reactos/dll/win32/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 NONAMELESSUNION
  29 #define COBJMACROS
  30
  31 #include "windef.h"
  32 #include "winbase.h"
  33 #include "objbase.h"
  34 #include "wincodec.h"
  35 #include "wincodecsdk.h"
  36
  37 #include "wincodecs_private.h"
  38
  39 #include "wine/debug.h"
  40 #include "wine/library.h"
  41
  42 WINE_DEFAULT_DEBUG_CHANNEL(wincodecs);
  43
  44 static HRESULT read_png_chunk(IStream *stream, BYTE *type, BYTE **data, ULONG *data_size)
  45 {
  46     BYTE header[8];
  47     HRESULT hr;
  48     ULONG bytesread;
  49
  50     hr = IStream_Read(stream, header, 8, &bytesread);
  51     if (FAILED(hr) || bytesread < 8)
  52     {
  53         if (SUCCEEDED(hr))
  54             hr = E_FAIL;
  55         return hr;
  56     }
  57
  58     *data_size = header[0] << 24 | header[1] << 16 | header[2] << 8 | header[3];
  59
  60     memcpy(type, &header[4], 4);
  61
  62     if (data)
  63     {
  64         *data = HeapAlloc(GetProcessHeap(), 0, *data_size);
  65         if (!*data)
  66             return E_OUTOFMEMORY;
  67
  68         hr = IStream_Read(stream, *data, *data_size, &bytesread);
  69
  70         if (FAILED(hr) || bytesread < *data_size)
  71         {
  72             if (SUCCEEDED(hr))
  73                 hr = E_FAIL;
  74             HeapFree(GetProcessHeap(), 0, *data);
  75             *data = NULL;
  76             return hr;
  77         }
  78
  79         /* FIXME: Verify the CRC? */
  80     }
  81
  82     return S_OK;
  83 }
  84
  85 static HRESULT LoadTextMetadata(IStream *stream, const GUID *preferred_vendor,
  86     DWORD persist_options, MetadataItem **items, DWORD *item_count)
  87 {
  88     HRESULT hr;
  89     BYTE type[4];
  90     BYTE *data;
  91     ULONG data_size;
  92     ULONG name_len, value_len;
  93     BYTE *name_end_ptr;
  94     LPSTR name, value;
  95     MetadataItem *result;
  96
  97     hr = read_png_chunk(stream, type, &data, &data_size);
  98     if (FAILED(hr)) return hr;
  99
 100     name_end_ptr = memchr(data, 0, data_size);
 101
 102     name_len = name_end_ptr - data;
 103
 104     if (!name_end_ptr || name_len > 79)
 105     {
 106         HeapFree(GetProcessHeap(), 0, data);
 107         return E_FAIL;
 108     }
 109
 110     value_len = data_size - name_len - 1;
 111
 112     result = HeapAlloc(GetProcessHeap(), 0, sizeof(MetadataItem));
 113     name = HeapAlloc(GetProcessHeap(), 0, name_len + 1);
 114     value = HeapAlloc(GetProcessHeap(), 0, value_len + 1);
 115     if (!result || !name || !value)
 116     {
 117         HeapFree(GetProcessHeap(), 0, data);
 118         HeapFree(GetProcessHeap(), 0, result);
 119         HeapFree(GetProcessHeap(), 0, name);
 120         HeapFree(GetProcessHeap(), 0, value);
 121         return E_OUTOFMEMORY;
 122     }
 123
 124     PropVariantInit(&result[0].schema);
 125     PropVariantInit(&result[0].id);
 126     PropVariantInit(&result[0].value);
 127
 128     memcpy(name, data, name_len + 1);
 129     memcpy(value, name_end_ptr + 1, value_len);
 130     value[value_len] = 0;
 131
 132     result[0].id.vt = VT_LPSTR;
 133     result[0].id.u.pszVal = name;
 134     result[0].value.vt = VT_LPSTR;
 135     result[0].value.u.pszVal = value;
 136
 137     *items = result;
 138     *item_count = 1;
 139
 140     HeapFree(GetProcessHeap(), 0, data);
 141
 142     return S_OK;
 143 }
 144
 145 static const MetadataHandlerVtbl TextReader_Vtbl = {
 146     0,
 147     &CLSID_WICPngTextMetadataReader,
 148     LoadTextMetadata
 149 };
 150
 151 HRESULT PngTextReader_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv)
 152 {
 153     return MetadataReader_Create(&TextReader_Vtbl, pUnkOuter, iid, ppv);
 154 }
 155
 156 #ifdef SONAME_LIBPNG
 157
 158 static void *libpng_handle;
 159 #define MAKE_FUNCPTR(f) static typeof(f) * p##f
 160 MAKE_FUNCPTR(png_create_read_struct);
 161 MAKE_FUNCPTR(png_create_info_struct);
 162 MAKE_FUNCPTR(png_create_write_struct);
 163 MAKE_FUNCPTR(png_destroy_read_struct);
 164 MAKE_FUNCPTR(png_destroy_write_struct);
 165 MAKE_FUNCPTR(png_error);
 166 MAKE_FUNCPTR(png_get_bit_depth);
 167 MAKE_FUNCPTR(png_get_color_type);
 168 MAKE_FUNCPTR(png_get_error_ptr);
 169 MAKE_FUNCPTR(png_get_iCCP);
 170 MAKE_FUNCPTR(png_get_image_height);
 171 MAKE_FUNCPTR(png_get_image_width);
 172 MAKE_FUNCPTR(png_get_io_ptr);
 173 MAKE_FUNCPTR(png_get_pHYs);
 174 MAKE_FUNCPTR(png_get_PLTE);
 175 MAKE_FUNCPTR(png_get_tRNS);
 176 MAKE_FUNCPTR(png_set_bgr);
 177 MAKE_FUNCPTR(png_set_error_fn);
 178 #if HAVE_PNG_SET_EXPAND_GRAY_1_2_4_TO_8
 179 MAKE_FUNCPTR(png_set_expand_gray_1_2_4_to_8);
 180 #else
 181 MAKE_FUNCPTR(png_set_gray_1_2_4_to_8);
 182 #endif
 183 MAKE_FUNCPTR(png_set_filler);
 184 MAKE_FUNCPTR(png_set_gray_to_rgb);
 185 MAKE_FUNCPTR(png_set_IHDR);
 186 MAKE_FUNCPTR(png_set_pHYs);
 187 MAKE_FUNCPTR(png_set_read_fn);
 188 MAKE_FUNCPTR(png_set_strip_16);
 189 MAKE_FUNCPTR(png_set_tRNS_to_alpha);
 190 MAKE_FUNCPTR(png_set_write_fn);
 191 MAKE_FUNCPTR(png_read_end);
 192 MAKE_FUNCPTR(png_read_image);
 193 MAKE_FUNCPTR(png_read_info);
 194 MAKE_FUNCPTR(png_write_end);
 195 MAKE_FUNCPTR(png_write_info);
 196 MAKE_FUNCPTR(png_write_rows);
 197 #undef MAKE_FUNCPTR
 198
 199 static void *load_libpng(void)
 200 {
 201     if((libpng_handle = wine_dlopen(SONAME_LIBPNG, RTLD_NOW, NULL, 0)) != NULL) {
 202
 203 #define LOAD_FUNCPTR(f) \
 204     if((p##f = wine_dlsym(libpng_handle, #f, NULL, 0)) == NULL) { \
 205         libpng_handle = NULL; \
 206         return NULL; \
 207     }
 208         LOAD_FUNCPTR(png_create_read_struct);
 209         LOAD_FUNCPTR(png_create_info_struct);
 210         LOAD_FUNCPTR(png_create_write_struct);
 211         LOAD_FUNCPTR(png_destroy_read_struct);
 212         LOAD_FUNCPTR(png_destroy_write_struct);
 213         LOAD_FUNCPTR(png_error);
 214         LOAD_FUNCPTR(png_get_bit_depth);
 215         LOAD_FUNCPTR(png_get_color_type);
 216         LOAD_FUNCPTR(png_get_error_ptr);
 217         LOAD_FUNCPTR(png_get_iCCP);
 218         LOAD_FUNCPTR(png_get_image_height);
 219         LOAD_FUNCPTR(png_get_image_width);
 220         LOAD_FUNCPTR(png_get_io_ptr);
 221         LOAD_FUNCPTR(png_get_pHYs);
 222         LOAD_FUNCPTR(png_get_PLTE);
 223         LOAD_FUNCPTR(png_get_tRNS);
 224         LOAD_FUNCPTR(png_set_bgr);
 225         LOAD_FUNCPTR(png_set_error_fn);
 226 #if HAVE_PNG_SET_EXPAND_GRAY_1_2_4_TO_8
 227         LOAD_FUNCPTR(png_set_expand_gray_1_2_4_to_8);
 228 #else
 229         LOAD_FUNCPTR(png_set_gray_1_2_4_to_8);
 230 #endif
 231         LOAD_FUNCPTR(png_set_filler);
 232         LOAD_FUNCPTR(png_set_gray_to_rgb);
 233         LOAD_FUNCPTR(png_set_IHDR);
 234         LOAD_FUNCPTR(png_set_pHYs);
 235         LOAD_FUNCPTR(png_set_read_fn);
 236         LOAD_FUNCPTR(png_set_strip_16);
 237         LOAD_FUNCPTR(png_set_tRNS_to_alpha);
 238         LOAD_FUNCPTR(png_set_write_fn);
 239         LOAD_FUNCPTR(png_read_end);
 240         LOAD_FUNCPTR(png_read_image);
 241         LOAD_FUNCPTR(png_read_info);
