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dwrite: Rework Analyze() to make it easier to extend. 

Signed-off-by: Nikolay Sivov <nsivov@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Nikolay Sivov 2016-02-05 03:09:43 +03:00 committed by Alexandre Julliard
parent 33610da6b4
commit 076b35362a
1 changed files with 89 additions and 32 deletions
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121
dlls/dwrite/opentype.c
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@ -715,50 +715,107 @@ BOOL is_face_type_supported(DWRITE_FONT_FACE_TYPE type)
(type == DWRITE_FONT_FACE_TYPE_RAW_CFF);
}
HRESULT opentype_analyze_font(IDWriteFontFileStream *stream, UINT32* font_count, DWRITE_FONT_FILE_TYPE *file_type, DWRITE_FONT_FACE_TYPE *face_type, BOOL *supported)
typedef HRESULT (*dwrite_fontfile_analyzer)(IDWriteFontFileStream *stream, UINT32 *font_count, DWRITE_FONT_FILE_TYPE *file_type,
DWRITE_FONT_FACE_TYPE *face_type);
static HRESULT opentype_ttc_analyzer(IDWriteFontFileStream *stream, UINT32 *font_count, DWRITE_FONT_FILE_TYPE *file_type,
DWRITE_FONT_FACE_TYPE *face_type)
{
/* TODO: Do font validation */
DWRITE_FONT_FACE_TYPE face;
const void *font_data;
const char* tag;
static const DWORD ttctag = MS_TTCF_TAG;
const TTC_Header_V1 *header;
void *context;
HRESULT hr;
hr = IDWriteFontFileStream_ReadFileFragment(stream, &font_data, 0, sizeof(TTC_Header_V1), &context);
hr = IDWriteFontFileStream_ReadFileFragment(stream, (const void**)&header, 0, sizeof(header), &context);
if (FAILED(hr))
return hr;
tag = font_data;
*file_type = DWRITE_FONT_FILE_TYPE_UNKNOWN;
face = DWRITE_FONT_FACE_TYPE_UNKNOWN;
*font_count = 0;
if (DWRITE_MAKE_OPENTYPE_TAG(tag[0], tag[1], tag[2], tag[3]) == MS_TTCF_TAG)
{
const TTC_Header_V1 *header = font_data;
if (!memcmp(header->TTCTag, &ttctag, sizeof(ttctag))) {
*font_count = GET_BE_DWORD(header->numFonts);
*file_type = DWRITE_FONT_FILE_TYPE_TRUETYPE_COLLECTION;
face = DWRITE_FONT_FACE_TYPE_TRUETYPE_COLLECTION;
*face_type = DWRITE_FONT_FACE_TYPE_TRUETYPE_COLLECTION;
}
else if (GET_BE_DWORD(*(DWORD*)font_data) == 0x10000)
{
*font_count = 1;
*file_type = DWRITE_FONT_FILE_TYPE_TRUETYPE;
face = DWRITE_FONT_FACE_TYPE_TRUETYPE;
}
else if (DWRITE_MAKE_OPENTYPE_TAG(tag[0], tag[1], tag[2], tag[3]) == MS_OTTO_TAG)
{
*font_count = 1;
*file_type = DWRITE_FONT_FILE_TYPE_CFF;
face = DWRITE_FONT_FACE_TYPE_CFF;
}
if (face_type)
*face_type = face;
*supported = is_face_type_supported(face);
IDWriteFontFileStream_ReleaseFileFragment(stream, context);
return *file_type != DWRITE_FONT_FILE_TYPE_UNKNOWN ? S_OK : S_FALSE;
}
static HRESULT opentype_ttf_analyzer(IDWriteFontFileStream *stream, UINT32 *font_count, DWRITE_FONT_FILE_TYPE *file_type,
DWRITE_FONT_FACE_TYPE *face_type)
{
const DWORD *header;
void *context;
HRESULT hr;
hr = IDWriteFontFileStream_ReadFileFragment(stream, (const void**)&header, 0, sizeof(*header), &context);
if (FAILED(hr))
return hr;
if (GET_BE_DWORD(*header) == 0x10000) {
*font_count = 1;
*file_type = DWRITE_FONT_FILE_TYPE_TRUETYPE;
*face_type = DWRITE_FONT_FACE_TYPE_TRUETYPE;
}
IDWriteFontFileStream_ReleaseFileFragment(stream, context);
return *file_type != DWRITE_FONT_FILE_TYPE_UNKNOWN ? S_OK : S_FALSE;
}
static HRESULT opentype_otf_analyzer(IDWriteFontFileStream *stream, UINT32 *font_count, DWRITE_FONT_FILE_TYPE *file_type,
DWRITE_FONT_FACE_TYPE *face_type)
{
const DWORD *header;
void *context;
HRESULT hr;
hr = IDWriteFontFileStream_ReadFileFragment(stream, (const void**)&header, 0, sizeof(*header), &context);
if (FAILED(hr))
return hr;
if (GET_BE_DWORD(*header) == MS_OTTO_TAG) {
*font_count = 1;
*file_type = DWRITE_FONT_FILE_TYPE_CFF;
*face_type = DWRITE_FONT_FACE_TYPE_CFF;
}
IDWriteFontFileStream_ReleaseFileFragment(stream, context);
return *file_type != DWRITE_FONT_FILE_TYPE_UNKNOWN ? S_OK : S_FALSE;
}
HRESULT opentype_analyze_font(IDWriteFontFileStream *stream, UINT32* font_count, DWRITE_FONT_FILE_TYPE *file_type, DWRITE_FONT_FACE_TYPE *face_type, BOOL *supported)
{
static dwrite_fontfile_analyzer fontfile_analyzers[] = {
opentype_ttf_analyzer,
opentype_otf_analyzer,
opentype_ttc_analyzer,
NULL
};
dwrite_fontfile_analyzer *analyzer = fontfile_analyzers;
DWRITE_FONT_FACE_TYPE face;
HRESULT hr;
if (!face_type)
face_type = &face;
*file_type = DWRITE_FONT_FILE_TYPE_UNKNOWN;
*face_type = DWRITE_FONT_FACE_TYPE_UNKNOWN;
*font_count = 0;
while (*analyzer) {
hr = (*analyzer)(stream, font_count, file_type, face_type);
if (FAILED(hr))
return hr;
if (hr == S_OK)
break;
analyzer++;
}
*supported = is_face_type_supported(*face_type);
return S_OK;
}