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 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         /* Windows ignores CRC of the chunk */
  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(REFIID iid, void** ppv)
 152 {
 153     return MetadataReader_Create(&TextReader_Vtbl, 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_crc_action);
 178 MAKE_FUNCPTR(png_set_error_fn);
 179 #ifdef HAVE_PNG_SET_EXPAND_GRAY_1_2_4_TO_8
 180 MAKE_FUNCPTR(png_set_expand_gray_1_2_4_to_8);
 181 #else
 182 MAKE_FUNCPTR(png_set_gray_1_2_4_to_8);
 183 #endif
 184 MAKE_FUNCPTR(png_set_filler);
 185 MAKE_FUNCPTR(png_set_gray_to_rgb);
 186 MAKE_FUNCPTR(png_set_IHDR);
 187 MAKE_FUNCPTR(png_set_pHYs);
 188 MAKE_FUNCPTR(png_set_read_fn);
 189 MAKE_FUNCPTR(png_set_strip_16);
 190 MAKE_FUNCPTR(png_set_tRNS_to_alpha);
 191 MAKE_FUNCPTR(png_set_write_fn);
 192 MAKE_FUNCPTR(png_read_end);
 193 MAKE_FUNCPTR(png_read_image);
 194 MAKE_FUNCPTR(png_read_info);
 195 MAKE_FUNCPTR(png_write_end);
 196 MAKE_FUNCPTR(png_write_info);
 197 MAKE_FUNCPTR(png_write_rows);
 198 #undef MAKE_FUNCPTR
 199
 200 static void *load_libpng(void)
 201 {
 202     if((libpng_handle = wine_dlopen(SONAME_LIBPNG, RTLD_NOW, NULL, 0)) != NULL) {
 203
 204 #define LOAD_FUNCPTR(f) \
 205     if((p##f = wine_dlsym(libpng_handle, #f, NULL, 0)) == NULL) { \
 206         libpng_handle = NULL; \
 207         return NULL; \
 208     }
 209         LOAD_FUNCPTR(png_create_read_struct);
 210         LOAD_FUNCPTR(png_create_info_struct);
 211         LOAD_FUNCPTR(png_create_write_struct);
 212         LOAD_FUNCPTR(png_destroy_read_struct);
 213         LOAD_FUNCPTR(png_destroy_write_struct);
 214         LOAD_FUNCPTR(png_error);
 215         LOAD_FUNCPTR(png_get_bit_depth);
 216         LOAD_FUNCPTR(png_get_color_type);
 217         LOAD_FUNCPTR(png_get_error_ptr);
 218         LOAD_FUNCPTR(png_get_iCCP);
 219         LOAD_FUNCPTR(png_get_image_height);
 220         LOAD_FUNCPTR(png_get_image_width);
 221         LOAD_FUNCPTR(png_get_io_ptr);
 222         LOAD_FUNCPTR(png_get_pHYs);
 223         LOAD_FUNCPTR(png_get_PLTE);
 224         LOAD_FUNCPTR(png_get_tRNS);
 225         LOAD_FUNCPTR(png_set_bgr);
 226         LOAD_FUNCPTR(png_set_crc_action);
 227         LOAD_FUNCPTR(png_set_error_fn);
 228 #ifdef HAVE_PNG_SET_EXPAND_GRAY_1_2_4_TO_8
 229         LOAD_FUNCPTR(png_set_expand_gray_1_2_4_to_8);
 230 #else
 231         LOAD_FUNCPTR(png_set_gray_1_2_4_to_8);
 232 #endif
 233         LOAD_FUNCPTR(png_set_filler);
 234         LOAD_FUNCPTR(png_set_gray_to_rgb);
 235         LOAD_FUNCPTR(png_set_IHDR);
 236         LOAD_FUNCPTR(png_set_pHYs);
 237         LOAD_FUNCPTR(png_set_read_fn);
 238         LOAD_FUNCPTR(png_set_strip_16);
 239         LOAD_FUNCPTR(png_set_tRNS_to_alpha);
 240         LOAD_FUNCPTR(png_set_write_fn);
 241         LOAD_FUNCPTR(png_read_end);
 242         LOAD_FUNCPTR(png_read_image);
 243         LOAD_FUNCPTR(png_read_info);
 244         LOAD_FUNCPTR(png_write_end);
 245         LOAD_FUNCPTR(png_write_info);
 246         LOAD_FUNCPTR(png_write_rows);
 247
 248 #undef LOAD_FUNCPTR
 249     }
 250     return libpng_handle;
 251 }
 252
 253 static void user_error_fn(png_structp png_ptr, png_const_charp error_message)
 254 {
 255     jmp_buf *pjmpbuf;
 256
 257     /* This uses setjmp/longjmp just like the default. We can't use the
 258      * default because there's no way to access the jmp buffer in the png_struct
 259      * that works in 1.2 and 1.4 and allows us to dynamically load libpng. */
 260     WARN("PNG error: %s\n", debugstr_a(error_message));
 261     pjmpbuf = ppng_get_error_ptr(png_ptr);
 262     longjmp(*pjmpbuf, 1);
 263 }
 264
 265 static void user_warning_fn(png_structp png_ptr, png_const_charp warning_message)
 266 {
 267     WARN("PNG warning: %s\n", debugstr_a(warning_message));
 268 }
 269
 270 typedef struct {
 271     IWICBitmapDecoder IWICBitmapDecoder_iface;
 272     IWICBitmapFrameDecode IWICBitmapFrameDecode_iface;
 273     IWICMetadataBlockReader IWICMetadataBlockReader_iface;
 274     LONG ref;
 275     png_structp png_ptr;
 276     png_infop info_ptr;
 277     png_infop end_info;
 278     BOOL initialized;
 279     int bpp;
 280     int width, height;
 281     UINT stride;
 282     const WICPixelFormatGUID *format;
 283     BYTE *image_bits;
 284     CRITICAL_SECTION lock; /* must be held when png structures are accessed or initialized is set */
 285 } PngDecoder;
 286
 287 static inline PngDecoder *impl_from_IWICBitmapDecoder(IWICBitmapDecoder *iface)
 288 {
 289     return CONTAINING_RECORD(iface, PngDecoder, IWICBitmapDecoder_iface);
 290 }
 291
 292 static inline PngDecoder *impl_from_IWICBitmapFrameDecode(IWICBitmapFrameDecode *iface)
 293 {
 294     return CONTAINING_RECORD(iface, PngDecoder, IWICBitmapFrameDecode_iface);
 295 }
 296
 297 static inline PngDecoder *impl_from_IWICMetadataBlockReader(IWICMetadataBlockReader *iface)
 298 {
 299     return CONTAINING_RECORD(iface, PngDecoder, IWICMetadataBlockReader_iface);
 300 }
 301
 302 static const IWICBitmapFrameDecodeVtbl PngDecoder_FrameVtbl;
 303
 304 static HRESULT WINAPI PngDecoder_QueryInterface(IWICBitmapDecoder *iface, REFIID iid,
 305     void **ppv)
 306 {
 307     PngDecoder *This = impl_from_IWICBitmapDecoder(iface);
 308     TRACE("(%p,%s,%p)\n", iface, debugstr_guid(iid), ppv);
 309
 310     if (!ppv) return E_INVALIDARG;
 311
 312     if (IsEqualIID(&IID_IUnknown, iid) || IsEqualIID(&IID_IWICBitmapDecoder, iid))
 313     {
 314         *ppv = &This->IWICBitmapDecoder_iface;
 315     }
 316     else
 317     {
 318         *ppv = NULL;
 319         return E_NOINTERFACE;
 320     }
 321
 322     IUnknown_AddRef((IUnknown*)*ppv);
 323     return S_OK;
 324 }
 325
 326 static ULONG WINAPI PngDecoder_AddRef(IWICBitmapDecoder *iface)
 327 {
 328     PngDecoder *This = impl_from_IWICBitmapDecoder(iface);
 329     ULONG ref = InterlockedIncrement(&This->ref);
 330
 331     TRACE("(%p) refcount=%u\n", iface, ref);
 332
 333     return ref;
 334 }
 335
 336 static ULONG WINAPI PngDecoder_Release(IWICBitmapDecoder *iface)
 337 {
 338     PngDecoder *This = impl_from_IWICBitmapDecoder(iface);
 339     ULONG ref = InterlockedDecrement(&This->ref);
 340
 341     TRACE("(%p) refcount=%u\n", iface, ref);
 342
 343     if (ref == 0)
 344     {
 345         if (This->png_ptr)
 346             ppng_destroy_read_struct(&This->png_ptr, &This->info_ptr, &This->end_info);
 347         This->lock.DebugInfo->Spare[0] = 0;
 348         DeleteCriticalSection(&This->lock);
