bool
ParagraphLayout::_AppendGlyphInfos(const TextSpan& span)
{
int charCount = span.CountChars();
if (charCount == 0)
return true;
const BString& text = span.Text();
const BFont& font = span.Style().Font();
// Allocate arrays
float* escapementArray = new (std::nothrow) float[charCount];
if (escapementArray == NULL)
return false;
ArrayDeleter<float> escapementDeleter(escapementArray);
// Fetch glyph spacing information
font.GetEscapements(text, charCount, escapementArray);
// Append to glyph buffer and convert escapement scale
float size = font.Size();
const char* c = text.String();
for (int i = 0; i < charCount; i++) {
if (!_AppendGlyphInfo(UTF8ToCharCode(&c), escapementArray[i] * size,
span.Style())) {
return false;
}
}
return true;
}
bool
Paragraph::Insert(int32 offset, const TextSpan& newSpan)
{
_InvalidateCachedLength();
int32 index = 0;
while (index < fTextSpans.CountItems()) {
const TextSpan& span = fTextSpans.ItemAtFast(index);
if (offset - span.CountChars() < 0)
break;
offset -= span.CountChars();
index++;
}
if (fTextSpans.CountItems() == index)
return Append(newSpan);
// Try to merge with span at index if the TextStyles are equal
TextSpan span = fTextSpans.ItemAtFast(index);
if (span.Style() == newSpan.Style()) {
span.Insert(offset, newSpan.Text());
return fTextSpans.Replace(index, span);
}
if (offset == 0) {
if (index > 0) {
// Try to merge with TextSpan before if offset == 0 && index > 0
TextSpan span = fTextSpans.ItemAtFast(index - 1);
if (span.Style() == newSpan.Style()) {
span.Insert(span.CountChars(), newSpan.Text());
return fTextSpans.Replace(index - 1, span);
}
}
// Just insert the new span before the one at index
return fTextSpans.Add(newSpan, index);
}
// Split the span,
TextSpan spanBefore = span.SubSpan(0, offset);
TextSpan spanAfter = span.SubSpan(offset, span.CountChars() - offset);
return fTextSpans.Replace(index, spanBefore)
&& fTextSpans.Add(newSpan, index + 1)
&& fTextSpans.Add(spanAfter, index + 2);
}