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dwrite: Added a helper to get source text pointer.

This commit is contained in:
Nikolay Sivov 2015-04-21 13:36:01 +03:00 committed by Alexandre Julliard
parent 6e4ad78ff4
commit e0403efc21
1 changed files with 58 additions and 35 deletions
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93
dlls/dwrite/analyzer.c
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@ -676,19 +676,66 @@ static ULONG WINAPI dwritetextanalyzer_Release(IDWriteTextAnalyzer2 *iface)
return 1;
}
static HRESULT WINAPI dwritetextanalyzer_AnalyzeScript(IDWriteTextAnalyzer2 *iface,
IDWriteTextAnalysisSource* source, UINT32 position, UINT32 length, IDWriteTextAnalysisSink* sink)
/* This helper tries to get 'length' chars from a source, allocating a buffer only if source failed to provide enough
data after a first request. */
static HRESULT get_text_source_ptr(IDWriteTextAnalysisSource *source, UINT32 position, UINT32 length, const WCHAR **text, WCHAR **buff)
{
const WCHAR *text;
HRESULT hr;
UINT32 len;
TRACE("(%p %u %u %p)\n", source, position, length, sink);
hr = IDWriteTextAnalysisSource_GetTextAtPosition(source, position, &text, &len);
*buff = NULL;
*text = NULL;
len = 0;
hr = IDWriteTextAnalysisSource_GetTextAtPosition(source, position, text, &len);
if (FAILED(hr)) return hr;
return analyze_script(text, len, sink);
if (len < length) {
UINT32 read;
*buff = heap_alloc(length*sizeof(WCHAR));
if (!*buff)
return E_OUTOFMEMORY;
memcpy(*buff, *text, len*sizeof(WCHAR));
read = len;
while (read < length && *text) {
*text = NULL;
len = 0;
hr = IDWriteTextAnalysisSource_GetTextAtPosition(source, read, text, &len);
if (FAILED(hr)) {
heap_free(*buff);
return hr;
}
memcpy(*buff + read, *text, min(len, length-read)*sizeof(WCHAR));
read += len;
}
*text = *buff;
}
return hr;
}
static HRESULT WINAPI dwritetextanalyzer_AnalyzeScript(IDWriteTextAnalyzer2 *iface,
IDWriteTextAnalysisSource* source, UINT32 position, UINT32 length, IDWriteTextAnalysisSink* sink)
{
WCHAR *buff = NULL;
const WCHAR *text;
HRESULT hr;
TRACE("(%p %u %u %p)\n", source, position, length, sink);
if (length == 0)
return S_OK;
hr = get_text_source_ptr(source, position, length, &text, &buff);
if (FAILED(hr))
return hr;
hr = analyze_script(text, length, sink);
heap_free(buff);
return hr;
}
static HRESULT WINAPI dwritetextanalyzer_AnalyzeBidi(IDWriteTextAnalyzer2 *iface,
@ -698,7 +745,7 @@ static HRESULT WINAPI dwritetextanalyzer_AnalyzeBidi(IDWriteTextAnalyzer2 *iface
UINT8 baselevel, level, explicit_level;
WCHAR *buff = NULL;
const WCHAR *text;
UINT32 len, pos, i;
UINT32 pos, i;
HRESULT hr;
TRACE("(%p %u %u %p)\n", source, position, length, sink);
@ -706,33 +753,9 @@ static HRESULT WINAPI dwritetextanalyzer_AnalyzeBidi(IDWriteTextAnalyzer2 *iface
if (length == 0)
return S_OK;
/* get some, check for length */
text = NULL;
len = 0;
hr = IDWriteTextAnalysisSource_GetTextAtPosition(source, position, &text, &len);
if (FAILED(hr)) return hr;
if (len < length) {
UINT32 read;
buff = heap_alloc(length*sizeof(WCHAR));
if (!buff)
return E_OUTOFMEMORY;
memcpy(buff, text, len*sizeof(WCHAR));
read = len;
while (read < length && text) {
text = NULL;
len = 0;
hr = IDWriteTextAnalysisSource_GetTextAtPosition(source, read, &text, &len);
if (FAILED(hr))
goto done;
memcpy(&buff[read], text, min(len, length-read)*sizeof(WCHAR));
read += len;
}
text = buff;
}
hr = get_text_source_ptr(source, position, length, &text, &buff);
if (FAILED(hr))
return hr;
levels = heap_alloc(length*sizeof(*levels));
explicit = heap_alloc(length*sizeof(*explicit));