mirror of https://github.com/polybar/polybar.git
359 lines
9.6 KiB
C++
359 lines
9.6 KiB
C++
#pragma once
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#include <cairo/cairo-xcb.h>
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#include <algorithm>
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#include <cmath>
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#include <deque>
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#include "cairo/font.hpp"
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#include "cairo/surface.hpp"
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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 "components/types.hpp"
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#include "errors.hpp"
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#include "utils/color.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 Cairo context
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*/
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class context {
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public:
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explicit context(const surface& surface, const logger& log) : m_c(cairo_create(surface)), m_log(log) {
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auto status = cairo_status(m_c);
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if (status != CAIRO_STATUS_SUCCESS) {
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throw application_error(sstream() << "cairo_status(): " << cairo_status_to_string(status));
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}
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cairo_set_antialias(m_c, CAIRO_ANTIALIAS_GOOD);
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}
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virtual ~context() {
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cairo_destroy(m_c);
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}
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operator cairo_t*() const {
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return m_c;
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}
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context& operator<<(const surface& s) {
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cairo_set_source_surface(m_c, s, 0.0, 0.0);
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return *this;
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}
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context& operator<<(cairo_operator_t o) {
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cairo_set_operator(m_c, o);
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return *this;
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}
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context& operator<<(cairo_pattern_t* s) {
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cairo_set_source(m_c, s);
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return *this;
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}
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context& operator<<(const unsigned int& c) {
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// clang-format off
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cairo_set_source_rgba(m_c,
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color_util::red_channel<unsigned char>(c) / 255.0,
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color_util::green_channel<unsigned char>(c) / 255.0,
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color_util::blue_channel<unsigned char>(c) / 255.0,
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color_util::alpha_channel<unsigned char>(c) / 255.0);
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// clang-format on
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return *this;
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}
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context& operator<<(const abspos& p) {
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if (p.clear) {
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cairo_new_path(m_c);
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}
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cairo_move_to(m_c, p.x, p.y);
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return *this;
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}
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context& operator<<(const relpos& p) {
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cairo_rel_move_to(m_c, p.x, p.y);
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return *this;
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}
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context& operator<<(const rgba& f) {
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cairo_set_source_rgba(m_c, f.r, f.g, f.b, f.a);
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return *this;
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}
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context& operator<<(const rect& f) {
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cairo_rectangle(m_c, f.x, f.y, f.w, f.h);
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return *this;
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}
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context& operator<<(const line& l) {
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struct line p {
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l.x1, l.y1, l.x2, l.y2, l.w
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};
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snap(&p.x1, &p.y1);
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snap(&p.x2, &p.y2);
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cairo_move_to(m_c, p.x1, p.y1);
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cairo_line_to(m_c, p.x2, p.y2);
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cairo_set_line_width(m_c, p.w);
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cairo_stroke(m_c);
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return *this;
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}
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context& operator<<(const translate& d) {
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cairo_translate(m_c, d.x, d.y);
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return *this;
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}
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context& operator<<(const linear_gradient& l) {
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if (l.steps.size() >= 2) {
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auto pattern = cairo_pattern_create_linear(l.x1, l.y1, l.x2, l.y2);
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*this << pattern;
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auto stops = l.steps.size();
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auto step = 1.0 / (stops - 1);
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auto offset = 0.0;
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for (auto&& color : l.steps) {
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// clang-format off
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cairo_pattern_add_color_stop_rgba(pattern, offset,
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color_util::red_channel<unsigned char>(color) / 255.0,
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color_util::green_channel<unsigned char>(color) / 255.0,
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color_util::blue_channel<unsigned char>(color) / 255.0,
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color_util::alpha_channel<unsigned char>(color) / 255.0);
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// clang-format on
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offset += step;
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}
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cairo_pattern_destroy(pattern);
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}
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return *this;
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}
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context& operator<<(const rounded_corners& c) {
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double d = M_PI / 180.0;
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cairo_new_sub_path(m_c);
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cairo_arc(m_c, c.x + c.w - c.radius.top, c.y + c.radius.top, c.radius.top, -90 * d, 0 * d);
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cairo_arc(m_c, c.x + c.w - c.radius.bottom, c.y + c.h - c.radius.bottom, c.radius.bottom, 0 * d, 90 * d);
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cairo_arc(m_c, c.x + c.radius.bottom, c.y + c.h - c.radius.bottom, c.radius.bottom, 90 * d, 180 * d);
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cairo_arc(m_c, c.x + c.radius.top, c.y + c.radius.top, c.radius.top, 180 * d, 270 * d);
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cairo_close_path(m_c);
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return *this;
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}
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context& operator<<(const textblock& t) {
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double x, y;
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position(&x, &y);
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// Prioritize the preferred font
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vector<shared_ptr<font>> fns(m_fonts.begin(), m_fonts.end());
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if (t.font > 0 && t.font <= std::distance(fns.begin(), fns.end())) {
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std::iter_swap(fns.begin(), fns.begin() + t.font - 1);
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}
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string utf8 = string(t.contents);
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utils::unicode_charlist chars;
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utils::utf8_to_ucs4((const unsigned char*)utf8.c_str(), chars);
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while (!chars.empty()) {
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auto remaining = chars.size();
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for (auto&& f : fns) {
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unsigned int matches = 0;
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// Match as many glyphs as possible if the default/preferred font
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// is being tested. Otherwise test one glyph at a time against
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// the remaining fonts. Roll back to the top of the font list
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// when a glyph has been found.
