static float MeasureGlyphPlans(this GlyphLayout glyphLayout,
float pxscale,
bool snapToGrid)
{
//user can implement this with some 'PixelScaleEngine'
IGlyphPositions glyphPositions = glyphLayout.ResultUnscaledGlyphPositions;
float accumW = 0; //acummulate Width
if (snapToGrid)
{
int finalGlyphCount = glyphPositions.Count;
for (int i = 0; i < finalGlyphCount; ++i)
{
//all from pen-pos
ushort glyphIndex = glyphPositions.GetGlyph(i,
out ushort input_offset,
out short offsetX,
out short offsetY,
out short advW);
accumW += (short)Math.Round(advW * pxscale);
}
}
else
{
//not snap to grid
//scaled but not snap to grid
int finalGlyphCount = glyphPositions.Count;
for (int i = 0; i < finalGlyphCount; ++i)
{
//all from pen-pos
ushort glyphIndex = glyphPositions.GetGlyph(i,
out ushort input_offset,
out short offsetX,
out short offsetY,
out short advW);
accumW += advW * pxscale;
}
}
return(accumW);
}
//static void ConcatMeasureBox(ref float accumW, ref float accumH, ref MeasuredStringBox measureBox)
//{
// accumW += measureBox.width;
// float h = measureBox.CalculateLineHeight();
// if (h > accumH)
// {
// accumH = h;
// }
//}
public static MeasuredStringBox LayoutAndMeasureString(
this GlyphLayout glyphLayout,
char[] textBuffer,
int startAt,
int len,
float fontSizeInPoints,
float limitW = -1,//-1 unlimit scaled width (px)
bool snapToGrid = true)
{
//1. unscale layout, in design unit
glyphLayout.Layout(textBuffer, startAt, len);
//2. scale to specific font size
Typeface typeface = glyphLayout.Typeface;
float pxscale = typeface.CalculateScaleToPixelFromPointSize(fontSizeInPoints);
//....
float scaled_accumX = 0;
if (limitW < 0)
{
//no limit
scaled_accumX = MeasureGlyphPlans(
glyphLayout,
pxscale,
snapToGrid);
return(new MeasuredStringBox(
scaled_accumX,
typeface.Ascender,
typeface.Descender,
typeface.LineGap,
typeface.ClipedAscender,
typeface.ClipedDescender,
pxscale));
}
else if (limitW > 0)
{
scaled_accumX = MeasureGlyphPlanWithLimitWidth(
glyphLayout,
pxscale,
limitW,
snapToGrid,
out int stopAtChar);
var mstrbox = new MeasuredStringBox(
scaled_accumX,
typeface.Ascender,
typeface.Descender,
typeface.LineGap,
typeface.ClipedAscender,
typeface.ClipedDescender,
pxscale);
mstrbox.StopAt = (ushort)stopAtChar;
return(mstrbox);
}
else
{
return(new MeasuredStringBox(
0,
typeface.Ascender,
typeface.Descender,
typeface.LineGap,
typeface.ClipedAscender,
typeface.ClipedDescender,
pxscale));
}
}
static float MeasureGlyphPlanWithLimitWidth(this GlyphLayout glyphLayout,
float pxscale,
float limitWidth,
bool snapToGrid,
out int stopAtGlyphIndex)
{
//user can implement this with some 'PixelScaleEngine'
IGlyphPositions glyphPositions = glyphLayout.ResultUnscaledGlyphPositions;
float accumW = 0; //acummulate Width
stopAtGlyphIndex = 0;
if (snapToGrid)
{
int finalGlyphCount = glyphPositions.Count;
for (int i = 0; i < finalGlyphCount; ++i)
{
//all from pen-pos
ushort glyphIndex = glyphPositions.GetGlyph(i,
out ushort input_offset,
out short offsetX,
out short offsetY,
out short advW);
stopAtGlyphIndex = i; //***
//
short w = (short)Math.Round(advW * pxscale);
if (accumW + w > limitWidth)
{
//stop
break;
}
else
{
accumW += w;
}
}
}
else
{
//not snap to grid
//scaled but not snap to grid
int finalGlyphCount = glyphPositions.Count;
for (int i = 0; i < finalGlyphCount; ++i)
{
//all from pen-pos
ushort glyphIndex = glyphPositions.GetGlyph(i,
out ushort input_offset,
out short offsetX,
out short offsetY,
out short advW);
stopAtGlyphIndex = i; //***
float w = advW * pxscale;
if (accumW + w > limitWidth)
{
//stop
break;
}
else
{
accumW += w;
}
}
}
return(accumW);
////measure string
//if (str.Length < 1)
//{
// charFitWidth = 0;
//}
//_reusableMeasureBoxList.Clear(); //reset
//float pxscale = _currentTypeface.CalculateScaleToPixelFromPointSize(_fontSizeInPts);
////NOET:at this moment, simple operation
////may not be simple...
////-------------------
////input string may contain more than 1 script lang
////user can parse it by other parser
////but in this code, we use our Typography' parser
////-------------------
////user must setup the CustomBreakerBuilder before use
//int cur_startAt = startAt;
//float accumW = 0;
//float acc_x = 0;//accum_x
//float acc_y = 0;//accum_y
//float g_x = 0;
//float g_y = 0;
//float x = 0;
//float y = 0;
//foreach (Typography.TextLayout.BreakSpan breakSpan in BreakToLineSegments(str, startAt, len))
//{
// //measure string at specific px scale
// _glyphLayout.Layout(str, breakSpan.startAt, breakSpan.len);
// //
// _reusableGlyphPlanList.Clear();
// _glyphLayout.GenerateUnscaledGlyphPlans(_reusableGlyphPlanList);
// //measure ...
// //measure each glyph
// //limit at specific width
// int glyphCount = _reusableGlyphPlanList.Count;
// for (int i = 0; i < glyphCount; ++i)
// {
// UnscaledGlyphPlan glyphPlan = _reusableGlyphPlanList[i];
// float ngx = acc_x + (float)Math.Round(glyphPlan.OffsetX * pxscale);
// float ngy = acc_y + (float)Math.Round(glyphPlan.OffsetY * pxscale);
// //NOTE:
// // -glyphData.TextureXOffset => restore to original pos
// // -glyphData.TextureYOffset => restore to original pos
// //--------------------------
// g_x = (float)(x + (ngx)); //ideal x
// g_y = (float)(y + (ngy));
// float g_w = (float)Math.Round(glyphPlan.AdvanceX * pxscale);
// acc_x += g_w;
// //g_x = (float)Math.Round(g_x);
// g_y = (float)Math.Floor(g_y);
// float right = g_x + g_w;
// if (right >= accumW)
// {
// //stop here at this glyph
// charFit = i - 1;
// //TODO: review this
// charFitWidth = (int)System.Math.Round(accumW);
// return;
// }
// else
// {
// accumW = right;
// }
// }
//}
//charFit = 0;
//charFitWidth = 0;
}
