bool nuiTextLayout::Layout(const nglString& rString)
{
// Transform the string in a vector of nglUChar, also keep the offsets from the original chars to the nglUChar and vice versa
int32 len = rString.GetLength();
int32 i = 0;
//printf("layout ");
while (i < len)
{
nglUChar ch = rString.GetNextUChar(i);
//printf("'%c' (%d) ", (char)ch, ch);
mUnicode.push_back(ch);
mOffsetInString.push_back(i);
mOffsetInUnicode.push_back(mUnicode.size() - 1);
}
//printf("\n");
// General algorithm:
// 1. Split text into paragraphs (LayoutText)
// 2. Split paragraphs into ranges (LayoutParagraph)
// 3. Split ranges into fonts
// 4. Split ranges into lines / words if needed
int32 start = 0;
int32 position = 0;
int32 count = mUnicode.size();
while (position < count)
{
// Scan through the text and look for end of line markers
nglUChar ch = mUnicode[position];
if (ch == '\n' || ch == 0xb || ch == 0x2028 || ch == 0x2029)
{
// Found a paragraph
//printf("Paragraph %d -> %d (%d chars)\n", start, position, position - start);
LayoutParagraph(start, position - start); // Eat the \n char
start = position + 1;
}
position++;
}
if (start < position)
{
//printf("last Paragraph %d -> %d (%d chars)\n", start, position, position - start);
LayoutParagraph(start, position - start); // Eat the \n char
start = position;
}
mAscender = 0;
mDescender = 0;
//printf("Map scripts to fonts:\n");
int32 c = 0;
// Find the needed fonts for each script:
std::map<nuiUnicodeScript, nuiFontBase*> FontSet;
{
std::map<nuiUnicodeScript, std::set<nglUChar> >::iterator it = mCharsets.begin();
std::map<nuiUnicodeScript, std::set<nglUChar> >::iterator end = mCharsets.end();
while (it != end)
{
//printf("%d %s -> ", c, nuiGetUnicodeScriptName(it->first).GetChars());
const std::set<nglUChar>& charset(it->second);
nuiFontBase* pFont = NULL;
// First try the requested font
{
std::set<nglUChar>::const_iterator it = charset.begin();
std::set<nglUChar>::const_iterator end = charset.end();
while (it != end && mStyle.GetFont()->GetGlyphIndex(*it) > 0)
++it;
// If all the glyphs are available in the font we're done...
if (it == end)
pFont = mStyle.GetFont();
else
{
//printf("[couldn't find glyph %d '%c' in requested font] ", *it, *it);
}
}
// If the requested font doesn't work, try to find one that does:
if (!pFont)
{
nuiFontRequest request(mStyle.GetFont());
request.MustHaveGlyphs(charset, 500, false);
pFont = nuiFontManager::GetManager().GetFont(request);
}
FontSet[it->first] = pFont;
//printf("%s\n", pFont->GetFamilyName().GetChars());
++it;
c++;
}
}
//printf("Map scripts to fonts DONE\n");
i = 0;
nuiRect rect;
float PenX = 0;
float PenY = 0;
// Assign the correct font to each run
for (uint32 p = 0; p < mpParagraphs.size(); p++)
{
Paragraph* pParagraph = mpParagraphs[p];
for (uint32 l = 0; l < pParagraph->size(); l++)
{
nuiTextLine* pLine = (*pParagraph)[l];
pLine->SetPosition(PenX, PenY);
PenX = 0;
float x = 0;
float y = 0;
for (uint32 r = 0; r < pLine->GetRunCount(); r++)
{
nuiTextRun* pRun = pLine->GetRun(r);
pRun->mX = x;
pRun->mY = y;
nuiFontBase* pFont = FontSet[pRun->GetScript()];
if (!pRun->IsDummy())
{
// Only shape real runs.
