GuiGlyph.cpp

/****************************************************************************
 * libgui
 * Daryl Borth 2026
 * GuiGlyph.cpp
 ***************************************************************************/
 
#include "Gui.h"
 
GuiGlyph::GuiGlyph(GLYPH k, const char * letter) : kind(k), text(nullptr), meshFeather(-1.0f)
{
    float w, h;
    GuiGlyph::size(kind, w, h);
    width = (int)w;
    height = (int)h;
 
    const bool takesLetter = kind == GLYPH::BUTTON || kind == GLYPH::BUMPER || kind == GLYPH::STICK;
    if(takesLetter && letter && *letter)
    {
        const GuiTheme& theme = GuiTheme::current();
        const int px = (int)strlen(letter) > 1 ? theme.glyphFontSizeSmall : theme.glyphFontSize;
        text = new GuiText(letter, px, theme.textInverse);
        text->setParent(this);
        text->setAlignment(ALIGN_H::CENTRE, ALIGN_V::MIDDLE);
        // capitals and digits have no descenders, so the font's line box centers them high; this puts the same
        // padding above the letter as below it
        // (the bumper pill is shorter than the round glyphs, so its single letter takes one less)
        text->setNudgeY(kind == GLYPH::BUMPER && px == theme.glyphFontSize ? 1 : 2);
    }
}
 
GuiGlyph::~GuiGlyph()
{
    delete text;
}
 
void GuiGlyph::draw()
{
    if(!this->isVisible())
        return;
 
    const int a = this->getAlpha();
    if(a > 0)
    {
        VideoDriver * video = platform->getVideo();
        const float uiScale = video->getUIScale();
        const float feather = uiScale > 0.0f ? 1.0f / uiScale : 1.0f;
        if(feather != meshFeather)
        {
            mesh = GuiMesh(feather);
            GuiGlyph::build(mesh, kind, (float)width, (float)height);
            meshFeather = feather;
        }
 
        const float ox = (float)this->getLeft(), oy = (float)this->getTop();
        const std::vector<MeshVertex>& src = mesh.vertices();
        scratch.resize(src.size());
        for(size_t i = 0; i < src.size(); i++)
        {
            scratch[i] = src[i];
            scratch[i].x += ox;
            scratch[i].y += oy;
            if(a < 255)
                scratch[i].c.a = (uint8_t)((src[i].c.a * a + 127) / 255);
        }
        if(!scratch.empty())
            video->getImageRenderer()->drawMesh(scratch.data(), scratch.size());
 
        if(text)
            text->draw();
    }
 
    this->updateEffects();
}