public static int GetGlyphShapeT2(
FontInfo info, int glyphIndex, out Vertex[]?pvertices)
{
var output_ctx = new CharStringContext();
var count_ctx = new CharStringContext();
count_ctx.bounds = 1;
if (RunCharString(info, glyphIndex, ref count_ctx) != 0)
{
pvertices = new Vertex[count_ctx.num_vertices];
output_ctx.pvertices = pvertices;
if (RunCharString(info, glyphIndex, ref output_ctx) != 0)
{
return(output_ctx.num_vertices);
}
}
pvertices = null;
return(0);
}
public static int RunCharString(
FontInfo info, int glyphIndex, ref CharStringContext c)
{
if (info == null)
{
throw new ArgumentNullException(nameof(info));
}
int in_header = 1;
int maskbits = 0;
int subr_stack_height = 0;
int sp = 0;
int v = 0;
int i = 0;
int b0 = 0;
int has_subrs = 0;
int clear_stack = 0;
float f = 0;
var subrs = info.subrs;
Span <float> s = stackalloc float[48];
var subr_stack = new Buffer[10];
var b = CffIndexGet(info.charstrings, glyphIndex);
while (b.Cursor < b.Size)
{
i = 0;
clear_stack = 1;
b0 = b.GetByte();
switch (b0)
{
case 0x13:
case 0x14:
if (in_header != 0)
{
maskbits += sp / 2;
}
in_header = 0;
b.Skip((maskbits + 7) / 8);
break;
case 0x01:
case 0x03:
case 0x12:
case 0x17:
maskbits += sp / 2;
break;
case 0x15:
in_header = 0;
if (sp < 2)
{
return(0);
}
c.RMoveTo(s[sp - 2], s[sp - 1]);
break;
case 0x04:
in_header = 0;
if (sp < 1)
{
return(0);
}
c.RMoveTo(0f, s[sp - 1]);
break;
case 0x16:
in_header = 0;
if (sp < 1)
{
return(0);
}
c.RMoveTo(s[sp - 1], 0f);
break;
case 0x05:
if (sp < 2)
{
return(0);
}
for (; (i + 1) < sp; i += 2)
{
c.RLineTo(s[i], s[i + 1]);
}
break;
case 0x07:
case 0x06:
if (sp < 1)
{
return(0);
}
int goto_vlineto = b0 == 0x07 ? 1 : 0;
for (; ;)
{
if (goto_vlineto == 0)
{
if (i >= sp)
{
break;
}
c.RLineTo(s[i], 0);
i++;
}
goto_vlineto = 0;
if (i >= sp)
{
break;
}
c.RLineTo(0f, s[i]);
i++;
}
break;
case 0x1F:
case 0x1E:
if (sp < 4)
{
return(0);
}
int goto_hvcurveto = b0 == 0x1F ? 1 : 0;
for (; ;)
{
if (goto_hvcurveto == 0)
{
if ((i + 3) >= sp)
{
break;
}
c.RCCurveTo(
0f, s[i],
s[i + 1], s[i + 2],
s[i + 3], ((sp - i) == 5) ? s[i + 4] : 0f);
i += 4;
}
goto_hvcurveto = 0;
if ((i + 3) >= sp)
{
break;
}
c.RCCurveTo(
s[i], 0f,
s[i + 1], s[i + 2],
((sp - i) == 5) ? s[i + 4] : 0f, s[i + 3]);
i += 4;
}
break;
case 0x08:
if (sp < 6)
{
return(0);
}
for (; (i + 5) < sp; i += 6)
{
c.RCCurveTo(
s[i], s[i + 1],
s[i + 2], s[i + 3],
s[i + 4], s[i + 5]);
}
break;
case 0x18:
if (sp < 8)
{
return(0);
}
for (; (i + 5) < (sp - 2); i += 6)
{
c.RCCurveTo(
s[i], s[i + 1],
s[i + 2], s[i + 3],
s[i + 4], s[i + 5]);
}
if ((i + 1) >= sp)
{
return(0);
}
c.RLineTo(s[i], s[i + 1]);
break;
case 0x19:
if (sp < 8)
{
return(0);
}
for (; (i + 1) < (sp - 6); i += 2)
{
c.RLineTo(s[i], s[i + 1]);
