hyprland/src/debug/HyprNotificationOverlay.cpp

#include "HyprNotificationOverlay.hpp"
#include "../Compositor.hpp"
#include <pango/pangocairo.h>

CHyprNotificationOverlay::CHyprNotificationOverlay() {
    g_pHookSystem->hookDynamic("focusedMon", [&](void* self, std::any param) {
        if (m_dNotifications.size() == 0)
            return;

        g_pHyprRenderer->damageBox(&m_bLastDamage);
    });

    // check for the icon backend
    std::string fonts      = execAndGet("fc-list");
    std::string fontsLower = fonts;
    std::transform(fontsLower.begin(), fontsLower.end(), fontsLower.begin(), [&](char& i) { return std::tolower(i); });

    size_t index = 0;

    if (index = fontsLower.find("nerd"); index != std::string::npos) {
        m_eIconBackend = ICONS_BACKEND_NF;
    } else if (index = fontsLower.find("font awesome"); index != std::string::npos) {
        m_eIconBackend = ICONS_BACKEND_FA;
    } else if (index = fontsLower.find("fontawesome"); index != std::string::npos) {
        m_eIconBackend = ICONS_BACKEND_FA;
    } else {
        return;
    }

    const auto LASTNEWLINE = fonts.find_last_of('\n', index);
    const auto COLON       = fonts.find(':', LASTNEWLINE);
    const auto COMMA       = fonts.find(',', COLON);
    const auto NEWLINE     = fonts.find('\n', COLON);
    const auto LASTCHAR    = COMMA < NEWLINE ? COMMA : NEWLINE;

    m_szIconFontName = fonts.substr(COLON + 2, LASTCHAR - (COLON + 2));
}

void CHyprNotificationOverlay::addNotification(const std::string& text, const CColor& color, const float timeMs, const eIcons icon) {
    const auto PNOTIF = m_dNotifications.emplace_back(std::make_unique<SNotification>()).get();

    PNOTIF->text  = text;
    PNOTIF->color = color == CColor(0) ? ICONS_COLORS[icon] : color;
    PNOTIF->started.reset();
    PNOTIF->timeMs = timeMs;
    PNOTIF->icon   = icon;
}

wlr_box CHyprNotificationOverlay::drawNotifications(CMonitor* pMonitor) {
    static constexpr auto ANIM_DURATION_MS   = 600.0;
    static constexpr auto ANIM_LAG_MS        = 100.0;
    static constexpr auto NOTIF_LEFTBAR_SIZE = 5.0;
    static constexpr auto ICON_PAD           = 3.0;
    static constexpr auto ICON_SCALE         = 0.9;
    static constexpr auto GRADIENT_SIZE      = 60.0;

    float                 offsetY  = 10;
    float                 maxWidth = 0;

    const auto            SCALE    = pMonitor->scale;
    const auto            FONTSIZE = std::clamp((int)(13.f * ((pMonitor->vecPixelSize.x * SCALE) / 1920.f)), 8, 40);

    const auto            MONSIZE = pMonitor->vecPixelSize;

    cairo_text_extents_t  cairoExtents;
    int                   iconW = 0, iconH = 0;

    PangoLayout*          pangoLayout;
    PangoFontDescription* pangoFD;

    pangoLayout = pango_cairo_create_layout(m_pCairo);
    pangoFD     = pango_font_description_from_string(("Sans " + std::to_string(FONTSIZE * ICON_SCALE)).c_str());
    pango_layout_set_font_description(pangoLayout, pangoFD);

    cairo_select_font_face(m_pCairo, "Sans", CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL);
    cairo_set_font_size(m_pCairo, FONTSIZE);

    const auto PBEZIER = g_pAnimationManager->getBezier("default");

    for (auto& notif : m_dNotifications) {
        const auto ICONPADFORNOTIF = notif->icon == ICON_NONE ? 0 : ICON_PAD;

