mirror of https://github.com/polybar/polybar.git
284 lines
7.7 KiB
C++
284 lines
7.7 KiB
C++
#pragma once
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#include <cairo/cairo-ft.h>
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#include <list>
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#include <set>
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#include <string>
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#include "common.hpp"
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#include "errors.hpp"
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#include "settings.hpp"
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#include "utils/math.hpp"
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#include "utils/scope.hpp"
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#include "utils/string.hpp"
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POLYBAR_NS
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namespace cairo {
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namespace details {
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/**
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* @brief Global pointer to the Freetype library handler
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*/
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static FT_Library g_ftlib;
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/**
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* @brief RAII wrapper used to access the underlying
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* FT_Face of a scaled font face
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*/
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class ft_face_lock {
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public:
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explicit ft_face_lock(cairo_scaled_font_t* font) : m_font(font) {
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m_face = cairo_ft_scaled_font_lock_face(m_font);
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}
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~ft_face_lock() {
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cairo_ft_scaled_font_unlock_face(m_font);
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}
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operator FT_Face() const {
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return m_face;
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}
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private:
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cairo_scaled_font_t* m_font;
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FT_Face m_face;
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};
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}
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/**
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* @brief Unicode character containing converted codepoint
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* and details on where its position in the source string
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*/
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struct unicode_character {
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explicit unicode_character() : codepoint(0), offset(0), length(0) {}
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unsigned long codepoint;
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int offset;
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int length;
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};
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using unicode_charlist = std::list<unicode_character>;
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/**
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* @brief Abstract font face
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*/
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class font {
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public:
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explicit font(cairo_t* cairo, double offset) : m_cairo(cairo), m_offset(offset) {}
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virtual ~font() {};
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virtual string name() const = 0;
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virtual string file() const = 0;
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virtual double offset() const = 0;
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virtual double size() const = 0;
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virtual void use(cairo_t* c) {
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cairo_set_font_face(c, cairo_font_face_reference(m_font_face));
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}
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virtual size_t match(unicode_charlist& charlist) = 0;
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virtual size_t render(const string& text) = 0;
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virtual void textwidth(const string& text, cairo_text_extents_t* extents) = 0;
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cairo_font_extents_t extents() const {
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return m_extents;
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}
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protected:
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cairo_t* m_cairo;
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cairo_font_face_t* m_font_face{nullptr};
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cairo_font_extents_t m_extents{};
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double m_offset{0.0};
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};
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/**
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* @brief Font based on fontconfig/freetype
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*/
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class font_fc : public font {
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public:
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explicit font_fc(cairo_t* cairo, FcPattern* pattern, double offset) : font(cairo, offset), m_pattern(pattern) {
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cairo_matrix_t fm;
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cairo_matrix_t ctm;
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cairo_matrix_init_scale(&fm, size(), size());
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cairo_get_matrix(m_cairo, &ctm);
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auto fontface = cairo_ft_font_face_create_for_pattern(m_pattern);
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auto opts = cairo_font_options_create();
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m_scaled = cairo_scaled_font_create(fontface, &fm, &ctm, opts);
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cairo_font_options_destroy(opts);
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cairo_font_face_destroy(fontface);
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auto status = cairo_scaled_font_status(m_scaled);
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if (status != CAIRO_STATUS_SUCCESS) {
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throw application_error(sstream() << "cairo_scaled_font_create(): " << cairo_status_to_string(status));
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}
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auto lock = make_unique<details::ft_face_lock>(cairo_scaled_font_reference(m_scaled));
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auto face = static_cast<FT_Face>(*lock);
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if (FT_Select_Charmap(face, FT_ENCODING_UNICODE) == FT_Err_Ok) {
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return;
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} else if (FT_Select_Charmap(face, FT_ENCODING_BIG5) == FT_Err_Ok) {
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return;
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} else if (FT_Select_Charmap(face, FT_ENCODING_SJIS) == FT_Err_Ok) {
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return;
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}
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}
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~font_fc() override {
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if (m_scaled != nullptr) {
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cairo_scaled_font_destroy(m_scaled);
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}
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if (m_pattern != nullptr) {
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FcPatternDestroy(m_pattern);
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}
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}
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string name() const override {
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return property("family");
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}
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string file() const override {
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return property("file");
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}
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double offset() const override {
