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gdi32: Store the original emf as a sequence of MFCOMMENT records.

This commit is contained in:
Huw Davies 2009-06-29 16:06:40 +01:00 committed by Alexandre Julliard
parent db6a9e6f75
commit 41bbc007a4
1 changed files with 90 additions and 1 deletions
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91
dlls/gdi32/metafile.c
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@ -1147,6 +1147,81 @@ UINT WINAPI GetMetaFileBitsEx( HMETAFILE hmf, UINT nSize, LPVOID buf )
return mfSize;
}
#include <pshpack2.h>
typedef struct
{
DWORD magic; /* WMFC */
WORD unk04; /* 1 */
WORD unk06; /* 0 */
WORD unk08; /* 0 */
WORD unk0a; /* 1 */
WORD checksum;
DWORD unk0e; /* 0 */
DWORD num_chunks;
DWORD chunk_size;
DWORD remaining_size;
DWORD emf_size;
BYTE *emf_data;
} mf_comment_chunk;
#include <poppack.h>
static const DWORD wmfc_magic = 0x43464d57;
/******************************************************************
* add_mf_comment
*
* Helper for GetWinMetaFileBits
*
* Add the MFCOMMENT record[s] which is essentially a copy
* of the original emf.
*/
static BOOL add_mf_comment(HDC hdc, HENHMETAFILE emf)
{
DWORD size = GetEnhMetaFileBits(emf, 0, NULL), i;
BYTE *bits, *chunk_data;
mf_comment_chunk *chunk = NULL;
BOOL ret = FALSE;
static const DWORD max_chunk_size = 0x2000;
if(!size) return FALSE;
chunk_data = bits = HeapAlloc(GetProcessHeap(), 0, size);
if(!bits) return FALSE;
if(!GetEnhMetaFileBits(emf, size, bits)) goto end;
chunk = HeapAlloc(GetProcessHeap(), 0, max_chunk_size + FIELD_OFFSET(mf_comment_chunk, emf_data));
if(!chunk) goto end;
chunk->magic = wmfc_magic;
chunk->unk04 = 1;
chunk->unk06 = 0;
chunk->unk08 = 0;
chunk->unk0a = 1;
chunk->checksum = 0; /* We fixup the first chunk's checksum before returning from GetWinMetaFileBits */
chunk->unk0e = 0;
chunk->num_chunks = (size + max_chunk_size - 1) / max_chunk_size;
chunk->chunk_size = max_chunk_size;
chunk->remaining_size = size;
chunk->emf_size = size;
for(i = 0; i < chunk->num_chunks; i++)
{
if(i == chunk->num_chunks - 1) /* last chunk */
chunk->chunk_size = chunk->remaining_size;
chunk->remaining_size -= chunk->chunk_size;
memcpy(&chunk->emf_data, chunk_data, chunk->chunk_size);
chunk_data += chunk->chunk_size;
if(!Escape(hdc, MFCOMMENT, chunk->chunk_size + FIELD_OFFSET(mf_comment_chunk, emf_data), (char*)chunk, NULL))
goto end;
}
ret = TRUE;
end:
HeapFree(GetProcessHeap(), 0, chunk);
HeapFree(GetProcessHeap(), 0, bits);
return ret;
}
/******************************************************************
* GetWinMetaFileBits [GDI32.@]
*/
@ -1156,7 +1231,7 @@ UINT WINAPI GetWinMetaFileBits(HENHMETAFILE hemf,
{
HDC hdcmf;
HMETAFILE hmf;
UINT ret;
UINT ret, full_size;
RECT rc;
GetClipBox(hdcRef, &rc);
@ -1165,11 +1240,25 @@ UINT WINAPI GetWinMetaFileBits(HENHMETAFILE hemf,
fnMapMode, hdcRef, wine_dbgstr_rect(&rc));
hdcmf = CreateMetaFileW(NULL);
add_mf_comment(hdcmf, hemf);
PlayEnhMetaFile(hdcmf, hemf, &rc);
hmf = CloseMetaFile(hdcmf);
full_size = GetMetaFileBitsEx(hmf, 0, NULL);
ret = GetMetaFileBitsEx(hmf, cbBuffer, lpbBuffer);
DeleteMetaFile(hmf);
if(ret && ret == full_size && lpbBuffer) /* fixup checksum, but only if retrieving all of the bits */
{
WORD checksum = 0;
METARECORD *comment_rec = (METARECORD*)(lpbBuffer + sizeof(METAHEADER));
UINT i;
for(i = 0; i < full_size / 2; i++)
checksum += ((WORD*)lpbBuffer)[i];
comment_rec->rdParm[8] = ~checksum + 1;
}
return ret;
}