dlls/windowscodecs/pngformat.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 #include "wine/port.h"
  21
  22 #include <stdarg.h>
  23
  24 #ifdef HAVE_PNG_H
  25 #include <png.h>
  26 #endif
  27
  28 #define COBJMACROS
  29
  30 #include "windef.h"
  31 #include "winbase.h"
  32 #include "objbase.h"
  33 #include "wincodec.h"
  34 #include "wincodecsdk.h"
  35
  36 #include "wincodecs_private.h"
  37
  38 #include "wine/debug.h"
  39 #include "wine/library.h"
  40
  41 WINE_DEFAULT_DEBUG_CHANNEL(wincodecs);
  42
  43 #ifdef SONAME_LIBPNG
  44
  45 static void *libpng_handle;
  46 #define MAKE_FUNCPTR(f) static typeof(f) * p##f
  47 MAKE_FUNCPTR(png_create_read_struct);
  48 MAKE_FUNCPTR(png_create_info_struct);
  49 MAKE_FUNCPTR(png_create_write_struct);
  50 MAKE_FUNCPTR(png_destroy_read_struct);
  51 MAKE_FUNCPTR(png_destroy_write_struct);
  52 MAKE_FUNCPTR(png_error);
  53 MAKE_FUNCPTR(png_get_bit_depth);
  54 MAKE_FUNCPTR(png_get_color_type);
  55 MAKE_FUNCPTR(png_get_error_ptr);
  56 MAKE_FUNCPTR(png_get_image_height);
  57 MAKE_FUNCPTR(png_get_image_width);
  58 MAKE_FUNCPTR(png_get_io_ptr);
  59 MAKE_FUNCPTR(png_get_pHYs);
  60 MAKE_FUNCPTR(png_get_PLTE);
  61 MAKE_FUNCPTR(png_get_tRNS);
  62 MAKE_FUNCPTR(png_set_bgr);
  63 MAKE_FUNCPTR(png_set_error_fn);
  64 #if HAVE_PNG_SET_EXPAND_GRAY_1_2_4_TO_8
  65 MAKE_FUNCPTR(png_set_expand_gray_1_2_4_to_8);
  66 #else
  67 MAKE_FUNCPTR(png_set_gray_1_2_4_to_8);
  68 #endif
  69 MAKE_FUNCPTR(png_set_filler);
  70 MAKE_FUNCPTR(png_set_gray_to_rgb);
  71 MAKE_FUNCPTR(png_set_IHDR);
  72 MAKE_FUNCPTR(png_set_pHYs);
  73 MAKE_FUNCPTR(png_set_read_fn);
  74 MAKE_FUNCPTR(png_set_strip_16);
  75 MAKE_FUNCPTR(png_set_tRNS_to_alpha);
  76 MAKE_FUNCPTR(png_set_write_fn);
  77 MAKE_FUNCPTR(png_read_end);
  78 MAKE_FUNCPTR(png_read_image);
  79 MAKE_FUNCPTR(png_read_info);
  80 MAKE_FUNCPTR(png_write_end);
  81 MAKE_FUNCPTR(png_write_info);
  82 MAKE_FUNCPTR(png_write_rows);
  83 #undef MAKE_FUNCPTR
  84
  85 static void *load_libpng(void)
  86 {
  87     if((libpng_handle = wine_dlopen(SONAME_LIBPNG, RTLD_NOW, NULL, 0)) != NULL) {
  88
  89 #define LOAD_FUNCPTR(f) \
  90     if((p##f = wine_dlsym(libpng_handle, #f, NULL, 0)) == NULL) { \
  91         libpng_handle = NULL; \
  92         return NULL; \
  93     }
  94         LOAD_FUNCPTR(png_create_read_struct);
  95         LOAD_FUNCPTR(png_create_info_struct);
  96         LOAD_FUNCPTR(png_create_write_struct);
  97         LOAD_FUNCPTR(png_destroy_read_struct);
  98         LOAD_FUNCPTR(png_destroy_write_struct);
  99         LOAD_FUNCPTR(png_error);
 100         LOAD_FUNCPTR(png_get_bit_depth);
 101         LOAD_FUNCPTR(png_get_color_type);
 102         LOAD_FUNCPTR(png_get_error_ptr);
 103         LOAD_FUNCPTR(png_get_image_height);
 104         LOAD_FUNCPTR(png_get_image_width);
 105         LOAD_FUNCPTR(png_get_io_ptr);
 106         LOAD_FUNCPTR(png_get_pHYs);
 107         LOAD_FUNCPTR(png_get_PLTE);
 108         LOAD_FUNCPTR(png_get_tRNS);
 109         LOAD_FUNCPTR(png_set_bgr);
 110         LOAD_FUNCPTR(png_set_error_fn);
 111 #if HAVE_PNG_SET_EXPAND_GRAY_1_2_4_TO_8
 112         LOAD_FUNCPTR(png_set_expand_gray_1_2_4_to_8);
 113 #else
 114         LOAD_FUNCPTR(png_set_gray_1_2_4_to_8);
 115 #endif
 116         LOAD_FUNCPTR(png_set_filler);
 117         LOAD_FUNCPTR(png_set_gray_to_rgb);
 118         LOAD_FUNCPTR(png_set_IHDR);
 119         LOAD_FUNCPTR(png_set_pHYs);
 120         LOAD_FUNCPTR(png_set_read_fn);
 121         LOAD_FUNCPTR(png_set_strip_16);
 122         LOAD_FUNCPTR(png_set_tRNS_to_alpha);
 123         LOAD_FUNCPTR(png_set_write_fn);
 124         LOAD_FUNCPTR(png_read_end);
 125         LOAD_FUNCPTR(png_read_image);
 126         LOAD_FUNCPTR(png_read_info);
 127         LOAD_FUNCPTR(png_write_end);
 128         LOAD_FUNCPTR(png_write_info);
 129         LOAD_FUNCPTR(png_write_rows);
 130
 131 #undef LOAD_FUNCPTR
 132     }
 133     return libpng_handle;
 134 }
 135
 136 static void user_error_fn(png_structp png_ptr, png_const_charp error_message)
 137 {
 138     jmp_buf *pjmpbuf;
 139
 140     /* This uses setjmp/longjmp just like the default. We can't use the
 141      * default because there's no way to access the jmp buffer in the png_struct
 142      * that works in 1.2 and 1.4 and allows us to dynamically load libpng. */
 143     WARN("PNG error: %s\n", debugstr_a(error_message));
 144     pjmpbuf = ppng_get_error_ptr(png_ptr);
 145     longjmp(*pjmpbuf, 1);
 146 }
 147
 148 static void user_warning_fn(png_structp png_ptr, png_const_charp warning_message)
 149 {
 150     WARN("PNG warning: %s\n", debugstr_a(warning_message));
 151 }
 152
 153 typedef struct {
 154     IWICBitmapDecoder IWICBitmapDecoder_iface;
 155     IWICBitmapFrameDecode IWICBitmapFrameDecode_iface;
 156     IWICMetadataBlockReader IWICMetadataBlockReader_iface;
 157     LONG ref;
 158     png_structp png_ptr;
 159     png_infop info_ptr;
 160     png_infop end_info;
 161     BOOL initialized;
 162     int bpp;
 163     int width, height;
 164     UINT stride;
 165     const WICPixelFormatGUID *format;
 166     BYTE *image_bits;
 167     CRITICAL_SECTION lock; /* must be held when png structures are accessed or initialized is set */
 168 } PngDecoder;
 169
 170 static inline PngDecoder *impl_from_IWICBitmapDecoder(IWICBitmapDecoder *iface)
 171 {
 172     return CONTAINING_RECORD(iface, PngDecoder, IWICBitmapDecoder_iface);
 173 }
 174
 175 static inline PngDecoder *impl_from_IWICBitmapFrameDecode(IWICBitmapFrameDecode *iface)
 176 {
 177     return CONTAINING_RECORD(iface, PngDecoder, IWICBitmapFrameDecode_iface);
 178 }
 179
 180 static inline PngDecoder *impl_from_IWICMetadataBlockReader(IWICMetadataBlockReader *iface)
 181 {
 182     return CONTAINING_RECORD(iface, PngDecoder, IWICMetadataBlockReader_iface);
 183 }
 184
 185 static const IWICBitmapFrameDecodeVtbl PngDecoder_FrameVtbl;
 186
 187 static HRESULT WINAPI PngDecoder_QueryInterface(IWICBitmapDecoder *iface, REFIID iid,
 188     void **ppv)
 189 {
 190     PngDecoder *This = impl_from_IWICBitmapDecoder(iface);
 191     TRACE("(%p,%s,%p)\n", iface, debugstr_guid(iid), ppv);
 192
 193     if (!ppv) return E_INVALIDARG;
 194
 195     if (IsEqualIID(&IID_IUnknown, iid) || IsEqualIID(&IID_IWICBitmapDecoder, iid))
 196     {
 197         *ppv = This;
 198     }
 199     else
 200     {
 201         *ppv = NULL;
 202         return E_NOINTERFACE;
 203     }