 349         HeapFree(GetProcessHeap(), 0, This->image_bits);
 350         HeapFree(GetProcessHeap(), 0, This);
 351     }
 352
 353     return ref;
 354 }
 355
 356 static HRESULT WINAPI PngDecoder_QueryCapability(IWICBitmapDecoder *iface, IStream *stream,
 357     DWORD *capability)
 358 {
 359     HRESULT hr;
 360
 361     TRACE("(%p,%p,%p)\n", iface, stream, capability);
 362
 363     if (!stream || !capability) return E_INVALIDARG;
 364
 365     hr = IWICBitmapDecoder_Initialize(iface, stream, WICDecodeMetadataCacheOnDemand);
 366     if (hr != S_OK) return hr;
 367
 368     *capability = WICBitmapDecoderCapabilityCanDecodeAllImages |
 369                   WICBitmapDecoderCapabilityCanDecodeSomeImages;
 370     /* FIXME: WICBitmapDecoderCapabilityCanEnumerateMetadata */
 371     return S_OK;
 372 }
 373
 374 static void user_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 375 {
 376     IStream *stream = ppng_get_io_ptr(png_ptr);
 377     HRESULT hr;
 378     ULONG bytesread;
 379
 380     hr = IStream_Read(stream, data, length, &bytesread);
 381     if (FAILED(hr) || bytesread != length)
 382     {
 383         ppng_error(png_ptr, "failed reading data");
 384     }
 385 }
 386
 387 static HRESULT WINAPI PngDecoder_Initialize(IWICBitmapDecoder *iface, IStream *pIStream,
 388     WICDecodeOptions cacheOptions)
 389 {
 390     PngDecoder *This = impl_from_IWICBitmapDecoder(iface);
 391     LARGE_INTEGER seek;
 392     HRESULT hr=S_OK;
 393     png_bytep *row_pointers=NULL;
 394     UINT image_size;
 395     UINT i;
 396     int color_type, bit_depth;
 397     png_bytep trans;
 398     int num_trans;
 399     png_uint_32 transparency;
 400     png_color_16p trans_values;
 401     jmp_buf jmpbuf;
 402
 403     TRACE("(%p,%p,%x)\n", iface, pIStream, cacheOptions);
 404
 405     EnterCriticalSection(&This->lock);
 406
 407     /* initialize libpng */
 408     This->png_ptr = ppng_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
 409     if (!This->png_ptr)
 410     {
 411         hr = E_FAIL;
 412         goto end;
 413     }
 414
 415     This->info_ptr = ppng_create_info_struct(This->png_ptr);
 416     if (!This->info_ptr)
 417     {
 418         ppng_destroy_read_struct(&This->png_ptr, NULL, NULL);
 419         This->png_ptr = NULL;
 420         hr = E_FAIL;
 421         goto end;
 422     }
 423
 424     This->end_info = ppng_create_info_struct(This->png_ptr);
 425     if (!This->info_ptr)
 426     {
 427         ppng_destroy_read_struct(&This->png_ptr, &This->info_ptr, NULL);
 428         This->png_ptr = NULL;
 429         hr = E_FAIL;
 430         goto end;
 431     }
 432
 433     /* set up setjmp/longjmp error handling */
 434     if (setjmp(jmpbuf))
 435     {
 436         ppng_destroy_read_struct(&This->png_ptr, &This->info_ptr, &This->end_info);
 437         HeapFree(GetProcessHeap(), 0, row_pointers);
 438         This->png_ptr = NULL;
 439         hr = E_FAIL;
 440         goto end;
 441     }
 442     ppng_set_error_fn(This->png_ptr, jmpbuf, user_error_fn, user_warning_fn);
 443     ppng_set_crc_action(This->png_ptr, PNG_CRC_QUIET_USE, PNG_CRC_QUIET_USE);
 444
 445     /* seek to the start of the stream */
 446     seek.QuadPart = 0;
 447     hr = IStream_Seek(pIStream, seek, STREAM_SEEK_SET, NULL);
 448     if (FAILED(hr)) goto end;
 449
 450     /* set up custom i/o handling */
 451     ppng_set_read_fn(This->png_ptr, pIStream, user_read_data);
 452
 453     /* read the header */
 454     ppng_read_info(This->png_ptr, This->info_ptr);
 455
 456     /* choose a pixel format */
 457     color_type = ppng_get_color_type(This->png_ptr, This->info_ptr);
 458     bit_depth = ppng_get_bit_depth(This->png_ptr, This->info_ptr);
 459
 460     /* check for color-keyed alpha */
 461     transparency = ppng_get_tRNS(This->png_ptr, This->info_ptr, &trans, &num_trans, &trans_values);
 462
 463     if (transparency && color_type != PNG_COLOR_TYPE_PALETTE)
 464     {
 465         /* expand to RGBA */
 466         if (color_type == PNG_COLOR_TYPE_GRAY)
 467         {
 468             if (bit_depth < 8)
 469             {
 470 #ifdef HAVE_PNG_SET_EXPAND_GRAY_1_2_4_TO_8
 471                 ppng_set_expand_gray_1_2_4_to_8(This->png_ptr);
 472 #else
 473                 ppng_set_gray_1_2_4_to_8(This->png_ptr);
 474 #endif
 475                 bit_depth = 8;
 476             }
 477             ppng_set_gray_to_rgb(This->png_ptr);
 478         }
 479         ppng_set_tRNS_to_alpha(This->png_ptr);
 480         color_type = PNG_COLOR_TYPE_RGB_ALPHA;
 481     }
 482
 483     switch (color_type)
 484     {
 485     case PNG_COLOR_TYPE_GRAY:
 486         This->bpp = bit_depth;
 487         switch (bit_depth)
 488         {
 489         case 1: This->format = &GUID_WICPixelFormatBlackWhite; break;
 490         case 2: This->format = &GUID_WICPixelFormat2bppGray; break;
 491         case 4: This->format = &GUID_WICPixelFormat4bppGray; break;
 492         case 8: This->format = &GUID_WICPixelFormat8bppGray; break;
 493         case 16: This->format = &GUID_WICPixelFormat16bppGray; break;
 494         default:
 495             ERR("invalid grayscale bit depth: %i\n", bit_depth);
 496             hr = E_FAIL;
 497             goto end;
 498         }
 499         break;
 500     case PNG_COLOR_TYPE_GRAY_ALPHA:
 501         /* WIC does not support grayscale alpha formats so use RGBA */
 502         ppng_set_gray_to_rgb(This->png_ptr);
 503         /* fall through */
 504     case PNG_COLOR_TYPE_RGB_ALPHA:
 505         This->bpp = bit_depth * 4;
 506         switch (bit_depth)
 507         {
 508         case 8:
 509             ppng_set_bgr(This->png_ptr);
 510             This->format = &GUID_WICPixelFormat32bppBGRA;
 511             break;
 512         case 16: This->format = &GUID_WICPixelFormat64bppRGBA; break;
 513         default:
 514             ERR("invalid RGBA bit depth: %i\n", bit_depth);
 515             hr = E_FAIL;
 516             goto end;
 517         }
 518         break;
 519     case PNG_COLOR_TYPE_PALETTE:
 520         This->bpp = bit_depth;
 521         switch (bit_depth)
 522         {
 523         case 1: This->format = &GUID_WICPixelFormat1bppIndexed; break;
 524         case 2: This->format = &GUID_WICPixelFormat2bppIndexed; break;
 525         case 4: This->format = &GUID_WICPixelFormat4bppIndexed; break;
 526         case 8: This->format = &GUID_WICPixelFormat8bppIndexed; break;
 527         default:
 528             ERR("invalid indexed color bit depth: %i\n", bit_depth);
 529             hr = E_FAIL;
 530             goto end;
 531         }