}
if ((i + 5) >= sp)
{
return(0);
}
c.RCCurveTo(
s[i], s[i + 1],
s[i + 2], s[i + 3],
s[i + 4], s[i + 5]);
break;
case 0x1A:
case 0x1B:
if (sp < 4)
{
return(0);
}
f = 0f;
if ((sp & 1) != 0)
{
f = s[i];
i++;
}
for (; (i + 3) < sp; i += 4)
{
if (b0 == 0x1B)
{
c.RCCurveTo(
s[i], f,
s[i + 1], s[i + 2],
s[i + 3], 0);
}
else
{
c.RCCurveTo(
f, s[i],
s[i + 1], s[i + 2],
0, s[i + 3]);
}
f = 0;
}
break;
case 0x0A:
case 0x1D:
if (b0 == 0x0A)
{
if (has_subrs == 0)
{
if (info.fdselect.Size != 0)
{
subrs = CidGetGlyphSubRs(info, glyphIndex);
}
has_subrs = 1;
}
}
if (sp < 1)
{
return(0);
}
v = (int)s[--sp];
if (subr_stack_height >= 10)
{
return(0);
}
subr_stack[subr_stack_height++] = b;
b = GetSubr(b0 == 0x0A ? subrs : info.gsubrs, v);
if (b.Size == 0)
{
return(0);
}
b.Cursor = 0;
clear_stack = 0;
break;
case 0x0B:
if (subr_stack_height <= 0)
{
return(0);
}
b = subr_stack[--subr_stack_height];
clear_stack = 0;
break;
case 0x0E:
c.CloseShape();
return(1);
case 0x0C:
{
float dx1 = 0;
float dx2 = 0;
float dx3 = 0;
float dx4 = 0;
float dx5 = 0;
float dx6 = 0;
float dy1 = 0;
float dy2 = 0;
float dy3 = 0;
float dy4 = 0;
float dy5 = 0;
float dy6 = 0;
float dx = 0;
float dy = 0;
int b1 = b.GetByte();
switch (b1)
{
case 0x22:
if (sp < 7)
{
return(0);
}
dx1 = s[0];
dx2 = s[1];
dy2 = s[2];
dx3 = s[3];
dx4 = s[4];
dx5 = s[5];
dx6 = s[6];
c.RCCurveTo(dx1, 0f, dx2, dy2, dx3, 0f);
c.RCCurveTo(dx4, 0f, dx5, -dy2, dx6, 0f);
break;
case 0x23:
if (sp < 13)
{
return(0);
}
dx1 = s[0];
dy1 = s[1];
dx2 = s[2];
dy2 = s[3];
dx3 = s[4];
dy3 = s[5];
dx4 = s[6];
dy4 = s[7];
dx5 = s[8];
dy5 = s[9];
dx6 = s[10];
dy6 = s[11];
c.RCCurveTo(dx1, dy1, dx2, dy2, dx3, dy3);
c.RCCurveTo(dx4, dy4, dx5, dy5, dx6, dy6);
break;
case 0x24:
if (sp < 9)
{
return(0);
}
dx1 = s[0];
dy1 = s[1];
dx2 = s[2];
dy2 = s[3];
dx3 = s[4];
dx4 = s[5];
dx5 = s[6];
dy5 = s[7];
dx6 = s[8];
c.RCCurveTo(dx1, dy1, dx2, dy2, dx3, 0f);
c.RCCurveTo(dx4, 0f, dx5, dy5, dx6, -(dy1 + dy2 + dy5));
break;
case 0x25:
if (sp < 11)
{
return(0);
}
dx1 = s[0];
dy1 = s[1];
dx2 = s[2];
dy2 = s[3];
dx3 = s[4];
dy3 = s[5];
dx4 = s[6];
dy4 = s[7];
dx5 = s[8];
dy5 = s[9];
dx6 = dy6 = s[10];
dx = dx1 + dx2 + dx3 + dx4 + dx5;
dy = dy1 + dy2 + dy3 + dy4 + dy5;
if (Math.Abs(dx) > Math.Abs(dy))
{
dy6 = -dy;
}
else
{
dx6 = -dx;
}
c.RCCurveTo(dx1, dy1, dx2, dy2, dx3, dy3);
c.RCCurveTo(dx4, dy4, dx5, dy5, dx6, dy6);
break;
default:
return(0);
}
}
break;
default:
if ((b0 != 255) && (b0 != 28) && ((b0 < 32) || (b0 > 254)))
{
return(0);
}
if (b0 == 255)
{
f = (float)(int)b.Get(4) / 0x10000;
}
else
{
b.Skip(-1);
f = (short)CffInt(ref b);
}
if (sp >= 48)
{
return(0);
}
s[sp++] = f;
clear_stack = 0;
break;
}
if (clear_stack != 0)
{
sp = 0;
}
}
return(0);
}
