void UniscribeHelper::fillShapes()
{
m_shapes.resize(m_runs.size());
for (size_t i = 0; i < m_runs.size(); i++) {
int startItem = m_runs[i].iCharPos;
int itemLength = m_inputLength - startItem;
if (i < m_runs.size() - 1)
itemLength = m_runs[i + 1].iCharPos - startItem;
int numGlyphs;
if (itemLength < UNISCRIBE_HELPER_STACK_CHARS) {
// We'll start our buffer sizes with the current stack space
// available in our buffers if the current input fits. As long as
// it doesn't expand past that we'll save a lot of time mallocing.
numGlyphs = UNISCRIBE_HELPER_STACK_CHARS;
} else {
// When the input doesn't fit, give up with the stack since it will
// almost surely not be enough room (unless the input actually
// shrinks, which is unlikely) and just start with the length
// recommended by the Uniscribe documentation as a "usually fits"
// size.
numGlyphs = itemLength * 3 / 2 + 16;
}
// Convert a string to a glyph string trying the primary font, fonts in
// the fallback list and then script-specific last resort font.
Shaping& shaping = m_shapes[i];
if (!shape(&m_input[startItem], itemLength, numGlyphs, m_runs[i], shaping))
continue;
// At the moment, the only time m_disableFontFallback is set is
// when we look up glyph indices for non-BMP code ranges. So,
// we can skip the glyph placement. When that becomes not the case
// any more, we have to add a new flag to control glyph placement.
if (m_disableFontFallback)
continue;
// Compute placements. Note that offsets is documented incorrectly
// and is actually an array.
// DC that we lazily create if Uniscribe commands us to.
// (this does not happen often because scriptCache is already
// updated when calling ScriptShape).
HDC tempDC = 0;
HGDIOBJ oldFont = 0;
HRESULT hr;
while (true) {
shaping.m_prePadding = 0;
hr = ScriptPlace(tempDC, shaping.m_scriptCache,
&shaping.m_glyphs[0],
static_cast<int>(shaping.m_glyphs.size()),
&shaping.m_visualAttributes[0], &m_runs[i].a,
&shaping.m_advance[0], &shaping.m_offsets[0],
&shaping.m_abc);
if (hr != E_PENDING)
break;
// Allocate the DC and run the loop again.
tempDC = GetDC(0);
oldFont = SelectObject(tempDC, shaping.m_hfont);
}
if (FAILED(hr)) {
// Some error we don't know how to handle. Nuke all of our data
// since we can't deal with partially valid data later.
m_runs.clear();
m_shapes.clear();
m_screenOrder.clear();
}
if (tempDC) {
SelectObject(tempDC, oldFont);
ReleaseDC(0, tempDC);
}
}
adjustSpaceAdvances();
if (m_letterSpacing != 0 || m_wordSpacing != 0)
applySpacing();
}
void UniscribeHelper::fillShapes()
{
m_shapes.resize(m_runs.size());
for (size_t i = 0; i < m_runs.size(); i++) {
int startItem = m_runs[i].iCharPos;
int itemLength = m_inputLength - startItem;
if (i < m_runs.size() - 1)
itemLength = m_runs[i + 1].iCharPos - startItem;
int numGlyphs;
if (itemLength < cUniscribeHelperStackChars) {
// We'll start our buffer sizes with the current stack space
// available in our buffers if the current input fits. As long as
// it doesn't expand past that we'll save a lot of time mallocing.
numGlyphs = cUniscribeHelperStackChars;
} else {
// When the input doesn't fit, give up with the stack since it will
// almost surely not be enough room (unless the input actually
// shrinks, which is unlikely) and just start with the length
// recommended by the Uniscribe documentation as a "usually fits"
// size.
numGlyphs = itemLength * 3 / 2 + 16;
}
// Convert a string to a glyph string trying the primary font, fonts in
// the fallback list and then script-specific last resort font.
Shaping& shaping = m_shapes[i];
if (!shape(&m_input[startItem], itemLength, numGlyphs, m_runs[i], m_scriptTags[i], shaping))
continue;
// At the moment, the only time m_disableFontFallback is set is
// when we look up glyph indices for non-BMP code ranges. So,
// we can skip the glyph placement. When that becomes not the case
// any more, we have to add a new flag to control glyph placement.
if (m_disableFontFallback)
continue;
// Compute placements. Note that offsets is documented incorrectly
// and is actually an array.
EnsureCachedDCCreated();
SelectObject(m_cachedDC, shaping.m_hfont);
shaping.m_prePadding = 0;
if (FAILED(ScriptPlace(m_cachedDC, shaping.m_scriptCache,
&shaping.m_glyphs[0],
static_cast<int>(shaping.m_glyphs.size()),
&shaping.m_visualAttributes[0], &m_runs[i].a,
&shaping.m_advance[0], &shaping.m_offsets[0],
&shaping.m_abc))) {
// Some error we don't know how to handle. Nuke all of our data
// since we can't deal with partially valid data later.
m_runs.clear();
m_scriptTags.clear();
m_shapes.clear();
m_screenOrder.clear();
}
}
adjustSpaceAdvances();
if (m_letterSpacing != 0 || m_wordSpacing != 0)
applySpacing();
}