 532         break;
 533     case PNG_COLOR_TYPE_RGB:
 534         This->bpp = bit_depth * 3;
 535         switch (bit_depth)
 536         {
 537         case 8:
 538             ppng_set_bgr(This->png_ptr);
 539             This->format = &GUID_WICPixelFormat24bppBGR;
 540             break;
 541         case 16: This->format = &GUID_WICPixelFormat48bppRGB; break;
 542         default:
 543             ERR("invalid RGB color bit depth: %i\n", bit_depth);
 544             hr = E_FAIL;
 545             goto end;
 546         }
 547         break;
 548     default:
 549         ERR("invalid color type %i\n", color_type);
 550         hr = E_FAIL;
 551         goto end;
 552     }
 553
 554     /* read the image data */
 555     This->width = ppng_get_image_width(This->png_ptr, This->info_ptr);
 556     This->height = ppng_get_image_height(This->png_ptr, This->info_ptr);
 557     This->stride = This->width * This->bpp;
 558     image_size = This->stride * This->height;
 559
 560     This->image_bits = HeapAlloc(GetProcessHeap(), 0, image_size);
 561     if (!This->image_bits)
 562     {
 563         hr = E_OUTOFMEMORY;
 564         goto end;
 565     }
 566
 567     row_pointers = HeapAlloc(GetProcessHeap(), 0, sizeof(png_bytep)*This->height);
 568     if (!row_pointers)
 569     {
 570         hr = E_OUTOFMEMORY;
 571         goto end;
 572     }
 573
 574     for (i=0; i<This->height; i++)
 575         row_pointers[i] = This->image_bits + i * This->stride;
 576
 577     ppng_read_image(This->png_ptr, row_pointers);
 578
 579     HeapFree(GetProcessHeap(), 0, row_pointers);
 580     row_pointers = NULL;
 581
 582     ppng_read_end(This->png_ptr, This->end_info);
 583
 584     This->initialized = TRUE;
 585
 586 end:
 587
 588     LeaveCriticalSection(&This->lock);
 589
 590     return hr;
 591 }
 592
 593 static HRESULT WINAPI PngDecoder_GetContainerFormat(IWICBitmapDecoder *iface,
 594     GUID *pguidContainerFormat)
 595 {
 596     memcpy(pguidContainerFormat, &GUID_ContainerFormatPng, sizeof(GUID));
 597     return S_OK;
 598 }
 599
 600 static HRESULT WINAPI PngDecoder_GetDecoderInfo(IWICBitmapDecoder *iface,
 601     IWICBitmapDecoderInfo **ppIDecoderInfo)
 602 {
 603     HRESULT hr;
 604     IWICComponentInfo *compinfo;
 605
 606     TRACE("(%p,%p)\n", iface, ppIDecoderInfo);
 607
 608     hr = CreateComponentInfo(&CLSID_WICPngDecoder, &compinfo);
 609     if (FAILED(hr)) return hr;
 610
 611     hr = IWICComponentInfo_QueryInterface(compinfo, &IID_IWICBitmapDecoderInfo,
 612         (void**)ppIDecoderInfo);
 613
 614     IWICComponentInfo_Release(compinfo);
 615
 616     return hr;
 617 }
 618
 619 static HRESULT WINAPI PngDecoder_CopyPalette(IWICBitmapDecoder *iface,
 620     IWICPalette *pIPalette)
 621 {
 622     FIXME("(%p,%p): stub\n", iface, pIPalette);
 623     return E_NOTIMPL;
 624 }
 625
 626 static HRESULT WINAPI PngDecoder_GetMetadataQueryReader(IWICBitmapDecoder *iface,
 627     IWICMetadataQueryReader **ppIMetadataQueryReader)
 628 {
 629     FIXME("(%p,%p): stub\n", iface, ppIMetadataQueryReader);
 630     return E_NOTIMPL;
 631 }
 632
 633 static HRESULT WINAPI PngDecoder_GetPreview(IWICBitmapDecoder *iface,
 634     IWICBitmapSource **ppIBitmapSource)
 635 {
 636     TRACE("(%p,%p)\n", iface, ppIBitmapSource);
 637
 638     if (!ppIBitmapSource) return E_INVALIDARG;
 639
 640     *ppIBitmapSource = NULL;
 641     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 642 }
 643
 644 static HRESULT WINAPI PngDecoder_GetColorContexts(IWICBitmapDecoder *iface,
 645     UINT cCount, IWICColorContext **ppIColorContexts, UINT *pcActualCount)
 646 {
 647     TRACE("(%p,%u,%p,%p)\n", iface, cCount, ppIColorContexts, pcActualCount);
 648     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 649 }
 650
 651 static HRESULT WINAPI PngDecoder_GetThumbnail(IWICBitmapDecoder *iface,
 652     IWICBitmapSource **ppIThumbnail)
 653 {
 654     TRACE("(%p,%p)\n", iface, ppIThumbnail);
 655
 656     if (!ppIThumbnail) return E_INVALIDARG;
 657
 658     *ppIThumbnail = NULL;
 659     return WINCODEC_ERR_CODECNOTHUMBNAIL;
 660 }
 661
 662 static HRESULT WINAPI PngDecoder_GetFrameCount(IWICBitmapDecoder *iface,
 663     UINT *pCount)
 664 {
 665     if (!pCount) return E_INVALIDARG;
 666
 667     *pCount = 1;
 668     return S_OK;
 669 }
 670
 671 static HRESULT WINAPI PngDecoder_GetFrame(IWICBitmapDecoder *iface,
 672     UINT index, IWICBitmapFrameDecode **ppIBitmapFrame)
 673 {
 674     PngDecoder *This = impl_from_IWICBitmapDecoder(iface);
 675     TRACE("(%p,%u,%p)\n", iface, index, ppIBitmapFrame);
 676
 677     if (!This->initialized) return WINCODEC_ERR_FRAMEMISSING;
 678
 679     if (index != 0) return E_INVALIDARG;
 680
 681     IWICBitmapDecoder_AddRef(iface);
 682
 683     *ppIBitmapFrame = &This->IWICBitmapFrameDecode_iface;
 684
 685     return S_OK;
 686 }
 687
 688 static const IWICBitmapDecoderVtbl PngDecoder_Vtbl = {
 689     PngDecoder_QueryInterface,
 690     PngDecoder_AddRef,
 691     PngDecoder_Release,
 692     PngDecoder_QueryCapability,
 693     PngDecoder_Initialize,
 694     PngDecoder_GetContainerFormat,
 695     PngDecoder_GetDecoderInfo,
 696     PngDecoder_CopyPalette,
 697     PngDecoder_GetMetadataQueryReader,
 698     PngDecoder_GetPreview,
 699     PngDecoder_GetColorContexts,
 700     PngDecoder_GetThumbnail,
 701     PngDecoder_GetFrameCount,
 702     PngDecoder_GetFrame
 703 };
 704
 705 static HRESULT WINAPI PngDecoder_Frame_QueryInterface(IWICBitmapFrameDecode *iface, REFIID iid,
 706     void **ppv)
 707 {
 708     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 709     if (!ppv) return E_INVALIDARG;
 710
 711     if (IsEqualIID(&IID_IUnknown, iid) ||
 712         IsEqualIID(&IID_IWICBitmapSource, iid) ||
 713         IsEqualIID(&IID_IWICBitmapFrameDecode, iid))
 714     {
 715         *ppv = &This->IWICBitmapFrameDecode_iface;
 716     }
 717     else if (IsEqualIID(&IID_IWICMetadataBlockReader, iid))
 718     {
 719         *ppv = &This->IWICMetadataBlockReader_iface;
 720     }
 721     else
 722     {
 723         *ppv = NULL;
 724         return E_NOINTERFACE;
 725     }
 726
 727     IUnknown_AddRef((IUnknown*)*ppv);
 728     return S_OK;
 729 }
 730
 731 static ULONG WINAPI PngDecoder_Frame_AddRef(IWICBitmapFrameDecode *iface)
 732 {
 733     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 734     return IWICBitmapDecoder_AddRef(&This->IWICBitmapDecoder_iface);
 735 }
 736
 737 static ULONG WINAPI PngDecoder_Frame_Release(IWICBitmapFrameDecode *iface)
 738 {