 242         LOAD_FUNCPTR(png_write_end);
 243         LOAD_FUNCPTR(png_write_info);
 244         LOAD_FUNCPTR(png_write_rows);
 245
 246 #undef LOAD_FUNCPTR
 247     }
 248     return libpng_handle;
 249 }
 250
 251 static void user_error_fn(png_structp png_ptr, png_const_charp error_message)
 252 {
 253     jmp_buf *pjmpbuf;
 254
 255     /* This uses setjmp/longjmp just like the default. We can't use the
 256      * default because there's no way to access the jmp buffer in the png_struct
 257      * that works in 1.2 and 1.4 and allows us to dynamically load libpng. */
 258     WARN("PNG error: %s\n", debugstr_a(error_message));
 259     pjmpbuf = ppng_get_error_ptr(png_ptr);
 260     longjmp(*pjmpbuf, 1);
 261 }
 262
 263 static void user_warning_fn(png_structp png_ptr, png_const_charp warning_message)
 264 {
 265     WARN("PNG warning: %s\n", debugstr_a(warning_message));
 266 }
 267
 268 typedef struct {
 269     IWICBitmapDecoder IWICBitmapDecoder_iface;
 270     IWICBitmapFrameDecode IWICBitmapFrameDecode_iface;
 271     IWICMetadataBlockReader IWICMetadataBlockReader_iface;
 272     LONG ref;
 273     png_structp png_ptr;
 274     png_infop info_ptr;
 275     png_infop end_info;
 276     BOOL initialized;
 277     int bpp;
 278     int width, height;
 279     UINT stride;
 280     const WICPixelFormatGUID *format;
 281     BYTE *image_bits;
 282     CRITICAL_SECTION lock; /* must be held when png structures are accessed or initialized is set */
 283 } PngDecoder;
 284
 285 static inline PngDecoder *impl_from_IWICBitmapDecoder(IWICBitmapDecoder *iface)
 286 {
 287     return CONTAINING_RECORD(iface, PngDecoder, IWICBitmapDecoder_iface);
 288 }
 289
 290 static inline PngDecoder *impl_from_IWICBitmapFrameDecode(IWICBitmapFrameDecode *iface)
 291 {
 292     return CONTAINING_RECORD(iface, PngDecoder, IWICBitmapFrameDecode_iface);
 293 }
 294
 295 static inline PngDecoder *impl_from_IWICMetadataBlockReader(IWICMetadataBlockReader *iface)
 296 {
 297     return CONTAINING_RECORD(iface, PngDecoder, IWICMetadataBlockReader_iface);
 298 }
 299
 300 static const IWICBitmapFrameDecodeVtbl PngDecoder_FrameVtbl;
 301
 302 static HRESULT WINAPI PngDecoder_QueryInterface(IWICBitmapDecoder *iface, REFIID iid,
 303     void **ppv)
 304 {
 305     PngDecoder *This = impl_from_IWICBitmapDecoder(iface);
 306     TRACE("(%p,%s,%p)\n", iface, debugstr_guid(iid), ppv);
 307
 308     if (!ppv) return E_INVALIDARG;
 309
 310     if (IsEqualIID(&IID_IUnknown, iid) || IsEqualIID(&IID_IWICBitmapDecoder, iid))
 311     {
 312         *ppv = &This->IWICBitmapDecoder_iface;
 313     }
 314     else
 315     {
 316         *ppv = NULL;
 317         return E_NOINTERFACE;
 318     }
 319
 320     IUnknown_AddRef((IUnknown*)*ppv);
 321     return S_OK;
 322 }
 323
 324 static ULONG WINAPI PngDecoder_AddRef(IWICBitmapDecoder *iface)
 325 {
 326     PngDecoder *This = impl_from_IWICBitmapDecoder(iface);
 327     ULONG ref = InterlockedIncrement(&This->ref);
 328
 329     TRACE("(%p) refcount=%u\n", iface, ref);
 330
 331     return ref;
 332 }
 333
 334 static ULONG WINAPI PngDecoder_Release(IWICBitmapDecoder *iface)
 335 {
 336     PngDecoder *This = impl_from_IWICBitmapDecoder(iface);
 337     ULONG ref = InterlockedDecrement(&This->ref);
 338
 339     TRACE("(%p) refcount=%u\n", iface, ref);
 340
 341     if (ref == 0)
 342     {
 343         if (This->png_ptr)
 344             ppng_destroy_read_struct(&This->png_ptr, &This->info_ptr, &This->end_info);
 345         This->lock.DebugInfo->Spare[0] = 0;
 346         DeleteCriticalSection(&This->lock);
 347         HeapFree(GetProcessHeap(), 0, This->image_bits);
 348         HeapFree(GetProcessHeap(), 0, This);
 349     }
 350
 351     return ref;
 352 }
 353
 354 static HRESULT WINAPI PngDecoder_QueryCapability(IWICBitmapDecoder *iface, IStream *stream,
 355     DWORD *capability)
 356 {
 357     HRESULT hr;
 358
 359     TRACE("(%p,%p,%p)\n", iface, stream, capability);
 360
 361     if (!stream || !capability) return E_INVALIDARG;
 362
 363     hr = IWICBitmapDecoder_Initialize(iface, stream, WICDecodeMetadataCacheOnDemand);
 364     if (hr != S_OK) return hr;
 365
 366     *capability = WICBitmapDecoderCapabilityCanDecodeAllImages |
 367                   WICBitmapDecoderCapabilityCanDecodeSomeImages;
 368     /* FIXME: WICBitmapDecoderCapabilityCanEnumerateMetadata */
 369     return S_OK;
 370 }
 371
 372 static void user_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 373 {
 374     IStream *stream = ppng_get_io_ptr(png_ptr);
 375     HRESULT hr;
 376     ULONG bytesread;
 377
 378     hr = IStream_Read(stream, data, length, &bytesread);
 379     if (FAILED(hr) || bytesread != length)
 380     {
 381         ppng_error(png_ptr, "failed reading data");
 382     }
 383 }
 384
 385 static HRESULT WINAPI PngDecoder_Initialize(IWICBitmapDecoder *iface, IStream *pIStream,
 386     WICDecodeOptions cacheOptions)
 387 {
 388     PngDecoder *This = impl_from_IWICBitmapDecoder(iface);
 389     LARGE_INTEGER seek;
 390     HRESULT hr=S_OK;
 391     png_bytep *row_pointers=NULL;
 392     UINT image_size;
 393     UINT i;
 394     int color_type, bit_depth;
 395     png_bytep trans;
 396     int num_trans;
 397     png_uint_32 transparency;
 398     png_color_16p trans_values;
 399     jmp_buf jmpbuf;
 400
 401     TRACE("(%p,%p,%x)\n", iface, pIStream, cacheOptions);
 402
 403     EnterCriticalSection(&This->lock);
 404
 405     /* initialize libpng */
 406     This->png_ptr = ppng_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
 407     if (!This->png_ptr)
 408     {
 409         hr = E_FAIL;
 410         goto end;
 411     }
 412
 413     This->info_ptr = ppng_create_info_struct(This->png_ptr);
 414     if (!This->info_ptr)
 415     {
 416         ppng_destroy_read_struct(&This->png_ptr, NULL, NULL);
 417         This->png_ptr = NULL;
 418         hr = E_FAIL;
 419         goto end;
 420     }
 421
 422     This->end_info = ppng_create_info_struct(This->png_ptr);
 423     if (!This->info_ptr)
 424     {
 425         ppng_destroy_read_struct(&This->png_ptr, &This->info_ptr, NULL);
 426         This->png_ptr = NULL;
 427         hr = E_FAIL;
 428         goto end;
 429     }
 430
 431     /* set up setjmp/longjmp error handling */
 432     if (setjmp(jmpbuf))
 433     {
 434         ppng_destroy_read_struct(&This->png_ptr, &This->info_ptr, &This->end_info);
 435         HeapFree(GetProcessHeap(), 0, row_pointers);
 436         This->png_ptr = NULL;
 437         hr = E_FAIL;
 438         goto end;
 439     }
 440     ppng_set_error_fn(This->png_ptr, jmpbuf, user_error_fn, user_warning_fn);
 441
 442     /* seek to the start of the stream */
 443     seek.QuadPart = 0;
 444     hr = IStream_Seek(pIStream, seek, STREAM_SEEK_SET, NULL);
 445     if (FAILED(hr)) goto end;
 446
 447     /* set up custom i/o handling */
 448     ppng_set_read_fn(This->png_ptr, pIStream, user_read_data);
 449
 450     /* read the header */
 451     ppng_read_info(This->png_ptr, This->info_ptr);
 452
