#define SAPHIR_CURSOR_PATCH_ADDR &DocRecalc + 0x2c62

U0 saphir_update_cursor()
{
    U16 res = 0xb4;
    res |= ((saphir.cursor.fg & 0xf) << 4 | (saphir.cursor.bg & 0xf)) << 8;
    MemCpy(SAPHIR_CURSOR_PATCH_ADDR, &res, 2);
    MemSet(SAPHIR_CURSOR_PATCH_ADDR + 0x02, 0x90, 3);
}

CDoc* saphir_DocBorder(U64)
{
    U64 addr = Caller;
    if (addr >= &DocEd && addr <= (&DocEd + sizeof(DocEd))) {
        asm {
            MOV RAX, &DocBorder
            ADD RAX, 6
            JMP RAX
        }
    }

    CTask* task = sys_task_being_scrn_updated;
    if (saphir.doc_cursor_state) {
        task->display_doc->flags = saphir.doc_cursor_state;
        saphir.doc_cursor_state = 0;
    }
    task->win_bottom = MinI64(task->win_bottom, TEXT_ROWS - 3);
    if (task != sys_focus_task) {
        return NULL;
    }
    if (ac.task) {
        Kill(ac.task);
        ac.task = NULL;
    }
    saphir_update_cursor;
    gr.dc->color = BLACK;
    GrRect(gr.dc, 0, GR_HEIGHT - 8, GR_WIDTH, 8);
    gr.dc->color = LTGRAY;
    GrPrint(gr.dc, 0, GR_HEIGHT - 8, "[0x%08x] %s", task,
        task->task_title);

    return NULL;
}

U8 saphir_DrvTextAttrGet(U64)
{
    U64 addr = Caller;
    if (addr >= &DrvRep && addr <= (&DrvRep + sizeof(DrvRep))) {
        asm {
            MOV RAX, &DrvTextAttrGet
            ADD RAX, 6
            POP R11
            JMP RAX
        }
    }
    if (addr >= &TaskInit && addr <= (&TaskInit + sizeof(TaskInit))) {
        return NULL;
    }

    if (sys_focus_task == sys_task_being_scrn_updated) {
        return (saphir.border.focus_bg & 0xf) << 4 | (saphir.border.focus_fg & 0xf);
    }
    if (!saphir.doc_cursor_state) {
        saphir.doc_cursor_state = sys_task_being_scrn_updated->display_doc->flags;
        DocCursor(, sys_task_being_scrn_updated->display_doc);
    }
    return (saphir.border.bg & 0xf) << 4 | (saphir.border.fg & 0xf);
}

U0 saphir_cursor(Bool enable)
{
    switch (enable) {
    case 0:
        MemCpy(SAPHIR_CURSOR_PATCH_ADDR, &saphir.cursor.stub, 8);
        return;
    default:
        MemCpy(&saphir.cursor.stub, SAPHIR_CURSOR_PATCH_ADDR, 8);
        saphir_update_cursor;
        return;
    }
}

Bool saphir_Blink(F64 Hz = 2.5)
{
    if (!saphir.blink) {
        return 1;
    }
    if (!Hz)
        return 0;
    return ToI64(cnts.jiffies * 2 * Hz / JIFFY_FREQ) & 1;
}