342 lines
10 KiB
C++
342 lines
10 KiB
C++
#pragma once
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#include <cairo/cairo-ft.h>
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#include "cairo/types.hpp"
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#include "cairo/utils.hpp"
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#include "common.hpp"
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#include "components/logger.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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/**
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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 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(double dpi) const = 0;
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virtual cairo_font_extents_t extents() = 0;
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virtual void use() {
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cairo_set_font_face(m_cairo, cairo_font_face_reference(m_font_face));
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}
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virtual size_t match(utils::unicode_character& character) = 0;
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virtual size_t match(utils::unicode_charlist& charlist) = 0;
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virtual size_t render(const string& text, double x = 0.0, double y = 0.0) = 0;
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virtual void textwidth(const string& text, cairo_text_extents_t* extents) = 0;
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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, double dpi_x, double dpi_y)
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: 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(dpi_x), size(dpi_y));
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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<utils::ft_face_lock>(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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lock.reset();
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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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cairo_font_extents_t extents() override {
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cairo_scaled_font_extents(m_scaled, &m_extents);
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return m_extents;
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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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/**
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* Calculates the font size in pixels for the given dpi
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*
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* We use the two font properties size and pixelsize. size is in points and
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* needs to be scaled with the given dpi. pixelsize is not scaled.
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*
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* If both size properties are 0, we fall back to a default value of 10
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* points for scalable fonts or 10 pixel for non-scalable ones. This should
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* only happen if both properties are purposefully set to 0
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*
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* For scalable fonts we try to use the size property scaled according to
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* the dpi.
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* For non-scalable fonts we try to use the pixelsize property as-is
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*/
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double size(double dpi) const override {
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bool scalable;
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double fc_pixelsize = 0, fc_size = 0;
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property(FC_SCALABLE, &scalable);
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// Size in points
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property(FC_SIZE, &fc_size);
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// Size in pixels
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property(FC_PIXEL_SIZE, &fc_pixelsize);
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// Fall back to a default value if the size is 0
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double pixelsize = fc_pixelsize == 0 ? 10 : fc_pixelsize;
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double size = fc_size == 0 ? 10 : fc_size;
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// Font size in pixels if we use the pixelsize property
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int px_pixelsize = pixelsize + 0.5;
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/*
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* Font size in pixels if we use the size property. Since the size
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* specifies the font size in points, this is converted to pixels
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* according to the dpi given.
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* One point is 1/72 inches, thus this gives us the number of 'dots'
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* (or pixels) for this font
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*/
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int px_size = size / 72.0 * dpi + 0.5;
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if (fc_size == 0 && fc_pixelsize == 0) {
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return scalable ? px_size : px_pixelsize;
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}
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if (scalable) {
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/*
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* Use the point size if it's not 0. The pixelsize is only used if the
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* size property is 0 and pixelsize is not
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*/
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if (fc_size != 0) {
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return px_size;
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} else {
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return px_pixelsize;
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}
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} else {
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/*
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* Non-scalable fonts do it the other way around, here the size
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* property is only used if pixelsize is 0 and size is not
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*/
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if (fc_pixelsize != 0) {
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return px_pixelsize;
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} else {
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return px_size;
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}
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}
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}
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void use() override {
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cairo_set_scaled_font(m_cairo, m_scaled);
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}
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size_t match(utils::unicode_character& character) override {
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auto lock = make_unique<utils::ft_face_lock>(m_scaled);
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auto face = static_cast<FT_Face>(*lock);
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return FT_Get_Char_Index(face, character.codepoint) ? 1 : 0;
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}
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size_t match(utils::unicode_charlist& charlist) override {
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auto lock = make_unique<utils::ft_face_lock>(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, double x = 0.0, double y = 0.0) override {
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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(
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m_scaled, x, y, utf8.c_str(), 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_text_to_glyphs()" << 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 && bytes < text.size()) {
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cairo_glyph_free(glyphs);
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cairo_text_cluster_free(clusters);
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utf8 = text.substr(0, bytes);
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auto status = 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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if (status != CAIRO_STATUS_SUCCESS) {
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throw application_error(sstream() << "cairo_scaled_font_text_to_glyphs()" << cairo_status_to_string(status));
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}
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}
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if (bytes) {
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// auto lock = make_unique<utils::device_lock>(cairo_surface_get_device(cairo_get_target(m_cairo)));
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// if (lock.get()) {
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// cairo_glyph_path(m_cairo, glyphs, nglyphs);
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// }
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cairo_text_extents_t extents{};
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cairo_scaled_font_glyph_extents(m_scaled, glyphs, nglyphs, &extents);
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cairo_show_text_glyphs(m_cairo, utf8.c_str(), utf8.size(), glyphs, nglyphs, clusters, nclusters, cf);
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cairo_fill(m_cairo);
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cairo_move_to(m_cairo, x + extents.x_advance, 0.0);
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}
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cairo_glyph_free(glyphs);
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cairo_text_cluster_free(clusters);
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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(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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inline decltype(auto) make_font(cairo_t* cairo, string&& fontname, double offset, double dpi_x, double dpi_y) {
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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(&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 scope_util::on_exit fc_cleanup([] {
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FT_Done_FreeType(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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if (!pattern) {
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logger::make().err("Could not parse font \"%s\"", fontname);
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throw application_error("Could not parse font \"" + fontname + "\"");
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}
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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_shared<font_fc>(cairo, match, offset, dpi_x, dpi_y);
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}
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} // namespace cairo
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POLYBAR_NS_END
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