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feat: rendering pages on demand

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MihailRis 2026-02-16 01:42:48 +03:00
parent 381cb77d08
commit 47809b4024
9 changed files with 106 additions and 39 deletions
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46
src/coders/vector_fonts.cpp
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@ -25,7 +25,8 @@ static const char* get_ft_error_message(FT_Error error) {
}
namespace {
class FTFontFile : public vector_fonts::FontFile {
class FTFontFile : public vector_fonts::FontFile,
public std::enable_shared_from_this<FTFontFile> {
public:
FTFontFile(FT_Face face, util::Buffer<ubyte> buffer)
: face(std::move(face)), buffer(std::move(buffer)) {
@ -47,20 +48,42 @@ namespace {
}
std::vector<std::unique_ptr<Texture>> pages;
std::vector<Font::Glyph> glyphs;
std::vector<Glyph> glyphs;
int dstSize = size * 16;
ImageData canvas(ImageFormat::RGBA8888, dstSize, dstSize);
ImageData bitmapDst(ImageFormat::RGBA8888, size, size);
for (int pageid = 0; pageid < FONT_PAGES; pageid++) {
for (int pageid = 0; pageid < DEFAULT_PRE_RENDER_FONT_PAGES; pageid++) {
renderPage(pageid, canvas, bitmapDst, glyphs);
pages.push_back(Texture::from(&canvas));
}
return std::make_unique<Font>(
std::move(pages), std::move(glyphs), size, size / 2
std::move(pages),
std::move(glyphs),
size,
size / 2,
shared_from_this()
);
}
std::unique_ptr<Texture> renderPage(
int pageid, std::vector<Glyph>& glyphs, int size
) override {
if (FT_Error error = FT_Set_Pixel_Sizes(face, 0, size)) {
throw std::runtime_error(
"FT_Set_Pixel_Sizes error: " +
std::string(get_ft_error_message(error))
);
}
int dstSize = size * 16;
ImageData canvas(ImageFormat::RGBA8888, dstSize, dstSize);
ImageData bitmapDst(ImageFormat::RGBA8888, size, size);
renderPage(pageid, canvas, bitmapDst, glyphs);
return Texture::from(&canvas);
}
private:
FT_Face face;
util::Buffer<ubyte> buffer;
@ -95,19 +118,19 @@ namespace {
int pageid,
ImageData& canvas,
ImageData& bitmapDst,
std::vector<Font::Glyph>& glyphs
std::vector<Glyph>& glyphs
) {
int size = canvas.getWidth() / 16;
for (int c = 0; c < 256; c++) {
int codepoint = pageid << 8 | c;
if (!renderGlyph(codepoint, bitmapDst)) {
glyphs.push_back(Font::Glyph {0, size / 2});
glyphs.push_back(Glyph {0, size / 2});
continue;
}
canvas.blit(bitmapDst, (c % 16) * size, (c / 16) * size);
Font::Glyph glyph {
Glyph glyph {
face->glyph->bitmap_top - size,
static_cast<int>(face->glyph->advance.x >> 6)
};
@ -133,11 +156,14 @@ void vector_fonts::initialize() {
void vector_fonts::finalize() {
if (FT_Error error = FT_Done_FreeType(library)) {
logger.error() << "error on FT_Done_FreeType: " << get_ft_error_message(error);
logger.error() << "error on FT_Done_FreeType: "
<< get_ft_error_message(error);
}
}
std::unique_ptr<vector_fonts::FontFile> vector_fonts::load_font(const std::string& filename) {
std::shared_ptr<vector_fonts::FontFile> vector_fonts::load_font(
const std::string& filename
) {
auto bytes = io::read_bytes_buffer(io::path(filename));
FT_Face face;
@ -150,5 +176,5 @@ std::unique_ptr<vector_fonts::FontFile> vector_fonts::load_font(const std::strin
);
}
return std::make_unique<FTFontFile>(std::move(face), std::move(bytes));
return std::make_shared<FTFontFile>(std::move(face), std::move(bytes));
}