        // first rect (bg, col)
        const float FIRSTRECTANIMP =
            (notif->started.getMillis() > (ANIM_DURATION_MS - ANIM_LAG_MS) ?
                 (notif->started.getMillis() > notif->timeMs - (ANIM_DURATION_MS - ANIM_LAG_MS) ? notif->timeMs - notif->started.getMillis() : (ANIM_DURATION_MS - ANIM_LAG_MS)) :
                 notif->started.getMillis()) /
            (ANIM_DURATION_MS - ANIM_LAG_MS);

        const float FIRSTRECTPERC = FIRSTRECTANIMP >= 0.99f ? 1.f : PBEZIER->getYForPoint(FIRSTRECTANIMP);

        // second rect (fg, black)
        const float SECONDRECTANIMP = (notif->started.getMillis() > ANIM_DURATION_MS ?
                                           (notif->started.getMillis() > notif->timeMs - ANIM_DURATION_MS ? notif->timeMs - notif->started.getMillis() : ANIM_DURATION_MS) :
                                           notif->started.getMillis()) /
            ANIM_DURATION_MS;

        const float SECONDRECTPERC = SECONDRECTANIMP >= 0.99f ? 1.f : PBEZIER->getYForPoint(SECONDRECTANIMP);

        // third rect (horiz, col)
        const float THIRDRECTPERC = notif->started.getMillis() / notif->timeMs;

        // get text size
        cairo_text_extents(m_pCairo, notif->text.c_str(), &cairoExtents);
        const auto ICON      = ICONS_ARRAY[m_eIconBackend][notif->icon];
        const auto ICONCOLOR = ICONS_COLORS[notif->icon];
        pango_layout_set_text(pangoLayout, ICON.c_str(), -1);
        pango_layout_set_font_description(pangoLayout, pangoFD);
        pango_cairo_update_layout(m_pCairo, pangoLayout);
        pango_layout_get_size(pangoLayout, &iconW, &iconH);
        iconW /= PANGO_SCALE;
        iconH /= PANGO_SCALE;

        cairo_set_source_rgba(m_pCairo, notif->color.r, notif->color.g, notif->color.b, notif->color.a);

        const auto NOTIFSIZE = Vector2D{cairoExtents.width + 20 + iconW + 2 * ICONPADFORNOTIF, cairoExtents.height + 10};

        // draw rects
        cairo_rectangle(m_pCairo, MONSIZE.x - (NOTIFSIZE.x + NOTIF_LEFTBAR_SIZE) * FIRSTRECTPERC, offsetY, (NOTIFSIZE.x + NOTIF_LEFTBAR_SIZE) * FIRSTRECTPERC, NOTIFSIZE.y);
        cairo_fill(m_pCairo);

        cairo_set_source_rgb(m_pCairo, 0.f, 0.f, 0.f);

        cairo_rectangle(m_pCairo, MONSIZE.x - NOTIFSIZE.x * SECONDRECTPERC, offsetY, NOTIFSIZE.x * SECONDRECTPERC, NOTIFSIZE.y);
        cairo_fill(m_pCairo);

        cairo_set_source_rgba(m_pCairo, notif->color.r, notif->color.g, notif->color.b, notif->color.a);

        cairo_rectangle(m_pCairo, MONSIZE.x - NOTIFSIZE.x * SECONDRECTPERC + 3, offsetY + NOTIFSIZE.y - 4, THIRDRECTPERC * (NOTIFSIZE.x - 6), 2);
        cairo_fill(m_pCairo);

        // draw gradient
        if (notif->icon != ICON_NONE) {
            cairo_pattern_t* pattern;
            pattern = cairo_pattern_create_linear(MONSIZE.x - (NOTIFSIZE.x + NOTIF_LEFTBAR_SIZE) * FIRSTRECTPERC, offsetY,
                                                  MONSIZE.x - (NOTIFSIZE.x + NOTIF_LEFTBAR_SIZE) * FIRSTRECTPERC + GRADIENT_SIZE, offsetY);
            cairo_pattern_add_color_stop_rgba(pattern, 0, ICONCOLOR.r, ICONCOLOR.g, ICONCOLOR.b, ICONCOLOR.a / 3.0);
            cairo_pattern_add_color_stop_rgba(pattern, 1, ICONCOLOR.r, ICONCOLOR.g, ICONCOLOR.b, 0);
            cairo_rectangle(m_pCairo, MONSIZE.x - (NOTIFSIZE.x + NOTIF_LEFTBAR_SIZE) * FIRSTRECTPERC, offsetY, GRADIENT_SIZE, NOTIFSIZE.y);
            cairo_set_source(m_pCairo, pattern);
            cairo_fill(m_pCairo);
            cairo_pattern_destroy(pattern);