 204
 205     IUnknown_AddRef((IUnknown*)*ppv);
 206     return S_OK;
 207 }
 208
 209 static ULONG WINAPI PngDecoder_AddRef(IWICBitmapDecoder *iface)
 210 {
 211     PngDecoder *This = impl_from_IWICBitmapDecoder(iface);
 212     ULONG ref = InterlockedIncrement(&This->ref);
 213
 214     TRACE("(%p) refcount=%u\n", iface, ref);
 215
 216     return ref;
 217 }
 218
 219 static ULONG WINAPI PngDecoder_Release(IWICBitmapDecoder *iface)
 220 {
 221     PngDecoder *This = impl_from_IWICBitmapDecoder(iface);
 222     ULONG ref = InterlockedDecrement(&This->ref);
 223
 224     TRACE("(%p) refcount=%u\n", iface, ref);
 225
 226     if (ref == 0)
 227     {
 228         if (This->png_ptr)
 229             ppng_destroy_read_struct(&This->png_ptr, &This->info_ptr, &This->end_info);
 230         This->lock.DebugInfo->Spare[0] = 0;
 231         DeleteCriticalSection(&This->lock);
 232         HeapFree(GetProcessHeap(), 0, This->image_bits);
 233         HeapFree(GetProcessHeap(), 0, This);
 234     }
 235
 236     return ref;
 237 }
 238
 239 static HRESULT WINAPI PngDecoder_QueryCapability(IWICBitmapDecoder *iface, IStream *pIStream,
 240     DWORD *pdwCapability)
 241 {
 242     FIXME("(%p,%p,%p): stub\n", iface, pIStream, pdwCapability);
 243     return E_NOTIMPL;
 244 }
 245
 246 static void user_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 247 {
 248     IStream *stream = ppng_get_io_ptr(png_ptr);
 249     HRESULT hr;
 250     ULONG bytesread;
 251
 252     hr = IStream_Read(stream, data, length, &bytesread);
 253     if (FAILED(hr) || bytesread != length)
 254     {
 255         ppng_error(png_ptr, "failed reading data");
 256     }
 257 }
 258
 259 static HRESULT WINAPI PngDecoder_Initialize(IWICBitmapDecoder *iface, IStream *pIStream,
 260     WICDecodeOptions cacheOptions)
 261 {
 262     PngDecoder *This = impl_from_IWICBitmapDecoder(iface);
 263     LARGE_INTEGER seek;
 264     HRESULT hr=S_OK;
 265     png_bytep *row_pointers=NULL;
 266     UINT image_size;
 267     UINT i;
 268     int color_type, bit_depth;
 269     png_bytep trans;
 270     int num_trans;
 271     png_uint_32 transparency;
 272     png_color_16p trans_values;
 273     jmp_buf jmpbuf;
 274
 275     TRACE("(%p,%p,%x)\n", iface, pIStream, cacheOptions);
 276
 277     EnterCriticalSection(&This->lock);
 278
 279     /* initialize libpng */
 280     This->png_ptr = ppng_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
 281     if (!This->png_ptr)
 282     {
 283         hr = E_FAIL;
 284         goto end;
 285     }
 286
 287     This->info_ptr = ppng_create_info_struct(This->png_ptr);
 288     if (!This->info_ptr)
 289     {
 290         ppng_destroy_read_struct(&This->png_ptr, NULL, NULL);
 291         This->png_ptr = NULL;
 292         hr = E_FAIL;
 293         goto end;
 294     }
 295
 296     This->end_info = ppng_create_info_struct(This->png_ptr);
 297     if (!This->info_ptr)
 298     {
 299         ppng_destroy_read_struct(&This->png_ptr, &This->info_ptr, NULL);
 300         This->png_ptr = NULL;
 301         hr = E_FAIL;
 302         goto end;
 303     }
 304
 305     /* set up setjmp/longjmp error handling */
 306     if (setjmp(jmpbuf))
 307     {
 308         ppng_destroy_read_struct(&This->png_ptr, &This->info_ptr, &This->end_info);
 309         HeapFree(GetProcessHeap(), 0, row_pointers);
 310         This->png_ptr = NULL;
 311         hr = E_FAIL;
 312         goto end;
 313     }
 314     ppng_set_error_fn(This->png_ptr, jmpbuf, user_error_fn, user_warning_fn);
 315
 316     /* seek to the start of the stream */
 317     seek.QuadPart = 0;
 318     hr = IStream_Seek(pIStream, seek, STREAM_SEEK_SET, NULL);
 319     if (FAILED(hr)) goto end;
 320
 321     /* set up custom i/o handling */
 322     ppng_set_read_fn(This->png_ptr, pIStream, user_read_data);
 323
 324     /* read the header */
 325     ppng_read_info(This->png_ptr, This->info_ptr);
 326
 327     /* choose a pixel format */
 328     color_type = ppng_get_color_type(This->png_ptr, This->info_ptr);
 329     bit_depth = ppng_get_bit_depth(This->png_ptr, This->info_ptr);
 330
 331     /* check for color-keyed alpha */
 332     transparency = ppng_get_tRNS(This->png_ptr, This->info_ptr, &trans, &num_trans, &trans_values);
 333
 334     if (transparency && color_type != PNG_COLOR_TYPE_PALETTE)
 335     {
 336         /* expand to RGBA */
 337         if (color_type == PNG_COLOR_TYPE_GRAY)
 338         {
 339             if (bit_depth < 8)
 340             {
 341 #if HAVE_PNG_SET_EXPAND_GRAY_1_2_4_TO_8
 342                 ppng_set_expand_gray_1_2_4_to_8(This->png_ptr);
 343 #else
 344                 ppng_set_gray_1_2_4_to_8(This->png_ptr);
 345 #endif
 346                 bit_depth = 8;
 347             }
 348             ppng_set_gray_to_rgb(This->png_ptr);
 349         }
 350         ppng_set_tRNS_to_alpha(This->png_ptr);
 351         color_type = PNG_COLOR_TYPE_RGB_ALPHA;
 352     }
 353
 354     switch (color_type)
 355     {
 356     case PNG_COLOR_TYPE_GRAY:
 357         This->bpp = bit_depth;
 358         switch (bit_depth)
 359         {
 360         case 1: This->format = &GUID_WICPixelFormatBlackWhite; break;
 361         case 2: This->format = &GUID_WICPixelFormat2bppGray; break;
 362         case 4: This->format = &GUID_WICPixelFormat4bppGray; break;
 363         case 8: This->format = &GUID_WICPixelFormat8bppGray; break;
 364         case 16: This->format = &GUID_WICPixelFormat16bppGray; break;
 365         default:
 366             ERR("invalid grayscale bit depth: %i\n", bit_depth);
 367             hr = E_FAIL;
 368             goto end;
 369         }
 370         break;
 371     case PNG_COLOR_TYPE_GRAY_ALPHA:
 372         /* WIC does not support grayscale alpha formats so use RGBA */
 373         ppng_set_gray_to_rgb(This->png_ptr);
 374         /* fall through */
 375     case PNG_COLOR_TYPE_RGB_ALPHA:
 376         This->bpp = bit_depth * 4;
 377         switch (bit_depth)
 378         {
 379         case 8:
 380             ppng_set_bgr(This->png_ptr);
 381             This->format = &GUID_WICPixelFormat32bppBGRA;
 382             break;
 383         case 16: This->format = &GUID_WICPixelFormat64bppRGBA; break;
 384         default:
 385             ERR("invalid RGBA bit depth: %i\n", bit_depth);
 386             hr = E_FAIL;
 387             goto end;
 388         }
 389         break;
 390     case PNG_COLOR_TYPE_PALETTE:
 391         This->bpp = bit_depth;
 392         switch (bit_depth)
 393         {
 394         case 1: This->format = &GUID_WICPixelFormat1bppIndexed; break;
 395         case 2: This->format = &GUID_WICPixelFormat2bppIndexed; break;
 396         case 4: This->format = &GUID_WICPixelFormat4bppIndexed; break;
 397         case 8: This->format = &GUID_WICPixelFormat8bppIndexed; break;
 398         default:
 399             ERR("invalid indexed color bit depth: %i\n", bit_depth);
 400             hr = E_FAIL;
 401             goto end;
 402         }
 403         break;
 404     case PNG_COLOR_TYPE_RGB:
 405         This->bpp = bit_depth * 3;
 406         switch (bit_depth)
 407         {
 408         case 8:
 409             ppng_set_bgr(This->png_ptr);
 410             This->format = &GUID_WICPixelFormat24bppBGR;
 411             break;
 412         case 16: This->format = &GUID_WICPixelFormat48bppRGB; break;
 413         default:
 414             ERR("invalid RGB color bit depth: %i\n", bit_depth);
 415             hr = E_FAIL;
 416             goto end;
 417         }
 418         break;
 419     default:
 420         ERR("invalid color type %i\n", color_type);
 421         hr = E_FAIL;
 422         goto end;
 423     }
 424
 425     /* read the image data */
 426     This->width = ppng_get_image_width(This->png_ptr, This->info_ptr);
 427     This->height = ppng_get_image_height(This->png_ptr, This->info_ptr);
 428     This->stride = This->width * This->bpp;
 429     image_size = This->stride * This->height;
 430
 431     This->image_bits = HeapAlloc(GetProcessHeap(), 0, image_size);
 432     if (!This->image_bits)
 433     {
 434         hr = E_OUTOFMEMORY;
 435         goto end;
 436     }
 437
 438     row_pointers = HeapAlloc(GetProcessHeap(), 0, sizeof(png_bytep)*This->height);
 439     if (!row_pointers)
 440     {
 441         hr = E_OUTOFMEMORY;
 442         goto end;
 443     }
 444
 445     for (i=0; i<This->height; i++)
 446         row_pointers[i] = This->image_bits + i * This->stride;
 447
 448     ppng_read_image(This->png_ptr, row_pointers);
 449
 450     HeapFree(GetProcessHeap(), 0, row_pointers);
 451     row_pointers = NULL;
 452
 453     ppng_read_end(This->png_ptr, This->end_info);
 454
 455     This->initialized = TRUE;
 456
 457 end:
 458
 459     LeaveCriticalSection(&This->lock);
 460
 461     return hr;
 462 }
 463
 464 static HRESULT WINAPI PngDecoder_GetContainerFormat(IWICBitmapDecoder *iface,
 465     GUID *pguidContainerFormat)
 466 {
 467     memcpy(pguidContainerFormat, &GUID_ContainerFormatPng, sizeof(GUID));
 468     return S_OK;
 469 }
 470
 471 static HRESULT WINAPI PngDecoder_GetDecoderInfo(IWICBitmapDecoder *iface,
 472     IWICBitmapDecoderInfo **ppIDecoderInfo)
 473 {
 474     HRESULT hr;
 475     IWICComponentInfo *compinfo;
 476
 477     TRACE("(%p,%p)\n", iface, ppIDecoderInfo);
 478
 479     hr = CreateComponentInfo(&CLSID_WICPngDecoder, &compinfo);
 480     if (FAILED(hr)) return hr;
 481
 482     hr = IWICComponentInfo_QueryInterface(compinfo, &IID_IWICBitmapDecoderInfo,
 483         (void**)ppIDecoderInfo);
 484
 485     IWICComponentInfo_Release(compinfo);
 486
 487     return hr;
 488 }
 489
 490 static HRESULT WINAPI PngDecoder_CopyPalette(IWICBitmapDecoder *iface,
 491     IWICPalette *pIPalette)
 492 {
 493     FIXME("(%p,%p): stub\n", iface, pIPalette);
 494     return E_NOTIMPL;
 495 }
 496
 497 static HRESULT WINAPI PngDecoder_GetMetadataQueryReader(IWICBitmapDecoder *iface,
 498     IWICMetadataQueryReader **ppIMetadataQueryReader)
 499 {
 500     FIXME("(%p,%p): stub\n", iface, ppIMetadataQueryReader);
 501     return E_NOTIMPL;
 502 }
 503
 504 static HRESULT WINAPI PngDecoder_GetPreview(IWICBitmapDecoder *iface,
 505     IWICBitmapSource **ppIBitmapSource)
 506 {
 507     FIXME("(%p,%p): stub\n", iface, ppIBitmapSource);
 508     return E_NOTIMPL;
 509 }
 510
 511 static HRESULT WINAPI PngDecoder_GetColorContexts(IWICBitmapDecoder *iface,
 512     UINT cCount, IWICColorContext **ppIColorContexts, UINT *pcActualCount)
 513 {
 514     FIXME("(%p,%u,%p,%p)\n", iface, cCount, ppIColorContexts, pcActualCount);
 515     return E_NOTIMPL;
 516 }
 517
 518 static HRESULT WINAPI PngDecoder_GetThumbnail(IWICBitmapDecoder *iface,
 519     IWICBitmapSource **ppIThumbnail)
 520 {
 521     TRACE("(%p,%p)\n", iface, ppIThumbnail);
 522     return WINCODEC_ERR_CODECNOTHUMBNAIL;
 523 }
 524
 525 static HRESULT WINAPI PngDecoder_GetFrameCount(IWICBitmapDecoder *iface,
 526     UINT *pCount)
 527 {
 528     *pCount = 1;
 529     return S_OK;
 530 }
 531
 532 static HRESULT WINAPI PngDecoder_GetFrame(IWICBitmapDecoder *iface,
 533     UINT index, IWICBitmapFrameDecode **ppIBitmapFrame)
 534 {
 535     PngDecoder *This = impl_from_IWICBitmapDecoder(iface);
 536     TRACE("(%p,%u,%p)\n", iface, index, ppIBitmapFrame);
 537
 538     if (!This->initialized) return WINCODEC_ERR_NOTINITIALIZED;
 539
 540     if (index != 0) return E_INVALIDARG;
 541
 542     IWICBitmapDecoder_AddRef(iface);
 543
 544     *ppIBitmapFrame = &This->IWICBitmapFrameDecode_iface;
 545
 546     return S_OK;
 547 }
 548
 549 static const IWICBitmapDecoderVtbl PngDecoder_Vtbl = {
 550     PngDecoder_QueryInterface,
 551     PngDecoder_AddRef,
 552     PngDecoder_Release,
 553     PngDecoder_QueryCapability,
 554     PngDecoder_Initialize,
 555     PngDecoder_GetContainerFormat,
 556     PngDecoder_GetDecoderInfo,
 557     PngDecoder_CopyPalette,
 558     PngDecoder_GetMetadataQueryReader,
 559     PngDecoder_GetPreview,
 560     PngDecoder_GetColorContexts,
 561     PngDecoder_GetThumbnail,
 562     PngDecoder_GetFrameCount,
 563     PngDecoder_GetFrame
 564 };
 565
 566 static HRESULT WINAPI PngDecoder_Frame_QueryInterface(IWICBitmapFrameDecode *iface, REFIID iid,
 567     void **ppv)
 568 {
 569     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 570     if (!ppv) return E_INVALIDARG;
 571
 572     if (IsEqualIID(&IID_IUnknown, iid) ||
 573         IsEqualIID(&IID_IWICBitmapSource, iid) ||
 574         IsEqualIID(&IID_IWICBitmapFrameDecode, iid))
 575     {
 576         *ppv = iface;
 577     }
 578     else if (IsEqualIID(&IID_IWICMetadataBlockReader, iid))
 579     {
 580         *ppv = (void**)&This->IWICMetadataBlockReader_iface;
 581     }
 582     else
 583     {
 584         *ppv = NULL;
 585         return E_NOINTERFACE;
 586     }
 587
 588     IUnknown_AddRef((IUnknown*)*ppv);