pRun->SetFont(pFont);
pFont->Shape(pRun);
nuiFontInfo finfo;
pFont->GetInfo(finfo);
// Prepare glyphs:
std::vector<nuiTextGlyph>& rGlyphs(pRun->GetGlyphs());
for (int32 g = 0; g < rGlyphs.size(); g++)
{
nuiTextGlyph& rGlyph(rGlyphs.at(g));
pFont->PrepareGlyph(PenX + x, PenY + y, rGlyph);
const nuiSize W = rGlyph.AdvanceX;
// nuiSize h = finfo.AdvanceMaxH;
const nuiSize X = rGlyph.mX + rGlyph.BearingX;
const nuiSize Y = rGlyph.mY - finfo.Ascender;
const nuiSize H = finfo.Height;
nuiRect rr(rect);
rect.Union(rr, nuiRect(PenX + x + X, PenY + y + Y, W, H));
}
}
x += pRun->GetAdvanceX();
//y += pRun->GetAdvanceY();
//printf("\trange %d <%d.%d.%d> (%d - %d) (%s --> %s / %s) (advance: %f / %f)\n", i, p, l, r, pRun->GetPosition(), pRun->GetLength(), nuiGetUnicodeScriptName(pRun->GetScript()).GetChars(), pFont->GetFamilyName().GetChars(), pFont->GetStyleName().GetChars(), pRun->GetAdvanceX(), pRun->GetAdvanceY());
i++;
}
PenY += pLine->GetAdvanceY();
}
}
nuiTextLine* pFirstLine = NULL;
if (GetParagraphCount() > 0)
if (GetLineCount(0) > 0)
pFirstLine = GetLine(0, 0);
if (pFirstLine)
mAscender = pFirstLine->GetAscender();
nuiTextLine* pLastLine = NULL;
if (GetParagraphCount() > 0)
if (GetLineCount(GetParagraphCount() - 1) > 0)
pLastLine = GetLine(GetParagraphCount() - 1, GetLineCount(GetParagraphCount() - 1) - 1);
if (pLastLine)
mDescender = pLastLine->GetDescender();
mXMin = rect.Left();
mXMax = rect.Right();
mYMin = rect.Top();
mYMax = rect.Bottom();
mCharsets.clear();
return true;
}
bool nuiLayoutConstraint::Set(const nglString& rDescription)
{
int index = 0;
nglUChar c = rDescription.GetNextUChar(index);
if (c == '[')
{
// Fix start + ?
int pos = index;
int end = index;
c = rDescription.GetNextUChar(index);
while (c != ',' && c != '}')
{
end = index;
c = rDescription.GetNextUChar(index);
}
nglString anchor1 = rDescription.Extract(pos, index - pos - 1);
anchor1.Trim();
if (c == ',')
{
// Fix stop or fix size
int pos = index;
int end = index;
c = rDescription.GetNextUChar(index);
while (c != ']' && c != '}')
{
end = index;
c = rDescription.GetNextUChar(index);
}
nglString anchor2 = rDescription.Extract(pos, index - pos - 1);
anchor2.Trim();
if (c == ']')
{
// Start and Stop:
SetStartAndStop(anchor1, anchor2);
return true;
}
else if (c == '}')
{
// Start and size:
SetStartAndSize(anchor1, anchor2.GetCFloat());
return true;
}
}
else if (c == '}')
{
// Fix start
SetStart(anchor1);
return true;
}
}
else if (c == '{')
{
// Fix end + ?
int pos = index;
int end = index;
c = rDescription.GetNextUChar(index);
while (c != ',' && c != '}' && c != ']')
{
end = index;
c = rDescription.GetNextUChar(index);
}
nglString anchor1 = rDescription.Extract(pos, index - pos - 1);
anchor1.Trim();
if (c == ',')
{
// Fix stop or fix size
int pos = index;
int end = index;
c = rDescription.GetNextUChar(index);
while (c != ']' && c != '}' && c != ',')
{
end = index;
c = rDescription.GetNextUChar(index);
}
nglString anchor2 = rDescription.Extract(pos, index - pos - 1);
anchor2.Trim();
if (c == ']')
{
// size and Stop:
SetStopAndSize(anchor2, anchor1.GetCFloat());
return true;
}
else if (c == '}')
{
// Midle and size:
if (anchor2.IsFloat())
SetMiddleAndSize(anchor1, anchor2.GetCFloat());
else
SetMiddle(anchor1, anchor2);
return true;
}
else if (c == ',')
{
nglString anchor2 = rDescription.Extract(pos, index - pos - 1);
anchor2.Trim();
// Fix stop or fix size
int pos = index;
int end = index;
c = rDescription.GetNextUChar(index);
while (c != '}')
{
end = index;
c = rDescription.GetNextUChar(index);
}
nglString anchor3 = rDescription.Extract(pos, index - pos - 1);
anchor3.Trim();
SetMiddleAndSize(anchor1, anchor2, anchor3.GetCFloat());
return true;
}
}
else if (c == '}')
{
// Fix middle
if (anchor1.IsFloat())
SetMiddleAndSize(nglString::Null, anchor1.GetCFloat());
else
SetMiddle(anchor1);
return true;
}
else if (c == ']')
{
// Fix stop
SetStop(anchor1);
return true;
}
}
else
{
SetSize(rDescription.GetCFloat());
return true;
}
return false;
}