 739     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 740     return IWICBitmapDecoder_Release(&This->IWICBitmapDecoder_iface);
 741 }
 742
 743 static HRESULT WINAPI PngDecoder_Frame_GetSize(IWICBitmapFrameDecode *iface,
 744     UINT *puiWidth, UINT *puiHeight)
 745 {
 746     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 747     *puiWidth = This->width;
 748     *puiHeight = This->height;
 749     TRACE("(%p)->(%u,%u)\n", iface, *puiWidth, *puiHeight);
 750     return S_OK;
 751 }
 752
 753 static HRESULT WINAPI PngDecoder_Frame_GetPixelFormat(IWICBitmapFrameDecode *iface,
 754     WICPixelFormatGUID *pPixelFormat)
 755 {
 756     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 757     TRACE("(%p,%p)\n", iface, pPixelFormat);
 758
 759     memcpy(pPixelFormat, This->format, sizeof(GUID));
 760
 761     return S_OK;
 762 }
 763
 764 static HRESULT WINAPI PngDecoder_Frame_GetResolution(IWICBitmapFrameDecode *iface,
 765     double *pDpiX, double *pDpiY)
 766 {
 767     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 768     png_uint_32 ret, xres, yres;
 769     int unit_type;
 770
 771     EnterCriticalSection(&This->lock);
 772
 773     ret = ppng_get_pHYs(This->png_ptr, This->info_ptr, &xres, &yres, &unit_type);
 774
 775     if (ret && unit_type == PNG_RESOLUTION_METER)
 776     {
 777         *pDpiX = xres * 0.0254;
 778         *pDpiY = yres * 0.0254;
 779     }
 780     else
 781     {
 782         WARN("no pHYs block present\n");
 783         *pDpiX = *pDpiY = 96.0;
 784     }
 785
 786     LeaveCriticalSection(&This->lock);
 787
 788     TRACE("(%p)->(%0.2f,%0.2f)\n", iface, *pDpiX, *pDpiY);
 789
 790     return S_OK;
 791 }
 792
 793 static HRESULT WINAPI PngDecoder_Frame_CopyPalette(IWICBitmapFrameDecode *iface,
 794     IWICPalette *pIPalette)
 795 {
 796     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 797     png_uint_32 ret;
 798     png_colorp png_palette;
 799     int num_palette;
 800     WICColor palette[256];
 801     png_bytep trans_alpha;
 802     int num_trans;
 803     png_color_16p trans_values;
 804     int i;
 805     HRESULT hr=S_OK;
 806
 807     TRACE("(%p,%p)\n", iface, pIPalette);
 808
 809     EnterCriticalSection(&This->lock);
 810
 811     ret = ppng_get_PLTE(This->png_ptr, This->info_ptr, &png_palette, &num_palette);
 812     if (!ret)
 813     {
 814         hr = WINCODEC_ERR_PALETTEUNAVAILABLE;
 815         goto end;
 816     }
 817
 818     if (num_palette > 256)
 819     {
 820         ERR("palette has %i colors?!\n", num_palette);
 821         hr = E_FAIL;
 822         goto end;
 823     }
 824
 825     ret = ppng_get_tRNS(This->png_ptr, This->info_ptr, &trans_alpha, &num_trans, &trans_values);
 826     if (!ret) num_trans = 0;
 827
 828     for (i=0; i<num_palette; i++)
 829     {
 830         BYTE alpha = (i < num_trans) ? trans_alpha[i] : 0xff;
 831         palette[i] = (alpha << 24 |
 832                       png_palette[i].red << 16|
 833                       png_palette[i].green << 8|
 834                       png_palette[i].blue);
 835     }
 836
 837 end:
 838
 839     LeaveCriticalSection(&This->lock);
 840
 841     if (SUCCEEDED(hr))
 842         hr = IWICPalette_InitializeCustom(pIPalette, palette, num_palette);
 843
 844     return hr;
 845 }
 846
 847 static HRESULT WINAPI PngDecoder_Frame_CopyPixels(IWICBitmapFrameDecode *iface,
 848     const WICRect *prc, UINT cbStride, UINT cbBufferSize, BYTE *pbBuffer)
 849 {
 850     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 851     TRACE("(%p,%p,%u,%u,%p)\n", iface, prc, cbStride, cbBufferSize, pbBuffer);
 852
 853     return copy_pixels(This->bpp, This->image_bits,
 854         This->width, This->height, This->stride,
 855         prc, cbStride, cbBufferSize, pbBuffer);
 856 }
 857
 858 static HRESULT WINAPI PngDecoder_Frame_GetMetadataQueryReader(IWICBitmapFrameDecode *iface,
 859     IWICMetadataQueryReader **ppIMetadataQueryReader)
 860 {
 861     FIXME("(%p,%p): stub\n", iface, ppIMetadataQueryReader);
 862     return E_NOTIMPL;
 863 }
 864
 865 static HRESULT WINAPI PngDecoder_Frame_GetColorContexts(IWICBitmapFrameDecode *iface,
 866     UINT cCount, IWICColorContext **ppIColorContexts, UINT *pcActualCount)
 867 {
 868     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 869     png_charp name;
 870     BYTE *profile;
 871     png_uint_32 len;
 872     int compression_type;
 873     HRESULT hr;
 874
 875     TRACE("(%p,%u,%p,%p)\n", iface, cCount, ppIColorContexts, pcActualCount);
 876
 877     if (!pcActualCount) return E_INVALIDARG;
 878
 879     EnterCriticalSection(&This->lock);
 880
 881     if (ppng_get_iCCP(This->png_ptr, This->info_ptr, &name, &compression_type, (void *)&profile, &len))
 882     {
 883         if (cCount && ppIColorContexts)
 884         {
 885             hr = IWICColorContext_InitializeFromMemory(*ppIColorContexts, profile, len);
 886             if (FAILED(hr))
 887             {
 888                 LeaveCriticalSection(&This->lock);
 889                 return hr;
 890             }
 891         }
 892         *pcActualCount = 1;
 893     }
 894     else
 895         *pcActualCount = 0;
 896
 897     LeaveCriticalSection(&This->lock);
 898
 899     return S_OK;
 900 }
 901
 902 static HRESULT WINAPI PngDecoder_Frame_GetThumbnail(IWICBitmapFrameDecode *iface,
 903     IWICBitmapSource **ppIThumbnail)
 904 {
 905     TRACE("(%p,%p)\n", iface, ppIThumbnail);
 906
 907     if (!ppIThumbnail) return E_INVALIDARG;
 908
 909     *ppIThumbnail = NULL;
 910     return WINCODEC_ERR_CODECNOTHUMBNAIL;
 911 }
 912
 913 static const IWICBitmapFrameDecodeVtbl PngDecoder_FrameVtbl = {
 914     PngDecoder_Frame_QueryInterface,
 915     PngDecoder_Frame_AddRef,
 916     PngDecoder_Frame_Release,
 917     PngDecoder_Frame_GetSize,
 918     PngDecoder_Frame_GetPixelFormat,
 919     PngDecoder_Frame_GetResolution,
 920     PngDecoder_Frame_CopyPalette,
 921     PngDecoder_Frame_CopyPixels,
 922     PngDecoder_Frame_GetMetadataQueryReader,
 923     PngDecoder_Frame_GetColorContexts,
 924     PngDecoder_Frame_GetThumbnail
 925 };
 926
 927 static HRESULT WINAPI PngDecoder_Block_QueryInterface(IWICMetadataBlockReader *iface, REFIID iid,
 928     void **ppv)
 929 {
 930     PngDecoder *This = impl_from_IWICMetadataBlockReader(iface);
 931     return IWICBitmapFrameDecode_QueryInterface(&This->IWICBitmapFrameDecode_iface, iid, ppv);
 932 }
 933
 934 static ULONG WINAPI PngDecoder_Block_AddRef(IWICMetadataBlockReader *iface)
 935 {
 936     PngDecoder *This = impl_from_IWICMetadataBlockReader(iface);