 453     /* choose a pixel format */
 454     color_type = ppng_get_color_type(This->png_ptr, This->info_ptr);
 455     bit_depth = ppng_get_bit_depth(This->png_ptr, This->info_ptr);
 456
 457     /* check for color-keyed alpha */
 458     transparency = ppng_get_tRNS(This->png_ptr, This->info_ptr, &trans, &num_trans, &trans_values);
 459
 460     if (transparency && color_type != PNG_COLOR_TYPE_PALETTE)
 461     {
 462         /* expand to RGBA */
 463         if (color_type == PNG_COLOR_TYPE_GRAY)
 464         {
 465             if (bit_depth < 8)
 466             {
 467 #if HAVE_PNG_SET_EXPAND_GRAY_1_2_4_TO_8
 468                 ppng_set_expand_gray_1_2_4_to_8(This->png_ptr);
 469 #else
 470                 ppng_set_gray_1_2_4_to_8(This->png_ptr);
 471 #endif
 472                 bit_depth = 8;
 473             }
 474             ppng_set_gray_to_rgb(This->png_ptr);
 475         }
 476         ppng_set_tRNS_to_alpha(This->png_ptr);
 477         color_type = PNG_COLOR_TYPE_RGB_ALPHA;
 478     }
 479
 480     switch (color_type)
 481     {
 482     case PNG_COLOR_TYPE_GRAY:
 483         This->bpp = bit_depth;
 484         switch (bit_depth)
 485         {
 486         case 1: This->format = &GUID_WICPixelFormatBlackWhite; break;
 487         case 2: This->format = &GUID_WICPixelFormat2bppGray; break;
 488         case 4: This->format = &GUID_WICPixelFormat4bppGray; break;
 489         case 8: This->format = &GUID_WICPixelFormat8bppGray; break;
 490         case 16: This->format = &GUID_WICPixelFormat16bppGray; break;
 491         default:
 492             ERR("invalid grayscale bit depth: %i\n", bit_depth);
 493             hr = E_FAIL;
 494             goto end;
 495         }
 496         break;
 497     case PNG_COLOR_TYPE_GRAY_ALPHA:
 498         /* WIC does not support grayscale alpha formats so use RGBA */
 499         ppng_set_gray_to_rgb(This->png_ptr);
 500         /* fall through */
 501     case PNG_COLOR_TYPE_RGB_ALPHA:
 502         This->bpp = bit_depth * 4;
 503         switch (bit_depth)
 504         {
 505         case 8:
 506             ppng_set_bgr(This->png_ptr);
 507             This->format = &GUID_WICPixelFormat32bppBGRA;
 508             break;
 509         case 16: This->format = &GUID_WICPixelFormat64bppRGBA; break;
 510         default:
 511             ERR("invalid RGBA bit depth: %i\n", bit_depth);
 512             hr = E_FAIL;
 513             goto end;
 514         }
 515         break;
 516     case PNG_COLOR_TYPE_PALETTE:
 517         This->bpp = bit_depth;
 518         switch (bit_depth)
 519         {
 520         case 1: This->format = &GUID_WICPixelFormat1bppIndexed; break;
 521         case 2: This->format = &GUID_WICPixelFormat2bppIndexed; break;
 522         case 4: This->format = &GUID_WICPixelFormat4bppIndexed; break;
 523         case 8: This->format = &GUID_WICPixelFormat8bppIndexed; break;
 524         default:
 525             ERR("invalid indexed color bit depth: %i\n", bit_depth);
 526             hr = E_FAIL;
 527             goto end;
 528         }
 529         break;
 530     case PNG_COLOR_TYPE_RGB:
 531         This->bpp = bit_depth * 3;
 532         switch (bit_depth)
 533         {
 534         case 8:
 535             ppng_set_bgr(This->png_ptr);
 536             This->format = &GUID_WICPixelFormat24bppBGR;
 537             break;
 538         case 16: This->format = &GUID_WICPixelFormat48bppRGB; break;
 539         default:
 540             ERR("invalid RGB color bit depth: %i\n", bit_depth);
 541             hr = E_FAIL;
 542             goto end;
 543         }
 544         break;
 545     default:
 546         ERR("invalid color type %i\n", color_type);
 547         hr = E_FAIL;
 548         goto end;
 549     }
 550
 551     /* read the image data */
 552     This->width = ppng_get_image_width(This->png_ptr, This->info_ptr);
 553     This->height = ppng_get_image_height(This->png_ptr, This->info_ptr);
 554     This->stride = This->width * This->bpp;
 555     image_size = This->stride * This->height;
 556
 557     This->image_bits = HeapAlloc(GetProcessHeap(), 0, image_size);
 558     if (!This->image_bits)
 559     {
 560         hr = E_OUTOFMEMORY;
 561         goto end;
 562     }
 563
 564     row_pointers = HeapAlloc(GetProcessHeap(), 0, sizeof(png_bytep)*This->height);
 565     if (!row_pointers)
 566     {
 567         hr = E_OUTOFMEMORY;
 568         goto end;
 569     }
 570
 571     for (i=0; i<This->height; i++)
 572         row_pointers[i] = This->image_bits + i * This->stride;
 573
 574     ppng_read_image(This->png_ptr, row_pointers);
 575
 576     HeapFree(GetProcessHeap(), 0, row_pointers);
 577     row_pointers = NULL;
 578
 579     ppng_read_end(This->png_ptr, This->end_info);
 580
 581     This->initialized = TRUE;
 582
 583 end:
 584
 585     LeaveCriticalSection(&This->lock);
 586
 587     return hr;
 588 }
 589
 590 static HRESULT WINAPI PngDecoder_GetContainerFormat(IWICBitmapDecoder *iface,
 591     GUID *pguidContainerFormat)
 592 {
 593     memcpy(pguidContainerFormat, &GUID_ContainerFormatPng, sizeof(GUID));
 594     return S_OK;
 595 }
 596
 597 static HRESULT WINAPI PngDecoder_GetDecoderInfo(IWICBitmapDecoder *iface,
 598     IWICBitmapDecoderInfo **ppIDecoderInfo)
 599 {
 600     HRESULT hr;
 601     IWICComponentInfo *compinfo;
 602
 603     TRACE("(%p,%p)\n", iface, ppIDecoderInfo);
 604
 605     hr = CreateComponentInfo(&CLSID_WICPngDecoder, &compinfo);
 606     if (FAILED(hr)) return hr;
 607
 608     hr = IWICComponentInfo_QueryInterface(compinfo, &IID_IWICBitmapDecoderInfo,
 609         (void**)ppIDecoderInfo);
 610
 611     IWICComponentInfo_Release(compinfo);
 612
 613     return hr;
 614 }
 615
 616 static HRESULT WINAPI PngDecoder_CopyPalette(IWICBitmapDecoder *iface,
 617     IWICPalette *pIPalette)
 618 {
 619     FIXME("(%p,%p): stub\n", iface, pIPalette);
 620     return E_NOTIMPL;
 621 }
 622
 623 static HRESULT WINAPI PngDecoder_GetMetadataQueryReader(IWICBitmapDecoder *iface,
 624     IWICMetadataQueryReader **ppIMetadataQueryReader)
 625 {
 626     FIXME("(%p,%p): stub\n", iface, ppIMetadataQueryReader);
 627     return E_NOTIMPL;
 628 }
 629
 630 static HRESULT WINAPI PngDecoder_GetPreview(IWICBitmapDecoder *iface,
 631     IWICBitmapSource **ppIBitmapSource)
 632 {
 633     FIXME("(%p,%p): stub\n", iface, ppIBitmapSource);
 634     return E_NOTIMPL;
 635 }
 636
 637 static HRESULT WINAPI PngDecoder_GetColorContexts(IWICBitmapDecoder *iface,
 638     UINT cCount, IWICColorContext **ppIColorContexts, UINT *pcActualCount)
 639 {
 640     TRACE("(%p,%u,%p,%p)\n", iface, cCount, ppIColorContexts, pcActualCount);
 641     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 642 }
 643
 644 static HRESULT WINAPI PngDecoder_GetThumbnail(IWICBitmapDecoder *iface,
 645     IWICBitmapSource **ppIThumbnail)
 646 {
 647     TRACE("(%p,%p)\n", iface, ppIThumbnail);
 648     return WINCODEC_ERR_CODECNOTHUMBNAIL;
 649 }
 650
 651 static HRESULT WINAPI PngDecoder_GetFrameCount(IWICBitmapDecoder *iface,
 652     UINT *pCount)
 653 {