 589     return S_OK;
 590 }
 591
 592 static ULONG WINAPI PngDecoder_Frame_AddRef(IWICBitmapFrameDecode *iface)
 593 {
 594     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 595     return IUnknown_AddRef((IUnknown*)This);
 596 }
 597
 598 static ULONG WINAPI PngDecoder_Frame_Release(IWICBitmapFrameDecode *iface)
 599 {
 600     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 601     return IUnknown_Release((IUnknown*)This);
 602 }
 603
 604 static HRESULT WINAPI PngDecoder_Frame_GetSize(IWICBitmapFrameDecode *iface,
 605     UINT *puiWidth, UINT *puiHeight)
 606 {
 607     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 608     *puiWidth = This->width;
 609     *puiHeight = This->height;
 610     TRACE("(%p)->(%u,%u)\n", iface, *puiWidth, *puiHeight);
 611     return S_OK;
 612 }
 613
 614 static HRESULT WINAPI PngDecoder_Frame_GetPixelFormat(IWICBitmapFrameDecode *iface,
 615     WICPixelFormatGUID *pPixelFormat)
 616 {
 617     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 618     TRACE("(%p,%p)\n", iface, pPixelFormat);
 619
 620     memcpy(pPixelFormat, This->format, sizeof(GUID));
 621
 622     return S_OK;
 623 }
 624
 625 static HRESULT WINAPI PngDecoder_Frame_GetResolution(IWICBitmapFrameDecode *iface,
 626     double *pDpiX, double *pDpiY)
 627 {
 628     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 629     png_uint_32 ret, xres, yres;
 630     int unit_type;
 631
 632     EnterCriticalSection(&This->lock);
 633
 634     ret = ppng_get_pHYs(This->png_ptr, This->info_ptr, &xres, &yres, &unit_type);
 635
 636     if (ret && unit_type == PNG_RESOLUTION_METER)
 637     {
 638         *pDpiX = xres * 0.0254;
 639         *pDpiY = yres * 0.0254;
 640     }
 641     else
 642     {
 643         WARN("no pHYs block present\n");
 644         *pDpiX = *pDpiY = 96.0;
 645     }
 646
 647     LeaveCriticalSection(&This->lock);
 648
 649     TRACE("(%p)->(%0.2f,%0.2f)\n", iface, *pDpiX, *pDpiY);
 650
 651     return S_OK;
 652 }
 653
 654 static HRESULT WINAPI PngDecoder_Frame_CopyPalette(IWICBitmapFrameDecode *iface,
 655     IWICPalette *pIPalette)
 656 {
 657     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 658     png_uint_32 ret;
 659     png_colorp png_palette;
 660     int num_palette;
 661     WICColor palette[256];
 662     png_bytep trans;
 663     int num_trans;
 664     png_color_16p trans_values;
 665     int i;
 666     HRESULT hr=S_OK;
 667
 668     TRACE("(%p,%p)\n", iface, pIPalette);
 669
 670     EnterCriticalSection(&This->lock);
 671
 672     ret = ppng_get_PLTE(This->png_ptr, This->info_ptr, &png_palette, &num_palette);
 673     if (!ret)
 674     {
 675         hr = WINCODEC_ERR_PALETTEUNAVAILABLE;
 676         goto end;
 677     }
 678
 679     if (num_palette > 256)
 680     {
 681         ERR("palette has %i colors?!\n", num_palette);
 682         hr = E_FAIL;
 683         goto end;
 684     }
 685
 686     for (i=0; i<num_palette; i++)
 687     {
 688         palette[i] = (0xff000000|
 689                       png_palette[i].red << 16|
 690                       png_palette[i].green << 8|
 691                       png_palette[i].blue);
 692     }
 693
 694     ret = ppng_get_tRNS(This->png_ptr, This->info_ptr, &trans, &num_trans, &trans_values);
 695     if (ret)
 696     {
 697         for (i=0; i<num_trans; i++)
 698         {
 699             palette[trans[i]] = 0x00000000;
 700         }
 701     }
 702
 703 end:
 704
 705     LeaveCriticalSection(&This->lock);
 706
 707     if (SUCCEEDED(hr))
 708         hr = IWICPalette_InitializeCustom(pIPalette, palette, num_palette);
 709
 710     return hr;
 711 }
 712
 713 static HRESULT WINAPI PngDecoder_Frame_CopyPixels(IWICBitmapFrameDecode *iface,
 714     const WICRect *prc, UINT cbStride, UINT cbBufferSize, BYTE *pbBuffer)
 715 {
 716     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 717     TRACE("(%p,%p,%u,%u,%p)\n", iface, prc, cbStride, cbBufferSize, pbBuffer);
 718
 719     return copy_pixels(This->bpp, This->image_bits,
 720         This->width, This->height, This->stride,
 721         prc, cbStride, cbBufferSize, pbBuffer);
 722 }
 723
 724 static HRESULT WINAPI PngDecoder_Frame_GetMetadataQueryReader(IWICBitmapFrameDecode *iface,
 725     IWICMetadataQueryReader **ppIMetadataQueryReader)
 726 {
 727     FIXME("(%p,%p): stub\n", iface, ppIMetadataQueryReader);
 728     return E_NOTIMPL;
 729 }
 730
 731 static HRESULT WINAPI PngDecoder_Frame_GetColorContexts(IWICBitmapFrameDecode *iface,
 732     UINT cCount, IWICColorContext **ppIColorContexts, UINT *pcActualCount)
 733 {
 734     FIXME("(%p,%u,%p,%p): stub\n", iface, cCount, ppIColorContexts, pcActualCount);
 735     return E_NOTIMPL;
 736 }
 737
 738 static HRESULT WINAPI PngDecoder_Frame_GetThumbnail(IWICBitmapFrameDecode *iface,
 739     IWICBitmapSource **ppIThumbnail)
 740 {
 741     FIXME("(%p,%p): stub\n", iface, ppIThumbnail);
 742     return E_NOTIMPL;
 743 }
 744
 745 static const IWICBitmapFrameDecodeVtbl PngDecoder_FrameVtbl = {
 746     PngDecoder_Frame_QueryInterface,
 747     PngDecoder_Frame_AddRef,
 748     PngDecoder_Frame_Release,
 749     PngDecoder_Frame_GetSize,
 750     PngDecoder_Frame_GetPixelFormat,
 751     PngDecoder_Frame_GetResolution,
 752     PngDecoder_Frame_CopyPalette,
 753     PngDecoder_Frame_CopyPixels,
 754     PngDecoder_Frame_GetMetadataQueryReader,
 755     PngDecoder_Frame_GetColorContexts,
 756     PngDecoder_Frame_GetThumbnail
 757 };
 758
 759 static HRESULT WINAPI PngDecoder_Block_QueryInterface(IWICMetadataBlockReader *iface, REFIID iid,
 760     void **ppv)
 761 {
 762     PngDecoder *This = impl_from_IWICMetadataBlockReader(iface);
 763     return IWICBitmapFrameDecode_QueryInterface(&This->IWICBitmapFrameDecode_iface, iid, ppv);
 764 }
 765
 766 static ULONG WINAPI PngDecoder_Block_AddRef(IWICMetadataBlockReader *iface)
 767 {
 768     PngDecoder *This = impl_from_IWICMetadataBlockReader(iface);
 769     return IUnknown_AddRef((IUnknown*)This);
 770 }
 771
 772 static ULONG WINAPI PngDecoder_Block_Release(IWICMetadataBlockReader *iface)
 773 {
 774     PngDecoder *This = impl_from_IWICMetadataBlockReader(iface);
 775     return IUnknown_Release((IUnknown*)This);
 776 }
 777
 778 static HRESULT WINAPI PngDecoder_Block_GetContainerFormat(IWICMetadataBlockReader *iface,
 779     GUID *pguidContainerFormat)
 780 {
 781     if (!pguidContainerFormat) return E_INVALIDARG;