 937     return IWICBitmapDecoder_AddRef(&This->IWICBitmapDecoder_iface);
 938 }
 939
 940 static ULONG WINAPI PngDecoder_Block_Release(IWICMetadataBlockReader *iface)
 941 {
 942     PngDecoder *This = impl_from_IWICMetadataBlockReader(iface);
 943     return IWICBitmapDecoder_Release(&This->IWICBitmapDecoder_iface);
 944 }
 945
 946 static HRESULT WINAPI PngDecoder_Block_GetContainerFormat(IWICMetadataBlockReader *iface,
 947     GUID *pguidContainerFormat)
 948 {
 949     if (!pguidContainerFormat) return E_INVALIDARG;
 950     memcpy(pguidContainerFormat, &GUID_ContainerFormatPng, sizeof(GUID));
 951     return S_OK;
 952 }
 953
 954 static HRESULT WINAPI PngDecoder_Block_GetCount(IWICMetadataBlockReader *iface,
 955     UINT *pcCount)
 956 {
 957     static int once;
 958     TRACE("%p,%p\n", iface, pcCount);
 959     if (!once++) FIXME("stub\n");
 960     return E_NOTIMPL;
 961 }
 962
 963 static HRESULT WINAPI PngDecoder_Block_GetReaderByIndex(IWICMetadataBlockReader *iface,
 964     UINT nIndex, IWICMetadataReader **ppIMetadataReader)
 965 {
 966     FIXME("%p,%d,%p\n", iface, nIndex, ppIMetadataReader);
 967     return E_NOTIMPL;
 968 }
 969
 970 static HRESULT WINAPI PngDecoder_Block_GetEnumerator(IWICMetadataBlockReader *iface,
 971     IEnumUnknown **ppIEnumMetadata)
 972 {
 973     FIXME("%p,%p\n", iface, ppIEnumMetadata);
 974     return E_NOTIMPL;
 975 }
 976
 977 static const IWICMetadataBlockReaderVtbl PngDecoder_BlockVtbl = {
 978     PngDecoder_Block_QueryInterface,
 979     PngDecoder_Block_AddRef,
 980     PngDecoder_Block_Release,
 981     PngDecoder_Block_GetContainerFormat,
 982     PngDecoder_Block_GetCount,
 983     PngDecoder_Block_GetReaderByIndex,
 984     PngDecoder_Block_GetEnumerator,
 985 };
 986
 987 HRESULT PngDecoder_CreateInstance(REFIID iid, void** ppv)
 988 {
 989     PngDecoder *This;
 990     HRESULT ret;
 991
 992     TRACE("(%s,%p)\n", debugstr_guid(iid), ppv);
 993
 994     *ppv = NULL;
 995
 996     if (!libpng_handle && !load_libpng())
 997     {
 998         ERR("Failed reading PNG because unable to find %s\n",SONAME_LIBPNG);
 999         return E_FAIL;
1000     }
1001
1002     This = HeapAlloc(GetProcessHeap(), 0, sizeof(PngDecoder));
1003     if (!This) return E_OUTOFMEMORY;
1004
1005     This->IWICBitmapDecoder_iface.lpVtbl = &PngDecoder_Vtbl;
1006     This->IWICBitmapFrameDecode_iface.lpVtbl = &PngDecoder_FrameVtbl;
1007     This->IWICMetadataBlockReader_iface.lpVtbl = &PngDecoder_BlockVtbl;
1008     This->ref = 1;
1009     This->png_ptr = NULL;
1010     This->info_ptr = NULL;
1011     This->end_info = NULL;
1012     This->initialized = FALSE;
1013     This->image_bits = NULL;
1014     InitializeCriticalSection(&This->lock);
1015     This->lock.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": PngDecoder.lock");
1016
1017     ret = IWICBitmapDecoder_QueryInterface(&This->IWICBitmapDecoder_iface, iid, ppv);
1018     IWICBitmapDecoder_Release(&This->IWICBitmapDecoder_iface);
1019
1020     return ret;
1021 }
1022
1023 struct png_pixelformat {
1024     const WICPixelFormatGUID *guid;
1025     UINT bpp;
1026     int bit_depth;
1027     int color_type;
1028     BOOL remove_filler;
1029     BOOL swap_rgb;
1030 };
1031
1032 static const struct png_pixelformat formats[] = {
1033     {&GUID_WICPixelFormat24bppBGR, 24, 8, PNG_COLOR_TYPE_RGB, 0, 1},
1034     {&GUID_WICPixelFormatBlackWhite, 1, 1, PNG_COLOR_TYPE_GRAY, 0, 0},
1035     {&GUID_WICPixelFormat2bppGray, 2, 2, PNG_COLOR_TYPE_GRAY, 0, 0},
1036     {&GUID_WICPixelFormat4bppGray, 4, 4, PNG_COLOR_TYPE_GRAY, 0, 0},
1037     {&GUID_WICPixelFormat8bppGray, 8, 8, PNG_COLOR_TYPE_GRAY, 0, 0},
1038     {&GUID_WICPixelFormat16bppGray, 16, 16, PNG_COLOR_TYPE_GRAY, 0, 0},
1039     {&GUID_WICPixelFormat32bppBGR, 32, 8, PNG_COLOR_TYPE_RGB, 1, 1},
1040     {&GUID_WICPixelFormat32bppBGRA, 32, 8, PNG_COLOR_TYPE_RGB_ALPHA, 0, 1},
1041     {&GUID_WICPixelFormat48bppRGB, 48, 16, PNG_COLOR_TYPE_RGB, 0, 0},
1042     {&GUID_WICPixelFormat64bppRGBA, 64, 16, PNG_COLOR_TYPE_RGB_ALPHA, 0, 0},
1043     {NULL},
1044 };
1045
1046 typedef struct PngEncoder {
1047     IWICBitmapEncoder IWICBitmapEncoder_iface;
1048     IWICBitmapFrameEncode IWICBitmapFrameEncode_iface;
1049     LONG ref;
1050     IStream *stream;
1051     png_structp png_ptr;
1052     png_infop info_ptr;
1053     UINT frame_count;
1054     BOOL frame_initialized;
1055     const struct png_pixelformat *format;
1056     BOOL info_written;
1057     UINT width, height;
1058     double xres, yres;
1059     UINT lines_written;
1060     BOOL frame_committed;
1061     BOOL committed;
1062     CRITICAL_SECTION lock;
1063 } PngEncoder;
1064
1065 static inline PngEncoder *impl_from_IWICBitmapEncoder(IWICBitmapEncoder *iface)
1066 {
1067     return CONTAINING_RECORD(iface, PngEncoder, IWICBitmapEncoder_iface);
1068 }
1069
1070 static inline PngEncoder *impl_from_IWICBitmapFrameEncode(IWICBitmapFrameEncode *iface)
1071 {
1072     return CONTAINING_RECORD(iface, PngEncoder, IWICBitmapFrameEncode_iface);
1073 }
1074
1075 static HRESULT WINAPI PngFrameEncode_QueryInterface(IWICBitmapFrameEncode *iface, REFIID iid,
1076     void **ppv)
1077 {
1078     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
1079     TRACE("(%p,%s,%p)\n", iface, debugstr_guid(iid), ppv);
1080
1081     if (!ppv) return E_INVALIDARG;
1082
1083     if (IsEqualIID(&IID_IUnknown, iid) ||
1084         IsEqualIID(&IID_IWICBitmapFrameEncode, iid))
1085     {
1086         *ppv = &This->IWICBitmapFrameEncode_iface;
1087     }
1088     else
1089     {
1090         *ppv = NULL;
1091         return E_NOINTERFACE;
1092     }
1093
1094     IUnknown_AddRef((IUnknown*)*ppv);
1095     return S_OK;
1096 }
1097
1098 static ULONG WINAPI PngFrameEncode_AddRef(IWICBitmapFrameEncode *iface)
1099 {
1100     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
1101     return IWICBitmapEncoder_AddRef(&This->IWICBitmapEncoder_iface);
1102 }
1103
1104 static ULONG WINAPI PngFrameEncode_Release(IWICBitmapFrameEncode *iface)
1105 {
1106     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
1107     return IWICBitmapEncoder_Release(&This->IWICBitmapEncoder_iface);
1108 }
1109
1110 static HRESULT WINAPI PngFrameEncode_Initialize(IWICBitmapFrameEncode *iface,
1111     IPropertyBag2 *pIEncoderOptions)
1112 {
1113     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
1114     TRACE("(%p,%p)\n", iface, pIEncoderOptions);
1115
1116     EnterCriticalSection(&This->lock);
1117
1118     if (This->frame_initialized)
1119     {
1120         LeaveCriticalSection(&This->lock);