 654     if (!pCount) return E_INVALIDARG;
 655
 656     *pCount = 1;
 657     return S_OK;
 658 }
 659
 660 static HRESULT WINAPI PngDecoder_GetFrame(IWICBitmapDecoder *iface,
 661     UINT index, IWICBitmapFrameDecode **ppIBitmapFrame)
 662 {
 663     PngDecoder *This = impl_from_IWICBitmapDecoder(iface);
 664     TRACE("(%p,%u,%p)\n", iface, index, ppIBitmapFrame);
 665
 666     if (!This->initialized) return WINCODEC_ERR_FRAMEMISSING;
 667
 668     if (index != 0) return E_INVALIDARG;
 669
 670     IWICBitmapDecoder_AddRef(iface);
 671
 672     *ppIBitmapFrame = &This->IWICBitmapFrameDecode_iface;
 673
 674     return S_OK;
 675 }
 676
 677 static const IWICBitmapDecoderVtbl PngDecoder_Vtbl = {
 678     PngDecoder_QueryInterface,
 679     PngDecoder_AddRef,
 680     PngDecoder_Release,
 681     PngDecoder_QueryCapability,
 682     PngDecoder_Initialize,
 683     PngDecoder_GetContainerFormat,
 684     PngDecoder_GetDecoderInfo,
 685     PngDecoder_CopyPalette,
 686     PngDecoder_GetMetadataQueryReader,
 687     PngDecoder_GetPreview,
 688     PngDecoder_GetColorContexts,
 689     PngDecoder_GetThumbnail,
 690     PngDecoder_GetFrameCount,
 691     PngDecoder_GetFrame
 692 };
 693
 694 static HRESULT WINAPI PngDecoder_Frame_QueryInterface(IWICBitmapFrameDecode *iface, REFIID iid,
 695     void **ppv)
 696 {
 697     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 698     if (!ppv) return E_INVALIDARG;
 699
 700     if (IsEqualIID(&IID_IUnknown, iid) ||
 701         IsEqualIID(&IID_IWICBitmapSource, iid) ||
 702         IsEqualIID(&IID_IWICBitmapFrameDecode, iid))
 703     {
 704         *ppv = &This->IWICBitmapFrameDecode_iface;
 705     }
 706     else if (IsEqualIID(&IID_IWICMetadataBlockReader, iid))
 707     {
 708         *ppv = &This->IWICMetadataBlockReader_iface;
 709     }
 710     else
 711     {
 712         *ppv = NULL;
 713         return E_NOINTERFACE;
 714     }
 715
 716     IUnknown_AddRef((IUnknown*)*ppv);
 717     return S_OK;
 718 }
 719
 720 static ULONG WINAPI PngDecoder_Frame_AddRef(IWICBitmapFrameDecode *iface)
 721 {
 722     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 723     return IWICBitmapDecoder_AddRef(&This->IWICBitmapDecoder_iface);
 724 }
 725
 726 static ULONG WINAPI PngDecoder_Frame_Release(IWICBitmapFrameDecode *iface)
 727 {
 728     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 729     return IWICBitmapDecoder_Release(&This->IWICBitmapDecoder_iface);
 730 }
 731
 732 static HRESULT WINAPI PngDecoder_Frame_GetSize(IWICBitmapFrameDecode *iface,
 733     UINT *puiWidth, UINT *puiHeight)
 734 {
 735     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 736     *puiWidth = This->width;
 737     *puiHeight = This->height;
 738     TRACE("(%p)->(%u,%u)\n", iface, *puiWidth, *puiHeight);
 739     return S_OK;
 740 }
 741
 742 static HRESULT WINAPI PngDecoder_Frame_GetPixelFormat(IWICBitmapFrameDecode *iface,
 743     WICPixelFormatGUID *pPixelFormat)
 744 {
 745     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 746     TRACE("(%p,%p)\n", iface, pPixelFormat);
 747
 748     memcpy(pPixelFormat, This->format, sizeof(GUID));
 749
 750     return S_OK;
 751 }
 752
 753 static HRESULT WINAPI PngDecoder_Frame_GetResolution(IWICBitmapFrameDecode *iface,
 754     double *pDpiX, double *pDpiY)
 755 {
 756     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 757     png_uint_32 ret, xres, yres;
 758     int unit_type;
 759
 760     EnterCriticalSection(&This->lock);
 761
 762     ret = ppng_get_pHYs(This->png_ptr, This->info_ptr, &xres, &yres, &unit_type);
 763
 764     if (ret && unit_type == PNG_RESOLUTION_METER)
 765     {
 766         *pDpiX = xres * 0.0254;
 767         *pDpiY = yres * 0.0254;
 768     }
 769     else
 770     {
 771         WARN("no pHYs block present\n");
 772         *pDpiX = *pDpiY = 96.0;
 773     }
 774
 775     LeaveCriticalSection(&This->lock);
 776
 777     TRACE("(%p)->(%0.2f,%0.2f)\n", iface, *pDpiX, *pDpiY);
 778
 779     return S_OK;
 780 }
 781
 782 static HRESULT WINAPI PngDecoder_Frame_CopyPalette(IWICBitmapFrameDecode *iface,
 783     IWICPalette *pIPalette)
 784 {
 785     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 786     png_uint_32 ret;
 787     png_colorp png_palette;
 788     int num_palette;
 789     WICColor palette[256];
 790     png_bytep trans;
 791     int num_trans;
 792     png_color_16p trans_values;
 793     int i;
 794     HRESULT hr=S_OK;
 795
 796     TRACE("(%p,%p)\n", iface, pIPalette);
 797
 798     EnterCriticalSection(&This->lock);
 799
 800     ret = ppng_get_PLTE(This->png_ptr, This->info_ptr, &png_palette, &num_palette);
 801     if (!ret)
 802     {
 803         hr = WINCODEC_ERR_PALETTEUNAVAILABLE;
 804         goto end;
 805     }
 806
 807     if (num_palette > 256)
 808     {
 809         ERR("palette has %i colors?!\n", num_palette);
 810         hr = E_FAIL;
 811         goto end;
 812     }
 813
 814     for (i=0; i<num_palette; i++)
 815     {
 816         palette[i] = (0xff000000|
 817                       png_palette[i].red << 16|
 818                       png_palette[i].green << 8|
 819                       png_palette[i].blue);
 820     }
 821
 822     ret = ppng_get_tRNS(This->png_ptr, This->info_ptr, &trans, &num_trans, &trans_values);
 823     if (ret)
 824     {
 825         for (i=0; i<num_trans; i++)
 826         {
 827             palette[trans[i]] = 0x00000000;
 828         }
 829     }
 830
 831 end:
 832
 833     LeaveCriticalSection(&This->lock);
 834
 835     if (SUCCEEDED(hr))
 836         hr = IWICPalette_InitializeCustom(pIPalette, palette, num_palette);
 837
 838     return hr;
 839 }
 840
 841 static HRESULT WINAPI PngDecoder_Frame_CopyPixels(IWICBitmapFrameDecode *iface,
 842     const WICRect *prc, UINT cbStride, UINT cbBufferSize, BYTE *pbBuffer)
 843 {
 844     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 845     TRACE("(%p,%p,%u,%u,%p)\n", iface, prc, cbStride, cbBufferSize, pbBuffer);
 846
 847     return copy_pixels(This->bpp, This->image_bits,
 848         This->width, This->height, This->stride,
 849         prc, cbStride, cbBufferSize, pbBuffer);
 850 }
 851
 852 static HRESULT WINAPI PngDecoder_Frame_GetMetadataQueryReader(IWICBitmapFrameDecode *iface,
 853     IWICMetadataQueryReader **ppIMetadataQueryReader)
 854 {
 855     FIXME("(%p,%p): stub\n", iface, ppIMetadataQueryReader);
 856     return E_NOTIMPL;
 857 }
 858
 859 static HRESULT WINAPI PngDecoder_Frame_GetColorContexts(IWICBitmapFrameDecode *iface,
 860     UINT cCount, IWICColorContext **ppIColorContexts, UINT *pcActualCount)
 861 {
 862     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 863     png_charp name, profile;
 864     png_uint_32 len;
 865     int compression_type;
 866     HRESULT hr;
 867
 868     TRACE("(%p,%u,%p,%p)\n", iface, cCount, ppIColorContexts, pcActualCount);
 869
 870     if (!pcActualCount) return E_INVALIDARG;
 871
 872     EnterCriticalSection(&This->lock);
 873
 874     if (ppng_get_iCCP(This->png_ptr, This->info_ptr, &name, &compression_type, &profile, &len))