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return m_offset;
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}
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double size() const override {
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bool scalable;
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double px;
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property(FC_SCALABLE, &scalable);
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if (scalable) {
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property(FC_SIZE, &px);
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} else {
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property(FC_PIXEL_SIZE, &px);
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px = static_cast<int>(px + 0.5);
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}
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return px;
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}
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void use(cairo_t* c) override {
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cairo_set_scaled_font(c, cairo_scaled_font_reference(m_scaled));
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}
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size_t match(unicode_charlist& charlist) override {
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auto lock = make_unique<details::ft_face_lock>(cairo_scaled_font_reference(m_scaled));
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auto face = static_cast<FT_Face>(*lock);
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size_t available_chars = 0;
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for (auto&& c : charlist) {
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if (FT_Get_Char_Index(face, c.codepoint)) {
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available_chars++;
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} else {
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break;
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}
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}
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return available_chars;
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}
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size_t render(const string& text) override {
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double x, y;
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cairo_get_current_point(m_cairo, &x, &y);
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cairo_glyph_t* glyphs{nullptr};
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cairo_text_cluster_t* clusters{nullptr};
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cairo_text_cluster_flags_t cf{};
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int nglyphs = 0, nclusters = 0;
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string utf8 = string(text);
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auto status = cairo_scaled_font_text_to_glyphs(cairo_scaled_font_reference(m_scaled), x, y, utf8.c_str(),
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utf8.size(), &glyphs, &nglyphs, &clusters, &nclusters, &cf);
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if (status != CAIRO_STATUS_SUCCESS) {
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throw application_error(sstream() << "cairo_scaled_font_status()" << cairo_status_to_string(status));
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}
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size_t bytes = 0;
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for (int g = 0; g < nglyphs; g++) {
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if (glyphs[g].index) {
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bytes += clusters[g].num_bytes;
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} else {
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break;
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}
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}
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if (bytes) {
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utf8 = text.substr(0, bytes);
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cairo_scaled_font_text_to_glyphs(
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m_scaled, x, y, utf8.c_str(), utf8.size(), &glyphs, &nglyphs, &clusters, &nclusters, &cf);
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cairo_show_text_glyphs(m_cairo, utf8.c_str(), utf8.size(), glyphs, nglyphs, clusters, nclusters, cf);
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}
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return bytes;
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}
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void textwidth(const string& text, cairo_text_extents_t* extents) override {
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cairo_scaled_font_text_extents(cairo_scaled_font_reference(m_scaled), text.c_str(), extents);
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}
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protected:
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string property(string&& property) const {
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FcChar8* file;
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if (FcPatternGetString(m_pattern, property.c_str(), 0, &file) == FcResultMatch) {
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return string(reinterpret_cast<char*>(file));
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} else {
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return "";
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}
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}
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void property(string&& property, bool* dst) const {
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FcBool b;
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FcPatternGetBool(m_pattern, property.c_str(), 0, &b);
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*dst = b;
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}
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void property(string&& property, double* dst) const {
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FcPatternGetDouble(m_pattern, property.c_str(), 0, dst);
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}
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void property(string&& property, int* dst) const {
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FcPatternGetInteger(m_pattern, property.c_str(), 0, dst);
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}
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private:
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cairo_scaled_font_t* m_scaled{nullptr};
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FcPattern* m_pattern{nullptr};
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};
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/**
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* Match and create font from given fontconfig pattern
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*/
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decltype(auto) make_font(cairo_t* cairo, string&& fontname, double offset) {
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static bool fc_init{false};
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if (!fc_init && !(fc_init = FcInit())) {
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throw application_error("Could not load fontconfig");
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} else if (FT_Init_FreeType(&details::g_ftlib) != FT_Err_Ok) {
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throw application_error("Could not load FreeType");
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}
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static auto fc_cleanup = scope_util::make_exit_handler([] {
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FT_Done_FreeType(details::g_ftlib);
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FcFini();
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});
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auto pattern = FcNameParse((FcChar8*)fontname.c_str());
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FcDefaultSubstitute(pattern);
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FcConfigSubstitute(nullptr, pattern, FcMatchPattern);
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FcResult result;
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FcPattern* match = FcFontMatch(nullptr, pattern, &result);
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FcPatternDestroy(pattern);
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if (match == nullptr) {
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throw application_error("Could not load font \"" + fontname + "\"");
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}
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#ifdef DEBUG_FONTCONFIG
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FcPatternPrint(match);
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#endif
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return make_unique<font_fc>(cairo, match, offset);
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}
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}
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POLYBAR_NS_END
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