1121         return WINCODEC_ERR_WRONGSTATE;
1122     }
1123
1124     This->frame_initialized = TRUE;
1125
1126     LeaveCriticalSection(&This->lock);
1127
1128     return S_OK;
1129 }
1130
1131 static HRESULT WINAPI PngFrameEncode_SetSize(IWICBitmapFrameEncode *iface,
1132     UINT uiWidth, UINT uiHeight)
1133 {
1134     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
1135     TRACE("(%p,%u,%u)\n", iface, uiWidth, uiHeight);
1136
1137     EnterCriticalSection(&This->lock);
1138
1139     if (!This->frame_initialized || This->info_written)
1140     {
1141         LeaveCriticalSection(&This->lock);
1142         return WINCODEC_ERR_WRONGSTATE;
1143     }
1144
1145     This->width = uiWidth;
1146     This->height = uiHeight;
1147
1148     LeaveCriticalSection(&This->lock);
1149
1150     return S_OK;
1151 }
1152
1153 static HRESULT WINAPI PngFrameEncode_SetResolution(IWICBitmapFrameEncode *iface,
1154     double dpiX, double dpiY)
1155 {
1156     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
1157     TRACE("(%p,%0.2f,%0.2f)\n", iface, dpiX, dpiY);
1158
1159     EnterCriticalSection(&This->lock);
1160
1161     if (!This->frame_initialized || This->info_written)
1162     {
1163         LeaveCriticalSection(&This->lock);
1164         return WINCODEC_ERR_WRONGSTATE;
1165     }
1166
1167     This->xres = dpiX;
1168     This->yres = dpiY;
1169
1170     LeaveCriticalSection(&This->lock);
1171
1172     return S_OK;
1173 }
1174
1175 static HRESULT WINAPI PngFrameEncode_SetPixelFormat(IWICBitmapFrameEncode *iface,
1176     WICPixelFormatGUID *pPixelFormat)
1177 {
1178     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
1179     int i;
1180     TRACE("(%p,%s)\n", iface, debugstr_guid(pPixelFormat));
1181
1182     EnterCriticalSection(&This->lock);
1183
1184     if (!This->frame_initialized || This->info_written)
1185     {
1186         LeaveCriticalSection(&This->lock);
1187         return WINCODEC_ERR_WRONGSTATE;
1188     }
1189
1190     for (i=0; formats[i].guid; i++)
1191     {
1192         if (memcmp(formats[i].guid, pPixelFormat, sizeof(GUID)) == 0)
1193             break;
1194     }
1195
1196     if (!formats[i].guid) i = 0;
1197
1198     This->format = &formats[i];
1199     memcpy(pPixelFormat, This->format->guid, sizeof(GUID));
1200
1201     LeaveCriticalSection(&This->lock);
1202
1203     return S_OK;
1204 }
1205
1206 static HRESULT WINAPI PngFrameEncode_SetColorContexts(IWICBitmapFrameEncode *iface,
1207     UINT cCount, IWICColorContext **ppIColorContext)
1208 {
1209     FIXME("(%p,%u,%p): stub\n", iface, cCount, ppIColorContext);
1210     return E_NOTIMPL;
1211 }
1212
1213 static HRESULT WINAPI PngFrameEncode_SetPalette(IWICBitmapFrameEncode *iface,
1214     IWICPalette *pIPalette)
1215 {
1216     FIXME("(%p,%p): stub\n", iface, pIPalette);
1217     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
1218 }
1219
1220 static HRESULT WINAPI PngFrameEncode_SetThumbnail(IWICBitmapFrameEncode *iface,
1221     IWICBitmapSource *pIThumbnail)
1222 {
1223     FIXME("(%p,%p): stub\n", iface, pIThumbnail);
1224     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
1225 }
1226
1227 static HRESULT WINAPI PngFrameEncode_WritePixels(IWICBitmapFrameEncode *iface,
1228     UINT lineCount, UINT cbStride, UINT cbBufferSize, BYTE *pbPixels)
1229 {
1230     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
1231     png_byte **row_pointers=NULL;
1232     UINT i;
1233     jmp_buf jmpbuf;
1234     TRACE("(%p,%u,%u,%u,%p)\n", iface, lineCount, cbStride, cbBufferSize, pbPixels);
1235
1236     EnterCriticalSection(&This->lock);
1237
1238     if (!This->frame_initialized || !This->width || !This->height || !This->format)
1239     {
1240         LeaveCriticalSection(&This->lock);
1241         return WINCODEC_ERR_WRONGSTATE;
1242     }
1243
1244     if (lineCount == 0 || lineCount + This->lines_written > This->height)
1245     {
1246         LeaveCriticalSection(&This->lock);
1247         return E_INVALIDARG;
1248     }
1249
1250     /* set up setjmp/longjmp error handling */
1251     if (setjmp(jmpbuf))
1252     {
1253         LeaveCriticalSection(&This->lock);
1254         HeapFree(GetProcessHeap(), 0, row_pointers);
1255         return E_FAIL;
1256     }
1257     ppng_set_error_fn(This->png_ptr, jmpbuf, user_error_fn, user_warning_fn);
1258
1259     if (!This->info_written)
1260     {
1261         ppng_set_IHDR(This->png_ptr, This->info_ptr, This->width, This->height,
1262             This->format->bit_depth, This->format->color_type, PNG_INTERLACE_NONE,
1263             PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
1264
1265         if (This->xres != 0.0 && This->yres != 0.0)
1266         {
1267             ppng_set_pHYs(This->png_ptr, This->info_ptr, (This->xres+0.0127) / 0.0254,
1268                 (This->yres+0.0127) / 0.0254, PNG_RESOLUTION_METER);
1269         }
1270
1271         ppng_write_info(This->png_ptr, This->info_ptr);
1272
1273         if (This->format->remove_filler)
1274             ppng_set_filler(This->png_ptr, 0, PNG_FILLER_AFTER);
1275
1276         if (This->format->swap_rgb)
1277             ppng_set_bgr(This->png_ptr);
1278
1279         This->info_written = TRUE;
1280     }
1281
1282     row_pointers = HeapAlloc(GetProcessHeap(), 0, lineCount * sizeof(png_byte*));
1283     if (!row_pointers)
1284     {
1285         LeaveCriticalSection(&This->lock);
1286         return E_OUTOFMEMORY;
1287     }
1288
1289     for (i=0; i<lineCount; i++)
1290         row_pointers[i] = pbPixels + cbStride * i;
1291
1292     ppng_write_rows(This->png_ptr, row_pointers, lineCount);
1293     This->lines_written += lineCount;
1294
1295     LeaveCriticalSection(&This->lock);
1296
1297     HeapFree(GetProcessHeap(), 0, row_pointers);
1298
1299     return S_OK;
1300 }
1301
1302 static HRESULT WINAPI PngFrameEncode_WriteSource(IWICBitmapFrameEncode *iface,
1303     IWICBitmapSource *pIBitmapSource, WICRect *prc)
1304 {
1305     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
1306     HRESULT hr;
1307     WICRect rc;
1308     WICPixelFormatGUID guid;
1309     UINT stride;
1310     BYTE *pixeldata;
1311     TRACE("(%p,%p,%p)\n", iface, pIBitmapSource, prc);
1312
1313     if (!This->frame_initialized || !This->width || !This->height)
1314         return WINCODEC_ERR_WRONGSTATE;
1315
1316     if (!This->format)
1317     {
1318         hr = IWICBitmapSource_GetPixelFormat(pIBitmapSource, &guid);
1319         if (FAILED(hr)) return hr;
1320         hr = IWICBitmapFrameEncode_SetPixelFormat(iface, &guid);
1321         if (FAILED(hr)) return hr;
