void FallbackFontRenderer::Draw(uint32_t unicode, spades::Vector2 offset,
float size, spades::Vector4 color) {
renderer->SetColorAlphaPremultiplied(color);
float x = offset.x;
float y = offset.y;
auto glyph = FindGlyph(unicode);
if(glyph.img == nullptr) {
// no glyph found! draw box in the last resort
IImage *img = whiteImage;
renderer->DrawImage(img, AABB2(x, y, size, 1.f));
renderer->DrawImage(img, AABB2(x, y + size - 1.f, size, 1.f));
renderer->DrawImage(img, AABB2(x, y + 1.f, 1.f, size - 2.f));
renderer->DrawImage(img, AABB2(x + size - 1.f, y + 1.f, 1.f, size - 2.f));
return;
}
if(glyph.w == 0) {
// null glyph.
return;
}
float scale = size * glyph.sizeInverse;
if(roundSize || scale < 1.f) {
float newScale = std::max(1.f, floorf(scale));
// vertical-align: baseline
offset.y += (scale - newScale) * glyph.size;
scale = newScale;
}
AABB2 inRect(glyph.x, glyph.y, glyph.w, glyph.h);
AABB2 outRect(glyph.offX, glyph.offY, glyph.w, glyph.h);
// margin to make the border completely transparent
// (considering the OpenGL's linear interpolation)
if(!roundSize){
inRect.min.x -= 0.5f;
inRect.min.y -= 0.5f;
outRect.min.x -= 0.5f;
outRect.min.y -= 0.5f;
inRect.max.x += 0.5f;
inRect.max.y += 0.5f;
outRect.max.x += 0.5f;
outRect.max.y += 0.5f;
}
outRect.min *= scale;
outRect.max *= scale;
outRect.min += offset;
outRect.max += offset;
renderer->DrawImage(glyph.img, outRect, inRect);
}