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if (f == fns.front() && (matches = f->match(chars)) == 0) {
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continue;
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} else if (f != fns.front() && (matches = f->match(chars.front())) == 0) {
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continue;
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}
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string subset;
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auto end = chars.begin();
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while (matches-- && end != chars.end()) {
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subset += utf8.substr(end->offset, end->length);
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end++;
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}
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// Use the font
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f->use();
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// Get subset extents
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cairo_text_extents_t extents;
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f->textwidth(subset, &extents);
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// Draw the background
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if (t.bg_rect.h != 0.0) {
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save();
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cairo_set_operator(m_c, t.bg_operator);
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*this << t.bg;
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cairo_rectangle(m_c, t.bg_rect.x + *t.x_advance, t.bg_rect.y + *t.y_advance,
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t.bg_rect.w + extents.x_advance, t.bg_rect.h);
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cairo_fill(m_c);
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restore();
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}
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// Render subset
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auto fontextents = f->extents();
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f->render(subset, x, y - (fontextents.descent / 2 - fontextents.height / 4) + f->offset());
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// Get updated position
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position(&x, nullptr);
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// Increase position
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*t.x_advance += extents.x_advance;
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*t.y_advance += extents.y_advance;
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chars.erase(chars.begin(), end);
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break;
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}
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if (chars.empty()) {
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break;
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} else if (remaining != chars.size()) {
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continue;
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}
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char unicode[6]{'\0'};
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utils::ucs4_to_utf8(unicode, chars.begin()->codepoint);
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m_log.warn("Dropping unmatched character %s (U+%04x)", unicode, chars.begin()->codepoint);
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utf8.erase(chars.begin()->offset, chars.begin()->length);
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for (auto&& c : chars) {
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c.offset -= chars.begin()->length;
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}
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chars.erase(chars.begin(), ++chars.begin());
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}
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return *this;
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}
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context& operator<<(shared_ptr<font>&& f) {
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m_fonts.emplace_back(forward<decltype(f)>(f));
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return *this;
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}
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context& save(bool save_point = false) {
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if (save_point) {
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m_points.emplace_front(make_pair<double, double>(0.0, 0.0));
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position(&m_points.front().first, &m_points.front().second);
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}
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m_activegroups++;
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cairo_save(m_c);
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return *this;
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}
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context& restore(bool restore_point = false) {
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if (!m_activegroups) {
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throw application_error("Unmatched calls to save/restore");
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}
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m_activegroups--;
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cairo_restore(m_c);
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if (restore_point && !m_points.empty()) {
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*this << abspos{m_points.front().first, m_points.front().first};
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m_points.pop_front();
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}
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return *this;
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}
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context& paint() {
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cairo_paint(m_c);
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return *this;
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}
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context& paint(double alpha) {
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cairo_paint_with_alpha(m_c, alpha);
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return *this;
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}
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context& fill(bool preserve = false) {
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if (preserve) {
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cairo_fill_preserve(m_c);
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} else {
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cairo_fill(m_c);
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}
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return *this;
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}
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context& mask(cairo_pattern_t* pattern) {
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cairo_mask(m_c, pattern);
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return *this;
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}
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context& pop(cairo_pattern_t** pattern) {
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*pattern = cairo_pop_group(m_c);
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return *this;
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}
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context& push() {
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cairo_push_group(m_c);
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return *this;
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}
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context& destroy(cairo_pattern_t** pattern) {
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cairo_pattern_destroy(*pattern);
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*pattern = nullptr;
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return *this;
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}
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context& clear(bool paint = true) {
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cairo_save(m_c);
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cairo_set_operator(m_c, CAIRO_OPERATOR_CLEAR);
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if (paint) {
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cairo_paint(m_c);
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} else {
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cairo_fill_preserve(m_c);
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}
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cairo_restore(m_c);
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return *this;
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}
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context& clip(bool preserve = false) {
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if (preserve) {
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cairo_clip_preserve(m_c);
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} else {
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cairo_clip(m_c);
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cairo_new_path(m_c);
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}
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return *this;
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}
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context& clip(const rect& r) {
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*this << r;
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return clip();
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}
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context& reset_clip() {
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cairo_reset_clip(m_c);
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return *this;
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}
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context& position(double* x, double* y = nullptr) {
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if (cairo_has_current_point(m_c)) {
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double x_, y_;
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x = x != nullptr ? x : &x_;
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y = y != nullptr ? y : &y_;
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cairo_get_current_point(m_c, x, y);
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}
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return *this;
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}
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context& snap(double* x, double* y) {
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cairo_user_to_device(m_c, x, y);
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*x = static_cast<int>(*x + 0.5);
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*y = static_cast<int>(*y + 0.5);
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return *this;
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}
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protected:
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cairo_t* m_c;
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const logger& m_log;
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vector<shared_ptr<font>> m_fonts;
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std::deque<pair<double, double>> m_points;
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int m_activegroups{0};
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};
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}
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POLYBAR_NS_END
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