int __guac_terminal_set()

in src/terminal/display.c [106:204]

• 59 lines of code
• 5 McCabe index (conditional complexity)

int __guac_terminal_set(guac_terminal_display* display, int row, int col, int codepoint) {

    int width;

    int bytes;
    char utf8[4];

    /* Use foreground color */
    const guac_terminal_color* color = &display->glyph_foreground;

    /* Use background color */
    const guac_terminal_color* background = &display->glyph_background;

    cairo_surface_t* surface;
    cairo_t* cairo;
    int surface_width, surface_height;
   
    PangoLayout* layout;
    int layout_width, layout_height;
    int ideal_layout_width, ideal_layout_height;

    /* Calculate width in columns */
    width = wcwidth(codepoint);
    if (width < 0)
        width = 1;

    /* Do nothing if glyph is empty */
    if (width == 0)
        return 0;

    /* Convert to UTF-8 */
    bytes = guac_terminal_encode_utf8(codepoint, utf8);

    surface_width = width * display->char_width;
    surface_height = display->char_height;

    ideal_layout_width = surface_width * PANGO_SCALE;
    ideal_layout_height = surface_height * PANGO_SCALE;

    /* Prepare surface */
    surface = cairo_image_surface_create(CAIRO_FORMAT_RGB24,
                                         surface_width, surface_height);
    cairo = cairo_create(surface);

    /* Fill background */
    cairo_set_source_rgb(cairo,
            background->red   / 255.0,
            background->green / 255.0,
            background->blue  / 255.0);

    cairo_rectangle(cairo, 0, 0, surface_width, surface_height); 
    cairo_fill(cairo);

    /* Get layout */
    layout = pango_cairo_create_layout(cairo);
    pango_layout_set_font_description(layout, display->font_desc);
    pango_layout_set_text(layout, utf8, bytes);
    pango_layout_set_alignment(layout, PANGO_ALIGN_CENTER);

    pango_layout_get_size(layout, &layout_width, &layout_height);

    /* If layout bigger than available space, scale it back */
    if (layout_width > ideal_layout_width || layout_height > ideal_layout_height) {

        double scale = fmin(ideal_layout_width  / (double) layout_width,
                            ideal_layout_height / (double) layout_height);

        cairo_scale(cairo, scale, scale);

        /* Update layout to reflect scaled surface */
        pango_layout_set_width(layout, ideal_layout_width / scale);
        pango_layout_set_height(layout, ideal_layout_height / scale);
        pango_cairo_update_layout(cairo, layout);

    }

    /* Draw */
    cairo_set_source_rgb(cairo,
            color->red   / 255.0,
            color->green / 255.0,
            color->blue  / 255.0);

    cairo_move_to(cairo, 0.0, 0.0);
    pango_cairo_show_layout(cairo, layout);

    /* Draw */
    guac_common_surface_draw(display->display_surface,
        display->char_width * col,
        display->char_height * row,
        surface);

    /* Free all */
    g_object_unref(layout);
    cairo_destroy(cairo);
    cairo_surface_destroy(surface);

    return 0;

}