            // draw icon
            cairo_set_source_rgb(m_pCairo, 1.f, 1.f, 1.f);
            cairo_move_to(m_pCairo, MONSIZE.x - NOTIFSIZE.x * SECONDRECTPERC + NOTIF_LEFTBAR_SIZE + ICONPADFORNOTIF - 1, offsetY + std::round((NOTIFSIZE.y - iconH - 4) / 2.0));
            pango_cairo_show_layout(m_pCairo, pangoLayout);
        }

        // draw text
        cairo_set_font_size(m_pCairo, FONTSIZE);
        cairo_set_source_rgb(m_pCairo, 1.f, 1.f, 1.f);
        cairo_move_to(m_pCairo, MONSIZE.x - NOTIFSIZE.x * SECONDRECTPERC + NOTIF_LEFTBAR_SIZE + iconW + 2 * ICONPADFORNOTIF, offsetY + FONTSIZE + (FONTSIZE / 10.0));
        cairo_show_text(m_pCairo, notif->text.c_str());

        // adjust offset and move on
        offsetY += NOTIFSIZE.y + 10;

        if (maxWidth < NOTIFSIZE.x)
            maxWidth = NOTIFSIZE.x;
    }

    pango_font_description_free(pangoFD);
    g_object_unref(pangoLayout);

    // cleanup notifs
    std::erase_if(m_dNotifications, [](const auto& notif) { return notif->started.getMillis() > notif->timeMs; });

    return wlr_box{(int)(pMonitor->vecPosition.x + pMonitor->vecSize.x - maxWidth - 20), (int)pMonitor->vecPosition.y, (int)maxWidth + 20, (int)offsetY + 10};
}

void CHyprNotificationOverlay::draw(CMonitor* pMonitor) {

    if (m_pLastMonitor != pMonitor || !m_pCairo || !m_pCairoSurface) {

        if (m_pCairo && m_pCairoSurface) {
            cairo_destroy(m_pCairo);
            cairo_surface_destroy(m_pCairoSurface);
        }

        m_pCairoSurface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, pMonitor->vecPixelSize.x, pMonitor->vecPixelSize.y);
        m_pCairo        = cairo_create(m_pCairoSurface);
        m_pLastMonitor  = pMonitor;
    }

    // Draw the notifications
    if (m_dNotifications.size() == 0)
        return;

    // Render to the monitor

    // clear the pixmap
    cairo_save(m_pCairo);
    cairo_set_operator(m_pCairo, CAIRO_OPERATOR_CLEAR);
    cairo_paint(m_pCairo);
    cairo_restore(m_pCairo);

    cairo_surface_flush(m_pCairoSurface);

    wlr_box damage = drawNotifications(pMonitor);

    g_pHyprRenderer->damageBox(&damage);
    g_pHyprRenderer->damageBox(&m_bLastDamage);

    g_pCompositor->scheduleFrameForMonitor(pMonitor);

    m_bLastDamage = damage;

    // copy the data to an OpenGL texture we have
    const auto DATA = cairo_image_surface_get_data(m_pCairoSurface);
    m_tTexture.allocate();
    glBindTexture(GL_TEXTURE_2D, m_tTexture.m_iTexID);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);

#ifndef GLES2
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_SWIZZLE_R, GL_BLUE);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_SWIZZLE_B, GL_RED);
#endif

    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, pMonitor->vecPixelSize.x, pMonitor->vecPixelSize.y, 0, GL_RGBA, GL_UNSIGNED_BYTE, DATA);

    wlr_box pMonBox = {0, 0, pMonitor->vecPixelSize.x, pMonitor->vecPixelSize.y};
    g_pHyprOpenGL->renderTexture(m_tTexture, &pMonBox, 1.f);
}