73 lines
1.5 KiB
C++
73 lines
1.5 KiB
C++
#pragma once
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#include <cstdint>
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#include <fstream>
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#include <memory>
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#include <string>
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#include "thirdparty/stb_truetype.h"
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#include "common.h"
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#include "iAllocator.h"
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#include "Rasterbuffer.h"
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namespace gj {
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class Font {
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public:
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Font() = delete;
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Font(Font&&) = delete;
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Font(const Font&) = delete;
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Font& operator=(Font&&) = delete;
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Font& operator=(const Font&) = delete;
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Font(iAllocator* alloc, const std::string& path) : alloc_(alloc) {
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std::ifstream ifs(path, std::ios::binary);
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if (!ifs) {
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Abort("failed to open: "+path);
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}
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ifs.seekg(0, std::ios::end);
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const size_t size = ifs.tellg();
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ifs.seekg(0);
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buf_ = alloc_->MakeUniqArray<uint8_t>(size);
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ifs.read(reinterpret_cast<char*>(buf_.get()), size);
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const int offset = stbtt_GetFontOffsetForIndex(buf_.get(), 0);
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if (!stbtt_InitFont(&stb_, buf_.get(), offset)) {
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Abort("invalid font: "+path);
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}
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}
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Colorbuffer&& RenderGlyph(char16_t c, uint32_t fontsize = 32) {
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int w, h;
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const float s = stbtt_ScaleForPixelHeight(&stb_, fontsize*1.f);
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const uint8_t* src = stbtt_GetCodepointBitmap(&stb_, 0, s, c, &w, &h, 0, 0);
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Colorbuffer ret(alloc_, w, h);
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float* dst = ret.ptr();
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for (int y = 0; y < h; ++y) {
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for (int x = 0; x < w; ++x) {
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*dst = static_cast<float>(*src*1./UINT8_MAX);
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++dst, ++src;
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}
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}
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return std::move(ret);
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}
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private:
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iAllocator* alloc_;
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stbtt_fontinfo stb_;
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UniqPtr<uint8_t> buf_;
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};
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} |