 782     memcpy(pguidContainerFormat, &GUID_ContainerFormatPng, sizeof(GUID));
 783     return S_OK;
 784 }
 785
 786 static HRESULT WINAPI PngDecoder_Block_GetCount(IWICMetadataBlockReader *iface,
 787     UINT *pcCount)
 788 {
 789     FIXME("%p,%p: stub\n", iface, pcCount);
 790     return E_NOTIMPL;
 791 }
 792
 793 static HRESULT WINAPI PngDecoder_Block_GetReaderByIndex(IWICMetadataBlockReader *iface,
 794     UINT nIndex, IWICMetadataReader **ppIMetadataReader)
 795 {
 796     FIXME("%p,%d,%p\n", iface, nIndex, ppIMetadataReader);
 797     return E_NOTIMPL;
 798 }
 799
 800 static HRESULT WINAPI PngDecoder_Block_GetEnumerator(IWICMetadataBlockReader *iface,
 801     IEnumUnknown **ppIEnumMetadata)
 802 {
 803     FIXME("%p,%p\n", iface, ppIEnumMetadata);
 804     return E_NOTIMPL;
 805 }
 806
 807 static const IWICMetadataBlockReaderVtbl PngDecoder_BlockVtbl = {
 808     PngDecoder_Block_QueryInterface,
 809     PngDecoder_Block_AddRef,
 810     PngDecoder_Block_Release,
 811     PngDecoder_Block_GetContainerFormat,
 812     PngDecoder_Block_GetCount,
 813     PngDecoder_Block_GetReaderByIndex,
 814     PngDecoder_Block_GetEnumerator,
 815 };
 816
 817 HRESULT PngDecoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv)
 818 {
 819     PngDecoder *This;
 820     HRESULT ret;
 821
 822     TRACE("(%p,%s,%p)\n", pUnkOuter, debugstr_guid(iid), ppv);
 823
 824     *ppv = NULL;
 825
 826     if (pUnkOuter) return CLASS_E_NOAGGREGATION;
 827
 828     if (!libpng_handle && !load_libpng())
 829     {
 830         ERR("Failed reading PNG because unable to find %s\n",SONAME_LIBPNG);
 831         return E_FAIL;
 832     }
 833
 834     This = HeapAlloc(GetProcessHeap(), 0, sizeof(PngDecoder));
 835     if (!This) return E_OUTOFMEMORY;
 836
 837     This->IWICBitmapDecoder_iface.lpVtbl = &PngDecoder_Vtbl;
 838     This->IWICBitmapFrameDecode_iface.lpVtbl = &PngDecoder_FrameVtbl;
 839     This->IWICMetadataBlockReader_iface.lpVtbl = &PngDecoder_BlockVtbl;
 840     This->ref = 1;
 841     This->png_ptr = NULL;
 842     This->info_ptr = NULL;
 843     This->end_info = NULL;
 844     This->initialized = FALSE;
 845     This->image_bits = NULL;
 846     InitializeCriticalSection(&This->lock);
 847     This->lock.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": PngDecoder.lock");
 848
 849     ret = IUnknown_QueryInterface((IUnknown*)This, iid, ppv);
 850     IUnknown_Release((IUnknown*)This);
 851
 852     return ret;
 853 }
 854
 855 struct png_pixelformat {
 856     const WICPixelFormatGUID *guid;
 857     UINT bpp;
 858     int bit_depth;
 859     int color_type;
 860     BOOL remove_filler;
 861     BOOL swap_rgb;
 862 };
 863
 864 static const struct png_pixelformat formats[] = {
 865     {&GUID_WICPixelFormat24bppBGR, 24, 8, PNG_COLOR_TYPE_RGB, 0, 1},
 866     {&GUID_WICPixelFormatBlackWhite, 1, 1, PNG_COLOR_TYPE_GRAY, 0, 0},
 867     {&GUID_WICPixelFormat2bppGray, 2, 2, PNG_COLOR_TYPE_GRAY, 0, 0},
 868     {&GUID_WICPixelFormat4bppGray, 4, 4, PNG_COLOR_TYPE_GRAY, 0, 0},
 869     {&GUID_WICPixelFormat8bppGray, 8, 8, PNG_COLOR_TYPE_GRAY, 0, 0},
 870     {&GUID_WICPixelFormat16bppGray, 16, 16, PNG_COLOR_TYPE_GRAY, 0, 0},
 871     {&GUID_WICPixelFormat32bppBGR, 32, 8, PNG_COLOR_TYPE_RGB, 1, 1},
 872     {&GUID_WICPixelFormat32bppBGRA, 32, 8, PNG_COLOR_TYPE_RGB_ALPHA, 0, 1},
 873     {&GUID_WICPixelFormat48bppRGB, 48, 16, PNG_COLOR_TYPE_RGB, 0, 0},
 874     {&GUID_WICPixelFormat64bppRGBA, 64, 16, PNG_COLOR_TYPE_RGB_ALPHA, 0, 0},
 875     {NULL},
 876 };
 877
 878 typedef struct PngEncoder {
 879     IWICBitmapEncoder IWICBitmapEncoder_iface;
 880     IWICBitmapFrameEncode IWICBitmapFrameEncode_iface;
 881     LONG ref;
 882     IStream *stream;
 883     png_structp png_ptr;
 884     png_infop info_ptr;
 885     UINT frame_count;
 886     BOOL frame_initialized;
 887     const struct png_pixelformat *format;
 888     BOOL info_written;
 889     UINT width, height;
 890     double xres, yres;
 891     UINT lines_written;
 892     BOOL frame_committed;
 893     BOOL committed;
 894     CRITICAL_SECTION lock;
 895 } PngEncoder;
 896
 897 static inline PngEncoder *impl_from_IWICBitmapEncoder(IWICBitmapEncoder *iface)
 898 {
 899     return CONTAINING_RECORD(iface, PngEncoder, IWICBitmapEncoder_iface);
 900 }
 901
 902 static inline PngEncoder *impl_from_IWICBitmapFrameEncode(IWICBitmapFrameEncode *iface)
 903 {
 904     return CONTAINING_RECORD(iface, PngEncoder, IWICBitmapFrameEncode_iface);
 905 }
 906
 907 static HRESULT WINAPI PngFrameEncode_QueryInterface(IWICBitmapFrameEncode *iface, REFIID iid,
 908     void **ppv)
 909 {
 910     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
 911     TRACE("(%p,%s,%p)\n", iface, debugstr_guid(iid), ppv);
 912
 913     if (!ppv) return E_INVALIDARG;
 914
 915     if (IsEqualIID(&IID_IUnknown, iid) ||
 916         IsEqualIID(&IID_IWICBitmapFrameEncode, iid))
 917     {
 918         *ppv = &This->IWICBitmapFrameEncode_iface;
 919     }
 920     else
 921     {
 922         *ppv = NULL;
 923         return E_NOINTERFACE;
 924     }
 925
 926     IUnknown_AddRef((IUnknown*)*ppv);
 927     return S_OK;
 928 }
 929
 930 static ULONG WINAPI PngFrameEncode_AddRef(IWICBitmapFrameEncode *iface)
 931 {
 932     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
 933     return IUnknown_AddRef((IUnknown*)This);
 934 }
 935
 936 static ULONG WINAPI PngFrameEncode_Release(IWICBitmapFrameEncode *iface)
 937 {
 938     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
 939     return IUnknown_Release((IUnknown*)This);
 940 }
 941
 942 static HRESULT WINAPI PngFrameEncode_Initialize(IWICBitmapFrameEncode *iface,
 943     IPropertyBag2 *pIEncoderOptions)
 944 {
 945     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
 946     TRACE("(%p,%p)\n", iface, pIEncoderOptions);
 947
 948     EnterCriticalSection(&This->lock);
 949
 950     if (This->frame_initialized)
 951     {
 952         LeaveCriticalSection(&This->lock);
 953         return WINCODEC_ERR_WRONGSTATE;
 954     }
 955
 956     This->frame_initialized = TRUE;
 957
 958     LeaveCriticalSection(&This->lock);
 959
 960     return S_OK;
 961 }
 962
 963 static HRESULT WINAPI PngFrameEncode_SetSize(IWICBitmapFrameEncode *iface,
 964     UINT uiWidth, UINT uiHeight)
 965 {
 966     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
 967     TRACE("(%p,%u,%u)\n", iface, uiWidth, uiHeight);
 968
