| public CalculateScale ( float sizeInPointUnit, int resolution = 96 ) : float | ||
| sizeInPointUnit | float | |
| resolution | int | |
| return | float | |
public NOpenTypeActualFont(NOpenTypeFontFace ownerFace, float sizeInPoints, FontStyle style)
{
this.ownerFace = ownerFace;
this.sizeInPoints = sizeInPoints;
this.style = style;
this.typeFace = ownerFace.Typeface;
//calculate scale ***
scale = typeFace.CalculateScale(sizeInPoints);
}
public void Print(Typeface typeface, float size, char[] str, GlyphPlan[] glyphPlanBuffer)
{
//check if we have created a glyph cache
GlyphsCache glyphCache;
if (!_glyphCaches.TryGetValue(typeface, out glyphCache))
{
//create new
glyphCache = new GlyphsCache(typeface);
_glyphCaches.Add(typeface, glyphCache);
}
//----------------------------------------------
//1. convert char[] to glyph[]
//2. send to shaping engine
//3. layout position of each glyph
//----------------------------------------------
var glyphPathBuilder = new GlyphPathBuilderVxs(typeface);
int j = str.Length;
if (j > 1)
{
//for debug
}
//TODO:....
//2.
//shaping, glyph substitution
for (int i = 0; i < j; ++i)
{
var glyphPlan = new GlyphPlan();
glyphPlan.glyphIndex = (ushort)typeface.LookupIndex(str[i]);
glyphPlanBuffer[i] = glyphPlan;
}
float scale = typeface.CalculateScale(size);
float cx = 0;
float cy = 0;
bool enable_kerning = this.EnableKerning;
for (int i = 0; i < j; ++i)
{
GlyphPlan glyphPlan = glyphPlanBuffer[i];
ushort glyIndex = glyphPlan.glyphIndex;
//-----------------------------------
//check if we static vxs/bmp for this glyph
//if not, create and cache
//-----------------------------------
glyphPathBuilder.BuildFromGlyphIndex(glyIndex, size);
//-----------------------------------
var vxs = glyphPathBuilder.GetVxs();
//this advWidth in font design unit
float advWidth = typeface.GetAdvanceWidthFromGlyphIndex(glyIndex) * scale;
//----------------------------------
glyphPlan.x = cx;
glyphPlan.y = 0;
glyphPlan.advX = advWidth;
glyphPlan.vxs = vxs;
//
if (enable_kerning && i > 0)
{
//check kerning
advWidth += typeface.GetKernDistance(glyphPlanBuffer[i - 1].glyphIndex, glyphPlanBuffer[i].glyphIndex) * scale;
}
cx += advWidth;
}
//TODO:....
//2.
//shaping, glyph substitution
//3. layout glyph position
//----------------------------------------------
//4. actual render
}