convertescapetexttopangoattrs.c

PangoAttrList *
convert_escapetext_to_pango_attrlist (char *text, float *fg, float *bg, float *highlight) {
    const int maxTintStops = 100;
    tint_stop_t tintStops[maxTintStops];
    int numTintStops;
    char *plainString;

    numTintStops = calculate_tint_stops_from_string (text, tintStops, maxTintStops, &plainString);

    guint strLength = strlen(plainString);

    strcpy (text, plainString);

    PangoAttrList *lst = pango_attr_list_new ();
    PangoAttribute *attr = NULL;

    // add attributes
    for (guint i = 0; i < numTintStops; i++) {
        int index0 = tintStops[i].index;
        guint len = strLength - index0;

        GdkColor finalColor = { .red = fg[0]*65535, .green = fg[1]*65535, .blue = fg[2]*65535};
        if (tintStops[i].has_rgb) {
            finalColor.red = tintStops[i].r * 65535/255.;
            finalColor.green = tintStops[i].g * 65535/255.;
            finalColor.blue = tintStops[i].b * 65535/255.;
        }

        int tint = tintStops[i].tint;

        if (tint >= 1 && tint <= 3) {
            const float blend[] = {.50f, .25f, 0};
            finalColor.red   = CHANNEL_BLENDR(highlight[0], finalColor.red/65535., blend[tint-1]) * 65535;
            finalColor.green = CHANNEL_BLENDR(highlight[1], finalColor.green/65535., blend[tint-1]) * 65535;
            finalColor.blue  = CHANNEL_BLENDR(highlight[2], finalColor.blue/65535., blend[tint-1]) * 65535;

        } else if (tint >= -3 && tint <= -1) {
            const float blend[] = {.30f, .60f, .80f};
            finalColor.red   = CHANNEL_BLENDR(finalColor.red/65535., bg[0], blend[-tint-1]) * 65535;
            finalColor.green = CHANNEL_BLENDR(finalColor.green/65535., bg[1], blend[-tint-1]) * 65535;
            finalColor.blue  = CHANNEL_BLENDR(finalColor.blue/65535., bg[2], blend[-tint-1]) * 65535;
        }

        attr = pango_attr_foreground_new (finalColor.red, finalColor.green, finalColor.blue);
        attr->start_index = index0;
        attr->end_index = index0 + len;
        pango_attr_list_insert (lst, attr);
    }

    free (plainString);

    return lst;
}