 969     EnterCriticalSection(&This->lock);
 970
 971     if (!This->frame_initialized || This->info_written)
 972     {
 973         LeaveCriticalSection(&This->lock);
 974         return WINCODEC_ERR_WRONGSTATE;
 975     }
 976
 977     This->width = uiWidth;
 978     This->height = uiHeight;
 979
 980     LeaveCriticalSection(&This->lock);
 981
 982     return S_OK;
 983 }
 984
 985 static HRESULT WINAPI PngFrameEncode_SetResolution(IWICBitmapFrameEncode *iface,
 986     double dpiX, double dpiY)
 987 {
 988     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
 989     TRACE("(%p,%0.2f,%0.2f)\n", iface, dpiX, dpiY);
 990
 991     EnterCriticalSection(&This->lock);
 992
 993     if (!This->frame_initialized || This->info_written)
 994     {
 995         LeaveCriticalSection(&This->lock);
 996         return WINCODEC_ERR_WRONGSTATE;
 997     }
 998
 999     This->xres = dpiX;
1000     This->yres = dpiY;
1001
1002     LeaveCriticalSection(&This->lock);
1003
1004     return S_OK;
1005 }
1006
1007 static HRESULT WINAPI PngFrameEncode_SetPixelFormat(IWICBitmapFrameEncode *iface,
1008     WICPixelFormatGUID *pPixelFormat)
1009 {
1010     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
1011     int i;
1012     TRACE("(%p,%s)\n", iface, debugstr_guid(pPixelFormat));
1013
1014     EnterCriticalSection(&This->lock);
1015
1016     if (!This->frame_initialized || This->info_written)
1017     {
1018         LeaveCriticalSection(&This->lock);
1019         return WINCODEC_ERR_WRONGSTATE;
1020     }
1021
1022     for (i=0; formats[i].guid; i++)
1023     {
1024         if (memcmp(formats[i].guid, pPixelFormat, sizeof(GUID)) == 0)
1025             break;
1026     }
1027
1028     if (!formats[i].guid) i = 0;
1029
1030     This->format = &formats[i];
1031     memcpy(pPixelFormat, This->format->guid, sizeof(GUID));
1032
1033     LeaveCriticalSection(&This->lock);
1034
1035     return S_OK;
1036 }
1037
1038 static HRESULT WINAPI PngFrameEncode_SetColorContexts(IWICBitmapFrameEncode *iface,
1039     UINT cCount, IWICColorContext **ppIColorContext)
1040 {
1041     FIXME("(%p,%u,%p): stub\n", iface, cCount, ppIColorContext);
1042     return E_NOTIMPL;
1043 }
1044
1045 static HRESULT WINAPI PngFrameEncode_SetPalette(IWICBitmapFrameEncode *iface,
1046     IWICPalette *pIPalette)
1047 {
1048     FIXME("(%p,%p): stub\n", iface, pIPalette);
1049     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
1050 }
1051
1052 static HRESULT WINAPI PngFrameEncode_SetThumbnail(IWICBitmapFrameEncode *iface,
1053     IWICBitmapSource *pIThumbnail)
1054 {
1055     FIXME("(%p,%p): stub\n", iface, pIThumbnail);
1056     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
1057 }
1058
1059 static HRESULT WINAPI PngFrameEncode_WritePixels(IWICBitmapFrameEncode *iface,
1060     UINT lineCount, UINT cbStride, UINT cbBufferSize, BYTE *pbPixels)
1061 {
1062     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
1063     png_byte **row_pointers=NULL;
1064     UINT i;
1065     jmp_buf jmpbuf;
1066     TRACE("(%p,%u,%u,%u,%p)\n", iface, lineCount, cbStride, cbBufferSize, pbPixels);
1067
1068     EnterCriticalSection(&This->lock);
1069
1070     if (!This->frame_initialized || !This->width || !This->height || !This->format)
1071     {
1072         LeaveCriticalSection(&This->lock);
1073         return WINCODEC_ERR_WRONGSTATE;
1074     }
1075
1076     if (lineCount == 0 || lineCount + This->lines_written > This->height)
1077     {
1078         LeaveCriticalSection(&This->lock);
1079         return E_INVALIDARG;
1080     }
1081
1082     /* set up setjmp/longjmp error handling */
1083     if (setjmp(jmpbuf))
1084     {
1085         LeaveCriticalSection(&This->lock);
1086         HeapFree(GetProcessHeap(), 0, row_pointers);
1087         return E_FAIL;
1088     }
1089     ppng_set_error_fn(This->png_ptr, jmpbuf, user_error_fn, user_warning_fn);
1090
1091     if (!This->info_written)
1092     {
1093         ppng_set_IHDR(This->png_ptr, This->info_ptr, This->width, This->height,
1094             This->format->bit_depth, This->format->color_type, PNG_INTERLACE_NONE,
1095             PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
1096
1097         if (This->xres != 0.0 && This->yres != 0.0)
1098         {
1099             ppng_set_pHYs(This->png_ptr, This->info_ptr, (This->xres+0.0127) / 0.0254,
1100                 (This->yres+0.0127) / 0.0254, PNG_RESOLUTION_METER);
1101         }
1102
1103         ppng_write_info(This->png_ptr, This->info_ptr);
1104
1105         if (This->format->remove_filler)
1106             ppng_set_filler(This->png_ptr, 0, PNG_FILLER_AFTER);
1107
1108         if (This->format->swap_rgb)
1109             ppng_set_bgr(This->png_ptr);
1110
1111         This->info_written = TRUE;
1112     }
1113
1114     row_pointers = HeapAlloc(GetProcessHeap(), 0, lineCount * sizeof(png_byte*));
1115     if (!row_pointers)
1116     {
1117         LeaveCriticalSection(&This->lock);
1118         return E_OUTOFMEMORY;
1119     }
1120
1121     for (i=0; i<lineCount; i++)
1122         row_pointers[i] = pbPixels + cbStride * i;
1123
1124     ppng_write_rows(This->png_ptr, row_pointers, lineCount);
1125     This->lines_written += lineCount;
1126
1127     LeaveCriticalSection(&This->lock);
1128
1129     HeapFree(GetProcessHeap(), 0, row_pointers);
1130
1131     return S_OK;
1132 }
1133
1134 static HRESULT WINAPI PngFrameEncode_WriteSource(IWICBitmapFrameEncode *iface,
1135     IWICBitmapSource *pIBitmapSource, WICRect *prc)
1136 {
1137     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
1138     HRESULT hr;
1139     WICRect rc;
1140     WICPixelFormatGUID guid;
1141     UINT stride;
1142     BYTE *pixeldata;
1143     TRACE("(%p,%p,%p)\n", iface, pIBitmapSource, prc);
1144
1145     if (!This->frame_initialized || !This->width || !This->height)
1146         return WINCODEC_ERR_WRONGSTATE;
1147
1148     if (!This->format)
1149     {
1150         hr = IWICBitmapSource_GetPixelFormat(pIBitmapSource, &guid);
1151         if (FAILED(hr)) return hr;
1152         hr = IWICBitmapFrameEncode_SetPixelFormat(iface, &guid);
1153         if (FAILED(hr)) return hr;
1154     }
1155
1156     hr = IWICBitmapSource_GetPixelFormat(pIBitmapSource, &guid);
1157     if (FAILED(hr)) return hr;
1158     if (memcmp(&guid, This->format->guid, sizeof(GUID)) != 0)
1159     {
1160         /* FIXME: should use WICConvertBitmapSource to convert */
1161         ERR("format %s unsupported\n", debugstr_guid(&guid));