1322     }
1323
1324     hr = IWICBitmapSource_GetPixelFormat(pIBitmapSource, &guid);
1325     if (FAILED(hr)) return hr;
1326     if (memcmp(&guid, This->format->guid, sizeof(GUID)) != 0)
1327     {
1328         /* FIXME: should use WICConvertBitmapSource to convert */
1329         ERR("format %s unsupported\n", debugstr_guid(&guid));
1330         return E_FAIL;
1331     }
1332
1333     if (This->xres == 0.0 || This->yres == 0.0)
1334     {
1335         double xres, yres;
1336         hr = IWICBitmapSource_GetResolution(pIBitmapSource, &xres, &yres);
1337         if (FAILED(hr)) return hr;
1338         hr = IWICBitmapFrameEncode_SetResolution(iface, xres, yres);
1339         if (FAILED(hr)) return hr;
1340     }
1341
1342     if (!prc)
1343     {
1344         UINT width, height;
1345         hr = IWICBitmapSource_GetSize(pIBitmapSource, &width, &height);
1346         if (FAILED(hr)) return hr;
1347         rc.X = 0;
1348         rc.Y = 0;
1349         rc.Width = width;
1350         rc.Height = height;
1351         prc = &rc;
1352     }
1353
1354     if (prc->Width != This->width) return E_INVALIDARG;
1355
1356     stride = (This->format->bpp * This->width + 7)/8;
1357
1358     pixeldata = HeapAlloc(GetProcessHeap(), 0, stride * prc->Height);
1359     if (!pixeldata) return E_OUTOFMEMORY;
1360
1361     hr = IWICBitmapSource_CopyPixels(pIBitmapSource, prc, stride,
1362         stride*prc->Height, pixeldata);
1363
1364     if (SUCCEEDED(hr))
1365     {
1366         hr = IWICBitmapFrameEncode_WritePixels(iface, prc->Height, stride,
1367             stride*prc->Height, pixeldata);
1368     }
1369
1370     HeapFree(GetProcessHeap(), 0, pixeldata);
1371
1372     return hr;
1373 }
1374
1375 static HRESULT WINAPI PngFrameEncode_Commit(IWICBitmapFrameEncode *iface)
1376 {
1377     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
1378     jmp_buf jmpbuf;
1379     TRACE("(%p)\n", iface);
1380
1381     EnterCriticalSection(&This->lock);
1382
1383     if (!This->info_written || This->lines_written != This->height || This->frame_committed)
1384     {
1385         LeaveCriticalSection(&This->lock);
1386         return WINCODEC_ERR_WRONGSTATE;
1387     }
1388
1389     /* set up setjmp/longjmp error handling */
1390     if (setjmp(jmpbuf))
1391     {
1392         LeaveCriticalSection(&This->lock);
1393         return E_FAIL;
1394     }
1395     ppng_set_error_fn(This->png_ptr, jmpbuf, user_error_fn, user_warning_fn);
1396
1397     ppng_write_end(This->png_ptr, This->info_ptr);
1398
1399     This->frame_committed = TRUE;
1400
1401     LeaveCriticalSection(&This->lock);
1402
1403     return S_OK;
1404 }
1405
1406 static HRESULT WINAPI PngFrameEncode_GetMetadataQueryWriter(IWICBitmapFrameEncode *iface,
1407     IWICMetadataQueryWriter **ppIMetadataQueryWriter)
1408 {
1409     FIXME("(%p, %p): stub\n", iface, ppIMetadataQueryWriter);
1410     return E_NOTIMPL;
1411 }
1412
1413 static const IWICBitmapFrameEncodeVtbl PngEncoder_FrameVtbl = {
1414     PngFrameEncode_QueryInterface,
1415     PngFrameEncode_AddRef,
1416     PngFrameEncode_Release,
1417     PngFrameEncode_Initialize,
1418     PngFrameEncode_SetSize,
1419     PngFrameEncode_SetResolution,
1420     PngFrameEncode_SetPixelFormat,
1421     PngFrameEncode_SetColorContexts,
1422     PngFrameEncode_SetPalette,
1423     PngFrameEncode_SetThumbnail,
1424     PngFrameEncode_WritePixels,
1425     PngFrameEncode_WriteSource,
1426     PngFrameEncode_Commit,
1427     PngFrameEncode_GetMetadataQueryWriter
1428 };
1429
1430 static HRESULT WINAPI PngEncoder_QueryInterface(IWICBitmapEncoder *iface, REFIID iid,
1431     void **ppv)
1432 {
1433     PngEncoder *This = impl_from_IWICBitmapEncoder(iface);
1434     TRACE("(%p,%s,%p)\n", iface, debugstr_guid(iid), ppv);
1435
1436     if (!ppv) return E_INVALIDARG;
1437
1438     if (IsEqualIID(&IID_IUnknown, iid) ||
1439         IsEqualIID(&IID_IWICBitmapEncoder, iid))
1440     {
1441         *ppv = &This->IWICBitmapEncoder_iface;
1442     }
1443     else
1444     {
1445         *ppv = NULL;
1446         return E_NOINTERFACE;
1447     }
1448
1449     IUnknown_AddRef((IUnknown*)*ppv);
1450     return S_OK;
1451 }
1452
1453 static ULONG WINAPI PngEncoder_AddRef(IWICBitmapEncoder *iface)
1454 {
1455     PngEncoder *This = impl_from_IWICBitmapEncoder(iface);
1456     ULONG ref = InterlockedIncrement(&This->ref);
1457
1458     TRACE("(%p) refcount=%u\n", iface, ref);
1459
1460     return ref;
1461 }
1462
1463 static ULONG WINAPI PngEncoder_Release(IWICBitmapEncoder *iface)
1464 {
1465     PngEncoder *This = impl_from_IWICBitmapEncoder(iface);
1466     ULONG ref = InterlockedDecrement(&This->ref);
1467
1468     TRACE("(%p) refcount=%u\n", iface, ref);
1469
1470     if (ref == 0)
1471     {
1472         This->lock.DebugInfo->Spare[0] = 0;
1473         DeleteCriticalSection(&This->lock);
1474         if (This->png_ptr)
1475             ppng_destroy_write_struct(&This->png_ptr, &This->info_ptr);
1476         if (This->stream)
1477             IStream_Release(This->stream);
1478         HeapFree(GetProcessHeap(), 0, This);
1479     }
1480
1481     return ref;
1482 }
1483
1484 static void user_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
1485 {
1486     PngEncoder *This = ppng_get_io_ptr(png_ptr);
1487     HRESULT hr;
1488     ULONG byteswritten;
1489
1490     hr = IStream_Write(This->stream, data, length, &byteswritten);
1491     if (FAILED(hr) || byteswritten != length)
1492     {
1493         ppng_error(png_ptr, "failed writing data");
1494     }
1495 }
1496
1497 static void user_flush(png_structp png_ptr)
1498 {
1499 }
1500
1501 static HRESULT WINAPI PngEncoder_Initialize(IWICBitmapEncoder *iface,
1502     IStream *pIStream, WICBitmapEncoderCacheOption cacheOption)
1503 {
1504     PngEncoder *This = impl_from_IWICBitmapEncoder(iface);
1505     jmp_buf jmpbuf;
1506
1507     TRACE("(%p,%p,%u)\n", iface, pIStream, cacheOption);
1508
1509     EnterCriticalSection(&This->lock);
1510
1511     if (This->png_ptr)
1512     {
1513         LeaveCriticalSection(&This->lock);
1514         return WINCODEC_ERR_WRONGSTATE;
1515     }
1516
1517     /* initialize libpng */
1518     This->png_ptr = ppng_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
1519     if (!This->png_ptr)
1520     {
1521         LeaveCriticalSection(&This->lock);
1522         return E_FAIL;
1523     }
1524
1525     This->info_ptr = ppng_create_info_struct(This->png_ptr);
1526     if (!This->info_ptr)
1527     {
1528         ppng_destroy_write_struct(&This->png_ptr, NULL);
1529         This->png_ptr = NULL;