 875     {
 876         if (cCount && ppIColorContexts)
 877         {
 878             hr = IWICColorContext_InitializeFromMemory(*ppIColorContexts, (const BYTE *)profile, len);
 879             if (FAILED(hr))
 880             {
 881                 LeaveCriticalSection(&This->lock);
 882                 return hr;
 883             }
 884         }
 885         *pcActualCount = 1;
 886     }
 887     else
 888         *pcActualCount = 0;
 889
 890     LeaveCriticalSection(&This->lock);
 891
 892     return S_OK;
 893 }
 894
 895 static HRESULT WINAPI PngDecoder_Frame_GetThumbnail(IWICBitmapFrameDecode *iface,
 896     IWICBitmapSource **ppIThumbnail)
 897 {
 898     FIXME("(%p,%p): stub\n", iface, ppIThumbnail);
 899     return E_NOTIMPL;
 900 }
 901
 902 static const IWICBitmapFrameDecodeVtbl PngDecoder_FrameVtbl = {
 903     PngDecoder_Frame_QueryInterface,
 904     PngDecoder_Frame_AddRef,
 905     PngDecoder_Frame_Release,
 906     PngDecoder_Frame_GetSize,
 907     PngDecoder_Frame_GetPixelFormat,
 908     PngDecoder_Frame_GetResolution,
 909     PngDecoder_Frame_CopyPalette,
 910     PngDecoder_Frame_CopyPixels,
 911     PngDecoder_Frame_GetMetadataQueryReader,
 912     PngDecoder_Frame_GetColorContexts,
 913     PngDecoder_Frame_GetThumbnail
 914 };
 915
 916 static HRESULT WINAPI PngDecoder_Block_QueryInterface(IWICMetadataBlockReader *iface, REFIID iid,
 917     void **ppv)
 918 {
 919     PngDecoder *This = impl_from_IWICMetadataBlockReader(iface);
 920     return IWICBitmapFrameDecode_QueryInterface(&This->IWICBitmapFrameDecode_iface, iid, ppv);
 921 }
 922
 923 static ULONG WINAPI PngDecoder_Block_AddRef(IWICMetadataBlockReader *iface)
 924 {
 925     PngDecoder *This = impl_from_IWICMetadataBlockReader(iface);
 926     return IWICBitmapDecoder_AddRef(&This->IWICBitmapDecoder_iface);
 927 }
 928
 929 static ULONG WINAPI PngDecoder_Block_Release(IWICMetadataBlockReader *iface)
 930 {
 931     PngDecoder *This = impl_from_IWICMetadataBlockReader(iface);
 932     return IWICBitmapDecoder_Release(&This->IWICBitmapDecoder_iface);
 933 }
 934
 935 static HRESULT WINAPI PngDecoder_Block_GetContainerFormat(IWICMetadataBlockReader *iface,
 936     GUID *pguidContainerFormat)
 937 {
 938     if (!pguidContainerFormat) return E_INVALIDARG;
 939     memcpy(pguidContainerFormat, &GUID_ContainerFormatPng, sizeof(GUID));
 940     return S_OK;
 941 }
 942
 943 static HRESULT WINAPI PngDecoder_Block_GetCount(IWICMetadataBlockReader *iface,
 944     UINT *pcCount)
 945 {
 946     FIXME("%p,%p: stub\n", iface, pcCount);
 947     return E_NOTIMPL;
 948 }
 949
 950 static HRESULT WINAPI PngDecoder_Block_GetReaderByIndex(IWICMetadataBlockReader *iface,
 951     UINT nIndex, IWICMetadataReader **ppIMetadataReader)
 952 {
 953     FIXME("%p,%d,%p\n", iface, nIndex, ppIMetadataReader);
 954     return E_NOTIMPL;
 955 }
 956
 957 static HRESULT WINAPI PngDecoder_Block_GetEnumerator(IWICMetadataBlockReader *iface,
 958     IEnumUnknown **ppIEnumMetadata)
 959 {
 960     FIXME("%p,%p\n", iface, ppIEnumMetadata);
 961     return E_NOTIMPL;
 962 }
 963
 964 static const IWICMetadataBlockReaderVtbl PngDecoder_BlockVtbl = {
 965     PngDecoder_Block_QueryInterface,
 966     PngDecoder_Block_AddRef,
 967     PngDecoder_Block_Release,
 968     PngDecoder_Block_GetContainerFormat,
 969     PngDecoder_Block_GetCount,
 970     PngDecoder_Block_GetReaderByIndex,
 971     PngDecoder_Block_GetEnumerator,
 972 };
 973
 974 HRESULT PngDecoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv)
 975 {
 976     PngDecoder *This;
 977     HRESULT ret;
 978
 979     TRACE("(%p,%s,%p)\n", pUnkOuter, debugstr_guid(iid), ppv);
 980
 981     *ppv = NULL;
 982
 983     if (pUnkOuter) return CLASS_E_NOAGGREGATION;
 984
 985     if (!libpng_handle && !load_libpng())
 986     {
 987         ERR("Failed reading PNG because unable to find %s\n",SONAME_LIBPNG);
 988         return E_FAIL;
 989     }
 990
 991     This = HeapAlloc(GetProcessHeap(), 0, sizeof(PngDecoder));
 992     if (!This) return E_OUTOFMEMORY;
 993
 994     This->IWICBitmapDecoder_iface.lpVtbl = &PngDecoder_Vtbl;
 995     This->IWICBitmapFrameDecode_iface.lpVtbl = &PngDecoder_FrameVtbl;
 996     This->IWICMetadataBlockReader_iface.lpVtbl = &PngDecoder_BlockVtbl;
 997     This->ref = 1;
 998     This->png_ptr = NULL;
 999     This->info_ptr = NULL;
1000     This->end_info = NULL;
1001     This->initialized = FALSE;
1002     This->image_bits = NULL;
1003     InitializeCriticalSection(&This->lock);
1004     This->lock.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": PngDecoder.lock");
1005
1006     ret = IWICBitmapDecoder_QueryInterface(&This->IWICBitmapDecoder_iface, iid, ppv);
1007     IWICBitmapDecoder_Release(&This->IWICBitmapDecoder_iface);
1008
1009     return ret;
1010 }
1011
1012 struct png_pixelformat {
1013     const WICPixelFormatGUID *guid;
1014     UINT bpp;
1015     int bit_depth;
1016     int color_type;
1017     BOOL remove_filler;
1018     BOOL swap_rgb;
1019 };
1020
1021 static const struct png_pixelformat formats[] = {
1022     {&GUID_WICPixelFormat24bppBGR, 24, 8, PNG_COLOR_TYPE_RGB, 0, 1},
1023     {&GUID_WICPixelFormatBlackWhite, 1, 1, PNG_COLOR_TYPE_GRAY, 0, 0},
1024     {&GUID_WICPixelFormat2bppGray, 2, 2, PNG_COLOR_TYPE_GRAY, 0, 0},
1025     {&GUID_WICPixelFormat4bppGray, 4, 4, PNG_COLOR_TYPE_GRAY, 0, 0},
1026     {&GUID_WICPixelFormat8bppGray, 8, 8, PNG_COLOR_TYPE_GRAY, 0, 0},
1027     {&GUID_WICPixelFormat16bppGray, 16, 16, PNG_COLOR_TYPE_GRAY, 0, 0},
1028     {&GUID_WICPixelFormat32bppBGR, 32, 8, PNG_COLOR_TYPE_RGB, 1, 1},
1029     {&GUID_WICPixelFormat32bppBGRA, 32, 8, PNG_COLOR_TYPE_RGB_ALPHA, 0, 1},
1030     {&GUID_WICPixelFormat48bppRGB, 48, 16, PNG_COLOR_TYPE_RGB, 0, 0},
1031     {&GUID_WICPixelFormat64bppRGBA, 64, 16, PNG_COLOR_TYPE_RGB_ALPHA, 0, 0},
1032     {NULL},
1033 };
1034
1035 typedef struct PngEncoder {
1036     IWICBitmapEncoder IWICBitmapEncoder_iface;
1037     IWICBitmapFrameEncode IWICBitmapFrameEncode_iface;
1038     LONG ref;
1039     IStream *stream;
1040     png_structp png_ptr;
1041     png_infop info_ptr;
1042     UINT frame_count;
1043     BOOL frame_initialized;
1044     const struct png_pixelformat *format;
1045     BOOL info_written;
1046     UINT width, height;
1047     double xres, yres;
1048     UINT lines_written;
1049     BOOL frame_committed;
1050     BOOL committed;
1051     CRITICAL_SECTION lock;
1052 } PngEncoder;
1053
1054 static inline PngEncoder *impl_from_IWICBitmapEncoder(IWICBitmapEncoder *iface)
1055 {
1056     return CONTAINING_RECORD(iface, PngEncoder, IWICBitmapEncoder_iface);
1057 }
1058
1059 static inline PngEncoder *impl_from_IWICBitmapFrameEncode(IWICBitmapFrameEncode *iface)
1060 {
1061     return CONTAINING_RECORD(iface, PngEncoder, IWICBitmapFrameEncode_iface);
1062 }
1063
1064 static HRESULT WINAPI PngFrameEncode_QueryInterface(IWICBitmapFrameEncode *iface, REFIID iid,
1065     void **ppv)
1066 {
1067     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
