Font.FindGlyph and font.Glyphs return wrong data #206
Description
Font ProggySmall.ttf everything renders and works correctly.
However if you print the contents of each glyph from ImGui.GetFont() you get uvs that dont make sense, AdvanceX that doesnt make sense etc. I tried to find the issue to the best of my knowledge, set structs to sequential in hopes that there is some layout mismatch, converted chars to utf8, the result is always the same - wrong data is provided.
I am not sure what is going on there.
here is the case where i found out the problem
static bool test = false;
/// Draws vertical text. The position is the bottom left of the text rect.
public static unsafe void AddTextVertical(string text, Color text_color, Vector2? position = null)
{
if (string.IsNullOrEmpty(text))
{
text = "Null";
}
Vector2 pos = position.HasValue ? position.Value + ImGui.GetWindowPos() : ImGui.GetCursorPos() + ImGui.GetWindowPos();
ImDrawListPtr DrawList = ImGui.GetWindowDrawList();
pos.x = Mathf.Round(pos.x);
pos.y = Mathf.Round(pos.y);
ImFontPtr font = ImGui.GetFont();
if (!test)
{
var glyphs = font.Glyphs;
for (int i = 0; i < glyphs.Size; i++)
{
var g = glyphs[i];
Debug.Log("g: " + g.Codepoint + " a:" + g.AdvanceX + " v0:" + g.V0 + " v1:" + g.V1);
}
test = true;
}
byte[] bytes = Encoding.Default.GetBytes(text);
text = Encoding.UTF8.GetString(bytes);
ImFontGlyphPtr glyph;
char c;
//ImGuiContext g = *GImGui;
Vector2 text_size = ImGui.CalcTextSize(text);
float textX = text_size.x / text.Length;
for (int i = 0; i < text.Length; i++)
{
c = text[i];
glyph = font.FindGlyph(c);
if (glyph.NativePtr == null) continue;
DrawList.PrimReserve(6, 4);
DrawList.PrimQuadUV(
pos + new Vector2(glyph.Y0, -glyph.X0),
pos + new Vector2(glyph.Y0, -glyph.X1),
pos + new Vector2(glyph.Y1, -glyph.X1),
pos + new Vector2(glyph.Y1, -glyph.X0),
new Vector2(glyph.U0, glyph.V0),
new Vector2(glyph.U1, glyph.V0),
new Vector2(glyph.U1, glyph.V1),
new Vector2(glyph.U0, glyph.V1),
text_color.ToUint());
pos.y -= textX ;
}
ImGui.SetCursorPosX(text_size.y);
}