// Run modification.
TextAnalysis::LinkedRun& TextAnalysis::FetchNextRun(
_Inout_ UINT32* textLength
)
{
// Used by the sink setters, this returns a reference to the next run.
// Position and length are adjusted to now point after the current run
// being returned.
UINT32 runIndex = m_currentRunIndex;
UINT32 runTextLength = m_runs[m_currentRunIndex].textLength;
// Split the tail if needed (the length remaining is less than the
// current run's size).
if (*textLength < runTextLength)
{
runTextLength = *textLength; // Limit to what's actually left.
UINT32 runTextStart = m_runs[m_currentRunIndex].textStart;
SplitCurrentRun(runTextStart + runTextLength);
}
else
{
// Just advance the current run.
m_currentRunIndex = m_runs[m_currentRunIndex].nextRunIndex;
}
*textLength -= runTextLength;
// Return a reference to the run that was just current.
return m_runs[runIndex];
}
IFACEMETHODIMP TextAnalysis::SetBidiLevel(
UINT32 textPosition,
UINT32 textLength,
UINT8 explicitLevel,
UINT8 resolvedLevel
)
{
try
{
SetCurrentRun(textPosition);
SplitCurrentRun(textPosition);
while (textLength > 0)
{
LinkedRun& run = FetchNextRun(&textLength);
run.bidiLevel = resolvedLevel;
run.isReversed = !!(resolvedLevel & 1);
}
}
catch (...)
{
return E_FAIL; // Unknown error, probably out of memory.
}
return S_OK;
}
IFACEMETHODIMP
TextAnalysis::SetScriptAnalysis(UINT32 textPosition,
UINT32 textLength,
DWRITE_SCRIPT_ANALYSIS const* scriptAnalysis)
{
SetCurrentRun(textPosition);
SplitCurrentRun(textPosition);
while (textLength > 0) {
Run *run = FetchNextRun(&textLength);
run->mScript = *scriptAnalysis;
}
return S_OK;
}
IFACEMETHODIMP
TextAnalysis::SetBidiLevel(UINT32 textPosition,
UINT32 textLength,
UINT8 explicitLevel,
UINT8 resolvedLevel)
{
SetCurrentRun(textPosition);
SplitCurrentRun(textPosition);
while (textLength > 0) {
Run *run = FetchNextRun(&textLength);
run->mBidiLevel = resolvedLevel;
}
return S_OK;
}
TextAnalysis::Run *
TextAnalysis::FetchNextRun(IN OUT UINT32* textLength)
{
// Used by the sink setters, this returns a reference to the next run.
// Position and length are adjusted to now point after the current run
// being returned.
Run *origRun = mCurrentRun;
// Split the tail if needed (the length remaining is less than the
// current run's size).
if (*textLength < mCurrentRun->mTextLength) {
SplitCurrentRun(mCurrentRun->mTextStart + *textLength);
} else {
// Just advance the current run.
mCurrentRun = mCurrentRun->nextRun;
}
*textLength -= origRun->mTextLength;
// Return a reference to the run that was just current.
return origRun;
}
IFACEMETHODIMP TextAnalysis::SetNumberSubstitution(
UINT32 textPosition,
UINT32 textLength,
IDWriteNumberSubstitution* numberSubstitution
)
{
try
{
SetCurrentRun(textPosition);
SplitCurrentRun(textPosition);
while (textLength > 0)
{
LinkedRun& run = FetchNextRun(&textLength);
run.isNumberSubstituted = (numberSubstitution != nullptr);
}
}
catch (...)
{
return E_FAIL; // Unknown error, probably out of memory.
}
return S_OK;
}
IFACEMETHODIMP TextAnalysis::SetScriptAnalysis(
UINT32 textPosition,
UINT32 textLength,
DWRITE_SCRIPT_ANALYSIS const* scriptAnalysis
)
{
try
{
SetCurrentRun(textPosition);
SplitCurrentRun(textPosition);
while (textLength > 0)
{
LinkedRun& run = FetchNextRun(&textLength);
run.script = *scriptAnalysis;
}
}
catch (...)
{
return E_FAIL; // Unknown error, probably out of memory.
}
return S_OK;
}
IFACEMETHODIMP TextAnalysis::SetGlyphOrientation(
UINT32 textPosition,
UINT32 textLength,
DWRITE_GLYPH_ORIENTATION_ANGLE glyphOrientationAngle,
UINT8 adjustedBidiLevel,
BOOL isSideways,
BOOL isRightToLeft
)
{
try
{
// Mapping from angle down to small orientation.
const static UINT8 glyphOrientations[] = {
GlyphOrientationCW0,
GlyphOrientationCW90,
GlyphOrientationCW180,
GlyphOrientationCW270,
};
SetCurrentRun(textPosition);
SplitCurrentRun(textPosition);
while (textLength > 0)
{
LinkedRun& run = FetchNextRun(&textLength);
run.glyphOrientation = glyphOrientations[glyphOrientationAngle & 3];
run.isSideways = !!isSideways;
run.isReversed = !!isRightToLeft;
run.bidiLevel = adjustedBidiLevel;
}
}
catch (...)
{
return E_FAIL; // Unknown error, probably out of memory.
}
return S_OK;
}