1068     TRACE("(%p,%s,%p)\n", iface, debugstr_guid(iid), ppv);
1069
1070     if (!ppv) return E_INVALIDARG;
1071
1072     if (IsEqualIID(&IID_IUnknown, iid) ||
1073         IsEqualIID(&IID_IWICBitmapFrameEncode, iid))
1074     {
1075         *ppv = &This->IWICBitmapFrameEncode_iface;
1076     }
1077     else
1078     {
1079         *ppv = NULL;
1080         return E_NOINTERFACE;
1081     }
1082
1083     IUnknown_AddRef((IUnknown*)*ppv);
1084     return S_OK;
1085 }
1086
1087 static ULONG WINAPI PngFrameEncode_AddRef(IWICBitmapFrameEncode *iface)
1088 {
1089     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
1090     return IWICBitmapEncoder_AddRef(&This->IWICBitmapEncoder_iface);
1091 }
1092
1093 static ULONG WINAPI PngFrameEncode_Release(IWICBitmapFrameEncode *iface)
1094 {
1095     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
1096     return IWICBitmapEncoder_Release(&This->IWICBitmapEncoder_iface);
1097 }
1098
1099 static HRESULT WINAPI PngFrameEncode_Initialize(IWICBitmapFrameEncode *iface,
1100     IPropertyBag2 *pIEncoderOptions)
1101 {
1102     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
1103     TRACE("(%p,%p)\n", iface, pIEncoderOptions);
1104
1105     EnterCriticalSection(&This->lock);
1106
1107     if (This->frame_initialized)
1108     {
1109         LeaveCriticalSection(&This->lock);
1110         return WINCODEC_ERR_WRONGSTATE;
1111     }
1112
1113     This->frame_initialized = TRUE;
1114
1115     LeaveCriticalSection(&This->lock);
1116
1117     return S_OK;
1118 }
1119
1120 static HRESULT WINAPI PngFrameEncode_SetSize(IWICBitmapFrameEncode *iface,
1121     UINT uiWidth, UINT uiHeight)
1122 {
1123     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
1124     TRACE("(%p,%u,%u)\n", iface, uiWidth, uiHeight);
1125
1126     EnterCriticalSection(&This->lock);
1127
1128     if (!This->frame_initialized || This->info_written)
1129     {
1130         LeaveCriticalSection(&This->lock);
1131         return WINCODEC_ERR_WRONGSTATE;
1132     }
1133
1134     This->width = uiWidth;
1135     This->height = uiHeight;
1136
1137     LeaveCriticalSection(&This->lock);
1138
1139     return S_OK;
1140 }
1141
1142 static HRESULT WINAPI PngFrameEncode_SetResolution(IWICBitmapFrameEncode *iface,
1143     double dpiX, double dpiY)
1144 {
1145     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
1146     TRACE("(%p,%0.2f,%0.2f)\n", iface, dpiX, dpiY);
1147
1148     EnterCriticalSection(&This->lock);
1149
1150     if (!This->frame_initialized || This->info_written)
1151     {
1152         LeaveCriticalSection(&This->lock);
1153         return WINCODEC_ERR_WRONGSTATE;
1154     }
1155
1156     This->xres = dpiX;
1157     This->yres = dpiY;
1158
1159     LeaveCriticalSection(&This->lock);
1160
1161     return S_OK;
1162 }
1163
1164 static HRESULT WINAPI PngFrameEncode_SetPixelFormat(IWICBitmapFrameEncode *iface,
1165     WICPixelFormatGUID *pPixelFormat)
1166 {
1167     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
1168     int i;
1169     TRACE("(%p,%s)\n", iface, debugstr_guid(pPixelFormat));
1170
1171     EnterCriticalSection(&This->lock);
1172
1173     if (!This->frame_initialized || This->info_written)
1174     {
1175         LeaveCriticalSection(&This->lock);
1176         return WINCODEC_ERR_WRONGSTATE;
1177     }
1178
1179     for (i=0; formats[i].guid; i++)
1180     {
1181         if (memcmp(formats[i].guid, pPixelFormat, sizeof(GUID)) == 0)
1182             break;
1183     }
1184
1185     if (!formats[i].guid) i = 0;
1186
1187     This->format = &formats[i];
1188     memcpy(pPixelFormat, This->format->guid, sizeof(GUID));
1189
1190     LeaveCriticalSection(&This->lock);
1191
1192     return S_OK;
1193 }
1194
1195 static HRESULT WINAPI PngFrameEncode_SetColorContexts(IWICBitmapFrameEncode *iface,
1196     UINT cCount, IWICColorContext **ppIColorContext)
1197 {
1198     FIXME("(%p,%u,%p): stub\n", iface, cCount, ppIColorContext);
1199     return E_NOTIMPL;
1200 }
1201
1202 static HRESULT WINAPI PngFrameEncode_SetPalette(IWICBitmapFrameEncode *iface,
1203     IWICPalette *pIPalette)
1204 {
1205     FIXME("(%p,%p): stub\n", iface, pIPalette);
1206     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
1207 }
1208
1209 static HRESULT WINAPI PngFrameEncode_SetThumbnail(IWICBitmapFrameEncode *iface,
1210     IWICBitmapSource *pIThumbnail)
1211 {
1212     FIXME("(%p,%p): stub\n", iface, pIThumbnail);
1213     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
1214 }
1215
1216 static HRESULT WINAPI PngFrameEncode_WritePixels(IWICBitmapFrameEncode *iface,
1217     UINT lineCount, UINT cbStride, UINT cbBufferSize, BYTE *pbPixels)
1218 {
1219     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
1220     png_byte **row_pointers=NULL;
1221     UINT i;
1222     jmp_buf jmpbuf;
1223     TRACE("(%p,%u,%u,%u,%p)\n", iface, lineCount, cbStride, cbBufferSize, pbPixels);
1224
1225     EnterCriticalSection(&This->lock);
1226
1227     if (!This->frame_initialized || !This->width || !This->height || !This->format)
1228     {
1229         LeaveCriticalSection(&This->lock);
1230         return WINCODEC_ERR_WRONGSTATE;
1231     }
1232
1233     if (lineCount == 0 || lineCount + This->lines_written > This->height)
1234     {
1235         LeaveCriticalSection(&This->lock);
1236         return E_INVALIDARG;
1237     }
1238
1239     /* set up setjmp/longjmp error handling */
1240     if (setjmp(jmpbuf))
1241     {
1242         LeaveCriticalSection(&This->lock);
1243         HeapFree(GetProcessHeap(), 0, row_pointers);
1244         return E_FAIL;
1245     }
1246     ppng_set_error_fn(This->png_ptr, jmpbuf, user_error_fn, user_warning_fn);
1247
1248     if (!This->info_written)
1249     {
1250         ppng_set_IHDR(This->png_ptr, This->info_ptr, This->width, This->height,
1251             This->format->bit_depth, This->format->color_type, PNG_INTERLACE_NONE,
1252             PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
1253
1254         if (This->xres != 0.0 && This->yres != 0.0)
1255         {
1256             ppng_set_pHYs(This->png_ptr, This->info_ptr, (This->xres+0.0127) / 0.0254,
1257                 (This->yres+0.0127) / 0.0254, PNG_RESOLUTION_METER);
1258         }
1259
1260         ppng_write_info(This->png_ptr, This->info_ptr);
1261
1262         if (This->format->remove_filler)
1263             ppng_set_filler(This->png_ptr, 0, PNG_FILLER_AFTER);
1264
1265         if (This->format->swap_rgb)
1266             ppng_set_bgr(This->png_ptr);
1267
1268         This->info_written = TRUE;
1269     }
1270
1271     row_pointers = HeapAlloc(GetProcessHeap(), 0, lineCount * sizeof(png_byte*));
1272     if (!row_pointers)
1273     {
1274         LeaveCriticalSection(&This->lock);
1275         return E_OUTOFMEMORY;
1276     }
1277
1278     for (i=0; i<lineCount; i++)
1279         row_pointers[i] = pbPixels + cbStride * i;
1280
1281     ppng_write_rows(This->png_ptr, row_pointers, lineCount);
1282     This->lines_written += lineCount;
1283
1284     LeaveCriticalSection(&This->lock);
1285