1162         return E_FAIL;
1163     }
1164
1165     if (This->xres == 0.0 || This->yres == 0.0)
1166     {
1167         double xres, yres;
1168         hr = IWICBitmapSource_GetResolution(pIBitmapSource, &xres, &yres);
1169         if (FAILED(hr)) return hr;
1170         hr = IWICBitmapFrameEncode_SetResolution(iface, xres, yres);
1171         if (FAILED(hr)) return hr;
1172     }
1173
1174     if (!prc)
1175     {
1176         UINT width, height;
1177         hr = IWICBitmapSource_GetSize(pIBitmapSource, &width, &height);
1178         if (FAILED(hr)) return hr;
1179         rc.X = 0;
1180         rc.Y = 0;
1181         rc.Width = width;
1182         rc.Height = height;
1183         prc = &rc;
1184     }
1185
1186     if (prc->Width != This->width) return E_INVALIDARG;
1187
1188     stride = (This->format->bpp * This->width + 7)/8;
1189
1190     pixeldata = HeapAlloc(GetProcessHeap(), 0, stride * prc->Height);
1191     if (!pixeldata) return E_OUTOFMEMORY;
1192
1193     hr = IWICBitmapSource_CopyPixels(pIBitmapSource, prc, stride,
1194         stride*prc->Height, pixeldata);
1195
1196     if (SUCCEEDED(hr))
1197     {
1198         hr = IWICBitmapFrameEncode_WritePixels(iface, prc->Height, stride,
1199             stride*prc->Height, pixeldata);
1200     }
1201
1202     HeapFree(GetProcessHeap(), 0, pixeldata);
1203
1204     return hr;
1205 }
1206
1207 static HRESULT WINAPI PngFrameEncode_Commit(IWICBitmapFrameEncode *iface)
1208 {
1209     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
1210     jmp_buf jmpbuf;
1211     TRACE("(%p)\n", iface);
1212
1213     EnterCriticalSection(&This->lock);
1214
1215     if (!This->info_written || This->lines_written != This->height || This->frame_committed)
1216     {
1217         LeaveCriticalSection(&This->lock);
1218         return WINCODEC_ERR_WRONGSTATE;
1219     }
1220
1221     /* set up setjmp/longjmp error handling */
1222     if (setjmp(jmpbuf))
1223     {
1224         LeaveCriticalSection(&This->lock);
1225         return E_FAIL;
1226     }
1227     ppng_set_error_fn(This->png_ptr, jmpbuf, user_error_fn, user_warning_fn);
1228
1229     ppng_write_end(This->png_ptr, This->info_ptr);
1230
1231     This->frame_committed = TRUE;
1232
1233     LeaveCriticalSection(&This->lock);
1234
1235     return S_OK;
1236 }
1237
1238 static HRESULT WINAPI PngFrameEncode_GetMetadataQueryWriter(IWICBitmapFrameEncode *iface,
1239     IWICMetadataQueryWriter **ppIMetadataQueryWriter)
1240 {
1241     FIXME("(%p, %p): stub\n", iface, ppIMetadataQueryWriter);
1242     return E_NOTIMPL;
1243 }
1244
1245 static const IWICBitmapFrameEncodeVtbl PngEncoder_FrameVtbl = {
1246     PngFrameEncode_QueryInterface,
1247     PngFrameEncode_AddRef,
1248     PngFrameEncode_Release,
1249     PngFrameEncode_Initialize,
1250     PngFrameEncode_SetSize,
1251     PngFrameEncode_SetResolution,
1252     PngFrameEncode_SetPixelFormat,
1253     PngFrameEncode_SetColorContexts,
1254     PngFrameEncode_SetPalette,
1255     PngFrameEncode_SetThumbnail,
1256     PngFrameEncode_WritePixels,
1257     PngFrameEncode_WriteSource,
1258     PngFrameEncode_Commit,
1259     PngFrameEncode_GetMetadataQueryWriter
1260 };
1261
1262 static HRESULT WINAPI PngEncoder_QueryInterface(IWICBitmapEncoder *iface, REFIID iid,
1263     void **ppv)
1264 {
1265     PngEncoder *This = impl_from_IWICBitmapEncoder(iface);
1266     TRACE("(%p,%s,%p)\n", iface, debugstr_guid(iid), ppv);
1267
1268     if (!ppv) return E_INVALIDARG;
1269
1270     if (IsEqualIID(&IID_IUnknown, iid) ||
1271         IsEqualIID(&IID_IWICBitmapEncoder, iid))
1272     {
1273         *ppv = This;
1274     }
1275     else
1276     {
1277         *ppv = NULL;
1278         return E_NOINTERFACE;
1279     }
1280
1281     IUnknown_AddRef((IUnknown*)*ppv);
1282     return S_OK;
1283 }
1284
1285 static ULONG WINAPI PngEncoder_AddRef(IWICBitmapEncoder *iface)
1286 {
1287     PngEncoder *This = impl_from_IWICBitmapEncoder(iface);
1288     ULONG ref = InterlockedIncrement(&This->ref);
1289
1290     TRACE("(%p) refcount=%u\n", iface, ref);
1291
1292     return ref;
1293 }
1294
1295 static ULONG WINAPI PngEncoder_Release(IWICBitmapEncoder *iface)
1296 {
1297     PngEncoder *This = impl_from_IWICBitmapEncoder(iface);
1298     ULONG ref = InterlockedDecrement(&This->ref);
1299
1300     TRACE("(%p) refcount=%u\n", iface, ref);
1301
1302     if (ref == 0)
1303     {
1304         This->lock.DebugInfo->Spare[0] = 0;
1305         DeleteCriticalSection(&This->lock);
1306         if (This->png_ptr)
1307             ppng_destroy_write_struct(&This->png_ptr, &This->info_ptr);
1308         if (This->stream)
1309             IStream_Release(This->stream);
1310         HeapFree(GetProcessHeap(), 0, This);
1311     }
1312
1313     return ref;
1314 }
1315
1316 static void user_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
1317 {
1318     PngEncoder *This = ppng_get_io_ptr(png_ptr);
1319     HRESULT hr;
1320     ULONG byteswritten;
1321
1322     hr = IStream_Write(This->stream, data, length, &byteswritten);
1323     if (FAILED(hr) || byteswritten != length)
1324     {
1325         ppng_error(png_ptr, "failed writing data");
1326     }
1327 }
1328
1329 static void user_flush(png_structp png_ptr)
1330 {
1331 }
1332
1333 static HRESULT WINAPI PngEncoder_Initialize(IWICBitmapEncoder *iface,
1334     IStream *pIStream, WICBitmapEncoderCacheOption cacheOption)
1335 {
1336     PngEncoder *This = impl_from_IWICBitmapEncoder(iface);
1337     jmp_buf jmpbuf;
1338
1339     TRACE("(%p,%p,%u)\n", iface, pIStream, cacheOption);
1340
1341     EnterCriticalSection(&This->lock);
1342
1343     if (This->png_ptr)
1344     {
1345         LeaveCriticalSection(&This->lock);
1346         return WINCODEC_ERR_WRONGSTATE;
1347     }
1348
1349     /* initialize libpng */
1350     This->png_ptr = ppng_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
1351     if (!This->png_ptr)
1352     {
1353         LeaveCriticalSection(&This->lock);
1354         return E_FAIL;
1355     }
1356
1357     This->info_ptr = ppng_create_info_struct(This->png_ptr);
1358     if (!This->info_ptr)
1359     {
1360         ppng_destroy_write_struct(&This->png_ptr, NULL);
1361         This->png_ptr = NULL;
1362         LeaveCriticalSection(&This->lock);
1363         return E_FAIL;
1364     }
1365
1366     IStream_AddRef(pIStream);
1367     This->stream = pIStream;
1368
1369     /* set up setjmp/longjmp error handling */
