/******************************************************************************
* ME_PointFromCharContext
*
* Returns a run-relative pixel position given a run-relative character
* position (character offset)
*/
int ME_PointFromCharContext(ME_Context *c, ME_Run *pRun, int nOffset, BOOL visual_order)
{
SIZE size;
ME_String *mask_text = NULL;
WCHAR *str;
if (pRun->nFlags & MERF_GRAPHICS)
{
if (nOffset)
ME_GetOLEObjectSize(c, pRun, &size);
return nOffset != 0;
} else if (pRun->nFlags & MERF_ENDPARA) {
nOffset = 0;
}
if (pRun->para->nFlags & MEPF_COMPLEX)
{
int x;
ScriptCPtoX( nOffset, FALSE, pRun->len, pRun->num_glyphs, pRun->clusters,
pRun->vis_attrs, pRun->advances, &pRun->script_analysis, &x );
if (visual_order && pRun->script_analysis.fRTL) x = pRun->nWidth - x - 1;
return x;
}
if (c->editor->cPasswordMask)
{
mask_text = ME_MakeStringR(c->editor->cPasswordMask, pRun->len);
str = mask_text->szData;
}
else
str = get_text( pRun, 0 );
ME_GetTextExtent(c, str, nOffset, pRun->style, &size);
ME_DestroyString( mask_text );
return size.cx;
}
int UniscribeHelper::characterToX(int offset) const
{
HRESULT hr;
ASSERT(offset <= m_inputLength);
// Our algorithm is to traverse the items in screen order from left to
// right, adding in each item's screen width until we find the item with
// the requested character in it.
int width = 0;
for (size_t screenIndex = 0; screenIndex < m_runs.size(); screenIndex++) {
// Compute the length of this run.
int itemIndex = m_screenOrder[screenIndex];
const SCRIPT_ITEM& item = m_runs[itemIndex];
const Shaping& shaping = m_shapes[itemIndex];
int itemLength = shaping.charLength();
if (offset >= item.iCharPos && offset <= item.iCharPos + itemLength) {
// Character offset is in this run.
int charLength = offset - item.iCharPos;
int curX = 0;
hr = ScriptCPtoX(charLength, FALSE, itemLength,
shaping.glyphLength(),
&shaping.m_logs[0], &shaping.m_visualAttributes[0],
shaping.effectiveAdvances(), &item.a, &curX);
if (FAILED(hr))
return 0;
width += curX + shaping.m_prePadding;
ASSERT(width >= 0);
return width;
}
// Move to the next item.
width += advanceForItem(itemIndex);
}
ASSERT(width >= 0);
return width;
}