1286     HeapFree(GetProcessHeap(), 0, row_pointers);
1287
1288     return S_OK;
1289 }
1290
1291 static HRESULT WINAPI PngFrameEncode_WriteSource(IWICBitmapFrameEncode *iface,
1292     IWICBitmapSource *pIBitmapSource, WICRect *prc)
1293 {
1294     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
1295     HRESULT hr;
1296     WICRect rc;
1297     WICPixelFormatGUID guid;
1298     UINT stride;
1299     BYTE *pixeldata;
1300     TRACE("(%p,%p,%p)\n", iface, pIBitmapSource, prc);
1301
1302     if (!This->frame_initialized || !This->width || !This->height)
1303         return WINCODEC_ERR_WRONGSTATE;
1304
1305     if (!This->format)
1306     {
1307         hr = IWICBitmapSource_GetPixelFormat(pIBitmapSource, &guid);
1308         if (FAILED(hr)) return hr;
1309         hr = IWICBitmapFrameEncode_SetPixelFormat(iface, &guid);
1310         if (FAILED(hr)) return hr;
1311     }
1312
1313     hr = IWICBitmapSource_GetPixelFormat(pIBitmapSource, &guid);
1314     if (FAILED(hr)) return hr;
1315     if (memcmp(&guid, This->format->guid, sizeof(GUID)) != 0)
1316     {
1317         /* FIXME: should use WICConvertBitmapSource to convert */
1318         ERR("format %s unsupported\n", debugstr_guid(&guid));
1319         return E_FAIL;
1320     }
1321
1322     if (This->xres == 0.0 || This->yres == 0.0)
1323     {
1324         double xres, yres;
1325         hr = IWICBitmapSource_GetResolution(pIBitmapSource, &xres, &yres);
1326         if (FAILED(hr)) return hr;
1327         hr = IWICBitmapFrameEncode_SetResolution(iface, xres, yres);
1328         if (FAILED(hr)) return hr;
1329     }
1330
1331     if (!prc)
1332     {
1333         UINT width, height;
1334         hr = IWICBitmapSource_GetSize(pIBitmapSource, &width, &height);
1335         if (FAILED(hr)) return hr;
1336         rc.X = 0;
1337         rc.Y = 0;
1338         rc.Width = width;
1339         rc.Height = height;
1340         prc = &rc;
1341     }
1342
1343     if (prc->Width != This->width) return E_INVALIDARG;
1344
1345     stride = (This->format->bpp * This->width + 7)/8;
1346
1347     pixeldata = HeapAlloc(GetProcessHeap(), 0, stride * prc->Height);
1348     if (!pixeldata) return E_OUTOFMEMORY;
1349
1350     hr = IWICBitmapSource_CopyPixels(pIBitmapSource, prc, stride,
1351         stride*prc->Height, pixeldata);
1352
1353     if (SUCCEEDED(hr))
1354     {
1355         hr = IWICBitmapFrameEncode_WritePixels(iface, prc->Height, stride,
1356             stride*prc->Height, pixeldata);
1357     }
1358
1359     HeapFree(GetProcessHeap(), 0, pixeldata);
1360
1361     return hr;
1362 }
1363
1364 static HRESULT WINAPI PngFrameEncode_Commit(IWICBitmapFrameEncode *iface)
1365 {
1366     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
1367     jmp_buf jmpbuf;
1368     TRACE("(%p)\n", iface);
1369
1370     EnterCriticalSection(&This->lock);
1371
1372     if (!This->info_written || This->lines_written != This->height || This->frame_committed)
1373     {
1374         LeaveCriticalSection(&This->lock);
1375         return WINCODEC_ERR_WRONGSTATE;
1376     }
1377
1378     /* set up setjmp/longjmp error handling */
1379     if (setjmp(jmpbuf))
1380     {
1381         LeaveCriticalSection(&This->lock);
1382         return E_FAIL;
1383     }
1384     ppng_set_error_fn(This->png_ptr, jmpbuf, user_error_fn, user_warning_fn);
1385
1386     ppng_write_end(This->png_ptr, This->info_ptr);
1387
1388     This->frame_committed = TRUE;
1389
1390     LeaveCriticalSection(&This->lock);
1391
1392     return S_OK;
1393 }
1394
1395 static HRESULT WINAPI PngFrameEncode_GetMetadataQueryWriter(IWICBitmapFrameEncode *iface,
1396     IWICMetadataQueryWriter **ppIMetadataQueryWriter)
1397 {
1398     FIXME("(%p, %p): stub\n", iface, ppIMetadataQueryWriter);
1399     return E_NOTIMPL;
1400 }
1401
1402 static const IWICBitmapFrameEncodeVtbl PngEncoder_FrameVtbl = {
1403     PngFrameEncode_QueryInterface,
1404     PngFrameEncode_AddRef,
1405     PngFrameEncode_Release,
1406     PngFrameEncode_Initialize,
1407     PngFrameEncode_SetSize,
1408     PngFrameEncode_SetResolution,
1409     PngFrameEncode_SetPixelFormat,
1410     PngFrameEncode_SetColorContexts,
1411     PngFrameEncode_SetPalette,
1412     PngFrameEncode_SetThumbnail,
1413     PngFrameEncode_WritePixels,
1414     PngFrameEncode_WriteSource,
1415     PngFrameEncode_Commit,
1416     PngFrameEncode_GetMetadataQueryWriter
1417 };
1418
1419 static HRESULT WINAPI PngEncoder_QueryInterface(IWICBitmapEncoder *iface, REFIID iid,
1420     void **ppv)
1421 {
1422     PngEncoder *This = impl_from_IWICBitmapEncoder(iface);
1423     TRACE("(%p,%s,%p)\n", iface, debugstr_guid(iid), ppv);
1424
1425     if (!ppv) return E_INVALIDARG;
1426
1427     if (IsEqualIID(&IID_IUnknown, iid) ||
1428         IsEqualIID(&IID_IWICBitmapEncoder, iid))
1429     {
1430         *ppv = &This->IWICBitmapEncoder_iface;
1431     }
1432     else
1433     {
1434         *ppv = NULL;
1435         return E_NOINTERFACE;
1436     }
1437
1438     IUnknown_AddRef((IUnknown*)*ppv);
1439     return S_OK;
1440 }
1441
1442 static ULONG WINAPI PngEncoder_AddRef(IWICBitmapEncoder *iface)
1443 {
1444     PngEncoder *This = impl_from_IWICBitmapEncoder(iface);
1445     ULONG ref = InterlockedIncrement(&This->ref);
1446
1447     TRACE("(%p) refcount=%u\n", iface, ref);
1448
1449     return ref;
1450 }
1451
1452 static ULONG WINAPI PngEncoder_Release(IWICBitmapEncoder *iface)
1453 {
1454     PngEncoder *This = impl_from_IWICBitmapEncoder(iface);
1455     ULONG ref = InterlockedDecrement(&This->ref);
1456
1457     TRACE("(%p) refcount=%u\n", iface, ref);
1458
1459     if (ref == 0)
1460     {
1461         This->lock.DebugInfo->Spare[0] = 0;
1462         DeleteCriticalSection(&This->lock);
1463         if (This->png_ptr)
1464             ppng_destroy_write_struct(&This->png_ptr, &This->info_ptr);
1465         if (This->stream)
1466             IStream_Release(This->stream);
1467         HeapFree(GetProcessHeap(), 0, This);
1468     }
1469
1470     return ref;
1471 }
1472
1473 static void user_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
1474 {
1475     PngEncoder *This = ppng_get_io_ptr(png_ptr);
1476     HRESULT hr;
1477     ULONG byteswritten;
1478
1479     hr = IStream_Write(This->stream, data, length, &byteswritten);
1480     if (FAILED(hr) || byteswritten != length)
1481     {
1482         ppng_error(png_ptr, "failed writing data");
1483     }
1484 }
1485
1486 static void user_flush(png_structp png_ptr)
1487 {
1488 }
1489
1490 static HRESULT WINAPI PngEncoder_Initialize(IWICBitmapEncoder *iface,
1491     IStream *pIStream, WICBitmapEncoderCacheOption cacheOption)
1492 {
1493     PngEncoder *This = impl_from_IWICBitmapEncoder(iface);
1494     jmp_buf jmpbuf;
1495
1496     TRACE("(%p,%p,%u)\n", iface, pIStream, cacheOption);
1497
1498     EnterCriticalSection(&This->lock);
1499
1500     if (This->png_ptr)
1501     {
1502         LeaveCriticalSection(&This->lock);
1503         return WINCODEC_ERR_WRONGSTATE;
1504     }
1505
1506     /* initialize libpng */
1507     This->png_ptr = ppng_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
