const bitmap* freetype::get_bitmap(unsigned int char_code) const
{
implement::cache& cache = impl_->get_cache();
if (cache.find(char_code) != cache.end())
return &cache[char_code];
FT_GlyphSlot glyph = impl_->load_glyph(char_code);
if (!glyph || 0 != FT_Render_Glyph(glyph, impl_->property_.render_mode))
return nullptr;
bitmap* bitmap = &cache[char_code];
unsigned int buffer_length = glyph->bitmap.rows * glyph->bitmap.pitch;
bitmap->left = glyph->bitmap_left;
bitmap->top = glyph->bitmap_top - ascender();
bitmap->width = glyph->bitmap.width;
bitmap->height = glyph->bitmap.rows;
bitmap->advance = REAL(glyph->linearHoriAdvance, 16);
bitmap->pitch = glyph->bitmap.pitch;
bitmap->pixel_mode = glyph->bitmap.pixel_mode;
bitmap->buffer = reinterpret_cast<unsigned char*>(
memcpy(new unsigned char [buffer_length],
glyph->bitmap.buffer,
buffer_length));
return bitmap;
}
double dsp(int tn) {
double tx0 = tn / 44100.0;
double amp = 0.0;
double pi2 = 2.0 * acos(-1.0);
int tones = 1 + ((int) tx0) / 16;
for (int i = 0; i < tones; i++) {
double tx = tx0 - 16.0 * i;
double freq = ascender(tx);
double ax = fader(tx);
amp += 1.8 * ax * sin(pi2 * (0.1 * i + 20.0 * freq * tx));
}
if (amp > 1.0) amp = 1.0;
if (amp < -1.0) amp = -1.0;
return amp;
}
