// Returns the index for a free list with a block to fit the size request
static int get_free_list_index(size_t size){
REQUIRES(0 < size && size <= 0x3FFFFFFF);
int index = 0;
size = nearest_power_2(size);
// calculate log base 2
while (size >>= 1) index++;
//lowest index is for size 2^5
index -= 5;
ENSURES(0 <= index && index < NUM_FREE_LISTS);
return index;
}
texture *font_impl::get_glyph(const wchar_t ch) const
{
shared_pointer<texture> tex = glyph_textures[ch];
if (!tex.ptr())
{
int minx, maxx, miny, maxy, advance;
if (TTF_GlyphMetrics(static_cast<TTF_Font *>(ttf_font_ptr), ch, &minx, &maxx, &miny, &maxy, &advance) == -1)
throw runtime_exception(L"Error getting glyph metrics: %hs", TTF_GetError());
SDL_Color c;
c.r = static_cast<Uint8>(fg[color::COMPONENT_RED] * 255.0f);
c.g = static_cast<Uint8>(fg[color::COMPONENT_GREEN] * 255.0f);
c.b = static_cast<Uint8>(fg[color::COMPONENT_BLUE] * 255.0f);
SDL_Surface *surf1 = TTF_RenderGlyph_Blended(static_cast<TTF_Font *>(ttf_font_ptr), ch, c);
SDL_Surface *surf2 = SDL_CreateRGBSurface(SDL_SWSURFACE, nearest_power_2(minx + surf1->w), texture_height, 32, surf1->format->Rmask, surf1->format->Gmask, surf1->format->Bmask, surf1->format->Amask);
if (!surf2)
throw runtime_exception(L"Unable to create SDL surface: %hs", SDL_GetError());
SDL_Rect dest;
dest.x = minx > 0 ? minx : 0;
dest.y = (surf2->h - font_height) + (font_ascent - maxy);
dest.w = surf1->w;
dest.h = surf1->h;
clear_pixel_alpha(surf2);
src_alpha_blit(surf1, surf2, dest.x, dest.y);
string glyph_id = string::format(L"%ls %d: %lc", face.w_string(), size, ch);
tex = new texture(FONT_TEXTURE_CATEGORY, surf2, texture::TEXTURE_ENV_REPLACE | texture::TEXTURE_WRAP_CLAMP | texture::TEXTURE_FILTER_LINEAR, texture::TEXTURE_COLORMAP, glyph_id.w_string());
glyph_textures[ch] = tex;
glyph_pct_x[ch] = static_cast<float>(advance) / static_cast<float>(surf2->w);
glyph_pct_y[ch] = static_cast<float>(font_height) / static_cast<float>(surf2->h);
glyph_widths[ch] = static_cast<float>(advance);
SDL_FreeSurface(surf2);
SDL_FreeSurface(surf1);
}
return tex.ptr();
} // font_impl::get_glyph()
font_impl::font_impl(const string & face, int size, const color & fg)
: face(face), size(size), ttf_font_ptr(0), fg(fg)
{
gsgl::log(string::format(L"font_impl: creating %ls %d (%f, %f, %f)", face.w_string(), size, fg[color::COMPONENT_RED], fg[color::COMPONENT_GREEN], fg[color::COMPONENT_BLUE]));
if (FONT_DIR.is_empty())
get_font_dir();
// common font names
string fname = FONT_DIR;
#ifdef WIN32
if (face == L"Mono")
{
fname += L"cour.ttf";
}
else if (face == L"Sans")
{
fname += L"arial.ttf";
}
else
{
throw runtime_exception(L"Unable to determine font file name for '%ls'", face.w_string());
}
#else
#error Font name lookup unimplemented!
#endif
//
ttf_font_ptr = TTF_OpenFont(fname.c_string(), size);
if (!ttf_font_ptr)
throw runtime_exception(L"Unable to load font '%ls': %hs", face.w_string(), TTF_GetError());
//
font_height = TTF_FontHeight(static_cast<TTF_Font *>(ttf_font_ptr));
font_ascent = TTF_FontAscent(static_cast<TTF_Font *>(ttf_font_ptr));
texture_height = nearest_power_2(font_height);
} // font_impl::font_impl()