1370     if (setjmp(jmpbuf))
1371     {
1372         ppng_destroy_write_struct(&This->png_ptr, &This->info_ptr);
1373         This->png_ptr = NULL;
1374         IStream_Release(This->stream);
1375         This->stream = NULL;
1376         LeaveCriticalSection(&This->lock);
1377         return E_FAIL;
1378     }
1379     ppng_set_error_fn(This->png_ptr, jmpbuf, user_error_fn, user_warning_fn);
1380
1381     /* set up custom i/o handling */
1382     ppng_set_write_fn(This->png_ptr, This, user_write_data, user_flush);
1383
1384     LeaveCriticalSection(&This->lock);
1385
1386     return S_OK;
1387 }
1388
1389 static HRESULT WINAPI PngEncoder_GetContainerFormat(IWICBitmapEncoder *iface,
1390     GUID *pguidContainerFormat)
1391 {
1392     FIXME("(%p,%s): stub\n", iface, debugstr_guid(pguidContainerFormat));
1393     return E_NOTIMPL;
1394 }
1395
1396 static HRESULT WINAPI PngEncoder_GetEncoderInfo(IWICBitmapEncoder *iface,
1397     IWICBitmapEncoderInfo **ppIEncoderInfo)
1398 {
1399     FIXME("(%p,%p): stub\n", iface, ppIEncoderInfo);
1400     return E_NOTIMPL;
1401 }
1402
1403 static HRESULT WINAPI PngEncoder_SetColorContexts(IWICBitmapEncoder *iface,
1404     UINT cCount, IWICColorContext **ppIColorContext)
1405 {
1406     FIXME("(%p,%u,%p): stub\n", iface, cCount, ppIColorContext);
1407     return E_NOTIMPL;
1408 }
1409
1410 static HRESULT WINAPI PngEncoder_SetPalette(IWICBitmapEncoder *iface, IWICPalette *pIPalette)
1411 {
1412     TRACE("(%p,%p)\n", iface, pIPalette);
1413     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
1414 }
1415
1416 static HRESULT WINAPI PngEncoder_SetThumbnail(IWICBitmapEncoder *iface, IWICBitmapSource *pIThumbnail)
1417 {
1418     TRACE("(%p,%p)\n", iface, pIThumbnail);
1419     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
1420 }
1421
1422 static HRESULT WINAPI PngEncoder_SetPreview(IWICBitmapEncoder *iface, IWICBitmapSource *pIPreview)
1423 {
1424     TRACE("(%p,%p)\n", iface, pIPreview);
1425     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
1426 }
1427
1428 static HRESULT WINAPI PngEncoder_CreateNewFrame(IWICBitmapEncoder *iface,
1429     IWICBitmapFrameEncode **ppIFrameEncode, IPropertyBag2 **ppIEncoderOptions)
1430 {
1431     PngEncoder *This = impl_from_IWICBitmapEncoder(iface);
1432     HRESULT hr;
1433     TRACE("(%p,%p,%p)\n", iface, ppIFrameEncode, ppIEncoderOptions);
1434
1435     EnterCriticalSection(&This->lock);
1436
1437     if (This->frame_count != 0)
1438     {
1439         LeaveCriticalSection(&This->lock);
1440         return WINCODEC_ERR_UNSUPPORTEDOPERATION;
1441     }
1442
1443     if (!This->stream)
1444     {
1445         LeaveCriticalSection(&This->lock);
1446         return WINCODEC_ERR_NOTINITIALIZED;
1447     }
1448
1449     hr = CreatePropertyBag2(ppIEncoderOptions);
1450     if (FAILED(hr))
1451     {
1452         LeaveCriticalSection(&This->lock);
1453         return hr;
1454     }
1455
1456     This->frame_count = 1;
1457
1458     LeaveCriticalSection(&This->lock);
1459
1460     IWICBitmapEncoder_AddRef(iface);
1461     *ppIFrameEncode = &This->IWICBitmapFrameEncode_iface;
1462
1463     return S_OK;
1464 }
1465
1466 static HRESULT WINAPI PngEncoder_Commit(IWICBitmapEncoder *iface)
1467 {
1468     PngEncoder *This = impl_from_IWICBitmapEncoder(iface);
1469     TRACE("(%p)\n", iface);
1470
1471     EnterCriticalSection(&This->lock);
1472
1473     if (!This->frame_committed || This->committed)
1474     {
1475         LeaveCriticalSection(&This->lock);
1476         return WINCODEC_ERR_WRONGSTATE;
1477     }
1478
1479     This->committed = TRUE;
1480
1481     LeaveCriticalSection(&This->lock);
1482
1483     return S_OK;
1484 }
1485
1486 static HRESULT WINAPI PngEncoder_GetMetadataQueryWriter(IWICBitmapEncoder *iface,
1487     IWICMetadataQueryWriter **ppIMetadataQueryWriter)
1488 {
1489     FIXME("(%p,%p): stub\n", iface, ppIMetadataQueryWriter);
1490     return E_NOTIMPL;
1491 }
1492
1493 static const IWICBitmapEncoderVtbl PngEncoder_Vtbl = {
1494     PngEncoder_QueryInterface,
1495     PngEncoder_AddRef,
1496     PngEncoder_Release,
1497     PngEncoder_Initialize,
1498     PngEncoder_GetContainerFormat,
1499     PngEncoder_GetEncoderInfo,
1500     PngEncoder_SetColorContexts,
1501     PngEncoder_SetPalette,
1502     PngEncoder_SetThumbnail,
1503     PngEncoder_SetPreview,
1504     PngEncoder_CreateNewFrame,
1505     PngEncoder_Commit,
1506     PngEncoder_GetMetadataQueryWriter
1507 };
1508
1509 HRESULT PngEncoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv)
1510 {
1511     PngEncoder *This;
1512     HRESULT ret;
1513
1514     TRACE("(%p,%s,%p)\n", pUnkOuter, debugstr_guid(iid), ppv);
1515
1516     *ppv = NULL;
1517
1518     if (pUnkOuter) return CLASS_E_NOAGGREGATION;
1519
1520     if (!libpng_handle && !load_libpng())
1521     {
1522         ERR("Failed writing PNG because unable to find %s\n",SONAME_LIBPNG);
1523         return E_FAIL;
1524     }
1525
1526     This = HeapAlloc(GetProcessHeap(), 0, sizeof(PngEncoder));
1527     if (!This) return E_OUTOFMEMORY;
1528
1529     This->IWICBitmapEncoder_iface.lpVtbl = &PngEncoder_Vtbl;
1530     This->IWICBitmapFrameEncode_iface.lpVtbl = &PngEncoder_FrameVtbl;
1531     This->ref = 1;
1532     This->png_ptr = NULL;
1533     This->info_ptr = NULL;
1534     This->stream = NULL;
1535     This->frame_count = 0;
1536     This->frame_initialized = FALSE;
1537     This->format = NULL;
1538     This->info_written = FALSE;
1539     This->width = 0;
1540     This->height = 0;
1541     This->xres = 0.0;
1542     This->yres = 0.0;
1543     This->lines_written = 0;
1544     This->frame_committed = FALSE;
1545     This->committed = FALSE;
1546     InitializeCriticalSection(&This->lock);
1547     This->lock.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": PngEncoder.lock");
1548
1549     ret = IUnknown_QueryInterface((IUnknown*)This, iid, ppv);
1550     IUnknown_Release((IUnknown*)This);
1551
1552     return ret;
1553 }
1554
1555 #else /* !HAVE_PNG_H */
1556
1557 HRESULT PngDecoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv)
1558 {
1559     ERR("Trying to load PNG picture, but PNG support is not compiled in.\n");
1560     return E_FAIL;
1561 }
1562
1563 HRESULT PngEncoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv)
1564 {
1565     ERR("Trying to save PNG picture, but PNG support is not compiled in.\n");
1566     return E_FAIL;
1567 }
1568
1569 #endif