1508     if (!This->png_ptr)
1509     {
1510         LeaveCriticalSection(&This->lock);
1511         return E_FAIL;
1512     }
1513
1514     This->info_ptr = ppng_create_info_struct(This->png_ptr);
1515     if (!This->info_ptr)
1516     {
1517         ppng_destroy_write_struct(&This->png_ptr, NULL);
1518         This->png_ptr = NULL;
1519         LeaveCriticalSection(&This->lock);
1520         return E_FAIL;
1521     }
1522
1523     IStream_AddRef(pIStream);
1524     This->stream = pIStream;
1525
1526     /* set up setjmp/longjmp error handling */
1527     if (setjmp(jmpbuf))
1528     {
1529         ppng_destroy_write_struct(&This->png_ptr, &This->info_ptr);
1530         This->png_ptr = NULL;
1531         IStream_Release(This->stream);
1532         This->stream = NULL;
1533         LeaveCriticalSection(&This->lock);
1534         return E_FAIL;
1535     }
1536     ppng_set_error_fn(This->png_ptr, jmpbuf, user_error_fn, user_warning_fn);
1537
1538     /* set up custom i/o handling */
1539     ppng_set_write_fn(This->png_ptr, This, user_write_data, user_flush);
1540
1541     LeaveCriticalSection(&This->lock);
1542
1543     return S_OK;
1544 }
1545
1546 static HRESULT WINAPI PngEncoder_GetContainerFormat(IWICBitmapEncoder *iface,
1547     GUID *pguidContainerFormat)
1548 {
1549     FIXME("(%p,%s): stub\n", iface, debugstr_guid(pguidContainerFormat));
1550     return E_NOTIMPL;
1551 }
1552
1553 static HRESULT WINAPI PngEncoder_GetEncoderInfo(IWICBitmapEncoder *iface,
1554     IWICBitmapEncoderInfo **ppIEncoderInfo)
1555 {
1556     FIXME("(%p,%p): stub\n", iface, ppIEncoderInfo);
1557     return E_NOTIMPL;
1558 }
1559
1560 static HRESULT WINAPI PngEncoder_SetColorContexts(IWICBitmapEncoder *iface,
1561     UINT cCount, IWICColorContext **ppIColorContext)
1562 {
1563     FIXME("(%p,%u,%p): stub\n", iface, cCount, ppIColorContext);
1564     return E_NOTIMPL;
1565 }
1566
1567 static HRESULT WINAPI PngEncoder_SetPalette(IWICBitmapEncoder *iface, IWICPalette *pIPalette)
1568 {
1569     TRACE("(%p,%p)\n", iface, pIPalette);
1570     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
1571 }
1572
1573 static HRESULT WINAPI PngEncoder_SetThumbnail(IWICBitmapEncoder *iface, IWICBitmapSource *pIThumbnail)
1574 {
1575     TRACE("(%p,%p)\n", iface, pIThumbnail);
1576     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
1577 }
1578
1579 static HRESULT WINAPI PngEncoder_SetPreview(IWICBitmapEncoder *iface, IWICBitmapSource *pIPreview)
1580 {
1581     TRACE("(%p,%p)\n", iface, pIPreview);
1582     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
1583 }
1584
1585 static HRESULT WINAPI PngEncoder_CreateNewFrame(IWICBitmapEncoder *iface,
1586     IWICBitmapFrameEncode **ppIFrameEncode, IPropertyBag2 **ppIEncoderOptions)
1587 {
1588     PngEncoder *This = impl_from_IWICBitmapEncoder(iface);
1589     HRESULT hr;
1590     TRACE("(%p,%p,%p)\n", iface, ppIFrameEncode, ppIEncoderOptions);
1591
1592     EnterCriticalSection(&This->lock);
1593
1594     if (This->frame_count != 0)
1595     {
1596         LeaveCriticalSection(&This->lock);
1597         return WINCODEC_ERR_UNSUPPORTEDOPERATION;
1598     }
1599
1600     if (!This->stream)
1601     {
1602         LeaveCriticalSection(&This->lock);
1603         return WINCODEC_ERR_NOTINITIALIZED;
1604     }
1605
1606     hr = CreatePropertyBag2(ppIEncoderOptions);
1607     if (FAILED(hr))
1608     {
1609         LeaveCriticalSection(&This->lock);
1610         return hr;
1611     }
1612
1613     This->frame_count = 1;
1614
1615     LeaveCriticalSection(&This->lock);
1616
1617     IWICBitmapEncoder_AddRef(iface);
1618     *ppIFrameEncode = &This->IWICBitmapFrameEncode_iface;
1619
1620     return S_OK;
1621 }
1622
1623 static HRESULT WINAPI PngEncoder_Commit(IWICBitmapEncoder *iface)
1624 {
1625     PngEncoder *This = impl_from_IWICBitmapEncoder(iface);
1626     TRACE("(%p)\n", iface);
1627
1628     EnterCriticalSection(&This->lock);
1629
1630     if (!This->frame_committed || This->committed)
1631     {
1632         LeaveCriticalSection(&This->lock);
1633         return WINCODEC_ERR_WRONGSTATE;
1634     }
1635
1636     This->committed = TRUE;
1637
1638     LeaveCriticalSection(&This->lock);
1639
1640     return S_OK;
1641 }
1642
1643 static HRESULT WINAPI PngEncoder_GetMetadataQueryWriter(IWICBitmapEncoder *iface,
1644     IWICMetadataQueryWriter **ppIMetadataQueryWriter)
1645 {
1646     FIXME("(%p,%p): stub\n", iface, ppIMetadataQueryWriter);
1647     return E_NOTIMPL;
1648 }
1649
1650 static const IWICBitmapEncoderVtbl PngEncoder_Vtbl = {
1651     PngEncoder_QueryInterface,
1652     PngEncoder_AddRef,
1653     PngEncoder_Release,
1654     PngEncoder_Initialize,
1655     PngEncoder_GetContainerFormat,
1656     PngEncoder_GetEncoderInfo,
1657     PngEncoder_SetColorContexts,
1658     PngEncoder_SetPalette,
1659     PngEncoder_SetThumbnail,
1660     PngEncoder_SetPreview,
1661     PngEncoder_CreateNewFrame,
1662     PngEncoder_Commit,
1663     PngEncoder_GetMetadataQueryWriter
1664 };
1665
1666 HRESULT PngEncoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv)
1667 {
1668     PngEncoder *This;
1669     HRESULT ret;
1670
1671     TRACE("(%p,%s,%p)\n", pUnkOuter, debugstr_guid(iid), ppv);
1672
1673     *ppv = NULL;
1674
1675     if (pUnkOuter) return CLASS_E_NOAGGREGATION;
1676
1677     if (!libpng_handle && !load_libpng())
1678     {
1679         ERR("Failed writing PNG because unable to find %s\n",SONAME_LIBPNG);
1680         return E_FAIL;
1681     }
1682
1683     This = HeapAlloc(GetProcessHeap(), 0, sizeof(PngEncoder));
1684     if (!This) return E_OUTOFMEMORY;
1685
1686     This->IWICBitmapEncoder_iface.lpVtbl = &PngEncoder_Vtbl;
1687     This->IWICBitmapFrameEncode_iface.lpVtbl = &PngEncoder_FrameVtbl;
1688     This->ref = 1;
1689     This->png_ptr = NULL;
1690     This->info_ptr = NULL;
1691     This->stream = NULL;
1692     This->frame_count = 0;
1693     This->frame_initialized = FALSE;
1694     This->format = NULL;
1695     This->info_written = FALSE;
1696     This->width = 0;
1697     This->height = 0;
1698     This->xres = 0.0;
1699     This->yres = 0.0;
1700     This->lines_written = 0;
1701     This->frame_committed = FALSE;
1702     This->committed = FALSE;
1703     InitializeCriticalSection(&This->lock);
1704     This->lock.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": PngEncoder.lock");
1705
1706     ret = IWICBitmapEncoder_QueryInterface(&This->IWICBitmapEncoder_iface, iid, ppv);
1707     IWICBitmapEncoder_Release(&This->IWICBitmapEncoder_iface);
1708
1709     return ret;
1710 }
1711
1712 #else /* !HAVE_PNG_H */
1713
1714 HRESULT PngDecoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv)
1715 {
1716     ERR("Trying to load PNG picture, but PNG support is not compiled in.\n");
1717     return E_FAIL;
1718 }
1719
1720 HRESULT PngEncoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv)
1721 {
1722     ERR("Trying to save PNG picture, but PNG support is not compiled in.\n");
1723     return E_FAIL;
1724 }
1725
1726 #endif