STBTTFontEssence(
BitmapGlyphRenderingBase& parent,
TextureUnitSelector bitmap_tex_unit,
TextureUnitSelector metric_tex_unit,
TextureUnitSelector pg_map_tex_unit,
const std::string& font_name,
GLsizei frames,
GLint default_page,
GLuint pixel_height
): _parent(parent)
, _tt_font(std::ifstream(_page_font_path(font_name), std::ios::binary))
, _font_resolution(pixel_height)
, _tex_side(BitmapGlyphDefaultPageTexSide(parent, _font_resolution))
, _pager(
parent,
pg_map_tex_unit,
frames
), _initial_frame(_pager.FindFrame())
, _page_storage(
parent,
bitmap_tex_unit,
metric_tex_unit,
_initial_frame,
frames,
_make_page_bitmap(default_page),
_make_page_metric(default_page)
)
{
_pager.SwapPageIn(_initial_frame, default_page);
}
BitmapGlyphFontEssence(
BitmapGlyphRenderingBase& parent,
TextureUnitSelector bitmap_tex_unit,
TextureUnitSelector metric_tex_unit,
TextureUnitSelector pg_map_tex_unit,
const std::string& font_name,
SizeType frames,
GLuint default_page,
GLuint /* pixel_height*/
): _parent(parent)
, _font_name(font_name)
, _pager(
parent,
pg_map_tex_unit,
frames
), _initial_frame(_pager.FindFrame())
, _page_storage(
parent,
bitmap_tex_unit,
metric_tex_unit,
_initial_frame,
frames,
_load_page_bitmap(default_page),
_load_page_metric(default_page)
)
{
_pager.SwapPageIn(_initial_frame, default_page);
}
void _do_load_pages(
PageGetter get_page,
const Element* elem,
GLsizei size
)
{
_page_storage.Bind();
// go through the list of code-points
for(GLsizei i=0; i!=size; ++i)
{
// get the page number for the glyph
GLuint page = get_page(elem[i]);
// check if the page is active
if(!_pager.UsePage(page))
{
// if not let the pager find
// a frame for the new page
auto frame = _pager.FindFrame();
// load the bitmap image
_page_storage.LoadPage(
frame,
_load_page_bitmap(page),
_load_page_metric(page)
);
// tell the pages that the page
// is successfully loaded in the frame
_pager.SwapPageIn(frame, page);
}
}
}
void _do_load_pages(
const Element* elem,
GLsizei size
)
{
_page_storage.Bind();
// go through the list of code-points
for(GLsizei i=0; i!=size; ++i)
{
// get the page number for the glyph
GLint page = elem[i];
// check if the page is active
if(!_pager.UsePage(page))
{
// if not let the pager find
// a frame for the new page
auto frame = _pager.FindFrame();
// load the bitmap image
unsigned glyphs_per_page =
BitmapGlyphGlyphsPerPage(_parent);
std::vector<unsigned char>
bmp(_tex_side*_tex_side);
std::vector<GLfloat>
metrics(glyphs_per_page*12);
_do_make_page_bitmap_and_metric(
page,
bmp.data(),
metrics.data()
);
_page_storage.LoadPage(
frame,
images::Image(
_tex_side,
_tex_side,
1,
1,
bmp.data(),
PixelDataFormat::Red,
PixelDataInternalFormat::R8
),
metrics
);
// tell the pager that the page
// is successfully loaded in the frame
_pager.SwapPageIn(frame, page);
}
}
}
void LoadPages(const GLint* pages, GLsizei size)
{
assert(size < GLsizei(_pager.FrameCount()));
_do_load_pages(pages, size);
}
TextureUnitSelector PageMapTexUnit(void) const
{
return _pager.PageMapTexUnit();
}
void Use(void) const
{
_pager.Bind();
_page_storage.Bind();
}
void LoadPages(const GLuint* pages, SizeType size)
{
assert(size < GLsizei(_pager.FrameCount()));
_do_load_pages(_page_to_page(), pages, size);
}