1530         LeaveCriticalSection(&This->lock);
1531         return E_FAIL;
1532     }
1533
1534     IStream_AddRef(pIStream);
1535     This->stream = pIStream;
1536
1537     /* set up setjmp/longjmp error handling */
1538     if (setjmp(jmpbuf))
1539     {
1540         ppng_destroy_write_struct(&This->png_ptr, &This->info_ptr);
1541         This->png_ptr = NULL;
1542         IStream_Release(This->stream);
1543         This->stream = NULL;
1544         LeaveCriticalSection(&This->lock);
1545         return E_FAIL;
1546     }
1547     ppng_set_error_fn(This->png_ptr, jmpbuf, user_error_fn, user_warning_fn);
1548
1549     /* set up custom i/o handling */
1550     ppng_set_write_fn(This->png_ptr, This, user_write_data, user_flush);
1551
1552     LeaveCriticalSection(&This->lock);
1553
1554     return S_OK;
1555 }
1556
1557 static HRESULT WINAPI PngEncoder_GetContainerFormat(IWICBitmapEncoder *iface,
1558     GUID *pguidContainerFormat)
1559 {
1560     FIXME("(%p,%s): stub\n", iface, debugstr_guid(pguidContainerFormat));
1561     return E_NOTIMPL;
1562 }
1563
1564 static HRESULT WINAPI PngEncoder_GetEncoderInfo(IWICBitmapEncoder *iface,
1565     IWICBitmapEncoderInfo **ppIEncoderInfo)
1566 {
1567     FIXME("(%p,%p): stub\n", iface, ppIEncoderInfo);
1568     return E_NOTIMPL;
1569 }
1570
1571 static HRESULT WINAPI PngEncoder_SetColorContexts(IWICBitmapEncoder *iface,
1572     UINT cCount, IWICColorContext **ppIColorContext)
1573 {
1574     FIXME("(%p,%u,%p): stub\n", iface, cCount, ppIColorContext);
1575     return E_NOTIMPL;
1576 }
1577
1578 static HRESULT WINAPI PngEncoder_SetPalette(IWICBitmapEncoder *iface, IWICPalette *pIPalette)
1579 {
1580     TRACE("(%p,%p)\n", iface, pIPalette);
1581     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
1582 }
1583
1584 static HRESULT WINAPI PngEncoder_SetThumbnail(IWICBitmapEncoder *iface, IWICBitmapSource *pIThumbnail)
1585 {
1586     TRACE("(%p,%p)\n", iface, pIThumbnail);
1587     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
1588 }
1589
1590 static HRESULT WINAPI PngEncoder_SetPreview(IWICBitmapEncoder *iface, IWICBitmapSource *pIPreview)
1591 {
1592     TRACE("(%p,%p)\n", iface, pIPreview);
1593     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
1594 }
1595
1596 static HRESULT WINAPI PngEncoder_CreateNewFrame(IWICBitmapEncoder *iface,
1597     IWICBitmapFrameEncode **ppIFrameEncode, IPropertyBag2 **ppIEncoderOptions)
1598 {
1599     PngEncoder *This = impl_from_IWICBitmapEncoder(iface);
1600     HRESULT hr;
1601     TRACE("(%p,%p,%p)\n", iface, ppIFrameEncode, ppIEncoderOptions);
1602
1603     EnterCriticalSection(&This->lock);
1604
1605     if (This->frame_count != 0)
1606     {
1607         LeaveCriticalSection(&This->lock);
1608         return WINCODEC_ERR_UNSUPPORTEDOPERATION;
1609     }
1610
1611     if (!This->stream)
1612     {
1613         LeaveCriticalSection(&This->lock);
1614         return WINCODEC_ERR_NOTINITIALIZED;
1615     }
1616
1617     hr = CreatePropertyBag2(NULL, 0, ppIEncoderOptions);
1618     if (FAILED(hr))
1619     {
1620         LeaveCriticalSection(&This->lock);
1621         return hr;
1622     }
1623
1624     This->frame_count = 1;
1625
1626     LeaveCriticalSection(&This->lock);
1627
1628     IWICBitmapEncoder_AddRef(iface);
1629     *ppIFrameEncode = &This->IWICBitmapFrameEncode_iface;
1630
1631     return S_OK;
1632 }
1633
1634 static HRESULT WINAPI PngEncoder_Commit(IWICBitmapEncoder *iface)
1635 {
1636     PngEncoder *This = impl_from_IWICBitmapEncoder(iface);
1637     TRACE("(%p)\n", iface);
1638
1639     EnterCriticalSection(&This->lock);
1640
1641     if (!This->frame_committed || This->committed)
1642     {
1643         LeaveCriticalSection(&This->lock);
1644         return WINCODEC_ERR_WRONGSTATE;
1645     }
1646
1647     This->committed = TRUE;
1648
1649     LeaveCriticalSection(&This->lock);
1650
1651     return S_OK;
1652 }
1653
1654 static HRESULT WINAPI PngEncoder_GetMetadataQueryWriter(IWICBitmapEncoder *iface,
1655     IWICMetadataQueryWriter **ppIMetadataQueryWriter)
1656 {
1657     FIXME("(%p,%p): stub\n", iface, ppIMetadataQueryWriter);
1658     return E_NOTIMPL;
1659 }
1660
1661 static const IWICBitmapEncoderVtbl PngEncoder_Vtbl = {
1662     PngEncoder_QueryInterface,
1663     PngEncoder_AddRef,
1664     PngEncoder_Release,
1665     PngEncoder_Initialize,
1666     PngEncoder_GetContainerFormat,
1667     PngEncoder_GetEncoderInfo,
1668     PngEncoder_SetColorContexts,
1669     PngEncoder_SetPalette,
1670     PngEncoder_SetThumbnail,
1671     PngEncoder_SetPreview,
1672     PngEncoder_CreateNewFrame,
1673     PngEncoder_Commit,
1674     PngEncoder_GetMetadataQueryWriter
1675 };
1676
1677 HRESULT PngEncoder_CreateInstance(REFIID iid, void** ppv)
1678 {
1679     PngEncoder *This;
1680     HRESULT ret;
1681
1682     TRACE("(%s,%p)\n", debugstr_guid(iid), ppv);
1683
1684     *ppv = NULL;
1685
1686     if (!libpng_handle && !load_libpng())
1687     {
1688         ERR("Failed writing PNG because unable to find %s\n",SONAME_LIBPNG);
1689         return E_FAIL;
1690     }
1691
1692     This = HeapAlloc(GetProcessHeap(), 0, sizeof(PngEncoder));
1693     if (!This) return E_OUTOFMEMORY;
1694
1695     This->IWICBitmapEncoder_iface.lpVtbl = &PngEncoder_Vtbl;
1696     This->IWICBitmapFrameEncode_iface.lpVtbl = &PngEncoder_FrameVtbl;
1697     This->ref = 1;
1698     This->png_ptr = NULL;
1699     This->info_ptr = NULL;
1700     This->stream = NULL;
1701     This->frame_count = 0;
1702     This->frame_initialized = FALSE;
1703     This->format = NULL;
1704     This->info_written = FALSE;
1705     This->width = 0;
1706     This->height = 0;
1707     This->xres = 0.0;
1708     This->yres = 0.0;
1709     This->lines_written = 0;
1710     This->frame_committed = FALSE;
1711     This->committed = FALSE;
1712     InitializeCriticalSection(&This->lock);
1713     This->lock.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": PngEncoder.lock");
1714
1715     ret = IWICBitmapEncoder_QueryInterface(&This->IWICBitmapEncoder_iface, iid, ppv);
1716     IWICBitmapEncoder_Release(&This->IWICBitmapEncoder_iface);
1717
1718     return ret;
1719 }
1720
1721 #else /* !HAVE_PNG_H */
1722
1723 HRESULT PngDecoder_CreateInstance(REFIID iid, void** ppv)
1724 {
1725     ERR("Trying to load PNG picture, but PNG support is not compiled in.\n");
1726     return E_FAIL;
1727 }
1728
1729 HRESULT PngEncoder_CreateInstance(REFIID iid, void** ppv)
1730 {
1731     ERR("Trying to save PNG picture, but PNG support is not compiled in.\n");
1732     return E_FAIL;
1733 }
1734
1735 #endif