPreview,
1072     BmpDecoder_GetColorContexts,
1073     BmpDecoder_GetThumbnail,
1074     BmpDecoder_GetFrameCount,
1075     BmpDecoder_GetFrame
1076 };
1077
1078 HRESULT BmpDecoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv)
1079 {
1080     BmpDecoder *This;
1081     HRESULT ret;
1082
1083     TRACE("(%p,%s,%p)\n", pUnkOuter, debugstr_guid(iid), ppv);
1084
1085     *ppv = NULL;
1086
1087     if (pUnkOuter) return CLASS_E_NOAGGREGATION;
1088
1089     This = HeapAlloc(GetProcessHeap(), 0, sizeof(BmpDecoder));
1090     if (!This) return E_OUTOFMEMORY;
1091
1092     This->lpVtbl = &BmpDecoder_Vtbl;
1093     This->lpFrameVtbl = &BmpDecoder_FrameVtbl;
1094     This->ref = 1;
1095     This->initialized = FALSE;
1096     This->stream = NULL;
1097     This->imagedata = NULL;
1098     InitializeCriticalSection(&This->lock);
1099     This->lock.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": BmpDecoder.lock");
1100
1101     ret = IUnknown_QueryInterface((IUnknown*)This, iid, ppv);
1102     IUnknown_Release((IUnknown*)This);
1103
1104     return ret;
1105 }