285 lines
7.7 KiB
C++
285 lines
7.7 KiB
C++
#include <pd/core/core.hpp>
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#include <pd/drivers/gfx.hpp>
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#include <pd/lithium/drawlist.hpp>
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#include <pd/lithium/font.hpp>
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#include <pd/lithium/math.hpp>
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#define STB_TRUETYPE_IMPLEMENTATION
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#include <stb_truetype.h>
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#include <map>
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namespace PD {
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namespace Li {
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PD_API void Font::LoadTTF(const std::string& path, int px_height) {
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/**
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* Just use LoadFile2Mem which looks way cleaner
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* and helps not having the font loading code twice
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* when adding LoadTTF with mem support
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*/
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PDLOG("Font: Loading {}...", path);
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TT::Scope st("LI_LoadTTF_" + path);
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auto font = PD::IO::LoadFile2Mem(path);
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PDLOG("Font Size: {}", PD::Strings::FormatBytes(font.size()));
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LoadTTF(font, px_height);
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}
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PD_API void Font::LoadTTF(const std::vector<u8>& data, int px_height) {
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/**
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* Some additional Info:
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* Removed the stbtt get bitmapbox as we dont need to place
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* the glyps nicely in the tex. next step would be using the free
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* space on the y axis to get mor glyphs inside
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*/
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PixelHeight = px_height;
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int texszs = PD::Bits::GetPow2(px_height * 16);
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if (texszs > 1024) {
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texszs = 1024; // Max size
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}
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stbtt_fontinfo inf;
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if (!stbtt_InitFont(&inf, data.data(), 0)) {
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return;
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}
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float scale = stbtt_ScaleForPixelHeight(&inf, PixelHeight);
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int ascent, descent, lineGap;
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stbtt_GetFontVMetrics(&inf, &ascent, &descent, &lineGap);
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int baseline = static_cast<int>(ascent * scale);
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// Cache to not render same codepoint tex twice
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std::map<u32, int> buf_cache;
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std::vector<u8> font_tex(texszs * texszs * 4, 0);
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fvec2 off;
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bool empty = true;
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for (u32 ii = 0x0000; ii <= 0xFFFF; ii++) {
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int gi = stbtt_FindGlyphIndex(&inf, ii);
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if (gi == 0) continue;
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if (stbtt_IsGlyphEmpty(&inf, gi)) continue;
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int w = 0, h = 0, xo = 0, yo = 0;
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unsigned char* bitmap =
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stbtt_GetCodepointBitmap(&inf, scale, scale, ii, &w, &h, &xo, &yo);
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if (!bitmap || w <= 0 || h <= 0) {
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if (bitmap) free(bitmap);
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continue;
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}
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u32 hashed_map = IO::HashMemory(std::vector<u8>(bitmap, bitmap + (w * h)));
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if (buf_cache.find(hashed_map) != buf_cache.end()) {
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Codepoint c = GetCodepoint(buf_cache[hashed_map]);
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c.pCodepoint = ii;
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CodeMap[ii] = c;
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free(bitmap);
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continue;
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} else {
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buf_cache[hashed_map] = ii;
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}
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// Next row
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if (off.x + w > texszs) {
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off.y += PixelHeight;
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off.x = 0.0f;
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}
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// Bake cause we go out of the tex
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if (off.y + PixelHeight > texszs) {
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BakeAndPush(false, font_tex, texszs);
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off = 0;
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std::fill(font_tex.begin(), font_tex.end(), 0);
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empty = true;
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}
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// UVs & Codepoint
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Codepoint c;
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fvec4 uvs;
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// cast the ints to floats and not the floats...
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// dont know where my mind was when creating the code
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uvs.x = off.x / static_cast<float>(texszs);
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uvs.y = off.y / static_cast<float>(texszs);
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uvs.z = (off.x + w) / static_cast<float>(texszs);
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uvs.w = (off.y + h) / static_cast<float>(texszs);
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// Flip if needed
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if (PD::Gfx::GetFlags() & PDBackendFlags_FlipUV_Y) {
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uvs.y = 1.f - uvs.y;
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uvs.w = 1.f - uvs.w;
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}
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c.SimpleUV = uvs;
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c.Tex = pCurrentTex;
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c.Size = fvec2(w, h);
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c.Offset = baseline + yo;
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c.pCodepoint = ii;
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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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int map_pos = ((static_cast<int>(off.y) + y) * texszs +
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(static_cast<int>(off.x) + x)) *
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4;
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font_tex[map_pos + 0] = 255;
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font_tex[map_pos + 1] = 255;
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font_tex[map_pos + 2] = 255;
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font_tex[map_pos + 3] = bitmap[x + y * w];
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}
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}
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empty = false;
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CodeMap[ii] = c;
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free(bitmap);
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// offset by 1 (prevents visual glitches i had)
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off.x += w + 1;
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}
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if (!empty) {
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BakeAndPush(true, font_tex, texszs);
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}
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}
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PD_API void Font::LoadDefaultFont(int id, int pixel_height) {}
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PD_API Font::Codepoint& Font::GetCodepoint(u32 c) {
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// Check if codepoijt exist or return a static invalid one
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auto res = CodeMap.find(c);
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if (res == CodeMap.end()) {
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static Codepoint invalid;
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invalid.pInvalid = true;
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return invalid;
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}
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return res->second;
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}
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PD_API fvec2 Font::GetTextBounds(const char* text, float scale) {
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// Create a temp position and offset as [0, 0]
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fvec2 res;
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float x = 0;
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// Curent Font Scale
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float cfs = (DefaultPixelHeight * scale) / (float)PixelHeight;
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float lh = (float)PixelHeight * cfs;
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U8Iterator it(text);
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u32 c;
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while (it.Decode32(c)) {
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auto cp = GetCodepoint(c);
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if (cp.pInvalid && c != '\n' && c != '\t' && c != ' ') {
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continue;
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}
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switch (c) {
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case L'\n':
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res.y += lh;
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res.x = std::max(res.x, x);
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x = 0.f;
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break;
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case L'\t':
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x += 16 * cfs;
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break;
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case L' ':
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x += 4 * cfs;
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// Fall trough here to get the same result as in
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// TextCommand if/else Section
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default:
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x += cp.Size.x * cfs;
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// Omly passing c cause i know its not used
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if (it.PeekNext32(c)) {
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x += 2 * cfs;
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}
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break;
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}
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}
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res.x = std::max(res.x, x);
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res.y += lh;
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return res;
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}
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PD_API void Font::CmdTextEx(Drawlist& dl, const fvec2& pos, u32 color,
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float scale, const char* text, LiTextFlags flags,
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const fvec2& box) {
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fvec2 off;
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float cfs = (DefaultPixelHeight * scale) / (float)PixelHeight;
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float lh = (float)PixelHeight * cfs;
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fvec2 td;
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fvec2 rpos = pos;
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fvec2 rbox = box;
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if (flags & (LiTextFlags_AlignMid | LiTextFlags_AlignRight)) {
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td = GetTextBounds(text, scale);
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}
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if (flags & LiTextFlags_AlignMid) rpos = rbox * 0.5 - td * 0.5 + pos;
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if (flags & LiTextFlags_AlignRight) rpos.x -= td.x;
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U8Iterator it(text);
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u32 c;
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Command* cmd = nullptr;
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while (it.Decode32(c)) {
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auto cp = GetCodepoint(c);
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if ((cp.pInvalid && c != L'\n' && c != L'\t' && c != L' ') && c != L'\r')
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continue;
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if (c == L'\n') {
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off.y += lh;
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off.x = 0.f;
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continue;
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}
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if (c == L'\t') {
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off.x += 16 * cfs;
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continue;
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}
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if (c == L' ') {
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off.x += 4 * cfs;
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continue;
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}
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if (cmd == nullptr || cmd->Tex != Textures[cp.Tex]) {
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if (cp.Tex >= Textures.size()) continue;
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cmd = &dl.NewCommand();
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cmd->Tex = Textures[cp.Tex];
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}
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if (flags & LiTextFlags_Shaddow) {
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Rect rec = Math::PrimRect(rpos + off + fvec2(1, cp.Offset * cfs + 1),
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cp.Size * cfs, 0.f);
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dl.PrimQuad(*cmd, rec, cp.SimpleUV, 0xff111111);
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}
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Rect rec = Math::PrimRect(rpos + off + fvec2(0, cp.Offset * cfs),
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cp.Size * cfs, 0.f);
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dl.PrimQuad(*cmd, rec, cp.SimpleUV, color);
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off.x += cp.Size.x * cfs + 2 * cfs;
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}
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}
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PD_API void Font::CleanupTMS() {}
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PD_API void Font::BakeAndPush(bool final, std::vector<u8>& font_tex,
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int texszs) {
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auto t = PD::Gfx::LoadTexture(font_tex, texszs, texszs);
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PDLOG("Font: Texture backed as 0x{:X} at {}", t.GetID(), pCurrentTex);
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Textures.push_back(t.GetID());
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pCurrentTex = Textures.size();
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}
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PD_API std::string Font::pWrapText(const std::string& txt, float scale,
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const PD::fvec2& max, PD::fvec2& dim) {
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return "";
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}
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PD_API std::string Font::pShortText(const std::string& txt, float scale,
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const PD::fvec2& max, PD::fvec2& dim) {
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return "";
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}
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PD_API void Font::Delete() {
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for (auto& it : Textures) {
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// Creating a tmp fake Li tex for deletion
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PD::Gfx::DeleteTexture(PD::Li::Texture(it, 0));
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}
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pCurrentTex = 0;
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PixelHeight = 0;
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pTMS.clear();
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CodeMap.clear();
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}
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} // namespace Li
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} // namespace PD
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